AD7707 datasheet(12/40 Pages) AD

12 / 40 page

REV. A

AD7707

–12–

READING NO.

32763

100

32764

32765

32766

32767

32768

32769

32770

32771

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 2. Typical Noise Plot @ Gain = 128 with 50 Hz

Update Rate for Low Level Input Channel

READING NO.

10Hz UPDATE RATE, UNBUFFERED MODE

GAIN = 2, ( 10V INPUT RANGE)

BIPOLAR MODE

ANALOG INPUT SET ON CODE TRANSITION

32769

32768

32767

32766

200

400

600

800

1000

Figure 3. Typical Noise Plot for AIN3, High Level Input

Channel

AIN3 – Volts

–10

AVDD = DVDD = 5V

REFIN(+) = 2.5V

REFIN(–) = AGND

TA = +25 C

HIGH LEVEL INPUT CHANNEL

10V INPUT RANGE

10Hz UPDATE RATE

–6

–2

BUFFERED MODE

UNBUFFERED MODE

Figure 4. Typical RMS Noise vs. Analog Input Voltage for

High Level Input Channel, AIN3

CODE

32764

400

32765

32766

32767

32768

32769

32770

300

200

100

Figure 5. Histogram of Data in Figure 2

CODE

10Hz UPDATE RATE

UNBUFFERED MODE

BIPOLAR MODE

GAIN = 2,

( 10V INPUT RANGE)

800

700

600

500

400

300

200

100

32767

32768

Figure 6. Histogram of Data in Figure 3

INPUT VOLTAGE – mV

–20

AVDD = DVDD = 5V

REFIN(+) = 2.5V

REFIN(–) = AGND

TA = +25 C

0.2

0.4

0.6

LOW LEVEL INPUT CHANNEL

GAIN = 128

10Hz UPDATE RATE

–15

–10

BUFFERED MODE

UNBUFFERED MODE

–5

0.5

0.3

0.1

Figure 7. Typical RMS Noise vs. Analog Input Voltage for

Low Level Input Channels, AIN1 and AIN2

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