8
LTC1404
1404fa
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Unipolar Mode V
CC
Supply Current
vs Temperature
TEMPERATURE (°C)
–50
V
CC
SUPPLY CURRENT (mA)
20
15
10
5
0
–25 0 25
1404 G23
50 75 100 125
f
SAMPLE
= 600kHz
TEMPERATURE (°C)
–50
V
CC
SUPPLY CURRENT (mA)
V
SS
SUPPLY CURRENT (µA)
15.0
12.5
10.0
7.5
5.0
2.5
0
300
250
200
150
100
50
0
–25 0 25
1404 G24
50 75 100 125
V
CC
CURRENT
V
SS
CURRENT
f
SAMPLE
= 600kHz
Bipolar Mode Supply Current
vs Temperature
PIN FUNCTIONS
UUU
CLK (Pin 6): Clock. This clock synchronizes the serial data
transfer. A minimum CLK pulse of 40ns signals the ADC to
wake up from Nap or Sleep mode.
CONV (Pin 7): Conversion Start Signal. This active high
signal starts a conversion on its rising edge. Keeping CLK
low and pulsing CONV two/four times will put the ADC into
Nap/Sleep mode.
V
SS
(Pin 8): Negative Supply. –5V for bipolar operation.
Bypass to GND with 10µF tantalum in parallel with 0.1µF
ceramic. V
SS
should be tied to GND for unipolar operation.
V
CC
(Pin 1): Positive Supply, 5V. Bypass to GND (10µF
tantalum in parallel with 0.1µF ceramic).
A
IN
(Pin 2): Analog Input. 0V to 4.096V (Unipolar), ±2.048V
(Bipolar).
V
REF
(Pin 3): 2.43V Reference Output. Bypass to GND
(10µF tantalum in parallel with 0.1µF ceramic).
GND (Pin 4): Ground. GND should be tied directly to an
analog ground plane.
D
OUT
(Pin 5): The A/D conversion result is shifted out from
this pin.
