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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TDF8599TH датащи(PDF) 10 Page - NXP Semiconductors |
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TDF8599TH датащи(HTML) 10 Page - NXP Semiconductors |
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10 / 52 page  TDF8599_1 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 01 — 13 November 2008 10 of 52 NXP Semiconductors TDF8599 Class-D power amplifier with load diagnostics The spread spectrum frequency can be calculated using: (2) where the voltage on pin OSCSET = V1 and is calculated as 100 µA × Rosc (V) with ISSM =5 µA. The frequency swings between 0.95 × f osc and 1.05 × fosc, see Figure 8. 8.3.3 Frequency hopping (Master mode) Frequency hopping is a technique used to change the oscillator frequency for AM tuner compatibility. In Master mode, the resistor connected between pin OSCSET and pin AGND sets the oscillator frequency. In I2C-bus mode, this frequency can be varied by 10 % to 0.9 × f osc or 1.1 × fosc using bit IB1[D3:D4]. See Figure 8. 8.3.4 Phase lock operation (Slave mode) In Slave mode, phase lock operation can be used to reduce the jitter effects of the external oscillator signal connected to pin OSCIO. Phase lock operation is also needed to enable phase staggering, see Section 8.4.2. Phase lock operation is enabled when the oscillator is in Slave mode by connecting two capacitors (CPLL_S and CPLL_p) and a resistor (RPLL) between pin SSM and pin AGND (see Figure 9). Connecting pin SSM to pin AGND disables phase lock operation and causes the slave to use the external oscillator signal f SSM I SSM 2C SSM × V 1 × 10 % × ------------------------------------------------------ Hz [] = a. Off b. On Fig 7. Spread spectrum mode 001aai773 100 µA Rosc SSM Cosc OSCSET 001aai774 100 µA 5 µA ISSM Rosc SSM Cosc CSSM OSCSET Fig 8. Spread spectrum operation in Master mode 001aai775 t (ms) OSCIO max(V) min(V) SSM |
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