Datasheet

Data Sheet ADAU1772
Rev. B | Page 5 of 116
Parameter Test Conditions/Comments Min Typ Max Unit
Total Harmonic Distortion + Noise 20 Hz to 20 kHz, −1 dBFS
AVDD = 1.8 V −88 dB
AVDD = 3.3 V
−90
dB
Signal-to-Noise Ratio
2
With A-Weighted Filter (RMS) AVDD = 1.8 V 96 dB
AVDD = 3.3 V 102 dB
With Flat 20 Hz to 20 kHz Filter AVDD = 1.8 V 94 dB
AVDD = 3.3 V 99 dB
PGA Gain Variation
With −12 dB Setting Standard deviation 0.05 dB
With +35.25 dB Setting Standard deviation 0.15 dB
PGA Boost PGA_x_BOOST 10 dB
PGA Mute Attenuation PGA_MUTEx −65 dB
Interchannel Gain Mismatch 0.005 dB
Offset Error 0 mV
Gain Error ±0.2 dB
Interchannel Isolation 83 dB
Power Supply Rejection Ratio CM capacitor = 22 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
1.16
V
AVDD = 3.3 V, MIC_GAINx = 1 2.12 V
0.90 × AVDD AVDD = 1.8 V, MIC_GAINx = 0 1.63 V
AVDD = 3.3 V, MIC_GAINx = 0 2.97 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
3
AVDD = 1.8 V, 20 Hz to 20 kHz
MIC_GAINx = 0 27 nV/√Hz
MIC_GAINx = 1 16 nV/√Hz
AVDD = 3.3 V, 20 Hz to 20 kHz
MIC_GAINx = 0 35 nV/√Hz
MIC_GAINx = 1 19 nV/√Hz
DIGITAL-TO-ANALOG CONVERTERS
DAC Resolution All DACs 24 Bits
Digital Attenuation Step 0.375 dB
Digital Attenuation Range 95 dB
DAC SINGLE-ENDED OUTPUT Single-ended operation, HPOUTLP and
HPOUTRP 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, 0 dBFS 1.5 V p-p
AVDD = 3.3 V
0.97
V rms
AVDD = 3.3 V, 0 dBFS 2.74 V p-p
Mute Attenuation −72 dB
Dynamic Range
1
Line output mode, 20 Hz to 20 kHz, −60 dB input
With A-Weighted Filter (RMS) AVDD = 1.8 V 100 dB
AVDD = 3.3 V 104 dB
With Flat 20 Hz to 20 kHz Filter AVDD = 1.8 V 97 dB
AVDD = 3.3 V 101 dB
Signal-to-Noise Ratio
2
Line output mode, 20 Hz to 20 kHz
With A-Weighted Filter (RMS) AVDD = 1.8 V 100 dB
AVDD = 3.3 V 104 dB
With Flat 20 Hz to 20 kHz Filter AVDD = 1.8 V 98 dB
AVDD = 3.3 V
102
dB