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ADL5304-EVALZ Datasheet(PDF) 1 Page - Analog Devices |
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ADL5304-EVALZ Datasheet(HTML) 1 Page - Analog Devices |
1 / 32 page High Speed, 200 dB Range, Logarithmic Converter Data Sheet ADL5304 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2011 Analog Devices, Inc. All rights reserved. FEATURES Optimized for very fast response at all input currents Overall bandwidth of >4 MHz for inputs >1 μA Bandwidth: 25 kHz at input of 1 nA and 350 kHz at 10 nA 10 decades of input range: 1 pA to 10 mA Law conformance: ±0.25 dB from 100 pA to 100 μA Log ratio or fixed-intercept operation Precision voltage references and reference current Adaptive photodiode (PD) bias for low dark current Programmable log slope and intercept Default log slope of 10 mV/dB at VLOG pin Single- or dual-supply operation APPLICATIONS High accuracy optical power measurement Wide range baseband log compression Versatile detector for high speed APC loops GENERAL DESCRIPTION The ADL5304 is a high speed logarithmic converter with fast response and low noise over a 200 dB (1 pA to 10 mA) measure- ment range. The ADL5304 provides a nominal logarithmic slope of 10 mV/dB (200 mV/decade); other values are easily configured. Logarithmic intercept can be programmed over a wide range with the internal 100 nA current source or externally for log ratio applications. The default intercept value of 3.162 fA places the midpoint of the measurement range of 100 nA at VLOG = 1.5 V. A single positive supply of 5 V is all that is required for operation over a specified 1 pA to 3 mA input range. Dual-supply operation extends the specified input current range to 10 mA. The ADL5304 accepts two current inputs to the logarithmic argument. The numerator input, INUM, flows in the collector of an NPN transistor, connected in a feedback path around a low offset JFET amplifier. The denominator current, IDEN, is treated in the same way, which allows for log ratio operation. The input summing nodes (INUM and IDEN) operate at a constant default voltage of 1.5 V. The VSM1 to VSM4 pins flank the INUM and IDEN inputs to provide a guard voltage to minimize leakage currents. Adaptive photodiode biasing is provided for optical measurements. A monitor current 1.1 times INUM is output at the IMON pin, and an external resistor, RMNTR, at 10 times the photodiode series resistance (RS) applies a voltage across the photodiode that 1st order keeps the internal PD junction at 0 V to minimize dark current. The VLOG output is buffered and can be rescaled through internal gain setting resistors. The internal ILOG varies from −400 μA to +400 μA as INUM changes over 10 decades from 1 pA to 10 mA. This corresponds to 0.5 V to 2.5 V at the VLOG pin in the default configuration shown in Figure 1. Accurate 1.5 V (Pin 1P5V) and 2.0 V (Pin 2VLT) reference outputs allow precise repositioning of the intercept using external resistors. The ADL5304 is available in a 32-lead, 5 mm × 5 mm LFCSP and specified for operation from −40°C to +85°C. SIMPLIFIED BLOCK DIAGRAM ADL5304 2 30 3 4 5 6 8 7 MONITOR AND PD BIAS (1.1× INUM) TEMPERATURE COMPENSATION 1.5V 1.5V 32 31 26 9 IMON VNUM INNM VDEN HFCP COMM NMFS VNEG DNFS VNEG INDN 1P5V 2VLT DCBI BSDC VSM1 VSM2 VSM3 IREF IDEN INUM VSM4 10 11 27 29 28 100nA 1.5V 17 24 2V BIAS AND VREF 12 13 14 ACOM 15 16 INPS INMS VLOG 23 22 5kΩ 5kΩ 1kΩ 1kΩ 7.5kΩ 21 20 19 18 SCL1 SCL2 SCL3 ACOM RMNTR VPOS VNUM VDEN ILOG Figure 1. |
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