LTC6401-26
1
640126f
FREQUENCY (MHz)
0
0
OUTPUT IP3 (dBm)
10
20
30
40
50
60
50 100 150 200
640126 TA01b
NO R
L
R
L
= 200Ω
DIFFERENTIAL INPUT
(NOTE 7)
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
1.6GHz Low Noise,
Low Distortion Differential
ADC Driver for DC-140MHz
The LTC
®
6401-26 is a high-speed differential amplifi er
targeted at processing signals from DC to 140MHz. The
part has been specifi cally 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 LTC6401-26 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 of transformers or AC-coupling ca-
pacitors in many applications. The gain is internally fi xed
at 26dB (20V/V).
The LTC6401-26 saves space and power compared to
alternative solutions using IF gain blocks and transform-
ers. The LTC6401-26 is packaged in a compact 16-lead
3mm × 3mm QFN package and operates over the –40°C
to 85°C temperature range.
Equivalent OIP3 vs Frequency
■
1.6GHz –3dB Bandwidth
■
Fixed Gain of 20V/V (26dB)
■
–85dBc IMD3 at 70MHz (Equivalent OIP3 = 46.5dBm)
■
–72dBc IMD3 at 140MHz (Equivalent OIP3 = 40dBm)
■
1nV/√
⎯
H
⎯
z Internal Op Amp Noise
■
1.5nV/√
⎯
H
⎯
z Total Input Referred Noise
■
6.8dB Noise Figure
■
Differential Inputs and Outputs
■
50Ω Input Impedance
■
2.85V to 3.5V Supply Voltage
■
45mA Supply Current (135mW)
■
1V to 1.6V Output Common Mode, Adjustable
■
DC- or AC-Coupled Operation
■
Max Differential Output Swing 4.7V
P-P
■
Small 16-Lead 3mm × 3mm × 0.75mm QFN Package
■
Differential ADC Driver
■
Differential Driver/Receiver
■
Single Ended to Differential Conversion
■
IF Sampling Receivers
■
SAW Filter Interfacing
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Single-Ended to Differential ADC Driver at 140MHz IF
37.4Ω
150Ω
0.1μF
0.1μF
640126 TA01a
LTC6401-26
LTC2208
LTC2208
130Msps
16-BIT ADC
15Ω
0.1μF
V
IN
1000pF
3.3V3.3V
15Ω
10Ω
10Ω
100Ω
V
OCM
0.1μF
1.25V
33pF
COILCRAFT
0603CS
33pF
L1
24nH
33pF
V
+
–IN
V
OCM
+IN
+OUT
–OUT
V
–
AIN
+
AIN
–
V
CM
V
DD
LTC6401-26