ADS1255
ADS1256
www.ti.com
SBAS288D − JUNE 2003 − REVISED AUGUST 2004
PIN ASSIGNMENTS
SSOP PACKAGE
(TOP VIEW)
AVDD
AGND
VREFN
VREFP
AINCOM
AIN0
AIN1
SYNC, PDWN
RESET
1
2
3
4
5
6
7
8
9
20 D1
19 D0/CLKOUT
18 SCLK
17 DIN
AVDD
AGND
VREFN
VREFP
AINCOM
AIN0
AIN1
AIN2
AIN3
1
2
3
4
5
6
7
8
9
28 D3
27 D2
26 D1
25 D0/CLKOUT
24 SCLK
23 DIN
ADS1255
16 DOUT
15 DRDY
14 CS
13 XTAL1/CLKIN
12 XTAL2
11 DGND
ADS1256
22 DOUT
21 DRDY
20 CS
19 XTAL1/CLKIN
18 XTAL2
17 DGND
16 DVDD
15 RESET
AIN4 10
AIN5 11
AIN6 12
AIN7 13
SYNC, PDWN 14
DVDD 10
Terminal Functions
TERMINAL NO.
NAME
AVDD
AGND
VREFN
VREFP
AINCOM
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
SYNC/PDWN
RESET
DVDD
DGND
XTAL2
XTAL1/CLKIN
CS
DRDY
DOUT
DIN
SCLK
D0/CLKOUT
D1
D2
ADS1255
1
2
3
4
5
6
7
—
—
—
—
—
—
8
9
10
11
12
13
14
15
16
17
18
19
20
—
ADS1256
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
ANALOG/DIGITAL
INPUT/OUTPUT
Analog
Analog
Analog input
Analog input
Analog input
Analog input
Analog input
Analog input
Analog input
Analog input
Analog input
Analog input
Analog input
Digital input(1)(2): active low
Digital input(1)(2): active low
Digital
Digital
Digital(3)
Digital/Digital input(2)
Digital input(1)(2): active low
Digital output: active low
Digital output
Digital input(1)(2)
Digital input(1)(2)
Digital IO(4)
Digital IO(4)
Digital IO(4)
Analog power supply
Analog ground
Negative reference input
Positive reference input
Analog input common
Analog input 0
Analog input 1
Analog input 2
Analog input 3
Analog input 4
Analog input 5
Analog input 6
Analog input 7
Synchronization / power down input
Reset input
Digital power supply
Digital ground
Crystal oscillator connection
Crystal oscillator connection / external clock input
Chip select
Data ready output
Serial data output
Serial data input
Serial clock input
Digital I/O 0 / clock output
Digital I/O 1
Digital I/O 2
Digital I/O 3
DESCRIPTION
D3
—
28
Digital IO(4)
(1) Schmitt-Trigger digital input.
(2) 5V tolerant digital input.
(3) Leave disconnected if external clock input is applied to XTAL1/CLKIN.
(4) Schmitt-Trigger digital input when the digital I/O is configured as an input.
5
BURR-BROWN [ BURR-BROWN CORPORATION ]
