7
LTC1286/LTC1298
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
TEMPERATURE (°C)
–55
CLOCK FREQUENCY (kHz)
100
150
25 45 65 85
LT1286/98 • G14
50
0
–35
–15
5
200
V
CC
= V
REF
= 5V
SUPPLY VOLTAGE (V)
3
1
DIGITAL LOGIC THRESHOLD VOLTAGE (V)
2
3
4567
LTC 1286/98 G17
89
T
A
= 25°C
TEMPERATURE (°C)
–60
LEAKAGE CURRENT (nA)
1000
100
10
1
0.1
0.01
100
1196/98 G19
–20
20
60
140
–40
0
40 80
120
V
CC
= 5V
V
REF
= 5V
ON CHANNEL
OFF CHANNEL
Input Channel Leakage Current
vs Temperature
Digital Input Logic Threshold
vs Supply Voltage
Minimum Clock Frequency
for 0.1 LSB Error vs Temperature
PIN FUNCTIONS
UUU
LTC1286
V
REF
(Pin 1): Reference Input. The reference input defines
the span of the A/D converter.
IN
+
(Pin 2): Positive Analog Input.
IN
–
(Pin 3): Negative Analog Input.
GND (Pin 4): Analog Ground. GND should be tied directly
to an analog ground plane.
CS/SHDN (Pin 5): Chip Select Input. A logic low on this
input enables the LTC1286. A logic high on this input
disables and powers down the LTC1286.
D
OUT
(Pin 6): Digital Data Output. The A/D conversion
result is shifted out of this output.
CLK (Pin 7): Shift Clock. This clock synchronizes the serial
data transfer and determines conversion speed.
V
CC
(Pin 8): Power Supply Voltage. This pin provides
power to the A/D converter. It must be kept free of noise
and ripple by bypassing directly to the analog ground
plane.
LTC1298
CS/SHDN (Pin 1): Chip Select Input. A logic low on this
input enables the LTC1298. A logic high on this input
disables and powers down the LTC1298.
CH0 (Pin 2): Analog Input.
CH1 (Pin 3): Analog Input.
GND (Pin 4): Analog Ground. GND should be tied directly
to an analog ground plane.
D
IN
(Pin 5): Digital Data Input. The multiplexer address is
shifted into this input.
D
OUT
(Pin 6): Digital Data Output. The A/D conversion
result is shifted out of this output.
CLK (Pin 7): Shift Clock. This clock synchronizes the
serial data transfer and determines conversion speed.
V
CC
/V
REF
(Pin 8): Power Supply and Reference Voltage.
This pin provides power and defines the span of the A/D
converter. It must be kept free of noise and ripple by
bypassing directly to the analog ground plane.
