Product Summary
The AD8313ARMZ-REEL7 is a Logarithmic Detector/Controller. The AD8313ARMZ-REEL7 is a complete multistage demodulating logarithmic amplifier that can accurately convert an RF signal at its differ-ential input to an equivalent decibel-scaled value at its dc output. The AD8313ARMZ-REEL7 maintains a high degree of log conformance for signal frequencies from 0.1 GHz to 2.5 GHz and is useful over the range of 10 MHz to 3.5 GHz. The nominal input dynamic range is –65 dBm to 0 dBm (re: 50 Ω), and the sensitivity can be increased by 6 dB or more with a narrow-band input impedance matching network or a balun. Application is straightforward, requiring only a single supply of 2.7 V to 5.5 V and the addition of a suitable input and supply decoupling. Operating on a 3 V supply, its 13.7 mA consumption (for TA = 25℃) is only 41 mW. A power-down feature is provided; the input is taken high to initiate a low current (20 μA) sleep mode, with a threshold at half the supply voltage. The AD8313ARMZ-REEL7 uses a cascade of eight amplifier/limiter cells, each having a nominal gain of 8 dB bandwidth of 3.5 GHz. This produces a total midland gain of 64 dB. At each amplifier output, a detector (rectifier) cell is used to convert the RF signal to baseband form; a ninth detector cell is placed directly at the input of the AD8313ARMZ-REEL7. The current-mode outputs of these cells are summed to generate a piecewise linear approxi-mation to the logarithmic function. The applications of the AD8313ARMZ-REEL7 include RF transmitter power amplifier setpoint control and level monitoring, Logarithmic amplifier for RSSI measurement cellular base stations, radio link, radar.
Parametrics
AD8313ARMZ-REEL7 absolute maximum ratings: (1)Supply Voltage VS: 5.5 V; (2)VOUT, VSET, PWDN: 0 V, VPOS; (3)Input Power Differential (re: 50 Ω, 5.5 V): 25 dBm; (4)Input Power Single-Ended (re: 50 Ω, 5.5 V): 19 dBm; (5)Internal Power Dissipation: 200 mW; (6)θJA: 200℃/W; (7)Maximum Junction Temperature: 125℃; (8)Operating Temperature Range: –40℃ to +85℃; (9)Storage Temperature Range: –65℃ to +150℃.
Features
AD8313ARMZ-REEL7 features: (1)Wide bandwidth: 0.1 GHz to 2.5 GHz min; (2)High dynamic range: 70 dB to ±3.0 dB; (3)High accuracy: ±1.0 dB over 65 dB range (@ 1.9 GHz); (4)Fast response: 40 ns full-scale typical; (5)Controller mode with error output; (6)Scaling stable over supply and temperature; (7)Wide supply range: 2.7 V to 5.5 V; (8)Low power: 40 mW at 3 V; (9)Power-down feature: 60 mW at 3 V; (10)Complete and easy to use.
Diagrams
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AD8313ARMZ-REEL7 |
IC LOG DETECTOR/CTRLR 8-MSOP TR |
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