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PDF RF137 Data sheet ( Hoja de datos )
| Número de pieza | RF137 | |
| Descripción | Transceiver For GSM Applications | |
| Fabricantes | Conexant | |
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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
• 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
• GSM900/DCS1800/PCS1900 digital cellular
telephony
Data Sheet
GND
TLCPO
VCCB
VCC
GND
T X IF IN +
T X IF IN -
GND
TXI+
TXI-
TXQ+
TXQ-
1
2
3
4
5
6
7
8
9
10
11
12
36 BPC
35 GND
34 VCC
33 RES1
32 RES2
31 VCC
30 GND
29 IF2IN+
28 IF2IN-
27 IF2O+
26 IF2O-
25 LD
100777C-1_100500
Figure 1. RF137 Pinout – 48-Pin TQFP
Conexant - Proprietary
Data Subject to Change
Doc. No. 100777C
October 11, 2000
1 page  
Transceiver
RF137
Parameter
Differential output voltage
Output noise power
LO feedthrough
Sideband suppression
Spurious (Note 1)
Transmit frequency (input from VCO)
LO input frequency
IF frequency:
with divide-by-2
with divide-by-1
Transmit input power
Transmit input impedance
Table 3. RF137 Electrical Specifications (2 of 4)
(TA = 25 °C, Vcc = 3.0 V, except where specified)
Symbol
Test Condition
I/Q Modulator (continued)
NO 10 MHz offset
@200 kHz offset
@300 kHz offset
Translational Loop
fTX
fLO
fIF
S4 = 1, CO = 1
S4 = 0, CO = 1
PIN with external 50Ω
termination
ZIN differential
LO input power
LO input impedance
PIN With external 50Ω
termination
ZIN differential
Tx output noise
Charge pump output current
source/sink
source/sink
high impedance output
Tx output spurs (Note 3):
2X spurs
3X spurs
4X spurs
5X spurs
Device turn-on and lock time (with respect to enable input)
Operating frequency (depends on external resonator)
Tuning voltage range:
varactor ground referenced
varactor supply referenced
NO
IOUT
@ 20 MHz offset
(Note 2)
S10 = 0, CO = 1
S10 = 1, CO = 1
FVCO
1 MHz loop bandwidth
VHF VCO
Phase noise (Note 4)
10 MHz offset, FVCO =
800 MHz, resonator Q =
20
www.DataSheet4U.com
Min Typical Max Units
–20 –15
dBV
–130 –126 dBc/Hz
–43 –40 dBc
45 dB
–60 –40 dBc
–60 –45 dBc
800 2000 MHz
800 2000 MHz
MHz
70 425
70 300
–13 –10 –7 dBm
300// 0.3
–13 –10
–7
Ω
pF
dBm
300// 0.3
–165 –162
Ω
pF
dBc/Hz
±1.0
±0.5
0.02
–65
–70
–70
<–70
30 100
mA
mA
mA
dBc
dBc
dBc
dBc
µs
300 850 MHz
0.5 V
VCC–
V
0.5
–145 dBc/Hz
100777C
Conexant - Proprietary
Data Subject to Change
5
October 11, 2000
5 Page 
Transceiver
RF137
www.DataSheet4U.com
100777C
Figure 5. RF137 Typical Application Schematic
Conexant - Proprietary
Data Subject to Change
11
October 11, 2000
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet RF137.PDF ] | |
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