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CMX885 Datasheet(PDF) 11 Page - CML Microcircuits |
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CMX885 Datasheet(HTML) 11 Page - CML Microcircuits |
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11 / 69 page  Marine VHF Audio and Signalling Processor CMX885 © CML Microsystems Plc 11 2010 D/885/3 Notes: 1. X1 can be a crystal or an external clock generator; this will depend on the application. The tracks between the crystal and the device pins should be as short as possible to achieve maximum stability and best start up performance. By default, a 3.6864MHz clock is selected, other values could be used if the various internal clock dividers are set to appropriate values. 2. R5 should be selected to provide the desired dc gain (assuming C11 is not present) of the DISCN input, as follows: ⏐GAINDISCN⏐ = 100kΩ / R5 The gain should be such that the resultant output at the DISCFB pin is within the input signal range specified in 7.13.2. 3. R7 should be selected to provide the desired dc gain (assuming C13 is not present) of the ALTN input as follows: ⏐GAINALTN⏐ = 100kΩ / R7 The gain should be such that the resultant output at the ALTFB pin is within the input signal range specified in 7.13. 4. R9 should be selected to provide the desired dc gain (assuming C15 is not present) of the MICN input as follows: ⏐GAINMICN⏐ = 100kΩ / R9 The gain should be such that the resultant output at the MICFB pin is within the input signal range specified in 7.13.1. For optimum performance with low signal microphones, an additional external gain stage may be required. 5. C11, C13 and C15 should be selected to maintain the lower frequency roll-off of the MICN, ALTN and DISCN inputs as follows: C11 ≥ 100nF × ⏐GAINDISCN⏐ C13 ≥ 100nF × ⏐GAINALTN⏐ C15 ≥ 30nF × ⏐GAINMICN⏐ 6. ALTN and ALTFB connections allow the user to have an additional signal input. Component connections and values are as for the respective DISCN and MICN networks. If this input is not required, the ALTN pin should be connected to AVss. 7. C5 (AUDIO output) should be increased to 1.0µF if frequencies below 300Hz need to be used on this pin. 8. A single 10µF electrolytic capacitor (C24, fitted as shown) may be used for smoothing the power supply to both VDEC pins, providing they are connected together on the pcb with an adequate width power supply trace. Alternatively, separate smoothing capacitors should be connected to each VDEC pin. High frequency decoupling capacitors (C3 and C23) must always be fitted as close as possible to both VDEC pins. |
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