Texas Instruments AFE76xx RF-Sampling Analog Front Ends (AFEs)
Texas Instruments AFE76xx RF-Sampling Analog Front Ends (AFEs) are high-performance, quad/dual channel, 14-bit, integrated RF sampling analog front ends (AFEs) with 9 GSPS DACs and 3 GSPS ADCs. These devices are capable of synthesizing and digitizing wideband signals. The high dynamic range allows the AFE76xx to generate and digitize 3G/4G signals for wireless base stations. In TDD mode, the receiver channel can be configured to dynamically switch between traffic receiver (TDD RX) status and wideband feedback receiver (TDD FB) status to assist DPD (Digital Pre-Distortion) of the Power Amplifier (PA) on the transmitter path.
The AFE76xx family has integrated DSA on the receiver channels and also supports DSA equivalent functionality on the transmitter channels. Each receiver channel has one analog RF peak power detector, various digital power detectors to assist AGC control for receiver channels, and two RF overload detectors for device reliability protection. The AFE76xx family has 8 of JESD204B compatible SerDes transceivers running up to 15Gbps. The devices have up to two DUCs per TX channel and two DDCs per RX channel, with multiple interpolation/decimation rates and digital quadrature modulators/demodulators with independent, frequency-flexible NCOs. The devices support more than 1000MHz (800MHz as 4T4R) RF signal bandwidth in single-band mode and up to 800MHz (300MHz as 4T4R) RF signal bandwidth per band in dual-band mode. A low-jitter PLL/VCO simplifies the sampling clock generation by allowing the use of a lower-frequency reference clock.
Features
- 14-Bit Resolution
- Sample rate
- DAC: 9GSPS
- ADC: 3GSPS
- RF Frequency range up to 5.2GHz
- Maximum RF signal bandwidth
- Quad-Channel Mode (4T4R) of 800MHz (single-band); 300MHz (dual-band)
- Dual-Channel Mode (2T2R) of 1200MHz (TX)/1000MHz (RX) (single-band); 800MHz (dual-band)
- On-chip dual selectable DSAs per RX channel
- Integrated TX DSA functionality
- Digital
- Dual Band Digital Up-Converters (DUCs)
- Dual Band Digital Down-Converters (DDCs)
- 32-Bit NCOs for DUCs/DDCs
- Interpolation ratio of 6x, 8x, 9x, 12x, 16x, 18x, 24x, 36x
- /2, /3, /4, /6, /8, /9, /12, /16, /18, /24, /32 Decimation ratio
- RX/FB Dynamic switching for TDD
- Interface
- 8 SerDes Transceivers up to 15Gbps
- 16-Bit and 12-Bit JESD204B Transport layer formatting with 8b/10b encoding
- Subclass 1 Multi-device synchronization
- Clock
- Internal PLL/VCO to generate DAC and ADC clocks
- 17mm x 17mm FC BGA, 0.8mm Pitch package
- 1.85V, 1.15V, 1.0V, –1.8V Power supplies
Applications
- Cellular base stations
- Wideband communications
- Microwave backhaul
- Distributed Antenna Systems (DAS)
Functional Block Diagram
