XRD87L99 Datasheet, PDF(16/23 Page) Exar Corporation – LOW POWER, 2 MSPS, 10-BIT, A/D CONVERTER WITH 8-CHANNEL MUX

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XRD87L99 Datasheet, PDF (16/23 Pages) Exar Corporation – LOW POWER, 2 MSPS, 10-BIT, A/D CONVERTER WITH 8-CHANNEL MUX

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XRD87L99

LOW POWER, 2 MSPS, 10-BIT, A/D CONVERTER WITH 8-CHANNEL MUX

REV. 1.0.0

FIGURE 19. Â±6V ANALOG INPUT

1 of 8

+6V

VIN

+3V

VREF(+)

AVDD

AIN1

AIN8

VREF(-)

AGND

DB0

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 * CIN of ADC) time constant. Therefore, for different applica-

tions the R value needs to be selected as a trade-off between AIN settling time and power dissipation.

FIGURE 20. A/D LADDER AND AIN WITH PROGRAMMED CONTROL (OF VREF(+), VREF(-), 1/4 AND 3/4 TAP.)

MP7641

- VIN +

DAC0

XRD87L99

AIN1

- VIN +

DAC7

MP7226

DAC4

DAC3

DAC2

DAC1

AIN8

VREF(+)

3/4

1/4

VREF(+)

VREF1(-)

@ Power Down write values to DAC 3, 2, 1 = DAC 4 to minimize power consumption.

Only AIN and Ladder detail shown.

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