LTC6406 Datasheet, PDF (1/24 Pages) Linear Technology – 3GHz, Low Noise, Rail-to-Rail Input Differential Amplifi er/Driver

FEATURES
n _{Low Noise: 1.6nV/√Hz RTI}
n _{Low Power: 18mA at 3V}
n _{Low Distortion (HD2/HD3):}
–80dBc/–69dBc at 50MHz, 2V_P-P
–104dBc/–90dBc at 20MHz, 2V_P-P
n _{Rail-to-Rail Differential Input}
n _{2.7V to 3.5V Supply Voltage Range}
n _{Fully Differential Input and Output}
n _{Adjustable Output Common Mode Voltage}
n _{800MHz –3dB Bandwidth with AV = 1}
n _{Gain-Bandwidth Product: 3GHz}
n _{Low Power Shutdown}
n _{Available in 8-Lead MSOP and Tiny 16-Lead}
3mm × 3mm × 0.75mm QFN Packages
APPLICATIONS
n _{Differential Input ADC Driver}
n _{Single-Ended to Differential Conversion}
n _{Level-Shifting Ground-Referenced Signals}
n _{Level-Shifting VCC-Referenced Signals}
n _{High Linearity Direct Conversion Receivers}
LTC6406
3GHz, Low Noise,
Rail-to-Rail Input Differential
Amplifier/Driver
DESCRIPTION
The LTC^®6406 is a very low noise, low distortion, fully
differential input/output amplifier optimized for 3V, single
supply operation. The LTC6406 input common mode range
is rail-to-rail, while the output common mode voltage is
independently adjustable by applying a voltage on the
V_OCM pin. This makes the LTC6406 ideal for level-shifting
signals with a wide common mode range for driving 12-bit
to 16-bit single supply, differential input ADCs.
A 3GHz gain-bandwidth product results in 70dB linearity for
50MHz input signals. The LTC6406 is unity-gain stable and
the closed-loop bandwidth extends from DC to 800MHz.
The output voltage swing extends from near ground to
2V, to be compatible with a wide range of ADC converter
input requirements. The LTC6406 draws only 18mA, and
has a hardware shutdown feature which reduces current
consumption to 300μA.
The LTC6406 is available in a compact 3mm × 3mm 16-pin
leadless QFN package as well as an 8-lead MSOP package,
and operates over a –40°C to 85°C temperature range.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
ADC Driver: Single-Ended Input to Differential Output with
Common Mode Level Shifting
1.8pF
V_{IN 150Ω}
V_OCM
1.25V
150Ω
3V
–+
LTC6406
+–
3V
V_DD
+INA
LTC22xx ADC
–INA
GND
150Ω
150Ω
1.8pF
6406 TA01
Harmonic Distortion vs Frequency
–30
V_S = 3V
–40
V_OCM = V_ICM = 1.25V
R_LOAD = 800Ω
–50
V_OUTDIFF = 2V_P-P
DIFFERENTIAL INPUTS
–60
2ND, R_I = R_F = 150Ω
–70
2ND, R_I = R_F = 500Ω
3RD, R_I = R_F = 150Ω
–80
3RD, R_I = R_F = 500Ω
–90
–100
–110
1
10
FREQUENCY (MHz)
100
6406 TA01b
6406fb
1