Production Data
WM8956
Test Conditions
DCVDD = 1.8V, DBVDD = 3.3V, AVDD = SPKVDD1 = SPKVDD2 = 3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, PGA gain = 0dB,
24-bit audio data unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
dB
DAC to Line-Out (HP_L or HP_R with 10k / 50pF load)
Signal to Noise Ratio
(A-weighted)
SNR
THD+N
THD
AVDD=3.3V
AVDD=2.7V
90
99
98
Total Harmonic Distortion Plus
Noise
AVDD=3.3V
-85
-90
-87
-92
110
-80
-80
dB
AVDD=2.7V
Total Harmonic Distortion
AVDD=3.3V
dB
AVDD=2.7V
Channel Separation
1kHz full scale signal
dB
DAC to Line-Out (OUT3 with 10k / 50pF load)
Signal to Noise Ratio
(A-weighted)
SNR
THD+N
THD
AVDD=3.3V
AVDD=2.7V
99
98
dB
Total Harmonic Distortion Plus
Noise
AVDD=3.3V
-85
-90
-87
-92
110
dB
AVDD=2.7V
Total Harmonic Distortion
AVDD=3.3V
dB
AVDD=2.7V
Channel Separation
1kHz full scale signal
dB
Headphone Output (HP_L, HP_R, using capacitors unless otherwise specified)
Output Power per channel
PO
Output power is very closely correlated with THD; see below.
Total Harmonic Distortion Plus
Noise
THD+N
AVDD=2.7V, RL=32
-78
0.013
-75
dB
%
PO=5mW
AVDD=2.7V, RL=16
PO=5mW
0.018
-72
AVDD=3.3V, RL=32,
PO=20mW
0.025
-70
AVDD=3.3V, RL=16,
PO=20mW
0.032
99
Signal to Noise Ratio
(A-weighted)
SNR
AVDD = 3.3V
AVDD = 2.7V
92
dB
98
Speaker Outputs (DAC to SPK_LP, SPK_LN, SPK_RP, SPK_RN with 8 bridge tied load)
Output Power
PO
Output power is very closely correlated with THD; see below
Total Harmonic Distortion Plus
Noise
THD+N
P
O =200mW, RL = 8,
-78
dB
%
SPKVDD1=SPKVDD2
0.013
(DAC to speaker outputs)
=3.3V; AVDD=3.3V
PO =320mW, RL = 8,
SPKVDD1=SPKVDD2
-72
dB
%
0.025
=3.3V; AVDD=3.3V
PO =500mW, RL = 8,
SPKVDD1=SPKVDD2
-75
dB
%
0.018
=5V; AVDD=3.3V
PO =1W, RL = 8,
SPKVDD1=SPKVDD2
-70
dB
%
0.032
=5V; AVDD=3.3V
PD, November 2011, Rev 4.1
7
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
