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TDF8599BTH Datasheet(PDF) 9 Page - NXP Semiconductors

No. de pieza TDF8599BTH
Descripción Electrónicos  I2C-bus controlled dual channel 43 W/4 W, single channel 85 W/1 W class-D power amplifier with load diagnostics
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Fabricante Electrónico  NXP [NXP Semiconductors]
Página de inicio  http://www.nxp.com
Logo NXP - NXP Semiconductors

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TDF8599B_1
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 29 July 2009
9 of 54
NXP Semiconductors
TDF8599B
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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