LT6402-12_15 Datasheet, PDF (1/16 Pages) Linear Technology – 300MHz Low Distortion, Low Noise Differential Amplifier

FEATURES
n _{300 MHz –3dB Bandwidth}
n _{Fixed Gain of 12dB}
n _{Low Distortion:}
43dBm OIP3, –82dBc HD3 (20MHz, 2V_P-P)
n _{Low Noise:}
15dB NF, e_n = 2.6nV/√Hz (20MHz)
n _{Differential Inputs and Outputs}
n _{Additional Filtered Outputs}
n _{Adjustable Output Common Mode Voltage}
n _{DC- or AC-Coupled Operation}
n _{Minimal Support Circuitry Required}
n _{Small 0.75mm Profile 16-Lead 3mm × 3mm QFN}
Package
APPLICATIONS
n _{Differential ADC Driver for:}
Imaging
Communications
n _{Differential Driver/Receiver}
n _{Single Ended to Differential Conversion}
n _{Differential to Single Ended Conversion}
n _{Level Shifting}
n _{IF Sampling Receivers}
n _{SAW Filter Interfacing/Buffering}
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
0.1μF
0.1μF
0.1μF
IF IN
5V
0.1μF
–INB
V_CC
–INA
V_OCM
10Ω
+OUT
LT6402-12
10Ω
–OUT
+INB
+INA ^VEE
V_CM
AIN⁺
LTC^®2249
AIN^–
64026 TA01a
LT6402-12
300MHz Low Distortion, Low
Noise Differential Amplifier/
ADC Driver (A_V = 12dB)
DESCRIPTION
The LT^®6402-12 is a low distortion, low noise differential
amplifier/ADC driver for use in applications from DC to
300MHz. The LT6402-12 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 LT6402-12
an excellent solution for driving high speed 12-bit and
14-bit ADCs. In addition to the normal unfiltered outputs
(+OUT and –OUT), the LT6402-12 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 LT6402-12 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 LT6402-12 can be used in data
acquisition systems required to function at frequencies
down to DC.
The LT6402-12 operates on a 5V supply and consumes 30mA.
It comes in a compact 16-lead 3mm × 3mm QFN package
and operates over a –40°C to 85°C temperature range.
Distortion vs Frequency, Differential Input, No R_LOAD
–40
FILTERED OUTPUTS
V_OUT = 2V_P-P
–50
–60
–70
–80
–90
–100
1
HD3
HD2
10
FREQUENCY (MHz)
100
640212 TA01b
640212fa
1