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CDB5464U Datasheet(PDF) 4 Page - Cirrus Logic |
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CDB5464U Datasheet(HTML) 4 Page - Cirrus Logic |
4 / 38 page CDB5464U 4 DS847DB1 1.3 Analog Section The CDB5464U evaluation board provides screw-type terminals (J23, J27, & J28) to connect input signals to the voltage and current channels. The screw terminals are labels as VIN1-, VIN1+, IIN1+, IIN1-, and IIN2+, IIN2-. An R-C network at each channel input provides a simple anti-alias filter. The evaluation board provides three voltage reference options for VREFIN to the CS5464. The three volt- age reference options include: VREFOUT from CS5464, the on-board +2.5V reference, and external REF+ (screw terminal J14). Table 1 and Table 2 illustrate the options available for VREFIN. With a jumper on J25 in the position labeled VREFOUT, the reference is supplied by the on-chip voltage reference. With a jumper on J25 in the position labeled VREF, the reference is supplied by an off-chip voltage reference. Table 2 illustrates the options available for VREF. With a jumper on J12 in position LT1019, the LT1019 provides a +2.5V reference (the LT1019 was chosen for its low drift - typically 5 ppm/°C). By setting the jumper on J12 to position REF+, an external voltage reference is supplied via screw terminal J14's REF+ input. The three input signal options for the voltage (VIN1±) and current (IIN1±, IIN2±) channels input include: an external signal (screw terminals J23, J27, and J28), GND, or VREF. Table3 illustrates the options avail- able. By installing jumpers on J17 to position VIN1-, J22 to position VIN1+, J24 to position IIN1+, J26 to position IIN1-, J20 to position IIN2+, and J19 to position IIN2-, the input voltage signal is supplied from the screw terminals J23, J27, and J28. With a jumper on J17, J22, J24, J26, J20, and J19 in the GND position, Reference Description J25 VREFOUT Selects On-chip Reference (25 ppm/ °C) VREF Selects External or LT1019 Reference(J12) Table 1. Internal Voltage Reference Selection for VREF Reference Description J12 LT1019 Selects On-board LT1019 Reference (5 ppm/ °C) REF+ Selects External Reference Source (J14) Table 2. External Voltage Reference Selection for VREF O O VREF VREFIN VREFOUT (Default) O O VREF VREFIN VREFOUT O VREF O O VREF LT1019 REF+ O VREF O O VREF LT1019 REF+ (Default) |
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