XE1218A Просмотр технического описания (PDF) - Unspecified

Номер в каталоге

Компоненты Описание

производитель

XE1218A

Low power single die FM receiver

Unspecified 

Datasheet XE1218A: Low

Power single die FM receiver

6. Application information

6.1 Recommended crystal oscillator

The recommended characteristics of the crystal used for generating the local oscillator frequency (LO) are the

following:

- Supplier: Telequarz

- Type: HSLX5132

- Frequency: 160.325 MHz (7th overtone)

- Motional capacitance Cs = 0.2 fF ± 0.15 fF

- Calibration tolerance at 25 °C: ± 10 ppm

- Stability over temperature range: ± 5 ppm

- Ageing in the first year: ± 3 ppm

6.2 Using a low impedance audio output

The XE1218A provides two possible audio outputs: a) direct connection to an earphone and b) a high

impedance line out (10kΩ). Should a low impedance output be required to interface with an audio post

processing stage, this output can be matched by using the EAR output of the XE1218A. The adaptation should

be as follows:

EAR

Low impedance line out

1kΩ

6.3 Using the high impedance line out OUT

If the line out OUT pin is used on the XE1218A to interface to an analog audio post processing circuit such as a

sound de-compounder or external power amplifier, a de-coupling capacitor must be connected to the pin AUD

of the XE1218A. Please note that this capacitor is only necessary when the system uses the OUT connection.

When the internal amplifier is used and an earphone is directly connected to the output EAR, the pin AUD must

not remain connected.

4.7nF-5%

AUD

OUT

High impedance line out (10kΩ)

10

D0204-157

Share Link: