AD8307 Datasheet | Analog Devices

FEATURES plete multistage logarithmic amplifier 92 d B dynamic range: - 75 d Bm to +17 d Bm to - 90 d Bm using matching network Single supply of 2.7 V minimum at 7.5 m A typical DC to 500 MHz operation, ±1 d B linearity Slope of 25 m V/d B, intercept of - 84 d Bm Highly stable scaling over temperature Fully differential dc-coupled signal path 100 ns power-up time, 150 μA sleep current APPLICATIONS Conversion of signal level to decibel form Transmitter antenna power measurement Receiver signal strength indication (RSSI) Low cost radar and sonar signal processing Network and spectrum analyzers (to 120 d B) Signal level determination down to 20 Hz True decibel ac mode for multimeters GENERAL DESCRIPTION The AD8307 is the first logarithmic amplifier made available in an 8-lead SOIC_N package. It is a plete 500 MHz monolithic demodulating logarithmic amplifier based on the progressive pression (successive detection) technique, providing a dynamic range of 92 d B to ±3 d B law conformance and 88 d B to a tight ±1 d B error bound at all frequencies up to 100 MHz. The AD8307 is extremely stable and easy to use, requiring no significant external ponents. A single-supply voltage of 2.7 V to 5.5 V at 7.5 m A is needed. A fast acting CMOSpatible control pin can disable the AD8307 to a standby current of 150 μA. The AD8307 operates over the industrial temperature range of - 40°C to +85°C and is available in an 8-lead SOIC package and an 8-lead PDIP. Low Cost, DC to 500 MHz, 92 d B Logarithmic Amplifier AD8307 FUNCTIONAL BLOCK DIAGRAM VPS 7 7.5m A BAND GAP REFERENCE AND BIASING 6 ENB +INP 8 INM 1 1.1kΩ - INP 3 SIX 14.3d B 900MHz AMPLIFIER STAGES NINE DETECTOR CELLS SPACED 14.3d B INPUT-OFFSET PENSATION LOOP 5 INT MIRROR 2µA /d B 2 4 OUT 12.5kΩ 3 OFS 01082-001 Figure 1. Table 1. Next Generation Upgrades for the AD8307 Device No. Product Description AD8310 15 ns Response Time, Buffered Output ADL5513 Lower Input Range (80 d B), Operation to 4 GHz, Higher Power...