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MGCR01
Dual Mode IF Receiver for TDMA/AMPS and CDMA/AMPS
Datasheet
Features
* * * * * * * 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 VCC and GND All pins except VCC and GND Human Body Metal
-0.6 1.75
Table 4 - Absolute Maximum Ratings
Electrostatic handling precautions must be applied.
4
MGCR01
Tamb= 30C to +70C, VCC = +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 OUTTable 5 - Electrical Characteristics (DC specifications)
Notes: 1. Specifications are guaranteed over -30 to + 70C, however operation is guaranteed over the extended range of -30 to +85C with minimal variation in specified parameters.
5
MGCR01
Tamb= 30C to +70C, VCC = +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. Frequency = 210.38MHz
Value Characteristic Min CDMA Max Voltage Gain to demodulator output Min Voltage Gain to demodulator output Max Voltage Gain to IF buffer output Min Voltage Gain to IF buffer output AGC control Max AGC control Min Gain slope Gain slope linearity Gain temperature stability Channel gain variation @ 210.38MHz NFGainmax Input V1dBGainmin IIP3Gainmax Input impedance 104 -13 69 -48 500 6 -2 -0.1 40 90 2 0.1 2.6 0.1 38 46 48 -55 41 -51 -49 -47 dB dB dB dB V V dB/V dB/V dB dB Within channel bandwidth (1.25MHz) Rs (500) Minimum gain Power (500) Max gain Power (500) With addition of external resistor across IF inputs Over gain control range AGC = 2.6v AGC = 0.1V IF mode IF mode Gain = Max Gain = Min Typ Max Units Conditions
5.5 110 -7
6.5
dB dBV dBm dBV dBm
IF Frequency CDMA to Amps isolation
50 30
250
MHz dB
Table 5 - Electrical Characteristics (DC specifications) - Continued
6
MGCR01
Tamb= 30C to +70C, VCC = +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. Frequency = 85.38MHz
Value Characteristic Min FM AGC Max Voltage Gain to demodulator output Min Voltage Gain to demodulator output Max Voltage Gain to IF buffer output Min Voltage Gain to IF buffer output AGC control Max AGC control Min Gain slope Gain slope linearity Gain temperature stability NFGainmax Input V1dBGainmin 98 -17 IIP3Gainmax 65 -54 Input Impedance 850 105 -14 6 -2 40 80 2 6 2.6 0.1 49 50 54 -49 56 -48 -40 -42 dB dB dB dB V V dB/V dB/V dB dB dBV dBm dBV dBm Over gain control range For any gain setting 850source Minimum gain Power (850) Max Gain Power (850) With addition of external resistor across IF inputs To demodulator outputs To demodulator IF AGC only mode IF AGC only mode Gain = Gain max Gain = Gain min Typ Max Units Conditions
IF Frequency VHF Local Oscillator Quaderature generation VCO Frequency
50
250
MHz
100 100
500 400 -100 -98
MHz MHz dBc/Hz
Note 2 Note 3 @30kHz, Hiband mode Minimum tank Q=15 Note 1 @>3MHz, Note 1 pk-pk single ended Differential
VCO Phase noise
VCO Noise floor VCO buffer output VCO buffer output impedance 350
-130
dBc/Hz mV
100
Table 5 - Electrical Characteristics (DC specifications) - Continued
Notes: 1. Phase noise is specified at the LO Input to the mixers. 2. Total divide ratio to prescaler output is 8. 3. Total divide ratio to prescaler ouput is 4. The prescaler output is limited to 100MHz max.
7
MGCR01
Tamb= 30C to +70C, VCC = +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 Demodulator Ouput I/Q Gain matching I/Q Phase matching Output impedance Baseband Bandwidth 3 0.1 0.5 4 50 0.25 2 5 dB deg k MHz Differential Defined by on-chip first order low-pass filter Typ Max I OUT, I OUTB, Q OUT, Q OUTB Units Conditions
Output IP3 Baseband differential DC offset Overload Detect CDMA FM Mode
117
119 3.5
dBV mV Referred to baseband outputs
104 106
dBV dBV
Table 5 - Electrical Characteristics (DC specifications) - Continued
8
MGCR01
Additional Information Typical Performance Characteristics
60
40
20 Gain (dB) T = -30 deg C T = 25 deg C T= 70 deg C
0
-20
-40
-60 0.00
0.50
1.00
1.50
2.00
2.50
3.00
AGC Control Voltage (V)
Figure 3 - CDMA Gain v AGC Voltage
60
40
20 Gain (dB) T = -30 deg C T = 25 deg C T= 70 deg C
0
-20
-40
-60 0.00
0.50
1.00
1.50
2.00
2.50
3.00
AGC Control Voltage (V)
Figure 4 - FM Gain v AGC Voltage
9
MGCR01
60
40
20 Gain (dB) VCC = 2.7 VCC = 3 VCC = 3.6
0
-20
-40
-60 0.00
0.50
1.00
1.50
2.00
2.50
3.00
AGC Control Voltage (V)
Figure 5 - CDMA Gain v AGC Voltage
60
40
20 Gain (dB) VCC = 2.7 VCC = 3 VCC = 3.6
0
-20
-40
-60 0 0.5 1 1.5 2 2.5 3 AGC Control Voltage (V)
Figure 6 - FM Gain v AGC Voltage
10
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