LTC1292 Просмотр технического описания (PDF) - Linear Technology
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LTC1292 Datasheet PDF : 24 Pages
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LTC1292/LTC1297
U
DIGITAL A D DC ELECTRICAL CHARACTERISTICS (Note 3)
SYMBOL PARAMETER
CONDITIONS
LTC1292B/LTC1297B
LTC1292C/LTC1297C
LTC1292D/LTC1297D
MIN TYP MAX
UNITS
ICC
Positive Supply Current
CS High
CS Low
LTC1292 q
LTC1297 q
6
12
mA
6
12
mA
CS High
Power
Shutdown
CLK Off
LTC1297BC, LTC1297CC, LTC1297DC q
LTC1297BI, LTC1297CI, LTC1297DI q
LTC1297BM, LTC1297CM, LTC1297DM
5
10
µA
5
15
µA
IREF
Reference Current
CS High
q
10
50
µA
The q denotes specifications which apply over the operating temperature
range; all other limits and typicals TA = 25°C.
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: VCC = 5V, VREF = 5V, CLK = 1.0MHz unless otherwise specified.
Note 4: One LSB is equal to VREF divided by 4096. For example, when VREF
= 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
below GND or one diode drop above VCC. Be careful during testing at low
VCC levels (4.5V), as high level reference or analog inputs (5V) can cause
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 fCLK ≥125kHz at 125°C, fCLK
≥ 31kHz at 85°C, and fCLK ≥ 3kHz at 25°C.
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
10
CLK = 1MHz
TA = 25°C
8
6
4
2
0
4
5
6
SUPPLY VOLTAGE (V)
LTC1292/7 G01
Supply Current vs Temperature
10
CLK = 1MHz
9
VCC = 5V
8
7
6
5
4
3
–50 –30 –10 10 30 50 70 90 110 130
AMBIENT TEMPERATURE (°C)
LTC1292/7 G02
LTC1297 Supply Current (Power
Shutdown) vs Temperature
10
9
VCC = 5V
VREF = 5V
8 CS HIGH
CLK OFF
7
6
5
4
3
2
1
0
– 50 – 25 0 25 50 75 100 125
AMBIENT TEMPERATURE (°C)
LTC1292/7 G03
4
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