Datasheet
ADS1255
ADS1256
SBAS288K − JUNE 2003 − REVISED SEPTEMBER 2013
www.ti.com
5
PIN ASSIGNMENTS
SSOP PACKAGE
(TOP VIEW)
ADS1255 ADS1256
AVDD
AGND
VREFN
VREFP
AINCOM
AIN0
AIN1
SYNC, PDWN
RESET
DVDD
D1
D0/CLKOUT
SCLK
DIN
DOUT
DRDY
CS
XTAL1/CLKIN
XTAL2
DGND
AVDD
AGND
VREFN
VREFP
AINCOM
AIN0
AIN1
SYNC, PDWN
RESET
DVDD
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
D3
D1
D2
D0/CLKOUT
DIN
SCLK
DOUT
CS
DRDY
XTAL1/CLKIN
DGND
XTAL2
1
2
3
4
5
6
7
8
9
10 11
12
13
14
15
16
17
18
19
20
9
8
7
6
5
4
3
2
1
10
13
12
11
14
20
21
22
23
24
25
26
27
28
19
16
17
18
15
Terminal Functions
TERMINAL NO.
ANALOG/DIGITAL
NAME ADS1255 ADS1256
ANALOG/DIGITAL
INPUT/OUTPUT
DESCRIPTION
AVDD 1 1 Analog Analog power supply
AGND 2 2 Analog Analog ground
VREFN 3 3 Analog input Negative reference input
VREFP 4 4 Analog input Positive reference input
AINCOM 5 5 Analog input Analog input common
AIN0 6 6 Analog input Analog input 0
AIN1 7 7 Analog input Analog input 1
AIN2 — 8 Analog input Analog input 2
AIN3 — 9 Analog input Analog input 3
AIN4 — 10 Analog input Analog input 4
AIN5 — 11 Analog input Analog input 5
AIN6 — 12 Analog input Analog input 6
AIN7 — 13 Analog input Analog input 7
SYNC/PDWN 8 14 Digital input
(1)(2)
: active low Synchronization / power down input
RESET 9 15 Digital input
(1)(2)
: active low Reset input
DVDD 10 16 Digital Digital power supply
DGND 11 17 Digital Digital ground
XTAL2 12 18 Digital
(3)
Crystal oscillator connection
XTAL1/CLKIN 13 19 Digital/Digital input
(2)
Crystal oscillator connection / external clock input
CS 14 20 Digital input
(1)(2)
: active low Chip select
DRDY 15 21 Digital output: active low Data ready output
DOUT 16 22 Digital output Serial data output
DIN 17 23 Digital input
(1)(2)
Serial data input
SCLK 18 24 Digital input
(1)(2)
Serial clock input
D0/CLKOUT 19 25 Digital IO
(4)
Digital I/O 0 / clock output
D1 20 26 Digital IO
(4)
Digital I/O 1
D2 — 27 Digital IO
(4)
Digital I/O 2
D3 — 28 Digital IO
(4)
Digital I/O 3
(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.