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Número de pieza | RF210B | |
Descripción | (RF210A / RF210B) Image-Reject Downconverters | |
Fabricantes | Conexant Systems | |
Logotipo | ||
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Do not use for new designs. Use the RF212 device instead
(Data Sheet No. 100780)
RF210A and RF210B
Dual-Band, Image-Reject Downconverters For GSM Applications
The RF210A and RF210B devices are available as a dual-band front end for Global
System for Mobile Communications (GSM) handset applications. Both of these
highly integrated, monolithic devices are optimized for dual-band use in
GSM900/DCS1800 or GSM 900/PCS1900 applications. The devices include two
Low Noise Amplifiers (LNAs), two image-reject mixers, and two Local Oscillator
(LO) buffer amplifiers.
The main advantage of the RF210A and RF210B is their ability to provide 30 dB of
image rejection for both the GSM900 and the DCS1800 (or PCS1900) bands
without requiring the use of a post-LNA image reject filter. A block diagram of the
RF210(A/B) is shown in Figure 1. The device package and pin configuration are
shown in Figure 2.
Features
• LNA/image-reject mixer for RF to IF conversion
• 10 dB (RF210A) or 20 dB (RF210B) switchable
gain for GSM
• 8 dB (RF210A) or 16 dB (RF210B) switchable gain
for DCS/PCS
• 30 dB of image rejection. No post-LNA filtering
required
• High isolation LO input buffer
• Differential IF output
• High dynamic range
• Three-cell battery operation (2.7 to 5 V)
• 20-pin Thin Shrink Small Outline Package
(TSSOP)
Applications
• Dual-band digital cellular mobile telephony
(GSM900/DCS 1800 or GSM900/PCS1900)
LNA900IN
0
90
90
GAINSEL
LNA1800IN
IRM
0
90
BANDSEL
BIAS
BYP900 BYP1800
Figure 1. RF210(A/B) Block Diagram
IFOUT
LOIN
C069
NC
LNA900GND
1
2
20 MIXVCC
19 MIXGND
BIASGND
LNA900IN
BIASVCC
LNAVCC
GAINSEL
LNA1800IN
3
4
5
6
7
8
18 BYP900
17 IFOUT+
16 IFOUT-
15 BYP1800
14 BANDSEL
13 LOIN
LNA1800GND
ENA
9
10
12 LOGND
11 ADJMIX
C067
Figure 2. RF210(A/B) Pin Configuration – 20-Pin TSSOP
Data Sheet
Conexant
Proprietary Information and Specifications are Subject to Change
Doc. No. 100775A
October 20, 1999
1 page Image-Reject Downconverter
RF210(A/B)
RFC
VCC
RFC
RFC
.01 µF
22 pF
.01 µF
22 pF
.01 µF
22 pF
ENABLE
10
ENA
Fujitsu
FAR-F5CE-947M50-D235
900 MHz GSM
FL200
2
In
5
Out
Ground
1346
6.8 nH
4 LNA900IN
1.5 pF 22 pF
Gain Select
2K
22 pF
7 GAINSEL
100 pF
5 6 20
RF210
82 nH
2.2 2.2
pF 82 nH pF 56 nH
68 nH
0
90
90
IFOUT+ 17
IFOUT- 16
68 nH
7 B4806
1 Coil 6
IN2 OUT2
68 nH
25
IN1 OUT1
Ground
348
Siemens
400 MHz SAW Filter
(B4806)
150 pF
100 nH
100 nH
IF XCVR
68 nH
150 pF
IRM
Fujitsu
FAR-F6CE-1G8425-L2YB
FL201
2
1800 MHz DCS
In
5
Out
Ground
1346
1.5 nH
8 LNA1800IN
1.5 pF 22 pF
Band Select
2K
14 BANDSEL
BIAS
22 pF
BYP900
BYP1800
18
2.2 nF
15
2.2 nF
0 LOIN 13
90
ADJMIX 11
NC 1
Ground
2 3 9 12 19
LO
Figure 3. Typical RF210(A/B) Application Circuit
C070
100775A
Conexant
Proprietary Information and Specifications are Subject to Change
5
October 20, 1999
5 Page |
Páginas | Total 8 Páginas | |
PDF Descargar | [ Datasheet RF210B.PDF ] |
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