LTC1420_15 Datasheet, PDF (7/20 Pages) Linear Technology – 12-Bit, 10Msps, Sampling ADC

LTC1420
PIN FUNCTIONS
V_DD (Pin 23): Analog 5V Supply. Bypass to GND with a 1µF
ceramic.
GND (Pin 24): Analog Power Ground.
V_SS (Pin 25): Negative Supply. Can be – 5V or 0V. If V_SS is
not shorted to GND, bypass to GND with a 1µF ceramic.
CLK (Pin 26): Conversion Start Signal. This active high
signal starts a conversion on its rising edge.
OF (Pin 27): Overflow Output. This signal is high when the
digital output is 011111111111 or 100000000000.
GAIN (Pin 28): Gain Select for Input PGA. 5V selects an
input gain of 1, 0V selects a gain of 2.
W
FUNCTIONAL BLOCK DIAGRA
+A_IN
–A_IN
V_CM
SENSE
GAIN
S/H
MODE SELECT
V_REF
V_SS
0V OR –5V
5V
V_DD
V_DD
OPTIONAL 3V
LOGIC SUPPLY
(PIN 7) (PIN 23) OV_DD
PIPELINED 12-BIT ADC
DIGITAL CORRECTION
LOGIC
2.5V
REFERENCE
2.048V
OUTPUT
BUFFERS
OF
D11 (MSB)
D0 (LSB)
CLK
GND
(PIN 6)
GND
(PIN 8)
GND
OGND
(PIN 24)
1420 BD
WU
W
TI I G DIAGRA
ANALOG
INPUT
CLK
DATA
OUTPUT
N+1
N
t_CLOCK
t_H
t_L
N+2
N+3
t_CONV
N–3
t_ACQ
N–2
N–1
N
1420 TD
1420fa
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