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this is information on a product in full production. for further information contact your local stmicroelectronics sales office. september 2013 doc id 022898 rev 3 1/16 16 TDA7706 highly integrated tuner for am/fm car-radio data brief ? production data features fm, am and weather band reception fully integrated vco for world tuning high performance pll for fast rds system integrated am-lna and pin diodes automatic self alignment for fm front-end pre- selection filter a nd image rejection integrated if filters with high selectivity, dynamic range and adaptive bandwidth control drift-free digital-if signal processing with high performance rds demodulation with group and block synchronization high performance stereo decoder with noise- blanker digital interface for hd radio? reception with digital audio blending fully programmable dsp core i 2 c bus-controlled i 2 s input/output digital audio interfaces single 5 v supply lqfp64 package description the TDA7706 highly integrated tuner is a high/performance am/fm tuner ic for car-radio applications, suitable for hd radio? reception. it contains mixers and if amplifiers for am, fm and wx, fully integrated vco and pll synthesizer, if- processing including adaptive bandwidth control, stereo-decoder, rds decoder, and digital interfaces for external hd radio? decoding on a single ic. am/fm iboc or drm base band filtering is available in parallel to standard analog reception. the utilization of digital si gnal processing results in numerous advantages against today's tuners: very low number of external components, very small space occupation and easy application, very high selectivity due to digital filters, high customization possibility th rough software control, automatic alignment and a powerful dsp for custom processing. '!0'03 lqfp64 table 1. device summary order code package packing TDA7706cb lqfp64 (10x10x1.4mm) tray www.st.com
contents TDA7706 2/16 doc id 022898 rev 3 contents 1 block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 function description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.1 fm - mixers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2 fm - agc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.3 am - lna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.4 am - agc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.5 am - mixers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.6 if a/d converters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.7 audio d/a converters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.8 vco . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.9 pll . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.9.1 tuner pll . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.10 crystal oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.11 dsp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.12 hd radio connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3 application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.1 basic application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
TDA7706 block diagram and pin description doc id 022898 rev 3 3/16 1 block diagram and pin description 1.1 block diagram figure 1. functional block diagram audio "lend control 6 &2%& 6#/ 0,, . !'# !$# !$# 3upply $!# /3# 34%2%/ $!# !udio/ut 35- .#/ 0,, -ain $30 !'# !- -(z 2$3 2$3 )# -%- )1"ase "and to)"/# decoder )3 )nout$igital "lend from decoder )"/# interf 32# 32# &- #ustom $30 '!0'03
block diagram and pin description TDA7706 4/16 doc id 022898 rev 3 1.2 pin description figure 2. pin connection (top view) '.$ 2& &--)8in &--)8in &-0).$dec &-0).$26 &--)8dec ,&ref '.$6#/ #+?3%, 4#!- 6## 2& ,.!out ,.!dec !--)8in !--)8in 6dig '.$slink 6##reg6 6reg6 6reg6 234. 2$3int 6## !$#?$!# $!#out2 $!#out, '.$ !$#?$!# '.$ 2%& 6refdec /3#out /3#in 6## 2%& 6$$)/6 6$$0,,6 '0)/ '0)/ '0)/ '0)/ '0)/ '0)/ 4est 6$$#/2%6 '.$6 '0)/ '0)/ 6## 0,, '.$ 0,, 0,,test 4#&- 46$!# '.$ ,.! ,.!in ,.!dec ,.!out ,.!in '0)/ '.$6 )#3#, )#3$! 6$$6 0).$in 0).$dec 4#!- ,& 6##6#/ '!0'03 table 2. pin description pin pin name i/o function description equivalent circuit 1fmpindrv out fm fm pin diode driver output 2 fmpinddec in integrated fm pindiode decoupling 3 fmmixdec - fm rf signal ground 4 fmmixin2 in fm mixer input 2 5 fmmixin1 in fm mixer input 1 6 gndrf - - rf power ground - ' !0'03 ' !0'03 ' !0'03
TDA7706 block diagram and pin description doc id 022898 rev 3 5/16 7 tcam - - am agc time constant 8 vccrf in - rf 5v supply - 9 ck_sel in - master/slave clock operation select 10 gndvco - vco vco ground - 11 lfref - loop filter reference - 12 lf1 - loop filter output - 13 vccvco in vco 5v supply - 14 tcam2 - am agc 2 nd order time constant 15 pinddec - am pin diode am agc internal pin diode decoupling 16 pindin - am agc internal pin diode input 17 gndlna - am lna am lna ground - 18 lnain in am lna input 19 lnadec - am lna decoupling 20 lnaout out am lna output - 21 lnain2 - am lna input 2 nd stage - table 2. pin description (continued) pin pin name i/o function description equivalent circuit ' !0'03 '!0'03 ' !0'03 '!0'03 ' !0'03 ' !0'03 ' !0'03
block diagram and pin description TDA7706 6/16 doc id 022898 rev 3 22 lnaout2 - am lna am lna output 2 nd stage 23 lnadec2 - am lna decoupling 2 nd stage 24 ammixin1 in am mixer inputs am mixer input 1 25 ammixin2 in am mixer input 2 26 gndslink - supply, ground and reset internal inter-ic communication bus ground - 27 vdig in front-end digital 5 v supply - 28 vccreg1v2 in internal 1.2 v regulator 5 v supply - 29 reg1v2 out internal 1.2 v regulator output 30 vreg3v3 out internal 3.3 v regulator output 31 rstn in reset (low active) pull-up 50 k ? to 3.3 v io supply 32 rdsint out rds interrupt output pull-down 50 k ? to ground - 33 i2csda in/out i 2 c interface i 2 c bus data pull-up 50 k ? to 3.3 v io supply 34 i2cscl in i 2 c bus clock pull-up 50 k ? to 3.3 v io supply 35 vdd3v3 in - io ring (3.3v) supply - 36 gnd3v3 - - io ring (3.3v) supply - table 2. pin description (continued) pin pin name i/o function description equivalent circuit ' !0'03 ' !0'03 ' !0'03 ' !0'03 '!0'03 '!0'03 '!0'03
TDA7706 block diagram and pin description doc id 022898 rev 3 7/16 37 gpio8 in/out hd radio connectivity/ audio output i2s interface sai clk pull-down 50 k ? to ground, sine_3v3_lin pad 38 gpio7 in/out audio sai word-select pull-down 50 k ? to ground, sine_3v3_lin pad 39 gpio6 in/out audio sai data-output pull-down 50 k ? to ground, sine_3v3_lin pad 40 gpio5 in/out audio sai data-input pull-down 50 k ? to ground, sine_3v3_lin pad 41 gpio4 in/out sai base-band clock pull-down 50 k ? to ground, sine_3v3_lin pad 42 gpio3 in/out sai base-band word-select pull-down 50 k ? to ground, sine_3v3_lin pad 43 gpio2 out sai base-band i data pull-down 50 k ? to ground, sine_3v3_lin pad 44 gpio1 out sai base-band q data pull-down 50 k ? to ground, sine_3v3_lin pad 45 gpio0 in hd blend pull-down 50 k ? to ground 46 gnd1v2 - - dsp core ground - 47 vdd core 1v2 in - dsp core 1.2v supply - 48 test in - test mode pull-down 50 k ? to ground 49 vddpll1v2 in - digital pll 1.2 v supply - 50 vddio1v2 in - internal inter-ic communication 1.2v supply - 51 vcc-ref in - front-end reference frequency and regulator 5 v supply - table 2. pin description (continued) pin pin name i/o function description equivalent circuit '!0'03 '!0'03 '!0'03
block diagram and pin description TDA7706 8/16 doc id 022898 rev 3 52 oscin in oscillator crystal oscilllator input - 53 oscout out crsystal oscillator output 54 gnd-ref - - front-end reference frequency and regulator ground - 55 vrefdec - - 3.3 v bias generation decoupling 56 gnd-adc_dac - dac ifadc and audio dac ground - 57 dacoutl out audio output left 58 dacoutr out audio output right 59 vcc-adc_dac in ifadc and audio dac 5v supply - 60 vcc-pll in pll tuning pll 5v supply - 61 gnd-pll - tuning pll ground - 62 plltest out pll test output 63 tcfm - - fm agc time constant 64 tvdac out - tuning voltage output - table 2. pin description (continued) pin pin name i/o function description equivalent circuit '!0'03 '!0'03 '!0'03 '!0'03 '!0'03
TDA7706 function description doc id 022898 rev 3 9/16 2 function description 2.1 fm - mixers the fm image rejection mixer has two single ended inputs, selectable through software. they are designed for achieving best performance both in case of a passive tuned preselection and for a passive fixed band-pass preselection without tuning for lower cost applications. the input frequency is down-converted to very low if with high image rejection. the tuned application is supported by an 8-bit tuning dac. the alignment of the dac is performed automatically on-chip. 2.2 fm - agc the programmable rfagc senses the mixer input to avoid overload. when the rfagc threshold is reached, the pin diode output is activated in order to attenuate the incoming rf signal the pin diode driver is able to drive external pin diodes with up to 15 ma current. the time constant of the fm agc is defined by the combination of an external capacitor and internal currents. there are two programmable attack and decay time constants. 2.3 am - lna the integrated am lna feature is integrated with low-noise and high iip2 and iip3. the gain of the lna is controlled by the agc. the maximum gain is set with an external resistor, typically 26 db with 470 ohm. 2.4 am - agc the programmable am rfagc senses the mixer inputs and controls the internal pin diodes and lna gains. firstly the lna gain is reduced by about 10d b, and then the pin diodes are activated to further attenuate the signal. the time constant of the 2 nd order am agc lpf is defined by both external components and programmable internal currents. 2.5 am - mixers the image rejection mixer has two am inputs selectable via software. it easily supports low- cost applications for extended frequency bands like short-waves. the input frequency is converted to low if with high image rejection.
function description TDA7706 10/16 doc id 022898 rev 3 2.6 if a/d converters a high performance iq-ifadc converts the if signal to the digital domain for subsequent digital signal processing. two fully differential, continuous-time sigma-delta ( ?? ) if-adcs are used for both the'i' path and the 'q' path. for each ifadc, two fully differential input nodes are fed with an input signal having a bandwidth up to 325 khz. this fully differential design provides good suppression of even-order harmonics. for complex filtering, the input signals of the 'i' path and the 'q' path have a 90 degree phase shift. the ifadc sampling frequency is 36.48 mhz. 2.7 audio d/a converters a cd-quality (>100db dr) stereo dac provides the left/right audio signals after if processing and stereo-decoding by the dsp. in presence of an external hd radio decoder the dac outputs the high quality audio resulting from the decoding of the hd radio transmissions. 2.8 vco the vco is fully integrated without any external tuning component. it covers all the fm frequency bands including eu, us, japan, east-europe, weather-band and the am-bands including lw, mw and sw. its center frequency is approximately 2.7 ghz. 2.9 pll 2.9.1 tuner pll the very high-speed tuning pll is able to settle within about 100 s for fast rds applications. the frequency step can be as low as 5 khz in fm and 500 hz in am. 2.10 crystal oscillator the device works with a 36.48 mhz fundamental tone crystal. the oscillator block diagram is shown in figure 3 . on the pcb the crystal must be connected as close as possible to the chip oscillator input and output pins of the chip. the intern al load capacitance together with pin and pad capacitance is optimized for fundamental tone crystal units at 36.48mhz. it is not recommended to put any additional external load capacitors. by suitably configuring pin #9 (ck_sel), the device can be operated as either a clock master or a clock slave. if pin 9 is left open or tied to gnd, the device is configured as clock master (typical operation mode). in case the device is configured as clock slave, pin 9 needs to be connected to 5v. then the crystal oscillator is sw itched off and the device expe cts a crystal equivalent signal on the oscout/oscin pins.
TDA7706 function description doc id 022898 rev 3 11/16 figure 3. crystal oscillator block diagram 2.11 dsp the TDA7706 embeds two dsp cores for high computational power and achievable customization. the first dsp and its hardware accelerators take care of all the tuner digital signal processing. the main program is fixed in rom. control parameters are copied to ram and they are accessible and modifiable there, thus allowing a parametric performance optimization. the first dsp core performs: digital down-conversion of if bandwidth selection with va riable controlled bandwidth fm and am noise blanking fm/am demodulation with soft-mute, high-cut, weak signal processing and quality detection fm stereo decoding with stereo-blend rds demodulation including error correction and block synchronization with generation of an rds interrupt for the main p autonomous control of rds-af tests self-alignment of pre-selection tuning the second dsp is totally free for custom processing implementation. the second (customizable dsp) can interact with the main dsp by tapping the signal at the access points as shown in the figure 4 below. !,# 2bias #lock buffer p p 8) 8/ internal external '!0'03
function description TDA7706 12/16 doc id 022898 rev 3 figure 4. secondary dsp signal access points in main signal path 2.12 hd radio connectivity the hit2 complies with hd radio interface spec ifications as per ibiquity's "rx_sss_1108 hd radio power efficient rf-if and peripheral pr ocessing (power ripp) specification", thus providing an external hd radio decoder with i/q base-band signals and receiving the decoded digital audio from it, as shown in figure 5 . figure 5. hd radio system architecture example -!).$30 &% !$ $$# $ )33 $%- ." 34%2%/ $%# ,0& $%#)- 7eak 3ignal 0roc ) 1 ) 1 ) , 2 , 2 1 k3s k3s k3s k3s k3s k3s -08 #534/-$30 , 2 !udio 0roc , 2 k3s , 2 )& ,ow )& ,ow )& -08 '!0'03 '!0'03 ($$ecoder 34! 4$! ""?#,+ ""?7#,+ "" ?) "" ?1 )3?#,+ )3 ?7#,+ )3?$ k3s !udio0roc "lended, 2 -(z blen d &-!- "lend $!#
TDA7706 application schematics doc id 022898 rev 3 13/16 3 application schematics 3.1 basic application schematic figure 6. fm wide-band application '!0'03 6 ?6 45. ?) #?3$! 45.?2$3).4 45.?)#?3#, 6?6 6##?2%& 6##?!$#?$!# 3!)?""?1 3 !) ? ""?73 6?6 6##?2& 6 ##?6# / 6?6 3!)?""?) & - !.4%.. ! !-!.4%..! ",%.$ 3!)?""?#,+ 3 !)?$) 3!)?73 3!)?!"#+ 3 !) ? $/ 45. ?2 34 . $!#/54?2 6##?$)' $!#/54?, '. $ 2 & '.$ 2& $ ) '?'. $ $)' ? ' .$ $)' ? ' .$ '.$ 2& '.$?! .! '.$?! .! '.$?! .! '.$?! .! '.$?! .! ' .$ 2& '. $ 2 & '.$ 2& '. $ ?!.! '.$ 2& $)' ? ' .$ '.$?! .! '.$ 2& '. $?! .! '.$ 2& $)' ? ' .$ $) '?'.$ $) ' ?'.$ '.$?! .! '.$?!.! $)' ? ' .$ $)' ? ' .$ $ )' ? '.$ '.$?! .! '.$?!.! '.$?! .! '.$?! .! '.$?! .! '.$?!.! n n n( n( n ( n ( n n n n u ( u ( +0 +0 n n u u n n p p n n n n n n n n n n -(z -(z n n n n n n n n ? +0 +0 n n n n n n p p n n n n u u p p u u n n n n &-?0).$26 &-?0 ). $dec &-?-)8dec &-?-)8?in & -?-)8 ? in '.$?2& '.$?,.! 4es t 46?$!# 4#? & - 0,,?test '.$?0,, 6##?0,, 6 ##?!$#? $ !# $ !# ? o ut2 $!#?out, '.$? ! $# ? $ ! # 62%&?dec ' .$?2 % & 8/ 8) 6##?2%& 6$$?)/?6 6$ $ ? 0, , ? 6 4 #?!- 6##?2& #,+?3%, '.$?6#/ ,&?ref ,& 6 ## ? 6# / 4 #!- 0).$?dec 0).$?in ,. ! ?in ,.!?dec ,.!?out ,.!?in , . !? o u t , . ! ?d ec !-?-)8?in !-?-) 8 ?in '.$?slink 6 ? $) ' 6##?2%'?6 62%'?6 62%'?6 234. 2$3?i n t 6$$?#o r e?6 '.$?6 '0)/? '0)/? '0)/? '0)/? '0)/? ' 0 )/? '0)/? '0)/? '0)/? '.$ ? 6 6$$?6 )#?3#, )#?3$! 4$! 4$! n n n n p p n n n n u u + + p p u( u( n n
package information TDA7706 14/16 doc id 022898 rev 3 4 package information in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. figure 7. lqfp64 (10x10x1.4mm) mechanical data and package dimensions '!0'03 /54,).%!.$ -%#(!.)#!,$!4 ! ! ! ! " # % $ % % $ $ e + " 41&0 , , 3eating0lane mm $)- mm inch -). 490 -!8 -). 490 -!8 ! ! ! " # $ $ $ e % % % , , + ?plq?plq?pd[ ccc ,1&0xxmm & ccc
TDA7706 revision history doc id 022898 rev 3 15/16 5 revision history table 3. document revision history date revision changes 07-mar-2012 1 initial release. 25-jun-2012 2 updated table 1: device summary on page 1 . 16-sept-2013 3 updated disclaimer
TDA7706 16/16 doc id 022898 rev 3 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 particul ar purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. st products are not designed or authorized for use in: (a) safety critical applications such as life supporting, active implanted devices or systems with product functional safety requirements; (b) aeronautic applications; (c) automotive applications or environments, and/or (d) aerospace applications or environments. where st products are not designed for such use, the purchaser shall use products at purchaser?s sole risk, even if st has been informed in writing of such usage, unless a product is expressly designated by st as being intended for ? automotive, automotive safe ty or medical? industry domains according to st product design specifications. products formally escc, qml or jan qualified are deemed suitable for use in aerospace by the corresponding governmental agency. 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. ? 2013 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 - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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