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TDF8599A Datasheet(PDF) 9 Page - NXP Semiconductors |
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TDF8599A Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 54 page TDF8599A_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 30 June 2009 9 of 54 NXP Semiconductors TDF8599A I2C-bus controlled dual channel class-D power amplifier The capacitor on pin SSM (CSSM) sets the spreading frequency when Spread spectrum mode is active. The current (ISSM) flowing in and out of pin SSM is typically 5 µA. This gives a triangular voltage on pin SSM that sweeps around the voltage set by pin OSCSET ± 5 %. The voltage on pin SSM is used to modulate the oscillator frequency. The spread spectrum frequency (fSSM) can be calculated using Equation 2: (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 × fosc and 1.05 × fosc; see Figure 7. 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 pins OSCSET and AGND sets the oscillator frequency (fosc). In I2C-bus mode, this frequency can be varied by ± 10 %. Set bit IB1[D4] to logic 1 and bit IB1[D3] to either logic 0 (0.9 × fosc) or logic 1 (1.1 × fosc). f SSM I SSM 2C SSM × V 1 × 10 % × ------------------------------------------------------ Hz [] = a. Off b. On Fig 6. Spread spectrum mode 001aai773 100 µA Rosc SSM Cosc OSCSET 001aai774 100 µA 5 µA ISSM Rosc SSM Cosc CSSM OSCSET Fig 7. Spread spectrum operation in Master mode 001aai775 t (ms) OSCIO max(V) min(V) SSM |
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