データシートサーチシステム |
|
SL6659 データシート(PDF) 5 Page - Zarlink Semiconductor Inc |
|
SL6659 データシート(HTML) 5 Page - Zarlink Semiconductor Inc |
5 / 15 page 3 SL6659 Fig. 3 Internal schematic GENERAL DESCRIPTION The SL6659 is a very low power, high performance integrated circuit intended for IF amplification and demodulation in FM radio receivers. It comprises: q A mixer stage for use up to 200MHz q A limiting amplifier operating up to 1·5MHz q A quadrature detector with AF output q An RSSI (Received Signal Strength Indicator) output Mixer The Mixer is single balanced with an active load. Gain is set externally by the load resistor, although the value is normally determined by that required for matching into the ceramic filter. It is possible to use a tuned circuit but an increase in mixer gain will result in a corresponding reduction of the mixer input intercept point. The RF input is a diode-biased transistor with a bias current of typically 300µA. The LO input is differential but would normally be driven single-ended. Special care should be taken to avoid acciden- tal overload of the local oscillator input. IF Amplifier The limiting amplifier is capable of operation to atleast 1MHz and the input impedance is set by an external resistor to match the ceramic filter. Because of the high gain, pins 11 and 12 must be adequately bypassed. Detector A conventional quadrature detector providing audio output is fed internally from the IF amplifier; the quadrature input is fed externally using an appropriate capacitor and phase shift network. RSSI Output The RSSI output is a current source with value proportional to the logarithm of the IF signal amplitude. There is a small residual current due to noise within the amplifier (and mixer) but beyond this point there is a measured and guaranteed 70dB dynamic range. The typical range extends to 92dB, independent of frequency, and with exceptionally good temperature and supply voltage stability. Supply Voltage The SL6659 will operate reliably trom 2·5V to 7·5V. The supply line must be decoupled with 470nF using short leads. Internal Bias Voltage The internal band-gap reference must be externally decoupled. It can be used as an external reference but must not be loaded heavily; the output impedance is typically 14 Ω.. |
同様の部品番号 - SL6659 |
|
同様の説明 - SL6659 |
|
|
リンク URL |
プライバシーポリシー |
ALLDATASHEET.JP |
ALLDATASHEETはお客様のビジネスに役立ちますか? [ DONATE ] |
Alldatasheetは | 広告 | お問い合わせ | プライバシーポリシー | リンク交換 | メーカーリスト 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 |