Datasheet

ADS1246
ADS1247
ADS1248
www.ti.com SBAS426G –AUGUST 2008–REVISED OCTOBER 2011
ADS1248 (TSSOP-28) 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 0, or general-purpose digital input/output pin 0
Digital in/out
Analog input
REFN0/GPIO1 6 Negative external reference 0 input, or general-purpose digital input/output pin 1
Digital in/out
REFP1 7 Analog input Positive external reference 1 input
REFN1 8 Analog input Negative external reference 1 input
VREFOUT 9 Analog output Positive internal reference voltage output
Negative internal reference voltage output. Connect this pin to AVSS when using a unipolar
VREFCOM 10 Analog output
supply, or to the midvoltage of the power supply when using a bipolar supply.
AIN0/IEXC 11 Analog input Analog input 0, optional excitation current output
AIN1/IEXC 12 Analog input Analog input 1, optional excitation current output
Analog input
AIN4/IEXC/GPIO4 13 Analog input 4, optional excitation current output, or general-purpose digital input/output pin 4
Digital in/out
Analog input
AIN5/IEXC/GPIO5 14 Analog input 5, optional excitation current output, or general-purpose digital input/output pin 5
Digital in/out
Analog input
AIN6/IEXC/GPIO6 15 Analog input 6, optional excitation current output, or general-purpose digital input/output pin 6
Digital in/out
Analog input
AIN7/IEXC/GPIO7 16 Analog input 7, optional excitation current output, or general-purpose digital input/output pin 7
Digital in/out
Analog input
AIN2/IEXC/GPIO2 17 Analog input 2, optional excitation current output, or general-purpose digital input/output pin 2
Digital in/out
Analog input
AIN3/IEXC/GPIO3 18 Analog input 3, optional excitation current output, or general-purpose digital input/output pin 3
Digital in/out
IOUT2 19 Analog output Excitation current output 2
IOUT1 20 Analog output Excitation current output 1
AVSS 21 Analog Negative analog power supply
AVDD 22 Analog Positive analog power supply
START 23 Digital input Conversion start. See text for complete description.
CS 24 Digital input Chip select (active low)
DRDY 25 Digital output Data ready (active low)
Serial Data Out Output, or
DOUT/DRDY 26 Digital output
Data Out combined with Data Ready (active low when DRDY function enabled)
DIN 27 Digital input Serial data input
SCLK 28 Digital input Serial clock input
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Product Folder Link(s): ADS1246 ADS1247 ADS1248