MGCR01
Dual Mode IF Receiver for TDMA/AMPS and CDMA/AMPS
Datasheet
Features
•
•
•
•
•
•
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Dual IF Inputs 50 to 250 MHz
90dB AGC Gain Control
IQ demodulator
On chip oscillator provides high accuracy
quadrature LO generation
Optional IF Output
3 Volt Power Supply
28 lead QSOP Package
DS4721
ISSUE 4.4
November 2001
Ordering Information
MGCR01/KG/QP1S
MGCR01/KG/QP1T
Description
The MGCR01 is designed for use in dual mode
mobile phones (TDMA/AMPS and CDMA/AMPS).
The circuit provides IF amplification with gain control
and differential I and Q baseband outputs. The
MGCR01 interfaces directly with MGCM01 for
TDMA/AMPS (using 60kHz low IF) and MGCM03 or
MGCM04 for CDMA and AMPS applications. The on
chip oscillator and prescaler are also compatible with
the PLL synthesisers on these devices.
IF OUT
IF VCC
IF VEE
FM IFIN
I OUT
CDMA IFIN
Q OU T
AGC
Gain
Control
Temperature
Comp.
DLL
BAND 1900
Overload
Indicator
STARTUP
ENABLE
MODE CDM
PRESCALER
DIV2 EN
Mode
Control
VHF VCC
VHF VEE
Figure 1 - Block Diagram
OVERLOAD DET
VHF RES
VHF BUF
1
MGCR01
IF VCC
IF OUTB
IF OUT
IF VEE
GND
CDMA IFIN
CDMA IFINB
FM IFIN
FM IFINB
AGC
AGCB
MODE CDMA
ENABLE
GND
VHF VCC
I OUTB
I OUT
VHF VEE
OVERLOAD DET
VHF RES
VHF RESB
BAND 1900
VHF BUF
VHF BUFB
DIV2 EN
Q OUT
Q OUTB
STARTUP
QSOP28
Figure 2 - Pin Connections
Pin No.
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
Pin Name
IF VCC
IF OUTB
IF OUT
IF VEE
GND
CDMA IFIN
CDMA IFINB
FM IFIIN
FM IFINB
AGC
AGCB
MODE CDMA
ENABLE
GND
STARTUP
QOUTB
QOUT
GND
VHF BUFB
VHF BUF
BAND 1900
VHF RESB
VHF RES
OVERLOAD DET
VHF VEE
I OUT
I OUTB
VHF VCC
IF ouput
IF output
Description
Supply for IF inputs and AGC blocks
Ground for IF inputs and AGC blocks
Substrate ground
IF input (CDMA)
IF input (CDMA)
IF input (FM)
IF inputs (FM) (AC ground)
AGC Control for IF section
AGC control for IF sections (AC ground)
CDMA/FM input select
Power up AGC sections of device
Substrate Ground
Power up Oscillator, DLL and Mixer
Q channel baseband output
Q channel baseband output
Ground
VHF oscillator buffered output for synthesiser
VHF oscillator buffered output for synthesiser
VHF oscillator mode (see table 1)
VHF VCO resonator
VHF VCO resonator
Overload detector output
Ground for VHF VCO and DLL blocks
I channel baseband output
I channel baseband output
Supply for VHF and DLL blocks
Table 1 - Pin Description
2
MGCR01
X = Don’t Care
Description
Standby Mode
Start up Mode
ENABLE
0
0
0
STARTUP
0
1
1
MODE CDMA
X
X
X
BAND 1900
X
1
0
Conditions
All circuits powered down
except logic inputs
For high band IF
For low band IF
Turns on VCO circuits, DLL
quadrature generation,
prescaler and IQ
demodulator. All other
circuits remain powered
down
CDMA mode
1
1
1
1
1
1
1
0
For high band IF
For low band IF
All circuits operational
except for IF output buffer,
CDMA input stage selected.
FM Mode
1
1
0
0
All circuits operational
except for IF output buffer,
FM input stage selected.
Note 4
Demodulator and LO
generation circuitry powered
down. IF output buffer
enabled
Demodulator and LO
generation circuitry powered
down. IF output buffer
enabled.
Alternative FM
mode
CDMA IF AGC
only mode
1
1
1
0
0
1
1
X
FM IF AGC
1
0
0
X
Table 2 - Electrical Characteristics (Mode Control)
Notes:
1. STARTUP mode is provided to allow VCO/DLL/prescalers to stabilise before signal path is activated.
This is a power-saving feature since the signal path is redundant during this period. If this feature is not
required, the ENABLE and STARTUP control pins can be shorted together so that all circuitry is activated
at the same time.
2. In high band mode (Band 1900 = 1) the VCO operates at twice the IF frequency. For example if IF =
210.38MHz then the oscillator operates at 420.76MHz. A delay locked loop (DLL) circuit then generates the
quadrature LO signals.
3. In low band mode (Band 1900 = 0) the VCO operates at 4 times the IF frequency. for example if IF =
85.38MHz the oscillator operates at 341.52MHz. This is then divided and uses DLL circuit to provide the
quadrature LO signals.
4. This mode can be used for FM. The VCO operates at twice the LO frequency. This mode is not normally
used as a large tuning range is required on the VCO.
3
MGCR01
DLL and Prescaler divide ratios
The BAND 1900 and DIV2 EN inputs allow the overall divide ratio to control the total divide ratio in MGCR01 as
shown in the following table.
BAND 1900
1
0
1
0
DIV2 EN
1
1
0
0
DLL Divide Ratio
2
4
2
4
Prescaler Divide
Ratio
2
2
4
2
Total Divide Ratio
4
8
8
8
Table 3 - Prescaler Ratios
Notes:
if DIV2 EN is set low then the total divider ratio is always 8.
If DIV2 EN is set high then the prescaler divide ratio is always 2. For example with BAND 1900 high and if the
oscillator frequency is 300MHz, then the DLL output (the mixer LO frequency) will be 150MHz and the
prescaler output will be 75MHz.
Description
Supply Voltage
Operation temperature, Tamb
Storage temperature, Tstg
Junction temperature, Tj
Power dissipation
Maximum Pin Voltage
Minimum Pin Voltage
ESD voltage
Min
Typ
Max
4.0
Units
Volts
°C
°C
°C
mW
Volts
Volts
kV
Comments
-30
-40
+100
+125
+150
350
Vcc+0.6
Ambient temperature
All pins except V
CC
and GND
All pins except V
CC
and GND
Human Body Metal
-0.6
1.75
Table 4 - Absolute Maximum Ratings
Electrostatic handling precautions must be applied.
4
MGCR01
T
amb
= 30°C to +70°C, V
CC
= +2.7 to +3.6. These characteristics are guaranteed by either production test or
design. They apply within the specified ambient temperature and supply voltage unless otherwise stated.
Value
Characteristic
Min
General
Supply Voltage
Operating Temperature
Current Consumption
Standby Mode
Startup Mode
CDMA Mode
FM Mode
CDMA AGC only Mode
FM AGC only Mode
Mode Control Logic
CMOS input logic high, VIH
CMOS input high current, IIH
CMOS input low current, IIL
Switching time between any two modes
AGC Control
AGC Input impedance
DC Common Mode voltages
I OUT, I OUTB (CDMA Mode)
I OUTB, QOUTB
I OUT<Q OUT (FM Mode)
I OUTB, Q OUTB
V
CC
-0.5
-10
-10
3
0.1
100
V
CC
-0.8
V
CC
-0.8
130
V
CC
-0.6
V
CC
-0.6
2.6
160
V
CC
-0.4
V
CC
-0.4
2.7
-30
Typ
3.0
27
0.03
8
14
14
8
11
Max
3.6
85
0.1
13
23
23
13
18
V
CC
+0.1
10
10
V
°C
mA
mA
mA
mA
mA
mA
V
µ
A
µ
A
ms
V
k
Ω
V
V
All logic inputs
All logic inputs
All logic inputs
All V
CC
Pins
Ambient See note 1
Units
Conditions
Table 5 - Electrical Characteristics (DC specifications)
Notes:
1. Specifications are guaranteed over -30 to + 70°C, however operation is guaranteed over the extended
range of -30 to +85°C with minimal variation in specified parameters.
5
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