WM9082 Datasheet, PDF (6/24 Pages) Wolfson Microelectronics plc – PDM Input Mono 3W Class D Speaker Driver

WM9082
PARAMETER
Power Consumption
Quiescent current
(WM9082 in the ‘ON’
state; CLK enabled;
DATA input is idle
channel data.)
Standby current
(WM9082 in the
‘STANDBY’ state; CLK
enabled; DATA input is
repeated Control Code.)
Shutdown current
(WM9082 in the OFF
state; CLK and DATA
inputs disabled.)
SYMBOL
TEST CONDITIONS
I_DVDD
I_SPKVDD
R_L = 4
R_L = 8
I_DVDD
I_SPKVDD
I_DVDD
I_SPKVDD
Note 1: Guaranteed by design; not production-tested.
Production Data
MIN
TYP
MAX
UNIT
0.6
mA
8
mA
8
250
µA
200
µA
0.6
µA
0.05
µA
TERMINOLOGY
1. Signal-to-Noise Ratio (dB) – SNR is the difference in level between a full scale output signal and the device output
noise with no signal applied, measured over a bandwidth of 20Hz to 20kHz. (No Auto-zero or Mute function is
employed).
2. Total Harmonic Distortion (dB) – THD is the difference in level between a 1kHz reference sine wave output signal and
the sum of the harmonics of the output signal. The amplitude of the fundamental frequency of the output signal is
compared to the RMS value of the sum of the harmonics and expressed as a ratio.
3. Total Harmonic Distortion plus Noise (dB) – THD+N is the difference in level between a 1kHz reference sine wave
output signal and all noise and distortion products in the audio band. The amplitude of the fundamental reference
frequency of the output signal is compared to the RMS value of all other noise and distortion products and expressed
as a ratio.
4. Power Supply Rejection Ratio (dB) – PSRR is a measure of ripple attenuation between a power supply rail and a
signal output path. With the signal path idle, a small sine wave ripple is applied to power supply rail. The amplitude of
the supply ripple is compared to the amplitude of the output signal generated and is expressed as a ratio.
5. All performance measurements are carried out with 20kHz AES17 low pass filter for distortion measurements, and an
A-weighted filter for noise measurement. Failure to use such a filter will result in higher THD and lower SNR and
Dynamic Range readings than are found in the Electrical Characteristics. The low pass filter removes out-of-band
noise; although it is not audible, it may affect dynamic specification values.
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PD, August 2012, Rev 4.1
6