LTC6401-26
1.6GHz Low Noise,
Low Distortion Differential
ADC Driver for DC-140MHz
FEATURES DESCRIPTION
1.6GHz 3dB Bandwidth
The LTC 6401-26 is a high-speed differential ampli er
Fixed Gain of 20V/V (26dB)
targeted at processing signals from DC to 140MHz. The
85dBc IMD3 at 70MHz (Equivalent OIP3 = 46.5dBm)
part has been speci cally designed to drive 12-, 14- and
72dBc IMD3 at 140MHz (Equivalent OIP3 = 40dBm)
16-bit ADCs with low noise and low distortion, but can also
1nV/Hz Internal Op Amp Noise
be used as a general-purpose broadband gain block.
1.5nV/Hz Total Input Referred Noise
The LTC6401-26 is easy to use, with minimal support
6.8dB Noise Figure
circuitry required. The output common mode voltage is
Differential Inputs and Outputs
set using an external pin, independent of the inputs, which
50 Input Impedance
eliminates the need of transformers or AC-coupling ca-
2.85V to 3.5V Supply Voltage
pacitors in many applications. The gain is internally xed
45mA Supply Current (135mW)
at 26dB (20V/V).
1V to 1.6V Output Common Mode, Adjustable
The LTC6401-26 saves space and power compared to
DC- or AC-Coupled Operation
alternative solutions using IF gain blocks and transform-
Max Differential Output Swing 4.7V
P-P
ers. The LTC6401-26 is packaged in a compact 16-lead
Small 16-Lead 3mm 3mm 0.75mm QFN Package
3mm 3mm QFN package and operates over the 40C
APPLICATIONS
to 85C temperature range.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Differential ADC Driver
All other trademarks are the property of their respective owners.
Differential Driver/Receiver
Single Ended to Differential Conversion
IF Sampling Receivers
SAW Filter Interfacing
TYPICAL APPLICATION
Equivalent OIP3 vs Frequency
Single-Ended to Differential ADC Driver at 140MHz IF
60
3.3V 3.3V
DIFFERENTIAL INPUT
(NOTE 7)
50
0.1F 1000pF 33pF
40
+
V
0.1F
15 10
30
V
+ DD
+OUT AIN
V +IN
IN
L1
150 20
LTC6401-26LTC6401-26 33pF LTC2208
0.1F
24nH
15 10
IN OUT
10
AIN
V V
CM
OCM
V
OCM NO R
L
37.4
33pF
COILCRAFT R = 200
LTC2208
L
V
0
0603CS
130Msps
0 50 100 150 200
16-BIT ADC
1.25V
640126 TA01a FREQUENCY (MHz)
100
640126 TA01b
0.1F
640126f
1
OUTPUT IP3 (dBm)LTC6401-26
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION
(Note 1)
TOP VIEW
+
Supply Voltage (V V ) .......................................... 3.6V
Input Current (Note 2) ..........................................10mA
16 15 14 13
Operating Temperature Range
+
V 1 12 V
(Note 3) ............................................... 40C to 85C
V 2 11 ENABLE
OCM
17
+ +
Speci ed Temperature Range V 3 10 V
V 4 9 V
(Note 4) ............................................... 40C to 85C
5 6 7 8
Storage Temperature Range ................... 65C to 150C
Maximum Junction Temperature .......................... 150C
UD PACKAGE
16-LEAD (3mm 3mm) PLASTIC QFN
T = 150C, = 68C/W, = 4.2C/W
JMAX JA JC
EXPOSED PAD (PIN 17) IS V , MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LTC6401CUD-26#PBF LTC6401CUD-26#TRPBF LCDG 16-Lead (3mm 3mm) Plastic QFN 0C to 70C
LTC6401IUD-26#PBF LTC6401IUD-26#TRPBF LCDG 16-Lead (3mm 3mm) Plastic QFN 40C to 85C
Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based nish parts.
For more information on lead free part marking, go to: