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參數(shù)資料
| 型號： | G1421 |
| 英文描述： | 2-W stereo audio power OP amplifier with no headphone coupling capacitor function.|OP Amplifier Series |
| 中文描述： | 2 - W型立體聲音頻功率運算放大器，耦合電容沒有耳機功能。|任擇議定書放大器系列 |
| 文件頁數(shù)： | 29/31頁 |
| 文件大小： | 825K |
| 代理商： | G1421 |
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Ver: 1.1
May 23, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
29
G1421
Global Mixed-mode Technology Inc.
HP-IN Mode Operation
An internal weakly pull-up circuit is connected to
HP-IN control pin (pin 17). When this pin is left un-
connected or tied to VDD, HP-IN mode is activated,
ignoring SE/ BTL setting. In normal SE/ BTL mode
operations, this HP-IN pin should be tied to GND. In
HP-IN mode, the linear amplifiers of LOUT+ (pin 3)
/ROUT+ (pin 22) are still alive, the linear amplifier of
ROUT- (pin 15) is deactivated, the linear amplifier of
LOUT- (pin 10) supplies VDD/2 on this pin to cancel
the dc offsets. (Please refer to Logical Truth Table and
No DC CAP Application Circuit for detailed operation.)
If connected VDD/2 on the LOUT- (pin 10) to the
phone jacket, the dc offset can be eliminated without
using coupling capacitors in headphone applications.
By using HP-IN mode, cost and PCB space can be
further minimized than traditional headphone applica-
tions with coupling capacitors. The HP-IN configura-
tion is shown on Figure 4.
Short circuit protection is implemented on LOUT-
(pin10) to avoid the short-circuit damage caused by
the sleeve of the phone jack connected to ground ac-
cidentally during the module assembling. When
short-circuit is detected, the linear amplifier of LOUT-
(pin 10) will turn off for a period. After this period, it
activates again. If the short circuit condition still exists,
it will be turned off again. With this protection, the
damage caused by larger dc short circuit current (from
VDD/2 to GND) can be avoided.
MUTE and SHUTDOWN Mode Operations
G1421 implements the mute and shutdown mode
operations to reduce supply current, I
DD,
to the ab-
solute minimum level during nonuse periods for
battery-power conservation. When the shutdown pin
(pin 8) is pulled high, all linear amplifiers will be de-
activated to mute the amplifier outputs. And G1421
enters an extra low current consumption state, I
DD
is
smaller than 5
μ
A. If pulling mute-in pin (pin 11) high,
it will force the activated linear amplifier to supply
the VDD/2 dc voltage on the output to mute the AC
performance. In mute mode operation, the current
consumption will be a little different between BTL,
SE and HP-IN modes. (SE < HP-IN < BTL) Typically,
the supply current is about 2.5mA in BTL mute op-
eration. Shutdown and Mute-In pins should never be
left unconnected, this floating condition will cause
the amplifier operations unpredictable.
Maximum Power Clampping Function
G1421 supports the maximum output power clamping
function to avoid damaging the speaker when the
amplifier output a power beyond the speaker tolerance.
The Vol pin (pin 23) is weakly pull-low internally. If
inputting a non-zero voltage (low boundary voltage) to
the Vol pin, G1421 will generate a high boundary
voltage which the difference between the VDD/2 and
the high boundary voltage is the same as the differ-
ence between the VDD/2 and the low boundary volt-
age. ( i.e. V
OH
–
VDD/2 = VDD/2 – V
OL
) Then the out-
puts of linear amplifiers will be effectively limited be-
tween the high/low boundary voltage, the maximum
output power is clamped. By setting the voltage of Vol,
the maximum output power can be well controlled.
When the maximum power clamping function is not
used, the Vol pin should be floated or tied to GND.
VDD
Vo(PP)+VDD/2
VDD/2
Vo(PP)
VDD/2
R
L
Figure 4
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| G1421F | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:2W Stereo Audio Amplifier with No Headphone Coupling Capacitor Function |
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| G1-422-122 | 制造商:HECON / DANAHER 功能描述: |
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