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LTC2421CMS Datasheet(PDF) 32 Page - Linear Technology |
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LTC2421CMS Datasheet(HTML) 32 Page - Linear Technology |
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32 / 32 page  32 LTC2421/LTC2422 24212f LT/TP 0202 2K • PRINTED IN USA ©LINEAR TECHNOLOGY CORPORATION 2002 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1019 Precision Bandgap Reference, 2.5V, 5V 3ppm/ °C Drift, 0.05% Max LTC1050 Precision Chopper Stabilized Op Amp No External Components 5 µV Offset, 1.6µVP-P Noise LT1236A-5 Precision Bandgap Reference, 5V 0.05% Max, 5ppm/ °C Drift LTC1391 8-Channel Multiplexer Low RON: 45Ω, Low Charge Injection Serial Interface LT1461-2.5 Precision Micropower Voltage Reference 50 µA Supply Current, 3ppm/°C Drift LTC1535 Isolated RS485 Transceiver 2500VRMS Isolation LTC2400 24-Bit, No Latency ∆Σ ADC in SO-8 4ppm INL, 10ppm Total Unadjusted Error, 200 µA LTC2401/LTC2402 1-/2-Channel, 24-Bit, No Latency ∆Σ ADC in MSOP 0.6ppm Noise, 4ppm INL, Pin Compatible with the LTC2421/LTC2422 LTC2404/LTC2408 4-/8-Channel, 24-Bit, No Latency ∆Σ ADC 4ppm INL, 10ppm Total Unadjusted Error, 200 µA LTC2413 24-Bit, No Latency ∆Σ ADC Simultaneous 50Hz and 60Hz Rejection, 0.16ppm Noise LTC2415 24-Bit, Fully Differential, No Latency ∆Σ ADC 15Hz Output Rate at 60Hz Rejection, Pin Conpatible with the LTC2410 LTC2420 20-Bit, No Latency ∆Σ ADC in SO-8 1.2ppm Noise, 8ppm INL, Pin Compatible with LTC2400 LTC2424/LTC2428 4-/8-Channel, 20-Bit, No Latency ∆Σ ADC 1.2ppm Noise, 8ppm INL, Pin Compatible with LTC2404/LTC2408 LTC2430 20-Bit, Fully Differential, No Latency ∆Σ ADC in SSOP-16 0.16ppm Noise, 2ppm INL, 10ppm Total Unadjusted Error, 200 µA LTC2431 24-Bit, Fully Differential, No Latency ∆Σ ADC in MS10 0.29ppm Noise, 4ppm INL, 10ppm Total Unadjusted Error, 200 µA Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 q FAX: (408) 434-0507 q www.linear.com TYPICAL APPLICATIO Figure 37 shows the block diagram of a demo circuit (contact LTC for a demonstration) of a multichannel isolated temperature measurement system. This circuit decodes an address to select which LTC2422 receives a 24-bit burst of SCK signal. All devices independently convert either the thermal couple output or the thermistor cold junction output. After each conversion, the devices enter their sleep state and wait for the SCK signal before clocking out data and beginning the next conversion. VCC FSSET CH1 SDO SCK CH0 ZSSET LTC2422 A Y D1 RE R0 LTC1535 VCC FSSET CH1 SDO SCK CH0 2500V ZSSET LTC2422 A Y D1 RE R0 LTC1535 VCC FSSET CH1 SDO SCK 24212 F37 CH0 ZSSET LTC2422 A Y D1 HC138 HC595 ADDRESS LATCH RE R0 LTC1535 SEE FIGURE 34 FOR THE COMPLETE CIRCUIT HC138 SCK SD0 DIN (ADDRESS OR COUNTER) + – Figure 37. Mulitchannel Isolated Temperature Measurement System |
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