Analog Devices Inc. ADAR4002 0.5GHz to 19GHz True TDU
Analog Devices ADAR4002 0.5GHz to 19GHz True Time Delay Unit (TDU) is a low-power, broadband, bidirectional, single-channel true TDU and a digital step attenuator (DSA). The IC has 18.5GHz of bandwidth over a frequency range of 0.5GHz to 19GHz with a 50Ω 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 508ps with a resolution of 4ps (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 254ps and a resolution of 2ps (typical). This range has lower insertion loss compared to Range 0. It is beneficial at higher frequencies, where the ADAR4002 exhibits higher insertion loss and shorter time delay, and finer resolution is required. The DSA has 6-bit resolution with an attenuation range of 0dB to 31.5dB and a step size of 0.5dB.
The Analog Devices ADAR4002 is designed to provide flexible digital control through either a shift register or a serial port interface (SPI), allowing for daisy-chaining multiple chips together. The ADAR4002 contains register memory for 32 TDU and DSA states. The memory, combined with on-chip sequencers, enables fast bidirectional memory access via the UPDATE pin. The ADAR4002 is available in a 14-lead, 2mm x 3mm LFCSP and is specified to operate over the temperature range of -40°C to +85°C.
Features
- 0.5GHz to 19GHz frequency range
- Programmable 7-bit time delay
- Performance at 10GHz for minimum time delay and attenuation
- Insertion loss
- Time delay range 0: -20.5dB
- Time delay range 1: -16.2dB
- Input IP3
- Time delay range 0: 15.2dBm
- Time delay range 1: 14.1dBm
- Input P1dB
- Time delay range 0: 5dBm
- Time delay range 1: 4.1dBm
- Noise figure
- Time delay range 0: 21.2dB
- Time delay range 1: 16.6dB
- Insertion loss
- Programmable time delay range (typ.)
- Range 0: 0ps to 508ps with 4ps standard resolution
- Range 1: 0ps to 254ps with 2ps high resolution
- Programmable 6-bit attenuation
- 31.5dB adjustment range
- 0.5dB resolution
- Fully programmable via a 3-wire or 4-wire SPI
- 14-bit shift register for daisy chaining and quick data load
- 1mW with 1.2V and 1.0V dual supplies power dissipation
- 14-lead, 3mm × 2mm, LFCSP package
Applications
- Electronic steerable antenna arrays
- Multi-function arrays
- Satellite communications (SATCOM)
- RADAR
- Data links
- Test equipment
Functional Block Diagram
Development Tool
Analog Devices Inc. ADAR4002-EVALZ Evaluation Board
This board enables users to test all the functions and features offered by the ADAR4002 chip.