Adjacent Channel Power Ratio (ACPR) and Error Vector Magnitude (%EVM) Measurements
TIDA-00076: This reference design discusses the use of the TSW3085EVM with the TSW3100 pattern generator to test adjacent channel power ratio (ACPR) and error vector magnitude (EVM) measurements of LTE baseband signals. By using the TSW3100 LTE GUI, patterns are loaded into the TSW3085EVM which is comprised of the DAC3482, TRF3705, and LMK04806.
Altera Arria V GZ FPGA Discrete Power Solution Reference Design
PMP9357: The PMP9357 reference design is a complete power solution for Altera's Arria V series FPGAs. This design uses several TPS54620 synchronous step down converters, LDOs, and a DDR termination regulator to provide all the necessary rails to power the FPGA. To provide correct power sequencing, a UCD90120A power supply sequencer/monitor is used and can be controlled through I2C.
Altera Arria V GX FPGA Power Solution Reference Design
PMP9449: The PMP9449 reference design provides all the power supply rails necessary to power Altera's Arria® V GX family of FPGAs. It utilizes a TPS38600 to monitor the input supply and provide power on sequencing. This design features low cost, small footprint discrete ICs and is powered from a single 5V input.
Optimizing LMH6554 to Drive High Speed ADCs
TIDA-00092: This reference design shows the ability of the high-speed amplifier, LMH6554, 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.
1-GHz Bandwidth Dual Channel Transmitter up to 4-GHz Reference Design
TIDA-00409: The TSW38J84 EVM reference design provides a platform to demonstrate a wideband dual transmit solution that incorporates an integrated LO. The reference design utilizes the 2.5 GSPS DAC38J84 device with the high performance modulators: TRF3722 (including integrated PLL/VCO) and TRF3705. The TRF3722 and TRF3705 can be combined to form a dual transmit solution with the TRF3722 generating the local oscillator (LO) for both modulators. The interface between the DAC38J84 and the modulators is discussed as well as measurements showing the combined performance of the DAC and modulators. The measurements illustrate the bandwidth performance, output third order intercept performance, harmonic distortion and sideband suppression performance.
Schematic and Layout Recommendations for the Giga Sample Per Second (GSPS) ADC
TIDA-00071: This reference design is a guide to the schematics and layout for the system designer using a GSPS ADC in their system. Use this reference design along with the datasheet — the datasheet is always the final authority. Also, the ADC1xDxxxx(RF)RB Reference Board provides a useful reference design. All design source files for the Reference Board as well as the CAD/CAE symbols for the ADC are available on the product web page or TI-Designs for download. For the purpose of this document, ADC or GSPS ADC refers to the ADC12D1800RF, ADC12D1600RF, ADC12D1000RF, ADC12D800RF, ADC12D500RF, ADC12D1800, ADC12D1600, ADC12D1000, ADC10D1500, ADC10D1000, ADC12D1600QML, and ADC10D1000QML.
Synchronizing Multiple JESD204B ADCs for Emitter Position Location Reference Design
TIDA-00467: A common technique to estimate the position of emitters uses the amplitude and phase shift data of a signal derived from an array of spatially distributed sensors. For such systems, it is important to guarantee a deterministic phase relationship between the sensors to minimize errors in the actual measured data. This application design will discuss how multiple Analog to Digital Converters (ADCs) with a JESD204B interface can be synchronized so that the sampled data from the ADCs are phase aligned.