ADAU1777_17 datasheet(6/109 Pages) AD

Part #	ADAU1777

Description	Four-ADC, Two-DAC, Low Power Codec

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Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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Data Sheet

ADAU1777

Rev. 0 | Page 5 of 108

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

THD + N

20 Hz to 20 kHz, −1 dB from full-scale input

AVDD = 1.8 V

−88

dB

AVDD = 3.3 V

−90

dB

SNR2

With A-Weighted Filter (RMS)

AVDD = 1.8 V

94

dB

AVDD = 3.3 V

102

dB

With Flat 20 Hz to 20 kHz Filter

AVDD = 1.8 V

93

dB

AVDD = 3.3 V

98

dB

PGA Gain Variation

Standard deviation

With −12 dB Setting

0.05

dB

With +35.25 dB Setting

0.15

dB

PGA Boost

PGA_x_BOOST

10

dB

PGA Mute Attenuation

PGA_MUTEx

−63

dB

Interchannel Gain Mismatch

0.04

dB

Offset Error

−0.12

+0.12

mV

Gain Error

−0.05

dB

Interchannel Isolation

100

dB

PSRR

CM capacitor = 20 μF, 100 mV p-p at 1 kHz

63

dB

MICROPHONE BIAS

MIC_ENx = 1

Bias Voltage

0.65 × AVDD

AVDD = 1.8 V, MIC_GAINx = 1

1.14

1.16

1.17

V

AVDD = 3.3 V, MIC_GAINx = 1

2.10

2.12

2.14

V

0.90 × AVDD

AVDD = 1.8 V, MIC_GAINx = 0

1.61

1.63

1.65

V

AVDD = 3.3 V, MIC_GAINx = 0

2.95

2.97

2.99

V

Bias Current Source

3

mA

Output Impedance

1

Ω

MICBIASx Isolation

MIC_GAINx = 0

95

dB

MIC_GAINx = 1

99

dB

Noise in the Signal Bandwidth

20 Hz to 20 kHz, 4.7 µF decoupling capacitor,

5.0 kΩ load on the MICBIASx pins

AVDD = 1.8 V

MIC_GAINx = 0

27

nV/√Hz

MIC_GAINx = 1

16

nV/√Hz

AVDD = 3.3 V

MIC_GAINx = 0

35

nV/√Hz

MIC_GAINx = 1

19

nV/√Hz

DIGITAL-TO-ANALOG CONVERTERS (DACs)

Resolution

All DACs

24

Bits

Digital Attenuation Step

0.375

dB

Digital Attenuation Range

95

dB

DAC SINGLE-ENDED OUTPUT

Single-ended operation, HPOUTLP/LOUTLP and

HPOUTRP/LOUTRP pins

Full-Scale Output Voltage

Scales linearly with AVDD

AVDD/3.4

V rms

AVDD = 1.8 V

0.53

V rms

AVDD = 1.8 V

1.5

V p-p

AVDD = 3.3 V

0.97

V rms

AVDD = 3.3 V

2.74

V p-p

Mute Attenuation

−72

dB

Line Output Mode

Dynamic Range1

20 Hz to 20 kHz, −60 dB input

With A-Weighted Filter (RMS)

AVDD = 1.8 V

97

100

dB

AVDD = 3.3 V

102

104

dB

With Flat 20 Hz to 20 kHz Filter

AVDD = 1.8 V

95

97

dB

AVDD = 3.3 V

99

101

dB

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