ADR421ARM

更新时间： 2024-01-04 10:13:20

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ADR421ARM 数据手册

Circuit Note

CN-0150

Devices Connected/Referenced

1 MHz to 8 GHz, 70 dB, Logarithmic

Detector/Controller

Circuits from the Lab™ reference circuits are engineered and

tested for quick and easy system integration to help solve today’s

analog, mixed-signal, and RF design challenges. For more

information and/or support, visit www.analog.com/CN0150.

AD8318

2.7 V to 5.25 V, Micropower, 2-Channel,

125 kSPS, 12-Bit ADC in 8-Lead MSOP

AD7887

ADR421

Precision, Low Noise, 2.5 V Reference

Software-Calibrated, 1 MHz to 8 GHz, 60 dB RF Power

Measurement System Using a Logarithmic Detector

A simple two-point system calibration is performed in the

digital domain.

EVALUATION AND DESIGN SUPPORT

Circuit Evaluation Boards

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.ꢀ dB.

CN-0150 Circuit Evaluation Board (EVAL-CN0150A-SDPZ)

System Demonstration Platform (EVAL-SDP-CB1Z)

Design and Integration Files

Schematics, Layout Files, Bill of Materials

The AD7887 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.

CIRCUIT FUNCTION AND BENEFITS

This 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.

Typical data is shown for the two devices operating over a

−40°C to +8ꢀ°C temperature range.

+5V

POS

499Ω

0.1µF

10µF

0.1µF

100pF

SERIAL

INTERFACE

CMIP CMIP TADJ VPSO

13 TEMP

CMOP

VSET

VOUT

CLPF

AD7887

PULSED RF

INPUT

OUT

C1 1nF

C2 1nF

AIN0

14 INHI

SCLK

52.3Ω

AD8318

µC/µP

FIN

SEE

TEXT

DOUT

DIN

15 INLO

16 ENBL

AIN1/

REF

0.1µF

CMIP CMIP VPSI VPSI

GND

0.1µF

100pF

0.1µF

POS

Figure 1. Software-Calibrated RF Measurement System (Simplified Schematic: All Connections Not Shown)

Rev. C

Circuits from the Lab™ circuits from Analog Devices have been designed and built by Analog Devices

engineers. Standard engineering practices have been employed in the design and construction of

each circuit, and their function and performance have been tested and verified in a lab environment at

room temperature. However, you are solely responsible for testing the circuit and determining its

suitability and applicability for your use and application. Accordingly, in no event shall Analog Devices

be liable for direct, indirect, special, incidental, consequential or punitive damages due to any cause

whatsoever connected totheuseof anyCircuits from the Lab circuits. (Continued on last page)

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

12 3 4 5

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ADR421ARM 替代型号

型号	品牌	替代类型	描述	数据表
ADR421ARM-REEL7	ADI	类似代替	Ultraprecision Low Noise, 2.048 V/2.500 V/ 3.00 V/5.00 V XFET Voltage References
ADR421ARMZ-REEL7	ADI	功能相似	Ultraprecision, Low Noise, 2.048 V/2.500 V/ 3
ADR421ARMZ	ADI	功能相似	Ultraprecision, Low Noise, 2.048 V/2.500 V/ 3

与ADR421ARM相关器件

型号	品牌	获取价格	描述	数据表
ADR421ARM-REEL7	ADI	获取价格	Ultraprecision Low Noise, 2.048 V/2.500 V/ 3.00 V/5.00 V XFET Voltage References
ADR421ARMZ	ADI	获取价格	Ultraprecision, Low Noise, 2.048 V/2.500 V/ 3
ADR421ARMZ-REEL7	ADI	获取价格	Ultraprecision, Low Noise, 2.048 V/2.500 V/ 3
ADR421AR-REEL7	ADI	获取价格	Ultraprecision Low Noise, 2.048 V/2.500 V/ 3.00 V/5.00 V XFET Voltage References
ADR421ARZ	ADI	获取价格	Ultraprecision, Low Noise, 2.048 V/2.500 V/ 3
ADR421ARZ-REEL7	ADI	获取价格	Ultraprecision, Low Noise, 2.048 V/2.500 V/ 3
ADR421BR	ADI	获取价格	Ultraprecision Low Noise, 2.048 V/2.500 V/ 3.00 V/5.00 V XFET Voltage References
ADR421BR-REEL7	ADI	获取价格	Ultraprecision Low Noise, 2.048 V/2.500 V/ 3.00 V/5.00 V XFET Voltage References
ADR421BRZ	ADI	获取价格	Ultraprecision, Low Noise, 2.048 V/2.500 V/ 3
ADR421BRZ-REEL7	ADI	获取价格	Ultraprecision, Low Noise, 2.048 V/2.500 V/ 3

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