WM8978 Wolfson Microelectronics Ltd., WM8978 Datasheet - Page 8

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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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WM8978
w
Test Conditions
DCVDD=1.8V, AVDD=DBVDD=SPKVDD= 3.3V, T
stated.
PARAMETER
Automatic Level Control (ALC)
Target Record Level
Programmable gain
Gain Hold Time (Note 3,5)
Gain Ramp-Up (Decay) Time
(Note 4,5)
Gain Ramp-Down (Attack) Time
(Note 4,5)
Mute Attenuation
Analogue to Digital Converter (ADC)
Signal to Noise Ratio (Note 6)
Total Harmonic Distortion
(Note 7)
Channel Separation (Note 9)
Digital to Analogue Converter (DAC) to Line-Out (LOUT1, ROUT1 with 10k
Full-scale output
Signal to Noise Ratio (Note 6)
Total Harmonic Distortion
(Note 7)
Channel Separation (Note 8)
Output Mixers (LMX1, RMX1)
PGA gain range into mixer
PGA gain step into mixer
Analogue Outputs (LOUT1, ROUT1, LOUT2, ROUT2)
Programmable Gain range
Programmable Gain step size
Mute attenuation
Headphone Output (LOUT1, ROUT1 with 32
0dB full scale output voltage
Signal to Noise Ratio
Total Harmonic Distortion
SYMBOL
SNR
SNR
THD
THD
t
SNR
THD
t
HOLD
t
DCY
ATK
load)
A
ALCMODE=1 (limiter),
ALCMODE=1 (limiter),
PGA gains set to 0dB,
PGA gains set to 0dB,
R
1kHz, full scale signal
A-weighted, 0dB gain
R
ALCMODE=0 (ALC),
ALCMODE=0 (ALC),
MCLK = 12.288MHz
TEST CONDITIONS
MCLK=12.288MHz
MCLK=12.288MHz
MCLK=12.288MHz
MCLK=12.288MHz
= +25
L
L
OUT34BOOST=0
OUT34BOOST=1
1kHz input signal
= 32
full-scale signal
= 16 , Po=20mW
-3dBFS input
AVDD=3.3V
AVDD=3.3V
1kHz signal
A-weighted
A-weighted
R
Monotonic
(Note 3)
(Note 3)
(Note 3)
(Note 3)
(Note 3)
o
L
C, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise
= 10k
, Po=20mW
-22.5
MIN
-12
0, 2.67, 5.33, 10.67, … , 43691
-15
-57
(time doubles with each step)
(time doubles with each step)
(time doubles with each step)
(time doubles with each step)
(time doubles with each step)
/ 50pF load)
0.73, 1.45, 2.91, … , 744
0.83, 1.66, 3.33, … , 852
0.18, 0.36, 0.73, … , 186
3.3, 6.6, 13.1, … , 3360
(AVDD/3.3)
AVDD/3.3
AVDD/3.3
0.003
0.008
1.5x
TYP
120
110
110
102
- 82
-84
-84
-92
95
98
85
0
3
0
1
PTD Rev 2.6 November 2005
Preliminary Technical Data
35.25
MAX
-1.5
+6
+6
Vrms
Vrms
UNIT
ms
ms
ms
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
%
%
8