LTC6406_15 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, LTM, Linear Technology and the Linear logo 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
6406fc
1