Datasheet

ADS1146
ADS1147
ADS1148
www.ti.com SBAS453F –JULY 2009–REVISED APRIL 2012
ADS1148 (QFN-32) PIN DESCRIPTIONS
NAME PIN NO. FUNCTION DESCRIPTION
DIN 1 Digital input Serial data input
SCLK 2 Digital input Serial clock input
NC 3 Not connected Pin can be grounded or left disconnected
NC 4 Not connected Pin can be grounded or left disconnected
NC 5 Not connected Pin can be grounded or left disconnected
NC 6 Not connected Pin can be grounded or left disconnected
DVDD 7 Digital Digital power supply
DGND 8 Digital Digital ground
CLK 9 Digital input External clock input. Tie this pin to DGND to activate the internal oscillator.
RESET 10 Digital input Chip reset (active low). Returns all register values to reset values.
Analog input;
REFP0/GPIO0 11 Positive external reference input 0, or general-purpose digital input/output pin 1
Digital in/out
Analog input;
REFN0/GPIO1 12 Negative external reference input 0, or general-purpose digital input/output pin 1
Digital in/out
REFP1 13 Analog input Positive external reference 1 input
REFN1 14 Analog input Negative external reference 1 input
VREFOUT 15 Analog output Positive internal reference voltage output
Negative internal reference voltage output. Connect this pin to AVSS when using a unipolar
VREFCOM 16 Analog output
supply, or to the midvoltage of the power supply when using a bipolar supply.
AIN0/IEXC 17 Analog input Analog input 0, optional excitation current output
AIN1/IEXC 18 Analog input Analog input 1, optional excitation current output
Analog input;
AIN4/IEXC/GPIO4 19 Analog input 4, optional excitation current output, or general-purpose digital input/output pin 4
Digital in/out
Analog input;
AIN5/IEXC/GPIO5 20 Analog input 5, optional excitation current output, or general-purpose digital input/output pin 5
Digital in/out
Analog input;
AIN6/IEXC/GPIO6 21 Analog input 6, optional excitation current output, or general-purpose digital input/output pin 6
Digital in/out
Analog input;
AIN7/IEXC/GPIO7 22 Analog input 7, optional excitation current output, or general-purpose digital input/output pin 7
Digital in/out
Analog input;
AIN2/IEXC/GPIO2 23 Analog input 2, optional excitation current output, or general-purpose digital input/output pin 2
Digital in/out
Analog input;
AIN3/IEXC/GPIO3 24 Analog input 3, optional excitation current output, or general-purpose digital input/output pin 3
Digital in/out
IEXC2 25 Analog output Excitation current output 2
IEXC1 26 Analog output Excitation current output 1
AVSS 27 Analog Negative analog power supply
AVDD 28 Analog Positive analog power supply
START 29 Digital input Conversion start. See text for complete description.
Digital input Chip
CS 30 Chip select (active low)
select (active low)
DRDY 31 Digital output Data ready (active low)
Serial data output, or data out combined with data ready (active low when DRDY function
DOUT/DRDY 32 Digital output
enabled)
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