WM8974 Просмотр технического описания (PDF) - Wolfson Microelectronics plc

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WM8974

MONO CODEC WITH SPEAKER DRIVER

Wolfson Microelectronics plc 

WM8974

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TERMINOLOGY

1. MICN input only in single ended microphone configuration. Maximum input signal to MICP without distortion is -3dBV.

2. Hold Time is the length of time between a signal detected being too quiet and beginning to ramp up the gain. It does

not apply to ramping down the gain when the signal is too loud, which happens without a delay.

3. Ramp-up and Ramp-Down times are defined as the time it takes for the PGA to change it’s gain by 6dB.

4. All hold, ramp-up and ramp-down times scale proportionally with MCLK

5. 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).

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

7. The maximum output voltage can be limited by the speaker power supply. If MONOBOOST=1 then SPKVDD should

be 1.5xAVDD or higher to prevent clipping taking place in the output stage.

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PP Rev 1.1 September 2004

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