The ADS58C48 is a 4-channel 11-bit analog-to-digital converter (ADC) with a sampling frequency of up to 200MSPS introduced by Texas Instruments. It operates from a single power supply of 1.8V and has a total power consumption of 0.9W. ADS58C48 adopts SNRBoost3G technology, SFDR at 140MHz is 82dBc, supports bandwidth up to 60MHz, can improve in-band information for multi-carrier and multi-mode communication systems (such as CDMA, WCDMA, TD-SCDMA, LTE and WiMAX, etc.) that require high signal bandwidth Noise ratio (SNR). ADS58C48's SNRBoost technology can improve the SNR of 4.3dB at 185MSPS for the entire 60MHz bandwidth, which can increase the bandwidth and sensitivity for various communications, satisfying RRH (Remote Radio Head), software radio, wireless repeater and MIMO diversity receiver, etc. Application requirements.
ADS58C48 key features and advantages
1. Programmable SNRBoost technology can achieve SNR performance up to 72.3dB at 60MHz bandwidth, or SNR performance up to 75.4db at 30MHz bandwidth, thus meeting customer 3G and 4G receiver sensitivity specifications;
2. Low power consumption: the power consumption per channel is 215mW at 200MSPS, which can help manufacturers successfully design low-power high-density four-channel receivers and digital predistortion (DPD) feedback loops;
3. The output can choose CMOS or DDR LVDS, which can realize the convenient connection with TI GC53xx digital RF products, FPGA and digital ASIC solutions;
4. The complete signal chain including DAC3484, LMH6522 / 1, TRF3705, LMH04808, GC5330, LMX2531 / 2581 and TMS320C6748 can accelerate the time to market of products.
5. Support SNRBoost switching, which can be used for both receiving and DPD links.
As part of the complete signal chain, the ADS58C48 four-channel ADC can be seamlessly connected to TI's DVGA (such as LMH6522 / 1) and power amplifier predistortion (DPD) chips GC5330, GC5337, etc. At the same time, TI provides complete clock distribution LMK04808 and local oscillator LMX2531 / 2581 solution.
ADS58C48 is a 4-channel product. It uses TI's patented SNRBoost technology, which can improve the signal-to-noise ratio to reach the signal-to-noise ratio of 14bit ADC, can be used in the receiving channel of the communication system, and also supports SNRBoost function off, making it a standard 11bit 200Mhz ADC, It can be used in the DPD feedback receiving channel of the communication system. 
Introduction to time division communication system (TDD) Time division communication system refers to the different time slots in the mobile communication system where the reception and transmission are on the same frequency channel or carrier, and the guaranteed time is used to separate the reception and transmission channels; the TDD mode in the mobile communication system The horizontal channel uses the same frequency, so it has the reciprocity of the uplink and downlink channels, which brings many advantages to the TDD mode mobile communication system. For example, it does not need to allocate the frequency of the symmetrical frequency band, and can flexibly control in each channel, change the ratio of the time slot of the sending and receiving periods, and other advantages. The time-division system has the advantages of high signal quality, better security, and larger system capacity, but it must have precise timing and synchronization to ensure normal communication between the mobile terminal and the base station, which is technically more complicated.
As the high-power transmission of the mobile system transmitter and the signal PAR due to the new modulation method become larger, the transmission power of the power amplifier is being pushed to a limit that has never been seen before. High-power amplifiers bring a series of problems, such as power consumption, cost, heat dissipation, reliability, etc., so it is necessary to improve the efficiency of the power amplifier. Digital pre-distortion (DPD) has advantages in improving efficiency, multi-carrier applications, correction effects and self-adaptive capabilities, and has almost become the standard of the new system. The following figure is a typical time division communication system with DPD function. 
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