MAX1329 Datasheet, PDF (69/78 Pages) Maxim Integrated Products – 12-/16-Bit DASs with ADC, DACs, DPIOs, APIOs, Reference, Voltage Monitors, and Temp Sensor

12-/16-Bit DASs with ADC, DACs, DPIOs, APIOs,
Reference, Voltage Monitors, and Temp Sensor
2N3904
2N3904
AIN1
C_AIN1*
AGND
AIN2
C_AIN2*
AGND
AIN1
AIN2
OUTA/OUT3
FBA/IN3-
OUT1
MUX
IN1-
OUTB/OUT2
FBB/IN2-
TEMP1
TEMP2
TEMP3
DV_DD/4
AV_DD/4
MUX
REFADC
REFDAC
AGND
MAX1329
MAX1330
TEMP
SENSOR
*FOR BEST RESULTS, LIMIT C_AIN1 AND C_AIN2 TO 10pF.
Figure 31. Temperature Measurement with Two Remote Sensors
PGA
12-BIT ADC
A_V = 1, 2, 4, 8
DITHER
ACCUMULATOR
ALARM
ADC FIFO
A_V = 0.5, 0.82, 1
TEMP1
2.5V
REF
A_V = 0.5, 0.82, 1
REFADC
REFADC
REFADJ
REFDAC
1μF
0.01μF
1μF
Programmable-Gain Instrumentation
Amplifier
Two op amps and two SPDT switches are configured
as a programmable-gain instrumentation amplifier in
Figure 32. It includes a differential input and a single-
ended output. SPDT1 and SPDT2 are configured as
single-pole, double-throw switches. The gain is set by
the following equations:
V_OUT
=
⎛
⎝⎜
R₂ + R₃
R₁
+
⎞
1_⎠⎟
(V_IN+
− V_IN− )
for switch position 1, and
V_OUT
=
⎛ R₃
⎝⎜ R₁ + R₂
+
⎞
1_⎠⎟
(V_IN+
− V_IN− )
for switch position 2.
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