AD7952

Rev. 0 | Page 8 of 32

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

AGND

AVDD

AGND

BYTESWAP

OB/2C

SER/PAR

NC = NO CONNECT

NC

NC

D0/DIVSCLK[0]

D1/DIVSCLK[1]

IMPULSE

WARP

BIPOLAR

CNVST

PD

RESET

CS

RD

TEN

BUSY

D13/SCCS

D12/SCCLK

D11/SCIN

D10/HW/SW

48 47 46 45 44 43 42 41 40 39 38 37

35

34

33

30

31

32

36

29

28

27

25

26

2

3

4

7

6

5

1

8

9

10

12

11

13 14 15 16 17 18 19 20 21 22 23 24

PIN 1

AD7952

TOP VIEW

(Not to Scale)

Figure 4. Pin Configuration

Table 6. Pin Function Descriptions

Pin No.

Mnemonic

Type1

Description

1, 3, 42

AGND

P

Analog Power Ground Pins. Ground reference point for all analog I/O. All analog I/O should be

referenced to AGND and should be connected to the analog ground plane of the system. In addition,

the AGND, DGND, and OGND voltages should be at the same potential.

2, 44

AVDD

P

Analog Power Pins. Nominally 4.75 V to 5.25 V and decoupled with 10 μF and 100 nF capacitors.

4

BYTESWAP

DI

Parallel Mode Selection (8 Bit/14 Bit). When high, the LSB is output on D[15:8] and the MSB is output

on D[7:0]; when low, the LSB is output on D[7:0] and the MSB is output on D[15:8].

5

OB/2C

DI2

Straight Binary/Binary Twos Complement Output. When high, the digital output is straight binary.

When low, the MSB is inverted resulting in a twos complement output from its internal shift register.

6

WARP

DI2

Conversion Mode Selection. Used in conjunction with the IMPULSE input per the following.

Conversion Mode

WARP

IMPULSE

Normal

Low

Low

Impulse

Low

High

Warp

High

Low

Normal

High

High

See the Modes of Operation section for a more detailed description.

7

IMPULSE

DI2

Conversion Mode Selection. See the WARP pin description in this table. See the Modes of Operation

section for a more detailed description.

8

SER/PAR

DI

Serial/Parallel Selection Input.

When SER/PAR = low, the parallel mode is selected.

When SER/PAR = high, the serial modes are selected. Some bits of the data bus are used as a serial

port, and the remaining data bits are high impedance outputs.

9, 10

NC

DO

No Connect. Do not connect.

11, 12

D[0:1] or

DI/O

In parallel mode, these outputs are used as Bit 0 and Bit 1 of the parallel port data output bus.

DIVSCLK[0:1]

Serial Data Division Clock Selection. In serial master read after convert mode (SER/PAR = high,

EXT/INT = low, RDC/SDIN = low), these inputs can be used to slow down the internally generated serial

data clock that clocks the data output. In other serial modes, these pins are high impedance outputs.