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march 2009 rev 2 1/16 AN2722 application note demonstration board user guidelines for the ts4601b high-performance stereo headphone driver introduction this application note concerns the ts4601b?s demonstration board, designed to evaluate the ts4601b, a high-performance stereo headphone driver with capacitor-less outputs and i 2 c interface from stmicroelectronics. this document provides: a brief description of the ts4601b device. a description of the demonstration board and all of its components. a description of the ts4601b control software provided. the layout of the demonstration board. figure 1. ts4601b demonstration board about the ts4601b the ts4601b is a stereo headphone driver dedicated to high audio performance and space-constrained applications. it is based on a low-power dissipation amplifier core technology. special care was taken in the design of the amplification chain to achieve peerless psrr (107 db typ. at 217 hz) and 101 db of snr. the ts4601b can drive at minimum 0.9 v rms output voltage into 16 and 1.6 v rms into 10 k , regardless of the power supply voltage, in the range of 2.9 to 5.5 v. an i2c interface is used to control the volume through 64 steps ranging from -60 db to +4 db and to configure the device in multiple modes. the traditionally-used output-coupling capacitors can be removed and a dedicated common-mode sense pin suppresses parasitic noise from the jack. the ts4601b is designed to be used with an outp ut serial resistor. it ensures unconditional stability over a wide range of capacitive loads. it is packaged in a ti ny 16-bump flip chip package with a pitch of 500 m and a 300-m diameter ball size. www.st.com
AN2722 2/16 the ts4601b has the following key features . power supply range: 2.9 to 5.5 v 107 db of psrr at 217 hz fully-differential inputs i2c interface for volume control digital volume control ra nge from -60 db to +4 db 101 db of snr a-weighted independent right and left channel shutdown control low quiescent current: 4.8 ma typ. at 3.0 v low standby current: 2 a max output coupling capacitors removed flip-chip package: 2.1 mm x 2.1 mm, 500 m pitch, 16 bumps refer to the datasheet for complete information on the ts4601b.
AN2722 description of the demonstration board 3/16 1 description of the demonstration board the ts4601b demonstration board is designed to help you evaluate the ts4601b audio differential input stereo headphone amplifier. the ts4601b device, in a flip chip package, is mounted on a four-layer pcb. an on-board rs-232 to i 2 c interface makes this board easy to control from a personal computer by using its serial port. the provided software controls all of the ts4601b?s features (gain, mode, mute, standby and register status). you can use the connectors on the demonstration board to directly control some of the features. the master standby of the ts4601b can be set directly by cn8 or, if the jumper is removed, by an external digital control (see ta bl e 1 ). by removing the jumpers on cn6 and cn7, you can disconnect the on-board i 2 c interface so that you can control the ts4601b by an external i 2 c bus interface. the -3 db cut-off input high-pass filter is set at about 6 hz (c4 to c7). if you want to change this frequency, you have to replace c4 to c7 at the same time. more information about these component calculatio ns is available in the ts4601b datasheet. the actual current consumption of the ts4601b can be measured directly by removing the jumper on cn3 and inserting a dc amperemeter in series. the overall current consumption of the demonstration board is higher than the consumption of the ts4601b because the cn1 power supply connector supplies the rs-232 to i 2 c adapter in addition to the ts4601b. table 1. demonstration board connectors connector description cn1 power connector (v cc and gnd). power supply voltage from 2.9 v to 5.5 v. cn2, cn9 fully-differential positive and negative input signal connectors (active input signal and gnd). by shorting one active input to gnd, you can use the demonstration board in single-ended input mode (refer to the ts4601b datasheet for more information). cn3 connector that allows direct measurem ent of ts4601b?s current consumption. remove the jumper and insert a dc amperemeter. cn4 left output connector (gnd and active signal). cn5 right output connector (gnd and active signal). cn6, cn7 scl and sda connectors: ? pins shorted, ts4601b is controlled by the on-board rs 232 to i 2 c interface. ? pins unshorted, ts4601b can be controlled by an external i 2 c bus. cn8 standby control connector: ? when pins 1 and 2 are shorted, the ts4601b is in operation mode. ? when pins 2 and 3 are shorted, the ts4601b is in master standby mode. the connector pins are connected as follows: ? pin 1 to v cc ? pin 2 to sdz of the ts4601b ? pin 3 to gnd
description of the demonstration board AN2722 4/16 caution: when you apply the power supply through cn1, do not invert the polarity as this will damage the u1 amplifier. j1 3.5 mm stereo headphone plug. j2 db9 female connector enabling connectio n of the demonstration board to the rs-232 serial port. table 1. demonstration board connectors (continued) connector description
AN2722 description of the demonstration board 5/16 figure 2. schematic diagram 3 4 14 1 3 u2b kp1040 5 6 12 11 u2c kp1040 1 2 16 15 u2a kp1040 1 6 2 7 3 8 4 9 5 j2 db 9 gnd2 gnd2 vcc gndp gndp gndp gndp gnd2 gnd rt s d s r txd dtr r 3 1k r 9 1k r6 10k r7 10k r 8 2k2 t1 b s 170 d1 1n414 8 d2 1n414 8 r5 100 c2 1 u f c 3 1 u f c 8 2.2 u f c1 1 u f gndp gndp gndp gnd gnd r2 12 r1 12 c 9 2.2nf c10 2.2nf gnd gnd cn5 c4 2.2 u f c5 2.2 u f c7 2.2 u f c6 2.2 u f gnd gnd 1 2 3 cn 8 s td b y gndp vcc gndp vcci2c vcc gnd cn4 1 2 3 j1 gnd gnd vcci2c cn2 left inp u t cn 9 right inp u t cn6 s cl cn7 s da cn1 power cn 3 gndp left o u tp u t right o u tp u t vcc s da s cl s cl s da r4 1 8 0 + - + - + - + - i2c neg a tive su pply neg a tive reg po s itive reg pvcc gnd c1 c2 s da s cl vcc inl- inl+ inr+ inr- vo u tl vo u tr cm s pv ss b4 b3 b2 b1 a4 a3 a2 a1 c4 c3 c2 c1 d4 d3 d2 d1 s dz u1 t s 4601 r s 2 3 2 to i2c converter t s 4601 m a in a pplic a tion
description of the demonstration board AN2722 6/16 table 2. component list for the demonstration board name quantity description c1, c2, c3 3 1 f/10v x5r, smd ceramic capacitors, 0603 c4, c5, c6, c7, c8 5 2.2 f/10v x5r, smd ceramic capacitors 0603 c9, c10 2 2.2 nf/50v x7r, smd ceramic capacitors, 0603 cn1, cn3, cn4, cn5, cn6, cn7 6 2-pin header 2.54 mm pitch cn8 1 3-pin header 2.54 mm pitch cn2, cn9 2 4-pin header 2.54 mm pitch d1, d2 2 1n4148, j1 1 3.5 mm stereo pcb headphone jack connector j2 1 pcb 90 female db9 connector r1, r2 2 12 /1% smd resistor, 0603 r3, r9 2 1 k /1% smd resistor, 0603 r4 1 180 /1% smd resistor, 0603 r5 1 100 /1% smd resistor, 0603 r6, r7 2 10 k /1% smd resistor, 0603 r8 1 2.2 k /1% smd resistor, 0603 t1 1 bs170 u1 1 ts4601beij u2 1 kp1040, tlp521-4(gb)
AN2722 demonstration board layout 7/16 2 demonstration board layout the following figures show the layers and the top view of the demonstration board. figure 3. pcb top layer pcb mid layer 1 figure 4. pcb mid layer 2 pcb bottom layer
demonstration board layout AN2722 8/16 figure 5. top view of the demonstration board
AN2722 ts4601b demonstration software 9/16 3 ts4601b demonstration software the ts4601b demonstration software provides a quick and easy way of driving the ts4601b audio system from a pc, and in particular, of configuring the output mode and the volume. the software is located on the cdrom provided with the demonstration board. the latest revision of this software is available on the st web site at www.st.com . it runs under ms windows 95/98/me/2000/xp. the pc must have a serial port available. if not, a usb-to-serial adapter can be used but note that the compatibility wit h all adapters available on t he market has not been tested. 3.1 connecting the demonstrat ion board and starting the software follow these steps to drive the ts4601b from a pc. 1. use a db9 female to db9 male rs-232 cable to connect the pc to the ts4601b demonstration board on j2. 2. connect the power supply v cc to cn1, and set the jumper on cn8 to short pin 1 and pin 2. 3. verify that cn3, cn6 and cn7 are shorted. 4. connect the modulation source to cn2 and cn3, and plug a headphone into j1. 5. copy the ts4601b demonstration board program board.exe provided on the cdrom onto the hard drive of your pc and launch it by double-clicking on it (no installation needed, you can just copy it). the software dialog box shown in figure 6 is displayed.
ts4601b demonstration software AN2722 10/16 figure 6. ts4601b demonstration software main window 6. choose the appropriate com port from the port area or click auto detect for the program to select the com port automatically. when the port status indicator turns to green, the program is ready to send commands to the ts4601b. in some rare cases, when auto detect is used, a com port is chosen ( port status is green) but it is not the right one. if this happens, manually force the right com port by clicking directly into the port box. note: the com port where the device is connected must be in the range of com1 to com8. if this is not the case, change the com port number in windows by selecting start>control panel>system>hardware>device manager. 3.2 using the ts 4601b software in the main window of the ts4601b demonstration software shown in figure 6 , on the left side the following features are available. mode select buttons allow you to select the ts4601b output mode. the diagram located in the middle of the window summarizes the mode currently selected and shows which inputs and outputs are active. the indicator located to the right of each output mode lights up when the mode is active. figure 7 shows an example of this window when the software is in operation. serial port selection mute buttons output mode buttons read internal re g isters menu software exit button volume control cursor actual volume indicator internal ts4601 diagram: changes when output mode chan g es
AN2722 ts4601b demonstration software 11/16 figure 7. ts4601b main window in operating mode mute buttons allow you to set the ts4601b output to mute or operating mode. when the indicator located to the right lights up in green, the channel mute is active. read internal register menu when you click on this menu, the ts4601b internal registers pop-up window is displayed (see figure 8 ). by clicking on the read internal registers button, you can display the actual state of the ts4601b. hexadecimal values of cr0 to cr4 registers are also displayed. by pressing the clear results button, all results disappear and you need to press again the read internal registers button for a new display. note that this window remains open until you close it by clicking on the cross in the upper right corner. note also that this window is not automatically refreshed. if you change the output mode or something else in the main window, you have to press again the read internal registers button to display the new ts4601b settings.
ts4601b demonstration software AN2722 12/16 figure 8. ts4601b main window + register status window in the main window of the ts4601b evaluation software shown in figure 6 , on the right side the following feature is available. volume control cursor by dragging this cursor up and down, you can control the ts4601b?s output volume. the actual gain set is displayed in the gain box. to exit the program, just click the exit button on the bottom right or click the cross in the upper right corner of the window. note: occasionally, problems may arise when trying to drive the demonstration board using certain notebook or laptop pcs and the rs-232 output.
AN2722 ts4601b demonstration software 13/16 3.3 common error messages no acknowledge for address you pressed an output mode button and the software displays an information pop-up window that indicates ?error: no acknowledge for address!? (see example in figure 9 ). this error message can have several causes. you set the device in master standby mode. either cn8 between 2 and 3 or the sdz pin were left floating. the power supply is down or disconnected from cn1. one or several jumpers are missing on cn6 or cn7. the serial cable is disconnected from j2. the jumper on cn3 is missing and there is no amperemeter in series. figure 9. ts4601b acknowledge pop-up message results displayed in internal registers window are different from main window you pressed the read internal registers button in the ts4601b internal registers window, and results displayed are different from what the main window indicates (see figure 10 ). the main window is not automatically refreshed, therefore, this case can appear if, while the software is running, you switch the ts4601b power supply off and on or set the ts4601b to master standby (by setting the pin sdz to "0") and set it back again to i 2 c standby (sdz to level "1"). when you do this, the ts4601b is reset and all internal registers are set to their initial value. this is why, when you press the read internal registers button, the result displayed is quite different from the display in the main window. pressing again one of the output mode buttons or just changing the volume is enough to re- start the ts4601b without closing and re-starting the software.
ts4601b demonstration software AN2722 14/16 figure 10. uncorrelated windows in ts4601b evaluation software
AN2722 revision history 15/16 4 revision history table 3. document revision history date revision changes 17-apr-2008 1 initial release. 13-mar-2009 2 minor text changes. changed part number from ts4601 to ts4601b.
AN2722 16/16 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. ? 2009 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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