AD8309 - ADI

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

AD8309
Manufacturer

ADI
ChipWorker Part#

CW389423033
Description

5MHz TO 500MHz, 100dB Demodulating Logarithmic Amplifier with Limiter Output
Documentation

Datasheet

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AD8309 Specifications

Attribute	Attribute Value

Part Number	AD8309
Manufacturer	ADI
ChipWorker Part#	CW389423033
Documentation	Datasheet
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Product Lifecycle Status	Active

Product Description

Product Details
The AD8309 is a 500 MHz detecting logarithmic amplifier, based on the successive detection technique. This "log amp" is useful for received signal strength indication (RSSI) and phase detection in cellular base stations, radar and other radio transceiver applications.
It provides a dynamic range of 100 dB with an accuracy of ±0.4 dB over the central 80 dB and operates up to 500 MHz. The logarithmic output is proportional to the logarithm of the input signal, providing a 0.4 V to 2.5 V DC signal over the 100 dB input range. A limiter output is also provided which amplifies the input signal by 100 dB, providing a stable limited output with a maximum of ±100 ps phase skew. This limiter output is useful for demodulating FSK and PSK modulated signals.
The AD8309 operates from a single 2.7 V to 5.5 V dc power supply, drawing 20 mA typical. It is supplied in a 16 pin plastic TSSOP package.
An evaluation board is available for this product and may be ordered using the following product number: AD8309-EVAL. Schematic and layout for this evaluation board is contained in the product datasheet.
### Features and Benefits
Complete Multistage Log-Limiting IF Amplifier
100 dB Dynamic Range:
–78 dBm to +22 dBm (Re 50 O)
Programmable Limiter Gain and Output Current
Differential Outputs to 10 mA,
2.4 V p-p
Overall Gain 100 dB, Bandwidth 500 MHz
Constant Phase (Typical 680 ps Delay Skew)
500 ns Power-Up Time, <1 mA Sleep Current
Stable RSSI Scaling Over Temperature and Supplies:
20 mV/dB Slope, –95 dBm Intercept
±0.4 dB RSSI Linearity up to 200 MHz
Single Supply of +2.7 V to +6.5 V at
16 mA Typical
Fully Differential Inputs,
RIN = 1kΩ, CIN = 2.5 pF

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