WM8904
Pre-Production
BYPASS PATH
Differential Stereo Line Input to Stereo Line Output- IN2L-IN3L / IN2R-IN3R pins to LINEOUTL+LINEOUTR pins with 10k /
50pF load
Test conditions:
L_MODE = R_MODE = 01b (Differential Line)
LIN_VOL = RIN_VOL = 00101b (0dB)
LINEOUTL_VOL = LINEOUTR_VOL = 111001b (0dB)
Total signal path gain = 0dB
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
1.0
0
MAX
UNIT
Vrms
dBV
Full Scale Output Signal Level
2.83
Vpk-pk
Signal to Noise Ratio
SNR
A-weighted
90
100
-92
90
dBV
dBV
Total Harmonic Distortion + Noise
Channel Separation
THD+N
-1dBV input
-85
1kHz signal, -1dBV
10kHz signal, -1dBV
1kHz signal, -1dBV
217Hz, 100mV pk-pk
dB
80
Channel Level Matching
+/-1
45
dB
dB
Power Supply Rejection Ratio
PSRR
CHARGE PUMP
PARAMETER
Start-up Time
TEST CONDITIONS
MIN
TYP
260
MAX
UNIT
s
V
CPCA
Normal mode
Low power mode
Normal mode
CPVDD
CPVDD/2
-CPVDD
-CPVDD/2
V
CPCB
V
Low power mode
V
External component requirements
To achieve specified headphone output power and performance
Flyback Capacitor
at 2V
1
2.2
F
(between CPCA and CPCB)
CPVOUTN Capacitor
CPVOUTP Capacitor
at 2V
at 2V
2
2
2.2
2.2
F
F
FLL
PARAMETER
Input Frequency
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
FREF
FLL_CLK_REF_DIV =
00
0.032
13.5
MHz
FLL_CLK_REF_DIV =
01
0.064
27
MHz
Lock time
2
ms
s
%
Free-running mode start-up time
VMID enabled
100
+/-10
Free-running mode frequency
accuracy
Reference supplied
initially
No reference provided
+/-30
%
PP, Rev 3.3, September 2012
18
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
