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What is NT2903?

This electronic component, produced by the manufacturer "ETC", performs the same function as "Single Chip FM Transceiver".


NT2903 Datasheet PDF - ETC

Part Number NT2903
Description Single Chip FM Transceiver
Manufacturers ETC 
Logo ETC Logo 


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CHIP-CEIVERTM - Single Chip FM Transceiver
902 - 928 MHz
FEATURES
NT2903
Direct-Conversion, Zero-IF, Architecture
Wide Bandwidth FM Transceiver
Suitable for FM/FSK Modulation
Dual, On-Chip PLL Synthesizers/VCOs
3-wire serial interface
System Noise Figure 4.7 dB (typ.)*
2.7 - 3.3V Operation / Standby Mode
No Tune "Tankless" Detector
RF Output +1.5 dBm
Low Cost, Thin-Quad Flat Package, (TQFP-48)
APPLICATIONS
Analog/Digital "900 MHz" Cordless Phones
Telemetry/Data Radios
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Wireless Local Area Networks (WLAN)
ISM Band (900 MHz) Wireless Products
GENERAL DESCRIPTION
The NT2903 CHIP-CEIVERTM is a complete, single chip, FM transceiver solution, which will
operate in any 24 MHz band from 800-1000 MHz, including the Industrial Scientific Medical
(ISM) band (902-928 MHz). Utilizing a unique direct-conversion, zero-intermediate frequency
(zero-IF) receiver architecture, the NT2903 CHIP-CEIVERTM provides radio designers with a
"simple" RF path design solution. The device is fabricated as a monolithic, BiCMOS, integrated
circuit. The device's receiver section provides all of the required RF synthesis, filtering, gain
control, AFC, and demodulation functions. The transmitter section contains a directly modulated
VCO and RF power amplifier (PA). Internal, dual, high-performance phase locked loop (PLL)
synthesizers/VCOs allow full-duplex Tx/Rx operation over the entire RF tuning range. Tuning,
power management, and gain control functions are accomplished via a 3-wire serial interface.
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Information furnished by NUMA Technologies is
believed to be accurate and reliable. However, no
responsibility is assumed by NUMA Technologies for
its use; nor for any infringements of patents or other
rights of third parties, which may result from its use.
No license is granted by implication or otherwise under
any patent or patent rights of NUMA Technologies.
NUMA Technologies
* Refer to Applications section for additional details
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5551 Ridgewood Drive, Suite 303
Naples Florida 34108
Phone: (941) 591-8008 FAX: (941) 591-8704
4Q/99REV(A)

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FUNCTIONAL DESCRIPTION - Cont.
AFC – Automatic Frequency Control of the receive local oscillator (LO) frequency is used
to improve receiver performance. Without AFC, frequency offsets cause a reduction in
SINAD due to filter distortion. A reduction in SINAD of 4-5dB is typical at a frequency
offset of ±20kHz. Additionally, due to the zero-IF architecture of the NT2903 AFC is used
to reduce beat note levels.
The AFC correction voltage, which is generated internally in the NT2903, is available as a
DC voltage at the AFC (46) output pin. This correction voltage is typically used to bias an
external varactor, which is parallel to the input load capacitor of the reference oscillator
circuit. The AFC correction voltage is derived by double integration of the demodulated
FM signal. The AFC attack time is governed by two factors; an external capacitor
connected to the AFCC (47) pin and a loop damping resistor and capacitor at the output pin
of the AFC (46) output pin.
Comparator - A high speed BiCMOS comparator performs the basic function of a
"Limiter" and is used to detect the intermediate frequency (IF) zero-crossing events. The
"half-cycle" intervals of the IF are output from the comparator in the form of a pulse, which
is subsequently measured by the Period-to-Digital (P/D) converter. Complimentary
outputs from the comparator provide alternating "half-cycle" gating signals to the P/D
converter.
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Period-to-Digital (P/D) Converter - The quantizer used in the CHIP-CEIVERTM employs
the NUMA Technologies' Period-to-Digital (P/D) converter as the digitizer. The basic
principal of the P/D relies on it's ability to integrate and dump sequential half-cycle
intervals of the IF signal with high resolution. The numerical output from the P/D is the
form of 1/f or period of the intermediate frequency (IF) signal.
The clock signal for the P/D is derived from the RxVCO oscillator. A functional block
diagram of the P/D clock generation is shown in Fig. (2).
"902.3 MHz"
from RxVCO
PLL Loop
UC Mixer LO
/11 /2 /18 Generation
/16
P/D Clock
82.02 MHz
UC Mixer LO
142.4 kHz
Figure (2), P/D Converter Clock Generation - Functional Block Diagram
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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for NT2903 electronic component.


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