鈻?/div>
DESCRIPTION
The LTC
廬
6401-20 is a high-speed differential ampli鏗乪r
targeted at processing signals from DC to 140MHz. The
part has been speci鏗乧ally designed to drive 12-, 14- and
16-bit ADCs with low noise and low distortion, but can also
be used as a general-purpose broadband gain block.
The LTC6401-20 is easy to use, with minimal support
circuitry required. The output common mode voltage is
set using an external pin, independent of the inputs, which
eliminates the need for transformers or AC-coupling ca-
pacitors in many applications. The gain is internally 鏗亁ed
at 20dB (10V/V).
The LTC6401-20 saves space and power compared to
alternative solutions using IF gain blocks and transform-
ers. The LTC6401-20 is packaged in a compact 16-lead
3mm
脳
3mm QFN package and operates over the 鈥?0擄C
to 85擄C temperature range.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
鈻?/div>
鈻?/div>
鈻?/div>
1.3GHz 鈥?dB Bandwidth
Fixed Gain of 10V/V (20dB)
鈥?3dBc IMD
3
at 70MHz (Equivalent OIP
3
= 50.5dBm)
鈥?4dBc IMD
3
at 140MHz (Equivalent OIP
3
= 41dBm)
1nV/鈭?/div>
鈳?/div>
H
鈳?/div>
z Internal Op Amp Noise
2.1nV/鈭?/div>
鈳?/div>
H
鈳?/div>
z Total Input Noise
6.2dB Noise Figure
Differential Inputs and Outputs
200惟 Input Impedance
2.85V to 3.5V Supply Voltage
50mA Supply Current (150mW)
1V to 1.6V Output Common Mode Voltage,
Adjustable
DC- or AC-Coupled Operation
Max Differential Output Swing 4.4V
P-P
Small 16-Lead 3mm
脳
3mm
脳
0.75mm QFN Package
APPLICATIONS
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
Differential ADC Driver
Differential Driver/Receiver
Single Ended to Differential Conversion
IF Sampling Receivers
SAW Filter Interfacing
TYPICAL APPLICATION
Single-Ended to Differential ADC Driver
3.3V
0.1渭F + 1000pF
V
+
0.1渭F
INPUT
66.5惟
0.1渭F
+IN
V
OCM
+OUT
+OUTF
LTC6401-20
鈥揙UTF
鈥揙UT
鈥揑N
V鈥?/div>
ENABLE
20dB GAIN
10惟
AIN
+
V
CM
LTC2208
AIN
鈥?/div>
10惟
LTC2208 130Msps
16-Bit ADC
640120 TA01a
Equivalent Output IP3 vs Frequency
70
60
3.3V
OUTPUT IP3 (dBm)
50
40
30
20
10
0
0
50
100
150
FREQUENCY (MHz)
200
640120 TA01b
1.25V
0.1渭F
(NOTE 7)
V
DD
29惟
640120f
1
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