AD76881 Просмотр технического описания (PDF) - Analog Devices

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Компоненты Описание

производитель

AD76881

18-Bit, 2 MSPS PulSAR 15 mW ADC in LFCSP (QFN)

Analog Devices 

AD7986

Pin No.

16

17,18

19

20

21 (EPAD)

Mnemonic

AVDD

AGND

BVDD

REFIN

Exposed Pad

Type1

P

P

P

AI/O

EP

Description

Input Analog Power. Nominally at 2.5 V.

Analog Power Ground.

Reference buffer power. Nominally 5.0 V.

If an external reference buffer is used to achieve the maximum SNR performance with 5 V reference,

the reference buffer must be powered down by connecting the REFIN pin to ground. The external

reference buffer must be connected to the BVDD pin.

Internal Reference Output/Reference Buffer Input.

When PDREF = low, the internal band gap reference produces a 1.2 V (typical) voltage on this pin,

which needs external decoupling (0.1 µF typical).

When PDREF = high, use an external reference to provide a 1.2 V (typical) to this pin.

When PDREF = high, and REFIN = low, the on-chip reference buffer and band gap are powered down.

An external reference must be connected to REF and BVDD.

The exposed pad is not connected internally. For increased reliability of the solder joints, it is

recommended that the pad be soldered to the system ground plane.

1 AI = analog input, AI/O = bidirectional analog; DI = digital input, DO = digital output, and P = power.

Rev. B | Page 8 of 28

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