SH79F6489PSLASH080PR datasheet(109/152 Pages) SINOWEALTH

109 / 152 page

SH79F6488/SH79F6489

109

8.7 Programmable Gain Amplifier (PGA)

8.7.1 Features

 Low noise programmable gain amplifier

 8-level Programmable gain range

 Chopper

The SH79F6488/SH79F6489 provides a low noise programmable gain amplifier. This PGA provides amplification setting of 1,

2, 4, 8, 16, 32, 64 and 128. A chopper is included, which can be used for eliminate PGA offset. Chopper work clock can select

1kHz, 2kHz, 3kHz, or 4kHz. Work clock of 1kHz is recommended.

PGA

ADC

module

CH-

CH+

GAIN [3:0]

REF

VIN+

VIN-

8.7.2 Registers

Table 8.31 PGA Mode Control Register

A3H

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

PGAM

GAIN3

GAIN2

GAIN1

GAIN0

VINON

CHOP

CHOPC1

CHOPC0

R/W

Reset Value

(POR/WDT/LVR/PIN)

Bit Number

Bit Mnemonic

Description

7-4

GAIN[3:0]

PGA Gain select bits

0000: gain = 1

0001: gain = 2

0010: gain = 4

0110: gain = 8

1000: gain = 16

1001: gain = 32

1010: gain = 64

1110: gain = 128

others: gain = 1

VINON

VIN analog input enable bit

0: Disable analog input, analog input from AINx± or ANx

1: Enable analog input, analog input from VIN±, AINx± or ANx used as I/O

CHOP

Chopper Enable bit

0: Disable chopper function

1: Enable chopper function

1-0

CHOPC[1:0]

Chopper Work Clock Select bit

00: 1kHz

01: 2kHz

10: 3kHz

11: 4kHz

Work clock of 1kHz is recommended

SH79F6489P/080PR Datasheet(PDF) 109 Page - SINOWEALTH Electronic Ltd

SH79F6489P/080PR Datasheet(HTML) 109 Page - SINOWEALTH Electronic Ltd

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