CMT2210LW データシートの表示（PDF） - Unspecified

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CMT2210LW

Low-Cost 315/433.92 MHz OOK Stand-Alone Receiver

Unspecified 

CMT2210LW

Table 8. Modulation, Frequency and Symbol Rate

Parameter

Demodulation

Frequency

Frequency Resolution

Symbol Rate

Value

OOK

315/433.92

24.8

0.1 to 3.4

Unit

-

MHz

Hz

ksps

5.3 Main Configurations

Unlike other NextGenRFTM receivers, the CMT2210LW does not need any register control or manufacturing programming. The

configuration of the device is fixed in order to save the development effort, reduce system cost and simplify the manufacturing

process. The main configurations are listed in the table below. Please note that if more flexibility is needed in the system, the user

can use other NextGenRFTM receivers like CMT2210AW and etc. For those products, an embedded EEPROM is available on

chip for the user to configure all the product features.

Table 9. CMT2210LW Main Configurations

Parameters

RF Settings

Frequency

Modulation

Symbol Rate

Receiver Bandwidth

Xtal Stabilizing Time

Operation

Settings

OOK Settings

Sleep Time

Rx Time

Demod Method

Fixed Demod TH

CMT2210LW-ESR

315/433.92

OOK

0.1 – 3.4

200

310

3

2000

Fixed TH

60

Unit

MHz

-

ksps

kHz

us

ms

ms

-

-

5.4 Internal Blocks Description

5.4.1 RF Front-end and AGC

The CMT2210LW features a low-IF receiver. The RF front-end of the receiver consists of a Low Noise Amplifier (LNA), I/Q mixer

and a wide-band power detector. Only a low-cost inductor and a capacitor are required for matching the LNA to any 50 Ω

antennas. The input RF signal induced on the antenna is amplified and down-converted to the IF frequency for further

processing.

By means of the wide-band power detector and the attenuation networks built around the LNA, the Automatic Gain Control (AGC)

loop regulates the RF front-end’s gain to get the best system linearity, selectivity and sensitivity performance, even though the

receiver suffers from strong out-of-band interference.

5.4.2 IF Filter

The signals coming from the RF front-end are filtered by the fully integrated 3rd-order band-pass image rejection IF filter which

achieves over 25 dB image rejection ratio typically. The IF center frequency is dynamically adjusted to enable the IF filter to

locate to the right frequency band, thus the receiver sensitivity and out-of-band interference attenuation performance are kept

optimal despite the manufacturing process tolerances. The IF bandwidth is fixed at 200 kHz.

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