WM8955L
Production Data
ELECTRICAL CHARACTERISTICS
Test Conditions
DCVDD = 1.5V, AVDD = HPVDD = 3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DAC to Line-Out (L/ROUT1 with 10kΩ / 50pF load)
Signal to Noise Ratio
(A-weighted)
SNR
THD
AVDD = 3.3V
AVDD = 1.8V
AVDD = 3.3V
AVDD = 1.8V
1kHz signal
98
95
dB
Total Harmonic Distortion
-86
-82
100
dB
Channel Separation
dB
Analogue Mixer Inputs (LINEINL/R to L/ROUT1 with 10kΩ / 50pF load)
Full-scale Input Signal Level
VINFS
AVDD = 3.3V
AVDD = other
AVDD = 3.3V
AVDD = 1.8V
1.0
AVDD/3.3
98
V rms
dB
Signal to Noise Ratio
Line-in to Line-Out
(A-weighted)
SNR
95
Total Harmonic Distortion
THD
AVDD = 3.3V
AVDD = 1.8V
-94
-90
dB
dB
kΩ
Input Resistance
RLINEIN
PGA gain = 0dB
PGA gain = +6dB
PGA gain = 0dB
PGA gain = +6dB
any gain
20.5
10.5
10.25
5.25
20
(signal enters one mixer only)
Input Resistance
(signal enters two mixers)
MONOIN- input resistance
Mute Attenuation
RMONOIN-
kΩ
-91
dB
Analogue Outputs (LOUT1/2, ROUT1/2, MONOOUT)
0dB Full scale output voltage
AVDD/3.3
-94
Vrms
dB
Mute attenuation
1kHz, full scale signal
Channel Separation
-91
dB
Headphone Output (LOUT1/2, ROUT1/2 with 16 or 32Ω load)
Output Power per channel
Total Harmonic Distortion
PO
Output power is very closely correlated with THD; see below.
THD
HPVDD=1.8V, RL=32Ω
0.018
-75
%
PO=5mW
HPVDD=1.8V, RL=16Ω
PO=5mW
dB
0.025
-72
HPVDD=3.3V, RL=32Ω,
0.013
-78
PO=20mW
HPVDD=3.3V, RL=16Ω,
0.011
-79
PO=20mW
Signal to Noise Ratio
(A-weighted)
SNR
HPVDD = 3.3V
HPVDD = 1.8V
92
96
dB
dB
95
Speaker Output (LOUT2/ROUT2 with 8Ω bridge tied load, ROUT2INV=1)
Output Power
PO
Output power is very closely correlated with THD; see below and graphs
Total Harmonic Distortion
THD
Po=200mW, RL=8Ω,
-63
0.07
-35
1.8
95
dB
%
HPVDD=3.3V
Po=400mW, RL=8Ω
HPVDD=3.3V
Signal to Noise Ratio
(A-weighted)
SNR
HPVDD=3.3V, RL=8Ω
dB
PD Rev 4.2 March 2006
6
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
