Datasheet

36
LTC2404/LTC2408
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC1050 Precision Chopper Stabilized Op Amp No External Components, 5µV Offset, 1.6µV
P–P
LT1236 Precision Bandgap Reference 0.05% Max Initial Accuracy, 5ppm/°C Drift
LT1793 Low Noise JFET Input Op Amp 10pA Max Input Bias Current, Low Voltage Noise: 8nV
LTC2400 24-Bit Micropower ∆Σ ADC in SO-8 <4ppm INL, No Missing Codes, 4ppm Full Scale
LTC2424/LTC2428 20-Bit 4-/8-Channel ∆Σ ADCs 1.2ppm Noise, 8ppm INL, Fast Mode
Fiugre 31. Measure DC to Daylight Using the LTC2408
TYPICAL APPLICATION
U
 LINEAR TECHNOLOGY CORPORATION 1999
24048fa LT/LCG 0700 2K REV A • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear-tech.com
24048 F31
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
9
10
11
12
13
14
15
17
8-CHANNEL
MUX
GND
1, 5, 6, 16, 18, 22, 27, 28
MPU
SERIAL DATA LINK
MICROWIRE AND
SPI COMPATABLE
LT1236CS8-5
23
20
19, 25
21
24
CSADC
CSMUX
CLK
D
IN
SDO
26
F
O
24-BIT
∆Σ ADC
LTC2408
ADCINMUXOUT
7 4 3 2, 8
1µF
5V
V
REF
V
CC
–
+
OUT IN
GND
+
4
26
0V TO 5V
100µF
INTERNAL OSC
SELECTED FOR
60Hz REJECTION
+
10µF
8V
5V
REF
ELECTROMETER
INPUT
(pH, PIEZO)
5V
GUARD RING
DC
VOLTMETER
INPUT
1mV TO 1000V
–5V
R3, 10k
5V
MAX
C1, 0.1µF
LT1793
3
2
6
4
7
+
–
+
5V
–5V
LTC1050
2
3
6
7
4
R4
1k
R9
1k
1%
+
R7
10k, 0.1%
R5
5k, 1%
R8
100Ω, 5%
3-WIRE R-PACK
R6
10k, 0.1%
IN914 IN914
1µF
AC
INPUT
60Hz
60Hz–RF
RF POWER
R1
900k
0.1%, 1W, 1000 WVDC
R2
4.7k
0.1%
50Ω
R13
5k
0.1%
5V
DAYLIGHT
HAMAMATSU
PHOTODIODE
S1336-5BK
100Ω
Pt RTD
(3-WIRE)
RT
FORCE SENSE
INFRARED
INFRARED
THERMOCOUPLE
OMEGA
0S36-01
V
REF
5V
50Ω LOAD
BONDED TO
RTD ON
INSULATED
MOUNTING
R11
24.9k, 0.1%
J1
J2
J3
V
REF
5V
THERMISTOR
10kΩ NTC
LOCAL
TEMP
R12
24.9k, 0.1%
R10
5k
1%
–60mV TO 4V
2.7V AT 0°C
0.9V AT 40°C
–2.2mV to 16mV
0V to 4V
20mV TO 80mV
<1mV