AD2S1210
Rev. A | Page 9 of 36
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
48
RE
S
0
47
RE
F
O
U
T
46
RE
F
BY
P
45
CO
S
44
CO
S
L
O
43
AV
DD
42
SI
N
L
O
41
SI
N
40
AG
ND
39
EX
C
38
EX
C
37
A0
35
DOS
34
LOT
33
RESET
30
B
31
NM
32
DIR
36
A1
29
A
28
DB0
27
DB1
25
DB3
26
DB2
2
CS
3
RD
4
WR/FSYNC
7
CLKIN
6
DVDD
5
DGND
1
RES1
8
XTALOUT
9
SOE
10
SAMPLE
12
DB14/SDI
11
DB15/SDO
13
DB13/
S
C
L
K
14
DB12
15
DB
11
16
DB10
17
DB9
18
V
DR
IV
E
19
DG
ND
20
DB8
21
DB7
22
DB6
23
DB5
24
DB4
PIN 1
AD2S1210
TOP VIEW
(Not to Scale)
07
46
7-
0
02
Figure 2. Pin Configuration
Table 4. Pin Function Descriptions
Pin
No.
Mnemonic
Description
1
RES1
Resolution Select 1. Logic input. RES1 in conjunction with RES0 allows the resolution of the AD2S1210 to be
2
CS
Chip Select. Active low logic input. The device is enabled when CS is held low.
3
RD
Edge-Triggered Logic Input. When the SOE pin is high, this pin acts as a frame synchronization signal and output
enable for the parallel data outputs, DB15 to DB0. The output buffer is enabled when CS and RD are held low. When
the SOE pin is low, the RD pin should be held high.
4
WR/FSYNC
Edge-Triggered Logic Input. When the SOE pin is high, this pin acts as a frame synchronization signal and input
enable for the parallel data inputs, DB7 to DB0. The input buffer is enabled when CS and WR/FSYNC are held low.
When the SOE pin is low, the WR/FSYNC pin acts as a frame synchronization signal and enable for the serial data bus.
5, 19
DGND
Digital Ground. These pins are ground reference points for digital circuitry on the AD2S1210. Refer all digital input
signals to this DGND voltage. Both of these pins can be connected to the AGND plane of a system. The DGND and
AGND voltages should ideally be at the same potential and must not be more than 0.3 V apart, even on a transient basis.
6
DVDD
Digital Supply Voltage, 4.75 V to 5.25 V. This is the supply voltage for all digital circuitry on the AD2S1210. The AVDD and DVDD
voltages ideally should be at the same potential and must not be more than 0.3 V apart, even on a transient basis.
7
CLKIN
Clock Input. A crystal or oscillator can be used at the CLKIN and XTALOUT pins to supply the required clock frequency of
the AD2S1210. Alternatively, a single-ended clock can be applied to the CLKIN pin. The input frequency of the AD2S1210 is
specified from 6.144 MHz to 10.24 MHz.
8
XTALOUT
Crystal Output. When using a crystal or oscillator to supply the clock frequency to the AD2S1210, apply the crystal
across the CLKIN and XTALOUT pins. When using a single-ended clock source, the XTALOUT pin should be
considered a no connect pin.
9
SOE
Serial Output Enable. Logic input. This pin enables either the parallel or serial interface. The serial interface is selected
by holding the SOE pin low, and the parallel interface is selected by holding the SOE pin high.
10
SAMPLE
Sample Result. Logic input. Data is transferred from the position and velocity integrators to the position and velocity
registers, after a high-to-low transition on the SAMPLE signal. The fault register is also updated after a high-to-low
transition on the SAMPLE signal.
11
DB15/SDO
Data Bit 15/Serial Data Output Bus. When the SOE pin is high, this pin acts as DB15, a three-state data output pin
controlled by CS and RD. When the SOE pin is low, this pin acts as SDO, the serial data output bus controlled by CS and
WR/FSYNC. The bits are clocked out on the rising edge of SCLK.
12
DB14/SDI
Data Bit 14/Serial Data Input Bus. When the SOE pin is high, this pin acts as DB14, a three-state data output pin controlled
by CS and RD. When the SOE pin is low, this pin acts as SDI, the serial data input bus controlled by CS and WR/FSYNC. The
bits are clocked in on the falling edge of SCLK.