Datasheet

ADS7229
ADS7230
www.ti.com ............................................................................................................................................................... SBAS437A – MAY 2008 – REVISED JUNE 2009
ADS7229 Terminal Functions
NO.
NAME QFN TSSOP I/O DESCRIPTION
AGND 15 5 — Analog ground
BDGND 8 14 — Interface ground
CONVST 3 9 I Freezes sample-and-hold, starts conversion with next rising edge of internal clock
Status output. If programmed as EOC, this pin is low (default) when a conversion is in
progress. If programmed as an interrupt ( INT), this pin is low for a preprogrammed
EOC/ INT/CDI 4 10 I/O duration after the end of conversion and valid data are to be output. The polarity of
EOC or INT is programmable. This pin can also be used as a chain data input when
the device is operated in daisy-chain mode.
Frame sync signal for TMS320 DSP serial interface or chip select input for SPI
FS/ CS 5 11 I
interface slave select (SS – ).
+IN 13 3 I Noninverting input
– IN 14 4 I Inverting input; usually connected to ground
NC 2 8 — No connection
REF+ (REFIN) 1 7 I External reference input
REF – 16 6 I Connect to AGND through individual via
RESERVED 12 2 I Connect to AGND or +VA
SCLK 9 15 I Clock for serial interface
SDI 6 12 I Serial data in
SDO 7 13 O Serial data out
+VA 11 1 Analog supply, +2.7V to +5.5VDC
+VBD 10 16 Interface supply
ADS7230 Terminal Functions
NO.
NAME QFN TSSOP I/O DESCRIPTION
AGND 15 5 — Analog ground
BDGND 8 14 — Interface ground
COM 14 4 I Common inverting input; usually connected to ground
CONVST 3 9 I Freezes sample-and-hold, starts conversion with next rising edge of internal clock
Status output. If programmed as EOC, this pin is low (default) when a conversion is in
progress. If programmed as an interrupt ( INT), this pin is low for a preprogrammed
EOC/ INT/CDI 4 10 I/O duration after the end of conversion and valid data are to be output. The polarity of
EOC or INT is programmable. This pin can also be used as a chain data input when
the device is operated in daisy-chain mode.
Frame sync signal for TMS320 DSP serial interface or chip select input for SPI
FS/ CS 5 11 I
interface
+IN1 12 2 I Second noninverting input
+IN0 13 3 I First noninverting input
NC 2 8 — No connection.
REF+ (REFIN) 1 7 I External reference input
REF – 16 6 I Connect to AGND through individual via
SCLK 9 15 I Clock for serial interface
SDI 6 12 I Serial data in (conversion start and reset possible)
SDO 7 13 O Serial data out
+VA 11 1 Analog supply, +2.7V to +5.5VDC
+VBD 10 16 Interface supply
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Product Folder Link(s): ADS7229 ADS7230