High-Voltage Ringing SLIC Device VolP Applications VE950 Series I

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High-Voltage Ringing SLIC Device VolP Applications VE950 Series I

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Le9500
High-Voltage Ringing SLIC Device VolP Applications VE950 Series
Interface Broadcom: BCM3367/3368 cable modem BCM3341/3351/3352 cable modem BCM6352 integrated multimedia adaptor BCM1101 residential gateway Cable modems Voice over Internet Protocol (VoIP) Voice over Remote subscriber units Broadband wireless Short-loop access
ORDERING INFORMATION
Device Le9500ABJC Le9500BBJC Le9500CBJC Le9500DBJC Package Type1 28-Pin PLCC, -75V (Green) 28-Pin PLCC, -85V (Green) 28-Pin PLCC, -100V (Green) 28-Pin PLCC, -100V operation -145V ringing (Green) Tube Packing2
green package meets RoHS Directive 2002/95/EC European Council minimize environmental impact electrical equipment. delivery using tape reel packing system, suffix (Ordering Part Number) when placing order.
FEATURES
Differential ringing codec interface Single-ended application also supported On-board ringing generation ring frequency supported Three ringing options: Sine wave input sine wave output input sine wave output Square wave input trapezoidal output Flexible power supply options: VBAT2 active talking VBAT1 ringing, scan, Battery switch minimize off-hook power Eight operating states: Scan Forward reverse battery active Forward reverse battery on-hook transmission Ground start Ring Disconnect Ultra-low on-hook power: scan state active state Loop start, ring trip, ground start detection Fixed hook threshold with hysteresis Fixed ground start threshold with hysteresis Fixed ring-trip threshold function battery voltage Software-controllable dual-current limit option 40mA ground open control input UL1950 Compatible When ringing, |VTIP| |VRING| clamped less than 56.5 Thermal shutdown protection with hysteresis 28-pin PLCC package Technology
DESCRIPTION
Legerity Le9500 device, part VE950 series, subscriber line interface circuit (SLIC) that optimized short-loop, power-sensitive applications. This device provides complete line interface functionality (including power ringing) needed interface subscriber loop while providing ultra power dissipation. Le9500 SLIC device capable operating with supply designed minimize external components required device interfaces. differential ringing receive inputs make device ideal direct interface Data Over Cable Service Interface Specification (DOCSIS) compliant cable modem gateways, multimedia adaptors, residential gateway products, such Broadcom® BCM3367/3368, BCM3341/3351/3352, BCM6353, BCM1101 equivalent products.
BLOCK DIAGRAM
VREF AGND BGND VBAT2 VBAT1 VPROG NSTAT RTFLT DCOUT GAIN POWER VITR CURRENT LIMIT INRUSH CONTROL RING TRIP
BAND-GAP REFERENCE
LOOP CLOSURE
RECTIFIER (ITR/306) GAIN RCVP RCVN
TIP/RING CURRENT SENSE
RINGING GAIN
PARALLEL DATA INTERFACE
RINGINN RINGINP
Document 081189 Date: Rev: Version: Distribution: Public Document
2006
TABLE CONTENTS
Applications Features Ordering Information Description. Block Diagram Table Contents Product Description Connection Diagram Descriptions Absolute Maximum Ratings Operating Ranges Electrical Characteristics Supply Currents Power Dissipation Line Characteristics Operating States Operating State Definitions Test Circuit. Applications Loop Current Limit Overhead Voltage Loop Range Battery Reversal Rate Supervision Power Ring Design Examples Physical Dimensions Revision History Revision Revision Revision Revision Revision Revision Revision
Le9500 VE950 Series Data Sheet
PRODUCT DESCRIPTION
Le9500 device optimized provide battery feed, ringing, supervision short Plain Telephone Service (POTS) loops. This device provides power ringing subscriber loop through amplification low-voltage input. also provides forward reverse battery feed states, on-hook transmission, low-power scan state, ground start (tip open), forward disconnect state. Le9500 device requires 3.3V battery operate eight operating states. battery switch included allow lower-voltage battery off-hook condition, thus minimizing short-loop off-hook power. following batteries used: high-voltage operation ringing battery (VBAT1): VBAT1 used scan, on-hook transmission, ground start, power ringing. maximum Le9500A, Le9500B, -100V Le9500C Le9500D. Le9500D during ringing only this voltage extended -145 supply externally adjustable. adjusted back more than -100 other operation states. Further, when -145 used ringing special care should applied prevent certain faults from happening such ring, ring ground.
lower-voltage talk battery (VBAT2): VBAT2 used active state powering. 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. ring trip threshold given battery voltage fixed with hysteresis. Ground start detection also fixed threshold with hysteresis. current limit fixed logic-controllable pin. Ground open applied this sets current limit high value. This device designed ultra-low power operating states. Forward reverse battery active states 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 states 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 states conserve power. Because on-hook transmission allowed scan state, on-hook transmission state defined. This state functionally similar active state, except ring voltage derived from higher VBAT1 rather than VBAT2. on-hook transmission states with primary battery whose magnitude greater than nominal 56.5 magnitude tip-to-ground ring-to-ground voltage clamped less than 56.5 minimize on-hook power, low-power scan state available. this state, functions except off-hook supervision turned conserve power. On-hook transmission allowed scan state. scan state with primary battery whose magnitude greater than nominal 56.5 magnitude tip-to-ground ring-to-ground voltage clamped less than 56.5 forward disconnect state provided, where circuits turned power denied loop. device offers ring state, which power ring signal provided tip/ring pair. During ring state, user-supplied lowvoltage ring signals input device's RINGINP/N inputs. input signals differential single-ended, either both include certain offset. Both inputs should reference Vref. signals amplified produce power ring signal. input signal signals sine wave filtered square wave produce sine wave trapezoidal output. Ring Trip detector active during ring state. flexibility makes device ideal directly interface DOCSIS compliant cable modem gateway products. This feature eliminates need separate external ring relay, associated external circuitry, bulk ringing generator. device offers ground start state. this state, drive amplifier turned off. device presents high impedance (>100 current-limited battery (VBAT1) voltage clamped less than 56.5 magnitude. NSTAT loop current detector used ring ground detection. ground start state, since loop current common state, loop closure threshold reduced half, thus maintaining loop supervision specified levels. Upon reaching thermal shutdown temperature, device will enter state. Upon cooling, device will re-enter state prior thermal shutdown. Hysteresis built prevent oscillation. Data control parallel unlatched control scheme. Circuitry added Le9500 device minimize inrush current from supply battery supply during off-hook transition, thus saving power supply design cost.
Le9500 VE950 Series Data Sheet
Le9500 device uses voltage feed-current sense architecture. transmit gain transimpedance. Le9500 device transimpedance single external resistor, this device designed optimal performance with transimpedance V/A. This interface single ended. Le9500 device offers differential receive interface with gain Le9500 device internally referenced This reference voltage output VREF device. VITR output also referenced RCVP/RCVN receive inputs floating inputs. Le9500 device available 28-pin PLCC package.
CONNECTION DIAGRAM
Figure Le9500 28-Pin PLCC Connection Diagram
NSTAT RCVN RCVP VITR
RINGINN
RINGINP
DCOUT
28-PIN PLCC
RTFLT
VREF
AGND VBAT1 VBAT2 BGND VPROG
Le9500 VE950 Series Data Sheet
DESCRIPTIONS
Name NSTAT VITR RCVP RCVN RINGINN Type Output Output Input Input Input Description 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 (Non inverting). 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 Device Internal Reference Voltage. Output internal reference voltage. Analog Signal Ground. Analog Power Supply. typical. Battery Supply High-voltage battery. Battery Supply Lower-voltage battery. Battery Ground. Ground return battery supplies. Connection. Current-Limit Program Input. Connect this ground current limit leave this open current limit Polarity Reversal Slowdown Capacitor. Connect capacitor from this node controlling rate battery reversal. ramped battery reversal desired, leave this floating. Polarity Reversal Slowdown Capacitor. Connect capacitor from this node controlling rate battery reversal. ramped battery reversal desired, leave this floating. 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.
RINGINP DCOUT RTFLT VREF AGND VBAT1 VBAT2 BGND VPROG
Input Output Output Ground Power Power Power Ground Input Input Input Input Input Output Input
Le9500 VE950 Series Data Sheet
ABSOLUTE MAXIMUM RATINGS
Stresses above those listed under Absolute Maximum Ratings cause permanent device failure. Functionality above these limits implied. Exposure absolute maximum ratings extended periods affect device reliability.
Parameter Supply (VCC) Battery Supply (VBAT1) (Le9500A) Battery Supply (VBAT1) (Le9500B) Battery Supply (VBAT1) (Le9500C) Battery Supply (VBAT1) (Le9500D Non-Ringing) Battery Supply (VBAT1) (Le9500D Ringing) 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) Immunity (Human Body Model) Symbol VBAT1 VBAT1 VBAT1 VBAT1 VBAT1 VBAT2 VPT, VPT, -0.5 BGND BGND BGND BGND BGND BGND -0.5 -0.5 VBAT1 VBAT1 -110 -110 -155 VBAT1 JESD22 Class compliant Unit
Note: Continuous operation above junction temperature degrade device reliability.
Package Assembly
Green package devices assembled with enhanced environmental compatible lead-free, halogen-free, antimony-free materials. leads possess matte-tin plating which compatible with conventional board assembly processes newer leadfree board assembly processes. peak soldering temperature should exceed 245°C during printed circuit board assembly. Refer IPC/JEDEC J-Std-020B Table recommended solder reflow temperature profile.
OPERATING RANGES
Environmental Ranges
Legerity guarantees performance this device over commercial industrial (-40 temperature ranges conducting electrical characterization over each range conducting production test with single insertion coupled periodic sampling. These characterization test procedures comply with section 4.6.2 Bellcore GR-357-CORE Component Reliability Assurance Requirements Telecommunications Equipment.
Ambient Temperature Ambient Relative Humidity -40° +85°
Electrical Ranges
Parameter Supplies (VCC) High Office Battery Supply (VBAT1) (Le9500A) High Office Battery Supply (VBAT1) (Le9500B) High Office Battery Supply (VBAT1) (Le9500C) High Office Battery Supply (VBAT1) (Le9500D) High Office Battery Supply (VBAT1) (Le9500D) (during ringing only) Auxiliary Office Battery Supply (VBAT2) 3.13 3.47 -100 -100 -145 VBAT1
(|VBAT1|<=100)
Unit
Le9500 VE950 Series Data Sheet
Thermal Characteristics
Parameter Thermal Protection Shutdown (Tjc)1
Unit
°C/W °C/W °C/W °C/W
PLCC Thermal Resistance Junction Ambient (JA) Natural Convection 2S2P Board Natural Convection 2S0P Board
Wind Tunnel Linear Feet Minute (LFPM) 2S2P Board Wind Tunnel Linear Feet Minute (LFPM) 2S0P Board
35.5 50.5 31.5 42.5
This parameter tested production. guaranteed design device characterization. Airflow, board layers, other factors greatly affect this parameter.
ELECTRICAL CHARACTERISTICS Supply Currents
Unless otherwise specified, VBAT1 Le9500A; VBAT1 Le9500B; VBAT1 -100 Le9500C Le9500D;
VBAT2 Parameter Scan state; loop current: IVCC IVBAT1 IVBAT2 Forward/reverse active; loop current, with without PPM, VBAT2 applied: IVCC IVBAT1 IVBAT2 On-hook transmission state; loop current, with without PPM, VBAT1 applied: IVCC IVBAT1 IVBAT2 Disconnect state: IVCC IVBAT1 IVBAT2 Ground start state, loop current: IVCC IVBAT1 IVBAT2 Ring state; load (VBAT1= -145V Le9500D): IVCC IVBAT1 IVBAT2 0.25 0.25 0.44 Unit
Le9500 VE950 Series Data Sheet
Power Dissipation
VBAT2 -21V, VCC=3.3V.
Parameter Scan state; loop current Forward/reverse active; loop current, VBAT2 applied On-hook transmission state; loop current, VBAT1 applied Disconnect state Ground start state Ring state; load Scan state; loop current Forward/reverse active; loop current, VBAT2 applied On-hook transmission state; loop current, VBAT1 applied Disconnect state Ground start state Ring state; load Scan state; loop current Forward/reverse active; loop current, VBAT2 applied On-hook transmission state; loop current, VBAT1 applied Disconnect state Ground start state Ring state; load Scan state; loop current Forward/reverse active; loop current, VBAT2 applied On-hook transmission state; loop current, VBAT1 applied Disconnect state Ground start state Ring state; load
Le9500A (VBAT1 Le9500B (VBAT1 Le9500C (VBAT1 -100
Unit
Le9500D (VBAT1 -100 VBAT1 -145 during ringing only)
Tested -100 VBAT1 production with proportioned limits
Le9500 VE950 Series Data Sheet
LINE CHARACTERISTICS
Unless otherwise specified, test conditions specified Figure page Typical values characteristic device result engineering evaluations. Typical values information purposes only part testing requirements. Minimum maximum values apply across operating temperature range entire battery range unless otherwise specified. Typical defined VBAT2 VBAT1 Scan/OHT/Ground Start/Disconnect states, V/-85 -100 V/-145 Ringing state Le9500A/ B/C/D. Table Two-Wire Port
Parameter Ring Drive Current Longitudinal Signal Ring Drive Current Ringing Longitudinal1 Signal Current1 Longitudinal Current Capability Wire (Longitudinal current independent loop current.)1 Ringing Current (RLOAD 1386 µF)1 Loop Current Limit ILIM (VBAT2 applied, RLOOP VPROG AGND VPROG Open Current Limit Variation Feed Resistance (does include protection resistors) Open Loop Voltages: Scan state: |VBAT1| |VTIP| |VRING| |VTIP|, |VRING| Battery Ground state: |VBAT1| |VTIP| |VRING| |VTIP|, |VRING| Battery Ground Active state: |VTIP VRING| |VBAT2| Ring state: |VTIP VRING| |VBAT1| Loop Closure Threshold: Scan/Active/On-hook Transmission states, Off-hook Loop Closure Threshold Hysteresis: Scan/Active/On-hook Transmission states Longitudinal Metallic Balance PT/PR2: Test Method: Q552 (11/96) Section 2.1.2 IEEE 455: Metallic Longitudinal (HARM) Balance3: 1000 4000 PSRR 3000 Hz1: VBAT1, VBAT2 Tested 1KHz production. test only. 11.0 12.6 5.75 56.5 56.5 Currents1 mArms Unit mApk
This parameter tested production. guaranteed design device characterization.
Le9500 VE950 Series Data Sheet
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 Resistance1 Output Load Capacitance1 RCVN RCVP: Input Voltage Range Input Bias Current Differential PT/PR Current Sense (DCOUT): Gain (PT/PR DCOUT) Offset Voltage ILOOP Termination Impedance2 Total Harmonic Distortion (200 kHz) Off-hook On-hook Transmit Gain 1004 1020 Hz)3: PT/PR Current VITR Receive Gain, 1004 1020 Open Loop RCVP RCVN Gain Frequency (transmit receive) Termination, 1004 1020 Reference: Gain Level (transmit receive)1, Reference: +3.0 Idle-channel Noise (tip/ring), Termination: C-Message Psophometric1 Flat1 Idle-channel Noise (VTX), Termination: C-Message Psophometric1 Flat1 -0.3 -0.05 -3.0 -0.05 0.05 0.05 0.05 0.05
±300 AGND AGND 0.25 AGND 0.35 7.76
0.12
1400 8.24
Unit
dBmC dBrnp dBrn dBmC dBrnp dBrn
This parameter tested production. guaranteed design device characterization. externally either discrete external components third- fourth-generation codec. complex impedance between 1400 synthesized. VITR transconductance depends resistor from VITR. This gain assumes ideal 4.75 (the recommended value). Positive current defined differential current flowing from
Le9500 VE950 Series Data Sheet
Table Logic Inputs Outputs
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 Symbol -0.5 Unit
Table Ground Start
Parameter Open state Input Impedance Threshold, Off-hook Hysteresis Unit
Table Ringing Specifications
Parameter RINGINN/P: Input Voltage Swing Ring Signal Isolation: PT/PR Ring state Ring Signal Isolation: RINGIN PT/PR Non-ringing state Ring Signal Distortion1: Open Load, Loop (Ringing Equivalency Number) equivalent 1380 series with Differential Gain RINGINP/N PT/PR RLOAD Open, VBAT1 (Le9500A), VRINGINP/N 0.51 VPP; VBAT1 (Le9500B), VRINGINP/N 0.59 VPP; VBAT1 -100 (Le9500C), VRINGINP/N 0.70 VPP; VBAT1 -145 (Le9500D), VRINGINP/N 1.04 VPP. Unit
This parameter tested production. guaranteed design device characterization.
Table Ring Trip
Parameter Ring Trip (NSTAT Loop Resistance (total) VBAT1 Applied Ring Trip (NSTAT Loop Resistance (total) VBAT1 Applied Trip Time Hz)1 Hysteresis
Unit
This parameter tested production. guaranteed design device characterization.
Le9500 VE950 Series Data Sheet
Pre-trip immunity
Ringing will tripped following loads across Ring shown reference schematic this document. Ringing frequency otherwise specified. 10-k resistor parallel with Ringer Equivalency Number (REN) (equivalent 1386- 40-µF) GR-909 Issue December 2004 10-k resistor parallel with 2-µF capacitor parallel with Ringer Equivalency Number (REN) (equivalent 1386- 40-µF) Issue October 2001.
OPERATING STATES
Table Control States Forward active Reverse active On-hook transmission forward battery On-hook transmission reverse battery Ground start Scan Disconnect (default device power state) Ring Operating State
Table Supervision Coding NSTAT off-hook ring trip thermal shutdown ring ground. on-hook ring trip thermal shutdown ring ground.
Operating State Definitions
Forward Active
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 with mVrms PPM. 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 with mVrms PPM. 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 -100 primary battery. positive with respect VBAT1 applied tip/ring drive amplifiers. Supervision circuits, loop closure, common-mode detect active. Ring trip detector turned conserve power. Le9500 VE950 Series Data Sheet
Reverse Active
Scan
On-Hook Transmission-Forward Battery
On-hook transmission allowed. ring on-hook differential voltage will typically between with -100 primary battery. positive with respect VBAT1 applied tip/ring drive amplifiers. Supervision circuits, loop closure, common-mode detect active. Ring trip detector turned conserve power. On-hook transmission allowed. ring on-hook differential voltage will typically between with -100 primary battery. tip/ring amplifiers supervision turned off. SLIC device goes into high-impedance state. NSTAT forced high (on-hook). internal pull-ups, device will power this state. Power ring signal applied ring. Input wave form RINGINN/P amplified. Ring trip supervision common-mode current supervision active; loop closure inactive. Overhead voltage reduced typically drive amplifier turned off. Device presents high impedance (>100 Device presents clamped (amplitude <56.5 current-limited battery (VBAT1) controlled truth table inputs. This mode caused excessive heating device, such encountered extended power cross situation. NSTAT output forced hook during thermal shutdown event.
On-Hook Transmission-Reverse Battery
Disconnect
Ring
Ground Start
Thermal Shutdown
Le9500 VE950 Series Data Sheet
TEST CIRCUIT
Figure Le9500 Device Basic Test Circuit
RTFLT DCOUT RLOOP /600 RING
RINGINN
RINGINN
RINGINP VITR
RINGINP VITR 69.8
RCVP
60.4 26.7
VPROG VREF
Le9500 BASIC TEST CIRCUIT
RCVN
VBAT2 VBAT1 BGND AGND NSTAT
4750
VBAT2 VBAT1
Figure Metallic PSRR
VBAT VBAT VT/R BASIC TEST CIRCUIT RING VT/R Disconnect Bypass Capacitor
PSRR 20log
Le9500 VE950 Series Data Sheet
Figure Longitudinal PSRR
VBAT VBAT 67.5 67.5 56.3 PSRR 20log Disconnect Bypass Capacitor
BASIC TEST CIRCUIT RING
Figure
Longitudinal Balance
BASIC TEST CIRCUIT RING
LONGITUDINAL BALANCE 20log
Figure
Gains
VT/R BASIC TEST CIRCUIT
VITR
VVITR GXMT VT/R GRCV VT/R VRCV
Le9500 VE950 Series Data Sheet
APPLICATIONS Loop Current Limit
Current limit chosen from discrete values, depending VPROG grounded left floating mA). Note that there 12.5 slope characteristic current-limit region; thus, once current limit, actual loop current will increase slightly, loop length decreases. above describes active state steady-state current-limit response. There will transient response current-limit circuit upon off-hook transition. Typical active state transient current-limit response given Table Table Typical Active state On-Hook Off-Hook Tip/Ring Current-Limit Transient Response Parameter Loop Current: Active state RLOOP Off-hook Transition Loop Current: Active state RLOOP Off-hook Transition Loop Current: Active state RLOOP Off-hook Transition Value ILIM Unit
ILIM
ILIM
Overhead Voltage
Active state
Overhead fixed nominal which adequate on-hook transmission 3.14 into with additional head room 500-mV signal.
Scan state
magnitude primary battery greater than (but more 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 about less than battery.
On-Hook Transmission state
magnitude primary battery greater than (but more 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.
Ring state
ring state, maximize ringing loop length, overhead decreased saturation ring drive amplifiers, nominal During ring state, conserve power, receive input RCVN/RCVP deactivated. During ring state, conserve power, amplifier transmit direction VITR deactivated. However, amplifier active during ring state; differential ring current sensed during ring state.
Loop Range
loop range calculated using following equation: BAT2 RLOOP LOOP where: VBAT2 applied under off-hook conditions power conservation SLIC device thermal considerations. overhead voltage, typically 7.2V. feed impedance, typically protection resistor, typically Le9500 VE950 Series Data Sheet
ILOOP loop current, more than current limit. minimum loop current allowed VBAT2 -21V then maximum loop resistance equation This includes telephone loop. Le9500 device intended short-loop applications and, therefore, could always current limit during off-hook conditions. above equation does apply when current current limit region. actual maximum loop length device support, however, often limited ringing loop length rather than loop length (with adequate amplitude VBAT2).
Battery Reversal Rate
rate battery reverse controlled ramped capacitors CFB1 CFB2. chart showing CFB1 CFB2 values versus typical ramp time given below. Leave open desired ramp rate battery reversal. with 0.47 CTX. voltage seen pins SLIC close VBAT1. value CFB1 CFB2 being greater than 0.22 recommended. Table CFB1 CFB2 Values versus Typical Ramp Time CFB1 CFB2 0.001 0.01 0.022 0.047 0.15 Transition Time
Supervision
Le9500 device 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 state, loop closure detector valid NSTAT during active on-hook transmission states. Additionally, common-mode current detected ground start applications. This status output onto NSTAT valid during ground start mode.
Loop Closure
loop closure fixed on-hook off-hook threshold Scan/Active/OHT states with hysteresis.
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 following: (mA) {(0.0045 VBAT1) 0.317} where: ring trip current VBAT1 magnitude ring battery There typical hysteresis.
Ground Start
ground start applications, loop closure detector also used indicate 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 output seen NSTAT output pin.
Power Ring
device offers ring state, which balanced power ring signal provided tip/ring pair. During ring state, usersupplied low-voltage ring signals input device's RINGINP/N inputs. These signals amplified produce balanced power ring signals. user supply sine wave input, input, square wave produce sinusoidal trapezoidal ringing ring.
Le9500 VE950 Series Data Sheet
Sine Wave Input Signal Sine Wave Power Ring Signal Output
low-voltage sine wave input applied differentially single ended Le9500 device pins RINGINP RINGINN. During ring state, signals pins RINGINP RINGINN amplified presented subscriber loop. differential gain from RINGINP/N ring specified device specifications. When device enters Ring state, clamp circuit disabled, allowing voltage magnitude power ring signal maximized. Additionally, Ring state, loop current limit increased limited loop current limit. magnitude power ring voltage will function gain ring amplifier, high-voltage battery, input signal level RINGINP/N. input range signal RINGINP/N Vcc. input voltage RINGINP/N increased, magnitude power ring voltage ring will increase linearly, 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-degree phase from signal ring. point which clipping power ring signal begins ring function battery voltage, input capacitor RINGINP/N, input signal RINGINP/N VCC. During non-ringing states, sinusoidal ringing waveform left RINGINP/N. state table, ring signal will removed from ring, even voltage input still present RINGINP/N.
Power Ringing with Le9500D
operation Le9500D device with high magnitude VBAT1 greater than -100 special attention must given following areas system level.
Ringing Cadence
Scan Hook transmission state must used during silent period ringing. Active state.
VBAT1 supply
VBAT1 more negative than -100 only during actual power ringing. amplitude VBAT1 should exceed when SLIC device Ringing mode. amplitude VBAT1 exceed during silent period ringing other non-ringing mode operation.
Pre-Trip Immunity
Le9500D device pre-trip immunity specified With battery voltages more negative than -100 ringing into heavy trip load will generate excessive power. Depending system ambient conditions, ringing into load heavier than could force device into thermal shutdown. Under these conditions, device goes into thermal shutdown glitch will appear NSTAT. Proper operation require system filter these glitches.
Robust Ring Trip Indication
Upon ring trip, there will large current going through SLIC device which cause SLIC into thermal shutdown. Upon thermal shutdown, NSTAT remains Low, which still consistent with Ring Trip state. During thermal shutdown, voltage RTFLT will because Ring amplifiers off. When voltage RTFLT passes certain limit (ring trip threshold), until SLIC state change, NSTAT will toggle between thermal shutdown inducted indication RTFLT voltage high indication. There several ways help remedy this situation. Limit current VBAT1 supply such that VBAT1 will move towards ground upon hook, 100- power resistor VBAT1, resistor from RTFLT ground lower ring trip threshold. more details, please contact Legerity field/customer applications.
Le9500 VE950 Series Data Sheet
Design Examples
following reference schematics show complete Le9500 SLIC schematic interfaces Broadcom codecs.
Le9500/Broadcom® Reference Schematic
following reference circuit shows complete Le9500 SLIC device schematic interface Broadcom BCM3352 designed Broadcom BCM93352SV application reference design board. This circuit 600- termination. BCM3351, BCM3352, BCM6352 have programmable registers modify external 600- termination achieve worldwide real complex terminations. complex terminations with BCM1101, external circuit must changed complex termination. Other resistive terminations require change this circuit. Contact your Legerity account representative assistance with modifications this circuit.
VBAT1ext CVBAT1 DVBAT1 VBAT2 CVBAT2 VBAT2 AGND VDDCORE VDDI/O
VBAT1 RTFLT
BGND
DCOUT VBAT1ext RING Protector
CMLEVEL VREF_IO
VTXP VITR
88.7
VTXN
Le9500
RCVP
78.7 VPROG VREF 54.9 RCVN
88.7
BROADCOM BCM3351 BCM3352 VRXP BCM6352 BCM1101 BCM3341
0.47 4.75
VRXN RINGREFN
RINGINN
NSTAT
RINGINP
RINGREFP
0.22
RNSTAT
Le9500 VE950 Series Data Sheet
Application Circuit Parts List
following parts list Legerity Le9500 SLIC device Broadcom BCM3352 codec (per Broadcom BCM93552SV application board daughter board components), fully programmable.
Item Protector Type Resistor Resistor Battery referenced thyristor Capacitor Value Tolerance Rating Fusible Fusible Comments Protection resistor. Protection resistor. Secondary protection. Reference most negative power supply (VBAT1ext). Consult protector vendor recommended value. VBAT1 filter capacitor. VBAT2 filter capacitor. |VBAT2| |VBAT1|. Reverse current. Ceramic bypass capacitor. Filtering. Filter capacitor. Filter capacitor. Ring trip filter capacitor. Ring trip filter resistor. Sets VITR transimpedance. AC/DC separation. blocking capacitor interface. interface. interface. interface. interface. Control.
Fault Protection
Power Supply CVBAT1 CVBAT2 DVBAT1 RNSTAT Le9500 Capacitor Capacitor Diode Capacitor Ferrite Bead Capacitor Capacitor Capacitor Resistor Resistor Capacitor Capacitor Resistor Resistor Resistor Resistor Resistor Resistor SLIC device 1N4004 0.47 BLM11A601SPB 0.22 4.75 0.47 78.7 88.7 54.9 88.7 Murata® Ring Trip 1/16 Interface 1/16 1/16 1/16 1/16 1/16 1/16 1/16
Note: Increase Le9500C Le9500D. Assume |VBAT2|<50V.
Le9500 VE950 Series Data Sheet
Le9500/Broadcom® Reference Schematic
following reference schematic shows complete Le9500 SLIC device schematic interface Broadcom BCM3367/ 3368. This circuit natural 700- termination impedance. BCM3367 MCB3368 programmable registers modify external 700- termination achieve worldwide real complex terminations, well transmit receive gains, other parameters. BCM3367/3368 codec also drives ringing inputs, sets SLIC operation state, monitors NSTAT. voltage battery supply VBAT1 expected properly vary depending upon SLIC operational states. Contact your Legerity account representative assistance with other applications.
VBAT1ext CVBAT1 DVBAT1 VBAT1 BGND CVBAT2 VBAT2 VBAT2 CVCC AGND CVTXP RTFLT
RVTXP
VDDCORE
VDDI/O
VTXP
DCOUT
CVITR
RVTXN
APM_LAVDD_1P2
VITR RVITR
VTXN
VBAT1ext
Protector VPROG
Le9500
RCVP RRCVP VREF RRCVN 61.9 RCVN RINGINN
RCIP
VRXP
BROADCOM BCM3367 BCM3368
RING
0.47 4.75
RCIN
VRXN
RINGREFN CINGN
NSTAT
RINGINP CINGP
RINGREFP
0.22
RNSTAT
Le9500 VE950 Series Data Sheet
Application Circuit Parts List
following parts list Legerity Le9500 SLIC device Broadcom BCM3367/3368 codec.
Item Protector Type Resistor Resistor Battery referenced thyristor Capacitor Value Tolerance Rating Fusible Fusible Comments Protection resistor. Protection resistor. Secondary protection. Reference most negative power supply (VBAT1ext). Consult protector vendor recommended value. VBAT1 filter capacitor. VBAT2 filter capacitor. |VBAT2| |VBAT1|. Reverse current. Ceramic bypass capacitor. Filtering. Filter capacitor. Filter capacitor. Ring trip filter capacitor. Ring trip filter resistor. Sets VITR transimpedance. AC/DC separation. blocking capacitor. blocking capacitor. interface. interface. interface. interface. interface. interface. interface. Ringing interface. Ringing interface. Control.
Fault Protection
Power Supply CVBAT1 CVBAT2 DVBAT1 CVCC CVITR CVTXP RVITR RVTXP RVTXN RCIP RCIN RRCVP RRCVN CINGP CINGN RNSTAT Le9500 Capacitor Capacitor Diode Capacitor Ferrite Bead Capacitor Capacitor Capacitor Resistor Resistor Capacitor Capacitor Capacitor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Capacitor Capacitor Resistor SLIC device 1N4004 0.47 Murata® BLM11A601SPB 0.22 4.75 0.47 61.9 0.068 0.068 Ring Trip 1/16 Interface 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16
Note: Increase Le9500C Le9500D. Assume |VBAT2|<50V.
Le9500 VE950 Series Data Sheet
PHYSICAL DIMENSIONS
28-Pin PLCC
rev. 8/00
28-Pin PLCC
Le9500 VE950 Series Data Sheet
REVISION HISTORY Revision
Added Note Supply Currents Power Dissipation tables. Updated typical values 3.3V Supply Currents Power Dissipation tables. Added Le9500C section with "TBD" values. Removed "150V" from "150V Technology", page Corrected Battery Supply Office Battery Supply specifications absolute electrical ranges, page Fixed "5-V" formatting power dissipation tables, page10. Corrected typical values Table added "Note Longitudinal Metallic Balance, "Note metallic Longitudinal Balance, page Applied "Note Psophometric 3-kHz Flat ICN, page Combined Ground Start Hysteresis line, added "Note Differential Gain Table page Corrected wording "(-65V 105V)" "(-65V -100V)" under power control section, page
Revision
Removed standard OPNs added green package OPNs Ordering Information, page Added Package Assembly, page
Revision
Added Le9500D device information.
Revision
Ordering Information, page added column packing; added Note instructions tape/reel ordering. Electrical Characteristics, page 7,changed Active State /PT-PR/-/Vbat2/ maximum from 7.75
Revision
Absolute Maximum Ratings, page separated ratings VBAT1 non-ringing ringing states. Ring Trip, page added pre-trip condition Le9500D device. Added Power Ringing with Le9500D, page
Revision
Added note (the note under Thermal Characteristics table page removed corresponding statement about note under ABSOLUTE MAXIMUM RATINGS table page
Revision
Removed descriptions specifications related Added BCM3367/3368 Applications, page Updated Thermal Characteristics, page Added test conditions Line Characteristics, page Updated Loop Closure Thresholds Hysteresis Table Two-Wire Port, page Updated PSRR reflect VCC= Table Two-Wire Port, page Corrected DCOUT gain Table Analog Characteristics, page Updated Ring Signal Distortion Differential Gain RINGINP/N PT/PR Table Ringing Specifications,
page
Updated descriptions Loop Current Limit, page Updated descriptions Battery Reversal Rate, page Table CFB1 CFB2 Values versus Typical Ramp Time, page Updated descriptions Power Ring, page Added Reference Schematic page Added Parts List page
Le9500 VE950 Series Data Sheet
contents this document provided connection with Legerity, Inc. products. Legerity makes representations warranties with respect accuracy completeness contents this publication reserves right make changes specifications product descriptions time without notice. license, whether express, implied, arising estoppel otherwise, intellectual property rights granted this publication. Except forth Legerity's Standard Terms Conditions Sale, Legerity assumes liability whatsoever, disclaims express implied warranty, relating products including, limited implied warranty merchantability, fitness particular purpose, infringement intellectual property right. Legerity's products designed, intended, authorized warranted components systems intended surgical implant into body, other applications intended support sustain life, other application which failure Legerity's product could create situation where personal injury, death, severe property environmental damage occur. Legerity reserves right discontinue make changes products time without notice.
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Other product names used this publication identification purposes only trademarks their respective companies.
Le9500 VE950 Series Data Sheet
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High-Voltage Ringing SLIC Device VolP Applications VE950 Series I

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