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參數資料
| 型號： | RF212-21 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Image-Reject Front End for Dual or Tri-Band GSM Applications |
| 中文描述： | 鏡像抑制前端雙或三頻GSM應用 |
| 文件頁數： | 1/9頁 |
| 文件大小： | 89K |
| 代理商： | RF212-21 |
Data Sheet
Conexant
Doc. No. 100780D
May 24, 2000
Proprietary Information and Specifications are Subject to Change
RF212
Image-Reject Front End for Dual or Tri-Band GSM Applications
The RF212 device is available as a dual-band (EGSM900/DCS1800) front end or
as a tri-band (EGSM900/DCS1800/PCS1900) front end for Global Systemfor
Mobile Communications (GSM) mobile telephony applications. Each device
integrates all the required front-end components after the frequency pre-select
filters. These components include the Low Noise Amplifiers (LNAs), the internal
image-reject filters, mxers, and a Local Oscillator (LO) amplifier.
The main advantage of the RF212 is its ability to provide a mnimumof 35 dB of
image rejection for each band. The block diagrams of the devices are shown in
Figures 1 and 2. The device packages and pin configurations are shown in Figures
3 and 4.
Features
Supports EGSM
LNA and mxer for RF to IF conversion
12 dB or 20 dB switchable gain step
Mnimum35 dB of image rejection
No external post-LNA filters required
Common Intermediate Frequency (IF) port for all
bands
IF range from350 MHz to 450 MHz
High isolation LO input buffer
Differential IF output
High dynamc range with low current consumption
Three-cell battery operation (2.7 to 3.6 V)
20-pin Exposed paddle, Thin Shrink Small Outline
Package (ETSSOP)
Applications
Dual/tri-band digital cellular mobile telephony
(EGSM900/DCS1800, or
EGSM900/DCS1800/PCS1900)
LNA1800IN
LNA900IN
IFout
Gain
Sel
control
Band Select 1
Step
Sel
C0002
LOIN
Figure 1. RF212 Dual-Band Device Block Diagram
LNA1800IN
LNA900IN
IFout
LNA1900IN
Gain
Sel
control
Band Select 1
Step
Sel
Band Select 2
C0001
LOIN
Figure 2. RF212 Tri-Band Device Block Diagram
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