MAX1245 Datasheet, PDF (4/20 Pages) Maxim Integrated Products – +2.375V, Low-Power, 8-Channel, Serial 12-Bit ADC

+2.375V, Low-Power, 8-Channel,
Serial 12-Bit ADC
TIMING CHARACTERISTICS
(V_DD = +2.375V to +3.3V, COM = 0V, T_A = T_MIN to T_MAX, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
Acquisition Time
tACQ
DIN to SCLK Setup
tDS
DIN to SCLK Hold
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
tDH
tDO
tDV
tTR
tCSS
tCSH
Figure 1
Figure 1
Figure 2
SCLK Pulse Width High
tCH
SCLK Pulse Width Low
tCL
SCLK Fall to SSTRB
CS Fall to SSTRB Output Enable
CS Rise to SSTRB Output Disable
tSSTRB
tSDV
tSTR
Figure 1
External clock mode only, Figure 1
External clock mode only, Figure 2
SSTRB Rise to SCLK Rise
tSCK Internal clock mode only (Note 7)
MIN TYP MAX UNITS
2.0
µs
200
ns
0
ns
20
260
ns
240
ns
400
ns
200
ns
0
ns
300
ns
300
ns
260
ns
240
ns
400
ns
0
ns
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Tested at V_DD = +2.375V; COM = 0V; unipolar single-ended input mode.
Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range has
been calibrated.
External reference (VREF = +2.048V), offset nulled.
Ground “on” channel; sine wave applied to all “off” channels.
Conversion time defined as the number of clock cycles multiplied by the clock period; clock has 50% duty cycle.
The common-mode range for the analog inputs is from AGND to V_DD.
Guaranteed by design. Not subject to production testing.
ADC performance is limited by the converter’s noise floor, typically 300µVp-p.
| | ^{Measured as V}FS^{(2.375V) - V}FS^{(3.3V) .}
__________________________________________Typical Operating Characteristics
(VDD = 2.5V, VREF = 2.048V, fCLK = 1.5MHz, CLOAD = 20pF, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
1.25
RL = ∞
CODE = 101010100000
1.00
CLOAD = 50pF
SUPPLY CURRENT
vs. TEMPERATURE
0.90
RL = ∞
CODE = 101010100000
0.85
0.80
0.75
CLOAD = 20pF
0.50
2.375
2.625
2.875
VDD (V)
3.125
3.375
0.75
0.70
0.65
-55 -30 -5 20 45 70 95 120 145
TEMPERATURE (°C)
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
2.375
INTEGRAL NONLINEARITY
vs. SUPPLY VOLTAGE
2.625 2.875
VDD (V)
3.125
3.375
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