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參數(shù)資料
| 型號： | U2894B-AFSG3 |
| 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) |
| 文件頁數(shù)： | 1/16頁 |
| 文件大小： | 802K |
| 代理商： | U2894B-AFSG3 |
U2894B
Rev. A4, 30-Sep-98
1 (16)
Modulation PLL for GSM, DCS and PCS Systems
Description
The U2894B 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 U2894B is designed for cellular phones such as
GSM900,
DCS1800,
and
PCS1900,
applying
a
transmitter architecture at which the VCO operates at the
TX output frequency. No duplexer is needed since the out-
of-band noise is very low. The U2894B exhibits low
power consumption. Broadband operation gives you high
flexibility for multi-band frequency mappings. The IC is
available in a shrinked small-outline 28-pin package
(SSO28).
The U2893B offers the same functionality with other
divider ratios.
Electrostatic sensitive device.
Observe precautions for handling.
Features
D Supply voltage range 2.7 V to 5.5 V
D Current consumption 50 mA
D Power-down functions
D High-speed PFD and charge pump (CP)
D Small CP saturation voltages (0.5/0.6 V)
D Programmable dividers and CP polarity
D Low-current standby mode
Benefits
D Novel TX architecture saves filter costs
D Extended battery operating time without duplexer
D Less board space (few external components)
D VCO control without voltage doubler
D Small SSO28 package
D One device for all GSM bands
Block Diagram
divider
N1
R1
divider
Mode
control
16
17
13
14
15
MUX
90
°
Voltage
reference
I/Q modulator
5
6
I NI
MDLO Q NQ PUMIX PU MIXO MIXLO
25
20
19
12
27
28
3
2
1
Mixer
PFD
Charge
pump
10
11
24
18
4
22
23
8
9
7
21
26
RF
NRF
VSP
CPO
VS1
VS2
VS3
MDO
NMDO
ND
NND
RD
NRD
MC
GND
CPC
GNDP
12494
+
Figure 1. Block diagram
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|---|---|
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| U2896B | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:Modulation PLL for GSM, DCS and PCS Systems |
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