Production Data
WM8912
CHARGE PUMP
PARAMETER
TEST CONDITIONS
MIN
TYP
260
MAX
UNIT
μs
V
Start-up Time
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
μF
(between CPCA and CPCB)
CPVOUTN Capacitor
CPVOUTP Capacitor
at 2V
at 2V
2
2
2.2
2.2
μF
μF
FLL
PARAMETER
Input Frequency
SYMBOL
TEST CONDITIONS
FLL_CLK_REF_DIV = 00
FLL_CLK_REF_DIV = 01
MIN
0.032
0.064
TYP
MAX
13.5
27
UNIT
MHz
MHz
ms
FREF
Lock time
2
Free-running mode start-up time
Free-running mode frequency accuracy
VMID enabled
100
+/-10
μs
%
Reference supplied
initially
No reference provided
+/-30
%
OTHER PARAMETERS
VMID Reference
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Midrail Reference Voltage (VMID pin)
-3%
AVDD/2
890
+3%
V
Charge up time (from fully discharged
to +5% or -10% of VMID)
External capacitor
μs
4.7μF
Digital Inputs / Outputs
PARAMETER
Input HIGH Level
SYMBOL
VIH
TEST CONDITIONS
MIN
TYP
MAX
UNIT
0.7×DBVDD
V
V
V
V
Input LOW Level
Output HIGH Level
Output LOW Level
VIL
0.3×DBVDD
0.1×DBVDD
VOH
IOH = +1mA
IOL = -1mA
0.9×DBVDD
VOL
PD, Rev 4.0, September 2010
11
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
