Optimizing THS4509 to Drive High Speed ADCs Reference Design
TIDA-00093
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Description
This reference design shows the ability of the high-speed amplifier, THS4509 to perform single-ended to differential conversion to drive high-speed analog-to-digital converters (ADCs) while maintaining excellent noise and distortion performance. Performance versus input frequency is shown for both AC and DC coupled applications while interfaced to the ADS4449 quad, 250-MSPS, 14-bit ADC. Various options for common-mode voltages, power supplies, and interfaces are discussed and measured to meet the requirements of a variety of applications. Anti-aliasing filter examples are shown along with the performance improvements that they provide.
Features
- High-speed single-ended to differential conversion while maintain excellent performance
- System performance results for THS4509 driving ADS4449
- SFDR > 77 dBFs, SNR > 71 dBFS in first Nyquist zone
- SFDR > 69 dBFs, SNR > 67 dBFS in second Nyquist zone
- Examples of both AC and DC coupled interfaces
- Demonstrates anti-aliasing filter design and performance gains
- Amplifier power supply design considerations for best performance are discussed
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Schematic/Block Diagram
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Test Data
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TI Devices (8)
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| Sample & Buy |
Design Kits & Evaluation Modules |
| ADS4449 |
Quad-Channel, 14-Bit, 250-MSPS Analog-to-Digital Converter (ADC) |
Analog-to-digital converters (ADCs) |
Sample & Buy |
View Design Kits & Evaluation Modules |
| LMH6554 |
2.8 GHz Ultra Linear Fully Differential Amplifier |
RF amplifiers |
Sample & Buy |
View Design Kits & Evaluation Modules |
| LMH6881 |
2.4GHz Programmable Differential Amplifier with Gain Control |
RF amplifiers |
Sample & Buy |
View Design Kits & Evaluation Modules |
| THS4509 |
1.9-GHz, Wideband, Low-Noise, Low-Distortion, Fully-Differential Amplifier |
RF amplifiers |
Sample & Buy |
View Design Kits & Evaluation Modules |
| THS770006 |
High-Speed Fully Differential ADC Driver Amplifier with +6dB Fixed Gain |
RF amplifiers |
Sample & Buy |
View Design Kits & Evaluation Modules |
| TPS2400 |
5.5-V over voltage protection controller with 100-V input transient protection |
Power switches |
Sample & Buy |
View Design Kits & Evaluation Modules |
| TPS62420 |
Dual, Adjustable, 600mA and 1000mA, 2.25MHz Step-Down Converter with 1-Wire Interface in QFN |
Step-down (buck) regulators |
Sample & Buy |
View Design Kits & Evaluation Modules |
| TPS7A80 |
1-A, high-PSRR, ultra-low-dropout voltage regulator with low-IQ & enable |
Power management |
Sample & Buy |
View Design Kits & Evaluation Modules |
CAD/CAE symbols
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Technical documentation
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User guides (1)
| Title | Type | Size (KB) | Date |
| | PDF | 605 |
24 Mar 2014
|
Design files (3)
| | ZIP | 1598 |
17 Nov 2014
|
| | PDF | 276 |
17 Nov 2014
|
| | PDF | 138 |
17 Nov 2014
|
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