wm9001 Wolfson Microelectronics plc, wm9001 Datasheet - Page 9

• Manufacturer Part Number: wm9001
• Description: 1w Dual-mode Class Ab/d Speaker Driver
• Manufacturer: Wolfson Microelectronics plc

Pre-Production
TERMINOLOGY
1.
2.
3.
4.
5.
w
Test Conditions
AVDD = 3.3V; SPKVDD = 5V, T
Input / Output (for hardware control)
Input HIGH Level (BSEL, CDMODE)
Input HIGH Level (EN, SYNC)
Input LOW Level
Input capacitance
Input leakage
Oscillator
Free-running oscillator frequency
External clock frequency range
Power-Up Time (Based on recommended Vmid capacitor value; these times will vary with different capacitors)
Class AB Enable time
Class D Enable time
Signal-to-Noise Ratio (dB) – SNR is a measure of the difference in level between the maximum theoretical full scale
output signal and the output with no input signal applied.
Total Harmonic Distortion (dB) – THD is the level of the rms value of the sum of harmonic distortion products relative
to the amplitude of the measured output signal.
Total Harmonic Distortion plus Noise (dB) – THD+N is the level of the rms value of the sum of harmonic distortion
products plus noise in the specified bandwidth relative to the amplitude of the measured output signal.
All performance measurements carried out with 20kHz low pass filter, and where noted an A-weighted filter. Failure to
use such a filter will result in higher THD and lower SNR readings than are found in the Electrical Characteristics. The
low pass filter removes out of band noise; although it is not audible it may affect dynamic specification values.
Mute Attenuation – This is a measure of the difference in level between the full scale output signal and the output with
mute applied.
PARAMETER
A
= +25
o
C, 1kHz input signal, BSEL[2:0] = 000 unless otherwise stated.
Vmid capacitor = 4.7μF
Vmid capacitor = 4.7μF
TEST CONDITIONS
0.7×AVDD
-0.9
MIN
600
600
1.6
TYP
800
800
400
100
10
PP, June 2009, Rev 3.2
0.3×AVDD
1000
1000
MAX
0.9
WM9001
UNIT
kHz
kHz
ms
ms
pF
uA
V
V
V
9