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參數(shù)資料
| 型號： | LMH6678LQ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Low Power 2-Channel Central-Office xDSL Driver |
| 中文描述： | DUAL LINE DRIVER, QCC24 |
| 封裝： | 5 X 4 MM, LLP-24 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大?。?/td> | 1792K |
| 代理商： | LMH6678LQ |
Application Notes
FUNCTIONAL DESCRIPTION
The LMH6678 contains two pairs of high speed/high output
current operational amplifiers configured as two amplifiers
differential inputs and outputs, as shown in
Figure 1
. Quies-
cent current can be set independently for each channel via
two control bits as depicted in table 1. Also, quiescent cur-
rent can be continuously varied by selection of an external
resistor between the ADJ pin and a supply voltage of either
+12V or +3.3V.
TABLE 1. Power Mode Logic
Control
Channel A (B)
B01 (B02)
L
H
L
H
Power Mode
Full Power
2/3 Power
1/3 Power
Shutdown
Channel A and B are set independently.
Two supply voltages are required, +12V
±
10% and +3.3V
±
10%. Current for the driver amplifiers, including their output
current, flows from the 12V analog V
CC
(AV
CC
) supply and
Analog Ground (AGND.) For proper output swing and distor-
tion performance, both AV
CC
pins must be connected to
+12V and the exposed metal pad must be soldered to
ground potential as described in the layout section. Both
AV
DD
and DV
DD
pins must be connected to +3.3V. The
internal bias circuitry is powered from AV
DD
and AGND while
the digital circuitry and charge pump are powered from DV
DD
and DGND. This allows separate bypassing and decoupling
for AV
DD
and DV
DD
.
B11 (B12)
L
L
H
H
All supply voltage pins need a 0.1 μF ceramic capacitor in
parallel with a 4.7 μF capacitor as bypass capacitors. The
0.1 μF capacitor should be as close as possible to the supply
voltage pin and the larger capacitor placed next to it.
The LMH6678 delivers very low power consumption at a
single +12V analog supply voltage by a combination of its
circuit architecture and the on-chip dual charge pump. The
output stage is an emitter-follower type, which can provide
low distortion, low quiescent current and high peak output
currents.
The charge pumps generate two internal dc voltages, V
HIGH
= +15V and V
= 3V. As shown in
Figure 2
, V
and
V
supply base currents for the output stages. This en-
ables the drivers to swing within a V
(sat) of V
CC
and
ground, giving the LMH6678 its high swing of +11.5 V
PP
into
a 31
load.
20084041
FIGURE 1. Functional Block Diagram
L
www.national.com
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMH6678LQX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Power 2-Channel Central-Office xDSL Driver |
| LMH6682 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:190MHz Single Supply, Dual and Triple Operational Amplifiers |
| LMH6682MA | 制造商:Texas Instruments 功能描述:OP Amp Dual Volt Fdbk ±6V/12V 8-Pin SOIC N Rail 制造商:Texas Instruments 功能描述:AMP, VIDEO DUAL, SMD, SOIC8, 6682 |
| LMH6682MA/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6682MAX | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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