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CMX991 Datasheet(PDF) 9 Page - CML Microcircuits |
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CMX991 Datasheet(HTML) 9 Page - CML Microcircuits |
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9 / 56 page  RF Quadrature Transceiver / RF Quadrature Receiver CMX991/CMX992 2015 CML Microsystems Plc 9 D/991_992/20 Package Q3 Pin No. Pin Name (CMX991) Pin Name (CMX992) Signal Type Description 36 VDDIO VDDIO Power Supply to C-BUS circuits 37 LNAON LNAON O/P Control line to enable/disable Rx LNA 38 VCCSYNTH VCCSYNTH Power Supply to IF integer N PLL 39 FREF FREF I/P Reference frequency input 40 DOIF DOIF O/P IF PLL charge pump output 41 VCOP VCOP I/P IF PLL VCO positive input 42 VCON VCON I/P IF PLL VCO negative input 43 VBIAS VBIAS O/P Bandgap generated bias voltage – measurement output 44 TXQP (Note 2) NC I/P CMX991: TxQ positive input NC CMX992: Do not connect to this pin, reserved for future use 45 TXQN (Note 2) NC I/P CMX991: TxQ negative input NC CMX992: Do not connect to this pin, reserved for future use 46 TXIN NC I/P CMX991: TxI negative input NC CMX992: Do not connect to this pin, reserved for future use 47 TXIP NC I/P CMX991: TxI positive input NC CMX992: Do not connect to this pin, reserved for future use 48 TXIFOUT NC O/P CMX991: Tx IF output NC CMX992: Do not connect to this pin, reserved for future use EXPOSED METAL PAD AGND AGND Power The exposed metal pad must be electrically connected to analogue ground Total = 49 Pins (48 pins and central, exposed metal ground pad) Table 1 Pin List Notes: 1) I/P = Input O/P = Output T/S = 3-state NC = Not Connected 2) In versions of the datasheet before D/991_992/13 these pins were incorrectly referenced as pin 44 = TXQN and pin 45 = TXQP causing a spectrum inversion at the modulator output. 3.1 Signal Definitions Signal Name Pins Usage AVDD VCCIF, VCCRF, VCCSYNTH Power supply for analogue circuits. DVDD DVDD Power supply for digital circuits. VDDIO VDDIO Power supply voltage for digital interface (C-BUS). VBIAS VBIAS Bandgap generated bias voltage used as a reference for differential amplifier stages. Decoupling is optional but, if used, a capacitor of >200nF should be connected between VBIAS and AVSS. DVSS DGND Ground for digital circuits. AVSS AGND Ground for analogue circuits. Table 2 Definition of Power Supply and Reference Voltages |
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