|
|
PDF AN97 Data sheet ( Hoja de datos )
| Número de pieza | AN97 | |
| Descripción | Telephone Tone Generator Requires No trimming | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AN97 (archivo pdf) en la parte inferior de esta página. Total 5 Páginas | ||
|
No Preview Available !
SIGNAL GENERATION CIRCUITS
Application Note 97: Jul 09, 1998
Telephone Tone Generator Requires
No Trimming
Many products that connect to phone lines (modems, for instance) incorporate a "call-
progress monitoring" function known as CPM. CPM circuits "listen" to the lines as a
human would, and respond according to what they "hear." You shouldn't dial a number
unless you first hear a dial tone, for example. Neither should your computer.
Tone accuracy is not very important when people monitor the call-progress tones, but the
use of computers for this purpose has produced a need for tone-accuracy specifications to
prevent errors in interpretation. Accordingly, CCITT has introduced the North American
Precise Audible Tone Plan (the following data is from the CCITT Green Book, Volume
VI-4):
Figure 1 illustrates a simple circuit for generating single or dual tones. They must be
±0.5% accurate in frequency, and they must be gated as shown in the "Cadence" column
www.maxim-ic.com/an97
Page 1 of 5
1 page  
Figure 3. In this frequency spectrum of the top trace in Figure 1, the highest-
amplitude spur (spurious frequency) is at least 54dB down from the twin-tone
level.
MORE INFORMATION
MAX293: QuickView -- Full (PDF) Data Sheet (360k) -- Free Sample
www.maxim-ic.com/an97
Page 5 of 5
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet AN97.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AN9012 | Induction Heating System Topology Review |  Fairchild |
| AN904 | MAGNETIC AMPLIFIER WITH LPR30 CONTROLLER |  STMicroelectronics |
| AN908 | APPLICATION NOTE |  ST Microelectronics |
| AN90B00 | Transistor Arrays |  Panasonic Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |