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參數(shù)資料
| 型號： | LMH6678 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Low Power 2-Channel Central-Office xDSL Driver |
| 中文描述： | 低功耗雙通道中環(huán)辦事處的xDSL驅動 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大?。?/td> | 1792K |
| 代理商： | LMH6678 |
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
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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| LMH6678B WAF | 制造商:Texas Instruments 功能描述: |
| LMH6678LQ | 功能描述:IC DRIVER XDSL 2CH LO PWR 24-LLP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1,000 系列:- 放大器類型:電壓反饋 電路數(shù):4 輸出類型:滿擺幅 轉換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOIC 包裝:帶卷 (TR) |
| 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 |
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