THS1041

SLAS289B – OCTOBER 2001 – REVISED FEBRUARY 2002

3

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Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

AGND

1

I

Analog ground

AIN+

27

I

Positive analog input

AIN–

25

I

Negative analog input

AVDD

28

I

Analog supply

CLAMP

19

I

High to enable clamp mode, low to disable clamp mode

CLAMPIN

20

I

Connect to an external analog clamp reference input.

CLAMPOUT

21

O

The CLAMPOUT pin can provide a dc restoration or a bias source function (see AC reference generation

section). If neither function is required then the clamp can be disabled to save power (see power management

section).

CLK

15

I

Clock input

DGND

14

I

Digital ground

DVDD

2

I

Digital supply

I/O0

I/O1

I/O2

I/O3

I/O4

I/O5

I/O6

I/O7

I/O8

I/O9

3

4

5

6

7

8

9

10

11

12

I/O

Digital I/O bit 0 (LSB)

Digital I/O bit 1

Digital I/O bit 2

Digital I/O bit 3

Digital I/O bit 4

Digital I/O bit 5

Digital I/O bit 6

Digital I/O bit 7

Digital I/O bit 8

Digital I/O bit 9 (MSB)

MODE

23

I

Operating mode select (AGND, AVDD/2, AVDD)

OE

16

I

High to high-impedance state the data bus, low to enable the data bus

OVR

13

O

Out-of-range indicator

REFB

24

I/O

Bottom ADC reference voltage

REFSENSE

18

I

VREF mode control

REFT

22

I/O

Top ADC reference voltage

VREF

26

I/O

Internal or external reference

WR

17

I

Write strobe