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LT1994 Datasheet, PDF (1/20 Pages) Linear Technology – Low Noise, Low Distortion Fully Differential Input/Output Amplifi er/Driver | |||
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FEATURES
â Fully Differential Input and Output
â Wide Supply Range: 2.375V to 12.6V
â Rail-to-Rail Output Swing
â Low Noise: 3nV/âHz
â Low Distortion, 2VP-P, 1MHz: â94dBc
â Adjustable Output Common Mode Voltage
â Unity Gain Stable
â Gain-Bandwidth: 70MHz
â Slew Rate: 65V/μs
â Large Output Current: 85mA
â DC Voltage Offset <2mV MAX
â Open-Loop Gain: 100V/mV
â Low Power Shutdown
â 8-Pin MSOP or 3mm à 3mm DFN Package
U
APPLICATIO S
â Differential Input A/D Converter Driver
â Single-Ended to Differential Conversion
â Differential Ampliï¬cation with Common Mode
Translation
â Rail-to-Rail Differential Line Driver/Receiver
â Low Voltage, Low Noise, Differential Signal
Processing
LT1994
Low Noise, Low Distortion
Fully Differential Input/
Output Ampliï¬er/Driver
DESCRIPTIO
The LT®1994 is a high precision, very low noise, low distor-
tion, fully differential input/output ampliï¬er optimized for
3V, single supply operation. The LT1994âs output common
mode voltage is independent of the input common mode
voltage, and is adjustable by applying a voltage on the
VOCM pin. A separate internal common mode feedback
path provides accurate output phase balancing and reduced
even-order harmonics. This makes the LT1994 ideal for
level shifting ground referenced signals for driving dif-
ferential input, single supply ADCs.
The LT1994 output can swing rail-to-rail and is capable
of sourcing and sinking up to 85mA. In addition to the
low distortion characteristics, the LT1994 has a low input
referred voltage noise of 3nV/âHz. This part maintains
its performance for supply voltages as low as 2.375V. It
draws only 13.3mA of supply current and has a hardware
shutdown feature that reduces current consumption to
225µA.
The LT1994 is available in an 8-pin MSOP or 8-pin DFN
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
A/D Preampliï¬er: Single-Ended Input to Differential Output with Common
Mode Level Shifting
VIN
2VP-P
499â¦
0.1µF
499â¦
3V
0.1µF
24.9â¦
â+
VOCM LT1994
24.9â¦
47pF
+â
VOCM = 1.5V
3V
10µF
AIN+
VDD SD0
CONV
LTC1403A-1
SCK
AINâ
GND VREF
50.4MHz
10µF
499â¦
499â¦
1994 TA01
LT1994 Driving an LTC1403A-1 1MHz
Sine Wave, 8192 Point FFT Plot
0
â10
FSAMPLE = 2.8Msps
FIN = 1.001MHz
â20 INPUT = 2VP-P,
â30
SINGLE ENDED
SFDR = 93dB
â40
â50
â60
â70
â80
â90
â100
â110
â120
0
0.35
0.70
1.05
FREQUENCY (MHz)
1.40
1994 TA01b
1994fa
1
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