for FM & Communication
ThumbnailType and Description Type Frequency Range Murata Discriminator (P/N)
1 JT10.7M Series - For FM Dip 10.7 MHz CDA10M7 Token JT10.7M For FM (Compatible to Murata Discriminator CDA 10.7) are resonated devices that offer adjustment free audio detection in both wide and narrow bandwidths. Discriminator can be customed designs and tighter tolerances available on request. Application of specific designs also available including different piezo band-pass devices and Q specifications adjusted to frequency requirements.
Download JT10.7M Series PDF (320KB)
2 JTCV10.7M Chip Series - For FM Chip 10.7 MHz - Token JTCV10.7M For FM are resonated devices that offer adjustment free audio detection in both wide and narrow bandwidths. Token takes advantages of chip ceramic discriminators which convert the changes in frequency into an audio signal via the various detection methods based on impedance or phase characteristics of piezoelectrics technology. The incorporation of piezoelectrics technology allows the product's function and feature set to be easily configured via surface mount installation.
Download JTCV10.7M Series PDF (320KB)
3 JTC Surface Mount Series - for Communication Chip 455 KHz CDBC Token JTC for Communication (Compatible to Murata Discriminator CDBC) consists of wide band piezoelectric resonator. It is ideal for mobile communication equipments due to its small size and light weight. Token chip discriminator JTC series is a central player in providing small low-cost low-power semiconductors to aid the deployment of communication products. The incorporation of piezoelectrics technology allows the product's function and feature set to be easily configured via surface mount installation.
Download JTC Series PDF (281KB)
4 JTM Series - for Communication Dip 455 KHz CDB/CDBC/CDBM Token JTM for Communication (Compatible to Murata Discriminator CDB/CDBC/CDBM) consists of wide band piezoelectric resonator. It is ideal for mobile communication equipment due to its small size and light weight. Token JTM including features with small in size and lightweight, realize non-adjustment in detection circuit, high sensitivity and stability, wide range of standard products are available for various ICs, operating temperature range: -20°C to +80°C and storage temperature range: -40°C to +85°C.
Download JTM Series PDF (271KB)
What is Discriminator?
The discriminator functions to convert the change of the frequency into audio frequency, an unique system of detection only used for FM broadcasting. The detection of FM wave is made through the circuit in which the relation between the frequency and the output voltage is linear. FM wave detection methods as known as ratio detection, Foster-Seeley detection, quadrature detection, differential peak detection, etc.
FM Wave Detection Methods
Ratio detection is the most popular method in use at present. The impedance characteristic of a ceramic resonator is designed into the circuit, then a coil as a detector is unnecessary. The fact is that adjustment is eliminated.
This detection method was originally developed as a sound detector for TV sets, but recently it has become popular in the consumer market (FM tuners, car radios, etc.).
The Quadrature Detection Method utilizes the phase characteristic.
An FM signal is supplied directly to one side of the multiplier's input with an IC to the other side of the multiplier’s input an FM-IF signal, which is passed through the phase shifting circuit mainly composed of a tank circuit tuned to FM-IF, is applied. By taking advantage of the phase characteristic of the ceramic resonator as a discriminator, we can eliminate adjustment of the FM-IF circuit.
Differential Peak Detection
This detection method was developed by RCA as a sound detector for TV sets. The method has following features.
- Can output large level.
- Can function with only 1 synchronous coil.
Non-linearities of synchronous characteristics are compensated each other by applying rectified intermediate frequency voltage. Thus, linearity can be obtained.
Advantage of Token Piezoelectric Ceramics
Token Electronics had been able to develop specialized piezo materials which when combined with an advance design have resulted in a complete line of practical, inexpensive piezo devices for entertainment and communications applications.
Token reliably deliver high-quality components according to the each customer special needs with respect to performance, costs, and technology modifications.
For marketing discontinuations or sourcing activities concerning Piezoelectric Discriminator products, you are encouraged to contact our Sales Department so the request can be properly directed within Token.
Token Ceramic Discriminator Catalogue in PDF file (448KB) is available to download.