Datasheet

MAX132
±18-Bit ADC with Serial Interface
_______________________________________________________________________________________ 5
MAX132
CREF- CREF+
1
20
CS
602k
4
SCLK
3
DOUT
2
DIN
11
EOC
7
P0
8
P1
9
P2
10
P3
23
19
22
21
-5V
512mV INPUT
18
17
65
15pF
15pF
BUF OUT
INT OUT
INT IN
4.7nF
32,768Hz
REF+
REF-
16
15
AGND
IN LO
14
IN HI
13
12
V-
24
V+
DGND
OSC2OSC1
0.1µF
120k
100k
40.2k
2.5V
MAX872
+5V
Figure 1. Test and Typical Application Circuit
_________________________________________________Pin Description (continued)
End of Conversion Output goes high at end of conversion.EOC11
Positive Supply, nominally +5VV+24
User-programmable output bit 3—programmed through the serial port.P310
Negative Reference Capacitor connectionCREF-20
Positive Reference Capacitor connectionCREF+19
Positive Reference InputREF+18
Negative Reference InputREF-17
Analog GroundAGND16
Negative Analog InputIN LO15
Buffer-Amplifier Output drives the integrator resistor.BUF OUT23
User-programmable output bit 2—programmed through the serial port.P29
PIN
Integrator Output. To minimize noise, this pin should drive the capacitor’s outside foil (negative end).INT OUT22
Integrator Input. Connect the integration capacitor between INT IN and INT OUT.INT IN21
FUNCTIONNAME
Positive Analog InputIN HI14
Negative Supply, nominally -5VV-13
Digital Ground—power-supply returnDGND12