WM8711L(2006) データシートの表示（PDF） - Wolfson Microelectronics plc

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WM8711L
(Rev.:2006)

Internet Audio DAC with Integrated Headphone Amplifier

Wolfson Microelectronics plc 

Production Data

WM8711 / WM8711L

Test Conditions

AVDD, HPVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 1.5V, DGND = 0V, TA = +25oC, Slave Mode, fs = 48kHz, MCLK = 256fs

unless otherwise stated.

PARAMETER

Stereo Headphone Output

0dB Full scale output voltage

Max Output Power

Signal to Noise Ratio (Note 1,2)

Total Harmonic Distortion

Power Supply Rejection Ratio

Programmable Gain

Programmable Gain Step Size

Mute attenuation

SYMBOL TEST CONDITIONS

PO

SNR

THD

PSRR

RL = 32Ω

RL = 16Ω

A-weighted

1kHz, RL = 32Ω,

PO = 10mW rms

1kHz, RL = 32Ω,

PO = 20mW rms

1kHz 100mVpp

20Hz to 20kHz

100mVpp

1kHz

1kHz

1kHz, 0dB

MIN

TYP

1.0 x

AVDD/3.3

30

55

90

98

0.056

-65

0.56

-45

50

45

-73

6

1

80

MAX

0.1

-60

1.0

-40

6

UNIT

Vrms

mW

dB

%

dB

dB

dB

dB

dB

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

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) - DR 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.

6. Pass-Band Ripple - Any variation of the frequency response in the pass-band region.

w

PD Rev 4.3 September 2006

8

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