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參數(shù)資料
| 型號： | U2895B |
| 廠商： | Electronic Theatre Controls, Inc. |
| 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： | 803K |
| 代理商： | U2895B |
U2895B
Rev. A3, 30-Sep-98
1 (16)
Modulation PLL for GSM, DCS and PCS Systems
Description
The U2895B 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 U2895B is designed for cellular phones such as
GSM900, DCS1800, and PCS1900, applying a trans-
mitter 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 U2895B exhibits low power
consumption. Broadband operation gives high flexibility
for multi-band frequency mappings. The IC is available
in a shrinked small-outline 28-pin package (SSO28).
Electrostatic sensitive device.
Observe precautions for handling.
Features
Supply voltage range 2.7 V to 5.5 V
Current consumption 50 mA
Power-down functions
High-speed PFD and charge pump (CP)
Small CP saturation voltages (0.5/0.6 V)
Programmable dividers and CP polarity
Low-current standby mode
Benefits
Novel TX architecture saves filter costs
Extended battery operating time without duplexer
Less board space (few external components)
VCO control without voltage doubler
Small SSO28 package
One device for all GSM bands
Block Diagram
divider
N
1
R
divider
1
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
15048
+
2
Figure 1. Block diagram
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