Datasheet AD8317 (Analog Devices)

1 MHz to 10 GHz, 55 dB Log Detector/Controller Data Sheet AD8317 FEATURES FUNCTIONAL BLOCK DIAGRAM VPOS TADJ Wide bandwidth: 1 MHz to 10 GHz High accuracy: ±1.0 dB over temperature GAIN 55 dB dynamic range up to 8 GHz ± 3 dB error BIAS SLOPE I V VSET Stability over temperature: ±0.5 dB Low noise measurement/controller output, VOUT I V VOUT Pulse response time: 6 ns/10 ns (fall/rise) DET DET DET DET Small footprint, 2 mm × 3 mm LFCSP CLPF INHI Supply operation: 3.0 V to 5.5 V at 22 mA INLO Fabricated using high speed SiGe process
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APPLICATIONS COMM
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RF transmitter PA setpoint control and level monitoring Power monitoring in radio link transmitters RSSI measurement in base stations, WLANs, WiMAX, and radars GENERAL DESCRIPTION
The AD8317 is a demodulating logarithmic amplifier, capable The feedback loop through an RF amplifier is closed via VOUT, of accurately converting an RF input signal to a corresponding the output of which regulates the output of the amplifier to a decibel-scaled output. It employs the progressive compression magnitude corresponding to VSET. The AD8317 provides 0 V to technique over a cascaded amplifier chain, each stage of which (VPOS − 0.1 V) output capability at the VOUT pin, suitable for is equipped with a detector cell. The device can be used in either controller applications. As a measurement device, VOUT is measurement or controller modes. The AD8317 maintains externally connected to VSET to produce an output voltage, accurate log conformance for signals of 1 MHz to 8 GHz and VOUT, that is a decreasing linear-in-dB function of the RF input provides useful operation to 10 GHz. The input dynamic range signal amplitude. is typically 55 dB (referenced to 50 Ω) with less than ±3 dB The logarithmic slope is 22 mV/dB, determined by the VSET error. The AD8317 has 6 ns/10 ns response time (fall time/rise interface. The intercept is 15 dBm (referenced to 50 Ω, CW time) that enables RF burst detection to a pulse rate of beyond input) using the INHI input. These parameters are very stable 50 MHz. The device provides unprecedented logarithmic intercept against supply and temperature variations. stability vs. ambient temperature conditions. A supply of 3.0 V to 5.5 V is required to power the device. Current consumption is The AD8317 is fabricated on a SiGe bipolar IC process and is typically 22 mA, and it decreases to 200 μA when the device is available in a 2 mm × 3 mm, 8-lead LFCSP with an operating disabled. temperature range of −40°C to +85°C. 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.
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION USING THE AD8317 BASIC CONNECTIONS INPUT SIGNAL COUPLING OUTPUT INTERFACE SETPOINT INTERFACE TEMPERATURE COMPENSATION OF OUTPUT VOLTAGE MEASUREMENT MODE SETTING THE OUTPUT SLOPE IN MEASUREMENT MODE CONTROLLER MODE OUTPUT FILTERING OPERATION BEYOND 8 GHz EVALUATION BOARD DIE INFORMATION OUTLINE DIMENSIONS ORDERING GUIDE