LTC1287BCN8 Linear Technology, LTC1287BCN8 Datasheet - Page 5

• Manufacturer Part Number: LTC1287BCN8
• Description: IC DATA ACQ SYS 12BIT 3V 8-DIP
• Manufacturer: Linear Technology
• Type: Data Acquisition System (DAS)r

Specifications of LTC1287BCN8

• Resolution (bits): 12 b
• Sampling Rate (per Second): 30k
• Data Interface: Serial, Parallel
• Voltage Supply Source: Single Supply
• Voltage - Supply: 3V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

PI FU CTIO S
TYPICAL PERFOR
* MAXIMUM CLK FREQUENCY REPRESENTS THE CLK FREQUENCY AT WHICH A 0.1LSB
SHIFT IN THE ERROR AT ANY CODE TRANSITION FROM ITS 500kHz VALUE IS FIRST DETECTED.
** AS THE CLK FREQUENCY IS DECREASED FROM 1MHz, MINIMUM CLK FREQUENCY
( ERROR 0.1LSB) REPRESENTS THE FREQUENCY AT WHICH A 0.1LSB SHIFT IN ANY
CODE TRANSITION FROM ITS 500kHz VALUE IS FIRST DETECTED.
CS (Pin 1): Chip Select Input. A logic low on this input
enables the LTC1287.
+IN, –IN (Pin 2,3): Analog Inputs. These inputs must be
free of noise with respect to GND.
GND (Pin 4): Analog Ground GND should be tied directly
to an analog ground plane.
V
the span of the A/D converter and must be kept free of
noise with respect to GND.
REF
500
400
300
200
100
100
10
U
0
1
100
100
(Pin 5): Reference Input. The reference input defines
Maximum Clock Rate vs Source
Resistance
Sample-and-Hold Acquisition
Time vs Source Resistance
V
V
T
0V TO 2.5V INPUT STEP
V
A
R
REF
CC
IN
SOURCE
+V
= 25 C
= 3V
R
IN
= 2.5V
SOURCE
U
–
+IN
–IN
+
1k
R
+
–
R
SOURCE
SOURCE
1k
U
– ( )
+ ( )
10k
V
V
CLK = 500kHz
CC
REF
= 3V
W
= 2.5V
LTC1287 G13
A
LTC G10
100k
U
10k
CE
C
1000
0.25
0.05
0.20
0.15
0.10
HARA TERISTICS
900
800
700
600
500
400
300
200
100
0
–50
–50
Minimum Clock Rate for 0.1LSB
Error**
Input Channel Leakage Current vs
Temperature
V
–30
CC
–25
= 3V
AMBIENT TEMPERATURE ( C)
–10
AMBIENT TEMPERATURE ( C)
C
10
0
30
25
OFF CHANNEL
D
result is shifted out of this output.
CLK (Pin 7): Shift Clock. This clock synchronizes the serial
data transfer.
V
of noise and ripple by bypassing directly to the analog
ground plane.
*** MAXIMUM R
50
CC
OUT
CHANGE IN FULL SCALE ERROR FROM ITS VALUE AT R
GUARANTEED
ON CHANNEL
(Pin 8): Positive Supply. This supply must be kept free
50
70
(Pin 6): Digital Data Output. The A/D conversion
90 110
75
LTC1287 G11
LTC1287 G14
FILTER
130
100
REPRESENTS THE FILTER RESISTOR VALUE AT WHICH A 0.1LSB
10k
100
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
1k
10
1
0
10
0
Maximum Filter Resistor vs Cycle
Time
Noise Error vs Reference Voltage
LTC1287 NOISE = 200 V
C
FILTER
V
0.5
IN
REFERENCE VOLTAGE (V)
R
FILTER
1 F
100
1.0
CYCLE TIME ( s)
FILTER
1.5
+
–
= 0 IS FIRST DETECTED.
LTC1287
P-P
1000
2.0
LTC1287 G12
2.5
LTC1287 G15
1287fa
5
10000
3.0