wm8941 Wolfson Microelectronics plc, wm8941 Datasheet - Page 8

• Manufacturer Part Number: wm8941
• Description: Mono Codec With Speaker Driver And Video Buffer
• Manufacturer: Wolfson Microelectronics plc

WM8941
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ELECTRICAL CHARACTERISTICS
Test Conditions
DCVDD=1.8V, DBVDD=3.3V, AVDD=3.3V, SPKVDD =3.3V, , VBVDD=3.3V, T
unless otherwise stated.
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 Inputs (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
3
1
1,2
4
2
5
SYMBOL
THD+N
SNR
THD
INPPGAVOL = +35.25dB
INPPGAVOL = +35.25dB
Guaranteed monotonic
Guaranteed monotonic
All analogue input pins
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
INPPGAVOL
INPPGAVOL
AVDD=3.3V
AVDD=3.3V
AVDD=3.3V
-1dBV Input
-1dBV Input
A-weighted
0 to 20kHz
A
= +25
+33.25
-14.00
-14.00
+4.00
81
o
MIN
C, 1kHz signal, fs = 48kHz, 24-bit audio data
AVDD*0.7/
AVDD/3.3
AVDD/3.3
+35.25
124.5
76.5
58.5
97.5
0.75
3.3
-12
-83
-77
10
91
TYP
+20
2
-12
92
20
10
+6
0
3
PD, Rev 4.0, August 2008
+37.25
-10.00
+7.50
-74
-68
-9.00
MAX
Production Data
V
V
V
UNIT
kΩ
kΩ
kΩ
kΩ
kΩ
dB
pF
dB
dB
dB
dB
dB
dB
pF
dB
dB
dB
dB
dB
dB
rms
rms
rms
8