RF133 Conexant Systems, Inc., RF133 Datasheet - Page 3

• Manufacturer Part Number: RF133
• Manufacturer: Conexant Systems, Inc.

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
100776A
Pin #
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
GND
TLCPO
VCC
VCC
GND
TXIFIN+
TXIFIN–
GND
TXI+
TXI–
TXQ+
TXQ–
TXMO+
TXMO–
RXI+
RXI–
RXQ+
RXQ–
T/H
CTH1
CTH2
GND
LO2O+
LO2O–
Name
Ground (Tx phase detector/charge pump)
Translation loop charge pump output
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 (2
2
2
nd
nd
local oscillator output
local oscillator output
nd
LO output buffers)
Proprietary Information and Specifications are Subject to Change
Description
Table 1. RF133 Signal Descriptions
Conexant
Pin #
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
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 A 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.
VCC
LPFADJ
VCC
RES1
RES2
VCC
GND
BPC
SXENA
RXIFF–
RXIFF+
DATA
CLK
LE
RXENA
RXIFIN–
RXIFIN+
GND
LO1IN–
LO1IN+
VCC
TXRFIN–
TXRFIN+
TXENA
Name
Supply (2
Adjustment pin for baseband low pass filter corner
frequency
Supply (2
Resonator pin
Resonator pin
Supply (2
Ground (2
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)
1
1
Supply (Tx mixer, Rx IF sections)
Transmit RF input
Transmit RF input
Transmit enable
st
st
local oscillator input
local oscillator input
nd
nd
nd
nd
LO output buffers)
LO)
LO)
LO)
Description
October 8, 1999
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