LT6402-20_15 Datasheet, PDF (1/16 Pages) Linear Technology – 300MHz Low Distortion, Low Noise Differential Amplifier

FEATURES
■ _{300 MHz –3dB Bandwidth}
■ _{Fixed Gain of 20dB}
■ _{Low Distortion:}
51dBm OIP3, –81dBc HD3 (20MHz, 2V_P-P)
■ _{Low Noise:}
12.4dB NF, e_n = 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}
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LT6402-20
300MHz Low Distortion, Low
Noise Differential Amplifier/
ADC Driver (A_V = 20dB)
DESCRIPTIO
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 V_OCM 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 pack-
age and operates over a –40°C to 85°C temperature range.
TYPICAL APPLICATIO
0.1µF
0.1µF
0.1µF
IF IN
5V
0.1µF
–INB
V_CC
–INA
V_OCM
10Ω
+OUT
LT6402-20
10Ω
–OUT
+INB
V_EE
+INA
V_CM
AIN⁺
LTC^®2249
AIN^–
6402 TA01a
Distortion vs Frequency, Differential
Input, No R_LOAD
–40 _{FILTERED OUTPUTS}
V_OUT = 2V_P-P
–50
–60
–70
–80
HD3
–90
–100
1
HD2
10
FREQUENCY (MHz)
100
64022 G08
640220fa
1