Datasheet

DVDD
DGND
CLK
RESET
REFP0/GPIO0
REFN0/GPIO1
VREFOUT
VREFCOM
AIN0/IEXC
AIN1/IEXC
SCLK
DIN
DOUT/DRDY
DRDY
CS
START
AVDD
AVSS
AIN3/IEXC/GPIO3
AIN2/IEXC/GPIO2
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
ADS1247
ADS1246
ADS1247
ADS1248
SBAS426G –AUGUST 2008–REVISED OCTOBER 2011 www.ti.com
PW PACKAGE
TSSOP-20
(TOP VIEW)
ADS1247 (TSSOP-20) PIN DESCRIPTIONS
NAME PIN NO. FUNCTION DESCRIPTION
DVDD 1 Digital Digital power supply
DGND 2 Digital Digital ground
CLK 3 Digital input External clock input. Tie this pin to DGND to activate the internal oscillator.
RESET 4 Digital input Chip reset (active low). Returns all register values to reset values.
Analog input
REFP0/GPIO0 5 Positive external reference input, or general-purpose digital input/output pin 0
Digital in/out
Analog input
REFN0/GPIO1 6 Negative external reference input, or general-purpose digital input/output pin 1
Digital in/out
VREFOUT 7 Analog output Positive internal reference voltage output
Negative internal reference voltage output. Connect this pin to AVSS when using a unipolar
VREFCOM 8 Analog output
supply, or to the midvoltage of the power supply when using a bipolar supply.
AIN0/IEXC 9 Analog input Analog input 0, optional excitation current output
AIN1/IEXC 10 Analog input Analog input 1, optional excitation current output
Analog input
AIN2/IEXC/GPIO2 11 Analog input 2, optional excitation current output, or general-purpose digital input/output pin 2
Digital in/out
Analog input Analog input 3, with or without excitation current output, or general-purpose digital input/output
AIN3/IEXC/GPIO3 12
Digital in/out pin 3
AVSS 13 Analog Negative analog power supply
AVDD 14 Analog Positive analog power supply
START 15 Digital input Conversion start. See text for description of use.
CS 16 Digital input Chip select (active low)
DRDY 17 Digital output Data ready (active low)
Serial data out output, or
DOUT/DRDY 18 Digital output
Data out combined with Data Ready (active low when DRDY function enabled)
DIN 19 Digital input Serial data input
SCLK 20 Digital input Serial clock input
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Product Folder Link(s): ADS1246 ADS1247 ADS1248