xrxr XRD87L99
LOW POWER, 2 MSPS, 10-BIT, A/D CONVERTER WITH 8-CHANNEL MUX
REV. 1.0.0
16
FIGURE 19. ±6V ANALOG INPUT
For R = 5k use Beckman Instruments #694-3-R10k resistor array or equivalent.
NOTE: High R values affect the input BW of ADC due to the (R * C
IN
of ADC) time constant. Therefore, for different applica-
tions the R value needs to be selected as a trade-off between A
IN
settling time and power dissipation.
FIGURE 20. A/D LADDER AND A
IN
WITH PROGRAMMED CONTROL (OF V
REF(+)
, V
REF(-)
, 1/4 AND 3/4 TAP.)
V
REF(+)
V
IN
+
-
2R R
A
IN1
V
REF(-)
+6V
+3V +3V
DB0
AGND
AV
DD
2R
1 of 8
A
IN8
V
IN
+-
@ Power Down write values to DAC 3, 2, 1 = DAC 4 to minimize power consumption.
IN
DAC4
DAC3
DAC2
DAC1
XRD87L99
V
REF(+)
3/4
1/4
V
REF(+)
V
REF1(-)
DAC0
DAC7
+-
A
IN8
A
IN1
MP7641
MP7226
V
IN
