TIDA-00094
Quad-Channel 250-Msps Digitizer with Variable Gain Amplifier Reference Design
TIDA-00094
Overview
This reference design shows a quad channel, 14-bit, 250-Msps digitizer with wide input range using the LMH6881 programmable differential amplifier and ADS4449 quad-channel, 14-bit, 250-Msps ADC. This combination allows an input voltage range of approximately 1 Vpp to 100 uVpp (4 dBm to -75 dBm) while maintaining a minimum SNR of 6 dB. Performance versus input frequency is shown for both AC and DC coupled applications. 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
- Gain range of 6-dB to 26-dB allows wide input voltage range of 100 uVpp to 1 Vpp
- Allows single-ended or differential input source
- SFDR > 77 dBFs, SNR > 71 dBFS
- Examples of both AC and DC coupled interfaces
- Demonstrates anti-aliasing filter design and performance gains
- Common mode voltage considerations for best performance are discussed
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
Design files & products
Design files
Download ready-to-use system files to speed your design process.
TIDU174.PDF (542 K)
Reference design overview and verified performance test data
TIDCA30.ZIP (1595 K)
Detailed schematic diagram for design layout and components
TIDRDZ8.PDF (179 K)
Detailed schematic diagram for design layout and components
TIDRDZ9.PDF (305 K)
Complete listing of design components, reference designators, and manufacturers/part numbers
Products
Includes TI products in the design and potential alternatives.
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Technical documentation
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| Type | Title | Date | ||
|---|---|---|---|---|
| Design guide | Quad-Channel 250-Msps Digitizer With Variable Gain Amplifier Design Guide | Mar. 30, 2014 |
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