Features and Benefits
- Fully Differential Input and Output
- Wide Supply Range: 2.375V to 12.6V
- Rail-to-Rail Output Swing
- Low Noise: 3nV/√Hz
- Low Distortion, 2VP-P, 1MHz: –94dBc
- Adjustable Output Common Mode Voltage
- Unity Gain Stable
- Gain-Bandwidth: 70MHz
- Slew Rate: 65V/μs
- Large Output Current: 85mA
- DC Voltage Offset <2mV MAX
- Open-Loop Gain: 100V/mV
- Low Power Shutdown
- 8-Pin MSOP or 3mm × 3mm DFN Package
The LT1994 is a high precision, very low noise, low distortion, fully differential input/output amplifier optimized for 3V, single supply operation. The LT1994’s 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 differential 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/√Hz. 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.
- Differential Input A/D Converter Driver
- Single-Ended to Differential Conversion
- Differential Amplifier cation with Common Mode Translation
- Rail-to-Rail Differential Line Driver/Receiver
- Low Voltage, Low Noise, Differential Signal Processing
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
DC1058A-A: Demo Board for the LT1994 Low Noise, Low Distortion Fully Differential Input/Output Amplifier/Driver and LTC2203 16-Bit, 25Msps ADCs.
Demonstration circuit 961 features an LT1994, low noise, low distortion, fully differential amplifier. The LT1994 is a high precision, very low noise, low distortion, fully differential input/output amplifier. The LT1994’s output common mode voltage is independent of the input common mode voltage, and is adjustable by applying a voltage on the VOCM pin. The DC961 board contains an LT1994 amplifier configured as a unity gain differential amplifier with 499Ω feedback and input resistors. Gains greater than one require changing the input resistors to a value lower than 499Ω. In addition, DC961 has surface mount pads and traces for resistors and capacitors for building first and second order fully differential filter circuits. The differential outputs of DC961 can be configured with a first order RC network for driving the differential inputs of an analog-to-digital converter (ADC).
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
Sys-Parameter models contain behavioral parameters, such as P1dB, IP3, gain, noise figure and return loss, which describe nonlinear and linear characteristics of a device.
ADI's new ADI DiffAmpCalc™ is a free, downloadable calculator for designing differential amplifier circuits. The tool is easy to use and features an interactive user interface to quickly get you up and running.
ADIsimRF is an easy-to-use RF signal chain calculator. Cascaded gain, noise, distortion and power consumption can be calculated, plotted and exported for signal chains with up to 50 stages. ADIsimRF also includes an extensive data base of device models for ADI’s RF and mixed signal components.
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.