Datasheet

ADAU1381
Rev. B | Page 5 of 84
Parameter Test Conditions/Comments Min Typ Max Unit
Left/Right Microphone PGA Gain
Range
AVDD = 3.3 V 0 32 dB
Left/Right Microphone PGA Mute
Attenuation
AVDD = 3.3 V; mute set by Register
0x400E, Bit 1, and Register 0x400F, Bit 1
−98 dB
Interchannel Gain Mismatch AVDD = 3.3 V 50 mdB
Offset Error AVDD = 3.3 V 0.25 mV
Gain Error AVDD = 3.3 V −1 %
Interchannel Isolation AVDD = 3.3 V −98 dB
Power Supply Rejection Ratio CM capacitor = 10 F
AVDD = 3.3 V, 100 mV p-p at 217 Hz −55 dB
AVDD = 3.3 V, 100 mV p-p at 1 kHz −55 dB
DIFFERENTIAL MICROPHONE INPUT TO
ADC PATH
Full-Scale Input Voltage (0 dB) Scales linearly with AVDD AVDD/3.3 V rms
AVDD = 1.8 V 0.55 (1.56) V rms (V p-p)
AVDD = 3.3 V 1.0 (2.83) V rms (V p-p)
Dynamic Range −60 dB input
With A-Weighted Filter (RMS) AVDD = 1.8 V 96 dB
AVDD = 3.3 V 94 99.2 dB
No Filter (RMS) AVDD = 1.8 V 92 dB
AVDD = 3.3 V 92 96.5 dB
Total Harmonic Distortion + Noise −3 dBFS
AVDD = 1.8 V −84 dB
AVDD = 3.3 V −85 dB
Signal-to-Noise Ratio
With A-Weighted Filter (RMS) AVDD = 1.8 V 96 dB
AVDD = 3.3 V 100 dB
No Filter (RMS) AVDD = 1.8 V 92 dB
AVDD = 3.3 V 97 dB
Left/Right Microphone PGA Mute
Attenuation
AVDD = 3.3 V; mute set by Register
0x400E, Bit 1, and Register 0x400F, Bit 1
−98 dB
Interchannel Gain Mismatch AVDD = 3.3 V 50 mdB
Offset Error AVDD = 3.3 V 0.25 mV
Gain Error AVDD = 3.3 V −1 %
Interchannel Isolation AVDD = 3.3 V −85 dB
Common-Mode Rejection Ratio AVDD = 3.3 V, 100 mV rms, 1 kHz −60 dB
AVDD = 3.3 V, 100 mV rms, 20 kHz −45 dB
BEEP TO LINE OUTPUT PATH
Full-Scale Input Voltage (0 dB) Scales linearly with AVDD AVDD/3.3 V rms
AVDD = 1.8 V 0.55 (1.56) V rms (V p-p)
AVDD = 3.3 V 1.0 (2.83) V rms (V p-p)
Total Harmonic Distortion + Noise
−3 dBFS input, measured at AOUTL pin,
beep gain set to 0 dB
AVDD = 1.8 V −88 dB
AVDD = 3.3 V −88 dB
Signal-to-Noise Ratio
With A-Weighted Filter (RMS) AVDD = 1.8 V 99 dB
AVDD = 3.3 V 105 dB
No Filter (RMS) AVDD = 1.8 V 96 dB
AVDD = 3.3 V 102 dB