Quad-Channel 250-Msps Digitizer with Variable Gain Amplifier Reference Design
Description
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 VppAllows single-ended or differential input sourceSFDR > 77 dBFs: SNR > 71 dBFSExamples of both AC and DC coupled interfacesDemonstrates anti-aliasing filter design and performance gainsCommon mode voltage considerations for best performance are discussed
Applications
- Digital multimeter (DMM)
Product Categories
- Data converters
| Application Area | End Equipment |
|---|---|
| Digital multimeter (DMM) | https://www.ti.com/solution/digital-multimeter-dmm#referencedesigns |
| Download |
|---|
| Download the bill of materials for TIDA-00094 | Download |
Test Data
Get results faster with test and simulation data that's been verified.
Download the test file for TIDA-00094| Title | Updated | Type | Size (KB) | |
|---|---|---|---|---|
| TIDA-00094 BOM | 07 Apr 2015 | 305 | ||
| TIDA-00094 Schematic and Block Diagram | 07 Apr 2015 | 179 |