Datasheet AD8313 (Analog Devices)

0.1 GHz to 2.5 GHz 70 dB Logarithmic Detector/Control er Data Sheet AD8313 FEATURES FUNCTIONAL BLOCK DIAGRAM Wide bandwidth: 0.1 GHz to 2.5 GHz min NINE DETECTOR CELLS + + + + High dynamic range: 70 dB to ±3.0 dB + I
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V 8 VOUT High accuracy: ±1.0 dB over 65 dB range (@ 1.9 GHz) VPOS 1 Fast response: 40 ns full-scale typical CINT 2 Controller mode with error output INHI 8dB 8dB 8dB 8dB LP V
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I 7 VSET 3 Scaling stable over supply and temperature INLO EIGHT 8dB 3.5GHz AMPLIFIER STAGES Wide supply range: 2.7 V to 5.5 V Low power: 40 mW at 3 V INTERCEPT 6 COMM AD8313 CONTROL Power-down feature: 60 mW at 3 V Complete and easy to use VPOS 4 SLOPE BAND GAP GAIN 5 PWDN CONTROL REFERENCE BIAS APPLICATIONS
01085-C-001 Figure 1.
RF transmitter power amplifier setpoint control and level monitoring Logarithmic amplifier for RSSI measurement cellular base stations, radio link, radar GENERAL DESCRIPTION
The AD8313 is a complete multistage demodulating logarithmic
Table 1. Next Generation Upgrades for AD8313
amplifier that can accurately convert an RF signal at its input to
Part Number Comments
an equivalent decibel-scaled value at its dc output. The AD8313 ADL5513 Improved range and temperature stability, maintains a high degree of log conformance for signal frequencies operation up to 4 GHz from 0.1 GHz to 2.5 GHz. Application is straightforward, AD8318 Improved temperature stability, operation up requiring only a single supply of 2.7 V to 5.5 V and the addition to 8 GHz of a suitable input and supply decoupling. Operating on a 3 V AD8317 Lower input range, improved temperature supply, its 13.7 mA consumption (for T stability, operation up to 10 GHz A = 25°C) is only 41 mW. A power-down feature is provided; the input is taken high to AD8319 Lower input range, improved temperature initiate a low current (20 µA) sleep mode, with a threshold at stability, operation up to 10 GHz half the supply voltage.
2.0 5
The AD8313 is fabricated on Analog Devices, Inc., advanced
FREQUENCY = 1.9GHz 1.8 4
25 GHz silicon bipolar IC process and is available in an 8-lead
1.6 3
MSOP package. The operating temperature range is −40°C to +85°C.
1.4 2 1.2 1 1.0 0 0.8 –1 0.6 –2 OUTPUT ERROR (dB) OUTPUT VOLTAGE (V DC) 0.4 –3 0.2 –4 0 –5 –80 –70 –60 –50 –40 –30 –20 –10 0 INPUT AMPLITUDE (dBm)
01085-C-002 Figure 2. Typical Logarithmic Response and Error vs. Input Amplitude
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Document Outline Features Applications Functional Block Diagram General Description Table of Contents Revision History Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Description Typical Performance Characteristics Circuit Description Interfaces Power-Down Interface, PWDN Signal Inputs, INHI, INLO Logarithmic/Error Output, VOUT Setpoint Interface, VSET Applications Information Basic Connections for Log (RSSI) Mode Operating in Controller Mode Input Coupling Narrow-Band LC Matching Example at 100 MHz Adjusting the Log Slope Increasing Output Current Effect of Waveform Type on Intercept Evaluation Board Schematic and Layout General Operation Using the AD8009 Operational Amplifier Varying the Logarithmic Slope Operating in Controller Mode RF Burst Response Outline Dimensions Ordering Guide