WM8976
Pre-Production
Test Conditions
DCVDD=1.8V, AVDD=DBVDD=SPKVDD= 3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise
stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Digital to Analogue Converter (DAC) to Line-Out (LOUT1, ROUT1 with 10kΩ / 50pF load)
Full-scale output
PGA gains set to 0dB,
OUT34BOOST=0
AVDD/3.3
Vrms
PGA gains set to 0dB,
OUT34BOOST=1
A-weighted
1.5x
(AVDD/3.3)
98
Signal to Noise Ratio (Note 6)
Total Harmonic Distortion
(Note 7)
SNR
THD
dB
dB
RL = 10kΩ
-84
full-scale signal
1kHz signal
Channel Separation (Note 9)
Output Mixers (LMX1, RMX1)
PGA gain range into mixer
PGA gain step into mixer
110
dB
-15
-57
0
3
+6
+6
dB
dB
Analogue Outputs (LOUT1, ROUT1, LOUT2, ROUT2)
Programmable Gain range
0
1
dB
dB
dB
Programmable Gain step size
Monotonic
1kHz, full scale signal
Mute attenuation
85
Headphone Output (LOUT1, ROUT1 with 32Ω load)
0dB full scale output voltage
AVDD/3.3
102
Vrms
dB
%
Signal to Noise Ratio
SNR
THD
A-weighted
RL = 16Ω, Po=20mW
AVDD=3.3V
Total Harmonic Distortion
0.003
-92
dB
%
RL = 32 Ω, Po=20mW
AVDD=3.3V
0.008
- 82
dB
Speaker Output (LOUT2, ROUT2 with 8Ω bridge tied load, INVROUT2=1)
Full scale output voltage, 0dB
gain. (Note 9)
SPKBOOST=0
SPKBOOST=1
SPKVDD/3.3
Vrms
(SPKVDD/3.3)*1.5
Output Power
PO
Output power is very closely correlated with THD; see below
Total Harmonic Distortion
THD
PO =200mW, RL = 8Ω,
0.04
-68
1.0
-40
0.02
-74
1.0
-40
90
%
dB
%
SPKVDD=3.3V
PO =320mW, RL = 8Ω,
SPKVDD=3.3V
dB
%
PO =500mW, RL = 8Ω,
SPKVDD=5V
dB
%
P
O =860mW, RL = 8Ω,
SPKVDD=5V
dB
dB
Signal to Noise Ratio
SNR
SPKVDD=3.3V,
RL = 8Ω
SPKVDD=5V,
RL = 8Ω
90
dB
Power Supply Rejection Ratio
(50Hz-22kHz)
PSRR
RL = 8Ω BTL
RL = 8Ω BTL
80
69
dB
dB
SPKVDD=5V (boost)
OUT3/OUT4 outputs (with 10kΩ / 50pF load)
Full-scale output voltage, 0dB
gain (Note 9)
OUT3BOOST=0/
OUT4BOOST=0
OUT3BOOST=1
OUT4BOOST=1
A-weighted
SPKVDD/3.3
Vrms
Vrms
(SPKVDD/3.3)*1.5
Signal to Noise Ratio (Note 6)
Total Harmonic Distortion
(Note 7)
SNR
THD
98
dB
dB
RL = 10 kΩ
-84
full-scale signal
1kHz signal
Channel Separation (Note 8)
100
dB
PP Rev 3.0 April 2006
8
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
