WM8985 Datasheet, PDF (12/118 Pages) Wolfson Microelectronics plc – Multimedia CODEC With Class D Headphone and Line Out

WM8985
Pre-Production
Test Conditions
DCVDD=1.8V, AVDD1=AVDD2=DBVDD=3.3V, TA = +25^oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DAC to left and right mixer into headphone 16Ω load on LOUT2 and ROUT2, Class AB mode
LOUT2VOL, ROUT2VOL, DACLVOL and DACRVOL = 0dB
Full-scale output
Signal to Noise Ratio ³
SNR
A-weighted
AVDD1/3.3
Vrms
97
dB
AVDD1=AVDD2=3.3V
22Hz to 20kHz
95.5
dB
Total Harmonic Distortion ⁴
THD
AVDD1=AVDD2=3.3V
Po = 20mW, RL=16Ω
-79
-70
dBFS
Total Harmonic Distortion + Noise ⁵
THD+N
Po = 20mW, RL=16Ω
-75
TBC
dBFS
Channel Separation ⁶
1kHz signal
100
dB
DAC to left and right mixer into headphone 16Ω load on LOUT2 and ROUT2, Class D mode, Lfilter = 33nH Cfilter = 220nf
LOUT2VOL, ROUT2VOL, DACLVOL and DACRVOL = 0Db
Full-scale output
Signal to Noise Ratio ³
AVDD1/3.3
Vrms
SNR
A-weighted
80
90
dB
AVDD1=AVDD2=3.3V
Total Harmonic Distortion ⁴
THD
Po = 20mW, RL=16Ω
-79
dBFS
Channel Separation ⁶
1kHz signal
100
PWM Rise Time
1.5
PWM Fall Time
1.5
PWM Switching Frequency
DCLKDIV = 1000
1.4
Efficiency
RL = 16Ω, tPW = 20ns,
72
PO = 20mW
Power Supply Rejection
PSRR
100mVpp ripple @217Hz
70
injected on AVDD2
Idle Current
No analogue output signal
0.5
on either channel
Bypass paths to left and right output mixers. BYPL2LMIX = 1 and BYPR2RMIX = 1
PGA gain range into mixer
Gain adjusted by
-15
0
BYPLMIXVOL and
BYPRMIXVOL
BYPLMIXVOL and BYPRMIXVOL
3
gain step into mixer
Mute attenuation
BYPL2LMIX = 0
100
BYPR2RMIX = 0
Analogue outputs (LOUT1, ROUT1, LOUT2, ROUT2)
Programmable Gain range
Gain adjusted by
-57
0
L/ROUT1VOL and
L/ROUT2VOL
Programmable Gain step size
Monotonic
1
Mute attenuation
1kHz, full scale signal
85
L/ROUT1MUTE = 1
L/ROUT2MUTE = 1
dB
ns
ns
MHz
%
dB
mA
+6
dB
dB
dB
+6
dB
dB
dB
w
PP, Rev 3.4, October 2006
12