CC2400-RTR1 datasheet(15/84 Pages) TI2

15 / 84 page

CC2400

SWRS042A

Page 15 of 83

15 Circuit Description

LNA

DIGITAL

DEMODULATOR

- Digital RSSI

- Gain Control

- Image Suppression

- Channel Filtering

- Demodulation

DIGITAL

MODULATOR

- Data Filtering

- Modulation

- Power Control

On-chip

BIAS

DIGITAL

INTERFACE /

FIFO

AGC CONTROL

TX POWER CONTROL

TX/RX CONTROL

XOSC

16 MHz

ADC

DAC

FREQ

SYNTH

SmartRF ®

CC2400

Power

Control

Figure 2.

CC2400 simplified block diagram

A simplified block diagram of

CC2400 is

shown in Figure 2.

CC2400 features a low-IF receiver. The

received RF signal is amplified by the low-

noise amplifier (LNA) and down-converted

in quadrature (I and Q) to the intermediate

frequency (IF). At IF (1 MHz), the I/Q

signal is filtered and amplified, and then

digitized by the ADCs.

Automatic gain

control,

final

channel

filtering,

demodulation and bit synchronization is

performed digitally.

CC2400 outputs (in un-buffered mode only)

the digital demodulated data on the DIO

pin. A synchronized data clock is then

available at the DCLK pin. In buffered

mode the demodulated data is sent to a

FIFO and is accessible through the SPI

interface. RSSI is available in digital

format and can be read via the serial

interface. The RSSI also features a

programmable carrier sense indicator with

output on either GIO1 or GIO6.

In transmit mode the baseband signal is

directly up-converted quadrature (I and Q)

and then fed to the power amplifier (PA).

The TX IF signal is frequency shift keyed

(FSK). Optionally Gaussian filtering can be

used enabling GFSK. The BT of the

Gaussian filter is 0.5 for a datarate of

1 Mbps.

The internal T/R switch circuitry simplifies

the antenna interface and matching. The

antenna connection is differential. The

biasing of the PA and LNA is done by

connecting TXRX_SWITCH to RF_P and

RF_N through an external DC path.

The frequency synthesizer includes a

completely on-chip LC VCO and a 90

degrees phase splitter for generating the

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CC2400-RTR1 数据表(PDF) 15 Page - Texas Instruments

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