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NT2903 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - Single Chip FM Transceiver - ETC

भाग संख्या NT2903
समारोह Single Chip FM Transceiver
मैन्युफैक्चरर्स ETC 
लोगो ETC लोगो 
पूर्व दर्शन
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NT2903 pdf
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PRODUCT DESCRIPTION
The BiCMOS construction of the NT2903 CHIP-CEIVERTM provides a high level of
integration, with high performance operation and low power consumption. The CHIP-
CEIVERTM operates over an industrial temperature range of -20°C to +65°C and over the
supply voltage of +2.7 V to +3.3 V. The device is available in an industry standard plastic
package as a thin-quad flat package (TQFP).
FUNCTIONAL DESCRIPTION
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A functional block diagram of the NT2903 CHIP-CEIVERTM is shown in Fig.(1). The
receive section of the device consists of several major function blocks, including a
switchable RF input attenuator, quadrature mixer (down-conversion), differential to single-
ended buffers, PLL synthesizer / voltage controlled oscillator (VCO), I/Q low-pass filters,
variable gain amplifiers (VGA), DC offset correction circuitry, quadrature mixer (up-
conversion), zero-crossing detector, Period-to-Digital converter (P/D), Linearization ROM,
and a Digital-to-Analog converter (DAC). Additionally, the device contains a reference
crystal oscillator / automatic frequency control (AFC) circuitry. The transmit section of the
device consists of a PLL synthesizer / directly modulated voltage controlled oscillator
(VCO), and a RF power amplifier (PA).
RF IN
PAD
0/-10dB
RF OUT
(+1.5dBm)
BUF
LPF1
(I)
LPF2
(I)
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90
BUF
DC OFFSET
CORRECTION
DIV
90 SUM
IF
BPF
LPF1
(Q)
LPF2
(Q)
VGA
ZERO
X
Rx PLL
SYNTHESIZER/
VCO
P/D
DIV
512 X 9
ROM
Tx PLL
PA SYNTHESIZER/
VCO
REF
OSC
RSSI
AFC
9 BIT
DAC
CLOCK
DATA
AUDIO/DATA
LE INPUT
RSSI
OUTPUT
AFC
OUTPUT
Figure (1), NT2903 CHIP-CEIVERTM - Functional Block Diagram
AUDIO
OUTPUT
The receiver section of the NT2903 CHIP-CEIVERTM utilizes a quadrature mixer in a direct-
conversion, zero-intermediate frequency (zero-IF) approach. After quadrature down-
conversion and baseband filtering, a quadrature mixer up-converts the complex baseband
signal to an intermediate frequency (IF) for digitization. Direct conversion, (zero-IF) has
several advantages over super-heterodyne approaches. First, the problem of image is
eliminated because the IF is zero. Second, the use of active, low pass, filters provide a high
level of integration, while eliminating the need for external IF filters and IF transformers.
The digital data from the P/D converter is fed to a “brick wall” filter, which limits excess
receiver bandwidth, thereby improving receiver performance.
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