THS4508
宽带全差动放大器
* Fully Differential Architecture
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- Common-Mode Input Range Includes the
Negative Rail
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- Minimum Gain of 2 V/V 6 dB
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- Bandwidth: 2 GHz
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- Slew Rate: 6400 V/µs
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- 1% Settling Time: 2 ns
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- HD2: -72 dBc at 100 MHz
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- HD3: -79 dBc at 100 MHz
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- OIP2: 78 dBm at 70 MHz
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- OIP3: 42 dBm at 70 MHz
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- Input Voltage Noise: 2.3 nV/√Hz f > 10 MHz
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- Noise Figure: 19.2 dB G = 10 dB
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- Output Common-Mode Control
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- 5-V Power Supply Current: 39.2 mA
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- Power-Down Capability: 0.65 mA
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- APPLICA ONS
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- 5-V Data-Acquisition Systems
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- High Linearity ADC Amplifier
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- Wireless Communication
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- Medical Imaging
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- Test and Measurement
## DESCRIPTION
The is a wideband, fully-differential operational amplifier designed for single-supply 5-V data acquisition systems. It has very low noise at 2.3 nV/√Hz, and extremely low harmonic distortion of -72 dBc HD2 and -79 dBc HD3 at 100 MHz with 2 VPP, G = 10 dB, and 1-Ω load. Slew rate is very high at 6400 Vµs, and with settling time of 2 ns to 1% 2 V step, it is ideal for pulsed applications. It is designed for minimum gain of 6 dB, but is optimized for gain of 10 dB.
To allow for dc coupling to analog-to-digital converters ADCs, its unique output common-mode control circuit maintains the output common-mode voltage within 5-mV offset typical from the set voltage, when set within 0.5 V of mid-supply. The common-mode set point is set to mid-supply by internal circuitry, which may be over-driven from an external source.
The THS4508 is a high-performance amplifier that has been optimized for use in high performance, 5-V single-supply data acquisition systems. The output has been optimized for best performance with its common-mode voltages set to mid-supply, and the input has been optimized for best performance with its common-mode voltage set to 0.7 V. High performance at a low power-supply voltage is ideal for high-performance, single-supply 5-V data-acquisition systems with a minimum parts count. The combined performance of the THS4508 in a gain of 10-dB driving the ADS5500 ADC, sampling at 125 MSPS, is 82-dBc SFDR, and 68.3-dBc SNR with a -1-dBFS signal at 70 MHz.
The THS4508 is offered in a quad 16-pin leadless QFN package RGT, and is characterized for operation over the full industrial temperature range from -40°C to +85°C.
