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TDF8599TD データシート(PDF) 10 Page - NXP Semiconductors

部品番号 TDF8599TD
部品情報  I2C-bus controlled dual channel 43 W/2 W single channel 85 W/1 W class-D power amplifier with load diagnostics
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メーカー  NXP [NXP Semiconductors]
ホームページ  http://www.nxp.com
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TDF8599TD データシート(HTML) 10 Page - NXP Semiconductors

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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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