LTC1291 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1291' PDF : 20 Pages View PDF
LTC1291
TYPICAL PERFOR A CE CHARACTERISTICS
DOUT Delay Time vs Temperature
250
VCC = 5V
200
Maximum Clock Rate vs Source
Resistance
1.0
VCC = 5V
CLK = 1MHz
0.8
150 MSB-FIRST DATA
0.6
100
LSB-FIRST DATA
0.4
+VIN + +IN
RSOURCE– – –IN
50
0.2
Maximum Filter Resistor vs
Cycle Time
10k
RFILTER
+VIN
+
1k
CFILTER ≥1µF
–
100
10
0
–50 –25 0 25 50 75 100 125
AMBIENT TEMPERATURE (°C)
1291 G10
Sample-and-Hold Acquisition
Time vs Source Resistance
100
VCC = 5V
TA = 25°C
0V TO 5V INPUT STEP
10
+ RSOURCE+
VIN
–
1
100
1k
10k
RSOURCE+ (Ω)
1291 G13
0
100
1
1k
10k
100k
10
RSOURCE– (Ω)
1291 G11
100
1k
CYCLE TIME (µs)
10k
1291 G12
Input Channel Leakage Current
vs Temperature
1000
900
GUARANTEED
800
700
600
500
400
300
200
ON CHANNEL
100
OFF CHANNEL
0
–50 –30 –10 10 30 50 70 90 110 130
AMBIENT TEMPERATURE (°C)
1291 G14
* MAXIMUM CLK FREQUENCY REPRESENTS THE CLK
FREQUENCY AT WHICH A 0.1LSB SHIFT IN THE
ERROR AT ANY CODE TRANSITION FROM ITS 1MHz
VALUE IS FIRST DETECTED.
**MAXIMUM RFILTER REPRESENTS THE FILTER RESISTOR
VALUE AT WHICH A 0.1LSB CHANGE IN FULL SCALE
ERROR FROM ITS VALUE AT RFILTER = 0Ω IS FIRST
DETECTED.
PI FU CTIO S
# PIN
FUNCTION
DESCRIPTION
1
CS
Chip Select Input A logic low on this input enables the LTC1291.
2, 3 CH0, CH1 Analog Inputs
These inputs must be free of noise with respect to GND.
4
GND
Analog Ground
GND should be tied directly to an analog ground plane.
5
DIN
6
DOUT
7
CLK
Digital Data Input
Digital Data Output
Shift Clock
The multiplexer address is shifted into this input.
The A/D conversion result is shifted out of this output.
This clock synchronizes the serial data transfer.
8
VCC(VREF) Positive Supply and This pin provides power and defines the span of the A/D converter. This supply must be kept free of noise and
Reference Voltage ripple by bypassing directly to the analog ground plane.
5
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