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參數(shù)資料
| 型號： | LT6402IUD-20#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DIFF AMP/ADC DRVR 16-QFN |
| 標準包裝： | 121 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 2 |
| 輸出類型： | 差分 |
| 轉(zhuǎn)換速率： | 400 V/µs |
| -3db帶寬： | 300MHz |
| 電流 - 輸入偏壓： | 5µA |
| 電壓 - 輸入偏移： | 1000µV |
| 電流 - 電源： | 30mA |
| 電流 - 輸出 / 通道： | 35mA |
| 電壓 - 電源，單路/雙路(±)： | 4 V ~ 5.5 V，±2 V ~ 2.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WFQFN 裸露焊盤 |
| 供應商設(shè)備封裝： | 16-QFN-EP（3x3） |
| 包裝： | 管件 |
LT6402-20
10
640220fa
APPLICATIO S I FOR ATIO
WU
U
Circuit Description
The LT6402-20 is a low noise, low distortion differential
amplier/ADC driver with:
–3dB bandwidth
DC to 300MHz
Fixed gain independent of RLOAD
10V/V (20dB)
Differential input impedance
100Ω
Low output impedance
Built-in, user adjustable output ltering
Requires minimal support circuitry
Referring to the block diagram, the LT6402-20 uses a
closed-loop topology which incorporates 3 internal am-
pliers. Two of the ampliers (A and B) are identical and
drive the differential outputs. The third amplier is used
to set the output common mode voltage. Gain and input
impedance are set by the 500Ω and 100Ω resistors in
the internal feedback network. Output impedance is low,
determined by the inherent output impedance of ampliers
A and B, and further reduced by internal feedback.
The LT6402-20 also includes built-in single-pole output
ltering. The user has the choice of using the unltered
outputs, the ltered outputs (75MHz –3dB lowpass), or
modifying the ltered outputs to alter frequency response
by adding additional components. Many lowpass and
bandpass lters are easily implemented with just one or
two additional components.
The LT6402-20 has been designed to minimize the need
for external support components such as transformers or
AC-coupling capacitors. As an ADC driver, the LT6402-20
requires no external components except for power-supply
bypass capacitors. This allows DC-coupled operation for
applications that have frequency ranges including DC. At
the outputs, the common mode voltage is set via the VOCM
pin, allowing the LT6402-20 to drive ADCs directly. No
output AC-coupling capacitors or transformers are needed.
At the inputs, signals can be differential or single-ended
with virtually no difference in performance. Furthermore,
DC levels at the inputs can be set independently of the
output common mode voltage. These input characteristics
often eliminate the need for an input transformer and/or
AC-coupling capacitors.
Input Impedance and Matching Networks
Calculation of the input impedance of the LT6402-20 is
not straightforward from examination of the block diagram
because of the internal feedback network. In addition, the
input impedance when driven differentially is different than
when driven single-ended.
Differential
Single-Ended
LT6402-20
100Ω
85.9Ω
For single-ended 50Ω applications, a 121Ω shunt matching
resistor to ground will result in the proper input termina-
tion (Figure 1). For differential inputs there are several
termination options. If the input source is 50Ω differential,
then the input matching can be accomplished by either
a 100Ω shunt resistor across the inputs (Figure 3), or
equivalent 49.9Ω shunt resistors on each of the inputs
to ground (Figure 2). If additional AC gain is desired, an
impedance ratio transformer can also be used to better
match impedances.
6402 F01
IF IN
0.1
F
LT6402-20
–INA
–INB
–OUT
+OUT
8
5
+INB
+INA
14
13
15
121
ZIN = 50
SINGLE-ENDED
16
Figure 1. Input Termination for Single-Ended 50Ω
Input Impedance
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| LT6402IUD-6 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:300MHz Low Distortion, Low Noise Differential Amplifi er/ ADC Driver (AV = 6dB) |
| LT6402IUD-6#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:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉(zhuǎn)換速率:350 V/µs 增益帶寬積:180MHz -3db帶寬:320MHz 電流 - 輸入偏壓:12.5µA 電壓 - 輸入偏移:800µV 電流 - 電源:15mA 電流 - 輸出 / 通道:85mA 電壓 - 電源，單路/雙路(±):2.5 V ~ 12.6 V，±1.25 V ~ 6.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設(shè)備封裝:8-MSOP 包裝:帶卷 (TR) |
| LT6402IUD-6#TRPBF | 功能描述:IC DIFF AMP/ADC DVR 6DB 16-QFN RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
| LT6402IUD-6-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:300MHz Low Distortion, Low Noise Differential Amplifi er/ ADC Driver (AV = 6dB) |
| LT6402IUD-6-TR | 制造商:LINER 制造商全稱:Linear Technology 功能描述:300MHz Low Distortion, Low Noise Differential Amplifi er/ ADC Driver (AV = 6dB) |
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