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參數(shù)資料
| 型號： | LT1993-2 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF |
| 中文描述： | 1.3GHz的低噪聲，低失真差分ADC驅(qū)動器為140MHz的中頻 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 232K |
| 代理商： | LT1993-2 |
LTC6401-20
10
640120f
APPLICATIONS INFORMATION
Circuit Operation
The LTC6401-20 is a low noise and low distortion fully
differential op amp/ADC driver with:
Operation from DC to 1.3GHz –3dB bandwidth
impedance
Fixed gain of 10V/V (20dB)
Differential input impedance 200
Ω
Differential output impedance 25
Ω
Differential impedance of output filter 100
Ω
The LTC6401-20 is composed of a fully differential amplifier
with on chip feedback and output common mode voltage
control circuitry. Differential gain and input impedance are
set by 100
Ω
/1000
Ω
resistors in the feedback network.
Small output resistors of 12.5
Ω
improve the circuit stability
over various load conditions. They also provide a possible
external filtering option, which is often desirable when the
load is an ADC.
Filter resistors of 50
Ω
are available for additional filtering.
Lowpass/bandpass filters are easily implemented with just
a couple of external components. Moreover, they offer
single-ended 50
Ω
matching in wideband applications and
no external resistor is needed.
The LTC6401-20 is very flexible in terms of I/O coupling.
It can be AC- or DC-coupled at the inputs, the outputs or
both. Due to the internal connection between input and
output, users are advised to keep input common mode
voltage between 1V and 1.6V for proper operation. If the
inputs are AC-coupled, the input common mode voltage
is automatically biased close to V
OCM
and thus no external
circuitry is needed for bias. The LTC6401-20 provides an
output common mode voltage set by V
OCM
, which allows
driving an ADC directly without external components such
as a transformer or AC coupling capacitors. The input
signal can be either single-ended or differential with only
minor differences in distortion performance.
Input Impedance and Matching
The differential input impedance of the LTC6401-20 is
200
Ω
. If a 200
Ω
source impedance is unavailable, then
the differential inputs may need to be terminated to a lower
value impedance, e.g. 50
Ω
, in order to provide an imped-
ance match to the source. Several choices are available.
One approach is to use a differential shunt resistor (Figure
1). Another approach is to employ a wideband transformer
(Figure 2). Both methods provide a wideband match. The
termination resistor or the transformer must be placed
close to the input pins in order to minimize the reflection
due to input mismatch. Alternatively, one could apply a
narrowband impedance match at the inputs of the LTC6401-
20 for frequency selection and/or noise reduction.
Referring to Figure 3, LTC6401-20 can be easily configured
for single-ended input and differential output without a
balun. The signal is fed to one of the inputs through a
matching network while the other input is connected to
the same matching network and a source resistor. Because
the return ratios of the two feedback paths are equal, the
Figure 1. Input Termination for Differential 50
Ω
Input Impedance
Using Shunt Resistor
Figure 2. Input Termination for Differential 50
Ω
Input Impedance
Using a 1:4 Balun
640120 F01
IN+
OUT–
IN–
OUT+
100
Ω
66.5
Ω
12.5
Ω
1000
Ω
LTC6401-20
100
Ω
25
Ω
25
Ω
V
IN
1000
Ω
12.5
Ω
50
Ω
50
Ω
13
14
15
16
7
5
6
8
+
+OUT
+OUTF
–OUTF
–OUT
+IN
+IN
–IN
–IN
1.7pF
640120 F02
IN+
OUT–
IN–
OUT+
100
Ω
12.5
Ω
1000
Ω
LTC6401-20
100
Ω
25
Ω
25
Ω
V
IN
1000
Ω
12.5
Ω
50
Ω
50
Ω
13
14
15
16
7
5
6
8
+
1:4
+OUT
+OUTF
–OUTF
–OUT
+IN
+IN
–IN
–IN
1.7pF
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1993-4 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF |
| LT1993CUD-10 | 制造商:Linear Technology 功能描述:SP Amp DIFF AMP Single 5.5V 16-Pin QFN EP 制造商:Linear Technology 功能描述:DIFF-AMPLIFIER, 700MHZ, 1.1KV/US, QFN-16, No. of Amplifiers:2, Input Offset Voltage:1mV, Gain dB Max:20.9dB, Bandwidth:700MHz, Amplifier Case Style:QFN, No. of Pins:16, Supply Voltage Range:4V to 5.5V, Slew Rate:1.1kV/s, MSL:- 制造商:Linear Technology 功能描述:OP-AMP, 10000 uV OFFSET-MAX, PQCC16 |
| LT1993CUD-10#PBF | 功能描述:IC DIFF AMP/ADC DRVR 16-QFN RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| LT1993CUD-10#TR | 制造商:Linear Technology 功能描述:DIFF-AMPLIFIER, 700MHZ, 1.1KV/US, QFN-16, No. of Amplifiers:2, Input Offset Voltage:1mV, Gain dB Max:20.9dB, Bandwidth:700MHz, Amplifier Case Style:QFN, No. of Pins:16, Supply Voltage Range:4V to 5.5V, Slew Rate:1.1kV/s, MSL:- |
| LT1993CUD-10#TRPBF | 功能描述:IC DIFF AMP/ADC DRVR 16-QFN RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
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