Analog Devices ADAR4002 Product Info

The ADAR4002 is a low power broadband, bidirectional, single- channel, true time delay unit (TDU) and a digital step attenuator (DSA). The IC has 18.5 GHz of bandwidth over a frequency range of 0.5 GHz to 19 GHz with 50 Ω input impedance at both RF ports. The TDU has two programmable maximum time delays, each with 7-bit control. Range 0 has a maximum delay of 508 ps with a resolution of 4 ps (typical). This range is used at lower frequencies where the ADAR4002 has less insertion loss and where more time delay is required for full 360° phase coverage. Range 1 has a maximum delay of 254 ps and a resolution of 2 ps (typical). This range has less insertion loss compared to Range 0 and is useful at higher frequencies where the ADAR4002 has higher insertion loss, and where less time delay and smaller resolution are required. The DSA has 6-bit resolution with an attenuation range of 0 dB to 31.5 dB and a step size of 0.5 dB.

The ADAR4002 is designed to provide flexible digital control through either a serial port interface (SPI) or a shift register to allow daisy chaining multiple chips together. The ADAR4002 contains register memory for 32 TDU and DSA states. The memory combined with on-chip sequencers, allows a fast bidirectional memory advance via the UPDATE pin.

The ADAR4002 is available in a 14-lead, 2 mm x 3 mm, LFCSP and is specified from −40°C to +85°C.

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