Datasheet AD8309 (Analog Devices) - 3

AD8309–SPECIFICATIONS (VS = +5 V, TA = +25
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C, unless otherwise noted) Parameter Conditions Min1 Typ Max1 Units
INPUT STAGE (Inputs INHI, INLO) Maximum Input2 Differential Drive, p-p ±3.5 ±4 V +9 dBV Equivalent Power in 50 Ω Terminated in 52.3 Ω +22 dBm Noise Floor Terminated 50 Ω Source 1.28 nV/√Hz Equivalent Power in 50 Ω 500 MHz Bandwidth –78 dBm Input Resistance From INHI to INLO 800 1000 1200 Ω Input Capacitance From INHI to INLO 2.5 pF DC Bias Voltage Either Input 1.725 V LIMITING AMPLIFIER (Outputs LMHI, LMLO) Usable Frequency Range 5 500 MHz At Limiter Output RLOAD = RLIM = 50 Ω to –10 dB Point 875 MHz Phase Variation at 100 MHz Over Input Range –60 dBm to +10 dBm ±3 Degrees Limiter Output Current Nominally 400 mV/RLIM 0 1 10 mA Versus Temperature –40°C ≤ TA ≤ +85°C –0.008 %/°C Input Range3 –78 +9 dBV Equivalent dBm –65 +22 dBm Maximum Output Voltage At Either LMHI or LMLO, wrt VPS2 1 1.25 V Rise/Fall Time (10%–90%) RLOAD ≤ 50 Ω, 40 Ω ≤ RLIM ≤ 400 Ω 0.4 ns LOGARITHMIC AMPLIFIER (Output VLOG) ±3 dB Error Dynamic Range From Noise Floor to Maximum Input 100 dB Transfer Slope 5 MHz ≤ f ≤ 200 MHz 18 20 22 mV/dB Over Temperature –40°C < TA < +85°C 17 20 23 mV/dB Intercept (Log Offset) 5 MHz ≤ f ≤ 200 MHz –116 –108 –100 dBV Equivalent dBm (re 50 Ω) –103 –95 –87 dBm Over Temperature –40°C ≤ TA ≤ +85°C –117 –108 –99 dBV Equivalent dBm (re 50 Ω) –104 –95 –86 dBm Temperature Sensitivity –0.009 dB/°C Linearity Error (Ripple) Input from –83 dBV (–70 dBm) to +7 dBV (+20 dBm) ±0.4 dB Output Voltage Input = –91 dBV (–78 dBm) VS = +5 V, +2.7 V 0.34 V Input = +9 dBV (+22 dBm) VS = +5 V 2.34 2.75 V Input = +9 dBV (+22 dBm) VS = +2.75 V 2.10 V Minimum Load Resistance, RL 40 50 Ω Maximum Sink Current To Ground 0.75 1.0 1.25 mA Output Resistance 0.3 Ω Small-Signal Bandwidth 3.5 MHz Output Settling Time to 1% Large Scale Input, +3 dBV (+16 dBm), R ≤ L ≥␣ 50 Ω, CL ␣ 100 pF 120 220 ns Rise/Fall Time (10%–90%) Large Scale Input, +3 dBV (+16 dBm), R ≤ L ≥␣ 50 Ω, CL ␣ 100 pF 67 100 ns POWER INTERFACES Supply Voltage, VPOS 2.7 5 6.5 V Quiescent Current Zero-Signal, LMDR Open 13 16 20 mA Over Temperature –40°C < TA < +85°C 11 16 23 mA Disable Current –40°C < TA < +85°C 0.01 4 µA Additional Bias for Limiter RLIM = 400 Ω (See Text) 1.4 1.6 mA Logic Level to Enable Power HI Condition, –40°C < TA < +85°C 1.8 VPOS V Input Current when HI 3 V at ENBL, –40°C < TA < +85°C 40 60 µA Logic Level to Disable Power LO Condition, –40°C < TA < +85°C –0.5 1 V NOTES 1Minimum and maximum specified limits on parameters that are guaranteed but not tested are six sigma values. 2The input level is specified in “dBV” since logarithmic amplifiers respond strictly to voltage, not power. 0 dBV corresponds to a sinusoidal single-frequency input of 1 V rms. A power level of 0 dBm (1 mW) in a 50 Ω termination corresponds to an input of 0.2236 V rms. Hence, the relationship between dBV and dBm is a fixed offset of +13 dBm in the special case of a 50 Ω termination. 3Due to the extremely high Gain Bandwidth Product of the AD8309, the output of either LMHI or LMLO will be unstable for levels below –78 dBV (–65 dBm, re 50 Ω). Specifications subject to change without notice. –2– REV. B