Datasheet
ADAU1381
Rev. B | Page 9 of 84
TYPICAL POWER MANAGEMENT MEASUREMENTS
Master clock = 12.288 MHz, PLL is active in integer mode at a 256 × f
S
input rate for f
S
= 48 kHz, analog and digital input tones are
−1 dBFS with a frequency of 1 kHz. Analog input and output are simultaneously active. Pseudo differential stereo input is routed to
ADCs, and DACs are routed to stereo line output with a 16 k load. ADC input at −1 dBFS, DAC input at 0 dBFS. The speaker output is
disabled. The serial port is configured in slave mode. The beep path is disabled. The sound engine processing path is enabled. Current
measurements are given in units of mA rms.
Table 4. Mixer Boost and Power Management Conditions
Operating Voltage Power Management Mode
1
Mixer Boost Mode
2
Typical AVDD Current
Consumption (mA)
Typical ADC
THD + N (dB)
Typical Line Output
THD + N (dB)
AVDD = IOVDD = 3.3 V Normal (default) Normal operation 16.84 88.5 93.0
Boost Level 1 16.88 88.5 93.0
Boost Level 2 16.92 88.5 93.0
Boost Level 3 17.00 88.5 93.0
Extreme power saving Normal operation 15.66 88.0 87.5
Boost Level 1 15.68 88.0 87.5
Boost Level 2 15.70 88.0 87.5
Boost Level 3 15.75 88.0 87.5
Enhanced performance Normal operation 17.43 88.5 94.5
Boost Level 1 17.50 88.5 94.5
Boost Level 2 17.53 88.5 94.5
Boost Level 3 17.63 88.5 94.5
Power saving Normal operation 16.25 89.0 90.5
Boost Level 1 16.28 89.0 90.5
Boost Level 2 16.31 89.0 90.5
Boost Level 3 16.38 89.0 90.5
AVDD = IOVDD = 1.8 V Normal (default) Normal operation 15.15 88.5 89.5
Boost Level 1 15.19 88.5 89.5
Boost Level 2 15.23 88.5 89.5
Boost Level 3 15.30 88.5 89.5
Extreme power saving Normal operation 14.03 86.5 85.5
Boost Level 1 14.05 86.5 85.5
Boost Level 2 14.07 86.5 85.5
Boost Level 3 14.12 86.5 85.5
Enhanced performance Normal operation 15.71 88.5 90.5
Boost Level 1 15.76 88.5 90.5
Boost Level 2 15.81 88.5 90.5
Boost Level 3 15.89 88.5 90.5
Power saving Normal operation 14.59 88.0 88.0
Boost Level 1 14.62 88.0 88.0
Boost Level 2 14.65 88.0 88.0
Boost Level 3 14.71 88.0 88.0
1
Set by Register 0x4009, Bits[4:1], and Register 0x4029, Bits[5:2].
2
Set by Register 0x4009, Bits[6:5].
DIGITAL FILTERS
Table 5.
Parameter Mode Factor Min Typ Max Unit
ADC DECIMATION FILTER
All modes, typ value is for 48 kHz
Pass Band 0.4375 × f
S
21 kHz
Pass-Band Ripple ±0.015 dB
Transition Band 0.5 × f
S
24 kHz
Stop Band 0.5625 × f
S
27 kHz
Stop-Band Attenuation 70 dB
Group Delay 22.9844/f
S
479 µs