STA529Q STMicroelectronics, STA529Q Datasheet - Page 19

• Manufacturer Part Number: STA529Q
• Description: IC AMP 2X100MW CLASS D 52VFQFPN
• Manufacturer: STMicroelectronics
• Series: Sound Terminal™r
• Type: Class Dr

Specifications of STA529Q

• Output Type: 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 100mW x 2 @ 16 Ohm
• Voltage - Supply: 1.5 V ~ 1.95 V
• Features: Depop, I²C, I²S, Mute, Volume Control
• Mounting Type: Surface Mount
• Package / Case: 52-VFQFN, 52-VFQFPN
• Ic Function: FFX Audio Codec Analogue & Digital Inputs, Class D Amplifier
• Brief Features: Up To 96dB Dynamic Range, FFX Class-D Driver
• Supply Voltage Range: 1.55V To 1.95V, 1.8V To 3.6V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8879

STA529
6
6.1
PLL
Figure 5
Figure 5.
Functional description
Phase/frequency detector
The phase/frequency detector (PFD) compares the phase difference between the
corresponding rising edges of INFIN and FBCLK, (clock output from the loop frequency
divider) by generating voltage pulses with widths proportional to the input phase error.
Charge pump and loop filter
This block converts the voltage pulses from the phase/frequency detector to current pulses
which charge the loop filter and generate the control voltage for the voltage-controlled
oscillator. The loop filter is placed external to the PLL on pin FILT.
Voltage controlled oscillator
The voltage controlled oscillator (VCO) is the oscillator inside the PLL. It produces a
frequency (f
CLKIN
IDF
INFOUT
REFOUT
STRB
STRB_BYPASS
FRAC_CTRL
shows the main components of the PLL.
VCO
PLL block diagram
DITHER_DISABLE
) proportional to the input control voltage.
FRAC_INPUT
Input frequency
Buffer
divider
Doc ID 13095 Rev 2
FBCLK
Fractional controller
INFIN
Loop frequency divider
NDIV
frequency
divider
Phase
(PFD)
INFIN
FBCLK
pump and
loop filter
Charge
Lock detect
frequency
Output
divider
VCO
f
VCO
LF
VCONT
LOCKP
FILT
PHI
19/55
PLL