AFE7685 4TX/4RX RF-sampling transceiver with 14-bit 9-GSPS DAC and 3-GSPS ADC | TI.com

AFE7685
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4TX/4RX RF-sampling transceiver with 14-bit 9-GSPS DAC and 3-GSPS ADC

 

More information

See the full data sheet and other design resources for the commercial wireless-specific AFE7685. Request now

For all other applications, see our general-purpose RF-sampling AFEs.

Description

The AFE76xx is a family of high performance, quad/dual channel, 14-bit, integrated RF sampling analog front ends (AFEs) with 9 GSPS DACs and 3 GSPS ADCs, capable of synthesizing and digitizing wideband signals. 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 switching 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 and 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 15 Gbps. 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 1000 MHz (800 MHz as 4T4R) RF signal bandwidth in single-band mode, and up to 800 MHz (300 MHz as 4T4R) RF signal bandwidth per band in dual-band mode. A low jitter PLL/VCO simplifies the sampling clock generation by allowing use of a lower frequency reference clock.

Features

  • 14-Bit resolution
  • Sample rate:
    • DAC: 9GSPS
    • ADC: 3GSPS
  • RF Frequency range: up to 5.2 GHz
  • Maximum RF signal bandwidth
    • Quad-channel mode (4T4R): 800 MHz (single-band); 300 MHz (dual-band)
    • Dual-channel mode (2T2R): 1200 MHz (TX)/1000 MHz (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: 6x, 8x, 9x, 12x, 16x, 18x, 24x, 36x
    • Decimation ratio: /2, /3, /4, /6, /8, /9, /12, /16, /18, /24, /32
    • 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
  • Package: 17mm x 17mm FC BGA, 0.8mm pitch
  • Power supplies: 1.85 V, 1.15 V, 1.0 V, –1.8 V

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Parametrics

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Part number Order # of TX/RX # of DUCs/TX # of DDCs/RX Data rate (MSPS) Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Approx. price (US$)
AFE7685 Order now 4T4R     1     1     750     -40 to 85     FCBGA | 400     400FCBGA: 289 mm2: 17 x 17 (FCBGA | 400)     2245.50 | 1ku    
AFE7681 Samples not available 4T2R     1     1     750     -40 to 85     FCBGA | 400     400FCBGA: 289 mm2: 17 x 17 (FCBGA | 400)     2295.45 | 1ku    
AFE7683 Samples not available 2T4R     1     1     750     -40 to 85     FCBGA | 400     400FCBGA: 289 mm2: 17 x 17 (FCBGA | 400)     2020.95 | 1ku    
AFE7684 Samples not available 2T4R     2     2     1500     -40 to 85     FCBGA | 400     400FCBGA: 289 mm2: 17 x 17 (FCBGA | 400)     2295.40 | 1ku    
AFE7686 Samples not available 4T4R     2     2     1500     -40 to 85     FCBGA | 400     400FCBGA: 289 mm2: 17 x 17 (FCBGA | 400)     2495.01 | 100u    
AFE7700 Samples not available 4T4R2F         737     -40 to 85     FCBGA | 400     400FCBGA: 289 mm2: 17 x 17 (FCBGA | 400)     650.05 | 1ku    
AFE7769 Samples not available 4T4R2F         737     -40 to 85     FCBGA | 400     400FCBGA: 289 mm2: 17 x 17 (FCBGA | 400)     650.05 | 1ku    
AFE7799 Samples not available 4T4R2F         737     -40 to 85     FCBGA | 400     400FCBGA: 289 mm2: 17 x 17 (FCBGA | 400)     650.05 | 1ku