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PDF ( 数据手册 , 数据表 ) ZL20250

零件编号 ZL20250
描述 2.5G Multimode Transceiver
制造商 Zarlink Semiconductor
LOGO Zarlink Semiconductor LOGO 


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ZL20250 数据手册, 描述, 功能
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Features
• Quad Band GSM (800/900/1800/1900 MHz)
Compatible
• Dual Band IS136 (800/1900 MHz) Compatible
• GPRS Class 12 and EDGE Capable
• Fully Integrated Dual Band Transceiver
• Receive - IF to Baseband I and Q
• Transmit - Baseband I / Q to RF
• Integrated Filters
• FM Demodulator
• RF and IF Synthesizers
• Fully Programmable via serial bus
• 3 Volt operation
• Small scale package
Applications
• GAIT IS136/GSM/EDGE Mobile Telephones
• Dual Band (850/PCS1900) TDMA/AMPS Mobile
Telephones
• Cellular 850MHz TDMA/AMPS Mobile
Telephones
• PCS1900 TDMA Mobile Telephones
• 2.5G World Phones - Quad Band
(850/900/1800/1900)
• Cellular Telematic Systems
ZL20250
2.5G Multimode Transceiver
Data Sheet
September 2003
Ordering Information
ZL20250/LCE (Tubes) 56 pin QFN
ZL20250/LCF (Tape and Reel) 56 pin QFN
-40°C to +85°C
Description
The ZL20250 is a fully integrated transceiver for
multimode IS136/GSM/GPRS/EDGE handsets. The
dual IF inputs to the receive path are amplified and
down-converted to baseband I and Q signals. Gain
control and baseband filtering are provided. A FM
demodulator is also provided where AMPS
compatibility is required.
The transmit path consists of a quadrature modulator,
gain control at IF and up-conversion to RF. Dual band
RF outputs are provided.
ZL20250 also includes a fractional N RF synthesizer
and two IF synthesizers to provide all local oscillator
signals required.
Flexible programming is provided via a 3 wire serial
bus. Additional control pins allow accurate timing
control when switching between modes.
GSM/EDGE
IS136
UHF LO O/P
UHF VCO
900 MHz Tx
1900 MHz Tx
90°
Rx VHF
PLL
UHF
PLL
FM
Demod
Tx VHF
PLL
Serial
Interface
Control
Rx I
Rx Q
FM
RSSI
LOCK DET
Tx I
IQ
Mod
Tx Q
Tx IF Filter
(Opt)
Figure 1 - Block Diagram
1
Zarlink Semiconductor Inc.
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright 2003, Zarlink Semiconductor Inc. All Rights Reserved.







ZL20250 pdf, 数据表
ZL20250
Data Sheet
1.0 General Description
A detailed block diagram is shown in Figure 3. This shows the receive and transmit paths plus the LO generation
circuitry. Control is via a serial bus with the addition of direct inputs to control receive and transmit modes and
optimize power consumption.
IF0 IN+ 53
IF0 IN– 52
RX GAIN 51
IF1 IN+ 55
IF1 IN– 54
dc
Offset
MUX
AMPS demod.
and RSSI
π /2 60kHz
MUX
43 RX I+
44 RX I–
45 FM OUT
46 FM FB
40 RSSI
41 RX Q+
42 RX Q–
1900
LO OUT 9
900 8
LO OUT
TX 1900 19
TX 900 16
π /2
50
÷N
47 48 39
Tank
Circuit
Loop
Filter
PLL
I SET 37
VCC RX PLL 49
13 7
900 LO IN
12
LO Select
and
Doubler
Option
14
1900 LO IN
TCXO 4
Loop
Filter
VCC TX PLL 31
VCC VHF CP 38
Loop
Filter
6 5 30
Tank
Circuit
29
35
PLL
π /2
π /2 MUX
π /2
Σ
PLL
Control
Control
Serial
interface
36 LOCK DET
10 RESETB
11 ENABLE1
20 ENABLE2
34 TX RXB
56 VCC CONTROL
1 SDAT
2 SCLK
3 SLATCH
32 TX I+
33 TX I–
27 TX Q+
28 TX Q–
18 17
15
23 22
Option
25 26
21 24
Figure 3 - ZL20250 Detailed Block Diagram
8
Zarlink Semiconductor Inc.







ZL20250 equivalent, schematic
ZL20250
Data Sheet
1.2 Transmit
Transmit operation is similar for all modes and a detailed diagram is shown in Figure 7. This diagram also shows the
UHF LO generation circuit blocks. A summary of the characteristics of the transmit path circuit blocks are given in
the table below. All circuit blocks are differential with the exception of the transmit RF outputs.
Circuit
Block
Gain Bandwidth
(dB) (If Applicable)
Description
Reconstruction Filters 0 -12
Quadrature Modulator
Transmit IF
Up-converter
Transmit RF
IS136/AMPS
12.5 kHz
GSM
100 kHz
Baseband input stage. Gain is programmable in 3 dB steps from 0 to 12
dB.
Filter bandwidth is selected for IS136/AMPS or GSM.
There is also a by-pass mode so that the baseband I and Q signal can go
direct to the modulator
Generates a modulated IF signal
400 MHz
Provides gain control at IF frequency. This stage also includes a low
pass filter to remove harmonics and spurii from modulator output.
This stage also includes a buffered IF output which can be used with an
external IF filter.
SSB up-converter to RF frequency. The IF path includes phase shift
networks for the up-converter. This stage also includes the input circuit
from the optional external IF filter
The 900 MHz and 1900 MHz RF stages each consist of 2 stages. The
first stage gain be set from -6 to +3 dB in 3 dB steps. Output stage
current is controlled by agc signal to reduce current consumption at low
output power levels. Each output stage requires an external
degeneration inductor
Table 4 - Transmit Circuit blocks
Differential baseband transmit I and Q signals from a baseband processor are input to the ZL20250. The baseband
signals are passed through filters - the filter bandwidth is selected for the appropriate mode i.e. IS136 or GSM. A
quadrature modulator modulates these baseband signals on to the transmit IF which is typically around 200 MHz.
This modulated IF signal is passed through an on chip low pass filter which removes harmonics of the IF and then
into a gain controlled amplifier. This amplifier is controlled by an external analogue signal and provides greater than
60dB gain control The output of the gain controlled amplifier can then be up-converted to RF or alternatively the
output can be sent to an off chip filter to provide further filtering and removal of noise before up-conversion. This filter
is a parallel tuned circuit as shown in Figure 8. The choice of component values is dependent on the IF frequency
being used. The filter output is then fed back on chip to the up-converter. A SSB mixer is used for the up-conversion
to remove the unwanted image. High side or low side LO injection can be selected
A buffer amplifier after the up-conversion provides a further 9 dB gain control in 3 dB increments. This gain is
programmable via the serial bus and can be used to optimize noise and linearity performance in particular
applications. Finally there are two RF output stages for 900 MHz and 1900 MHz frequency bands. Each RF output
is single ended and requires a simple matching network. The supply current of the output stages is automatically
reduced at low transmit gain control voltages improving the efficiency of the output buffer at low output power levels.
The supply current of the output buffer can also be controlled via the serial bus. This allows the supply current to be
reduced which is particularly useful when using AMPS or GSM where the linearity performance is less critical.
The FM modulation for AMPS can be done using I,Q modulation if available. Alternatively FM modulation can be
applied direct to the transmit IF VCO. The loop bandwidth for the transmit VHF PLL should be low ( ~100 Hz) to
ensure the PLL does not remove the modulation. A dc voltage should be applied across the Tx I+, Tx I- and the Tx
Q+, Tx Q- inputs to switch the modulator and generate an IF carrier signal. With a baseband gain of 0dB a dc voltage
of at least 1.5 volts should be applied; a lower voltage can be used with the baseband gain increased to compensate.
It is assumed that this bias can be provided by the baseband however if this is not possible then the simplest solution
is to connect 200kohm resistors between I+, Q+ inputs and Vcc and 200kohm resistors between I+,Q- inputs and
16
Zarlink Semiconductor Inc.










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