 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
TDA7317 Datasheet(PDF) 4 Page - STMicroelectronics |
|
||||||||||||||||||||||||||||||
TDA7317 Datasheet(HTML) 4 Page - STMicroelectronics |
|
|
4 / 12 page  DEVICE DESCRIPTION The TDA7317 is a five bands, digitally controlled stereo Graphic Equalizer. The device is intended for high quality audio ap- plication in Hi-Fi, TV and car radio systems where feature like low noise and THD are key factors. A mixed Bipolar Cmos Technology allows: Cmos analog switches for pop free commuta- tions, high frequency op.amp. (GWB = 10MHz) and high linearity polisilicon resistor for THD = 0.01 (at Vin = 1Vrms) and a S/N ratio of 102dB. The internal Block Diagram is shown on page 1. The first stage is a volume control. The control range is 0 to -17.625dB with 0.375dBstep. The very high resolution (0.375dB step) allows the implementation of closed loop amplitude con- trol system completely free from any acustical ef- fect (stepping variation and pumping effect). The volume control is followed by a serial five bands equalizer. Each filtering cell is the biquad cell shown in fig. 1 The internal resistor string is fixing the boost/cut value while the buffer makes the Q (quality factor) and central frequency, set by external compo- nents, fully indipendent from the internal resistors. Each filtering cell is realized using only 4 external components (2 capacitors and 2 resistors) allow- ing a flexible selection of centre frequency fo, Q factor and gain. Here below the basic formulae and the key features of each band pass filter are reported: fo = center frequency Gv = gain/loss at the center frequency fo Gv = 20log(Av) Q = fo f2 − f1 where f2,f1 = 3dB Bandwidth limits. Av = ( R2 ⋅ C2 )+(R2 ⋅ C1 ) + (R1 ⋅ C1 ) (R2 ⋅ C1 )+ (R2 ⋅ C2 ) Q = √ (R1 ⋅ C1 ⋅ R2 ⋅ C2 ) (R2 ⋅C1 )+ (R2 ⋅ C2 ) fo = 1 2 π ⋅√ (R1 ⋅ R2 ⋅ C1 ⋅ C2) If C1 is fixed, then: C2 = Q 2 Av − 1 − Q2 ⋅ C1 R2 = 1 2 π ⋅ C1 ⋅ fo ⋅ ( Av −1 ) ⋅ Q (Av − 1 − Q2) R1 = ( Av − 1)2 Av − 1 − Q2 ⋅ R2 Likewise, the components’values can be deter- mined by fixing one of the other three parameters. Referring to fig. 1 the suggested R2 value should be higher than 2K Ω in order to have a good THD (internal op. amp. current limit). Viceversa the R1 value should be equal or lower than 51K Ω in order to keep the ”click”(DC step) very low. A typical application is shown by fig. 2 Fig. 1 TDA7317 4/12 |
Similar Part No. - TDA7317 |
|
Similar Description - TDA7317 |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
