WM8950GEFL/V Ver la hoja de datos (PDF) - Wolfson Microelectronics plc
Número de pieza
componentes Descripción
Fabricante
WM8950GEFL/V Datasheet PDF : 52 Pages
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Preliminary Technical Data
WM8950
Test Conditions
DCVDD = 1.8V, AVDD = DBVDD = 3.3V, SPKVDD = 3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless
otherwise stated.
PARAMETER
Microphone Bias
Bias Voltage (MBVSEL=0)
Bias Voltage (MBVSEL=1)
Bias Current Source
Output Noise Voltage
Digital Input / Output
Input HIGH Level
Input LOW Level
Output HIGH Level
Output LOW Level
SYMBOL TEST CONDITIONS
MIN
TYP
MAX
UNIT
VMICBIAS
VMICBIAS
IMICBIAS
Vn
1K to 20kHz
0.9*AVDD
0.75*AVDD
3
15
V
V
mA
nV/√Hz
VIH
0.7×DVDD
VIL
VOH
IOL=1mA
0.9×DVDD
VOL
IOH-1mA
V
0.3×DVDD
V
V
0.1xDVDD
V
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.
w
PTD Rev 2.1 June 2005
7
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