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RF137 Datasheet

  • RF137

  • Transceiver For GSM Applications

  • 117.54KB

  • 15頁

  • ETC

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RF137
Transceiver For GSM Applications
The RF137 Transceiver is a highly integrated device optimized for use in single-
band or multi-band Global System for Mobile Communications (GSM) applications.
In the receive path, the device consists of selectable gain Intermediate Frequency
(IF) amplifiers and an image reject downconverter with differential IF outputs.
In the transmit path, the device consists of an In-Phase and Quadrature (I/Q)
modulator and a frequency translational loop designed to perform frequency up-
conversion with high output spectral purity. This loop has a phase/frequency
detector, a charge-pump, a mixer, and buffers for the required isolation between
RF output, Local Oscillator (LO), and IF inputs.
In addition, the RF137 features an on-chip, dual-loop UHF/VHF frequency
synthesizer circuit. It includes two sets of reference dividers, phase/frequency
detectors, charge pumps, prescalers, main dividers, and control circuits.
The device package and pinout of the RF137 are shown in Figure 1. A block
diagram is shown in Figure 2.
The signal pin assignments and functional pin descriptions are found in Table 1.
The absolute maximum ratings of the device are provided in Table 2, and the
operating conditions and electrical specifications are provided in Table 3.
Features
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Image-reject mixer for downconversion to 2nd IF
24 dB selectable attenuation on 1st IF amplifier
12 dB selectable attenuation on 2nd IF amplifier
Integrated transmit path with high phase accuracy
Reduced filtering requirements for the transmit path
Wide RF and IF range for multi-band operation
Integrated, fully programmable dual loop
synthesizer
Integrated local oscillator phase shifters
On-chip second local oscillator
Low supply voltage down to 2.7 V
Separate enable lines for transmit, receive, and
synthesizer modes for power management
48-pin Thin Quad Flat Pack (TQFP) (7mm x 7mm)
package
Applications
鈥?/div>
GSM900/DCS1800/PCS1900 digital cellular
telephony
TXRFIN+
TXRFIN-
RXMXO
38
RXENA
39
48
47
46
45
44
43
42
41
40
GND
T LC PO
VC C B
VC C
GND
T XIFIN +
T XIFIN -
GND
T XI+
T XI-
T XQ +
T XQ -
1
2
3
4
5
6
7
8
9
10
11
37
36
35
34
33
32
31
30
29
28
27
26
SXENA
TXENA
IF1IN+
LOIN+
IF1IN-
LOIN-
GND
VCC
BPC
GND
VC C
R ES1
R ES2
VC C
GND
IF 2IN +
IF 2IN -
IF 2O +
IF 2O -
LD
13
14
15
16
17
18
19
20
21
22
23
VCPO
TXM O-
DATA
LE
VCCB
TXM O+
UCPO
VCCB
10 077 7C -1_1 00 500
CLK
GND
Figure 1. RF137 Pinout 鈥?48-Pin TQFP
Data Sheet
Conexant - Proprietary
Data Subject to Change
FREF
GND
24
12
25
Doc. No. 100777C
October 11, 2000

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