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CMX7861 Datasheet(PDF) 11 Page - CML Microcircuits |
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CMX7861 Datasheet(HTML) 11 Page - CML Microcircuits |
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11 / 58 page  CMX7861 FirmCODEC ® Programmable Baseband Interface CMX7861 2012 CML Microsystems Plc Page 11 D/7861_FI-1.x/2 5 External Components 5.1 Xtal Interface 49 50 XTAL/CLK XTALN C1 DVSS X1 C2 X1 For frequency range see 8.1.2 Operating Limits C1 22pF typical C2 22pF typical Figure 3 Recommended External Components - Xtal Interface Notes: The clock circuit can operate with either a Xtal or external clock generator. If using an external clock generator it should be connected to the XTAL/CLK pin and the Xtal and other components are not required. For external clock generator frequency range see 8.1.2 Operating Limits. When using an external clock generator the Xtal oscillator circuit may be disabled to save power, see 9.2.3 Program Block 1 – Clock Control for details. Also refer to section 7.1 Xtal Frequency. The tracks between the Xtal and the device pins should be as short as possible to achieve maximum stability and best start up performance. It is also important to achieve a low impedance connection between the Xtal capacitors and the ground plane. The DVSS to the Xtal oscillator capacitors C1 and C2 should be of low impedance and preferably be part of the DVSS ground plane to ensure reliable start up. For correct values of capacitors C1 and C2 refer to the documentation of the Xtal used. 5.2 C-BUS Interface 54 57 IRQN DVDD 56 55 53 CSN CDATA RDATA SCLK R2 R2 10k - 100k Figure 4 Recommended External Components - C-BUS Interface Note: If the IRQN line is connected to other compatible pull-down devices only one pull-up resistor is required on the IRQN node. |
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