Datasheet AD8325 (Analog Devices) - 2

AD8325–SPECIFICATIONS (TA = 25
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C, VS = 5 V, RL = 75
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, VIN (differential) = 31 dBmV, VOUT measured through a 1:1 transformer1 with an insertion loss of 0.5 dB @ 10 MHz unless otherwise noted.) Parameter Conditions Min Typ Max Unit
INPUT CHARACTERISTICS Specified AC Voltage Output = 61 dBmV, Max Gain 31 dBmV Noise Figure Max Gain, f = 10 MHz 13.8 dB Input Resistance Single-Ended Input 800 W Differential Input 1600 W Input Capacitance 2 pF GAIN CONTROL INTERFACE Gain Range 58.45 59.45 60.45 dB Maximum Gain Gain Code = 79 Dec 29.2 30.0 30.8 dB Minimum Gain Gain Code = 0 Dec –30.25 –29.45 –28.65 dB Gain Scaling Factor 0.7526 dB/LSB OUTPUT CHARACTERISTICS Bandwidth (–3 dB) All Gain Codes 100 MHz Bandwidth Roll-Off f = 65 MHz 1.6 dB Bandwidth Peaking f = 65 MHz 0 dB Output Noise Spectral Density Max Gain, f = 10 MHz –33 dBmV in 160 kHz Min Gain, f = 10 MHz –48 dBmV in 160 kHz Transmit Disable Mode, f = 10 MHz –68 dBmV in 160 kHz 1 dB Compression Point Max Gain, f = 10 MHz 18.5 dBm Differential Output Impedance Transmit Enable and Transmit Disable Modes 75 ± 20% W OVERALL PERFORMANCE Second Order Harmonic Distortion f = 21 MHz, VOUT = 61 dBmV @ Max Gain –70 dBc f = 42 MHz, VOUT = 61 dBmV @ Max Gain –67 dBc f = 65 MHz, VOUT = 61 dBmV @ Max Gain –60 dBc Third Order Harmonic Distortion f = 21 MHz, VOUT = 61 dBmV @ Max Gain –57 dBc f = 42 MHz, VOUT = 61 dBmV @ Max Gain –55 dBc f = 65 MHz, VOUT = 61 dBmV @ Max Gain –54 dBc Adjacent Channel Power Adjacent Channel Width = Transmit Channel –53.8 dBc Width = 160 KSYM/SEC Gain Linearity Error f = 10 MHz, Code to Code ±0.3 dB Output Settling Due to Gain Change (TGS) Min to Max Gain 60 ns Due to Input Change Max Gain, VIN = 31 dBmV 30 ns Isolation in Transmit Disable Mode Max Gain, TXEN = 0 V, f = 42 MHz, –33 dBc VIN = 31 dBmV POWER CONTROL Transmit Enable Settling Time (TON) Max Gain, VIN = 0 V 300 ns Transmit Disable Settling Time (TOFF) Max Gain, VIN = 0 V 40 ns Between Burst Transients2 Equivalent Output = 31 dBmV 3 mV p-p Equivalent Output = 61 dBmV 50 mV p-p POWER SUPPLY Operating Range 4.75 5 5.25 V Quiescent Current Transmit Enable Mode (TXEN = 1) 123 133 140 mA Transmit Disable Mode (TXEN = 0) 30 35 10 mA Sleep Mode 2 4 7 mA OPERATING TEMPERATURE –40 +85 ∞C RANGE NOTES 1TOKO 617DB-A0070 used for above specifications. MACOM ETC-1-IT-15 can be substituted. 2Between Burst Transients measured at the output of a 42 MHz diplexer. Specifications subject to change without notice. –2– REV. A Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS LOGIC INPUTS TIMING REQUIREMENTS ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDERING GUIDE PIN FUNCTION DESCRIPTIONS Typical Performance Characteristics APPLICATIONS General Application Operational Description SPI Programming and Gain Adjustment Input Bias, Impedance, and Termination Output Bias, Impedance, and Termination Power Supply Decoupling, Grounding, and Layout Considerations Initial Power-Up Between Burst Operation Distortion, Adjacent Channel Power, and DOCSIS Noise and DOCSIS Evaluation Board Features and Operation Overshoot on PC Printer Ports Transformer and Diplexer Differential Inputs Single-Ended-to-Differential Input Differential Input Installing the Visual Basic Control Software Running the Software Controlling the Gain/Attenuation of the AD8325 Transmit Enable, Transmit Disable, and Sleep Memory Section EVALUATION BOARD FEATURES AND OPERATION EVALUATION BOARD BILL OF MATERIALS OUTLINE DIMENSIONS Revision History