Datasheet

ADS8331
ADS8332
www.ti.com SBAS363C –DECEMBER 2009–REVISED MAY 2012
ADS8331 PIN DESCRIPTIONS
PIN NO.
NAME TSSOP QFN I/O DESCRIPTION
ADCIN 21 18 I ADC input
AGND 20 17 – Analog ground
DGND 14 11 – Digital interface ground
COM 23 20 I Common ADC input (usually connected to AGND)
CONVST 15 12 I Conversion start. Freezes sample and hold, starts conversion.
Status output. If programmed as end-of-conversion (EOC), this pin is low (default) when a
conversion is in progress. If programmed as an interrupt (INT), this pin is low (default) after
EOC/INT/CDI 9 6 O/O/I the end of conversion and returns high after FS/CS goes low. The polarity of EOC or INT is
programmable.
This pin can also be used as a chain data input (CDI) when operated in daisy-chain mode.
FS/CS 11 8 I Frame sync signal for DSP (such as TMS320™ DSP) or chip select input for SPI.
IN
[0:3]
1-3, 24 21-24 I Mux inputs
NC 4-7 1-4 – No connection
MUXOUT 22 19 O Mux output
REF+ 18 15 I External reference input
External reference ground (connect to AGND through an individual via on the printed circuit
REF– 19 16 –
board)
RESET 8 5 I External reset (active low)
SCLK 10 7 I SPI clock for serial interface
SDI 12 9 I SPI serial data in
SDO 13 10 O SPI serial data out
VA 17 14 – Analog supply, +2.7V to +5.5V
VBD 16 13 – Digital interface supply
ADS8332 PIN DESCRIPTIONS
PIN NO.
NAME TSSOP QFN I/O DESCRIPTION
ADCIN 21 18 I ADC input
AGND 20 17 – Analog ground
DGND 14 11 – Digital interface ground
COM 23 20 I Common ADC input (usually connected to AGND)
CONVST 15 12 I Conversion start. Freezes sample and hold, starts conversion.
Status output. If programmed as end-of-conversion (EOC), this pin is low (default) when a
conversion is in progress. If programmed as an interrupt (INT), this pin is low (default) after
EOC/INT/CDI 9 6 O/O/I the end of conversion and returns high after FS/CS goes low. The polarity of EOC or INT is
programmable.
This pin can also be used as a chain data input (CDI) when operated in daisy-chain mode.
FS/CS 11 8 I Frame sync signal for DSP (such as TMS320™ DSP) or chip select input for SPI.
IN
[0:7]
1-7, 24 1-4, 21- Mux inputs
I
24
MUXOUT 22 19 O Mux output
REF+ 18 15 I External reference input
External reference ground (connect to AGND through an individual via on the printed circuit
REF– 19 16 –
board)
RESET 8 5 I External reset (active low)
SCLK 10 7 I SPI clock for serial interface
SDI 12 9 I SPI serial data in
SDO 13 10 O SPI serial data out
VA 17 14 – Analog supply, +2.7 V to +5.5 V
VBD 16 13 – Digital interface supply
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