WM8593 datasheet(10/98 Pages) WOLFSON

10 / 98 page

WM8593

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PP Rev 1.0 January 2007

Test Conditions

AVDD2=9V, AVDD1=DVDD=3.3V, AGND1=AGND2=0V, DGND=0V, TA=+25˚C, 1kHz signal, fs=48kHz, MCLK=256fs unless otherwise stated

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Headphone Amplifier

Output signal level (0dB)

0.8

Vrms

Signal to Noise Ratio

1,5

SNR

A-weighted

TBD

PO=20mW, RL=16Ω

TBD

Total Harmonic Distortion

THD

PO=20mW, RL=32Ω

TBD

Channel Separation

4,5

TBD

Power Supply Rejection Ratio

PSRR

TBD

Digital Volume Control

ADC minimum digital volume

-97

ADC maximum digital volume

+30

ADC volume step size

0.5

DAC minimum digital volume

-100

DAC maximum digital volume

+12

DAC volume step size

0.5

Analogue Volume Control

Minimum gain

-73.5

Maximum gain

Step size

0.5

Mute attenuation

TBD

Crosstalk

1kHz signal,

ADC fs=48kHz,

DAC fs=44.1kHz

100

DAC to ADC

20kHz signal,

ADC fs=48kHz,

DAC fs=44.1kHz

100

1kHz signal,

ADC fs=48kHz,

DAC fs=44.1kHz

100

ADC to DAC

20kHz signal,

ADC fs=48kHz,

DAC fs=44.1kHz

100

TERMINOLOGY

Signal-to-noise ratio (dBFS) – SNR is the difference in level between a reference full scale output signal and the

device output with no signal applied. This ratio is also called idle channel noise. (No Auto-zero or Automute function is

employed in achieving these results).

Dynamic range (dBFS) – DNR is a measure of the difference in level between the highest and lowest components of a

signal. Normally a THD measurement at -60dBFS. The measured signal is then corrected by adding 60dB to the

result, e.g. THD @ -60dBFS = -30dB, DNR = 90dB.

Total Harmonic Distortion (dBFS) – THD is the difference in level between a reference full scale output signal and the

first seven odd harmonics of the output signal. To calculate the ratio, the fundamental frequency of the output signal is

notched out and an RMS value of the next seven odd harmonics is calculated.

Channel Separation (dB) – Also known as Cross-Talk. This is a measure of the amount one channel is isolated from

the other. Normally measured by sending a full scale signal down one channel and measuring the other.

All performance measurements carried out with 20kHz low pass filter, and where noted an A-weighted filter. 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.

Notes:

WM8593 Datasheet(PDF) 10 Page - Wolfson Microelectronics plc

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