LTC6409 Datasheet, PDF (1/24 Pages) Linear Technology – 10GHz GBW, 1.1nV/Hz Differential Amplifier/ADC Driver

Features
n _{10GHz Gain-Bandwidth Product}
n _{88dB SFDR at 100MHz, 2VP-P}
n _{1.1nV/√Hz Input Noise Density}
n _{Input Range Includes Ground}
n _{External Resistors Set Gain (Min 1V/V)}
n _{3300V/µs Differential Slew Rate}
n _{52mA Supply Current}
n _{2.7V to 5.25V Supply Voltage Range}
n _{Fully Differential Input and Output}
n _{Adjustable Output Common Mode Voltage}
n _{Low Power Shutdown}
n _{Small 10-Lead 3mm × 2mm × 0.75mm QFN Package}
Applications
n _{Differential Pipeline ADC Driver}
n _{High-Speed Data-Acquisition Cards}
n _{Automated Test Equipment}
n _{Time Domain Reflexometry}
n _{Communications Receivers}
LTC6409
10GHz GBW, 1.1nV/√Hz
Differential Amplifier/ADC
Driver
Description
The LTC^®6409 is a very high speed, low distortion, dif-
ferential amplifier. Its input common mode range includes
ground, so that a ground-referenced input signal can be
DC-coupled, level-shifted, and converted to drive an ADC
differentially.
The gain and feedback resistors are external, so that the
exact gain and frequency response can be tailored to each
application. For example, the amplifier could be externally
compensated in a no-overshoot configuration, which is
desired in certain time-domain applications.
The LTC6409 is stable in a differential gain of 1. This al-
lows for a low output noise in applications where gain is
not desired. It draws 52mA of supply current and has a
hardware shutdown feature which reduces current con-
sumption to 100µA.
The LTC6409 is available in a compact 3mm × 2mm 10‑pin
leadless QFN package and operates over a –40°C to 125°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
DC-Coupled Interface from a Ground-Referenced Single-Ended
Input to an LTC2262-14 ADC
1.3pF
V_{IN 150Ω}
V_OCM = 0.9V
150Ω
150Ω
3.3V
–+
LTC6409
+–
150Ω
1.3pF
33.2Ω
33.2Ω
39pF
10Ω
10Ω
39pF
1.8V
A_IN+
V_DD
LTC2262-14 ADC
A_IN–
GND
6409 TA01
LTC6409 Driving LTC2262-14 ADC,
f_IN = 70MHz, –1dBFS,
f_S = 150MHz, 4096-Point FFT
0
–10
V_S = 3.3V
V_OUTDIFF = 1.8V_P-P
–20 HD2 = –86.5dBc
–30
HD3 = –89.4dBc
SFDR = 81.6dB
–40 _{SNR = 71.1dB}
–50
–60
–70
–80
–90
–100
–110
–120
0 10 20 30 40 50 60 70
FREQUENCY (MHz)
6409 TA01b
6409fa
1