LTC6400-20
1.8GHz Low Noise, Low
Distortion Differential ADC
Driver for 300MHz IF
FEATURES DESCRIPTION
1.8GHz 3dB Bandwidth
The LTC 6400-20 is a high-speed differential ampli er
Fixed Gain of 10V/V (20dB)
targeted at processing signals from DC to 300MHz. The
94dBc IMD at 70MHz (Equivalent OIP3 = 51dBm)
part has been speci cally designed to drive 12-, 14- and
3
65dBc IMD at 300MHz (Equivalent OIP3 = 36.5dBm)
16-bit ADCs with low noise and low distortion, but can also
3
1nV/Hz Internal Op Amp Noise
be used as a general-purpose broadband gain block.
2.1nV/Hz Total Input Noise
The LTC6400-20 is easy to use, with minimal support
6.2dB Noise Figure
circuitry required. The output common mode voltage is
Differential Inputs and Outputs
set using an external pin, independent of the inputs, which
200 Input Impedance
eliminates the need for transformers or AC-coupling ca-
2.85V to 3.5V Supply Voltage
pacitors in many applications. The gain is internally xed
90mA Supply Current (270mW)
at 20dB (10V/V).
1V to 1.6V Output Common Mode Voltage,
The LTC6400-20 saves space and power compared to
Adjustable
alternative solutions using IF gain blocks and transform-
DC- or AC-Coupled Operation
ers. The LTC6400-20 is packaged in a compact 16-lead
Max Differential Output Swing 4.4V
P-P
3mm 3mm QFN package and operates over the 40C
Small 16-Lead 3mm 3mm 0.75mm QFN Package
to 85C temperature range.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
APPLICATIONS
All other trademarks are the property of their respective owners.
Differential ADC Driver
Differential Driver/Receiver
Single Ended to Differential Conversion
IF Sampling Receivers
SAW Filter Interfacing
TYPICAL APPLICATION
Equivalent Output IP3 vs
Single-Ended to Differential ADC Driver Frequency
60
3.3V (NOTE 7)
1.25V
50
0.1F 1000pF 0.1F
40
+
V
0.1F
V 30
OCM
10
V V
CM DD
+
INPUT +IN
+OUT AIN
+OUTF 20
66.5
LTC6400-20 LTC2208
0.1F
OUTF
OUT AIN
10
IN
V 10
29
ENABLE
LTC2208 130Msps
0
16-Bit ADC
20dB GAIN 050 100 150 200 250 300
FREQUENCY (MHz)
640020 TA01a
640020 TA01b
640020f
1
OUTPUT IP3 (dBm)LTC6400-20
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
Lead Temperature (Soldering, 10 sec) .................. 300C
UD PACKAGE
16-LEAD (3mm 3mm) PLASTIC QFN
T = 125C, = 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 TEMPERATURE RANGE
LTC6400CUD-20#PBF LTC6400CUD-20#TRPBF LCCS 16-Lead (3mm 3mm) Plastic QFN 0C to 70C
LTC6400IUD-20#PBF LTC6400IUD-20#TRPBF LCCS 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: