WM8978 Wolfson Microelectronics Ltd., WM8978 Datasheet - Page 7

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WM8978

Manufacturer Part Number
WM8978
Description
The WM8978 is a low power, high quality stereo codec designed for portable applications such as Digital still camera or Digital Camcorde
Manufacturer
Wolfson Microelectronics Ltd.
Datasheet

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Preliminary Technical Data
ELECTRICAL CHARACTERISTICS
w
Test Conditions
DCVDD=1.8V, AVDD=DBVDD=SPKVDD= 3.3V, T
stated.
PARAMETER
Microphone Preamp Inputs (LIP, LIN, RIP, RIN, L2, R2)
Full-scale Input Signal Level –
note this changes in proportion
to AVDD (Note 1)
Mic PGA equivalent input noise
Input resistance
MIC Programmable Gain Amplifier (PGA)
Programmable Gain
Programmable Gain Step Size
Mute Attenuation
Selectable Input Gain Boost (0/+20dB)
Gain Boost on PGA input
Gain range from AUXL/R or
L/R2 input to boost/mixer
Gain step size to boost/mixer
Auxilliary Analogue Inputs (AUXL, AUXR)
Full-scale Input Signal Level
(0dB) – note this changes in
proportion to AVDD
Input Resistance
(Note 2)
Input Capacitance
At 35.25dB
R
R
R
R
R
R
SYMBOL
AUXINRMAX
AUXINLMAX
AUXINRTYP
AUXINLTYP
AUXINRMIN
AUXINLMIN
C
R
R
R
R
C
V
V
gain
MICIN
MICIN
MICIN
MICIP
MICIN
MICIN
INFS
INFS
Guaranteed monotonic
A
beep enabled, at max gain
beep enabled, at 0dB gain
Left Input boost and mixer
Left Input boost and mixer
Left Input boost and mixer
beep enabled, at min gain
ight Input boost, mixer and
ight Input boost, mixer and
ight Input boost, mixer and
Gain set to 35.25dB
TEST CONDITIONS
INPPGAVOL = 0dB
PGABOOST = 0dB
L/RIP2INPPGA = 1
= +25
Gain set to -12dB
enabled, at max gain
enabled, at 0dB gain
enabled, at min gain
Gain set to 0dB
Boost disabled
Boost enabled
0 to 20kHz
o
C, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise
MIN
-12
-12
AVDD/3.3
0.75
39.1
TYP
150
1.0
1.6
120
4.3
8.6
47
75
94
10
20
29
10
0
0
3
0
3
6
PTD Rev 2.6 November 2005
35.25
MAX
+6
WM8978
Vrms
Vrms
UNIT
dBV
dBV
k
k
k
k
k
k
k
k
k
k
uV
pF
dB
dB
dB
dB
dB
dB
dB
pF
7