AD8318 Logarithmic Detector 1 M-8 GHz 70 dB Dynamic Control ALC AGC

Features:1.Application to RF transmitters, PA transmitters, setpoint control, and RSSI level monitoring in base stations, WLAN, WiMAX, and radars
2.The AD8318 is a logarithmic demodulating amplifier capable of accurately converting an RF input signal into an output voltage on the corresponding decibel scale.
3.It uses a step-by-step compression technique on a cascaded amplifier chain, each stage of which is equipped with a detector cell.
4.The AD8318 can be configured to provide a control voltage to a VGA, such as a power amplifier or measurement output, from the Vout pin.
5.Small LFCSP footprint, integrated temperature sensor, manufactured using a high-speed SIGE process

Specifications:

Descriptions:
The AD8318 is a demodulated logarithmic amplifier, capable of accurately converting an RF input signal to a corresponding decibel scale output voltage. It uses the progressive compression technique on a chain of cascaded amplifiers, each stage of which is equipped with a detection cell. The device is used in measurement or controller mode. The AD8318 maintains precise logarithmic compliance for signals from 1 MHz to 6 GHz and provides useful operation at 8 GHz. The input range is typically 60 dB (RE: 50 Ω) with an error less than ±1 dB. The AD8318 has a 10ns response time which enables RF burst detection beyond 45MHz.The device provides logarithmic intercept stability unrelated to ambient temperature conditions. A 2 mV/°C slope temperature sensor output is also provided for additional system monitoring. Only one 5V supply is required. Current consumption is generally 68 mA. Power consumption decreases
The AD8318 can be configured to provide control voltage to a VGA, such as a power amplifier or measurement output, from the Vout pin. Since the output can be used for controller applications, wideband noise is minimal.
In this mode, the set point control voltage is applied to VSET. The feedback loop through an RF amplifier is closed via VOT, the output of which regulates the amplifier output to a magnitude corresponding to VSET.The AD8318 provides 0V to 4.9V output capability at the Vout pin, suitable for controller applications. As a measuring device, the Vout pin is externally connected to VSET to produce an output voltage, VOT, which is a decreasing linear function in DB of the amplitude of the RF input signal.
The logarithmic slope is nominally -25 mV/dB but can be adjusted by extending the feedback voltage from the VST to VSET interface. The intercept is 20 dBm (RE: 50 Ω, CW input) using the INHI input. These parameters are very stable compared to variations in power supply and temperature.
The AD8318 is manufactured on a SIGE bipolar process and is available in a 4mm x 4mm, 16 laad LFCSP for the operating temperature range of -40℃~85℃.
Features:
Applications include RF base stations, speech control, and level monitoring for WiMAX and radar signals.
The AD8318 is a logarithmic demodulated amplifier capable of accurately converting an RF input signal into a corresponding decibel-scale output voltage.
It utilizes progressive compression across a cascaded amplifier chain, with each stage equipped with a detection cell.
The AD8318 can be configured to provide a control voltage to a VGA, such as a power amplifier or measurement output, from the Vout pin.
Small LFCSP footprint, integrated temperature sensor, high-speed SIGE manufacturing process.
Specifications:
Frequency range: 1 MHz to 8 GHz
High sensitivity: ±1.0 dB over a 55 dB range (temperature stability: ±0.5 dB)
Low noise reduction
Pulse response time: 10 ns / 12 ns (fall/rise)
Power-down feature:
Single operation supply: 5 V @ 68 mA
Size: 35 * 37 mm / 0.38 * 1.46 inch
Package includes:
1 x AD8318 1M-8GHz 70dB