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LT6402CUD-12-TRPBF Datasheet(PDF) 10 Page - Linear Technology

Part # LT6402CUD-12-TRPBF
Description  300MHz Low Distortion, Low Noise Differential Amplifi er/ ADC Driver (AV = 12dB)
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT6402CUD-12-TRPBF Datasheet(HTML) 10 Page - Linear Technology

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LT6402-12
10
640212fa
Circuit Description
The LT6402-12 is a low noise, low distortion differential
amplifier/ADC driver with:
• –3dB bandwidth
DC to 300MHz
• Fixed gain independent of RLOAD
4V/V (12dB)
• Differential input impedance
100Ω
• Low output impedance
• Built-in, user adjustable output filtering
• Requires minimal support circuitry
Referring to the block diagram, the LT6402-12 uses a
closed-loop topology which incorporates 3 internal am-
plifiers. Two of the amplifiers (A and B) are identical and
drive the differential outputs. The third amplifier is used
to set the output common mode voltage. Gain and input
impedance are set by the 200Ω resistors in the internal
feedback network. Output impedance is low, determined
by the inherent output impedance of amplifiers A and B,
and further reduced by internal feedback.
The LT6402-12 also includes built-in single-pole output
filtering. The user has the choice of using the unfiltered
outputs, the filtered outputs (75MHz –3dB lowpass), or
modifying the filtered outputs to alter frequency response
by adding additional components. Many lowpass and
bandpass filters are easily implemented with just one or
two additional components.
BLOCK DIAGRAM
+
–
14
–INA
5
+OUT
64026 BD
3
VCCA
10
VCCB
1
VCCC
11
ENABLE
13
–INB
14pF
VCCA
A
VEEA
VEEA
50Ω
6
+OUTFILTERED
–
+
16
+INA
8
–OUT
15
+INB
VCCB
B
VEEB
VEEB
100Ω
100Ω
100Ω
100Ω
200Ω
200Ω
200Ω
200Ω
50Ω
14pF
14pF
7
–OUTFILTERED
12
VEEC
9
VEEB
4
VEEA
+
–
VEEC
C
VCCC
2
VOCM
BIAS
APPLICATIONS INFORMATION


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