WM8951L 데이터 시트보기 (PDF) - Wolfson Microelectronics plc
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WM8951L Datasheet PDF : 42 Pages
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Production Data
WM8951
Test Conditions
AVDD1, AVDD2, DBVDD = 3.3V, AGND1, AGND2 = 0V, DCVDD = 1.5V, DGND = 0V, TA = +25oC, Slave Mode, fs = 48kHz,
XTI/MCLK = 256fs unless otherwise stated.
Microphone Input to ADC @ 0dB Gain, fs = 48kHz (40kΩ Source Impedance. See Figure 11)
Input Signal Level (0dB)
VINMIC
1.0
Vrms
AVDD/3.3
Signal to Noise Ratio
SNR
AVDD1/2= DBVDD=1.8V
80
dB
(Note 1,3)
DCVDD=1.5V
A-weighted, 0dB gain
Dynamic Range (Note 3)
DR
AVDD1/2= DBVDD=1.8V
70
dB
DCVDD=1.5V
A-weighted, -60dB full
scale input
Total Harmonic Distortion
THD
AVDD1/2= DBVDD=1.8V
-55
dB
DCVDD=1.5V
0dB input, 0dB gain
Power Supply Rejection Ratio
PSRR
1kHz 100mVpp
50
dB
20Hz to 20kHz
45
dB
100mVpp
Programmable Gain Boost
MICBOOST bit
1kHz input
34
dB
set
Rsource < 50 Ohms
Mic Path gain (MICBOOST gain
MICBOOST = 0
14
dB
is additional to this nominal
gain)
Rsource < 50Ω
Mute attenuation
0dB, 1kHz input
80
dB
Input Resistance
RINMIC
10k
Ω
Input Capacitance
CINMIC
10
pF
Microphone Bias
Bias Voltage
VMICBIAS
0.75*AVDD1 0.75*AVDD1 0.75*AVDD1
V
–100mV
+ 100mV
Bias Current Source
IMICBIAS
3
mA
Output Noise Voltage
Vn
1K to 20kHz
25
nV/√Hz
Notes:
1. Ratio of output level with 1kHz full scale input, to the output level with the input short circuited, measured ‘A’ weighted over a 20Hz
to 20kHz bandwidth using an Audio analyser.
2. 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.
3. 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.
4. 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. 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.
w
PD Rev 4.1 December 2007
7
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