AD7770 datasheet(21/94 Pages) AD

21 / 94 page

Data Sheet

AD7770

Rev. A | Page 21 of 94

–140

–135

–130

–125

–120

–115

–110

–105

–100

INPUT VOLTAGE (V)

INPUT FREQUENCY = 50Hz

VREF = 2.5V

TEMPERATURE = 25°C

GAIN = 1

GAIN = 2

GAIN = 4

GAIN = 8

Figure 32. THD vs. Input Voltage at 16 kSPS, High Resolution Mode

–125

–120

–115

–110

–105

–100

–95

–90

REFERENCE VOLTAGE (V)

INPUT FREQUENCY = 50Hz

INPUT VOLTAGE = –0.5dBFS

TEMPERATURE = 25°C

GAIN = 1

GAIN = 2

GAIN = 4

GAIN = 8

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2

Figure 33. THD vs. Reference Voltage at 16 kSPS, High Resolution Mode

–125

–120

–115

–110

–105

–100

MCLK FREQUENCY (Hz)

GAIN = 1

GAIN = 2

GAIN = 4

GAIN = 8

INPUT FREQUENCY = 50Hz

VREF = 2.5V

INPUT VOLTAGE = –0.5dBFS

TEMPERATURE = 25°C

DECIMATION = 256

Figure 34. THD vs. MCLK Frequency, High Resolution Mode

–140

–135

–130

–125

–120

–115

–110

–105

–100

INPUT VOLTAGE (V)

INPUT FREQUENCY = 50Hz

VREF = 2.5V

TEMPERATURE = 25°C

GAIN = 1

GAIN = 2

GAIN = 4

GAIN = 8

Figure 35. THD vs. Input Voltage at 4 kSPS, Low Power Mode

–125

–120

–115

–110

–105

–100

–95

–90

REFERENCE VOLTAGE (V)

INPUT FREQUENCY = 50Hz

INPUT VOLTAGE = –0.5dBFS

TEMPERATURE = 25°C

GAIN = 1

GAIN = 2

GAIN = 4

GAIN = 8

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2

Figure 36. THD vs. Reference Voltage at 4 kSPS, Low Power Mode

–130

–125

–120

–115

–110

–105

–100

MCLK FREQUENCY (Hz)

GAIN = 1

GAIN = 2

GAIN = 4

GAIN = 8

INPUT FREQUENCY = 50Hz

VREF = 2.5V

INPUT VOLTAGE = –0.5dBFS

TEMPERATURE = 25°C

DECIMATION = 256

Figure 37. THD vs. MCLK Frequency, Low Power Mode

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