WM8731SEFL 데이터 시트보기 (PDF) - Wolfson Microelectronics plc

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WM8731SEFL

Portable Internet Audio CODEC with Headphone Driver and Programmable Sample Rates

Wolfson Microelectronics plc 

WM8731 / WM8731L

Production Data

Test Conditions

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

256fs unless otherwise stated.

Stereo Headphone Output

0dB Full scale output voltage

1.0 x

Vrms

Max Output Power

PO

RL = 32Ω

RL = 16Ω

AVDD/3.3

30

mW

50

Signal to Noise Ratio (Note 1, 3)

SNR

A-weighted

90

97

dB

Total Harmonic Distortion

THD

1kHz, RL = 32Ω

0.056

0.1

%

PO = 10mW rms (-5dB)

-65

60

dB

1kHz, RL = 32Ω

0.56

1.0

%

PO = 20mW rms (-2dB)

-45

40

dB

Power Supply Rejection Ratio

PSRR

1kHz 100mVpp

50

dB

20Hz - 20kHz, 100mVpp

45

Programmable Gain

1kHz

-73

0

6

dB

Programmable Gain Step Size

1kHz

1

dB

Mute attenuation

1kHz, 0dB

80

dB

Microphone Input to Headphone Output Side Tone Mode

0dB Full scale output voltage

1.0 x

Vrms

AVDD/3.3

Signal to Noise Ratio

SNR

90

95

dB

(Note 1,3)

Power Supply Rejection Ratio

PSRR

1kHz 100mVpp

50

dB

20Hz to 20kHz

45

100mVpp

Programmable Attenuation

1kHz

6

15

dB

Programmable Attenuation Step

Size

1kHz

3

dB

Mute attenuation

1kHz, 0dB

80

dB

Notes:

1. Ratio of output level with 1kHz full scale input, to the output level with the input short circuited, measured ‘A’ weighted over a 20Hz

to 20kHz bandwidth using an Audio analyser.

2. 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.

3. 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.

4. 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. 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.

w

PD Rev 4.3 August 2006

9

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