1
MGCM02
TDMA/AMPS IF and Baseband Interface
Data Sheet
April 2003
Ordering Information
MGCM02/
KG/BP1N
Figure 1 - Block Diagram
Features
Complete IF to Baseband for IS136
100dB Gain Control
Channel Filtering (30kHz)
FM Demodulator
RSSI Output
Dual IF Synthesisers
Fully Programmable via serial bus
3 Volt operation
49 Ball BGA package (7 x 7 mm)
Applications
Dual Mode TDMA/AMPS Mobile telephones
Dual Band (PCS1900/900) TDMA/AMPS Mobile
telephones
PCS 1900 TDMA Mobile Telephones
Description
The MGCM02 provides the complete IF to baseband
I and Q including channel filtering for IS136/AMPS.
The receive input is at an IF frequency up to
200MHz. This is downconverted to an internal IF of
60kHz and filtered by a switched capacitor bandpass
filter which also provides image rejection. The 60kHz
signal is then demodulated to give baseband I and Q
signals. Over 100dB of gain control is provided. The
baseband outputs can be input directly to an A to D
converter.
The internal FM discriminator can be used for
demodulating AMPS signals. The receive path also
provides RSSI.
Transmit I and Q baseband signals from D to A
converters can be input directly to MGCM02 which
provides reconstruction filters and a variable gain
buffer.
The two PLL synthesisers are used for generation of
the receive and transmit IF LO signals.
Receive Section
90
RXQ OP+,-
60kHz
60kHz
RXI OP+,-
IF IP+,-
AUDIO
AUDIO FB
RSSI FB
RSSI
LO +
LO -
FM
Discrim
Control
SCLK
SDATA
SLATCH
RESETB
PCA
Transmit Section
Tx FM
TX
IIP+,-
TXQ
IP+,-
TXI
OP+,-
TXQ
OP+,-
Rx
Tx
Rx
VCO
Rx LOCK
Rx PD
Tx LOCK
Tx PD
Synthesisers
Tx
VCO
RSSI
To Rx PLL
MGCM02/
KG/BP1Q
MGCM02
Data Sheet
2
Pad Assignment
No
Pin Name
Type
Description
A1
RTUNE
Bias Reference - connect 100k
to ground
A2
VBG
Bandgap Reference Decoupling
A3
PCA
Input
Power Control Assert
A4
SDATA
Input
Serial Interface, Serial Data In
A5
VDD
Power
Power Supply - Digital
A6
TCXO
Input
19.44MHz Reference from TCXO
A7
GND (TX)
Ground
Ground - Transmit Section
B1
RXI OP+
Output
Baseband Receive I Output +
B2
RXI OP-
Output
Baseband Receive I Output -
B3
SCLK
Input
Serial Interface, Clock
B4
GND
Input
Ground Digital
B5
RESETB
Input
Reset (active low)
B6
TXQ IP-
Input
Transmit Q Input -
B7
TXQ IP+
Input
Transmit Q Input +
C1
RXQ OP-
Output
Baseband Receive Q Output -
C2
GND
Ground
Ground - Receive Section
C3
AGC
Input
AGC control voltage
C4
SLATCH
Input
Serial Interface, Latch
C5
LOCK DET
Output
Synthesiser Lock Detect
C6
TXI IP-
Input
Transmit I Input -
C7
TXI IP+
Input
Transmit I Input +
D1
RX IP+
Input
Receive IF Input +
D2
RXQ OP+
Output
Baseband Receive Q Output +
D3
GND
Ground
Ground (Substrate Connection)
D4
NC
Not Connected
D5
GND
Ground
Ground (Substrate Connection)
D6
TXI OP+
Output
Transmit I Output +
D7
VDD
Power
Power Supply - Transmit Section
E1
RX IP-
Input
Receive IF Input -
Data Sheet
MGCM02
3
E2
VDD
Power
Power Supply - RSSI and Demodulator
E3
RSSI
Output
RSSI Output
E4
UHF LOCK
Input
UHF Synth Lock Input
E5
TX FM
Output
Transmit FM Output
E6
TXQ OP+
Output
Transmit Q Output +
E7
TXI OP-
Output
Transmit I Output -
F1
AUDIO FB
Input
Demodulator Feedback
F2
GND
Ground
Ground RSSI/Demodulator
F3
RSSI FB
Input
RSSI Feedback
F4
RX PD
Output
Receive PLL Charge Pump Output
F5
GND
Ground
Ground - Synthesiser
F6
VDD
Power
Power Supply - Synthesiser
F7
TXQ OP-
Output
Transmit Q Output -
G1
AUDIO
Output
Demodulator Audio/Data Output
G2
VDD
Power
Power Supply - Receive Section
G3
GND
Ground
Ground (Substrate Connection)
G4
VHF RESB
Input
VHF VCO resonator
G5
VHF RES
Input
VHF VCO resonator
G6
TX VCO
Input
Transmit IF PLL Input
G7
TX PD
Output
Transmit PLL Charge Pump Output
No
Pin Name
Type
Description
MGCM02
Data Sheet
4
Absolute Maximum Ratings
Supply Voltage
-0.3 to 3.9V
Voltage applied to any pin
-0.3 to Vcc + 0.3 V
Operating Temperature
-40 C to 100 C
Storage Temperature
-55 C to 150 C
Max Junction Temperature
150 C
ESD (Human Body Model)
2kV
Electrical Characteristics
Tamb = -40C to +85C, VDD = 3V +/- 10%. VEE = 0V. 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
Comments
Min
Typ
Max
Supply Current
Sleep
20
100
A
Powerdown
550
A
Powerdown - Rx PLL on
mA
Powerdown - Tx PLL on
mA
Receive Section (I/Q)
25
mA
Receive Section (FM)
26
mA
Receive Section (I/Q)
17
18.5
mA
T = 25C, Vdd = 3V
Receive Section (FM)
17
19.5
mA
T = 25C, Vdd = 3V
Transmit Section (I/Q)
6
9
mA
Transmit Section (FM)
3.5
6.5
mA
Logic Inputs
Input Voltage High - VIH
0.8Vdd
Volts
Input Voltage Low - VOL
0.2Vdd
Volts
Input Current
10
nA
Vin = 0 to Vdd
Input Capacitance
10
pF
Logic Outputs
Output Voltage Low
0.4Vdd
Volts
Output Voltage High
0.6Vdd
Volts
Output Current
+/-1
mA
Serial Control Timing
See Fig 7
SDATA Set Up t1
20
ns
SDATA Hold t2
20
ns
SCLK Pulse Width t3
50
ns
SLATCH Set up t4
20
t3 - 20
ns
SLATCH Pulse Width t5
50
ns
SCLK Period
100
ns
Data Sheet
MGCM02
5
Switch on/off times
Tx Turn on time
0.5
ms
Tx Turn off time
0.5
ms
Rx Turn on time
1.0
ms
Rx Turn off time
1.0
ms
TCXO Input
Input Resistance
10
k
Input Capacitance
10
pF
Input Sensitivity
0.5
2
V p-p
ac coupled
Frequency
19.44
MHz
Receive - General
Input Impedance
8
12
16
k
Differential
Input Frequency
40
200
MHz
Output Impedance
2
k
Differential
Output Voltage RXI,RXQ
1.25
Volts
Selected by programming
Output Voltage RXI,RXQ
Vdd/2
Volts
Receive (IQ Mode)
Min Gain
-17
dB
Max Gain
96.5
dB
Gain
tbd
80
tbd
dB
Vagc = tbd
Gain Resolution
0.5
dB
Gain Control Slope
tbd
68
tbd
dB/V
I/Q Gain Matching
-0.5
+0.5
dB
I/Q Phase Balance
+/- 1
deg
Group Delay Ripple
14
16
s p-p
0 to 12.5 kHz
Gain Ripple
1.5
2.2
dB p-p
0 to 12.5 kHz
Noise Figure
12.5
dB
Rs = 850 ohms
Input IP3 (Max Gain)
-35
dBm
Note 2
Input IP3 (Gain = 80dB)
-20
dBm
Note 3
Output 1dB Compression
3
V p-p
Differential
Receive (FM Mode)
Input Sensitivity
-108
dBm
Rs = 850
Note 4
Noise Figure
13
dB
Rs = 850
Input IP3 (High Gain)
-20
dBm
Note 5
Audio Output
500
mV
Defined by external
components
Characteristics
Value
Units
Comments
Min
Typ
Max
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