PT2579-S

PT2579_10 PTC | Alldatasheet

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Technical content

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 1 - May, 2008 RDS Demodulator IC PT2579

DESCRIPTION

PT2579 is a Radio Data System Demodulator IC utilizing CMOS Technology specially designed for radio data system applications. The RDS data signal (RDDA) and the RDS clock signal (RDCL) are provided as outputs for further processing by an ideal decoder / microcontroller. Anti-aliasing Filter (2nd order), 57KHz band pass filter (8th order), reconstruction filter (2nd order), clocked comparator with automatic offset compensation, biphase symbol decoder, differential decoder, and signal quality detector are all built into a single chip having the highest performance and reliability. Pin assignments and application circuit are optimized for easy PCB layout and cost saving advantages.

FEATURES

• CMOS technology
• Low power consumption
• Anti-Aliasing filter (2nd Order)
• Reconstruction filter (2nd Order)
• 57KHz Band-Pass filet (8th Order)
• 57KHz carrier regeneration
• Differential decoder
• Signal quality detector
• Subcarrier output
• Selectable 4.332 / 8.664MHz Crystal Oscillator with variable dividers
• Synchronous demodulator for 57KHz Modulated RDS signals
• Clocked comparator with aut omatic offset compensation
• Clock generation with Lock on Biphase data rate
• Biphase symbol decoder with integrate and dump functions
• Available in 16 pins, DIP or SOP

APPLICATIONS

• Car radio
• Home stereo tuner

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 2 - May, 2008 RDS Demodulator IC PT2579 BLOCK DIAGRAM

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 3 - May, 2008 RDS Demodulator IC PT2579 PIN CONFIGURATION QUAL 161R D C L RDDA 152 T57 VREF 14 3 OSC2 MUXL 134O S C 1 AVDD 12 5 DVDD AVSS 11 6 DVSS CIN 107 TEST SCOUT 98 MODE PT2579 PIN DESCRIPTION Pin Name I/O Description Pin No. QUAL O Quality indicator output pin 1 RDDA O RDS data output pin 2 VREF - Reference voltage 3 MUX I Multiplex signal input pin 4 AVDD - Analog supply voltage (+5V) 5 AVSS - Analog ground pin (0V) 6 CIN I Subcarrier input pin to the comparator 7 SCOUT O Reconstruction filter subcarrier output pin 8 MODE I Oscillator mode / test control input pin 9 TEST I Test pin 10 DVSS - Digital ground pin (0V) 11 DVDD - Digital supply voltage (+5V) 12 OSC1 I Oscillator input pin 13 OSC2 O Oscillator output pin 14 T57 O 57KHz clock signal output pin 15 RDCL O RDS clock output pin 16

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 4 - May, 2008 RDS Demodulator IC PT2579 FUNCTION DESCRIPTION PT2579 is a demodulator chip specially designed for radio data system applications. It provides 57KHz bandpass filter and a digital demodulator to regenerate the RDS data stream out of the multiplex signal (MPX). PT2579 consists of the Filter and Digital Sections. FILTER SECTION The MUX Signal is band limited by a second order anti-aliasing filter and fed through a 57KHz 8th order bandpass filter with a 3KHz bandwidth. This separates the RDS signals. This filter uses switch capacitor technique and uses a clock frequency of 541.5KHz which is derived from the 4.332/8.664 MHz crystal oscillator. The signal is then fed into the reconstruction filter to smooth the sampled and filtered RDS signal before it is outputted on the SCOUT pin. The signal is AC-coupled to the comparator pin (CIN). The comparator uses a frequency of 228KHz (synchronized by the 57KHz of the demodulator). DIGITAL SECTION The Costas Loop Circuit together with the carrier regeneration demodulates the internal coupled digitized signal. The suppressed carrier is recovered from the 2 sidebands (Costas Loop). The demodulated signal is low-pass filtered in such a way that the over all pulse shape (transmitter and receiver) approaches a cosinusoidal form in conjunction with the following integrate and dump circuit. The data spectrum shaping is divided into two equal parts and handled in the transmitter and in the receiver. Ideally, the data filtering should be equal in both of these parts. The overall data channel spectrum shaping of the transmitter and the receiver is approximately 100% roll off. Theintegrate and dump circuit performs anintegration over a clock period. This results in a demodulation and valid RDS signal in form of biphase symbols being outputted from the integrate and dump circuit. The final stages of the RDS data processing are the biphase symbol decoding and the differential decoding. After synchronization by the data clock RDCL, data appears on the RDDA output. The output of the biphase symbol decoder is evaluated by a special circuit to provide an indication of good data (QUAL=HIGH) or corrupt data (QUAL=LOW).

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 5 - May, 2008 RDS Demodulator IC PT2579 TIMING The fixed and variable dividers are applied to the 4.332/8.664MHz crystal oscillator to generate the 1.1875KHz RDS Clock – RDCL. The RDCL is synchronized with the incoming data. No matter what clock edge is considered, the data will be valid for a period of 399 us after clock transition. The data change timing is 4µs before a clock change. Which clock transition (i.e. positive or negative going clock), the data change occurs in, depends on the lock conditions and is arbitrary (bit slip). When the reception is poor, it is possible that faults in phase occur, then the clock signal stays uninterrupted and data is constant for 1.5 clock periods. Normally, faults in phase do not occur in a cyclic manner. If however, the faults in the phase occur in this way, the minimum spacing between two possible faults in phase depends on the data being transmitted. The minimum spacing cannot be less than 16 clock period. The quality bit changes only at the time of a data change. The diagram below shows the RDS timing waveform which includes a phase jump. 4sµ421 sµ4sµ 842 sµ RDDA QUAL RDCL

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 6 - May, 2008 RDS Demodulator IC PT2579 ABSOLUTE MAXIMUM RATING Parameter Symbol Condition Min. Max. Unit Analog supply voltage AV DD AV DD 0 6 V Digital supply voltage DV DD DV DD 0 6 V Voltage on all pins except GND Vn -0.5 V DDX+0.5 V Operating temperature Topr -40 +85 ℃ Storage temperature Tstg -65 +150 ℃

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ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, AVDD=DVDD=5V, Ta=25℃) Parameter Symbol Conditions Min. Typ. Max. Unit Analog supply voltage AVDD AV DD 3.3 5.0 5.5 V Digital supply voltage DVDD DV DD 3.3 5.0 5.5 V Total supply current Itot I5 + I12 - 6 - mA Reference voltage Vref VREF, AV DD=5V - 2.5 - V MPX Input (Signal before the Capacitor on Pin 4) RDS amplitude (RMS value) ViMPX(rms) f=+1.2KHz RDS f=+3.5KHz ARI (see Note) 1 - - mV f=57±2KHz 200 - - mV f<50KHz 1.4 - - V f<15KHz 2.8 - - V Maximum input signal capability (peak to peak value) V iMPX(p-p) f>70KHz 3.5 - - V Input impedance R4-6 f=0 to 100KHz 40 - - K Ω Signal gain G8-4 f=57KHz 17 20 23 dB 57KHz Band-Pass Filter Center frequency fc Ta=-40 to +85℃ 56.5 57.0 57.5 KHz -3dB bandwidth B - 2.5 3.0 3.5 KHz f=±7KHz 31 - - dB f<45KHz 40 - - dB f<20KHz 50 - - dB Stop band gain G f>70KHz 40 - - dB Output resistance (pin 8) Ro (8) f=57KHz - 26 - Ω Comparator Input (Pin 7) Minimum input level (RMS value) Vi(rms) f=57KHz - 1 10 mV Input resistance R i - 70 110 150 K Ω Oscillator Input (Pin 13) High level input voltage VIH DV DD=5.0V 4.0 - - V Low level input Voltage VIL DV DD=5.0V - - 1.0 V Input current I I DV DD=5.5V - - ±1 µA

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 8 - May, 2008 RDS Demodulator IC PT2579 Parameter Symbol Conditions Min. Typ. Max. Unit Digital Demodulator and Outputs – QUAL, RDDA, T57, OSC2, RDCL High level output voltage V OH I Q=-20µA, DVDD=4.5V 4.4 - - V Low level output voltage VOL I Q=3.2mA, DVDD=5.5V - - 0.4 V Nominal clock frequency fRDCL RDCL - 1187.5 - Hz RDCL jitter t RDCL - - - 18 µs Nominal subcarrier frequency fT57 T57 (see Note 1) - 57.0 - KHz OSC2 DVDD=4.5V, V14=0.4V 1.5 - - mA OSC2 DVDD=4.5V, V14=4.1V -1.6 - - mA QUAL, RDDA, T57, RDCL DVDD=4.5V, V14=0.4V 5.9 - - mA Output current I O QUAL, RDDA, T57, RDCL DVDD=4.5V, V14=4.1V -5.3 - - mA

4.332 MHz Crystal Parameter

Crystal frequency f0 - - 4.332 - MHz Maximum permitted tolerance fmax - ±50 - 10 -6 Ta=25℃ - - ±20 10 -6f0 adjustment tolerance f0 Ta=-40 to +85℃ - - ±25 10 -6 Load capacitance CL - 30 - pF Resonance resistance Rxtal - - 60 Ω

8.664 MHz Crystal

Crystal frequency f0 - - 8.664 - MHz Maximum permitted tolerance fmax - ±50 - 10 -6 f0 adjustment tolerance f0 Ta=-40 to +85 ℃ - - ±30 10 -6 Load capacitance CL - 30 - pF Resonance resistance Rxtal - - 60 Ω Note: The signal T57 has a phase lead of 123° (±180°) relative to ARI carrier at output SCOUT.

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 9 - May, 2008 RDS Demodulator IC PT2579 APPLICATION CIRCUIT QUAL RDCL RDDA T57 VREF OSC2 MUXL OSC1 AVDD DVDD AVSS DVSS CIN TEST SCOUT MODE 560pF +5V 0.1 Fµ 2.2 Fµ 330pFMUX SIGNAL 2.2K Ω 4.332/8.664MHz 47pF 82pF 0.1 Fµ +5V PT2579 Note: Two crystal frequencies may be used via the MODE pin. Please refer to the table below. For the 4.332MHz Crystal, it is recommended to use TXC 6A04300098 or a component with the same specifications. MODE Pin State Crystal Clock Frequency (MHz) LOW 4.332 HIGH 8.664

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 10 - May, 2008 RDS Demodulator IC PT2579 ORDER INFORMATION Valid Part Number Package Type Top Code PT2579 16 pins, DIP, 300mil PT2579 PT2579-S 16 pins, SOP, 300mil PT2579-S PT2579-SN 16 pins, SOP, 150mil PT2579-SN PT2579-X 16 pins, SSOP, 150mil PT2579-X

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PACKAGE INFORMATION

16 PINS, DIP, 300MIL

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 12 - May, 2008 RDS Demodulator IC PT2579 Symbol Min. Nom. Max. A - - 0.210 A1 0.015 - - A2 0.115 0.130 0.195 b 0.014 0.018 0.022 b1 0.014 0.018 0.020 b2 0.045 0.060 0.070 b3 0.030 0.039 0.045 c 0.008 0.010 0.014 c1 0.008 0.010 0.011 D 0.780 0.790 0.800 D1 0.005 - - E 0.300 0.310 0.325 E1 0.240 0.250 0.280 e 0.100 bsc eA 0.300 bsc eB - - 0.430 eC 0.000 - 0.060 L 0.115 0.130 0.150 Notes: 1. All dimensions are in INCHES. 2. Dimensioning and toleranc ing per ANSI Y14.5M-1982. 3. Dimensions “A”, “A1” and “L” are measured with the package seated in JEDEC Seating Plane Gauge GS-3. 4. “D”, “D1” and “E1” dimensions do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.010 inch. 5. “E” and “eA” measured with the leads c onstrained to be perpendicular to datum -c-. “eB” and “eC” are measured at the lead tips with the loads unconstrained. 6. “N” is the number of terminal positions. (N=16) 7. Pointed or rounded lead tips ar e preferred to ease insertion. 8. “b2” and “b3” maximum dimensions are not include dambar protrusions. Dambar protrusions shall not exceed 0.010 inch (0.25 mm). 9. Distance between leads including Dambar protrusions to be 0.005 inch minimum. 10. Datum plane -H- coincident with the bottom of lead, where lead exits body. 11. Refer to JEDEC MS-001 Variation AB. JEDEC is the trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.

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16 PINS, SOP, 300MIL

-B- E H .25 (.010) M B M .25 (.010) M C A M B S A SEATING PLANE -C- .10 (.004) -A- D -e- B L h X 45 C N 123 INDEX AREA Symbol Min. Max A 2.35 2.65 A1 0.10 0.30 B 0.33 0.51 C 0.23 0.32 D 10.10 10.50 E 7.40 7.60 e 1.27 BSC H 10.00 10.65 h 0.25 0.75 L 0.40 1.27 α 0o 8o

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 14 - May, 2008 RDS Demodulator IC PT2579 Notes: 1. Dimensioning and toleranc ing per ANSI Y14.5M-1982. 2. Dimension “D” does not include mold flash, prot rusions or gate burrs. Mold Flash, protrusion or gate burrs shall not exceed 0.15 mm (0.006 in) per side. 3. Dimension “E” does not include interlead flash or protrusions. Interlead flash or protrusions shall not exceed 0.25 mm (0.010 in) per side. 4. The chamfer on the body is optional. It is not present, a visual index feature must be located within the crosshatched area. 5. “L” is the length of the terminal for soldering to a substrate. 6. N is the number of the terminal positions (N=16) 7. The lead width “B” as measured 0.36 mm (0.014 in ) or greater above the seating plane, shall not exceed a maximum value of 0.61 mm (0.24 in). 8. Controlling dimension : MILLIMETER. 9. Refer to JEDEC MS-013, Variation AA. JEDEC is the trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 15 - May, 2008 RDS Demodulator IC PT2579

16 PINS, SOP, 150MIL

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 16 - May, 2008 RDS Demodulator IC PT2579

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 17 - May, 2008 RDS Demodulator IC PT2579 Symbol Min. Typ. Max. A 1.35 - 1.75 A1 0.10 - 0.25 A2 1.25 - 1.65 b 0.31 - 0.51 b1 0.28 - 0.48 c 0.17 - 0.25 c1 0.17 - 0.23 D 9.90 BSC. E 6.00 BSC. E1 3.90 BSC. e 1.27 BSC. L 0.40 - 1.27 L1 1.04 REF. L2 0.25 BSC. R 0.07 - - R1 0.07 - h 0.25 - 0.50 θ 0° - 8° θ1 5° - 15° θ2 0° - - Note: 1. Dimensioning and toleranc ing per ANSI Y 14.5M-1994 2. Controlling Dimension: MILLIMETERS. 3. Dimension D does not include mold flash protrusi ons or gate burrs. Mold flash, protrusions or gate burrs shall not exceed 0.15 mm (0.006 in) per end. Dimension E1 does not include interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.25mm per side. D and E1 dimensions are determined at datum H. 4. The package top may be smaller than the package bottom. Dimensions D and E1 are determined at the outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs and interlead flash, but including any mismatch between the top and bottom of the plastic body. 5. Datums A & B to be determined at datum H. 6. N is the number of terminal positions. (N=16) 7. The dimensions apply to the flat section of the lead between 0.10 to 0.25mm from the lead tip. 8. Dimension “b” does not include dambar prot rusion. Allowable dambar protrusion shall be 0.10mm total in excess of the “b” dimension at maximum material condition. The dambar cannot be located on the lower radius of the foot. 9. This chamfer feature is optional. If it is not pr esent, then a pin 1 identifier must be located within the index area indicated. 10. Refer to JEDEC MS-012, Variation AC. JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 18 - May, 2008 RDS Demodulator IC PT2579

16 PINS, SSOP, 150MIL

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 19 - May, 2008 RDS Demodulator IC PT2579

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 20 - May, 2008 RDS Demodulator IC PT2579 Symbol Min. Nom. Max. A 0.053 - 0.069 A1 0.004 - 0.010 A2 0.049 - 0.065 b 0.008 - 0.012 b1 0.008 0.010 0.011 c 0.006 - 0.010 c1 0.006 0.008 0.009 D 0.193 BSC E 0.236 BSC E1 0.154 BSC e 0.025 BAS L 0.016 - 0.050 L1 0.041 REF L2 0.010 BAS R 0.003 - - R1 0.003 - - θ 0 ° - 8° θ1 5 ° - 15° θ2 0 ° - - aaa 0.004 bbb 0.008 ccc 0.004 ddd 0.007 eee 0.004

Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2579 V1.6 - 21 - May, 2008 RDS Demodulator IC PT2579 Notes: 1. Dimensioning and toleranc ing per ANSI Y14.5M-1982. 2. Dimensions in inches (angles in degrees) 3. Dimension D does not include mold flash, protru sions or gate burrs. Mold flash, protrusions or gate burrs shall not exceed 0.006” per end. Dimension E1 does not include interlead flash or protrusions. Interlead flash or protrusions shall not exceed “0.006” per side. D1 and E1 dimensions are determined at dutum H. 4. The package top may be smaller than the pack age bottom. Dimensions D and E1 are determined at the outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs and interlead flash, but including any mismatch between the top and bottom of the plastic. 5. Datums A and B to be determined at datum H. 6. N is the maximum number of terminal position. (N=16) 7. The dimensions apply to the flat section of the lead between 0.004 to 0.010 inches from the lead tip. 8. Dimension b does not include dambar protrusi on. Allowable dambar protrusion shall be 0.004” total in excess of b dimension at maximum material condition. The dambar can not be located on the lower radius of the foot. 9. Refer to JEDEC MO-137 variation AB. JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION