National Semiconductor Corporation launches the LMP8350 – ultra low distortion fully differential precision ADC driver with selectable power modes from the PowerWise family.
Features
- Differential Input and Output
- Tri-Level Power Settings with Shutdown
- Ultra Low HD2/HD3 and THD+N Distortion
- Adjustable Output Common Mode Level
- Fully Balanced Differential Architecture
- Single or Dual Supply Operation
Description
The LMP8350 is an ultra low distortion fully differential amplifier designed for driving high-performance precision analog-to-digital converters (ADC). As part of the PowerWise family, a unique mode enable pin allows the user to choose from three different operating modes, trading power consumption for dynamic performance.
The high power mode is optimized for highest AC performance. The low noise, wide bandwidth and fast slew rate makes the LMP8350 ideal for driving 24bit ADCs with input sampling rates of 10MHz or less. The medium power mode is optimized for precision DC performance, and can be used to drive 24-bit ADCs with input sampling rates of 6MHz or less. The low power mode is a trade-off between AC performance and quiescent current for power sensitive applications. The disable mode fully shuts-down the amplifier for further standby power savings.
The fully differential architecture of this device allows for easy implementation of a single-ended to fully-differential output conversion. Driving a 3Vpp, 1kHz output sine wave with the amplifier powered by ±3.3V rails in high power mode yields 0.000098% THD+N.
The LMP8350 is part of the LMP precision amplifier family. It is offered in the 8-pin SOIC package and has an operating temperature range of −40°C to +85°C.
Typical Application Circuit
Key Specification
(TA = 25°C, VS = +10V, RL = 2kΩ//20pF, typical values unless otherwise specified)
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Operating voltage range
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4.5V to 12V
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Supply current
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3 to 13mA
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Total THD+N @ 1KHz
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0.000097%
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HD2 / HD3 Distortion @ 1KHz
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< –124 dBc
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Bandwidth
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118 MHz
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Settling to 0.1%
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20 ns
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Low Offset Drift
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0.4 µV/°C
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Offset Voltage
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80µV
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Voltage Noise
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4.6 nV/Hz
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Operating temperature range
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−40°C to +85°C
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Applications
- High Resolution Differential ADC Driver
- Portable instrumentation
- Precision Line Driver
