WM9082

Production Data

w

PD, August 2012, Rev 4.1

6

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Power Consumption

Quiescent current

(WM9082 in the ‘ON’

state; CLK enabled;

DATA input is idle

channel data.)

0.6

mA

8

mA

8

Standby current

(WM9082 in the

‘STANDBY’ state; CLK

enabled; DATA input is

repeated Control Code.)

250

µA

200

µA

Shutdown current

(WM9082 in the OFF

state; CLK and DATA

inputs disabled.)

0.6

µA

0.05

µA

Note 1: Guaranteed by design; not production-tested.

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.