AD7779 datasheet(22/97 Pages) AD

22 / 97 page

AD7779

Data Sheet

Rev. 0 | Page 22 of 97

100

105

110

115

120

125

1248

ODR (kHz)

GAIN = 1

GAIN = 2

GAIN = 4

GAIN = 8

VREF =2.5V

VIN =0dBFS

TEMPERATURE = 25°C

Figure 38. SNR vs. ODR at 8 kSPS, High Resolution Mode

(AVDDx = 3.6 V, AVSS = 1.8 V, IOVDD = 3.6 V)

100

110

120

PGA GAIN

8000

GAIN = 1

GAIN = 2

GAIN = 4

GAIN = 8

Figure 39. Dynamic Range vs. PGA Gain, High Resolution Mode, ODR = 8 kSPS

–60

–50

–40

–30

–20

–10

PGA GAIN

CH 0

CH 1

CH 2

CH 3

CH 4

CH 5

CH 6

CH 7

AVDD1x = 3.3V

VREF =2.5V

TEMPERATURE = 25°C

VIN =0V

Figure 40. Offset Error vs. PGA Gain, High Resolution Mode, AVDD1x = 3.3 V

100

105

110

115

120

125

0.5

1248

ODR (kHz)

GAIN = 1

GAIN = 2

GAIN = 4

GAIN = 8

VREF =2.5V

TEMPERATURE = 25°C

INPUT VOLTAGE = 5V p-p

INPUT FREQUENCY = 50Hz

VIN = 0dBFS

Figure 41. SNR vs. ODR at 2 kSPS, Low Power Mode

(AVDDx = 3.6 V, AVSS = 1.8 V, IOVDD = 3.6 V)

100

110

120

PGA GAIN

2000

GAIN = 1

GAIN = 2

GAIN = 4

GAIN = 8

Figure 42. Dynamic Range vs. PGA Gain, Low Power Mode, ODR = 2 kSPS

–70

–60

–50

–40

–30

–20

–10

PGA GAIN

CH 0

CH 1

CH 2

CH 3

CH 4

CH 5

CH 6

CH 7

VREF =2.5V

TEMPERATURE = 25°C

VIN =0V

AVDD1x = 3.3V

Figure 43. Offset Error vs. PGA Gain, Low Power Mode, AVDD1x = 3.3 V

AD7779 Datasheet(PDF) 22 Page - Analog Devices

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