TDF8599A 데이터 시트보기 (PDF) - NXP Semiconductors.

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TDF8599A

I2C-bus controlled dual channel 135 W/4Ω, single channel 250 W/2Ω class-D power amplifier with load diagnostics

NXP Semiconductors. 

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:

f SSM = -2----×-----C----S---S--M---I---S×--S---VM----1----×-----1---0----%--- [Hz]

(2)

where the voltage on pin OSCSET = V1 and is calculated as 100 µA × Rosc (V) with

ISSM = 5 µA.

100 µA

OSCSET

100 µA

OSCSET

Rosc

Cosc

SSM

a. Off

Fig 6. Spread spectrum mode

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5 µA

ISSM

b. On

Rosc

Cosc

SSM

CSSM

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The frequency swings between 0.95 × fosc and 1.05 × fosc; see Figure 7.

OSCIO

max(V)

SSM

min(V)

Fig 7. Spread spectrum operation in Master mode

t (ms)

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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).

TDF8599A_2

Product data sheet

Rev. 02 — 30 June 2009

© NXP B.V. 2009. All rights reserved.

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