WM8976GEFL/V Wolfson Microelectronics, WM8976GEFL/V Datasheet - Page 9

• Manufacturer Part Number: WM8976GEFL/V
• Description: Audio CODECs Mono ADC Stereo DAC with Spkr
• Manufacturer: Wolfson Microelectronics

Specifications of WM8976GEFL/V

• Mounting Style: SMD/SMT
• Package / Case: QFN-32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Production Data
TERMINOLOGY
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w
Test Conditions
DCVDD=1.8V, AVDD=DBVDD=SPKVDD= 3.3V, T
PARAMETER
OUT3/OUT4 outputs (with 10kΩ / 50pF load)
Full-scale output voltage, 0dB
gain (Note 9)
Signal to Noise Ratio (Note 6)
Total Harmonic Distortion
(Note 7)
Channel Separation (Note 8)
Power Supply Rejection Ratio
(50Hz-22kHz)
Microphone Bias
Bias Voltage
Bias Current Source
Output Noise Voltage
Digital Input / Output
Input HIGH Level
Input LOW Level
Output HIGH Level
Output LOW Level
Input capacitance
Input leakage
Input level to LIP is limited to a maximum of -3dB or THD+N performance will be reduced.
Note when BEEP path is not enabled then AUXL and AUXR have the same input impedances.
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.
Ramp-up and Ramp-Down times are defined as the time it takes for the PGA to sweep across 90% of its gain range.
All hold, ramp-up and ramp-down times scale proportionally with MCLK
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).
THD+N (dB) – THD+N is a ratio, of the rms values, of (Noise + Distortion)/Signal.
Channel Separation (dB) – Also known as Cross-Talk. This is a measure of the amount one channel is isolated from
the other. Measured by applying a full scale signal to one channel input and measuring the level of signal apparent at
the other channel output.
The maximum output voltage can be limited by the speaker power supply.
SPKBOOST is set then SPKVDD should be 1.5xAVDD to prevent clipping taking place in the output stage (when PGA
gains are set to 0dB).
SYMBOL
V
I
PSRR
MICBIAS
SNR
THD
MICBIAS
V
V
Vn
V
V
OH
OL
IH
IL
R
A
L
TEST CONDITIONS
= +25
= 10kΩ SPKVDD=5V
OUT3BOOST=0/
OUT4BOOST=0
OUT3BOOST=1
OUT4BOOST=1
full-scale signal
1K to 20kHz
1kHz signal
MBVSEL=0
MBVSEL=1
A-weighted
R
R
I
I
o
L
OL
(boost)
OH
L
C, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated.
= 10 kΩ
= 10kΩ
=1mA
-1mA
0.7×DBVDD
0.9×DBVDD
MIN
(SPKVDD/3.3)*1.5
If OUT3BOOST, OUT4BOOST or
SPKVDD/3.3
0.65*AVDD
0.9*AVDD
TYP
100
-84
98
52
56
15
10
50
0.3×DBVDD
0.1xDBVDD
MAX
PD Rev 4.4 July 2009
3
WM8976
nV/√Hz
Vrms
Vrms
UNIT
mA
dB
dB
dB
dB
dB
pF
pA
V
V
V
V
V
V
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