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AD8345ARE-REEL Fiches technique(PDF) 4 Page - Analog Devices |
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AD8345ARE-REEL Fiches technique(HTML) 4 Page - Analog Devices |
4 / 16 page REV. 0 AD8345 –4– PIN FUNCTION DESCRIPTIONS Equivalent Pin No. Mnemonic Function Circuit 1, 2 IBBP, IBBN I Channel Baseband Differential Input Pins. These high impedance inputs should Circuit A be dc biased to approximately 0.7 V. Nominal characterized ac swing is 0.6 V p-p on each pin (0.4 V to 1 V). This gives a differential drive of 1.2 V p-p. Inputs are not self-biasing so external biasing circuitry must be used in ac-coupled applications. 3, 9, 13, 14 COM3 Ground Pin for Input V-to-I Converters and Mixer Core. 4 COM1 Ground Pin for the LO Phase-Splitter and LO Buffers. 5, 6 LOIN, LOIP Differential LO Drive Pins. Internal dc bias (approximately 1.8 V @ VS = 5 V) Circuit B is supplied. Pins must be ac-coupled. Single-ended or differential drive is permissible. 7 VPS1 Power Supply Pin for the Bias Cell and LO Buffers. This pin should be decoupled using local 1000 pF and 0.01 µF capacitors. 8 ENBL Enable Pin. A high level enables the device; a low level puts the device in sleep mode. Circuit C 10 COM2 Ground Pin for the Output Stage of Output Amplifier. 11 VOUT 50 Ω DC-Coupled RF Output. Pin should be ac-coupled. Circuit D 12 VPS2 Power supply pin for baseband input voltage to current converters and mixer core. This pin should be decoupled using local 1000 pF and 0.01 µF capacitors. 15, 16 QBBN, QBBP Q Channel Baseband Differential Input Pins. Inputs should be dc biased to Circuit A approximately 0.7 V. Nominal characterized ac swing is 0.6 V p-p on each pin (0.4 V to 1 V). This gives a differential drive level of 1.2 V p-p. Inputs are not self-biasing so external biasing circuitry must be used in ac-coupled applications. EQUIVALENT CIRCUITS INPUT CURRENT MIRROR TO MIXER CORE BUFFER VPS2 Circuit A PHASE SPLITTER CONTINUES LOIN VPS1 LOIP Circuit B ENBL 100k VPS2 100k 100k TO BIAS FOR STARTUP/ SHUTDOWN Circuit C 40 40 VPS2 VOUT Circuit D Figure 1. Equivalent Circuits |
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