wm8952 Wolfson Microelectronics plc, wm8952 Datasheet - Page 6

• Manufacturer Part Number: wm8952
• Description: Mono Adc With Microphone Pre-amplifier
• Manufacturer: Wolfson Microelectronics plc

WM8952
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ELECTRICAL CHARACTERISTICS
Test Conditions
DCVDD=1.8V, DBVDD=3.3V, AVDD=3.3V, T
PARAMETER
Microphone Input PGA Inputs (MICN, MICP)
INPPGAVOL and PGABOOST = 0dB
Full-scale Input Signal Level – Single-
ended input via LIN/RIN
Full-scale Input Signal Level –
Pseudo-differential input
Input PGA equivalent input noise
MICN input resistance
MICN input resistance
MICN input resistance
MICP input resistance
Input Capacitance
Maximum Input PGA Programmable
Gain
Minimum Input PGA Programmable
Gain
Programmable Gain Step Size
Input PGA Mute Attenuation
Input Gain Boost
Input Gain Boost
Auxiliary Analogue Input (AUX)
Full-scale Input Signal Level
Input Resistance
Input Capacitance
Maximum Gain from AUX input PGA
mixers
Minimum Gain from AUX input PGA
mixers
AUX2BOOSTVOL step size
Analogue to Digital Converter (ADC) - Input from MICN and MICP in differential configuration to input PGA
INPPGAVO, PGABOOST and ADCVOL = 0dB
Signal to Noise Ratio
Total Harmonic Distortion
Total Harmonic Distortion + Noise
Microphone Bias
Bias Voltage
Bias Current Source
Output Noise Voltage
3
1
1,2
4
2
5
SYMBOL
THD+N
SNR
THD
A
= +25
o
C, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated.
INPPGAVOL = +35.25dB
INPPGAVOL = +35.25dB
for V
All analogue input pins
Guaranteed monotonic
Guaranteed monotonic
INPPGAVOL = -12dB
Input boost and mixer
enabled, at 0dB gain
INPPGAVOL = 0dB
All analogue Inputs
TEST CONDITIONS
AUX2BOOSTVOL
AUX2BOOSTVOL
Gain adjusted by
Gain adjusted by
PGABOOST = 1
Gain adjusted by
Gain adjusted by
All gain settings
PGABOOST= 0
No input signal
INPPGAMUTE
1kHz to 20kHz
MICBIAS
INPPGAVOL
INPPGAVOL
AVDD=3.3V
AVDD=3.3V
AVDD=3.3V
-1dBV Input
-1dBV Input
MBVSEL=0
MBVSEL=1
A-weighted
0 to 20kHz
within +/-3%
+33.25
-14.00
-14.00
AVDD
+4.00
0.85*
81
MIN
0.65*AVDD
AVDD*0.7/
0.9*AVDD
AVDD/3.3
AVDD/3.3
+35.25
124.5
76.5
58.5
97.5
0.75
3.3
-12
10
91
-83
-77
15
TYP
+20
2
-12
92
20
10
+6
0
3
PP, Rev 3.0, December 2008
+37.25
-10.00
AVDD
0.95*
+7.50
-9.00
-74
-68
MAX
3
Pre Production
nV/√Hz
V
V
V
mA
UNIT
kΩ
kΩ
kΩ
kΩ
kΩ
dB
pF
dB
dB
dB
dB
dB
dB
pF
dB
dB
dB
dB
dB
dB
V
V
rms
rms
rms
6