0.5 GHz to 19 GHz, 1-Channel, Bidirectional True Time Delay Unit

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.

APPLICATIONS

* Electronic steerable antenna arrays

* Multi-Function Arrays

* Satellite communications (SATCOM)

* RADAR

* Data Links

* Test Equipment

* 0.5 GHz to 19 GHz frequency range* Programmable 7-bit time delay* Programmable Time Delay Range (typical) * Range 0: 0 ps to 508 ps with 4 ps standard resolution

* Range 1: 0 ps to 254 ps with 2 ps high resolution * Programmable6-bit attenuation * 31.5 dB adjustment range* 0.5 dB resolution * Performance at 10 GHz for minimum time delay and attenuation

* Insertion loss

* Time Delay Range 0: −20.5 dB

* Time Delay Range 1: −16.2 dB

* Input IP3

* Time Delay Range 0: 15.2 dBm

* Time Delay Range 1: 14.1 dBm