Datasheet LT1994 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Low Noise, Low Distortion Fully Differential Input/Output Amplifier/Driver |
| Pages / Page | 20 / 1 — FEATURES. DESCRIPTION. Fully Differential Input and Output. Wide Supply … |
| File Format / Size | PDF / 232 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. Fully Differential Input and Output. Wide Supply Range: 2.375V to 12.6V. Rail-to-Rail Output Swing
Model Line for this Datasheet
Text Version of Document
LT1994 Low Noise, Low Distortion Fully Differential Input/ Output Amplifi er/Driver
FEATURES DESCRIPTION
n
Fully Differential Input and Output
The LT®1994 is a high precision, very low noise, low distor- n
Wide Supply Range: 2.375V to 12.6V
tion, fully differential input/output amplifi er optimized for n
Rail-to-Rail Output Swing
3V, single-supply operation. The LT1994’s output common n
Low Noise: 3nV/√Hz
mode voltage is independent of the input common mode n
Low Distortion, 2VP-P, 1MHz: –94dBc
voltage, and is adjustable by applying a voltage on the n
Adjustable Output Common Mode Voltage
VOCM pin. A separate internal common mode feedback n Unity-Gain Stable path provides accurate output phase balancing and reduced n Gain-Bandwidth: 70MHz even-order harmonics. This makes the LT1994 ideal for n Slew Rate: 65V/μs level shifting ground referenced signals for driving dif- n Large Output Current: 85mA ferential input, single-supply ADCs. n DC Voltage Offset <2mV Max The LT1994 output can swing rail-to-rail and is capable n Open-Loop Gain: 100V/mV of sourcing and sinking up to 85mA. In addition to the n Low Power Shutdown low distortion characteristics, the LT1994 has a low input n 8-Pin MSOP or 3mm × 3mm DFN Package referred voltage noise of 3nV/√Hz. This part maintains its performance for supply voltages as low as 2.375V. It
APPLICATIONS
draws only 13.3mA of supply current and has a hardware n Differential Input A/D Converter Driver shutdown feature that reduces current consumption to n Single-Ended to Differential Conversion 225μA. n Differential Amplifi cation with Common Mode The LT1994 is available in an 8-pin MSOP or 8-pin DFN Translation package. n Rail-to-Rail Differential Line Driver/Receiver L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. n Low Voltage, Low Noise, Differential Signal All other trademarks are the property of their respective owners. Processing
TYPICAL APPLICATION LT1994 Driving an LTC1403A-1 1MHz A/D Preamplifi er: Single-Ended Input to Differential Output Sine Wave, 8192 Point FFT Plot with Common Mode Level Shifting
0 fSAMPLE = 2.8Msps –10 fIN = 1.001MHz 499Ω 499Ω 3V 10μF –20 INPUT = 2VP-P, 3V SINGLE ENDED V –30 IN 0.1μF SFDR = 93dB 2VP-P –40 –50 24.9Ω VDD SD0 – + A + –60 IN CONV V LT1994 –70 47pF LTC1403A-1 OCM OUTPUT MAGNITUDE (dB) 24.9Ω 0.1μF SCK 50.4MHz –80 + – A – IN –90 GND VREF –100 V 10μF OCM = 1.5V 499Ω 499Ω 1994 TA01 DIFFERENTIAL –110 –120 0 0.35 0.70 1.05 1.40 FREQUENCY (MHz) 1994 TA01b 1994fb 1
FEATURES DESCRIPTION
n
Fully Differential Input and Output
The LT®1994 is a high precision, very low noise, low distor- n
Wide Supply Range: 2.375V to 12.6V
tion, fully differential input/output amplifi er optimized for n
Rail-to-Rail Output Swing
3V, single-supply operation. The LT1994’s output common n
Low Noise: 3nV/√Hz
mode voltage is independent of the input common mode n
Low Distortion, 2VP-P, 1MHz: –94dBc
voltage, and is adjustable by applying a voltage on the n
Adjustable Output Common Mode Voltage
VOCM pin. A separate internal common mode feedback n Unity-Gain Stable path provides accurate output phase balancing and reduced n Gain-Bandwidth: 70MHz even-order harmonics. This makes the LT1994 ideal for n Slew Rate: 65V/μs level shifting ground referenced signals for driving dif- n Large Output Current: 85mA ferential input, single-supply ADCs. n DC Voltage Offset <2mV Max The LT1994 output can swing rail-to-rail and is capable n Open-Loop Gain: 100V/mV of sourcing and sinking up to 85mA. In addition to the n Low Power Shutdown low distortion characteristics, the LT1994 has a low input n 8-Pin MSOP or 3mm × 3mm DFN Package referred voltage noise of 3nV/√Hz. This part maintains its performance for supply voltages as low as 2.375V. It
APPLICATIONS
draws only 13.3mA of supply current and has a hardware n Differential Input A/D Converter Driver shutdown feature that reduces current consumption to n Single-Ended to Differential Conversion 225μA. n Differential Amplifi cation with Common Mode The LT1994 is available in an 8-pin MSOP or 8-pin DFN Translation package. n Rail-to-Rail Differential Line Driver/Receiver L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. n Low Voltage, Low Noise, Differential Signal All other trademarks are the property of their respective owners. Processing
TYPICAL APPLICATION LT1994 Driving an LTC1403A-1 1MHz A/D Preamplifi er: Single-Ended Input to Differential Output Sine Wave, 8192 Point FFT Plot with Common Mode Level Shifting
0 fSAMPLE = 2.8Msps –10 fIN = 1.001MHz 499Ω 499Ω 3V 10μF –20 INPUT = 2VP-P, 3V SINGLE ENDED V –30 IN 0.1μF SFDR = 93dB 2VP-P –40 –50 24.9Ω VDD SD0 – + A + –60 IN CONV V LT1994 –70 47pF LTC1403A-1 OCM OUTPUT MAGNITUDE (dB) 24.9Ω 0.1μF SCK 50.4MHz –80 + – A – IN –90 GND VREF –100 V 10μF OCM = 1.5V 499Ω 499Ω 1994 TA01 DIFFERENTIAL –110 –120 0 0.35 0.70 1.05 1.40 FREQUENCY (MHz) 1994 TA01b 1994fb 1
