LTC1292 LINER [Linear Technology], LTC1292 Datasheet - Page 6

• Manufacturer Part Number: LTC1292
• Description: Single Chip 12-Bit Data Acquisition Systems
• Manufacturer: LINER [Linear Technology]

LTC1292/LTC1297
TYPICAL PERFOR
PI FU CTIO S
6
#
1
2, 3
4
5
6
7
8
1000
600
900
800
700
500
400
300
200
100
1.0
0.4
0.8
0.6
0.2
U
0
0
100
–50
Input Channel Leakage Current vs
Temperature
Maximum Clock Rate vs
Source Resistance
PIN
CS
+IN, –IN
GND
V
D
CLK
V
–30
REF
CC
OUT
AMBIENT TEMPERATURE (°C)
–10
U
10
1k
R
FUNCTION
Chip Select Input
Analog Inputs
Analog Ground
Reference Input
Digital Data Output
Shift Clock
Positive Supply
SOURCE
30
OFF CHANNEL
50
U
– ( )
R
+V
SOURCE
ON CHANNEL
IN
GUARANTEED
10k
70
V
V
CLK = 1MHz
CC
REF
W
+
–
90 110
LTC1292/7 G16
= 5V
LTC1292/7G13
+IN
–IN
= 5V
A
U
100k
130
DESCRIPTION
A logic low on this input enables the LTC1292/LTC1297. Power shutdown is activated on the LTC1297 when
CS is brought high.
These inputs must be free of noise with respect to GND.
GND should be tied directly to an analog ground plane.
The reference input defines the span of the A/D converter and must be kept free of noise with respect to GND.
The A/D conversion result is shifted out of this output.
This clock synchronizes the serial data transfer.
This supply must be kept free of noise and ripple by bypassing directly to the analog ground plane.
CE
C
2.25
1.75
1.50
1.25
1.00
0.50
2.00
0.75
0.25
HARA TERISTICS
10k
100
1k
10
1
0
10
0
Maximum Filter Resistor vs
Cycle Time
Noise Error vs Reference Voltage
LTC1292/LTC1297
NOISE = 200µV
C
+V
FILTER
IN
1
C
REFERENCE VOLTAGE (V)
R
FILTER
1µF
100
CYCLE TIME (µs)
P-P
2
+
–
3
1k
LTC1292/7 G14
4
LTC1292/7 G17
10k
5
100
10
** MAXIMUM R
1
100
* MAXIMUM CLK FREQUENCY REPRESENTS THE
Sample-and-Hold Acquisition
Time vs Source Resistance
CLK FREQUENCY AT WHICH A 0.1LSB SHIFT IN
THE ERROR AT ANY CODE TRANSITION FROM ITS
1MHz VALUE IS FIRST DETECTED.
RESISTOR VALUE AT WHICH A 0.1LSB CHANGE IN
FULL SCALE ERROR FROM ITS VALUE AT
R
FILTER
V
V
T
0V TO 5V INPUT STEP
REF
CC
A
= 25°C
= 5V
= 0 IS FIRST DETECTED.
= 5V
+V
IN
FILTER
R
SOURCE
R
SOURCE
REPRESENTS THE FILTER
1000
+
–
+ ( )
LTC1292/7 G15
10000