Datasheet AD8362 (Analog Devices) - 9

AD8362 Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS COMM 1 16 ACOM CHPF 2 15 VREF DECL 3 14 VTGT AD8362 INHI 4 TOP VIEW 13 VPOS (Not to Scale) INLO 5 12 VOUT DECL 6 11 VSET PWDN 7 10 ACOM COMM 8 9 CLPF
02 0 3- 92 02 Figure 2. Pin Configuration
Table 4. Pin Function Descriptions Pin Equivalent No. Mnemonic Description Circuit
1, 8 COMM Common Connection. Connect via low impedance to system common. 2 CHPF Input HPF. Connect to common via a capacitor to determine 3 dB point of input signal high-pass filter. 3, 6 DECL Decoupling Terminals for INHI and INLO. Connect to common via a large capacitance to complete input circuit. 4, 5 INHI, INLO Differential Signal Input Terminals. Input Impedance = 200 Ω. Can also be driven single-ended, in Circuit A which case, the input impedance reduces to 100 Ω. 7 PWDN Disable/Enable Control Input. Apply logic high voltage to shut down the AD8362. 9 CLPF Connection for Ground Referenced Loop Filter Integration (Averaging) Capacitor. 10, 16 ACOM Analog Common Connection for Output Amplifier. 11 VSET Setpoint Input. Connect directly to VOUT for measurement mode. Apply setpoint input to this pin for Circuit B controller mode. 12 VOUT RMS Output. In measurement mode, VOUT is normally connected directly to VSET. Circuit C 13 VPOS Connect to 5 V Power Supply. 14 VTGT The logarithmic intercept voltage is proportional to the voltage applied to this pin. The use of a lower Circuit D target voltage increases the crest factor capacity. Normally connected to VREF. 15 VREF General-Purpose Reference Voltage Output of 1.25 V. Usually connected only to VTGT. Circuit E Rev. F | Page 8 of 33 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS EQUIVALENT CIRCUITS TYPICAL PERFORMANCE CHARACTERISTICS CHARACTERIZATION SETUP EQUIPMENT ANALYSIS CIRCUIT DESCRIPTION SQUARE LAW DETECTION VOLTAGE vs. POWER CALIBRATION OFFSET ELIMINATION TIME-DOMAIN RESPONSE OF THE CLOSED LOOP OPERATION IN RF MEASUREMENT MODE BASIC CONNECTIONS DEVICE DISABLE RECOMMENDED INPUT COUPLING Choosing Input Coupling Capacitors Single-Ended Input Drive OPERATION AT LOW FREQUENCIES CHOOSING A VALUE FOR CHPF CHOOSING A VALUE FOR CLPF ADJUSTING VTGT TO ACCOMMODATE SIGNALS WITH VERY HIGH CREST FACTORS ALTERING THE SLOPE TEMPERATURE COMPENSATION AND REDUCTION OF TRANSFER FUNCTION RIPPLE TEMPERATURE COMPENSATION AT VARIOUS WiMAX FREQUENCIES UP TO 3.8 GHz OPERATION IN CONTROLLER MODE RMS VOLTMETER WITH 90 dB DYNAMIC RANGE AD8362 EVALUATION BOARD OUTLINE DIMENSIONS ORDERING GUIDE