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U2896B-MFCG3 Datasheet

  • U2896B-MFCG3

  • Modulation PLL for GSM, DCS and PCS Systems

  • 13頁

  • TEMIC

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U2896B
Modulation PLL for GSM, DCS and PCS Systems
Description
The U2896B is a monolithic integrated circuit. It is
realized using TEMIC鈥檚 advanced silicon bipolar UHF5S
technology. The device integrates a mixer, an I/Q
modulator, a phase-frequency detector (PFD) with two
synchronous programmable dividers, and a charge pump.
The U2896B 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 U2896B exhibits low
power consumption. Broadband operation gives high
flexibility for multi-band frequency mappings. The IC is
available in a shrinked small-outline 36-pin package
(SSO36).
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
D
D
D
D
D
Novel TX architecture saves filter costs
Extended battery operating time without duplexer
Less board space (few external components)
VCO control without voltage doubler
Small SSO36 package
One device for all GSM bands
Block Diagram
VS1 GND1 I NI
6
MDLO 3
NMDLO 4
MDO
NMDO
7
8
Modulator
5 1
2
Q NQ
36
LO
V
Ref
90擄
Mixer
24
31
29
28
30
35
23
PU
NMIXOMIXO PUMIX MIXLO
32
33 34
25
NMIXLO
VS3
RF
NRF
GND3
22
ND
NND
15
RD
NRD
16
R
1:2
Mode control
17
MC
27
26
13
CPCL
14
CPCH
14891
21
N
1:2
MUX
PFD
Charge
pump
10
11
12
VSP
CPO
GNDP
VS2 GND2
Figure 1. Block diagram
Rev. A1, 18-Sep-98
1 (13)
Preliminary Information

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