AD8317 - ADI

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

Part No

AD8317
Manufacturer

ADI
ChipWorker Part#

CW162517721
RoHS

Lead free / RoHS Compliant
Description

1MHz to 10GHz, 55dB Log Detector/Controller
Documentation

Datasheet

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AD8317 Specifications

Attribute	Attribute Value

Part Number	AD8317
Manufacturer	ADI
ChipWorker Part#	CW162517721
Documentation	Datasheet
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Product Lifecycle Status	Active
RoHS	RoHS Compliant

Product Description

Product Details
The AD8317 is a demodulating logarithmic amplifier, capable of accurately converting an RF input signal to a corresponding decibel-scaled output. It employs the progressive compression technique over a cascaded amplifier chain, each stage of which is equipped with a detector cell. The device can be used in either measurement or controller modes. The AD8317 maintains accurate log conformance for signals of 1 MHz to 8 GHz and provides useful operation to 10 GHz. The input dynamic range is typically 50 dB (re: 50 Ω) with error less than ±1 dB. The AD8317 has 8 ns/10 ns response time (fall time/rise time) that enables RF burst detection to a pulse rate of beyond 50 MHz. The device provides unprecedented logarithmic intercept stability vs. ambient temperature conditions. A supply of 3.0 V to 5.5 V is required to power the device. Current consumption is typically 22 mA, and it decreases to 200 μA when the device is disabled.
The AD8317 can be configured to provide a control voltage to a power amplifier or a measurement output from the VOUT pin. Because the output can be used for controller applications, special attention has been paid to minimize wideband noise. In this mode, the setpoint control voltage is applied to the VSET pin.
The feedback loop through an RF amplifier is closed via VOUT, the output of which regulates the output of the amplifier to a magnitude corresponding to VSET. The AD8317 provides 0 V to (VPOS − 0.1 V) output capability at the VOUT pin, suitable for controller applications. As a measurement device, VOUT is externally connected to VSET to produce an output voltage VOUT that is a decreasing linear-in-dB function of the RF input signal amplitude.
The logarithmic slope is −22 mV/dB, determined by the VSET interface. The intercept is 15 dBm (re: 50 Ω, CW input) using the INHI input. These parameters are very stable against supply and temperature variations.
The AD8317 is fabricated on a SiGe bipolar IC process and is available in a 2 mm × 3 mm, 8-lead LFCSP with an operating temperature range of −40°C to +85°C.
**Applications**
* RF transmitter PA setpoint control and level monitoring
* Power monitoring in radiolink transmitters
* RSSI measurement in base stations, WLANs, WiMAX, and radars
### Features and Benefits
Wide bandwidth: 1 MHz to 10 GHz
High accuracy: ±1.0 dB over temperature
50 dB dynamic range up to 8 GHz
Stability over temperature: ±0.5 dB
Low noise measurement/controller output VOUT
Pulse response time: 8 ns/10 ns (fall/rise)
Small footprint, 2 mm × 3 mm LFCSP
Supply operation: 3.0 V to 5.5 V @ 22 mA
Fabricated using high speed SiGe process

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