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参数资料
| 型号： | FAB2200UCX |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA25 |
| 封装： | 0.40 MM PITCH, WLCSP-25 |
| 文件页数： | 6/33页 |
| 文件大小： | 948K |
| 代理商： | FAB2200UCX |
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2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAB2200 Rev. 1.0.1
14
FAB2200
—
Audio
Subsystem
with
St
ereo
Class-G
Headph
on
eAmplifier
Class-G Headphone Amplifier with
Capacitor Free Outputs
The FAB2200 includes a regulated charge pump that
derives CPVDD and CPVSS (the headphone amplifier
power supplies) from VBATT. When the headphone
output amplitude is low, the CPVDD is 1.3V and CPVSS is
-1.3V. When needed, CPVDD and CPVSS dynamically
increase to 1.8V and -1.8V, respectively, to allow for
higher output amplitudes. The combination of an
efficient regulated charge pump and class-G operation
allows low headphone amplifier power dissipation,
resulting in longer battery run time.
The negative CPVSS rail allows the headphone amplifier
output to be centered at 0V and eliminates the need for
output DC blocking capacitors.
The FAB2200 headphone outputs can be placed in
High-Impedance Mode by setting the HIZx bits to 1 (see
Table 2
). This can be useful if the system’s headphone
jack is shared with other devices. For proper high-
impedance operation, the device must not be in
Shutdown Mode. Voltages on HPL and HPR must not
exceed ±1.8V.
Table 2.
Headphone Amplifier Output
Impedance, HIZx=1
Output Impedance ()
Frequency (KHz)
11800
40
760
6000
470
13000
Headphone Volume Control Ramp and
Zero-Crossing Detection
The HPRAMP, HPRAMPSPEED, and HPZCD bits
control the headphone amplifiers’ volume controls when
HPxVOL is changed.
Table 3. Headphone Volume Change Behavior
HPRAMP HPZCD
Behavior When HPxVOL Changes
0
Volume changes immediately.
0
1
For each channel, wait until a zero crossing occurs in the input before changing volume. If a
zero crossing does not occur within HPRAMPSPEED, volume is forced to the new setting.
1
0
Volume is ramped to the new setting at a rate of HPRAMPSPEED per step.
1
Volume is changed by one step when a zero crossing occurs. If a zero crossing does not
occur within HPRAMPSPEED, a step is forced. Only the first zero crossing within
HPRAMPSPEED triggers a volume change – volume does not change again until the next
HPRAMPSPEED.
Table 4. Headphone Volume Change Timing
HPRAMPSPEED[1:0]
Ramp and ZCD Time Between Steps (ms)
00
0.25
01
2.00
10
16.00
11
128.00
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