LTC6401-8
2.2GHz Low Noise, Low
Distortion Differential ADC
Driver for DC-140MHz
FEATURES DESCRIPTION
2.2GHz 3dB Bandwidth
The LTC 6401-8 is a high-speed differential ampli er tar-
Fixed Gain of 2.5V/V (8dB)
geted at processing signals from DC to 140MHz. The part
92dBc IMD3 at 70MHz (Equivalent OIP3 = 50dBm)
has been speci cally designed to drive 12-, 14- and 16-bit
80.5dBc IMD3 at 140MHz (Equivalent OIP3 = 44dBm)
ADCs with low noise and low distortion, but can also be
1nV/Hz Internal Op Amp Noise
used as a general-purpose broadband gain block.
12.1dB Noise Figure
The LTC6401-8 is easy to use, with minimal support cir-
Differential Inputs and Outputs
cuitry required. The output common mode voltage is set
400 Input Impedance
using an external pin, independent of the inputs, which
2.85V to 3.5V Supply Voltage
eliminates the need for transformers or AC-coupling ca-
45mA Supply Current (135mW)
pacitors in many applications. The gain is internally xed
1V to 1.6V Output Common Mode, Adjustable
at 8dB (2.5V/V).
DC- or AC-Coupled Operation
The LTC6401-8 saves space and power compared to al-
Max Differential Output Swing 4.6V
P-P
ternative solutions using IF gain blocks and transformers.
Small 16-Lead 3mm 3mm 0.75mm QFN Package
The LTC6401-8 is packaged in a compact 16-lead 3mm
3mm QFN package and operates over the 40C to 85C
APPLICATIONS
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
3.3V 3.3V
Equivalent Output IP3 vs Frequency
60
(NOTE 7)
C2
C1 C
F2
0.1F
1000pF 33pF
50
+
V
C3
R R
S1 S3
0.1F 40
15 10
V
+ DD
+OUT AIN
V +IN
IN
30
R1
C4 L1 C
F1
LTC6401-8 LTC2208
59.0
R R
0.1F S2 24nH 33pF S4
15 10
20
IN
OUT
AIN
V
V CM
OCM
R2 C
F3
COILCRAFT
27.4 V 33pF LTC2208
10
0603CS
130Msps
1.25V 16-Bit ADC
64018 TA01a 0
0 20 40 60 80 100 120 140 160 180 200
C5 R3
0.1F 100
FREQUENCY (MHz)
64018 TA01b
64018f
1
OUTPUT IP3 (dBm)LTC6401-8
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION
(Note 1)
TOP VIEW
Supply Voltage (V V ) ......................................3.6V
CC EE
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-8#PBF LTC6401CUD-8#TRPBF LCCY 16-Lead (3mm 3mm) Plastic QFN 0C to 70C
LTC6401IUD-8#PBF LTC6401IUD-8#TRPBF LCCY 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: