LTC6404_15 Datasheet, PDF (1/28 Pages) Linear Technology – 600MHz, Low Noise, High Precision Fully Differential Input/Output Amplifi er/Driver

LTC6404
600MHz, Low Noise,
High Precision Fully Differential
Input/Output Amplifier/Driver
FEATURES
n _{Fully Differential Input and Output}
n _{Low Noise: 1.5nV/√Hz RTI}
n _{Very Low Distortion:}
LTC6404-1 (2V_P-P, 10MHz): –91dBc
LTC6404-2 (2V_P-P, 10MHz): –96dBc
LTC6404-4 (2V_P-P, 10MHz): –101dBc
n _{Closed-Loop –3dB Bandwidth: 600MHz}
n _{Slew Rate: 1200V/μs (LTC6404-4)}
n _{Adjustable Output Common Mode Voltage}
n _{Rail-to-Rail Output Swing}
n _{Input Range Extends to Ground}
n _{Large Output Current: 85mA (Typ)}
n _{DC Voltage Offset < 2mV (Max)}
n _{Low Power Shutdown}
n _{Tiny 3mm × 3mm × 0.75mm 16-Pin QFN Package}
APPLICATIONS
n _{Differential Input A/D Converter Driver}
n _{Single-Ended to Differential Conversion/Amplification}
n _{Common Mode Level Translation}
n _{Low Voltage, Low Noise, Signal Processing}
DESCRIPTION
The LTC^®6404 is a family of AC precision, very low noise,
low distortion, fully differential input/output amplifiers
optimized for 3V, single supply operation.
The LTC6404-1 is unity-gain stable. The LTC6404-2 is
designed for closed-loop gains greater than or equal to
2V/V. The LTC6404-4 is designed for closed-loop gains
greater than or equal to 4V/V. The LTC6404 closed-loop
bandwidth extends from DC to 600MHz. In addition to the
normal unfiltered outputs (OUT⁺ and OUT^–), the LTC6404
has a built-in 88.5MHz differential single-pole lowpass
filter and an additional pair of filtered outputs (OUTF⁺,
OUTF^–). An input referred voltage noise of 1.5nV/√Hz
make the LTC6404 able to drive state-of-the-art 16-/18-bit
ADCs while operating on the same supply voltage, saving
system cost and power. The LTC6404 is characterized, and
maintains its performance for supplies as low as 2.7V and
can operate on supplies up to 5.25V. It draws only 27.3mA,
and has a hardware shutdown feature which reduces cur-
rent consumption to 250μA.
The LTC6404 family is available in a compact 3mm × 3mm
16-pin leadless QFN package and operates over a –40°C
to 125°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
0.5V_P-P
0V
V_{S 50Ω}
100Ω
402Ω
SIGNAL
GENERATOR
71.5Ω
1.5VDC
0.1μF
130Ω
3V _0.1μF
+
V_OCM
–
402Ω
1V_P-P
1.5VDC
1.5VDC
1V_P-P
6404 TA01
LTC6404-4 Distortion vs Frequency
–40
V_CM = V_OCM = MID-SUPPLY
–50 V_S = 3V
–60
V_OUT = 2V_P-P
R_I = 100Ω, R_F = 402Ω
–70
DIFFERENTIAL INPUT
SINGLE-ENDED INPUT
–80
–90
HD2
–100
HD2
–110
–120 ^HD3 _HD3
–130
0.1
1
10
FREQUENCY (MHz)
100
64044 G16
6404f
1