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| MAX1108 Datasheet, PDF (7/20 Pages) Maxim Integrated Products – Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs | |||
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Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
ELECTRICAL CHARACTERISTICSâMAX1109 (continued)
(VDD = +4.5V to +5.5V; unipolar input mode; COM = GND, fSCLK = 500kHz, external clock (50% duty cycle); 10 clocks/conversion
cycle (50ksps); 1µF capacitor at REF, external +4.096V reference at REF; TA = TMIN to TMAX; unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
CS to SCLK Rise Setup
CS to SCLK Rise Hold
SCLK Pulse Width High
SCLK Pulse Width Low
Wake-Up Time
SYMBOL
CONDITIONS
tCSS
tCSH
tCH
tCL
External reference
tWAKE Internal reference (Note 10)
MIN TYP MAX UNITS
100
ns
0
ns
200
ns
200
ns
20
µs
12
ms
Note 1: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range has
been calibrated.
Note 2: See Typical Operating Characteristics.
Note 3: VREF = +2.048V (MAX1108), VREF = +4.096V (MAX1109), offset nulled.
Note 4: Common-mode range (CH0, CH1, COM) GND to VDD.
Note 5: Conversion time defined as the number of clock cycles times the clock period; clock has 50% duty cycle (Figures 6 and 8).
Note 6: REF supplies typically 2.5mA under normal operating conditions.
Note 7: External load should not change during the conversion for specified accuracy.
Note 8: Power consumption with CMOS levels.
Note 9: Measured as  VFS(2.7V) - VFS(3.6V) for MAX1108, and measured as  VFS(4.5V) - VFS(5.5V) for MAX1109.
Note 10: 1µF at REF, internal reference settling to 0.5LSB.
Typical Operating Characteristics
(VDD = +3.0V (MAX1108), VDD = +5.0V (MAX1109); external conversion mode; fSCLK = 500kHz; 50ksps; external reference; 1µF at
REF; TA = +25°C; unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
200
180
CLOAD = 47pF
160
140
120
CLOAD = 10pF
100
80
60
DOUT = 10101010
40 MAX1108 (2.7V TO 5.5V)
20
MAX1109 (4.5V TO 5.5V)
INTERNAL REFERENCE
0
0
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. TEMPERATURE
200
180
VDD = 5V
160
140
120
100
VDD = 3V
80
60
40 DOUT = 10101010
20
CLOAD = 10pF
INTERNAL REFERENCE
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________ 7
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