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MC2800SYNEVK
Advance Information
FLEX
TM Paging RF/IF Frequency
transistors MMBR941LT1, a M-ary FSK FM IF receiver MC2800 as well as NPC's phase lock loop SM5166AV as the core. The whole module includes a LNA, a voltage-controlled oscillator, a frequency multiplier, a PLL, a mixer and a FSK IF receiver. ORDERING INFORMATION
Device MC2800SYNEVK Description FLEX Paging Receiver Brd Evaluation Kit
Synthesizer Receiver
This document contains the information of a frequency synthesized receiver prototype for FLEX roaming paging platform. This FLEX paging receiver board is a high performance RF/IF front-end for using in FLEX roaming pager. This board employs Motorola's high frequency Features:
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* * * * * * *
Input RF Frequency Range: 278 to 286 MHz Input frequency channel spacing: 25.0 kHz Excellent Sensitivity: -123.0 dBm IF Receiver Operating Voltage: 1.15 to 1.7 V PLL Operating Voltage: 3.0 to 3.3 V Total Current Consumption: 4.3 mA @ VCC = 1.15 V, 0.08 mA @ VDD = 3.0 V Switchable Bit-Rate Filter to Support All Kinds of FLEX Data Rate
FLEX is a trademark of Motorola, Inc.
Figure 1. System Block Diagram
450 kHz Ceramic Filter RF AGC RSSI
SAW Filter RF Input LNA
Mixer
Crystal Filter
IF FSK Receiver MC2800
LO1 X3 X'tal LO Reference VCO PLL
2 Bits Output To FLEX Decoder 3 Bits Control Lines 3 Bits Control Lines
This document contains information on a new product. Specifications and information herin are subject to change without notice.
(c) Motorola, Inc. 2000
Rev 1
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Figure 2. The Schematic of the Frequency Synthesized RF/IF Receiver Board
Vreg C8 100 nF C7 100 pF R9 820 C23 1.0 nF R3 2.4 k L2 33 nH Q2 Q1 L1 27 nH C11 10 nF C1 3.0 pF D1 Not Used C3 7.0 pF C9 2.0 pF C16 Not Used C6 100 nF L3 39 nH FILTER1 SAFC281ME75N C20 22 pF Q3 C21 0.5 pF C45 Not Used C24 100 nF
2
C4 1.0 nF R1 6.8 k RF In C2 4.0 pF C5 10 nF
R4 200
R8 8.2 k
L4 2.2 H
C22 10 pF FILTER2 MXF21.4-15A C27 4.0 pF L5 5.6H
C26 4.0 pF
C25 10 nF Q7 MMBT3906LT1
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C15 10 nF
C13 R7 10 100 nF
R2 2.2 k Q6 MMBT3904LT1 C61 100 nF R24 9.1 k R29 1.5 k R23 24 k VCC C38 100 nF 16 15 14 13 C39 10 F C49 100 pF
R6 510 L10 2.7 H Q4 C11 33 pF C54 22 pF
R19 1.6 k
L7 820 nH C52 33 pF
C19 1.0 nF
R18 36 k
L8 27 nH Q5
FILTER3 CFWC450F C63 1.0 pF L11 22 nH
C50 1.0 F
Figure 2.
C53 1.0 nF
L6 100 nH
C17 4.0 pF
L9 4.7 H
C55 15 pF
D2 MMBV609LT1
C51 1.0 pF C12 22 pF
C18 C62 12 pF 12 pF
R5 430
C44 4.7 F
C42 100 nF
X1 C41 18 pF
C47 22 pF 25 26 27 28 29 30 31 32
24 23 22 21 20 19 18 17
VDD C56 56 pF R28 910 R27 1.1 k L12 BLM11B750S C68 2.2 F 8 76 5 C67 1.0 F C66 1.0 nF L64 0.22F 4 3 2 1 C48 1.0F R12 10 M VCC R11 10 M C37 100 nF C70 1.0 nF L13 BLM11B750S R14 100 k R13 100 k C57 1.0 nF
C30 C31 0.1 F 4.7 F R10 7.5 k
MC2800
12 11 10 C29 4.7 F 9 C40 100 nF
C28 47 nF
1
2
3
4
5
6
7
8 C34 3.3 nF
C69 1.0 F
SM5166AV
9 10 11 12 13 14 15 16
C65 33 nF
C36 100 nF
C32 2.2 nF C35 100 nF C33 22 nF
R16 100 k
R15 100 k
R26 620
C58 1.0 nF C59 1.0 nF C60 1.0 nF R25 100 k R20 100 k R21 100 k R22 100 k 12
Gnd
R17 100 k
6
1
5
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RECOMMENDED OPERATING CONDITIONS
Characteristic Operating Voltage RF Input Frequency Range PLL & FLEX Decoder Interface Voltage VDD Symbol VCC Min 1.15 278 3.0 Typ - - - Max 1.7 286 3.3 Unit V MHz V
TEST CONDITIONS
Characteristic Operating Voltage PLL & FLEX Decoder Interface Voltage MC2800 Regulated Output Voltage RF Input Frequency Symbol VCC VDD Vreg fRF fsyn Min - - - - - Typ 1.15 3.3 0.980 282.0000 260.6000 Max - - - - - Unit V V V MHz MHz
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Synthesizer Frequency
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ELECTRICAL CHARACTERISTICS
Characteristic LOW NOISE AMPLIFIER Power Gain [Note 1] S11 [Note 1] @ 282 000 MHz 282.000 Zout [Note 1] Noise Figure [Note 1] Current Consumption SAW FILTER Insertion Loss Terminating Impedance = 230 - 1.0 - dB Vreg = 0.980 V GP S11 Zout NF I - - - - - 19.9 -10.1 227 + j46 3.3 850 - - - - - dB dB dB A Conditions Symbol Min Typ Max Unit
VOLTAGE CONTROLLED OSCILLATOR + FREQUENCY MULTIPLIER Desired Output Tone Frequency 3rd Harmonic Desired Output Tone Amplitude 2nd Harmonic Output Power 4th Harmonic Output Power Current Consumption FREQUENCY SYNTHESIZER Reference Frequency Reference Counter (R-Counter) Channel Spacing N-Counter Range Synthesizer Frequency Range Phase Noise @ 10kHz Offset VCC Current Consumption of PLL VDD Current Consumption of PLL N = 28B0(H) fsyn = 260.600 MHz Vreg = 0.980 V VDD = 3.3 V fref - fch N fsyn - I I - - - 2810(H) 256.600 - - - 20.95008 09D2(H) 25.000 - - -95 750 70 - - - 2950(H) 264.600 - - - MHz dBc / Hz A A kHz MHz Referenced to 3rd Harmonic Vreg = 0.980 V fLO1 VLO H2 H4 I - - - - - 260.6008 53 -46 -31 1050 - - - - - MHz mV dBc dBc A
NOTES: 1. Output of the LNA is matched to 230 by inserting a 180 resistor in series with its output port. 2. Output of the Mixer is matched to 1.5050 k by inserting a 1500 resistor in series with its output port. 3. The circuit of this test board is the same as the schematic in Figure 2.
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ELECTRICAL CHARACTERISTICS (continued)
Characteristic LNA + SAW FILTER + MIXER Conversion Gain [Note 2] Zout Current Consumption of Mixer CRYSTAL FILTER Insertion Loss IF RECEIVER MC2800 Input Impedance Second Local Oscillator Frequency @ 21.400 MHz Zin fLO2 EN transits from '0' to '1' VCC = 1.15 V - - - - 1090 - j140 20.95008 <1.0 1.45 - - - - MHz ms mA Terminating Impedance = 1.5 k - 1.0 - dB Input @ 282.000 MHz Output @ 21.400 MHz @ 21.400 MHz Vreg = 0.980 V GC Zout I - - - 28.2 1620 - j51 370 - - - dB A Conditions Symbol Min Typ Max Unit
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Startup Time of 2nd LO Current Consumption OVERALL RECEIVER PERFORMANCE (a) Phase A Characteristics [Note 3] RF Input Frequency Sensitivity 6400/4 Level FSK 1600/2 Level FSK Co-channel Rejection Adjacent Channel Rejection Low Side High Side Image Rejection First IF Second IF Intermodulation Rejection Low Side High Side Blocking @ 1.0 MHz @ 5.0 MHz Total Current Consumption Power Up Power Down
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N - Counter = 28B8(H) R1 = '0' R1 = '1'
- - - - - - - - - - - -
282.000 -123 -123 -5.0 56 59 56 51 52 52 73 78 4.3 10
- - - - - -
MHz dBm dBm dB dB
dB 6400/4 Level FSK R1 = '0' 0 - - dB - - dB - - - - mA A
@ VCC = 1.15 V @ VCC = 1.15 V
- -
NOTES: 1. Output of the LNA is matched to 230 by inserting a 180 resistor in series with its output port. 2. Output of the Mixer is matched to 1.5050 k by inserting a 1500 resistor in series with its output port. 3. The circuit of this test board is the same as the schematic in Figure 2.
4
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ELECTRICAL CHARACTERISTICS (continued)
Characteristic (b) Phase B Characteristics [Note 3] RF Input Frequency Sensitivity 6400/4 Level FSK 1600/2 Level FSK Co-channel Rejection Adjacent Channel Rejection Low Side High Side Image Rejection First IF Second IF N - Counter = 28B8(H) R1 = '0' R1 = '1' - - - - - - - - - - - - @ VCC = 1.15 V @ VCC = 1.15 V - - 282.000 -119 -119 -10 56 56 53 50 47 48 69 67 4.3 10 - - - - - - dB 6400/4 Level FSK R1 = '0' 0 - - - - dB - - - - mA A MHz dBm dBm dB dB Conditions Symbol Min Typ Max Unit
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Blocking @ 1.0 MHz @ 5.0 MHz Total Current Consumption Power Up Power Down
NOTES: 1. Output of the LNA is matched to 230 by inserting a 180 resistor in series with its output port. 2. Output of the Mixer is matched to 1.5050 k by inserting a 1500 resistor in series with its output port. 3. The circuit of this test board is the same as the schematic in Figure 2.
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PIN FUNCTION DESCRIPTION
Pin 1 2 3 4 5 6 7 8 9
Symbol
Description
PLL_DATA R1
PLL serial data input. PLL clock signal.
PLL_CLOCK RESET VDD VCC D2 D1
Control bit of the MC2800 bit-rate filter. Default value = `1'. Pre-charge and reset of the MC2800. Default value = `0'. Digital part of PLL and FLEX decoder operating voltage. Battery supplies of MC2800. MC2800 & PLL enable pin. (Vdd when `ON') 2-bit digital outputs of the MC2800. 2-bit digital outputs of the MC2800. PLL input data latch. Ground pin.
ENABLE
10 11
PLL_LATCH Gnd
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Intermodulation Rejection Low Side High Side
dB
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APPLICATION NOTES
This frequency synthesized FLEX paging receiver board uses Motorola's NPN silicon low-noise high-frequency transistors MMBR941LT1 to construct the RF functional blocks, including a LNA, a voltage controlled oscillator (VCO), a frequency multiplier and a mixer. NPC's PLL IC SM5166AV is used as the core of the fractional-N synthesizer. The varactor diode MMBV609LT1 is used in the VCO. The M-ary FSK IF receiver MC2800 performs the second down-conversion and demodulates the received FSK signal into two digital output bits for the baseband. Two general purpose NPN & PNP BJTs, MMBT3904LT1 & MMBT3906LT1 form the RSSI to RF AGC conversion circuit. The LNA employs cascode architecture (Q1 and Q2) with its output being matched to 230 , the input impedance of the 281-MHz SAW filter. The gain of the LNA is controlled by the base voltage of Q2, which is a function of the RSSI output of MC2800. The input matching network should be changed when an antenna precedes the LNA. Special care must be taken in characterizing the LNA and antenna to achieve a good interface match. The frequency synthesizer comprises a VCO, a NPC's PLL IC SM5166AV, a loop filter and a frequency multiplier. The VCO (Q4) uses a modified Colpitts structure with a varactor diode D2 for the frequency tuning. C52 can be adjusted to change the frequency tuning range. The PLL uses an input reference frequency of 20.950 MHz with a divider value of 2514 (decimal), which results in a frequency spacing of 8.333 kHz. The pre-scalar value of the PLL has a control range from 10256 to 10576 (decimal). The loop filter consisting of R26, R27, C64 & C65 has a bandwidth of about 1/10 to 1/15 of the frequency spacing. Q5 is used for frequency multiplication with a ratio of 3. The third harmonic is extracted by the bandpass filter formed by C16, C17, C62, C63 & L11. This results in a synthesized frequency range from 256.600 to 264.600 MHz. For the details of the control of PLL IC, please refer to the data sheet of SM5166AV. A common emitter circuit (Q3) is used as the mixer with both LO and RF being ac-coupled to its base. Its output is dc-coupled to the 21.4-MHz crystal filter. To minimize the distortion of the downconverted frequency spectrum, the filter output must be matched to MIX_IN of the MC2800. For the characteristics of the MC2800 as well as its control (ENABLE & RESET pins) and bit-rate filter (R1 pins) setup, please refer to the MC2800 data sheet. It is recommended that a single ceramic filter configuration be used. That is, a 450-kHz filter (FILTER3 in Figure 2) is inserted between the MIX_OUT and IF1_IN, and a 1.0 F multi-layer ceramic chip capacitor (C73 in Figure 2) is connected between the IF1_OUT and IF2_IN. Although it is noted in the data sheet of MC2800 that 3.0 to 4.0 dB performance degradation is observed in the single ceramic filter application, this performance degradation does not occur in the overall RF/IF system performance. This is because the high gain and the low NF of the RF front-end have effectively reduced the noise contribution of the MC2800 to the overall system. FDB Interface This pager board uses an 11-pin surface mount socket to interface with the pager baseband board. This interface provides 2 digital output pins (D1 & D2), 6 control pins (ENABLE, RESET, R1, PLL_DATA, PLL_CLOCK & PLL_LATCH) and 3 supply pins (VCC, VDD & GND). The pin descriptions are summarized in the following table and the footprint of this socket is depicted in Figure 3. In order to provide default states for these input pins, a pull up resistor (R16) is used at R1 input pin whereas pull down resistors (R17, R20, R21, R22 & R25) are connected at the rest of input pins. Note: For general information regarding FLEX products, please contact the local Motorola SPS sales office or the web at http://www.motorola.com/wireless-semi.
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Figure 3. The Footprint of the 11 Pin Interface Socket
6 7 8 9 10 11
543 21
6
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Figure 4. The PCB Layout of the Receiver Board (Top Layer)
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Figure 5. The PCB Layout of the Receiver Board (Bottom Layer)
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L2 L1, L8 FILTER3 FILTER 2 FILTER1 D2 C68 C65 C64 C56 C55 SAFC281ME75N MXF21.4-15A MMBV609LT1 CFWC450F 0.22 F 2.2 F 33 nH 27 nH 33 nF 56 pF 15 pF X1 U2 U1 R29 R28 R27 R26 R24 R23 R19 20.945000 MHz SM5166AV MC2800 1.5 k 1.1 k 9.1 k 1.6 k 24 k 36 k 910 620
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C51, C63 C48 C50 C67 C69 C39 C34 C33 C32 C30 C29, C31, C44 C28 C22 C21 C18, C62 C16, C45, D1 C12, C20, C47, C54 C41 C11, C52 C9 C7, C49 C6, C8, C13, C24, C35, C36, C37, C38, C40, C42, C61 C5, C10, C15, C25 C4, C19, C23, C53, C57, C58, C59, C60, C66, C70 C3 C2, C17, C26, C27 C1
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100 pF
100 nF
2.0 pF
1.0 nF
7.0 pF
4.0 pF
3.0 pF
33 pF
10 nF
Table 1. Component List
L12, L13
L11
L10
L9
L7
L6
L5
L4
L3
BLM11B750S
820 nH
100 nH
2.7 H
4.7 H
5.6 H
2.2 H
22 nH
39 nH
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Not Used
1.0 F
0.1 F
4.7 F
1.0 pF
3.3 nF
2.2 nF
0.5 pF
10 F
22 nF
47 nF
10 pF
12 pF
22 pF
18 pF
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R18 R11, R12 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 Q7 Q6 Q1, Q2, Q3, Q4, Q5
R13, R14, R15, R16, R17, R20, R21, R22, R25
MMBT3906LT1
MMBT3904LT1
MMBR941LT1
100 k
10 M
7.5 k
8.2 k
2.4 k
2.2 k
6.8 k
820
510
430
200
10
9
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Table 2. SAW Filter Specification Part Number Nominal Center Frequency, fo Insertion Loss SAFC281ME75N [Note] 281.0 MHz
fo - 100 MHz to fo - 37.5 MHz fo 4.0 MHz fo + 37.5 MHz to fo + 100 MHz
Ripple within fo 4.0 MHz/dB Nominal Input / Output impedance
NOTE:
48 dB min 4.5 dB max 40 dB min 2.0 max 230 // - 0.2 pF
SAW filter SAFC281ME75N is the product of muRata Manufacturing Co., Ltd. For further enquiry, please refer to the muRata's product catalog.
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Part Number Nominal Center Frequency, fo Number of Pole Pass Band Width Stop Band Width Pass Band Ripple Insertion Loss Nominal Input / Output impedance
NOTE:
MXF21.4-15A [Note] 21.400000 MHz 1.0 kHz 2 poles -3.0 dB / 7.5 kHz min -18 dB / 25.0 kHz max 0.5 dB max 1.5 dB max 1.5 k // 2.0 pF
Crystal filter MXF21.4-15A is the product of KINSEKI, Ltd. For further enquiry, please refer to the product catalog of Kinseki, Ltd.
Table 4. Ceramic Filter Specification Part Number Nominal Center Frequency, fo 6.0 dB Bandwidth from fo 50 dB Bandwidth from fo Stop Band Attenuation Within fo 100 kHz Ripple within fo 7.5 kHz Nominal Input/Output impedance
NOTE:
CFWC450F [Note] 450 kHz 6.0 kHz 12.5 kHz 50 dB min 3.0 dB max 1.5 k
Ceramic filter CFWC450F is the product of muRata Manufacturing Co., Ltd. For further inquiry, please refer to muRata's product catalog.
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Table 3. Crystal Filter Specification
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Table 5. Quartz Crystal Specification Part Number Nominal Frequency, fo Holder Type Resonance Mode Operating Temperature Frequency Tolerance @ 25C Load Capacitance Equivalent Series Resistance, ESR Shunt Capacitance C0 Drive Level 1U0209450D30F5D0Z [Note] 20.945 MHz UM-1 Fundamental -30 to 80C 20 ppm 30 pF 30 max 7.0 pF 0.5 W 5.0 ppm/year
The quartz crystals are the products of Hong Kong X'TALS Limited. For further inquiry, please refer to the product catalog of Hong Kong X'TALS Limited or hkxtals@HongKongCrystal.com.
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Aging
NOTE:
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MC2800SYNEVK/D 11
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