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參數(shù)資料
| 型號： | LT1886 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual 700MHz, 200mA Operational Amplifier |
| 中文描述： | 雙700MHz的，200mA的運(yùn)算放大器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 331K |
| 代理商： | LT1886 |
13
LT1886
APPLICATIU
Table 2. ADSL Upstream Driver Designs
W
U
U
Table 2 compares the two approaches. It may seem that
the low power design is a clear choice, but there are further
system issues to consider. In addition to driving the line,
the amplifiers provide back-termination for signals that
are received simultaneously from the line. In order to
reject the drive signal, a receiver circuit is used such as
shown in Figure 10. Taking advantage of the differential
nature of the signals, the receiver can subtract out the
drive signal and amplify the received signal. This method
works well for standard back-termination. If the back-
termination resistors are reduced by positive feedback, a
portion of the received signal also appears at the amplifier
outputs. The result is that the received signal is attenuated
–
+
8.45
1k
523
1.21k
1.21k
523
1
μ
F
–V
i
V
i
A
V
= 10
–
+
8.45
1886 F09
1k
1:1
100
R
BT
–V
a
V
a
–V
L
V
L
R
BT
1886 F10
1:n
R
L
+
–
V
BIAS
V
RX
+
–
LT1813
+
–
LT1813
R
F
R
F
R
G
R
D
R
G
R
D
R
L
n
2
= REFLECTED IMPEDANCE
R
L
2n
2
R
L
2n
2
= ATTENUATION OF V
a
+ R
BT
R
L
2n
2
R
L
2n
2
R
G
R
D
=
SET
+ R
BT
Figure 9. Power Saving ADSL Modem Driver
Figure 10. Receiver Configuration
STANDARD
100
13dBm
5.33
2
25
12.5
1dB
0.79V
RMS
31.7mA
RMS
4.21V Peak
169mA Peak
550mW
Single 12V
LOW POWER
100
13dBm
5.33
1
100
8.35
0.5dB
0.87V
RMS
15mA
RMS
4.65V Peak
80mA Peak
350mW
Single 12V
Line Impedance
Line Power
Peak-to-Average Ratio
Transformer Turns Ratio
Reflected Impedance
Back-Termination Resistors
Transformer Insertion Loss
Average Amplifier Swing
Average Amplifier Current
Peak Amplifier Swing
Peak Amplifier Current
Total Average Power Consumption
Supply Voltage
by the same amount as the reduction in the back-termina-
tion resistor. Taking into account the different transformer
turns ratios, the received signal of the low power design
will be one third of the standard design received signal.
The reduced signal has system implications for the sensi-
tivity of the receiver. The power reduction may, or may not,
be an acceptable system tradeoff for a given design.
Demo Board
Demo board DC304 has been created to provide a versatile
platform for a line driver/receiver design. (Figure 11 shows
a complete schematic.) The board is set up for either single
or dual supply designs with Jumpers 1–4. The LT1886 is
set up for differential, noninverting gain of 3. Each amp is
configured as in Figure 5 for maximum flexibility. The
amplifiers drive a 1:2 transformer through back-termina-
tion resistors that can be reduced with optional positive
feedback. The secondary of the transformer can be iso-
lated from the primary with Jumper 5.
A differential receiver is included using the LT1813, a dual
100MHz, 750V/
μ
s operational amplifier. The receiver gain
from the transformer secondary is 2, and the drive signals
are rejected by approximately a factor of 14dB. Other
optional components include filter capacitors and an RC
snubber network at the transformer primary.
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| LT1886CS8 | 功能描述:IC OPAMP DUAL 200MA 700MHZ 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:100 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:0.2 V/µs 增益帶寬積:- -3db帶寬:- 電流 - 輸入偏壓:100pA 電壓 - 輸入偏移:30µV 電流 - 電源:380µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):±2 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:管件 |
| LT1886CS8#PBF | 功能描述:IC OPAMP DUAL 200MA 700MHZ 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:100 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:0.2 V/µs 增益帶寬積:- -3db帶寬:- 電流 - 輸入偏壓:100pA 電壓 - 輸入偏移:30µV 電流 - 電源:380µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):±2 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:管件 |
| LT1886CS8#TR | 功能描述:IC OPAMP DUAL 200MA 700MHZ 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:100 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:0.2 V/µs 增益帶寬積:- -3db帶寬:- 電流 - 輸入偏壓:100pA 電壓 - 輸入偏移:30µV 電流 - 電源:380µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):±2 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:管件 |
| LT1886CS8#TRPBF | 功能描述:IC OPAMP DUAL 200MA 700MHZ 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:100 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:0.2 V/µs 增益帶寬積:- -3db帶寬:- 電流 - 輸入偏壓:100pA 電壓 - 輸入偏移:30µV 電流 - 電源:380µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):±2 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:管件 |
| LT1893-11-0125 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PHOTOTRANSISTOR | NPN | DOME-5.0 |
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