Datasheet
AD7952 Data Sheet
Rev. A | Page 8 of 32
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
PDBUF
PDREF
REFBUFIN
TEMP
AVDD
IN+
AGND
VEE
VCC
IN–
REFGND
REF
D2/EXT/INT
D3/INVSYNC
D4/INVSCLK
D5/RDC/SDIN
OGND
OVDD
DVDD
DGND
D6/SDOUT
D7/SDCLK
D8/SYNC
D9/RDERROR
AGND
AVDD
AGND
BYTESWAP
OB/2C
SER/PAR
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)
06589-004
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 Type
1
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 F 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
DI
2
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 DI
2
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 DI
2
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.