Custom Fpga Code, Expansion Slot | Texas Instruments 47, 46, 27, 45

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Expansion Options

4Expansion Options

The EVM offers several exciting possibilities to expand the capabilities of the EVM. This allows the utmost flexibility when prototyping an ADC circuit under conditions that mimic the end system, without the need to develop a custom prototype board.

4.1Custom FPGA Code

Using a standard JTAG interface on JP1, users have the ability to load custom logic onto the FPGA, rapidly speeding up digital development time. This allows the flexibility of prototyping and debugging an ADC digital interface design before developing application-specific hardware.

To take advantage of the onboard FPGA, users can download the free Xilinx WebPACK™ from the Xilinx Web site. Select the XC3S250E-4FT256 as the FPGA and the XCF16PFSG48 as the PROM.

Note: See the Xilinx Spartan-3E Web site for complete documentation of the FPGA at:

http://direct.xilinx.com/bvdocs/publications/ds312.pdf

Schematically, the FPGA is configured in BPI mode, and it samples FPGA pins M2, M1, and M0 when the FPGA'sINIT_B is brought low. Depending of the status of M0, it boots from either the top or the bottom of the PROM contents. The PROM allows for the storage of two FPGA bit files. In its default condition, the EVM stores one file for ADC CMOS output at the beginning of the PROM address space and one file for ADC LVDS output at the end of the PROM address space.

Note: When creating custom FPGA code, store any custom-developed bit files for ADC CMOS operation in the PROM revision 0 space, and store any custom-developed FPGA code for ADC LVDS operation in the PROM revision 1 space.

4.2Expansion Slot

For those users who make use of a custom FPGA program on the EVM, J5 and J6 provide an expansion-slot capability. Users can design daughtercards or breakout boards to make use of the unused FPGA I/O pins which are brought out to the headers.

Note: The EVM provides 5 V from J14 to pin 1 of both J5 and J6. This can be used to provide power to any designed daughtercards.

4.3Optional USB SPI Interface

In most cases, users can use the ADC parallel interface mode to change the operational modes of the ADC. For users requiring SPI control of the ADC, TI has developed an optional USB daughter card that plugs into the expansion slot. With the USB daughter card, users can use a PC interface to communicate to the ADC three-wire SPI interface, which allows for complete control of the ADC register map. Contact the factory for this optional accessory.

SLWU028B –January 2006 –Revised November 2006

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ADS5525, 27, 47, 45, 46 specifications

Texas Instruments is a leader in the field of analog and mixed-signal semiconductors and offers a diverse portfolio of high-performance products. Among its notable offerings are the ADCs (Analog-to-Digital Converters) such as the TI 46, 45, 47, 27, and the ADS5525. These devices are engineered to meet the demanding requirements of various applications, including communications, industrial, and medical systems.

The Texas Instruments 46 series ADCs are recognized for their high speed and precision. They utilize a 14-bit architecture with sampling rates of up to 1.5 GSPS, which makes them ideal for high-frequency applications such as communications and instrumentation. One of the key features is their ability to support a wide input bandwidth, which allows for accurate conversions of high-frequency signals.

The 45 series, similar in architecture, excels in environments where power efficiency is paramount. These ADCs are designed to consume less power while maintaining high performance. They offer a flexible sampling rate, providing options for both lower and higher intensity applications. This versatility is essential for handheld and portable devices where battery life is crucial.

Moving on to the 47 family, these devices focus on achieving high dynamic range and low distortion. Their architecture includes sophisticated digital filter options, enhancing the capability of noise reduction and signal integrity. With an impressive signal-to-noise ratio, the 47 series finds its usage in systems where performance cannot be compromised, such as high-end audio and video applications.

The 27 series ADCs provide an excellent combination of high performance and low latency, making them suitable for real-time analysis in various scenarios. They are equipped with advanced data acquisition features and can communicate seamlessly with modern digital signal processors and microcontrollers.

Finally, the ADS5525 is a standout in the lineup, offering a 12-bit resolution at a maximum sampling rate of 125 MSPS. This device is designed for a range of applications, including medical imaging and ultrasound systems. It boasts features such as an integrated digital filter and multiple power-saving modes, making it versatile and efficient in terms of energy consumption.

In summary, Texas Instruments' ADC lineup, including the 46, 45, 47, 27, and ADS5525, offers numerous features and technologies, catering to a wide range of applications through their respective specifications of speed, power efficiency, dynamic range, and ease of integration. These devices illustrate Texas Instruments' commitment to providing innovative solutions in the analog and mixed-signal domain.