AD7951BSTZ(2015) Ver la hoja de datos (PDF) - Analog Devices

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AD7951BSTZ
(Rev.:2015)

14-Bit, 1 MSPS, Unipolar/Bipolar Programmable Input PulSAR® ADC

Analog Devices 

AD7951

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

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

AGND 1

AVDD 2

AGND 3

BYTESWAP 4

OB/2C 5

WARP 6

IMPULSE 7

SER/PAR 8

NC 9

NC 10

D0/DIVSCLK[0] 11

D1/DIVSCLK[1] 12

PIN 1

AD7951

TOP VIEW

(Not to Scale)

36 BIPOLAR

35 CNVST

34 PD

33 RESET

32 CS

31 RD

30 TEN

29 BUSY

28 D13/SCCS

27 D12/SCCLK

26 D11/SCIN

25 D10/HW/SW

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

Data Sheet

NOTES

1. NC = NO CONNECT.

2. FOR THE LEAD FRAME CHIP SCALE PACKAGE (LFCSP), THE EXPOSED

PAD SHOULD BE CONNECTED TO VEE. THIS CONNECTION IS NOT

REQUIRED TO MEET THE ELECTRICAL PERFORMANCES.

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 the previous row of 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.

Rev. B | Page 8 of 32

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