U2896B Datasheet, PDF (1/13 Pages) TEMIC Semiconductors – Modulation PLL for GSM, DCS and PCS Systems

U2896B
Modulation PLL for GSM, DCS and PCS Systems
Description
The U2896B is a monolithic integrated circuit. It is
realized using TEMIC’s 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 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 SSO36 package
D One device for all GSM bands
Block Diagram
VS1 GND1 I NI
6 51 2
Q NQ
36 35
PU NMIXOMIXO PUMIX MIXLO
23
32 33 34 25
MDLO ³
NMDLO ⁴
MDO ⁷
NMDO ⁸
LO
90°
V_Ref
Modulator
Mixer
NMIXLO
24
VS3
31
29
28
RF
NRF
30 ^GND3
22
ND ₂₁
N
NND
1:2
15
RD ₁₆
R
NRD
1:2
Mode control
17
MC
MUX
PFD
Charge
pump
VSP
10
CPO
11
GNDP
12
27
26 13
VS2 GND2 ^CPCL
Figure 1. Block diagram
14
CPCH ¹⁴⁸⁹¹
Rev. A1, 18-Sep-98
1 (13)
Preliminary Information