TDF8599B datasheet(10/54 Pages) NXP

10 / 54 page

NXP Semiconductors

TDF8599B

I2C-bus controlled dual channel 43 W/2 Ohm, single channel 85 W/1 Ohm class-D power amplifier with

load diagnostics

TDF8599B

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 2 — 23 August 2016

10 / 54

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).

8.3.4 Phase lock operation (Slave mode)

In Slave mode, Phase-Locked Loop (PLL) operation can be used to reduce the jitter

effect 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 8). Connecting

pin SSM to pin AGND disables phase lock operation and causes the slave to directly

use the external oscillator signal. Values for CPLL_s, CPLL_p and RPLL depend on the

desired loop bandwidth (BPLL) of the PLL. RPLL is given by: RPLL = 8.4 × BPLL Ω. The

corresponding values for CPLL_p and CPLL_s are given by Equation 3 and Equation 4:

(3)

Remark: CPLL_p is only needed when 1/4 π phase shift is selected. See Section 8.4.2 for

more detailed information.

(4)

When pin OSCIO is connected to a clock-master with Spread spectrum mode enabled,

the PLL loop bandwidth BPLL should be 100 × fSSM.

001aai776

100 µA

SSM

OSCSET

PLL

a. Off

Figure 8. Phase lock operation

001aai777

100 µA

PLL

OSCSET

RPLL

CPLL_p(1)

CPLL_s

SSM

(1) Only needed when 1/4 π phase shift is

selected.

b. On

Table 7 lists all oscillator modes.

Table 7. Oscillator modes

OSCSET pin

OSCIO pin SSM pin

Oscillator modes

Rosc > 26 kΩ

output

CSSM to pin AGND

master, spread spectrum

Rosc > 26 kΩ

output

shorted to pin AGND

master, no spread spectrum

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