XWM8721EDS Ver la hoja de datos (PDF) - Wolfson Microelectronics plc

Número de pieza

componentes Descripción

Fabricante

XWM8721EDS

Internet Audio DAC with Integrated Headphone Driver

Wolfson Microelectronics plc 

Production Data

WM8721 / WM8721L

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.

POWER CONSUMPTION

MODE DESCRIPTION

CURRENT CONSUMPTION

DAC Playback

Standby

Power Down

AVDD HPVDD

(3.3V) (3.3V)

000

3.5

1.7

011

17

0.4

111

0.4

0.3

Table 1 Powerdown Mode Current Consumption Examples

DCVDD

(1.5V)

1.3

0.7

0.7

DBVDD

(3.3V)

0.1

0.2

0.1

Notes:

1. TA = +25oC. Slave Mode, fs = 48kHz, MCLK = 256fs (12.288MHz).

2. All figures are quiescent, with no signal.

3. The power dissipation in the headphone itself not included in the above table.

UNITS

mA

µA

µA

w

PD Rev 4.0 November 2004

7

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