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november 2008 rev 7 1/12 12 tda7479 single chip rds demodulator + filter features very high rds demodulation quality with improved digital signal processing high performance, 57 khz bandpass filter (8 th order) filter adjustment free and without external components purely digital rds demodulation without external components ari (sk indication) and rds signal quality output 4.332 mhz crystal oscillator (8.664 and 17.328 mhz optional) low noise cmos technology low radiation description the tda7479 recovers the additional inaudible rds information which is transmitted by fm radio broadcasting stations and operates in accordance with the ebu (european broadcasting union) specifications. the device is made up of two sections: a cascaded antialiasing + switched capacitors 8 th bandpass filter for precise rds band selection and a demodulating section that performs the extraction od rds data stream (rdda) and clock (rdcl), to be further processed by a suitable rds decoder. outputs for rds signal quality and ari indication are also present. so16 tssop16 table 1. device summary order code package packing e-tda7479d (1) 1. device in ecopack? package (see section 5: package information on page 9 ). so16 tube E-TDA7479AD (1) tssop16 tube www.st.com
contents tda7479 2/12 contents 1 block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 output timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 oscillator controls (fsel, osel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
tda7479 block diagram and pin description 3/12 1 block diagram and pin description 1.1 block diagram figure 1. block diagram 1.2 pin description figure 2. pin connection (top view) 2nd order antialiasing filter 8th order sc-bandpass filter mpx 4 270pf - + 8 filout 12 v s 3 vref 100nf 10 f oscillator & divider 57khz pll fast ari indicator polarity biphase dec. integral biphase dec. 1187.5hz pll mux 0 1 diff. decoder test logic qual det. 6 gnd 11 extres 14 13 5 9 16 7 1 d97au751a tm 10 rdda 2 qual ari rdcl fsel osel oscout oscin 4.332mhz c2 47pf c1 27pf 15 t57 qual rdda vref mpx osel ari gnd 1 3 2 4 5 6 7tm v s extres oscin oscout t57 rdcl 16 15 14 13 12 10 11 d97au752 filout 8 fsel 9
block diagram and pin description tda7479 4/12 table 2. pin description no pin name description 1 qual output for signal quality indication (high = good) 2 rdda rds data output 3 vref reference voltage 4 mpx rds input signal 5 osel oscillator selector pin: ? open, closed to v s = quartz oscillator ? closed to gnd = external driven 6 gnd ground 7ari output for ari indication: ? high when rds+ari are present ? high when only ari is present ? low when only rds is present ? undefined when nos signal is present 8 filout filter output 9 fsel frequency selector pin: ? 100 khz to v s = 17.328 mhz ? open = 4.332mhz ? closed to vs = 8.664 mhz 10 tm test mode pin: ? open = normal operation ? closed to vs = test mode 11 extres reset pin: ? open = run mode ? -closed to vs = reset condition 12 v s supply voltage 13 oscin oscillator input 14 oscout oscillator output 15 t57 testing output pin: 57 khz clock output 16 rdcl rds clock output 1187.5 hz
tda7479 electrical specification 5/12 2 electrical specification 2.1 thermal data 2.2 absolute maximum ratings 2.3 electrical characteristics table 3. thermal data symbol parameter so16 tssop16 unit r th j-case thermal resistance junction to case max. 200 160 c/w table 4. absolute maximum ratings symbol parameter value unit v s supply voltage -0.3 to 7 v t op operating temperature range -40 to 85 c t stg storage temperature -55 to 150 c table 5. electrical characteristics (t amb = 25c, v s = 5v, unless otherwise specified) symbol parameter test condition min. typ. max. unit v s supply voltage 4.5 5 5.5 v i s supply current 7.5 11.0 ma filter f c center frequency 56.5 57 57.5 khz bw 3db bandwidth 2.5 3 3.5 khz g gain f = 57 khz 18 20 22 db a attenuation f 4 khz 18 22 db f = 38 khz 50 60 db f = 67 khz 35 45 db r i input impedance of mpx 80 120 150 k r l load impedance on filout 1 m s/n signal to noise ratio v in = 3 mvrms 30 40 db v in mpx input signal f = 19 khz; t3 40 db (1) f = 57 khz (rds+ ari) 1000 50 mv rms mv rms s rds rds detection sensitivity 1 mvrms s ari ari detection sensitivity 3 mvrms
electrical specification tda7479 6/12 v ref reference v s /2 v demodulator input pins (extres, fsel, tm:) all with internal pull down resistor input pin (osel): with internal pull up resistor i pd input current v in = 5 v (pull-down input) 15 30 a i pu input current v in = 0 v (pull-up input) -25 -10 a v ih input voltage high 0.7 v s 0.8 v s v v il input voltage low 0.2 v s 0.3 v s v output pins (rdcl, rdda, ari, qual, t57) v oh output voltage high i l = 0.5ma 4 4.6 v v ol output voltage low i l = 0.5ma 0.4 1 v oscillator v cll input level oscin pin osel = open circuit 1 v v clh input level oscin pin osel = open circuit 4 v amplitude oscout osel = open circuit 4.5 v v pp amplitude oscin (for external drive) osel = gnd, f = 4.332 mhz osel = gnd, f = 8.664 mhz 100 120 mvpp mvpp osel = gnd, f = 17.328 mhz 150 mvpp 1. the 3 rd harmonic (57 khz) must be less than -40 db with respect to the input signal plus gain. table 5. electrical characteristics (continued) (t amb = 25c, v s = 5v, unless otherwise specified) symbol parameter test condition min. typ. max. unit
tda7479 output timing 7/12 3 output timing the rds (1187.5hz) output clock on rdcl line is synchronized to the incoming data. according to the internal pll lock condition data change can result on the falling or on the rising clock edge (see figure 3 ). whichever clock edge is used by the decoder (rising or falling edge) the data will remain valid for 416.7 s after the clock transition. figure 3. rds timing diagram rdcl rdda clock line data line 4.3s td 4.3s 837.7s 421s 421s
oscillator controls (fsel, osel) tda7479 8/12 4 oscillator controls (fsel, osel) three different crystal frequencies can be used. the adoption of the internal clock divider to the external crystal is achieved via the input pin fsel. see the following table for reference: a special mode is introduced to reduce emi. with pin osel connected to gnd the internal oscillator is switched off and an external sinusoidal frequency could be applied on oscin. the peak to peak voltage of this signal can be reduced down to 60mv. in this mode the fr equency selection via fsel is still active. suggested values of c1 and c2 are shown in the following table: table 6. crystal frequencies crystal fsel (pin configuration) 4.332mhz 8.664mhz 17.328mhz connected to gnd or open connected to vs external resistor of 100k to vs table 7. c1 and c2 value crystal c1 c2 4.332mhz 8.664mhz 17.328mhz 27pf 27pf 27pf 47pf - -
tda7479 package information 9/12 5 package information in order to meet environmental requirements, st (also) offers these devices in ecopack ? packages. ecopack ? packages are lead-free. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an st trademark. ecopack specifications are available at: www.st.com. figure 4. so16 mechanical data and package dimensions outline and mechanical data dim. mm inch min. typ. max. min. typ. max. a 2.35 2.65 0.093 0.104 a1 0.10 0.30 0.004 0.012 b 0.33 0.51 0.013 0.200 c 0.23 0.32 0.009 0.013 d (1) 10.10 10.50 0.398 0.413 e 7.40 7.60 0.291 0.299 e 1.27 0.050 h 10.0 10.65 0.394 0.419 h 0.25 0.75 0.010 0.030 l 0.40 1.27 0.016 0.050 k 0? (min.), 8? (max.) ddd 0.10 0.004 (1) ?d? dimension does not include mold flash, protusions or gate burrs. mold flash, protusions or gate burrs shall not exceed 0.15mm per side. so16 (wide) 0016021 c
package information tda7479 10/12 figure 5. tssop16 mechanical data and package dimensions outline and mechanical data dim. mm inch min. typ. max. min. typ. max. a 1.200 0.047 a1 0.050 0.150 0.002 0.006 a2 0.800 1.000 1.050 0.031 0.039 0.041 b 0.190 0.300 0.007 0.012 c 0.090 0.200 0.005 0.009 d (1) 4.900 5.000 5.100 0.114 0.118 0.122 e 6.200 6.400 6.600 0.244 0.252 0.260 e1 (1) 4.300 4.400 4.500 0.170 0.173 0.177 e 0.650 0.026 l 0.450 0.600 0.750 0.018 0.024 0.030 l1 1.000 0.039 k 0? (min.) 8? (max.) aaa 0.100 0.004 note: 1. d and e1 does not include mold flash or protrusions. mold flash or potrusions shall not exceed 0.15mm (.006inch) per side. tssop16 0080338 (jedec mo-153-ab) (body 4.4mm)
tda7479 revision history 11/12 6 revision history table 8. document revision history date revision changes 10-sep-2004 4 initial release. 20-nov-2004 5 add in table 5: electrical characteristics on page 5 the ?rds and ari detection sensitivity? parameters. 02-dec-2004 6 modified the order codes table. 04-nov-2008 7 document reformatted. updated table 1: device summary on page 1 . updated section 5: package information on page 9 .
tda7479 12/12 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2008 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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