Analog Devices: CN0150A Reference Design for Software Calibrated, 1 MHz to 8 GHz, 60 dB RF Power Measurement System Using the AD8318 Logarithmic Detector

atomar — Tue, 23 Apr 2013 07:34:34 GMT

Current Revision posted to Documents by atomar on 4/23/2013 7:34:34 AM

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Development Tools

Kit Overview

This EVAL-CN0150A-SDPZEVAL-CN0150A-SDPZ circuit measures RF power at any frequency from 1 MHz to 8 GHz over a range of approximately 60 dB. The measurement result is provided as a digital code at the output of a 12-bit ADC with serial interface and integrated reference. The output of the RF detector has a glueless interface to the ADC and uses most of the ADC’s input range without further adjustment. A simple two-point system calibration is performed in the digital domain.

The AD8318AD8318 maintains accurate log conformance for signals of 1 MHz to 6 GHz and provides useful operation to 8 GHz. The device provides a typical output voltage temperature stability of ±0.5 dB.

The AD7887AD7887 ADC can be configured for either dual or single channel operation via the on-chip control register. There is a default single-channel mode that allows the AD7887 to be operated as a read-only ADC, thereby simplifying the control logic.

This circuit uses the EVAL-CN0150A-SDPZEVAL-CN0150A-SDPZ circuit board and the EVAL-SDP-CB1ZEVAL-SDP-CB1Z System Demonstration Platform (SDP-B) evaluation board. The two boards have 120-pin mating connectors, allowing for the quick setup and evaluation of the circuit’s performance. The EVAL-CN0150A-SDPZ board contains the circuit to be evaluated, and the SDP evaluation board is used with the CN0150A evaluation software to capture the data from the EVAL-CN0150A-SDPZ circuit board.

Key Applications: Communications, Radar

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Development Tools

PC with a USB port and Windows® XP or Windows Vista® (32-bit), or Windows® 7 (32-bit)
EVAL-CN0150A-SDPZEVAL-CN0150A-SDPZ Circuit Evaluation Board
EVAL-SDP-CB1ZEVAL-SDP-CB1Z SDP Evaluation Board

- Blackfin Processor ADSP-BF527
- USB 2.0 Interface to PC
- JTAG header footprint
- 32MB SDRAM
- 2 x Small Footprint 120 Pin Connectors
- Configurable Peripheral Interfaces - SPI - SPORT - I2C - GPIOs - Parallel - Timers

CN0150A Evaluation Software
Power supply: +6 V, or +6 V “wall wart”
Environmental chamber
RF signal source
Coaxial RF cable with SMA connectors

Technical Documents

Learning Center

Type	Description
User Guide	ADI: User Guide (CN-0150) for Software Calibrated, 1 MHz to 8 GHz, 70 dB RF Power Measurement System Using the AD8318 Logarithmic Detector
User Guide	ADI: User Guide for EVAL-SDP-CB1Z
Datasheet	ADI: Datasheet for AD8318 1 MHz to 8 GHz, 70 dB Logarithmic Detector/Controller (Rev B)
Datasheet	ADI: Datasheet for ADR420/ADR421/ADR423/ADR425 Ultraprecision, Low Noise, 2.048 V/2.500 V/3.00 V/5.00 V XFET Voltage References (Rev I)
Datasheet	ADI: Datasheet for AD7887: 2.7 V to 5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead MSOP Data Sheet (Rev D)
Application Note	ADI: Application Note (AN-1040) for RF Power Calibration Improves Performance of Wireless Transmitters
Application Note	ADI: Application Note (AN-713) for Effect of Long-Term Drift on Voltage References

Design Elements

Type	Description
Schematics	ADI: Schematics for EVAL-CN0150A-SDPZ Evaluation Board
Layout	ADI: Layout File for EVAL-CN0150A-SDPZ
Layout	ADI: Layout File for AD8318
BOM	ADI: BOM File for EVAL-CN0150A-SDPZ Evaluation Board
Reference Design	ADI: Reference Design for EVAL-CN0150A-SDPZ
Application Library	ADI: Application Library for BeMicro FPGA Project (CN0150) with Nios driver

Video

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Kit Features

Key Features for EVAL-CN0150A-SDPZEVAL-CN0150A-SDPZ Evaluation Board are as below:

Measures RF power at any frequency from 1 MHz to 8 GHz over a range of approximately 60 dB
Result is provided as a digital code at the output of a 12-bit ADC with serial interface and integrated reference
The AD8318 maintains accurate log conformance for signals of 1 MHz to 6 GHz and provides useful operation to 8 GHz
- The device provides a typical output voltage temperature stability of ±0.5 dB.
- Features for AD8318AD8318:
  - Wide bandwidth: 1 MHz to 8 GHz
  - High accuracy: ±1.0 dB over 55 dB range (f < 5.8 GHz)
  - Stability over temperature: ±0.5 dB
  - Low noise measurement/controller output (VOUT)
  - Pulse response time: 10 ns/12 ns (fall/rise)
  - Integrated temperature sensor
The AD7887 ADC can be configured for either dual or single channel operation via the on-chip control register.
- Features for AD7887AD7887:
  - Specified for V_DD of 2.7 V to 5.25 V
  - Flexible power/throughput rate management
  - Shutdown mode: 1 μA max
  - One or two single-ended inputs
  - Serial interface: SPI®/QSPI™/MICROWIRE™/DSP compatible

Kit Contents

The Analog Devices EVAL-CN0150A-SDPZEVAL-CN0150A-SDPZ kit is supplied with below contents:

Evaluation Board

Tags: ad8318, eval-cn0150a-sdpz, ad7887, analog_devices