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Электронный компонент: MGCT04

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Obsolescence Notice






This product is obsolete.
This information is available for your
convenience only.

For more information on
Zarlink's obsolete products and
replacement product lists, please visit
http://products.zarlink.com/obsolete_products/
1
MGCT04
Transmit Circuit for TDMA/AMPS and CDMA/AMPS
Preliminary Information
DS5424
ISSUE 1.1
March 2001
Ordering Information
MGCT04/KG/LH1S
MGCT04/KG/LH1T
mobile phones. It can be used for both TDMA/AMPS
or CDMA/AMPS systems. The MGCT04 is
compatible with baseband and mixed signal interface
circuits from Zarlink Semiconductor and other
manufacturers.
System costs have been kept to a minimum by
removing the requirement for an additional SAW filter
in the transmit IF path. The AGC has been split
between RF and IF sections to reduce noise and a
low pass filter has been included before the IF
variable gain amplifier to remove spurious products
produced in the modulator.
Figure 1 - MGCT04 Block Diagram
Features
Dual RF Ports for 900MHz and 1900MHz
AGC Amplifier with 90dB of Variable Gain, Fully
Compensated for Temperature
On-chip Active Filter. Removes the
Requirement for External IF SAW Filter
High Power 900MHz and 1900MHz Output
Stages
Quadrature Modulator
Small Scale MLF Package
Applications
Transmit Modulator and Up-converter in TDMA/
AMPS Mobile Phones
Transmit Up-converter in CDMA/AMPS Mobile
Phones
The MGCT04 circuit is designed for use in dual
band, dual mode cellular 900MHz/PCS1900MHz
RF900
2/4 AND
PHASE
SHIFT
IF VGA
ALL PASS
PHASE
SHIFT
NETWORK
RF VGA
RF190
RF900
RFDEG1
VCO
BUFFER
OSC
BUFFER
8
VGA CONTROL
VHF OSC IN
Q IN
Q IN
I IN
I IN
13
14
15
16
7
10
9
22
AGC
UHF
OSCILLATOR
INPUT SELECT
CONTROL LOGIC
POWER CONTROL
8
CP2
CP1
CP0
23
5
19
21
LO 2GHz
LO 1GHz
1900 MHz
OUTPUT DRIVER
900 MHz
OUTPUT DRIVER
27
26
28
1
3
2
V
REF
BIAS
BUFFER
VHF OSC BIAS
SSB MIXER
DIV
OUT
RF190
RFDEG2
MGCT04
Preliminary Information
2
Pin
Signal Name
Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
RF DEG2
RF 900B
RF 900
RF GND
CP0
VCO GND
DIV OUT
CP2
VHF OSC IN
VHF OSC BIAS
VCO V
CC
GND
Q IN
Q INB
I IN
I INB
V
CC
UHF V
CC
LO 2GHZ
GND UHF
LO 1GHZ
AGC
CP1
RF V
CC
RF GND
RF 1900B
RF 1900
RF DEG1
Connection to external inductor to control gain of power amplifiers
Inverse output from 900MHz differential output driver
Output from 900MHz differential output driver
Ground to RF circuits
Control pin 0. See tables 2 & 3 for function
Ground for VHF oscillator
Output from VHF oscillator divided by 8
Control pin 2. See tables 2 & 3 for function
Input from external VHF oscillator
Switched bias voltage for external VHF oscillator
Positive supply to VHF oscillator
Ground
Q +input
Q -input
I +input
I -input
Positive supply
Positive supply to UHF LO input buffers
2GHz local oscillator input
Ground to UHF oscillator input buffers
1GHz local oscillator input
Control voltage for IF and RF variable gain amplifiers
Control pin 1. See tables 2 & 3 for function
Positive supply to RF circuits
Ground to RF circuits
Inverse output from 1900MHz differential output driver
Output from 1900MHz differential output driver
Connection to external inductor to control gain of power amplifiers
Table 1 - Pin Assignments
22
28
21
1
7
8
14
15
Figure 2 - Pin Connections - top view
Note:
Corner Pads are connected
to ground
Preliminary Information
MGCT04
3
Absolute Maximum Ratings
Supply voltage (V
CC
)
4V
Control input voltage
-0.6V to V
CC
+ 0.6V
Storage temperature, T
STG
-55C to +125C
Operating temperature
-40C to 100C
Max Junction Temperature (T
J
) 150C
Electrical Characteristics
Test conditions (unless otherwise stated): Tamb = -30C to +70C, V
CC
= 27V to 36V. UHF LO level = -15dBm
(both bands), I, Q input = 1.4 volts p.p, test frequency = 849MHz (900 output) and 1910MHz (1900
output).These characteristics are guaranteed by either production test or design. They apply within the
specified ambient temperature and supply voltage ranges unless otherwise stated.
Characteristics
Value
Units
Conditions
Min.
Typ.
Max.
Supply current
Sleep current
Standby mode
Standby Mode - Prescaler
disabled
Total supply current
Standby to operating mode
switching time
Logic inputs
Logic high voltage
Logic low voltage
V
CC
-0.6
0
8
4
118
75
10
160
10
V
CC
08
A
mA
mA
mA
s
V
V
All circuits off
See Tables 4 and 5
Pin 7 connected to V
CC
Maximum power PCS mode
Table 2 - DC Characteristics
Characteristics
Value
Units
Conditions
Min.
Typ.
Max.
I and Q modulator
I and Q input voltage level
1.0
1.4
2.0
Vpp
Differential
I and Q common mode voltage
1.2
V
I and Q differential input
resistance
13.5
k
I and Q input bandwidth
2.5
MHz
IF Vector offset
25
dB
Pout = +8dBm
SSB rejection
30
dB
Pout = + 8dBm
VHF oscillator input and divider
Input drive level
22
40
70
mVrms
From external VHF osc. via
matching network
VHF oscillator bias voltage
1.2
V
Output level from prescaler
400
mVpp
6pF load
Prescaler divide ratio
8
Drive output for synthesiser
Table 3 - AC Characteristics
MGCT04
Preliminary Information
4
Characteristics
Value
Units
Conditions
Min.
Typ.
Max.
Variable gain amplifiers
IF amp. operating frequency range
50
200
MHz
RF amp. operating frequency
range
750
2000
MHz
Overall gain control range
84
90
dB
Voltage gain
Control voltage for minimum gain
0.1
V
Control voltage for maximum gain
2.6
V
AGC control voltage slope
33
60
dB/V
SSB mixer and UHF oscillator
inputs
Cellular band LO input level
-15
-10
-5
dBm
From external UHF osc. via
matching network
PCS band LO input level
-15
-10
-5
dBm
From external UHF osc. via
matching network
Cellular band local oscillator input
frequency. (LO 1GHz)
850
1100
MHz
PCS band local oscillator input
frequency (LO 2GHz)
1500
2150
MHz
900MHz RF output stage
Specifications assume 50 ohm
load driven via a matching network
(Fig. 6)
RF amplifier operating frequency
range
824
849
MHz
Output power
+8
+19
dBm
Note 1
ACPR (CDMA)
-66
-52
dBc
Pout = +3dBm Vcc = 3V
ACPR (TDMA)
-45
-30
dBc
Pout = +8dBm, Offset = 30kHz
Vcc = 3V
-90
-60
dBc
Pout = +8dBm, Offset = 60kHz
Vcc = 3V
Output power AMPS
+10
+14
+19
dBm
Note 2
Receive band noise
-128
dBm/
Hz
At duplex frequency, offset 45MHz
Pout = +3dBm
Receive band noise
(869 - 894MHz)
-123
121
dBm/
Hz
ftx = 849 MHz Pout = +8dBm
Spurious Outputs
LO Leakage
-30
-20
dBc
Pout = +8dBm
Image Rejection
-30
-20
dBc
Pout = +8dBm
Other Spurii
-20
dBm
Note 3
Table 3 - AC Characteristics (continued)