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参数资料
| 型号： | G1421F |
| 厂商： | Global Mixed-mode Technology Inc. |
| 英文描述： | 2W Stereo Audio Amplifier with No Headphone Coupling Capacitor Function |
| 中文描述： | 2W立体声音频放大器耦合电容器没有耳机功能 |
| 文件页数： | 8/24页 |
| 文件大小： | 442K |
| 代理商： | G1421F |
Ver: 1.6
Aug 04, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
16
G1421
Global Mixed-mode Technology Inc.
Pin Description
PIN
NAME
I/O
FUNCTION
1,12,13,24
GND/HS
Ground connection for circuitry, directly connected to thermal pad.
2
TJ
O
Source a current inversely to the junction temperature. This pin should be left uncon-
nected during normal operation. For more information, see the junction temperature
measurement section of this document.
3
LOUT+
O
Left channel + output in BTL mode, + output in SE mode.
4
LLINE IN
I
Left channel line input, selected when HP/ pin is held low.
5
LHP IN
I
Left channel headphone input, selected when HP/pin is held high.
6
LBYPASS
Connect to voltage divider for left channel internal mid-supply bias.
7
LVDD
I
Supply voltage input for left channel and for primary bias circuits.
8
SHUTDOWN
I
Shutdown mode control signal input, places entire IC in shutdown mode when held
high, IDD = 5A.
9
MUTE OUT
O
Follows MUTE IN pin, provides buffered output.
10
LOUT-
O
Left channel - output in BTL mode, high impedance state in SE mode. Supply VDD/2 to
the phone jacket in HP-IN mode.
11
MUTE IN
I
Mute control signal input, hold low for normal operation, hold high to mute.
14
SE/
I
Mode control signal input, hold low for BTL mode, hold high for SE mode.
15
ROUT-
O
Right channel - output in BTL mode, high impedance state in SE mode.
16
HP/
I
MUX control input, hold high to select headphone inputs (5,20), hold low to select line
inputs (4,21).
17
HP-IN
This pin can activate the HP-IN mode to supplied the VDD/2 at LOUT- onto the phone
jacket. So the DC blocking capacitors can be removed in HP-IN type (like SE mode
except no DC blocking capacitors). Hold high to activate this function. If this function is
not used, it should be strongly tied to low.
18
RVDD
I
Supply voltage input for right channel.
19
RBYPASS
Connect to voltage divider for right channel internal mid-supply bias.
20
RHP IN
I
Right channel headphone input, selected when HP/pin is held high.
21
RLINE IN
I
Right channel line input, selected when HP/pin is held low.
22
ROUT+
O
Right channel + output in BTL mode, + output in SE mode.
23
VOL
I
The output power can be clamped by setting a low bound voltage to this pin. The high
bound voltage will be generated internally. The output voltage will be clamped between
high/low bound voltages. Then the output power is limited. It is weakly pull-low inter-
nally, let this pin floating or tied to GND can deactivate this function.
Thermal Pad
Recommend connecting the Thermal Pad to the GND for excellent power dissipation.
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