LT6411_15 Datasheet, PDF (1/16 Pages) Linear Technology – 650MHz Differential ADC Driver/Dual Selectable Gain Amplifi er

FEATURES
■ _{650MHz –3dB Small-Signal Bandwidth}
■ _{600MHz –3dB Large-Signal Bandwidth}
■ _{High Slew Rate: 3300V/µs}
■ _{Easily Configured for Single-Ended to Differential}
Conversion
■ _{200MHz ±0.1dB Bandwidth}
■ _{User Selectable Gain of +1, +2 and –1}
■ _{No External Resistors Required}
■ _{46.5dBm Equivalent OIP3 at 30MHz When Driving an}
ADC
■ _{IM3 with 2VP-P Composite, Differential Output:}
–87dBc at 30MHz, –83dBc at 70MHz
■ _{–77dB SFDR at 30MHz, 2VP-P Differential Output}
■ _{6ns 0.1% Settling Time for 2V Step}
■ _{Low Supply Current: 8mA per Ampifier}
■ _{Differential Gain of 0.02%, Differential Phase of 0.01°}
■ _{50dB Channel Separation at 100MHz}
■ _{Wide Supply Range: ±2.25V (4.5V) to ±6.3V (12.6V)}
■ _{3mm × 3mm 16-Pin QFN Package}
APPLICATIONS
■ _{Differential ADC Driver}
■ _{Single-Ended to Differential Conversion}
■ _{Differential Video Line Driver}
LT6411
650MHz Differential ADC
Driver/Dual Selectable
Gain Amplifier
DESCRIPTION
The LT^®6411 is a dual amplifier with individually selectable
gains of +1, +2 and –1. The amplifiers have excellent dis-
tortion performance for driving ADCs as well as excellent
bandwidth and slew rate for video, data transmission and
other high speed applications. Single-ended to differential
conversion with a system gain of 2 is particularly straight-
forward by configuring one amplifier with a gain of +1
and the other amplifier with a gain of –1. The LT6411 can
be used on split supplies as large as ±6V and on a single
supply as low as 4.5V.
Each amplifier draws only 8mA of quiescent current when
enabled. When disabled, the output pins become high
impedance and each amplifier draws less than 350µA.
The LT6411 is manufactured on Linear Technology’s
proprietary, low voltage, complimentary, bipolar process
and is available in the ultra-compact, 3mm × 3mm, 16pin
QFN package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Differential ADC Driver
5V
V_CC
LT6411
+
24Ω
1.9V_DC
30MHz
INPUT
370Ω
370Ω
–
370Ω
370Ω
1.9V_DC
–
24Ω
+
V_EE
DGND
EN
A_IN–
LTC2249
14-BIT ADC
A_IN+ ^80Msps
6411 TA01a
30MHz 2-Tone 32768 Point FFT, LT6411
Driving an LTC^®2249 14-Bit ADC
0
–10 ^{32768 POINT FFT}
–20
TONE 1 AT 29.5MHz, –7dBFS
TONE 2 AT 30.5MHz, –7dBFS
–30 _{IM3 = –87dBc}
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
0 5 10 15 20 25 30
FREQUENCY (MHz)
35 40
6411 TA01b
6411f
1