LTC1292 LINER [Linear Technology], LTC1292 Datasheet - Page 4

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

DIGITAL A D DC ELECTRICAL CHARACTERISTICS
LTC1292/LTC1297
The
range; all other limits and typicals T
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All voltage values are with respect to ground (unless otherwise
noted).
Note 3: V
Note 4: One LSB is equal to V
= 5V, 1LSB = 5V/4096 = 1.22mV.
Note 5: Linearity error is specified between the actual end points of the
A/D transfer curve. The deviation is measured from the center of the
quantization band.
Note 6: Recommended operating conditions.
Note 7: Two on-chip diodes are tied to each reference and analog input
which will conduct for reference or analog input voltages one diode drop
SYMBOL
I
I
TYPICAL PERFOR
4
CC
REF
10
8
6
4
2
0
denotes specifications which apply over the operating temperature
4
Supply Current vs Supply Voltage
CC
CLK = 1MHz
T
A
= 25°C
= 5V, V
PARAMETER
Positive Supply Current
Reference Current
SUPPLY VOLTAGE (V)
REF
U
= 5V, CLK = 1.0MHz unless otherwise specified.
5
REF
divided by 4096. For example, when V
A
W
= 25 C.
LTC1292/7 G01
A
CONDITIONS
CS High
CS Low
CS High
Power
Shutdown
CLK Off
CS High
U
6
CE
C
HARA TERISTICS
10
9
6
5
4
3
8
7
–50
Supply Current vs Temperature
LTC1297BM, LTC1297CM, LTC1297DM
LTC1297BC, LTC1297CC, LTC1297DC
–30 –10
LTC1297BI, LTC1297CI, LTC1297DI
AMBIENT TEMPERATURE (°C)
C
REF
10
30
below GND or one diode drop above V
V
this input diode to conduct, especially at elevated temperatures, and cause
errors for inputs near full scale. This spec allows 50mV forward bias of
either diode. This means that as long as the reference or analog input does
not exceed the supply voltage by more than 50mV, the output code will be
correct. To achieve an absolute 0V to 5V input voltage range will therefore
require a minimum supply voltage of 4.950V over initial tolerance,
temperature variations and loading.
Note 8: Channel leakage current is measured after the channel selection.
Note 9: Increased leakage currents at elevated temperatures cause the S/
H to droop, therefore it is recommended that f
CC
50
31kHz at 85 C, and f
levels (4.5V), as high level reference or analog inputs (5V) can cause
70
CLK = 1MHz
V
CC
90 110
LTC1292/7 G02
LTC1292
LTC1297
= 5V
130
CLK
(Note 3)
3kHz at 25 C.
10
6
0
9
8
7
5
4
3
2
1
– 50
MIN
LTC1297 Supply Current (Power
Shutdown) vs Temperature
LTC1292B/LTC1297B
LTC1292C/LTC1297C
LTC1292D/LTC1297D
V
V
CS HIGH
CLK OFF
CC
REF
CC
– 25
= 5V
= 5V
. Be careful during testing at low
AMBIENT TEMPERATURE (°C)
TYP
10
0
6
6
5
5
CLK
25
125kHz at 125 C, f
MAX
50
12
12
10
15
50
75
LTC1292/7 G03
100
UNITS
CLK
mA
mA
125
A
A
A