LTC1346AIS Vol. Product Month Power Single Chip DCE/DTE

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LTC1346AIS Vol. Product Month Power Single Chip DCE/DTE

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LTC1346AIS
Vol.
Product Month
Power Single Chip DCE/DTE V.35 Transceiver
1346A single chip transceiver that provides differential clock data signals V.35 interface from supplies. Combined with LT®1134A RS232 transceiver control signals proper termination resistor network, LTC1346A forms complete power V.35 interface port. Figure shows LTC1346A used provide clock data signals another LTC1346A peripheral port. Technologies chip shown surface mount V.35 termination
VEE1
PACKAGE 24-LEAD PLASTIC
resistor network available from Beckman Industrial Technologies. LTC1346A features three current output differential transmitters three differential receivers. transmitters configured operation shut down using three Select pins. shutdown mode, supply current reduced below 1µA. LTC1346A transceiver operates 10Mbaud. transmitters feature short-circuit protection. Both transmitter outputs receiver VEE2 0.1µF VCC2 0.1µF
Figure LTC1346A Available 24-Lead Surface Mount Package Industrial Temperature Range Applications puts feature ±10kV protection. LTC1346A ideal V.35 interface chip modems, data routers other telecommunications applications with available. single applications, single supply LTC1345 V.35 chip includes charge pump generate from LTC1346A available 24-lead plastic surface mount package. Device operating temperature specified form 70°C commercial LTC1346ACS -40°C 85°C industrial version, LTC1346AIS. Contact your local Linear Technology sales office data sheet free evaluation samples LTC1346A.
LTC1346A 0.1µF VCC1 (102) (104) (115) (114) SCTE (113) 627T500/1250 (103) 627T500/1250
LTC1346 TA01
LTC1346A
VCC1
VCC2
Figure V.35 Clock Data Signals Supplied Single LTC1346A
Inside This Issue:
Single 250kbaud RS232/RS485 Multiprotocol Transceiver Software Configurable LTC1430 Provides Efficient Supply 5ppm/°C, 0.05% Accurate, Industrial Grade Voltage Reference 8-Lead Surface Mount Package
registered trademarks Linear Technology Corporation.
Linear Technology Chronicle
0.1µF
TECHNOLOGIES 627T500/1250 (SO)
Half-Bridge N-Channel Power MOSFET Driver Power Supply Motor Control Applications
LT1336 cost effective halfbridge N-channel power MOSFET driver that drive topside N-channel power MOSFET operating with high voltage
Continued page
LT1336 from page
(HV) rail (absolute maximum). operation, on-chip switching regulator maintains charge bootstrap capacitor even when approaching operating 100% duty cycle. LT1336 unique adaptive protection circuitry that prevents shoot thorough current, eliminating matching requirements MOSFETs. This greatly eases design high efficiency motor control switching regulator systems. Fig1N4148 100µH* RSENSE 1/4W
shows LT1336 providing unidirectional motor control. During supply start-up conditions, undervoltage lockout actively pulls driver outputs prevent power MOSFETs from being partially turned 0.5V hysteresis allows reliable operation even with slowly varying supplies. LT1336 ideal driver high current loads, half-bridge full-bridge motor control, synchronous step-down switching regulators, 3-phase
brushless motor drives, high current transducer amplifiers Class power amplifiers. LT1336 available 16-lead plastic dual-in-line surface mount packages specified operation from 70°C. Industrial grade versions also available specified operation from 40°C 85°C. Please contact your local Linear Technology sales office data sheet free evaluation samples LT1336.
VIEW SENSE
LT1336
SWITCH BOOST GATE GATE SOURCE GATE
SENSE LT1336
SWITCH BOOST
1N4148 MAX**
BOTTOM SGND PGND
BOTTOM GATE GATE *DALE 100MB-P **FOR "DERIVING FLOATING SUPPLY WITH FLYBACK TOPOLOGY" APPLICATIONS INFORMATION SECTION DATA SHEET
IRFZ44
GATE GATE
1000µF 100V
10µF BOTTOM
SOURCE GATE GATE
CBOOST IRFZ44
GATE
100kHz
PACKAGE 16-LEAD PLASTIC NARROW
SGND PGND
1336 TA01
Figure LT1336 Available 16-Lead Surface Mount Package Specified Industrial Temperature Range
Figure LT1336 Provides Half-Bridge Motor Drive Control with Capability
Single 250kbaud RS232/RS485 Multiprotocol Transceiver Software Configurable
LTC1334 power CMOS bidirectional transceiver featuring reconfigurable interface ports. configured RS485 differential ports, dual RS232 single-ended ports RS485 differential port dual RS232 single-ended port. onboard charge pump requires four 0.1µF capacitors generate boosted positive negative supplies, allowing RS232 drivers meet RS232 output swing requirement with only single supply. Supply current typically shutdown mode reduces supply current 10µA. Figure shows typical multimode RS232/RS485 port-toport connection using LTC1334. RS232 transceivers typically operate 250kBd full compliance with RS232 specifications. interface
drivers feature short-circuit thermal shutdown protection. Enable allows RS485 driver outputs forced into high impedance, which maintained even when outputs forced beyond supply rail power off. Both driver outputs receiver inputs feature ±10kV protection. loopback mode allows driver outputs connected back receiver inputs
diagnostic self-test. Figure shows various configuration schemes possible with LTC1334 that enable loopback feature. LTC1334 ideal interface device software selectable RS485/ RS422/RS232/EIA562 port applications where multiple protocols need implemented simultaneously.
Continued page
LTC1334
CAPACITORS: 0.1µF MONOLITHIC CERAMIC TYPE RS232 INTERFACE 4000-FT 24-GAUGE TWISTED PAIR RS485 INTERFACE
LTC1334
VCC1
ENABLE
ENABLE
VCC2
LTC1334 TA01
Figure Typical LTC1334 Interface Connection Diagram
Linear Technology Chronicle
Application Month
LTC1430 Provides Efficient Supply
recent trend computer architecture move toward (Gunning Transition Logic) routing high speed signals between chipset logic. Buses with speeds excess 66MHz using this technology. Several different supply voltage standards seem evolving, with voltages from 1.2V 1.5V being discussed most often. some implementations logic family, supply must both source sink currents 10A. This causes great deal difficulty typical current mode control power supply design that incapable controlling negative load currents. LTC1430 voltage mode controller, such, does exhibit problems with negative load currents. Most solutions, however, appear require current sinking supplies LTC1430 well suited these applications well. circuit shown Figure switches 300kHz, regulating input down 1.5V output while maintaining good efficiency (see Figure Figure shows effects fast load transient 1.5V output. initial current final current trace output voltage (100mV/Div) bottom trace regulator's inductor current (5A/Div). Figure load resistor switched from ground supply, resulting bidirectional loading. Current
MBR0530T1 0.1µF 3.3k 220pF 130k 0.01µF 22µF PVCC2 FSET IMAX PVCC1 Si4410 MBRS330T3 2.7µH 1.5V 680pF 16.5k
switched from Again, trace output 1.5V supply. relatively long recovery period actually response pertubation that appears input voltage result large load change. Voltage mode control suffers from inherently poor line rejection. this case, supply used tests exhibits rather poor dynamics. better input supply used, overall settling time will much faster. LTC1430 also very accurate reference exhibits good static load regulation, seen from very small offset between settled light load heavy load conditions output voltage trace.
0.1µF Si4410
0.1µF
6.3V OS-CON
6.3V OS-CON
LTC1430 SHDN PGND COMP SENSE +SENSE SGND 1µF,
6.3V OS-CON
88.7k
6.3V OS-CON
6.3V TANT
6.3V TANT
0.068µF
ADDITIONAL DECOUPLING LOAD
di1430_1.eps
Figure Schematic Diagram Supply
EFFICIENCY
LOAD CURRENT
OUTPUT VOLTAGE 100mV/DIV
OUTPUT VOLTAGE 100mV/DIV
INDUCTOR CURRENT 5A/DIV 1ms/DIV
INDUCTOR CURRENT 5A/DIV 1ms/DIV
di1430_2.eps
Figure Efficiency Plot Supply
Linear Technology Chronicle
Figure Oscillograph Showing Effects Load Step 1.5V Output
Figure Oscillograph Showing Effects Bidirectional Loading Supply
LTC1334 from page
Applications LTC1334 include cable repeaters, level translators CSU/ interface ports telecommunications
PORT RS232 MODE PORT RS232 MODE SEL1 SEL1
control signal applications. LTC1334 available 28-lead plastic dual-in-line 28-lead surface mount packages, specified operation from 70°C. Contact
PORT RS485 MODE PORT RS232 MODE SEL1 PORT RS232 MODE PORT RS485 MODE
your local Linear Technology Corporation sales office data sheet evaluation samples LTC1334.
PORT RS485 MODE PORT RS485 MODE SEL2 SEL1
SEL2
SEL2
SEL2
LTC1334 BD02
Figure LTC1334 Configurations Using Loopback Self Diagnostics Hookup
5ppm/°C, 0.05% Accurate, Industrial Grade Voltage Reference 8-Lead Surface Mount Package
LT1236 industrial grade precision voltage reference 8-lead surface mount package. This reference combines tight 0.05% maximum initial accuracy with 5ppm/°C maximum drift. drift guaranteed measuring slope output voltage temperature. Most references specified using "box" method, often resulting more times worse incremental slope. LT1236 5ppm°C worst-case specification over full temperature range. reference typical 0.1Hz 10Hz noise level 3µVP-P 100% production tested maximum 10Hz 1kHz noise level only 3.5µVP-P. LT1236 available both 8-lead dual-in-line 8-lead surface mount packages three performance grades. Devices provided with output voltages both commercial industrial temperature ranges. output LT1236 sinks sources 10mA almost totally immune input voltage variations.
case with previous high performance voltage references, on-chip heater necessary reach such accurate performance levels when using LT1236. LT1236 references based buried Zener diode structure which eliminates noise stability problems associated with surface breakdown devices. Further, subsurface Zener exhibits better temperature drift time stability than even best bandgap references. Figure shows typical distribution temperature drift with various production runs LT1236 devices. LT1236 used series shunt mode. version used shunt regulator (2-terminal Zener) with same precision characteristics 3-terminal connection. Special care been taken
DISTRIBUTION THREE RUNS
minimize thermal regulation effects temperature induced hysteresis. power, high accuracy LT1236 ideal process control, data acquisition remote sensing applications. LT1236-5 LT1236-10 come three performance grades; versions available specified operation over 70°C range 40°C 85°C range 8-lead dual-in-line (N8) package well 8-lead surface mount (S8) package. Contact your local Linear Technology Corporation sales office data sheet free evaluation samples LT1236.
Linear Technology Products Distributed
Almac/Arrow Arrow/Schweber Arrow/Zeus Digi-Key Electrosonic Gerber Electronics Farnell Electronics Marshall Industries Phase
1996 Linear Technology Corporation/Printed
UNITS
OUTPUT DRIFT (ppm/°C)
LT1236 TA02
Figure LT1236 Output Temperature Drift
Linear Technology Corporation 1630 McCarthy Blvd. Milpitas, California 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ForChronicle January 1996 Linear Technology Literature Only: 1-800-4-LINEAR

LTC1346AIS Vol. Product Month Power Single Chip DCE/DTE

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