AD7707_17 datasheet(13/53 Pages) AD

Part #	AD7707

Description	3-Channel 16-Bit, Sigma-Delta ADC

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AD7707

Rev. B | Page 12 of 52

TYPICAL PERFORMANCE CHARACTERISTICS

CODE

32,764

400

0

32,765

32,766

32,767

32,768

32,769

32,770

300

200

100

READING NUMBER

32,763

0100

32,764

32,765

32,766

32,767

32,768

32,769

32,770

32,771

200

300

400

500

600

700

800

900 1000

VDD = 5V

VREF = 2.5V

GAIN = 128

50Hz UPDATE RATE

TA = 25°C

RMS NOISE = 600nV

Figure 4. Typical Noise Plot at Gain = 128 with 50 Hz Update Rate for Low

Level Input Channel

Figure 7. Histogram of Data in Figure 4

READING NUMBER

0

32,769

32,768

32,767

32,766

10Hz UPDATE RATE, UNBUFFERED MODE

GAIN = 2 (±10V INPUT RANGE)

BIPOLAR MODE

ANALOG INPUT SET ON CODE TRANSITION

200

400

600

800

1000

CODE

0

800

700

600

500

400

300

200

100

10Hz UPDATE RATE

UNBUFFERED MODE

BIPOLAR MODE

GAIN = 2

(±10V INPUT RANGE)

1

32,767

2

32,768

Figure 8. Histogram of Data in Figure 5

Figure 5. Typical Noise Plot for AIN3, High Level Input Channel

AIN3 (V)

–10

7

8

9

10

–6

–2

2

6

10

BUFFERED MODE

UNBUFFERED MODE

6

5

4

3

2

1

0

HIGH LEVEL INPUT CHANNEL

±10V INPUT RANGE

10Hz UPDATE RATE

AVDD= DVDD= 5V

REF IN(+) = 2.5V

REF IN(–) = AGND

TA = 25°C

INPUT VOLTAGE (mV)

–20

0

0.2

0.4

0.6

0

2

5

1

0

1

0

1

–

5

1

–

BUFFERED MODE

UNBUFFERED MODE

–5

0

5

0.5

0.3

0.1

LOW LEVEL INPUT CHANNEL

GAIN = 128

10Hz UPDATE RATE

AVDD= DVDD= 5V

REF IN(+) = 2.5V

REF IN(–) = AGND

TA = +25°C

Figure 6. Typical RMS Noise vs. Analog Input Voltage for High Level Input

Channel, AIN3

Figure 9. Typical RMS Noise vs. Analog Input Voltage for Low Level Input

Channels, AIN1 and AIN2

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