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參數(shù)資料
| 型號(hào)： | U2893B |
| 英文描述： | Modulation PLL for GSM, DCS and PCS Systems |
| 中文描述： | 調(diào)制鎖相環(huán)用于GSM，DCS和PCS系統(tǒng) |
| 文件頁(yè)數(shù)： | 1/14頁(yè) |
| 文件大?。?/td> | 294K |
| 代理商： | U2893B |
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U2893B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 29-Jan-97
1 (14)
Modulation PLL for GSM, DCS and PCS Systems
Description
The U2893B is a monolithic integrated circuit. It is
realized using TEMIC’s advanced silicon bipolar UHF5S
technology. The device integrates a mixer, an I/Q modu-
lator, a phase-frequency detector (PFD) with two
synchronous-programmable dividers, and a charge pump.
The U2893B is designed for cellular phones such as GSM,
DCS1800, and PCS1900, applying a transmitter-archi-
tecture where the VCO is operated at the TX output
frequency.
U2893B exhibits low power consumption, and the power-
down function extends battery life.
The IC is available in a shrinked small-outline 28–pin
package (SSO28).
Features
Supply voltage down to 2.7 V
Current consumption 40 mA
Power-down function
Low-current standby mode
High-speed PFD and charge pump
Integrated dividers
Benefits
High-level RF integration
TX architecture saves filter costs
Low external part count
Small SSO28 package
One device for various applications
Block Diagram
Voltage
reference
PFD
+
I/Q modulator
R : 1
divider
90
grd
MIXLO
VSP
CPO
GNDP
CPC
MDO
NMDO
RD
I
NI
MDLO
NQ
PU
MIXO
Q
PUMIX
N : 1
divider
ND
NND
VS3
GND
Mixer
MUX
MC
Mode
control
RF
VS1
VS2
NRD
NRF
12494
Figure 1. Block diagram
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