WM8753L
Advanced Information
Test Conditions
DCVDD = 1.5V, AVDD = HPVDD = DBVDD = SPKRVDD = PLLVDD = 3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 24-bit audio
data unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Microphone Bias
Bias Voltage (MBVSEL=0)
VMICBIAS
VMICBIAS
-3%
-3%
0.9*AVDD
+3*%
+3*%
3
V
V
Bias Voltage (MBVSEL=1)
0.75*AVDD
Bias Current Source
Output Noise Voltage
IMICBIAS
Vn
mA
1K to 20kHz
15
nV/√Hz
Digital Input / Output (excluding GPIO4)
Input HIGH Level
Input LOW Level
Output HIGH Level
Output LOW Level
GPIO4 Input
VIH
VIL
0.7×DBVDD
0.9×DBVDD
V
V
V
V
0.3×DBVDD
0.1×DBVDD
VOH
VOL
IOL=1mA
IOH-1mA
Input HIGH Level
Input LOW Level
VIH
VIL
1.4
V
V
0.8
TERMINOLOGY
1. 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.
2. Ramp-up and Ramp-Down times are defined as the time it takes for the PGA to sweep across 90% of its gain range.
3. All hold, ramp-up and ramp-down times scale proportionally with MCLK
4. 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).
5. 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).
6. THD+N (dB) - THD+N is a ratio, of the rms values, of (Noise + Distortion)/Signal.
7. 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.
AI Rev 3.1 June 2004
w
9
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
