+2.7V, Low-Power, 2-Channel, 108ksps,

Serial 12-Bit ADCs in 8-Pin µMAX

6

_______________________________________________________________________________________

Typical Operating Characteristics (continued)

unless otherwise noted.)

Pin Description

External Reference Voltage Input. Sets the analog voltage range. Bypass with a 100nF capacitor close to

the device.

REF

5

Active-Low Chip-Select Input/Active-High Shutdown Input. Pulling CS/SHDN high puts the device into

shutdown with a maximum current of 5µA.

CS/SHDN

6

Serial Data Output. Data changes state at SCLK’s falling edge. High impedance when CS/SHDN

is high.

DOUT

7

Serial Clock Input. DOUT changes on the falling edge of SCLK.

SCLK

8

Analog and Digital Ground

GND

4

Analog Input: MAX144 = single-ended (CH1); MAX145 = differential (CH-)

CH1 (CH-)

3

PIN

Analog Input: MAX144 = single-ended (CH0); MAX145 = differential (CH+)

CH0 (CH+)

2

Positive Supply Voltage, +2.7V to +5.25V

1

FUNCTION

NAME

-0.20

-0.10

-0.15

0

-0.05

0.05

0.10

0.15

0.20

0

1024

2048

3072

4096

INTEGRAL NONLINEARITY

vs. OUTPUT CODE

OUTPUT CODE

0

0.1

0.2

0.3

0.4

0.5

2.5

3.5

3.0

4.0

4.5

5.0

5.5

INTEGRAL NONLINEARITY

vs. SUPPLY VOLTAGE

0

0.1

0.2

0.3

0.4

0.5

INTEGRAL NONLINEARITY

vs. TEMPERATURE

TEMPERATURE (°C)

-60

-10

15

-35

40

65

90

115 140

-140

-100

-120

-60

-80

-40

-20

0

20

027

54

FFT PLOT

FREQUENCY (kHz)

12.0

11.0

1

10

100

EFFECTIVE NUMBER OF BITS

vs. FREQUENCY

11.2

FREQUENCY (kHz)

11.4

11.6

11.8