LTC6405 Datasheet, PDF (1/24 Pages) Linear Technology – 2.7GHz, 5V, Low Noise, Rail-to-Rail Input Differential Amplifi er/Driver

FEATURES
n _{Low Noise: 1.6nV/√Hz RTI}
n _{Low Power: 18mA at 5V}
n _{Low Distortion (HD2/HD3):}
–82dBc/–65dBc at 50MHz, 2V_P-P
–97dBc/–91dBc at 25MHz, 2V_P-P
n _{Rail-to-Rail Differential Input}
n _{4.5V to 5.5V 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: 2.7GHz}
n _{Low Power Shutdown}
n _{Available in 8-Lead MSOP and 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}
LTC6405
2.7GHz, 5V, Low Noise,
Rail-to-Rail Input Differential
Amplifier/Driver
DESCRIPTION
The LTC^®6405 is a very low noise, low distortion, fully
differential input/output amplifier optimized for 5V, single
supply operation. The LTC6405 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 LTC6405 ideal for level shifting
signals with a wide common mode range for driving 12-bit
to 16-bit single supply, differential input ADCs.
A 2.7GHz gain-bandwidth product results in 65dB linearity
for 50MHz input signals. The LTC6405 is unity gain stable
and the closed-loop bandwidth extends from DC to 800MHz.
The output voltage swing extends from near-ground to
4V, to be compatible with a wide range of ADC converter
input requirements. The LTC6405 draws only 18mA, and
has a hardware shutdown feature which reduces current
consumption to 400μA.
The LTC6405 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
Single-Ended Input to Differential Output
with Common Mode Level Shifting
2V_P-P
0V
V_{S 50Ω}
196Ω
1.8pF
200Ω
SIGNAL
GENERATOR
61.9Ω
5V _0.1μF
+
V_OCM
LTC6405UD
0.01μF
–
221Ω
1.8pF
200Ω
1V_P-P
2.5V
2.5V
1V_P-P
6405 TA01
Input Noise Density vs Input
Common Mode Voltage
4
4
V_S = 5V
NOISE MEASURED AT f = 1MHz
3
3
i_n
2
2
e_n
1
1
0
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
INPUT COMMON MODE VOLTAGE (V)
6405 TA01b
6405fa
1