
8
LTC1404
1404fa
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Unipolar Mode VCC 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
fSAMPLE = 600kHz
TEMPERATURE (
°C)
–50
V
CC
SUPPLY
CURRENT
(mA)
V
SS
SUPPLY
CURRENT
(
A)
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
VCC CURRENT
VSS CURRENT
fSAMPLE = 600kHz
Bipolar Mode Supply Current
vs Temperature
PIN FUNCTIONS
UU
U
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.
VSS (Pin 8): Negative Supply. –5V for bipolar operation.
Bypass to GND with 10
F tantalum in parallel with 0.1F
ceramic. VSS should be tied to GND for unipolar operation.
VCC (Pin 1): Positive Supply, 5V. Bypass to GND (10F
tantalum in parallel with 0.1
F ceramic).
AIN (Pin2):AnalogInput.0Vto4.096V(Unipolar),±2.048V
(Bipolar).
VREF (Pin 3): 2.43V Reference Output. Bypass to GND
(10
F tantalum in parallel with 0.1F ceramic).
GND (Pin 4): Ground. GND should be tied directly to an
analog ground plane.
DOUT (Pin 5): The A/D conversion result is shifted out from
this pin.