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LT6402-20 Datasheet

Low Noise Differential Amplifier/ADC Driver

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LT6402-20
FEATURES
300MHz Low Distortion, Low
Noise Differential Amplifier/ADC
Driver (AV = 20dB)
DESCRIPTIO
300 MHz –3dB Bandwidth
Fixed Gain of 20dB
Low Distortion:
48.5dBm OIP3, –81dBc HD3 (20MHz, 2VP-P)
Low Noise:
12.4dB NF, en = 1.9nV/√Hz (20MHz)
Differential Inputs and Outputs
Additional Filtered Outputs
Adjustable Output Common Mode Voltage
DC- or AC-Coupled Operation
Minimal Support Circuitry Required
Small 0.75mm Profile 16-Lead 3mm × 3mm QFN
Package
U
APPLICATIO S
Differential ADC Driver for:
Imaging
Communications
Differential Driver/Receiver
Single Ended to Differential Conversion
Differential to Single Ended Conversion
Level Shifting
IF Sampling Receivers
SAW Filter Interfacing/Buffering
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
The LT®6402-20 is a low distortion, low noise differential
amplifier/ADC driver for use in applications from DC to
300MHz. The LT6402-20 has been designed for ease of
use, with minimal support circuitry required. Exceptionally
low input-referred noise and low distortion (with either
single-ended or differential inputs) make the LT6402-20
an excellent solution for driving high speed 12-bit and
14-bit ADCs. In addition to the normal unfiltered outputs
(+OUT and –OUT), the LT6402-20 has a built-in 75MHz
differential low pass filter and an additional pair of filtered
outputs (+OUTFILTERED, –OUTFILTERED) to reduce
external filtering components when driving high speed
ADCs. The output common mode voltage is easily set via
the VOCM pin, eliminating an output transformer or AC-
coupling capacitors in many applications.
The LT6402-20 is designed to meet the demanding require-
ments of communications transceiver applications. It can
be used as a differential ADC driver, a general-purpose
differential gain block, or in other applications requiring
differential drive. The LT6402-20 can be used in data
acquisition systems required to function at frequencies
down to DC.
The LT6402-20 operates on a 5V supply and consumes 30mA.
It comes in a compact 16-lead 3mm × 3mm QFN package
and operates over a –40ºC to 85ºC temperature range.
TYPICAL APPLICATIO
0.1µF
IN
0.1µF
–INB
–INA
VOCM
+OUT
LT6402-20
–OUT
+INB
+INA
10
10
AIN+
VCM
LTC2249
AIN
6402 TA01a
Distortion vs Frequency, Differential
Input, No RLOAD
–10 UNFILTERED OUTPUTS
VOUT = 2VP-P
–30
–50
HD3
–70
HD2
–90
–110
–130
1
10
FREQUENCY (MHz)
100
64022 G04
640220f
1


Linear Technology Electronic Components Datasheet

LT6402-20 Datasheet

Low Noise Differential Amplifier/ADC Driver

No Preview Available !

www.DataSheet4U.com
LT6402-20
ABSOLUTE AXI U RATI GS
(Note 1)
Total Supply Voltage (VCCA/VCCB/VCCC to
VEEA/VEEB/VEEC) ...................................................5.5V
Input Current (+INA, –INA, +INB, –INB,
VOCM, ENABLE)................................................±10mA
Output Current (Continuous)
+OUT, –OUT...................................................±100mA
+OUTFILTERED, –OUTFILTERED......................±30mA
Output Short Circuit Duration (Note 2) ............ Indefinite
Operating Temperature Range (Note 3) ... –40°C to 85°C
Specified Temperature Range (Note 4) .... –40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
Junction Temperature ........................................... 125°C
Lead Temperature Range (Soldering 10 sec) ........ 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
16 15 14 13
VCCC 1
12 VEEC
VOCM 2 17 11 ENABLE
VCCA 3
10 VCCB
VEEA 4
9 VEEB
5678
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
TJMAX = 125°C, θJA = 68°C/W, θJC = 4.2°C/W
EXPOSED PAD IS VEE (PIN 17)
MUST BE SOLDERED TO THE PCB
ORDER PART NUMBER UD PART MARKING*
LT6402CUD-20
LT6402IUD-20
LCBC
LCBC
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
*The temperature grade is identified by a label on the shipping container.
DC ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCCA = VCCB = VCCC = 5V, VEEA = VEEB = VEEC = 0V, ENABLE = 0.8V, +INA
shorted to +INB (+IN), –INA shorted to –INB (–IN), VOCM = 2.2V, Input common mode voltage = 2.2V, no RLOAD unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input/Output Characteristics (+INA, +INB, –INA, –INB, +OUT, –OUT, +OUTFILTERED, –OUTFILTERED)
GDIFF
Gain
Differential (+OUT, –OUT), VIN = ±160mV
Differential
18.9 20 20.9
dB
VSWINGMIN
VSWINGMAX
VSWINGDIFF
IOUT
Output Voltage Swing
Output Current Drive
Single-Ended +OUT, –OUT, +OUTFILTERED,
–OUTFILTERED, VIN = ±600mV Differential
Single-Ended +OUT, –OUT, +OUTFILTERED,
–OUTFILTERED, VIN = ±600mV Differential
Differential (+OUT, –OUT), VIN = ±600mV
Differential
0.25 0.35
0.5
3.4
3.3
3.6
6.1
5.6
7
±30
±35
V
V
V
V
VP-P
VP-P
mA
VOS Input Offset Voltage
–6.5
–10
1
6.5
10
mV
mV
TCVOS
Input Offset Voltage Drift
TMIN to TMAX
2.5
µV/°C
640220f
2


Part Number LT6402-20
Description Low Noise Differential Amplifier/ADC Driver
Maker Linear Technology
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