TDA7333NTR STMicroelectronics, TDA7333NTR Datasheet - Page 12

• Manufacturer Part Number: TDA7333NTR
• Description: IC SIGNAL PROC RDS/RDBS 16TSSOP
• Manufacturer: STMicroelectronics
• Type: RDS/RBDS Signal Processorr

Specifications of TDA7333NTR

• Voltage - Supply, Analog: 3 V ~ 3.6 V
• Voltage - Supply, Digital: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Applications: -

Functional description
3.4
12/26
RDS bandpass filter and interpolator
The 8
With linear phase characteristics in the passband and approximately flat group delay it
guarantees best filter function of the RDS and ARI signal. Four biquads are cascaded
working at a common sampling frequency of XTI/2/16.
Figure 5.
Figure 6.
The output sample of the bandpass filter is picked up from a linear interpolator with sinc2
characteristics. The interpolation factor is 32. A zero cross detection is simply formed by
taking the sign bit of the interpolated signal. This signal which contains only phase
informations is processed by the RDS Demodulator.
th
order digital RDS bandpass filter is of type Tschebyscheff and centered at 57 kHz.
Transfer function of RDS bandpass filter
Phase response of the RDS bandpass filter
100
2
3
1
3
2
1
0
10
20
30
40
50
60
70
80
90
10
0
4
5.6
4.5
5.65
5
Transfer Function of RDS Filter
Phase of RDS Filter
Frequency [Hz]
Frequency [Hz]
5.5
5.7
6
5.75
6.5
7
5.8
x 10
x 10
4
4
TDA7333