Production Data

WM8521

w

PD, Rev 4.2, February 2013

7

Test Conditions

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SNR (Terminology Note 1,2,3)

A-weighted

@ fs = 96kHz

96

dB

SNR (Terminology Note 1,2,3)

Non ‘A’ weighted @ fs =

48kHz

93

dB

THD (Note 3)

1kHz, 0dBFs

-81

dB

Dynamic Range (Note 2)

1kHz, THD+N @

-60dBFs

91

96

dB

DAC Channel Separation

1kHz, 0dBFs

93

dB

Power Supply Rejection Ratio

PSRR

1kHz 100mVpp

46

dB

Analogue Output Levels

Gain Mismatch

Channel-to-channel

±1

%FSR

Minimum Resistance Load

To midrail or a.c.

coupled

5

k



Maximum Capacitance Load

5.6

nF

Output d.c. Level

AVDD/2

V

Power On Reset (POR)

POR Threshold

DVDD

1.56

V

Notes:

1.

Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured ‘A’

weighted over a 20Hz to 20kHz bandwidth.

2.

All performance measurements done with 20kHz low pass filter, and where noted an A-weight filter. Failure to use

such a filter will result in higher THD+N 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.

3.

CAP pin decoupled with 10uF and 0.1uF capacitors (smaller values may result in reduced performance).

4.

Power down refers to operation after MCLK has been stopped. Digital reset occurs 1.5

s after MCLK is stopped.

TERMINOLOGY

1.

Signal-to-noise ratio (dB) - SNR is a measure of the difference in level between the full scale output and the output with

no signal applied. (No Auto-zero or Automute function is employed in achieving these results).

2.

Dynamic range (dB) - DNR is a measure of the difference between the highest and lowest portions of a signal.

Normally a THD+N measurement at 60dB below full scale. The measured signal is then corrected by adding the 60dB

to it. (e.g. THD+N @ -60dB= -32dB, DR= 92dB).

3.

THD+N (dB) - THD+N is a ratio, of the rms values, of (Noise + Distortion)/Signal.

4.

Stop band attenuation (dB) - Is the degree to which the frequency spectrum is attenuated (outside audio band).

5.

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.