ad fmcomms1
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Analog Devices
FMCOMMS1-EBZ
WINLAB Rutgers University
Date : April 22, 2013
Authors :
Prasanthi Maddala, [email protected]
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Key Features
Software tunable across wide frequency range (400MHz to 4GHz)
125MHz channel bandwidth (250MSPS ADC, 1GSPS (1230MSPS) DAC)
RF section bypass for baseband sampling
Phase and frequency synchronization on both transmit and receive paths
Supports MIMO radio, with less than 1 sample sync on both ADC and DAC
Common I2C access for all device registers
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Block Diagram
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Transmit Path Key Components
- AD9122 Dual, 16-Bit, 1200 MSPS, TxDAC+ Digital-to-Analog Converter with
offset, phase and gain compensation.
- ADL5375 400 MHz to 6 GHz Broadband Quadrature Modulator.
- ADF4351 Wideband Synthesizer with Integrated VCO (35MHz to 4400MHz).
- ADL5602 50 MHz to 4.0 GHz RF/IF Gain (20dB) Block.
FPGA Interface
- dac_data_out[15:0] : interleaved I/Q data from the FPGA to the DAC
- dac_clk_out : DCI input to the DAC, reference bit used to generated DDR clock for
data sampling in the DAC. I DAC data should correspond to DCI high and Q DAC
data to DCI low.
- dac_frame_out : used for DAC FIFO reset
- dac_clk_in : clk input to the FPGA (comes from AD9523). This clock is used to send
data out to the DAC and to generate dac_clk_out (same rate).
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Clocking Key Components
- AD9548 Quad/Octal Input Network Clock Generator/Synchronizer (1Hz to 750MHz)
- AD9523-1 Low Jitter Clock Generator (1MHz to 1GHz) with 14 Outputs.
FPGA Interface/Inputs
- ref_clk_out : reference clock from the FPGA to AD9548.
- crystal oscillators : 19.2MHz oscillator connected to AD9548
50 122.88MHz VC oscillator connected to AD9523
Clocking in the default reference design
- ref_clk_out = 30MHz. This is cleaned up (from a jitter standpoint) and sent to
AD9523
- AD9523 takes this, and creates
491.52 MHz for the DAC sample rate
245.76 MHz for the ADC sample rate
122.88 MHz for the reference clocks for the LO PLLs.
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Receive Path
Key Components
- ADL5380 400 to 6000 MHz Quadrature Demodulator, 500MHz bandwidth.
- AD8366 DC to 600 MHz, Dual-Digital Variable Gain ( 4.5dB to 20.5dB) Amplifiers.
- AD9643 14-Bit, 250 MSPS, Dual Analog-to-Digital Converter (ADC).
- ADF4351 Wideband Synthesizer with Integrated VCO (35MHz to 4400MHz).
FPGA Interface
- adc_data_in[13:0] : 14 bit interleaved I/Q samples from ADC to the FPGA
- adc_clk_in : clock from ADC to FPGA in sync with the data
- adc_or_in : overrange at the ADC input is indicated by this bit (with some latency)
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Receive Bandwidth
ADL5380 baseband response shows the 3dB point at 300MHz.
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Reference Design