AT86RF211DAI-R datasheet(14/48 Pages) ATMEL

tên linh kiện	AT86RF211DAI-R

Giải thích chi tiết về linh kiện	FSK Transceiver for ISM Radio Applications

PDF	48 Pages

Scroll/Zoom	100%

nhà sản xuất	ATMEL [ATMEL Corporation]

Trang chủ	http://www.atmel.com

Logo

14 / 48 page

AT86RF211

1942C–WIRE–06/02

Figure 16. LC Band-pass Filter

•

10 nF capacitors cut DC response forward and backward.

•

The first network has the low cut-off frequency.

•

The second network has the high cut-off frequency.

IF2 Amplifier Chain

The input impedance of the IF2 amplifier is 1700

Ω. This value enables the use of popu-

lar filters with impedance between 1500

Ω and 2000Ω. It is directly connected to the FSK

demodulator. The bandwidth is internally limited to 1 MHz to minimize the noise before

the discriminator. It acts like a band pass filter centered at 455 kHz with capacitive cou-

pling between stages of amplifier and mixer. Total voltage gain is typically 86 dB.

Thanks to the capacitive coupling, no slow DC feedback loop is needed enabling a fast

turn on time. IF2DEC has to be decoupled with at least 2.2 nF.

Figure 17. Input of the IF2 Amplifier Schematic

10 nF

~ F1

~ F2

40 kHz or higher

global response

Filter

gain

Frequency

1900

Ω

IF2IN

IF2DEC

AT86RF211DAI-R bảng dữ liệu(PDF) 14 Page - ATMEL Corporation