LTC6405_15 Datasheet, PDF (1/26 Pages) Linear Technology – 2.7GHz, 5V, Low Noise, Rail-to-Rail Input Differential Amplifier/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 5.25V 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, 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
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
For more information www.linear.com/6405
6405fb
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