Single-Supply, Low-Power,

2-Channel, Serial 8-Bit ADCs

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9

0.5

-0.5

0

300

INTEGRAL NONLINEARITY

vs. CODE

-0.1

0

-0.3

-0.4

-0.2

0.4

0.3

DIGITAL CODE

50

100

150

200

250

0.1

0.2

20

-100

030

FFT PLOT

-60

-80

0

FREQUENCY (kHz)

510

15

20

25

-20

-40

21.0

18.0

06

CONVERSION TIME vs. SUPPLY VOLTAGE

19.0

18.5

20.5

SUPPLY VOLTAGE (V)

12

3

4

5

20.0

19.5

INTERNAL CONVERSION MODE

Typical Operating Characteristics (continued)

Pin Description

Sampling Analog Inputs

CH0, CH1

2, 3

Reference voltage for analog-to-digital conversion (internal or external reference). Reference input for

external reference. Bypass internal reference with 1µF capacitor to GND.

REF

5

Ground

GND

4

Active-Low Chip Select. Data is not clocked into DIN unless CS is low. When CS is high, DOUT is high

impedance.

CS

7

Serial Data Output. Data is clocked out on the falling edge of SCLK. High impedance when CS is high.

DOUT

9

Serial Data Input. Data is clocked in at the rising edge of SCLK.

DIN

8

Common reference for analog inputs. Sets zero-code voltage in single-ended mode. Must be stable to

±0.5LSB during conversion.

COM

6

Serial Clock Input. Clocks data in and out of serial interface. In external clock mode, SCLK also sets the

conversion speed.

SCLK

10

PIN

Positive Supply Voltage

1

FUNCTION

NAME

25

15

-40

100

CONVERSION TIME vs. TEMPERATURE

18

17

16

24

23

TEMPERATURE (°C)

-20

0

20

40

60

80

22

21

20

19

INTERNAL CONVERSION MODE

1.0010

0.9980

-40

100

NORMALIZED REFERENCE VOLTAGE

vs. TEMPERATURE

0.9990

0.9985

1.0005

TEMPERATURE (°C)

-20

0

20

40

60

80

1.0000

0.9995

0

-100

025

CHANNEL-TO-CHANNEL

CROSSTALK vs. FREQUENCY

-70

-80

-90

-10

-20

FREQUENCY (kHz)

510

15

20

-30

-40

-50

-60