FS9701B datasheet(20/46 Pages) FORTUNE

20 / 46 page

FS970X

Rev. 4.4

20/46

Multiplexers and pre-filter

Through multiplexers such as INHMUX, INLMUX, VRHMUX and VRLMUX, selectable ADC signals are FTIN,

INL, VRH, and VRL. FTIN and INL first flow through a RC pre-filter, and then into full differential amplifier

input INH and INL of ADC. At the same time, they can bypass the RC pre-filter and flow directly into ADC

through BPFTR and FTR.

Each output path is directly controlled by registers. Details are shown in Chart 9, Chart 10, Chart 11 and Chart

12.

Name SMV

SDV

SGND SDB

ACH

AX5 ADRF

SINH 0000

0001

0010

0011

0100

0101

0110

0111

Name ACBO CMPH AX1

AX2

AX3

AX4

LBS

SINH 1000

1001

1010

1011

1100

1101

1110

Chart 9

FTIN multiplexers setup

Name SGND SCV

SDV

ACL

SDB

AX2

AX3

AX4

SINL

000

001

010

011

100

101

110

111

Chart 10

INL multiplexers setup.

Name ADRF SDV

SMV

AX3

SRFH

Chart 11

VRH multiplexers setup.

Name AGND SCV

SDB

SMV

AX3

AX4 AGND

SRFL

000

001

010

011

100

101

110

Chart 12

VRL multiplexers setup.

The signal into the comparator can be selected by comparator multiplexers – CMPMUX. The path is controlled

by registers as well, as show below.

Name

SMV

SDV

ADRF

AX1

AX2

Vcntd Vsrc1

SCMPH

0000

0001

0010

0011

0100

0101

0110

0111

Name

Vcapd1 Vcapd2 Vcapc2 Vcapc1 SGND AGND VRH

VRL

SCMPH

1000

1001

1010

1011

1100

1101

1110

1111

Chart 13

CMPH multiplexers setup.

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