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application note tsh22 audio line driver AN873/0299 by s. laffont ? introduction this technical note describes an audio line driver using a tsh22.this integrated circuit exhibits a wide bandwidth (25mhz gain bandwidth product), low distortion and an output current sufficient to drive medium impedance loads at a high level of modulation. schematic the two tsh22 operators are used in non inverting mode with a gain settable by resistors. a single power supply is necessary ; two resistors (r4 & r6) are used to make a phantom ground at v cc /2. schematic diagram 1/3
figure 1 - photo plot (top view - not to scale) gain and bandwidth the overall gain for a frequency in the bandwidth is given by the two following equations : . gain channel 1 = (r1 + r2)/r1 . gain channel 2 = (r8 + r9)/r8 note that for gain equal or less than 40db (100 times) the high frequency bandwidth is far above the audio band (>>20khz) due to the 25mhz gain- bandwidth product of the tsh22 amplifier. the low frequency bandwidth is limited at the input by c1 (channel 1) and c7 (channel 2) : . fclin channel 1 = 1 2. p .r3.c1 . fclin channel 2 = 1 2. p .r5.c7 if the distributor is used with gain, the low frequency bandwidth is limited by the time constant r1.c6 (channel 1) or r8.c5 (channel 2). output load the load presented at the output of the distributor must have a minimum resistance of 100 w to avoid stability problems. if cables are used, it is recommended to drive them through resistors (serially connected with the out- put capacitors c2 & c8) whom value is equal to the characteristic impedance of these cables. power supply a power supply with a voltage between 8v and 30v is recommended. with a 12v supply, a 600 w im- pedance line can be driven at +10dbm with a distortion less than 0.05% @ 1khz application note 2/3
information furnished is believed to be accurate and reliable. however, stmi croelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result f rom its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or s ystems without express written approval of stmicroelectronics. ? the st logo is a trademark of stmi croelectronics ? 1999 stmi croelectronics C printed in italy C all rights reserved stmi croelectronics group of companies australia - brazil - canada - china - france - germany - italy - japan - korea - malaysia - malta - mexico - morocco the netherlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. ? http://www.st.com figure 2 - photo plot (top view - not to scale) application note 3/3

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Price & Availability of AN873

Part #	Manufacturer	Description	Price	BuyNow Qty.
N8740A/N8731A-831 47Y7344	Agilent Technologies Inc	N8740A/Power Cord, Usa, No Plug, 10Awg, 3-Wire, 8Ft (Input 230Vac 1 Phase) \|Keysight Technologies N8740A/N8731A-831	1: USD6765	0
N8734A/N8731A-208 61T6341	Agilent Technologies Inc	N8734A/Dc Power Supply 190-240V, 3 Phase Ac, 50/60Hz Input (Use With Line Cord Opt 861) \|Keysight Technologies N8734A/N8731A-208	1: USD6765	0
N8737A/N8731A-831/N8731A-230 10R2032	Agilent Technologies Inc	Power Supply, Dc, 60V, 3.3Kw; Power Supply Output Type:Programmable; No. Of Outputs:1 Output; Output Voltage Min:0V; Output Voltage Max:60V; Output Current Min:0A; Output Current Max:55A; Power Rating:3.3Kw; Supply Voltage Min:170Vacrohs Compliant: Yes \|Keysight Technologies N8737A/N8731A-831/N8731A-230		0
N8733A/N8731A-831/N8731A-230 10R2024	Agilent Technologies Inc	Power Supply, Dc, 15V, 3.3Kw; Power Supply Output Type:Programmable; No. Of Outputs:1 Output; Output Voltage Min:0V; Output Voltage Max:15V; Output Current Min:0A; Output Current Max:220A; Power Rating:3.3Kw; Plug Type:-; Height:88Mmrohs Compliant: Yes \|Keysight Technologies N8733A/N8731A-831/N8731A-230		0
N8742A/N8731A-831/N8731A-230 10R2042	Agilent Technologies Inc	Power Supply, Dc, 600V, 3.3Kw; Power Supply Output Type:Programmable; No. Of Outputs:1 Output; Output Voltage Min:0V; Output Voltage Max:600V; Output Current Min:0A; Output Current Max:5.5A; Power Rating:3.3Kw; Plug Type:- Rohs Compliant: Yes \|Keysight Technologies N8742A/N8731A-831/N8731A-230		0

Part #	Manufacturer	Description	Price	BuyNow Qty.
N8740A/N8731A-230/N8731A-831 17339.1	Keysight Technologies	Keysight N8740A/N8731A-230/N8731A-831 DC Power Supply, Single Output, 150 V, 22 A, 3.3 kW, N8700 Series	1: USD6765	3
N8735A/N8731A-208/N8731A-861 17683.1	Keysight Technologies	Keysight N8735A/N8731A-208/N8731A-861 DC Power Supply, Single Output, 30 V, 110 A, 3.3 kW, N8700 Series	1: USD6765	3
N8734A/N8731A-208/N8731A-861 17333.2	Keysight Technologies	Keysight N8734A/N8731A-208/N8731A-861 DC Power Supply, Single Output, 20 V, 165 A, 3.3 kW, N8700 Series	1: USD6765	5
N8732A/N8731A-230/N8731A-831 17331.1	Keysight Technologies	Keysight N8732A/N8731A-230/N8731A-831 DC Power Supply, Single Output, 10 V, 330 A, 3.3 kW, N8700 Series	1: USD6765	0
N8738A/N8731A-208/N8731A-861 20020416724517	Keysight Technologies	Keysight N8738A/N8731A-208/N8731A-861 DC Power Supply, Single Output, 80 V, 42 A, 3.36 kW, 3P, N8700 Series	1: USD6765	3

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