- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄60231 > G1201 (Global Mixed-mode Technology Inc.) Rail-to-Rail I/O, 100mA Output Single-Supply Amplifiers PDF資料下載
參數(shù)資料
| 型號： | G1201 |
| 廠商： | Global Mixed-mode Technology Inc. |
| 英文描述： | Rail-to-Rail I/O, 100mA Output Single-Supply Amplifiers |
| 中文描述： | 軌至軌I / O，100mA輸出單電源放大器 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 258K |
| 代理商： | G1201 |
Ver 1.1
Mar 15, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
4
G1201
Global Mixed-mode Technology Inc.
Input Overvoltage Protection
As with any semiconductor device, whenever the con-
dition exists for the input to exceed either supply volt-
age, the device’s input overvoltage characteristic must
be considered. When an overvoltage occurs, the am-
plifier could be damaged depending on the magnitude
of the applied voltage and the magnitude of the fault
current. Although not shown here, when the input
voltage exceeds either supply by more than 0.6V,
pn-junctions internal to the G1201 energize allowing
current to flow from the input to the supplies. the
G1201 does not have any internal current limiting re-
sistors, so fault currents can quickly rise to damaging
levels.
This input current is not inherently damaging to the
device as long a it is limited to 5 mA or less. For the
G1201, once the input voltage exceeds the supply by
more than 0.6V the input current quickly exceeds 5
mA. If this condition continues to exist, an external
series resistor should be added. The size of the resis-
tor is calculated by dividing the maximum overvoltage
by 5 mA. For example, if the input voltage could reach
10V, the external resistor should be (10V/ 5mA) = 2k
.
This resistance should be placed in series with either
or both inputs if they are exposed to an overvoltage
condition.
A Single-Supply Headphone Amplifier
Because of its speed and large output drive, the
G1201 make an excellent headphone driver, as illus-
trated in Figure 2. Its low supply operation and
rail-to-rail inputs and outputs give a maximum signal
swing on a single +5V supply. To ensure maximum
signal swing available to drive the headphone, the
amplifier inputs are biased to V+/2, which in this case
is 2.5V. The 100k
resistor to the positive supply is
equally split into two 50 k
resistors, with their com-
mon point bypassed by 10F to prevent power supply
noise from contaminating the audio signal.
The audio signal is then ac-coupled to each input
through a 10F capacitor. A large value is needed to
ensure that the 20Hz audio information is not blocked.
If the input already has the proper dc bias, the ac cou-
pling and biasing resistors are not required. A 270F
capacitor is used at the output to couple the amplifier
to the headphone. This value is much larger than that
used for the input because of the low impedance of
the head-phones, which can range from 32
to 600.
An additional 16
resistor is used in series with the
output capacitor to protect the op amp’s output stage
by limiting capacitor discharge current. When driving a
32
load, the circuit exhibits less than 0.3% THD+N at
output drive levels of 4.2 VP-P.
Figure 2. A Single-Supply, Stereo Headphone Driver
+
1/2
G1201
_
+
LEFT
INPUT
50k
+
10F
100k
50k
+V + 5V
1F 0.1 F
16
+
270F
50k
LEFT
HEADPHONE
+
1/2
G1201
_
+
RIGHT
INPUT
50k
+
10F
100k
50k
+V
16
+
270F
50k
RIGHT
HEADPHONE
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| G1212 | Rail-to-Rail I/O OP Amp |
| G1213F | Low power, Single, SOT-23-5, Rail-to-rail OP Amp |
| G1214T12UF | Rail-to-Rail I/O, High-Slew-Rate OP Amp |
| G1214T12U | Rail-to-Rail I/O, High-Slew-Rate OP Amp |
| G1214T1UF | Rail-to-Rail I/O, High-Slew-Rate OP Amp |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| G1201/2 BK002 | 制造商:Alpha Wire Company 功能描述:SLEEVE BRAIDED PE 1/2 BK 500' 制造商:Alpha Wire Company 功能描述:SLEEVING, EXPANDABLE BRAID, 19.05MM, BLACK, 500FT; Sleeving / Tubing Type:Expandable; Internal Diameter:19.05mm; Leaded Process Compatible:No; Peak Reflow Compatible (260 C):No; Body Material:Polyester; Color:Black; Drop Ship:Yes ;RoHS Compliant: Yes |
| G1201/2 BK005 | 制造商:Alpha Wire Company 功能描述:SLEEVE BRAIDED PE 1/2 BK 100' 制造商:Alpha Wire Company 功能描述:SLEEVING, EXPANDABLE BRAID, 6.35MM, BLACK, 100FT; Sleeving / Tubing Type:Expandable; Length:30.5m; Sleeving Material:Polyester; Internal Diameter:6.35mm; Sleeving Color:Black; Leaded Process Compatible:No; Approval Bodies:UL ;RoHS Compliant: Yes |
| G1201/2 WH005 | 功能描述:非熱縮管和套管 EXPAND. SLEEVE 1/2in 100ft SPOOL WHT RoHS:否 制造商:Panduit 產(chǎn)品:Cable Wraps 類型:Spiral 顏色:Black 材料:PP 內(nèi)徑:0.03 in 長度:100 ft |
| G1201/2-BK002 | 制造商:Alpha Wire 功能描述: |
| G1201/2-BK005 | 制造商:Alpha Wire 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。