TDA7522 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

TDA7522

Digital Servo & Decoder

STMicroelectronics 

TDA7522

Figure 5. Delta Sigma Functions

Digital Section

SW by DSP

FIR

FIR

FIR

x2

x2

x2

HW

Linear

interpolation

1bit output

2nd

Noise

Shaper

8 times Oversampling filter

x256 Oversampling

32 times OVS

Fs: 44.1KHz

TDA7522

Fs: 11.28MHz 22bit input

Analog section

3rd

order

SC filter

Smoothing

filter

TDA7521

5.10 Decimation filter

This is for Down sampling filter of Diode signals which have been digitized with Oversampling in Analog

stage (TDA7521).

Input Signals are A+C, B+D, E, F diode signals;

Initial sampling frequency

48Fs (2.1168MHz) / 96Fs (4.2336MHz) for 2x, 4x speed

6 bit resolutions from ADC

After Downsampling

2Fs (88.2KHz) / 4Fs (176.4KHz) for 2x, 4x speed

10 bit resolutions into Servo Block

Downsampling ratio

24times.

5.11 PDM/PWM

This is a single end output stage of Tracking, Focusing actuator, Sled and Spindle motor signal using fol-

lowing technic.

Pulse-width modulation (PWM)

Pulse density modulation (PDM)

There are 8 bit Output accuracy.

5.12 SPDIF

This is a decoder to output Audio&Subcode data based on standard format of AES/EBU digital output.

20/23

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