RF133 Просмотр технического описания (PDF) - Conexant Systems
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RF133 Datasheet PDF : 17 Pages
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RF/IF Transceiver
RF133
Pin #
1
2
Name
GND
TLCPO
3
VCC
4
VCC
5
GND
6
TXIFIN+
7
TXIFIN–
8
GND
9
TXI+
10 TXI–
11 TXQ+
12 TXQ–
13 TXMO+
14 TXMO–
15 RXI+
16 RXI–
17 RXQ+
18 RXQ–
19 T/H
20 CTH1
21 CTH2
22 GND
23 LO2O+
24 LO2O–
Table 1. RF133 Signal Descriptions
Description
Ground (Tx phase detector/charge pump)
Translation loop charge pump output
Pin #
25
26
Name
VCC
LPFADJ
Supply (phase detector and charge pump)
Supply (Tx modulator, Rx baseband sections)
Ground (Tx modulator, Rx baseband sections)
Tx IF input
Tx IF input
Ground
Tx modulator input
Tx modulator input
Tx modulator input
Tx modulator input
Tx modulator output
Tx modulator output
Rx baseband output
Rx baseband output
Rx baseband output
Rx baseband output
Track and hold signal
Capacitor for track and hold
Capacitor for track and hold
Ground (2nd LO output buffers)
2nd local oscillator output
2nd local oscillator output
27 VCC
28 RES1
29 RES2
30 VCC
31 GND
32 BPC
33 SXENA
34 RXIFF–
35 RXIFF+
36 DATA
37 CLK
38 LE
39 RXENA
40 RXIFIN–
41 RXIFIN+
42 GND
43 LO1IN–
44 LO1IN+
45 VCC
46 TXRFIN–
47 TXRFIN+
48 TXENA
Description
Supply (2nd LO output buffers)
Adjustment pin for baseband low pass filter corner
frequency
Supply (2nd LO)
Resonator pin
Resonator pin
Supply (2nd LO)
Ground (2nd LO)
Bypass capacitor
Synthesizer enable
Rx IF filter pin
Rx IF filter pin
Data input
Clock input
Latch enable input
Receiver enable
Rx IF input
Rx IF input
Ground (Tx mixer, Rx IF sections)
1st local oscillator input
1st local oscillator input
Supply (Tx mixer, Rx IF sections)
Transmit RF input
Transmit RF input
Transmit enable
Technical Description
The RF 133 RF/IF transceiver unit is comprised of a receive
path, a transmit path, and a synthesizer section as shown in
Figure 2. The receive path consists of a selectable gain IF
chain, a quadrature demodulator, and baseband amplifier
circuitry with I and Q outputs. The transmit path is essentially an
I/Q modulator with a translation loop for frequency up-
conversion. An on-chip oscillator and frequency dividers make
up the synthesizer section. Each section of the RF 133 is
separately enabled via the enable signals: TXENA, RXENA, and
SXENA.
To control different modes of operation, a serial 21-bit word (bits
S1 to S21) is written to the on-chip registers. This 21-bit word is
programmed using the three-wire input signals, CLK, DATA, and
LE. To ensure that the data remains latched, either one of the
signals TXENA, RXENA, or SXENA must stay enabled. The
operating mode that draws the least current (12 mA) is the
synthesizer mode (i.e., the mode that results when only SXENA
is enabled) (refer to Table 5). In the sleep mode, the device
typically draws less than 1 µA of current.
The block diagram in Figure 3 shows a complete RF/IF dual-
band transceiver chipset using the RF133.
Receive Path _______________________________________
Selectable Gain IF Chain and Quadrature Mixer. The receive
path of the RF133 is composed of an IF section and a baseband
section. The IF section consists of three programmable gain
amplifiers: PGA, PGB, and PGC.
100776A
Conexant
Proprietary Information and Specifications are Subject to Change
3
October 8, 1999
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