MAX1108 datasheet(7/20 Pages) MAXIM

7 / 20 page

Single-Supply, Low-Power,

2-Channel, Serial 8-Bit ADCs

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS—MAX1109 (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.)

CONDITIONS

External reference

Internal reference (Note 11)

µs

200

tCL

SCLK Pulse Width Low

tWAKE

Wake-Up Time

tCSH

CS to SCLK Rise Hold

100

tCSS

CS to SCLK Rise Setup

200

tCH

SCLK Pulse Width High

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

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: Power-down test performed using the following sequence 1) SHDN 5bit = 0 in the configuration register; 2) Wait for 10

SCLK cycles to complete current conversion; 3) Measure shutdown current with CS, SCLK, DIN = VDD or GND.

Note 10: Measured as

 VFS(2.7V) - VFS(3.6V) for MAX1108, and measured as  VFS(4.5V) - VFS(5.5V) for MAX1109.

Note 11: 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.)

200

SUPPLY CURRENT vs. SUPPLY VOLTAGE

180

160

SUPPLY VOLTAGE (V)

12345

140

120

100

DOUT = 10101010

MAX1108 (2.7V TO 5.5V)

MAX1109 (4.5V TO 5.5V)

INTERNAL REFERENCE

CLOAD = 47pF

CLOAD = 10pF

200

-40

100

SUPPLY CURRENT vs. TEMPERATURE

180

160

TEMPERATURE (°C)

-20

406080

140

120

100

VDD = 5V

VDD = 3V

DOUT = 10101010

CLOAD = 10pF

INTERNAL REFERENCE

0.50

2.5

5.5

SHUTDOWN SUPPLY CURRENT

vs. SUPPLY VOLTAGE

0.10

0.05

0.45

0.40

SUPPLY VOLTAGE (V)

3.0

3.5

4.0

4.5

5.0

0.35

0.30

0.25

0.20

0.15

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