Datasheet

ADAU1381
Rev. B | Page 6 of 84
Parameter Test Conditions/Comments Min Typ Max Unit
Dynamic Range −60 dB input
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
Beep Input Mute Attenuation
AVDD = 3.3 V; mute set by
Register 0x4008, Bit 3
−90 dB
Offset Error AVDD = 3.3 V 10 mV
Gain Error AVDD = 3.3 V −0.3 dB
Interchannel Gain Mismatch 30 mdB
Beep Input PGA Gain Range AVDD = 3.3 V −23 +32 dB
Beep Playback Mixer Gain Range AVDD = 3.3 V −15 +6 dB
Power Supply Rejection Ratio CM capacitor = 10 F
AVDD = 3.3 V, 100 mV p-p at 217 Hz −58 dB
AVDD = 3.3 V, 100 mV p-p at 1 kHz −72 dB
MICROPHONE BIAS Microphone bias enabled
Bias Voltage
0.65 × AVDD AVDD = 1.8 V, low bias 1.17 V
AVDD = 3.3 V, low bias 2.145 V
0.90 × AVDD AVDD = 1.8 V, high bias 1.62 V
AVDD = 3.3 V, high bias 2.97 V
Bias Current Source
AVDD = 3.3 V, high bias, high
performance
5 mA
Noise in the Signal Bandwidth AVDD = 3.3 V, 20 Hz to 20 kHz
High bias, high performance 39 nV√Hz
High bias, low performance 78 nV√Hz
Low bias, high performance 25 nV√Hz
Low bias, low performance 35 nV√Hz
AVDD = 1.8 V, 20 Hz to 20 kHz
High bias, high performance 35 nV√Hz
High bias, low performance 45 nV√Hz
Low bias, high performance 23 nV√Hz
Low bias, low performance 23 nV√Hz
OUTPUT SIDE PERFORMANCE SPECIFICATIONS
Specifications guaranteed at 25°C (ambient). The output load for the speaker output path is an 8 Ω, 400 mW speaker.
Table 2.
Parameter Test Conditions/Comments Min Typ Max Unit
DIGITAL-TO-ANALOG CONVERTERS
DAC Resolution All DACs 24 Bits
Digital Attenuation Step 0.375 dB
Digital Attenuation Range 95 dB
DAC TO LINE OUTPUT PATH
Full-Scale Output 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)
Line Output Mute Attenuation,
DAC to Mixer Path Muted
AVDD = 3.3 V; mute set by Register
0x401C, Bit 5, and Register 0x401E, Bit 6
−85 dB
Line Output Mute Attenuation,
Line Output Muted
AVDD = 3.3 V; mute set by Register
0x4025, Bit 1, and Register 0x4026, Bit 1
−85 dB