7

LTC1860/LTC1861

18601f

CONV (Pin 1): Convert Input. A logic high on this input

starts the A/D conversion process. If the CONV input is left

high after the A/D conversion is finished, the part powers

down. A logic low on this input enables the SDO pin,

allowing the data to be shifted out.

CH0, CH1 (Pins 2, 3): Analog Inputs. These inputs must

be free of noise with respect to GND.

GND (Pin 4): Analog Ground. GND should be tied directly

to an analog ground plane.

SDI (Pin 5): Digital Data Input. The A/D configuration

word is shifted into this input.

SDO (Pin 6): Digital Data Output. The A/D conversion

result is shifted out of this output.

SCK (Pin 7): Shift Clock Input. This clock synchronizes the

serial data transfer.

free of noise and ripple by bypassing directly to the

LTC1861 (SO-8 Package)

LTC1861 (MSOP Package)

CONV (Pin 1): Convert Input. A logic high on this input

starts the A/D conversion process. If the CONV input is left

high after the A/D conversion is finished, the part powers

down. A logic low on this input enables the SDO pin,

allowing the data to be shifted out.

CH0, CH1 (Pins 2, 3): Analog Inputs. These inputs must

be free of noise with respect to AGND.

AGND (Pin 4): Analog Ground. AGND should be tied

directly to an analog ground plane.

DGND (Pin 5): Digital Ground. DGND should be tied

directly to an analog ground plane.

SDI (Pin 6): Digital Data Input. The A/D configuration

word is shifted into this input.

SDO (Pin 7): Digital Data Output. The A/D conversion

result is shifted out of this output.

SCK (Pin 8): Shift Clock Input. This clock synchronizes the

serial data transfer.

free of noise and ripple by bypassing directly to the

analog ground plane.

fines the span of the A/D converter and must be kept free

of noise with respect to AGND.

PI FU CTIO S

1860/61 BD

12-BIT

SAMPLING

ADC

BIAS AND

SHUTDOWN

CONVERT

CLK

SERIAL

PORT

12-BITS

(CH0)

(CH1)

VCC

VREF

SDO

GND

CONV (SDI) SCK

PIN NAMES IN

PARENTHESES

REFER TO LTC1861

DATA OUT

DATA IN

+

–