TDF8599 NXP Semiconductors, TDF8599 Datasheet - Page 10

• Manufacturer Part Number: TDF8599
• Description: I2C-bus controlled dual channel 43 W/2 W single channel 85 W/1 W class-D power amplifier
• Manufacturer: NXP Semiconductors

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NXP Semiconductors
TDF8599_1
Product data sheet
Fig 7.
Fig 8.
OSCIO
max(V)
min(V)
a. Off
SSM
Spread spectrum mode
Spread spectrum operation in Master mode
100 A
8.3.3 Frequency hopping (Master mode)
8.3.4 Phase lock operation (Slave mode)
The spread spectrum frequency can be calculated using:
where the voltage on pin OSCSET = V
I
The frequency swings between 0.95
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 I
10 % to 0.9
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
is in Slave mode by connecting two capacitors (C
between pin SSM and pin AGND (see
disables phase lock operation and causes the slave to use the external oscillator signal
SSM
OSCSET
SSM
f
SSM
= 5 A.
=
R osc
----------------------------------------------------- - Hz
2 C
001aai773
f
osc
SSM
C osc
or 1.1
I
SSM
Rev. 01 — 13 November 2008
V
Section
1
f
osc
10 %
using bit IB1[D3:D4]. See
8.4.2. Phase lock operation is enabled when the oscillator
Figure
1
f
osc
2
b. On
Class-D power amplifier with load diagnostics
and is calculated as 100 A
C-bus mode, this frequency can be varied by
and 1.05
9). Connecting pin SSM to pin AGND
100 A
I SSM
5 A
PLL_S
f
osc
and C
Figure
, see
OSCSET
SSM
PLL_p
Figure
8.
R osc
C SSM
) and a resistor (R
001aai774
8.
R
TDF8599
© NXP B.V. 2008. All rights reserved.
osc
C osc
(V) with
t (ms)
001aai775
10 of 52
PLL
(2)
)