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MAX1272 Datasheet, PDF (5/20 Pages) Maxim Integrated Products – Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range
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Fault-Protected, 12-Bit ADCs
with Software-Selectable Input Range
TIMING CHARACTERISTICS
(VDD = 4.75V to 5.25V, unipolar/bipolar input range, external reference mode, VREF = 4.096V, CREF = 1.0µF, fSCLK = 1.4MHz,
50% duty cycle, CLOAD = 50pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Figures 1 and 4)
PARAMETERS
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
DIN to SCLK Setup
tDS
100
ns
DIN to SCLK Hold
tDH
0
ns
SCLK Fall to Output Data Valid
CS Fall to Output Enable
CS Rise to Output Disable
CS to SCLK Rise Setup
CS to SCLK Rise Hold
tDO
tDV
tTR
tCSS
tCSH
20
250
ns
100
ns
100
ns
100
ns
0
ns
SCLK Pulse Width High
tCH
200
ns
SCLK Pulse Width Low
tCL
200
ns
Note 1: Accuracy specifications tested at VDD = 5V. Performance at power-supply tolerance limit is guaranteed by power-supply
rejection test.
Note 2: Offset error nulled. The ideal last-code transition is (FS - 1.5 LSB).
Note 3: PSRR measured at full scale. Tested at ±10V (MAX1272) and ±4.096V (MAX1273) input ranges.
Note 4: Acquisition and conversion times are dependent on the clock speed.
Typical Operating Characteristics
(Typical operating circuit, BIP = RNG = 1, VDD = 5V, external reference mode, VREF = 4.096V, CREF = 1.0µF, fSCLK = 1.4MHz,
50% duty cycle, 87ksps, TA = +25°C, unless otherwise noted.)
CONVERTING SUPPLY CURRENT
vs. SUPPLY VOLTAGE
5.0
VAIN = 0
4.5
4.0
3.5
3.0 INTERNAL
2.5 REFERENCE
2.0
1.5
1.0
EXTERNAL
REFERENCE
0.5
0
4.75 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25
SUPPLY VOLTAGE (V)
CONVERTING SUPPLY CURRENT
vs. TEMPERATURE
5.0
VAIN = 0
4.5
4.0
3.5
3.0 INTERNAL
2.5 REFERENCE
2.0
1.5
1.0
EXTERNAL
REFERENCE
0.5
0
-40 -15
10
35
60
85
TEMPERATURE (°C)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-40
STANDBY SUPPLY CURRENT
vs. TEMPERATURE
VAIN = 0
INTERNAL
REFERENCE
EXTERNAL
REFERENCE
-15 10
35
60
85
TEMPERATURE (°C)
_______________________________________________________________________________________ 5
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