12-bit, 500- to 900-MSPS ADCs aim to slash board space by 80 percent
The ADS5409 family claims to provide best-in-class performance in a smaller footprint and at the lowest power consumption to meet the size, power and performance needs of test and measurement equipment, wideband LTE and LTE-advanced communications base stations, millimeter wave backhaul (v-band and e-band), cable infrastructure return path and defense electronics.
Wideband LTE and LTE-advanced power amplifier linearization previously required large, expensive and high-power-consumption feedback ADCs for speeds greater than 500 MSPS. The ADS5409 family addresses these challenges by reducing IC size, cost and power, while providing the high performance needed to achieve transmit spectral mask requirements and improved power amplifier efficiency.
The pin-compatible ADS5409 family includes six 1- and 2-channel ADCs at a variety of speed grades and price points to meet system needs.
The ADS5409 family’s 12-mm by 12-mm footprint reduces board space by 80 percent over current devices, enabling the use of wideband ADCs in applications where they would not have fit previously, such as small form factor remote radio units.
The device provides 2-dB higher SNR and 10-dBc higher SFDR than existing solutions at speeds up to 900 MSPS while reducing power up to 20 percent.
An optional 2x decimation filter eases analog filter requirements and reduces the data interface rate by half.
The ADS5409 family also provides power amplifier linearization bandwidths up to 900 MHz for fifth order digital pre-distortion of a 180-MHz transmit signal.
Evaluation modules (EVMs) for the ADS5409 and ADS54T02 families can be purchased from the TI eStore for a suggested retail price of US$499. IBIS models are also available for verifying board signal integrity requirements.
For more extensive system-level evaluation, the TSW1400EVM data capture and pattern generation board provides a complete system to capture and evaluate data samples from high-speed ADC EVMs, and to generate and send desired test patterns to the high-speed digital-to-analog converter (DAC) EVMs. The complementary TSW1405EVM provides simple pattern capture with up to 64k sample depth.
For wideband digital pre-distortion (DPD) development, the TSW1266EVM DPD feedback reference design includes the 2-channel, 12-bit, 800-MSPS ADS5402 ADC, TI’s 2-channel LMH6521 digital variable gain amplifier (DVGA), LMK04808 dual-PLL clock jitter cleaner and a complex demodulator. The reference design can be configured for a variety of frequency plans by modifying the onboard filter components.
Availability and Pricing
The 12-bit ADS5409 family includes the following devices, most which are available in a 12-mm by 12-mm BGA package:
ADS5401: 1 channel at 800 MSPS for $187.50
ADS5403: 1 channel at 500 MSPS for $125.00
ADS5404: 2 channel at 500 MSPS for $218.75
ADS5407: 2 channel at 500 MSPS for $239.95
ADS5402: 2 channel at 800 MSPS for $349.65
ADS5409: 2 channel at 900 MSPS for $393.35; will be available in June 2013
The 12-bit ADS54T02 family is also available today and includes the following devices in a 12-mm by 12-mm BGA package:
ADS54T01: 1 channel at 750 MSPS for $187.50
ADS54T04: 2 channel at 500 MSPS for $349.65
ADS54T02: 2 channel at 750 MSPS for $218.75
More information about the ADS5407 ADCs at
www.ti.com/ads5409family-pr-eu
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