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SBAS306A − NOVEMBER 2004 − REVISED DECEMBER 2004
PIN ASSIGNMENTS
TSSOP (PW) PACKAGE
(TOP VIEW)
AINP
AINN
1
2
3
4
5
6
7
8
16 VREFP
15 VREFN
AGND
14 DGND
13 DVDD
AVDD
ADS1271
MODE
12 CLK
FORMAT
SYNC/PDWN
DIN
11 SCLK
10 DRDY/FSYNC
9
DOUT
Terminal Functions
PIN
NAME
NO.
FUNCTION
DESCRIPTION
AINP
1
Analog Input
Positive analog input
AINN
2
3
4
5
Analog Input
Analog Input
Analog Input
Digital Input
Negative analog input
Analog ground
AGND
AVDD
MODE
Analog supply
MODE = 0:
High-Speed mode
MODE = float: High-Resolution mode
MODE = 1:
Low-Power mode
FORMAT
6
Digital Input
FORMAT = 0: SPI
FORMAT = 1: Frame-Sync
SYNC/PDWN
DIN
7
8
Digital Input
Digital Input
Synchronize/Power-down input, active low
Data input for daisy-chain operation
DOUT
9
Digital Output Data output
DRDY/FSYNC
10
Digital
If FORMAT = 0 (SPI), then pin 10 = DRDY output
Input/Output
If FORMAT = 1 (Frame-Sync), then pin 10 = FSYNC input
Serial clock for data retrieval
Master clock
SCLK
CLK
11
12
13
14
15
16
Digital Input
Digital Input
Digital Input
Digital Input
Analog Input
Analog Input
DVDD
DGND
VREFN
VREFP
Digital supply
Digital ground
Negative reference input
Positive reference input
5
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