L9500A Introduction Agere Systems Inc. L9500A subscriber line int

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L9500A High-Voltage Ringing SLIC VoIP Applications
L9500A Introduction
Agere Systems Inc. L9500A subscriber line interface circuit that optimized short-loop, power-sensitive applications. This device provides complete line interface functionality (including power ringing) needed interface subscriber loop. This device capability operate with supply designed minimize external components required device interfaces. This device optimized interface data over cable service interface specification (DOCSIS) compliant cable modem gateway, multi-media adaptor, residential gateway products, such Broadcom® BCM3351, BCM3352, BCM6352, BCM1101 equivalent products.
Applications
Interface Broadcom: BCM3351 Cable Modem BCM3352 Cable Modem BCM6352 Integrated Multi-Media Adaptor BCM1101 Residential Gateway Cable Modem Voice over Internet Protocol (VoIP) Voice over Remote Subscriber Units Broadband Wireless Short Loop Access
Features
Description
This device optimized provide battery feed, ringing, supervision short-loop plain telephone service (POTS) loops. This device provides power ring subscriber loop through amplification low-voltage input. provides forward reverse battery feed states, onhook transmission, low-power scan state, ground start (tip open), forward disconnect state. device requires battery operate. either supply. ringing signal derived from high-voltage battery. battery switch included allow lowervoltage battery off-hook mode, thus minimizing short-loop off-hook power. Ring mode overhead collapsed, allowing rail-to-rail operation. this manner, L9500 operate from lower battery minimize critical power consumption same time extend subscriber ringing loop lengths beyond. Loop closure, ring trip, ground start detection available. loop closure detector fixed threshold with hysteresis. ring trip detector requires single-pole filter, thus minimizing external components required. current limit fixed logic-controllable pin. Ground open applied this sets current limit high value. device offered with differential ringing receive input, making ideal direct interface DOCSIS compliant cable modem gateway products.
Differential ringing codec interface Onboard ringing generation Three ringing input options: Sine wave Logic level square wave Flexible options: required Battery switch minimize off-hook power Eight operating states: Scan mode minimal power dissipation Forward reverse battery active On-hook transmission states Ground start Ring mode Disconnect mode Ultralow on-hook power: scan mode active mode Loop start, ring trip, ground start detection Software-controllable dual current limit option 28-pin PLCC package 48-pin MLCC package
L9500A High-Voltage Ringing SLIC VoIP Applications
Table Contents
Contents Page
L9500A Introduction Features Applications.1 Description Features Description.4 Architecture Diagram.6 Information Operating States.9 State Definitions Forward Active Reverse Active Scan On-Hook Transmission-Forward Battery On-Hook Transmission-Reverse Battery Disconnect Ring.10 Ground Start Thermal Shutdown Absolute Maximum Ratings Electrical Characteristics Test Configurations Applications Power Control Loop Current Limit.22 Overhead Voltage Active Mode Scan Mode On-Hook Transmission Mode.22 Ring Mode Loop Range Battery Reversal Rate Supervision Loop Closure.23 Ring Trip Ground Start Power Ring Sine Wave Input Signal Sine Wave Power Ring Signal Output Applications Parameters.25 Design Examples First-Generation Codec Interface Network-Resistive Termination.26 Broadcom 3352 Interface Network. Outline Diagrams.28 28-Pin PLCC 48-Pin MLCC 48-Pin MLCC, JEDEC MO-220 VKKD-2.30 Ordering Information
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Table Contents
Figures Page
Figure Architecture Diagram Figure 28-pin PLCC Diagram Figure 48-pin Diagram Figure Basic Test Circuit Figure Metallic PSRR Figure Longitudinal PSRR Figure Longitudinal Balance Figure Gains Figure Ringing Waveform Crest Factor Figure Ringing Waveform Crest Factor Figure RINGIN Operation Figure Reference Schematic with Broadcom Embedded Codec Devices Agere L9500 SLIC
Tables
Page
Table Descriptions Table Control States Table Supervision Coding Table Recommended Operating Characteristics Table Thermal Characteristics Table Environmental Table Supply Currents Table Powering Table Supply Currents Table Powering Table 2-Wire Port Table Analog Characteristics Table Feed Characteristics Table Logic Inputs Outputs (VCC Table Logic Inputs Outputs (VCC Table Ground Start Table Ringing Specifications Table Ring Trip Table Typical Active Mode Off-Hook Tip/Ring Current-Limit Transient Response Table Values Typical Ramp Time Table Parts List L9500; Agere L9500 Broadcom BCM3352 (per Broadcom BCM93552SV Application Board-SLIC Daughter Boad Components); Fully Programmable
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Features
board balanced ringing generation: ring relay bulk ring generator required ring frequency supported Sine wave input-sine wave output input-sine wave output Square wave input-trapezoidal output Power supplies requirements: talk battery ringing battery required supply required high-voltage positive supply required Flexible options: operation interchangeable transparent users Battery switch logic control: Minimize off-hook power dissipation Minimal external components required Eight operating states: Forward active, BAT2 applied Polarity reversal active, VBAT2 applied On-hook transmission, VBAT1 applied On-hook transmission polarity reversal, BAT1 applied Ground start Scan Forward disconnect Ring mode Unlatched parallel data control interface Ultralow SLIC power: Scan (VCC Forward/reverse active (VCC Scan (VCC Forward/reverse active (VCC Supervision: Loop start, fixed threshold with hysteresis Ring trip, single-pole ring trip filtering, fixed threshold function battery voltage Ground start fixed threshold with hysteresis
Adjustable current limit: ground open control input Overhead voltage: Clamped typically differentially Clamped maximum <56.5 single-ended Thermal shutdown protection with hysteresis Device interfaces: Differential receive interface Singled-ended transmit interface Differential ring input Package options: 28-pin PLCC 48-pin MLCC CBIC-S technology
Description
L9500 designed provide battery feed, ringing, supervision functions short plain telephone service (POTS) loops. This device designed ultralow power operating states. L9500 offers operating states. device assumes lower-voltage talk battery, highervoltage ringing battery, supply. L9500 requires only positive supply. supply needed. L9500 operate with either allowing greater user flexibility. choice voltage transparent user; device will function with either supply voltage connected. batteries used: high-voltage ring battery BAT1). VBAT1 maximum VBAT1 used power ring signal amplification scan, on-hook transmission, ground start modes. This supply current limited approximately maximum power ringing current, typically lower-voltage talk battery (VBAT2). VBAT2 used active mode powering.
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Both ring trip loop closure supervision functions included. loop closure fixed typical 10.5 off-hook threshold active mode fixed 11.5 off-hook threshold from scan mode. either case, there hysteresis. ring trip detector requires only single-pole filter input, minimizing external components. ring trip threshold given battery voltage fixed. Typical ring trip threshold 42.5 BAT1. device offers ground start mode. this mode drive amplifier turned off. device presents high impedance (>100 current limited battery (VBAT1) VBAT1 clamped less than 56.5 this mode NSTAT loop current detctor used ring ground detection. ground start mode, since loop current common mode, loop closure threshold reduced half, thus maintaining loop supervision specified levels. Upon reaching thermal shutdown temperature, device will enter mode. Upon cooling, device will re-enter state prior thermal shutdown. Hysteresis built prevent oscillation. Data control parallel unlatched control scheme. current limit fixed either depending ground open applied VPROG current limit programming pin. Programming accuracy ±8%. Circuitry added L9500 minimize inrush current from supply battery supply during off-hook transition, thus saving power supply design cost. Applications section this data sheet more information. L9500 uses voltage feed-current sense architecture; thus transmit gain transconductance. L9500 transconductance single external resistor, this device designed optimal performance with transconductance V/A. This interface single ended. L9500 offers differential receive interface with gain L9500 internally referenced This reference voltage output VREF output device. SLIC output VITR also referenced SLIC inputs RCVP/RCVN floating inputs. L9500 packaged 28-pin PLCC 48-pin MLCC package.
Description (continued)
Forward reverse battery active modes used off-hook conditions. Since this device designed short-loop applications, lower-voltage VBAT2 applied during forward reverse active states. Battery reversal quiet, without breaking path. Rate battery reversal ramped control switching time. magnitude overhead voltage forward reverse active modes typical default value allowing on-hook transmission undistorted signal 3.14 into Additionally, this allows sufficient overhead meter pulse desired. This overhead fixed. ring trip detector turned during active modes conserve power. Because on-hook transmission allowed scan mode, on-hook transmission mode defined. This mode functionally similar active mode, except ring voltage derived from higher VBAT1 rather than VBAT2. on-hook transmission modes with primary battery whose magnitude greater than nominal magnitude tip-to-ground ring-toground voltage clamped less than 56.5 minimize on-hook power, low-power scan mode available. this mode, functions except off-hook supervision turned conserve power. On-hook transmission allowed scan mode. scan mode with primary battery whose magnitude greater than nominal magnitude tip-to-ground ring-to-ground voltage clamped less than 56.5 forward disconnect mode provided, where circuits turned power denied loop. device offers ring mode, which power ring signal provided tip/ring pair. During ring mode, user-supplied, low-voltage ring signal differentially input device's RINGIN input. This signal amplified produce power ring signal. This signal sine wave filtered square wave produce sine wave trapezoidal output. Ring trip detector common-mode current detector active during ring mode. With maximum VBAT1 sine wave input, L9500 sufficient power ring (1386 ringing load into physical resistance. This feature eliminates need separate external ring relay, associated external circuitry, bulk ringing generator. Applications section this data sheet more information. Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Architecture Diagram
AGND
BGND VBAT2
VBAT1
VPROG
NSTAT
RTFLT
DCOUT
VREF VITR POWER
CURRENT LIMIT INRUSH CONTROL
RING TRIP
LOOP CLOSURE (ITR/306) VREF BAND-GAP REFERENCE VITR RECTIFIER
GAIN RCVN RCVP VREG
TIP/RING CURRENT SENSE
VREG
INTERFACE
GAIN
RINGING
PARALLEL DATA INTERFACE
RINGINN RINGINP
12-3530.F
Figure Architecture Diagram
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Information
NSTAT RCVN RCVP VITR
RINGINN
RINGINP
DCOUT
L9500 28-PIN PLCC PINOUT
RTFLT
VREF
AGND VBAT1 VBAT2 BGND VPROG
12-3558e
Figure 28-pin PLCC Diagram
RCVP
NSTAT
RCVN
VITR
RINGINN RINGINP DCOUT RTFLT
L9500 48-PIN MLCC PINOUT
VPROG
VBAT1 AGND VBAT2 VREF
BGND
12-3361.b
Figure 48-pin Diagram Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Information (continued)
Table Descriptions 28-Pin PLCC 48-Pin MLCC Symbol NSTAT Type Name/Function
VITR
RCVP
RCVN
RINGINN
RINGINP
DCOUT
RTFLT
VREF AGND VBAT1 VBAT2 BGND
Loop Closure Detector Output-Ring Trip Detector Output. When low, this logic output indicates that off-hook condition exists ringing tripped ring ground occurred. Transmit Output Voltage. Output internal amplifier. This output voltage that directly proportional differential tip/ring current. Receive Signal Input (Noninverting). This high-impedance input controls differential voltage ring. This node floating input. Receive Signal Input (Inverting). This high-impedance input controls differential voltage ring. This node floating input. Power Ring Signal Input. Couple sine wave lower crest factor low-voltage ring signal. input here amplified provide full power ring signal ring. This signal applied continuously, even during nonringing states. Power Ring Signal Input. Couple sine wave lower crest factor low-voltage ring signal. input here amplified provide full power ring signal ring. This signal applied continuously, even during nonringing states. Output Voltage. This output voltage that directly proportional absolute value differential tip/ring current. This used ring trip threshold. Filter Capacitor. Connect capacitor from this node ground. Filter Capacitor. Connect capacitor from this node CF2. Ring Trip Filter. Connect this lead DCOUT resistor AGND with capacitor filter ring trip circuit prevent spurious responses. single-pole filter needed. SLIC Internal Reference Voltage. Output internal reference voltage. Analog Signal Ground. Analog Power Supply. User choice nominal power supply. Battery Supply High-voltage battery. Battery Supply Lower-voltage battery. Battery Ground. Ground return battery supplies. Connection.
VPROG
Current-Limit Program Input. Connect ground this current limit leave this open current limit
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Information (continued)
Table Descriptions (continued) 28-Pin PLCC 48-Pin MLCC Symbol Type Name/Function Polarity Reversal Slowdown Capacitor. Connect capacitor from this node controlling rate battery reversal. ramped battery reversal desired, this left open. Polarity Reversal Slowdown Capacitor. Connect capacitor from this node controlling rate battery reversal. ramped battery reversal desired, this left open. Protected Tip. output drive amplifier input loop sensing circuit. Connect loop through overvoltage overcurrent protection. Protected Ring. output drive ring amplifier input loop sensing circuit. Connect loop through overvoltage overcurrent protection. State Control Input. These pins have internal pull-up. State Control Input. These pins have internal pull-up. State Control Input. These pins have internal pull-up. Transmit Gain. Input amplifier. Connect 4.75 resistor from this node transmit gain. Gain shaping termination impedance with first generation codec also achieved with network from this node VTX. Output Voltage. Output internal amplifier. voltage this directly proportional differential tip/ring current. ac/dc Separation. Input internal amplifier. Connect capacitor from this VTX.
Operating States
Table Control States State Forward active Reverse active On-hook transmission forward battery On-hook transmission reverse battery Ground start Scan Disconnect-device will power this state Ring
Table Supervision Coding NSTAT off-hook ring trip thermal shutdown ring ground. on-hook ring trip thermal shutdown ring ground.
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
State Definitions
Forward Active
On-Hook Transmission-Reverse Battery
positive with respect VBAT1 applied tip/ring drive amplifiers. Supervision circuits, loop closure, commonmode detect active. Ring trip detector turned conserve power. On-hook transmission allowed. tip-to-ring on-hook differential voltage will typically between with primary battery.
positive with respect
VBAT2 applied tip/ring drive amplifiers. Loop closure common-mode detect active. Ring trip detector turned conserve power. Overhead nominal undistorted transmission 3.14 into
Reverse Active Disconnect
positive with respect VBAT2 applied tip/ring drive amplifiers. Loop closure common-mode detect active. Ring trip detector turned conserve power. Overhead nominal undistorted transmission 3.14 into
tip/ring amplifiers supervision turned off. SLIC goes into high-impedance state. NSTAT forced high (on-hook). Device will power this state.
Scan
Ring
Except loop closure, circuits (including ring trip common-mode detector) powered down. On-hook transmission disabled. positive with respect VBAT1 applied tip/ring. ring on-hook differential voltage will typically between with primary battery.
Power ring signal applied ring. Input waveform RINGIN amplified. Ring trip supervision common-mode current supervision active; loop closure inactive. Overhead voltage reduced typically Current limited saturation current amplifiers themselves, typically
On-Hook Transmission-Forward Battery
Ground Start
drive amplifer turned off. Device presents high impedance (>100 Device presents clamped (<56.5 current-limited battery (VBAT1) Output RGDET indicates current flowing ring lead.
positive with respect
VBAT1 applied tip/ring drive amplifiers. Supervision circuits, loop closure, commonmode detect active. Ring trip detector turned conserve power. On-hook transmission allowed. tip-to-ring on-hook differential voltage will typically between with primary battery.
Thermal Shutdown
controlled truth table inputs. This mode caused excessive heating device, such encountered extended power-cross situation. NSTAT output forced hook during thermal shutdown event. Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Absolute Maximum Ratings
Stresses excess absolute maximum ratings cause permanent damage device. These absolute stress ratings only. Functional operation device implied these other conditions excess those given operational sections data sheet. Exposure absolute maximum ratings extended periods adversely affect device reliability. Parameter Supply (VCC) Battery Supply (VBAT1) Battery Supply (VBAT2) Logic Input Voltage Logic Output Voltage Operating Temperature Range Storage Temperature Range Relative Humidity Range Fault Voltage (dc) Fault Voltage 1000 Ground Potential Difference (BGND AGND) Symbol VPT, VPT, -0.5 -0.5 -0.5 VBAT VBAT VBAT1 Unit
Note: damaged unless ground connections applied before, removed after, other connections. Furthermore, when powering device, user must guarantee that external potential creates voltage device that exceeds device ratings. example, inductance supply lead could resonate with supply filter capacitor cause destructive overvoltage.
Table Recommended Operating Characteristics Parameter Supplies (VCC) Supplies (VCC) High Office Battery Supply (VBAT1) Auxiliary Office Battery Supply (VBAT2) Operating Temperature Range Table Thermal Characteristics Parameter Thermal Protection Shutdown (Tjc) PLCC Thermal Resistance Junction Ambient (JA)1, Natural Convection 2S2P Board Natural Convection 2S0P Board Wind Tunnel Linear Feet Minute (LFPM) 2S2P Board Wind Tunnel Linear Feet Minute (LFPM) 2S0P Board Thermal Resistance Junction Ambient (JA)1, 35.5 50.5 31.5 42.5 Unit °C/W °C/W °C/W °C/W °C/W 3.13 5.25 VBAT1 Unit
This parameter tested production. guaranteed design device characterization. Airflow, board layers, other factors greatly affect this parameter.
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Electrical Characteristics
Table Environmental Parameter Temperature Range Humidity Range1
exceed grams water kilogram air.
Unit
Table Supply Currents VBAT1 VBAT2 Parameter Supply Currents (scan state; loop current): IVCC IVBAT1 IVBAT2 Supply Currents (forward/reverse active; loop current, with without PPM, VBAT2 applied): IVCC IVBAT1 IVBAT2 Supply Currents (on-hook transmission mode; loop current, with without PPM, VBAT1 applied): IVCC IVBAT1 IVBAT2 Supply Currents (disconnect mode): IVCC IVBAT1 IVBAT2 Supply Currents (ground start mode, loop current): IVCC IVBAT1 IVBAT2 Supply Currents (ring mode; load): IVCC IVBAT1 IVBAT2 Table Powering VBAT1 VBAT2 Parameter Power Dissipation (scan state; loop current) Power Dissipation (forward/reverse active; loop current, VBAT2 applied) Power Dissipation (on-hook transmission mode; loop current, BAT1 applied) Power Dissipation (disconnect mode) Power Dissipation (ground start mode) Power Dissipation (ring mode; load) Unit 4.30 0.24 4.80 0.35 Unit
5.95
1.40
0.24
3.75
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Electrical Characteristics (continued)
Table Supply Currents VBAT1 VBAT2 Parameter Supply Currents (scan state; loop current): IVCC IVBAT1 IVBAT2 Supply Currents (forward/reverse active; loop current, VBAT2 applied): IVCC IVBAT1 IVBAT2 Supply Currents (on-hook transmission mode; loop current, VBAT1 applied): IVCC IVBAT1 IVBAT2 Supply Currents (disconnect mode): IVCC IVBAT1 IVBAT2 Supply Currents (ground start mode, loop current): IVCC IVBAT1 IVBAT2 Supply Currents (ring mode; load): IVCC IVBAT1 IVBAT2 Table Powering VBAT1 VBAT2 Parameter Power Dissipation (scan state; loop current) Power Dissipation (forward/reverse active; loop current, VBAT2 applied) Power Dissipation (on-hook transmission mode; loop current, BAT1 applied) Power Dissipation (disconnect mode) Power Dissipation (ground start mode) Power Dissipation (ring mode; loop current) 36.5 Unit 0.24 0.24 4.70 0.35 Unit
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Electrical Characteristics (continued)
Table 2-Wire Port Parameter Ring Drive Current Longitudinal Signal Currents Ring Drive Current Ringing Longitudinal Signal Current Longitudinal Current Capability Wire (Longitudinal current independent loop current.) Ringing Current (RLOAD 1386 Ringing Current Limit (RLOAD Loop Current-ILIM (VBAT2 applied, RLOOP VPROG VPROG Open Current Variation Feed Resistance (does include protection resistors) Open Loop Voltages: Scan Mode: |VBAT1| |VTIP| |VRING| Battery Ground Battery Ground Mode: |VBAT1| |VTIP| |VRING| Battery Ground Battery Ground Active Mode: |VBAT2| Ring Mode: |VBAT1| Unit mArms mArms mArms
5.75
6.25
56.5 56.5 56.5 56.5 7.75
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Electrical Characteristics (continued)
Table 2-Wire Port (continued) Parameter Loop Closure Threshold: Active/On-hook Transmission Modes Scan Mode Loop Closure Threshold Hysteresis: Longitudinal Metallic Balance PT/PR Test Method: Q552 (11/96) Section 2.1.2 IEEE® 455: Metallic Longitudinal (harm) Balance: 1000 4000 PSRR Hz-3000 VBAT1, VBAT2 operation) Table Analog Characteristics Parameter (input impedance) Output Offset (VTX) Output Offset (VITR) Output Drive Current (VTX) Output Drive Current (VITR) Output Voltage Swing: Maximum (VTX, VITR) Minimum (VTX) Minimum (VITR) Output Short-circuit Current Output Load Resistance Output Load Capacitance RCVN RCVP: Input Voltage Range (VCC Input Voltage Range (VCC Input Bias Current Differential PT/PR Current Sense (DCOUT): Gain (PT/PR DCOUT) Offset Voltage ILOOP ±300 AGND AGND 0.25 AGND 0.35 0.05 Unit 10.5 11.5 Unit
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Electrical Characteristics (continued)
Table Feed Characteristics Parameter Termination Impedance Total Harmonic Distortion (200 Hz-4 kHz) Off-hook On-hook Transmit Gain 1004 1020 Hz)3: PT/PR Current VITR Receive Gain, 1004 1020 Open Loop RCVP RCVN PT-PR Gain Frequency (transmit receive)2 Termination, 1004 1020 reference: Hz-300 Hz-3.4 kHz-20 kHz-266 Gain Level (transmit receive)2 Reference: +3.0 Idle-channel Noise (tip/ring) Termination: Psophometric C-Message Flat Idle-channel Noise (VTX) Termination: Psophometric C-Message Flat
7.76
1400 8.24
Unit
-0.3 -0.05 -3.0 -0.05
0.05 0.05 0.05 0.05
dBmp dBrnC dBrn dBmp dBrnC dBrn
externally either discrete external components third- fourth-generation codec. complex impedance between 1400 synthesized. This parameter tested production. guaranteed design device characterization. VITR transconductance depends resistor from VITR. This gain assumes ideal 4750 recommended value. Positive current defined differential current flowing from
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Electrical Characteristics (continued)
Table Logic Inputs Outputs (VCC Parameter Input Voltages: Level High Level Input Current: Level (VCC 5.25 High Level (VCC 5.25 Output Voltages (open collector with internal pull-up resistor): Level (VCC 4.75 High Level (VCC 4.75 Table Logic Inputs Outputs (VCC Parameter Input Voltages: Level High Level Input Current: Level (VCC 3.46 High Level (VCC 3.46 Output Voltages (open collector with internal pull-up resistor): Level (VCC 3.13 High Level (VCC 3.13 Table Ground Start Parameter Open Mode-Tip Input Impedance Threshold Hysteresis: Unit Symbol -0.5 Unit Symbol -0.5 ±100 Unit
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Electrical Characteristics (continued)
Table Ringing Specifications Parameter RINGINN/P: Input Voltage Swing Input Impedance Ring Signal Isolation: PT/PR Ring Mode Ring Signal Isolation: RINGIN PT/PR Nonring Mode Ring Signal Distortion: 1380 Load, Loop Differential Gain: RINGINN/P PT/PR-VRINGINN/P VBAT1 LOAD 1400 Table Ring Trip Parameter Ring Trip (NSTAT Loop Resistance (total) VBAT1 applied Ring Trip (NSTAT Loop Resistance (total) VBAT1 applied Trip Time Hysteresis Ringing will tripped following loads:
Unit
Unit
resistor parallel with capacitor applied across ring. Ring frequency resistor series with capacitor applied across ring. Ring frequency
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Test Configurations
RTFLT DCOUT RLOOP /600 RING
RINGINN
RINGIN
RINGINP
RINGIN 26.7
RCVP RCVN
60.4 69.8
VITR
VITR
VPROG VREF
L9500 BASIC TEST CIRCUIT
4750
VBAT2 VBAT1 BGND AGND NSTAT
VBAT2 VBAT1
Figure Basic Test Circuit
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Test Configurations (continued)
VBAT VBAT DISCONNECT BYPASS CAPACITOR
BASIC TEST CIRCUIT RING
VT/R
BASIC TEST CIRCUIT
LONGITUDINAL BALANCE 20log
12-2584.c
RING
Figure Longitudinal Balance
VT/R
12-2582.c
PSRR 20log
Figure Metallic PSRR
67.5 67.5 56.3 PSRR 20log
12-2583.b
VITR
VT/R BASIC TEST CIRCUIT
DISCONNECT BYPASS CAPACITOR
GXMT GRCV
VXMT VT/R VRCV
12-2587.G
BASIC TEST CIRCUIT
Figure Gains
RING
Figure Longitudinal PSRR
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Thus, total power dissipated SLIC less than 1.83 will enter thermal shutdown state. Total SLIC power calculated Total maximum battery maximum current limit SLIC quiescent power. L9500A, worst-case SLIC on-hook active power Thus, Total off-hook power (ILOOP)(current-limit tolerance) (VBATAPPLIED) SLIC on-hook power Total off-hook power (0.030 A)(1.08) (21) Total off-hook power 744.4 power dissipated SLIC total power dissipation less power that dissipated loop. SLIC Total power loop power Loop off-hook power (ILOOP 1.08)2 (RLOOP(dc) 2RPROTECTION RHANDSET) Loop off-hook power ((0.030 A)(1.08))2 Loop off-hook power 293.9 SLIC off-hook power Total off-hook power loop off-hook power SLIC off-hook power 744.4 293.9 SLIC off-hook power 450.5 1.83 Thus, under worst-case normal operating conditions this example, thermal design, using auxiliary, adequate ensure device driven into thermal shutdown under worst-case operating conditions.
Applications
Power Control
Under normal device operating conditions, power dissipation device must controlled prevent device temperature from rising above thermal shutdown causing device shut down. Power dissipation highest with higher battery voltages, higher current limit, under shorter loop conditions. Additionally, higher ambient temperature will also reduce thermal margin. support required power ringing voltages, this device meant operate with high-voltage primary battery (-65 typically). Thus, power control normally achieved battery switch auxiliary lower absolute voltage battery. Operating temperature range, maximum current limit, maximum battery voltage, minimum loop length protection resistors values, airflow, number board layers will influence overall thermal performance. following example illustrates typical thermal design considerations. thermal resistance 28-pin PLCC package typically 35.5 °C/W, which representative natural airflow seen typical switch cabinet with multilayer board. L9500 will enter thermal shutdown typical temperature 150°C. thermal design should ensure that SLIC does reach this temperature under normal operating conditions. this example, assume maximum ambient operating temperature designed current limit maximum battery auxiliary battery Assume (worst-case) minimum loop wire resistance, protection resistors, handset. Additionally, include effects parameter tolerance. TTSD TAMBIENT(max) allowed thermal rise. 150°C Allowed thermal rise package thermal impedance SLIC power dissipation. 35.5°C/W SLIC power dissipation SLIC power dissipation (PD) 1.83
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Applications (continued)
Loop Current Limit
Current limit chosen from discrete values, depending VPROG grounded left floating mA). Note that there 12.5 slope characteristic currentlimit region; thus, once current limit, actual loop current will increase slightly, loop length decreases. above describes active mode steady-state current-limit response. There will transient response current-limit circuit upon off-hook transition. Typical active mode transient current-limit response given Table Table Typical Active Mode Off-Hook Tip/ Ring Current-Limit Transient Response Parameter Loop Current: Active Mode RLOOP Off-hook Transition Loop Current: Active Mode RLOOP Off-hook Transition Loop Current: Active Mode RLOOP Off-hook Transition Value ILIM Unit
On-Hook Transmission Mode magnitude primary battery greater than magnitude open loop tip-to-ring open loop voltage clamped typically between magnitude primary battery less than nominal overhead voltage will track magnitude battery voltage, i.e., magnitude open circuit tip-to-ring voltage will less than battery. scan mode, overhead unaffected VOVH. Ring Mode ring mode, maximize ringing loop length, overhead decreased saturation ring drive amplifiers, nominal ground voltage ring VBAT1 voltage ring mode, overhead unaffected VOVH. During ring mode, conserve power, receive input RCVN/RCVP deactivated. During ring mode, conserve power, amplifier transmit direction VITR deactivated. However, amplifier active during ring mode; differential ring current sensed during ring mode.
ILIM
Loop Range
ILIM loop range calculated using:
BAT2 LIMI
Overhead Voltage
Active Mode Overhead fixed nominal which adequate on-hook transmission 3.14 into with additional head room signal. Scan Mode magnitude primary battery greater than magnitude open loop tip-to-ring open loop voltage clamped typically between magnitude primary battery less than nominal overhead voltage will track magnitude battery voltage, i.e., magnitude open circuit tip-to-ring voltage will less than battery. scan mode, overhead unaffected VOVH.
VBAT2 typically applied under off-hook conditions power conservation SLIC thermal considerations. L9500 intended short-loop applications and, therefore, will always current limit during off-hook conditions. However, note that ringing loop length rather than loop length will factor determine operating loop length.
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Loop Closure
loop closure fixed typical 10.5 offhook threshold active mode fixed 11.5 off-hook threshold from scan mode. either case, there hysteresis with hysteresis with
Applications (continued)
Battery Reversal Rate
rate battery reverse controlled ramped capacitors FB2. chart showing values typical ramp time given below. Leave open desired ramp rate battery reversal. Table Values Typical Ramp Time CFB1 CFB2 0.01 0.22 0.47 1.22 Transition Time 2.25
Ring Trip
ring trip detector requires only single-pole filter input, minimizing external components. combination filter pole 5.15 recommended. ring trip threshold internally fixed function battery voltage given (mA) {(0.0045 VBAT1) 0.317} where: ring trip current VBAT1 magnitude ring battery There hysteresis.
Supervision Ground Start
L9500 offers loop closure ring trip supervision functions. Internal device, outputs these detectors multiplexed into single package output (NSTAT). ring trip detector valid NSTAT during ring mode loop closure detector valid NSTAT during active on-hook transmission modes. Additionally, common-mode current detected ground start applications. This status output onto NSTAT valid during ground start mode. ground start applications, loop closure detector detector also used indicate that ring-ground occurred. During ground start mode, loop current will common mode, rather than differential loop start mode. Thus, ground start threshold loop closure detector reduced half threshold seen loop start mode.This ouput seen NSTAT output pin.
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Applications (continued)
Power Ring
device offers ring mode, which balanced power ring signal provided tip/ring pair. During ring mode, user-supplied low-voltage ring signal input device's RINGIN input. This signal amplified produce balanced power ring signal. user supply sine wave input, input, square wave produce sinusoidal trapezoidal ringing ring. Various crest factors shown below illustrative purposes.
VOLTS 0.00 0.04 0.08 0.12 0.16 0.20 0.02 0.06 0.10 0.14 0.18 TIME
12-3346a
Sine Wave Input Signal Sine Wave Power Ring Signal Output low-voltage sine wave input applied differentially single ended L9500 pins RINGINP RINGINN. During ring mode, signals pins RINGINP RINGINN amplified presented subscriber loop. differential gain from RING ring nominal When device enters ring mode, tip/ring overhead scan clamp circuit disabled, allowing voltage magnitude power ring signal maximized. Additionally, ring mode, loop current limit increased 2.5X value VPROG voltage. magnitude power ring voltage will function gain ring amplifier, high-voltage battery, input signal RING input range signal RINGIN Vcc. input voltage RINGIN increased, magnitude power ring voltage ring will increase linearly, gain until ring drive amplifiers begin saturate. Once ring amplifiers reach saturation, further increases input signal will cause clipping distortion power ring signal ring. ring signal will appear balanced ring. That power ring signal applied both ring, with signal 180° phase from signal ring. recommended that input level RING adjusted that power ring signal ring just edge slightly clipping. This gives maximum power transfer with minimal distortion sine wave. side will saturate nominal above ground. ring side will saturate nominal above battery. input circuit sine wave along with waveforms illustrate ring saturation shown Figure point which clipping power ring signal begins ring function battery voltage, input capacitor RINGIN, input signal RINGIN Vcc. During nonring modes, sinusoidal ringing waveform left RINGIN. state table, ring signal will removed from ring even low-voltage input still present RINGIN.
Note: Slew rate 5.65 V/ms; trise tfall pwidth period
Figure Ringing Waveform Crest Factor
VOLTS 0.00 0.04 0.08 0.12 0.16 0.20 0.02 0.06 0.10 0.14 0.18 TIME
12-3347a
Note: Slew rate 10.83 V/ms; trise tfall pwidth period
Figure Ringing Waveform Crest Factor
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Applications (continued)
L9500
VTIP VBAT VRING
RINGINP RINGINN
VBAT
Figure RINGIN Operation
Applications
Parameters
There four design parameters. Termination impedance impedance looking into 2-wire port line card. match impedance telephone loop order minimize echo return telephone set. Transmit gain measured from 2-wire port highway, while receive gain done from highway transmit port. Transmit receive gains specified terms actual gain, terms transmission level point (TLP), that actual transmission level dBm. Finally, hybrid balance network cancels unwanted amount receive signal that appears CODEC input.
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Applications (continued)
Design Examples
Broadcom 3352 Interface Network
following reference circuit shows complete SLIC schematic interface Broadcom BCM3352 designed Broadcom BCM93352SV application reference design board.
VBAT1 CBAT1 DBAT1 VBAT2 CBAT2 VBAT2 AGND VDDCORE CMLEVEL RTFLT VREF_IO
FERRITE BEAD
VBAT1
BGND
VDDI/O
DCOUT FUSIBLE VBAT1 AGERE L7591 FUSIBLE 78.7 VPROG 0.47 4750 RINGINN RINGINP 0.22 NSTAT RCVN VREF 54.9
88.7
VTXP
VITR
VTXN
L9500
88.7
RCVP
BROADCOM BCM3351 BCM3352 VRXP BCM6352 BCM1101
VRXN
RING REFN
RING REFP
RDET
Figure Reference Schematic with Broadcom Embedded Codec Devices Agere L9500 SLIC
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Applications (continued)
Design Examples (continued)
Table Parts List L9500; Agere L9500 Broadcom BCM3352 (per Broadcom BCM93552SV Application Board-SLIC Daughter Boad Components); Fully Programmable Name Value Fault Protection Protector Agere L7591 Power Supply CBAT1 CBAT2 DBAT1 1N4004 0.47 Ferrite Murata® Bead BLM11A601SPB 0.22 Ring Trip Interface 4750 0.47 78.7 88.7 54.9 88.7 RDET Tolerance Rating Function
Fusible Protection resistor. Fusible Protection resistor. Secondary protection. 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 VBAT filter capacitor. VBAT filter capacitor. |VBAT2| |VBAT1|. Reverse current. Ceramic bypass capacitor. Filtering. Filter capacitor. Filter capacitor. Ring trip filter capacitor. Ring trip filter resistor. Sets VITR transconductance. ac/dc separation. blocking capacitor. interface. interface. interface. interface. interface. Control.
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Outline Diagrams
28-Pin PLCC
Dimensions millimeters.
12.446 0.127 11.506 0.076 IDENTIFIER ZONE
11.506 0.076 12.446 0.127
4.572 SEATING PLANE 1.27 0.51 0.330/0.533
5-2506r.8(F)
0.10
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Outline Diagrams (continued)
48-Pin MLCC
Dimensions millimeters. Notes: dimensions this outline diagram intended informational purposes only. detailed schematics assist your design efforts, please contact your Agere Sales Representative. exposed bottom package will VBAT1 potential.
7.00 3.50 6.75 3.375 0.50
DETAIL VIEW EVEN TERMINAL/SIDE 6.75 7.00 0.18/0.30
IDENTIFIER ZONE
0.00/0.05 SECTION DETAIL SEATING PLANE 0.20 SPACES 0.50 5.50 0.24/0.60 0.18/0.30 0.08 0.01/0.05 0.65/0.80 1.00
0.24/0.60
5.10 0.15
0.30/0.45 EXPOSED 0.50
0195mod
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Outline Diagrams (continued)
48-Pin MLCC, JEDEC MO-220 VKKD-2
Dimensions millimeters. Notes: dimensions this outline diagram intended informational purposes only. detailed schematics assist your design efforts, please contact your Agere Sales Representative. exposed bottom package will VBAT1 potential.
7.00 3.50 IDENTIFIER ZONE
0.50 3.50 INDEX AREA (7.00/2 7.00/2) 7.00 DETAIL VIEW EVEN TERMINAL/SIDE
0.18
0.23
VIEW
1.00 SEATING PLANE 0.20 0.08 0.02/0.05 DETAIL 0.23
0.18
SIDE VIEW
SPACES 0.50 5.50 DETAIL 0.18/0.30
0.30/0.50
2.50/2.625 5.00/5.25
EXPOSED 0.50 DETAIL
BOTTOM VIEW
0195a
Agere Systems Inc.
L9500A High-Voltage Ringing SLIC VoIP Applications
Ordering Information
Device Part Number LUCL9500AGF-D LUCL9500AGF-DT LUCL9500ARG-D Description SLIC SLIC SLIC Package 28-Pin PLCC, dry-bagged 28-Pin PLCC, dry-bagged, tape reel 48-Pin MLF, dry-bagged Comcode 108955501 108955519 108955485
Agere Systems Inc.
Broadcom registered trademark Broadcom Corporation. IEEE registered trademark Institute Electrical Electronics Engineers, Inc. Murata registered trademark Murata Manufacturing Company LTD.
additional information, contact your Agere Systems Account Manager following: INTERNET: http://www.agere.com E-MAIL: docmaster@agere.com AMERICA: Agere Systems Inc., Union Boulevard, Room 30L-15P-BA, Allentown, 18109-3286 1-800-372-2447, 610-712-4106 CANADA: 1-800-553-2448, 610-712-4106) ASIA: Agere Systems Hong Kong Ltd., Suites 3201 3210-12, 32/F, Tower Gateway, Harbour City, Kowloon Tel. (852) 3129-2000, (852) 3129-2020 CHINA: (86) 21-5047-1212 (Shanghai), (86) 10-6522-5566 (Beijing), (86) 755-695-7224 (Shenzhen) JAPAN: (81) 3-5421-1600 (Tokyo), KOREA: (82) 2-767-1850 (Seoul), SINGAPORE: (65) 778-8833, TAIWAN: (886) 2-2725-5858 (Taipei) EUROPE: Tel. (44) 7000 624624, (44) 1344
Agere Systems Inc. reserves right make changes product(s) information contained herein without notice. liability assumed result their application.
Copyright 2001 Agere Systems Inc. Rights Reserved
September 2001 DS01-303ALC (Replaces DS01-081ALC)

L9500A Introduction Agere Systems Inc. L9500A subscriber line int

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