ADC
AS1419
AS1419A
Austin Semiconductor, Inc.
TYPICAL PERFORMANCE CHARACTERISTICS (cont.)
TEST CIRCUITS
Load Circuits for Output Float Delay
Load Circuit for Access timings
PIN FUNCTIONS
+AIN (Pin 1): 2.5V PositiveAnalog Input.
–AIN (Pin 2): 2.5V NegativeAnalog Input.
CONVST\ (Pin 23): Conversion Start Signal. This active low
signal starts a conversion on its falling edge.
VREF (Pin 3): 2.5V Reference Output. Bypass toAGND with CS\ (Pin 24): Chip Select. The input must be low for theADC to
1µF.
recognize CONVST\ and RD\ inputs. CS\ also sets the
REFCOMP(Pin 4): 4.06V Reference Output. Bypass toAGND shutdown mode when SHDN\ goes low. CS\ and SHDN\ low
with 10μF tantalum in parallel with 0.1µF or 10µF ceramic.
AGND (Pin 5): Analog Ground.
select the quick wake-up nap mode. CS\ high and SHDN\ low
select sleep mode.
D13 to D6 (Pins 6 to 13): Three-State Data Outputs. The BUSY\ (Pin 25): The BUSY\ output shows the converter
output format is 2’s complement.
status. It is low when a conversion is in progress. Data valid on
DGND (Pin 14): Digital Ground for Internal Logic. Tie toAGND. the rising edge of BUSY\.
D5 to D0 (Pins 15 to 20): Three-State Data Outputs. The
output format is 2’s complement.
SHDN\ (Pin 21): Power Shutdown Input. Low selects
shutdown. Shutdown mode selected by CS\. CS\ = 0 for nap
mode and CS\ = 1 for sleep mode.
RD\ (Pin 22): Read Input. This enables the output drivers when
CS\ is low.
AS1419 & AS1419A
Rev. 1.5 08/09
VSS (Pin 26): – 5V Negative Supply. Bypass to AGND with
10µF tantalum in parallel with 0.1µF or 10µF ceramic.
DVDD (Pin 27): 5V Positive Supply. Short to Pin 28.
AVDD (Pin 28): 5V Positive Supply. Bypass toAGND with 10µF
tantalum in parallel with 0.1µF or 10µF ceramic.
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
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