LTC2421 LINER [Linear Technology], LTC2421 Datasheet - Page 32

• Manufacturer Part Number: LTC2421
• Description: 1-/2-Channel 20-Bit UPower No Latency ADCs in MSOP-10
• Manufacturer: LINER [Linear Technology]

TYPICAL APPLICATIO
LTC2421/LTC2422
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
RELATED PARTS
PART NUMBER
LT1019
LTC1050
LT1236A-5
LTC1391
LT1461-2.5
LTC1535
LTC2400
LTC2401/LTC2402
LTC2404/LTC2408
LTC2413
LTC2415
LTC2420
LTC2424/LTC2428
LTC2430
LTC2431
32
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone]
DESCRIPTION
Precision Bandgap Reference, 2.5V, 5V
Precision Chopper Stabilized Op Amp
Precision Bandgap Reference, 5V
8-Channel Multiplexer
Precision Micropower Voltage Reference
Isolated RS485 Transceiver
24-Bit, No Latency
1-/2-Channel, 24-Bit, No Latency
4-/8-Channel, 24-Bit, No Latency
24-Bit, No Latency
24-Bit, Fully Differential, No Latency
20-Bit, No Latency
4-/8-Channel, 20-Bit, No Latency
20-Bit, Fully Differential, No Latency
24-Bit, Fully Differential, No Latency
OR COUNTER)
(ADDRESS
SCK
SD0
D
IN
Figure 37. Mulitchannel Isolated Temperature Measurement System
U
ADC in SO-8
ADC
ADC in SO-8
ADDRESS
HC595
LATCH
HC138
HC138
www.linear.com
ADC in MSOP
ADC
ADC
ADC
ADC in SSOP-16
ADC in MS10
SEE FIGURE 34 FOR
THE COMPLETE CIRCUIT
D1
RE
D1
RE
D1
R0
R0
RE
R0
LTC1535
LTC1535
LTC1535
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.
COMMENTS
3ppm/ C Drift, 0.05% Max
No External Components 5 V Offset, 1.6 V
0.05% Max, 5ppm/ C Drift
Low R
50 A Supply Current, 3ppm/ C Drift
2500V
4ppm INL, 10ppm Total Unadjusted Error, 200 A
0.6ppm Noise, 4ppm INL, Pin Compatible with the LTC2421/LTC2422
4ppm INL, 10ppm Total Unadjusted Error, 200 A
Simultaneous 50Hz and 60Hz Rejection, 0.16ppm Noise
15Hz Output Rate at 60Hz Rejection, Pin Conpatible with the LTC2410
1.2ppm Noise, 8ppm INL, Pin Compatible with LTC2400
1.2ppm Noise, 8ppm INL, Pin Compatible with LTC2404/LTC2408
0.16ppm Noise, 2ppm INL, 10ppm Total Unadjusted Error, 200 A
0.29ppm Noise, 4ppm INL, 10ppm Total Unadjusted Error, 200 A
A
Y
A
Y
A
Y
ON
RMS
: 45 , Low Charge Injection Serial Interface
SDO
SCK
SDO
SCK
SDO
SCK
Isolation
LTC2422
LTC2422
LTC2422
ZS
ZS
ZS
SET
SET
SET
FS
FS
FS
CH1
CH0
CH1
CH0
CH1
CH0
V
V
V
SET
SET
SET
CC
CC
CC
24212 F37
+
–
LINEAR TECHNOLOGY CORPORATION 2002
2500V
P-P
LT/TP 0202 2K • PRINTED IN USA
Noise
24212f