Texas Instruments AFE80xx RF Sampling Transceivers
Texas Instruments AFE80xx RF Sampling Transceivers are high-performance, wide-bandwidth multi-channel transceivers integrating up to eight RF sampling DACs and ten RF sampling ADCs. Pin and programming-compatible lower channel count versions (AFE8004 with 4TX and 4RX channels, AFE8010 with 10RX channels) allow scalable system designs.
Each receiver (RX) chain includes a 25dB range DSA (Digital Step Attenuator) followed by a 4GSPS ADC (analog-to-digital converter). The ten ADCs are connected to eight receiver paths (1RX though 8RX) and two feedback paths (1FB and 2FB). The ADCs are identical between RX and FB, but the digital down converter paths are different (the FB paths are capable of wider bandwidth and can be used as receivers). Each receiver channel has analog peak and power detectors, digital peak and power detectors to assist an external or internal autonomous automatic gain controller, and RF overload detectors for device reliability protection. The single or dual digital down converters (DDC) provide up to 800MHz of signal BW for eight channels or 400MHz for eight channels in addition to 800MHz for two channels.
Each transmitter (TX) chain includes a single or dual digital up converter (DUC), supporting up to 800MHz signal bandwidth for eight channels or 1200MHz for four channels. The output of the DUCs drives a 12GSPS DAC (digital-to-analog converter) with a mixed-mode output option to enhance the 2nd Nyquist operation. The DAC output of the Texas Instruments AFE80xx includes a variable gain amplifier (TX DSA) with a 40dB range and 1dB analog and 0.125dB digital steps.
Features
- AFE80xx versions
- AFE8000: 8 TX, 10 RX
- AFE8004: 4 TX, 4 RX
- AFE8010: 10 RX
- 12GSPS RF Sampling DACs
- 4GSPS RF Sampling ADCs
- Maximum RF signal bandwidth
- TX: 800MHz (8-ch) or 1.2GHz (4-ch)
- RX: 800MHz (8-ch) or 400MHz (8-ch) + 800MHz (2-ch)
- RF frequency range
- TX: 5MHz to 7.125GHz
- RX: 100MHz to 7.125GHz
- Digital Step Attenuators (DSA)
- TX: 40dB range, 1dB analog and 0.125dB digital steps
- RX/FB: 25dB range, 1dB step
- Single or dual-band DUC, DDCs
- Dual NCOs per chain for fast frequency switching
- Supports TDD operation with fast switching between TX and RX
- Internal PLL/VCO to generate DAC/ADC clocks
- Optional external CLK at DAC or ADC rate
- SerDes data interface
- JESD204B and JESD204C
- Eight SerDes transceivers up to 32.5Gbps
- 8b, 10b and 64b, 66b Encoding
- 12-bit, 16-bit, 24-bit and 32-bit resolution
- Subclass 1 multi-device synchronization
- 17mm × 17mm FCBGA, 0.8mm pitch package
Applications
- Radar
- Seeker front end
- Defense radio
- Tactical communications infrastructure
- Wireless communications test
Functional Block Diagram
