DataSheet.es    


PDF NT2903 Data sheet ( Hoja de datos )

Número de pieza NT2903
Descripción Single Chip FM Transceiver
Fabricantes ETC 
Logotipo ETC Logotipo



Hay una vista previa y un enlace de descarga de NT2903 (archivo pdf) en la parte inferior de esta página.


Total 27 Páginas

No Preview Available ! NT2903 Hoja de datos, Descripción, Manual

www.DataSheet4U.com
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
DataSheet4U.com
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.
DataShee
DataSheet4U.com
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
DataSheet4 U .com
5551 Ridgewood Drive, Suite 303
Naples Florida 34108
Phone: (941) 591-8008 FAX: (941) 591-8704
4Q/99REV(A)

1 page




NT2903 pdf
www.DataSheet4U.com
et4U.com
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.
DataSheet4U.com
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
DataShee
DataSheet4U.com
DataSheet4 U .com
5

5 Page





NT2903 arduino
www.DataSheet4U.com
et4U.com
PIN DESCRIPTIONS - Cont.
SUBS*
(37)
Substrate: This pin is connected to the silicon substrate and
should be connected to a “clean” ground plane.
*This pin shall become a modulation input for utilization of
the separate modulation varactor in future versions if
required.
VSSR
(38)
Receive VCO ground: This is the ground pin for the
internal receive voltage controlled oscillator and receive PLL
charge pump. This pin should be connected to an RF ground
plane using through-hole vias.
RPLL
(39)
Receive Voltage Controlled Oscillator: This pin connects
to an external PLL loop filter. This filtered tuning voltage
provides the tuning voltage for the internal varactor tuning
diodes. The PLL loop dynamics are controlled by the loop
filter component values.
VDDR1
VDDR2
(40,43)
Receive VCO power supply: These are the power supply
pins for the internal receive voltage controlled oscillator and
receiveDPatLaLShceheatr4gUe.cpoummp. These pins should be de-coupled
to ground, as close to each pin as possible, with RF quality
100pF and 1.0nF ceramic capacitors.
RVCO
/RVCO
(41,42)
Receive VCO Tank: These single-end outputs drive the
external, balanced, RxVCO resonant tank circuit. The tank
circuit generates the overall oscillation frequency for the
RxVCO. The RxVCO tank frequency is 2X the desired Rx
LO frequency, since the on-chip quadrature generation
circuitry divides this LO signal by 2. The CHIP-CEIVERTM is
a direct conversion, zero-IF receiver, therefore the quadrature
LO frequency is the same as the receive frequency, (i.e. no IF
offsets). Careful layout is required to prevent RF leakage to
the TxVCO tank circuit and associated transmit circuitry.
IFSET
(44)
IF Filter: This pin connects to an external resistor, which sets
the corner frequencies of the IF transconductance (gm) filter
stages.
ACGND (45)
AC Ground: This pin connects to an external 100 nF
capacitor connected to VSSA, which provides de-coupling
for the internal baseband and IF filter ground nodes.
DataSheet4U.com
DataSheet4 U .com
11
DataShee

11 Page







PáginasTotal 27 Páginas
PDF Descargar[ Datasheet NT2903.PDF ]




Hoja de datos destacado

Número de piezaDescripciónFabricantes
NT2903Single Chip FM TransceiverETC
ETC

Número de piezaDescripciónFabricantes
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


DataSheet.es    |   2020   |  Privacy Policy  |  Contacto  |  Buscar