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RF COMMUNICATIONS PRODUCTS
SA602A Double-balanced mixer and oscillator
Product specification Replaces datasheet of April 17, 1990 IC17 Data Handbook 1997 Nov 07
Philips Semiconductors
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
DESCRIPTION
The SA602A is a low-power VHF monolithic double-balanced mixer with input amplifier, on-board oscillator, and voltage regulator. It is intended for high performance, low power communication systems. The guaranteed parameters of the SA602A make this device particularly well suited for cellular radio applications. The mixer is a "Gilbert cell" multiplier configuration which typically provides 18dB of gain at 45MHz. The oscillator will operate to 200MHz. It can be configured as a crystal oscillator, a tuned tank oscillator, or a buffer for an external LO. For higher frequencies the LO input may be externally driven. The noise figure at 45MHz is typically less than 5dB. The gain, intercept performance, low-power and noise characteristics make the SA602A a superior choice for high-performance battery operated equipment. It is available in an 8-lead dual in-line plastic package and an 8-lead SO (surface-mount miniature package).
PIN CONFIGURATION
D and N Packages
1 2 3 4 8 7 6 5
INA INB GND OUTA
VCC OSCE OSCB OUTB
SR00068
Figure 1. Pin Configuration
APPLICATIONS
FEATURES
* Low current consumption: 2.4mA typical * Excellent noise figure: <4.7dB typical at 45MHz * High operating frequency * Excellent gain, intercept and sensitivity * Low external parts count; suitable for crystal/ceramic filters * SA602A meets cellular radio specifications
ORDERING INFORMATION
DESCRIPTION 8-Pin Plastic Dual In-Line Plastic (DIP) 8-Pin Plastic Small Outline (SO) package (Surface-mount)
* Cellular radio mixer/oscillator * Portable radio * VHF transceivers * RF data links * HF/VHF frequency conversion * Instrumentation frequency conversion * Broadband LANs
TEMPERATURE RANGE -40 to +85C -40 to +85C
ORDER CODE SA602AN SA602AD
DWG # SOT97-1 SOT96-1
ABSOLUTE MAXIMUM RATINGS
SYMBOL VCC TSTG TA JA Maximum operating voltage Storage temperature range Operating ambient temperature range SA602A Thermal impedance D package N package PARAMETER RATING 9 -65 to +150 -40 to +85 90 75 UNITS V C C C/W C/W
1997 Nov 07
2
853-1424 18662
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
BLOCK DIAGRAM
8
V CC VOLTAGE REGULATOR
7
6
5
OSCILLATOR
GROUND
1
2
3
4
SR00069
Figure 2. Block Diagram
AC/DC ELECTRICAL CHARACTERISTICS
VCC = +6V, TA = 25C; unless otherwise stated. LIMITS SYMBOL VCC fIN fOSC PARAMETER Power supply voltage range DC current drain Input signal frequency Oscillator frequency Noise figure at 45MHz Third-order intercept point Conversion gain at 45MHz RIN CIN RF input resistance RF input capacitance Mixer output resistance (Pin 4 or 5) RFIN = -45dBm: f1 = 45.0MHz f2 = 45.06MHz 14 1.5 3 1.5 3.5 TEST CONDITIONS MIN 4.5 2.4 500 200 5.0 -13 17 5.5 -15 SA602A TYP MAX 8.0 2.8 V mA MHz MHz dB dBm dB k pF k UNITS
DESCRIPTION OF OPERATION
The SA602A is a Gilbert cell, an oscillator/buffer, and a temperature compensated bias network as shown in the equivalent circuit. The Gilbert cell is a differential amplifier (Pins 1 and 2) which drives a balanced switching cell. The differential input stage provides gain and determines the noise figure and signal handling performance of the system. The SA602A is designed for optimum low power performance. When used with the SA604 as a 45MHz cellular radio second IF and demodulator, the SA602A is capable of receiving -119dBm signals with a 12dB S/N ratio. Third-order intercept is typically -13dBm (that is approximately +5dBm output intercept because of the RF gain). The system designer must be cognizant of this large signal limitation. When designing LANs or other closed systems where transmission levels are high, and small-signal or signal-to-noise issues are not critical, the input to the SA602A should be appropriately scaled.
Besides excellent low power performance well into VHF, the SA602A is designed to be flexible. The input, RF mixer output and oscillator ports can support a variety of configurations provided the designer understands certain constraints, which will be explained here. The RF inputs (Pins 1 and 2) are biased internally. They are symmetrical. The equivalent AC input impedance is approximately 1.5k || 3pF through 50MHz. Pins 1 and 2 can be used interchangeably, but they should not be DC biased externally. Figure 5 shows three typical input configurations. The mixer outputs (Pins 4 and 5) are also internally biased. Each output is connected to the internal positive supply by a 1.5k resistor. This permits direct output termination yet allows for balanced output as well. Figure 6 shows three single ended output configurations and a balanced output.
1997 Nov 07
3
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
The oscillator is capable of sustaining oscillation beyond 200MHz in crystal or tuned tank configurations. The upper limit of operation is determined by tank "Q" and required drive levels. The higher the "Q" of the tank or the smaller the required drive, the higher the permissible oscillation frequency. If the required LO is beyond oscillation limits, or the system calls for an external LO, the external signal can be injected at Pin 6 through a DC blocking capacitor. External LO should be at least 200mVP-P. Figure 7 shows several proven oscillator circuits. Figure 7a is appropriate for cellular radio. As shown, an overtone mode of operation is utilized. Capacitor C3 and inductor L1 suppress oscillation at the crystal fundamental frequency. In the fundamental mode, the suppression network is omitted. Figure 8 shows a Colpitts varactor tuned tank oscillator suitable for synthesizer-controlled applications. It is important to buffer the
output of this circuit to assure that switching spikes from the first counter or prescaler do not end up in the oscillator spectrum. The dual-gate MOSFET provides optimum isolation with low current. The FET offers good isolation, simplicity, and low current, while the bipolar transistors provide the simple solution for non-critical applications. The resistive divider in the emitter-follower circuit should be chosen to provide the minimum input signal which will assure correct system operation. When operated above 100MHz, the oscillator may not start if the Q of the tank is too low. A 22k resistor from Pin 7 to ground will increase the DC bias current of the oscillator transistor. This improves the AC operating characteristic of the transistor and should help the oscillator to start. A 22k resistor will not upset the other DC biasing internal to the device, but smaller resistance values should be avoided.
0.5 to 1.3H 22pF 5.5H VCC 6.8F 100nF 10nF 1nF 10pF 34.545MHz THIRD OVERTONE CRYSTAL
8
7
6
5
150pF OUTPUT
602A
1.5 to 44.2H 330pF
120pF
1
47pF INPUT 220pF 100nF 0.209 to 0.283H
2
3
4
SR00070
Figure 3. Test Configuration
1997 Nov 07
4
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
8
VCC
18k 6 7 25k BUFFER 1.5k 4 1.5k 5
BIAS
BIAS
2 1
BIAS 1.5k 3 GND 1.5k
SR00071
Figure 4. Equivalent Circuit
602A
602A 602A
1 INPUT
2
1
2 1 2
a. Single-Ended Tuned Input
b. Balanced Input (For Attenuation of Second-Order Products)
c. Single-Ended Untuned Input SR00072
Figure 5. Input Configuration
1997 Nov 07
5
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
5
5
602A
602A
4
4
a. Single-Ended Ceramic Filter
b. Single-Ended Crystal Filter
5
5
602A
602A
4
4
c. Single-Ended IFT
d.. Balanced Output
SR00073
Figure 6. Output Configuration
L1
C3
C2 XTAL
8
7
C1
6
5
8
7
6
5
8
7
6
5
602A
602A
602A
1
2
3
4
1
2
3
4
1
2
3
4
a. Colpitts Crystal Oscillator (Overtone Mode)
b. Colpitts L/C Tank Oscillator
c. Hartley L/C Tank Oscillator
SR00074
Figure 7. Oscillator Circuits
1997 Nov 07
6
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
5.5H +6V 0.10pF 10F 0.1F
1
8
2 602A
7 7pF 10pF
TO BUFFER
3
6 1000pF
4
5 1000pF 0.06H
DC CONTROL VOLTAGE FROM SYNTHESIZER
MV2105 OR EQUIVALENT
0.01F
100k
2k
3SK126 2N918 2N5484
2pF
TO SYNTHESIZER
100k 100k
330 1.0nF
0.01F
TO SYNTHESIZER
SR00075
Figure 8. Colpitts Oscillator Suitable for Synthesizer Applications and Typical Buffers
0.5 to 1.3H
22pF 34.545MHz THIRD OVERTONE CRYSTAL 1nF 10pF
VCC 6.8F 100nF 10nF
8
7
6
5
602A
1
47pF INPUT 220pF 100nF 0.209 to 0.283H
2
3
4
SFG455A3 OR EQUIVALENT
SR00076
Figure 9. Typical Application for Cellular Radio
1997 Nov 07
7
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
3.50 3.25 SUPPLY CURRENT 9mA) 3.00 2.75 2.50 2.25 2.00 1.75 1.50 -40 -30 -20 -10 0 10 20 30 40 TEMPERATURE OC 50 60 70 80 90 8.5V 6.0V 4.5V NOISE FIGURE (dB)
6.00 5.75 5.50 5.25 5.00 4.75 4.50 4.25 4.00 -40 -30 -20 -10 4.5V 6.0V 8.5V
0
10 20 30 40 50 TEMPERATURE OC
60 70
80 90
SR00080 SR00077
Figure 10. ICC vs Supply Voltage
20.0 19.5 19.0 CONVERSION GAIN (dB) 18.5 18.0 17.5 17.0 16.5 16.0 15.5 15.0 14.5 14.0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 IF OUTPUT POWER (dBm) 6.0V 8.5V 4.5V 0
Figure 13. Noise Figure
RF1 = 45MHz, IF = 455kHz, RF2 = 45.06MHz 3rd ORDER PRODUCT 20
-20
FUND. PRODUCT
-40
-60
TEMPERATURE OC
SR00078
-80
-60
Figure 11. Conversion Gain vs Supply Voltage
-40 -20 0 RF INPUT LEVEL (dBm)
20
SR00081
Figure 14. Third-Order Intercept and Compression
-10.0 -10.5 INPUT INTERCEPT POINT (dBm) -11.0 -11.5 -12.5 -13.0 -13.5 -14.0 -14.5 -15.0 -15.5 -16.0 -16.5 -17.0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 -18 INTERCEPT (dBm) -12.0 -10 -11 -12 -13 -14 -15 -16 -17
4
5
6
7
8
9
10
TEMPERATURE OC
VCC (VOLTS)
SR00079
SR00082
Figure 12. Third-Order Intercept Point
Figure 15. Input Third-Order Intermod Point vs VCC
1997 Nov 07
8
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
SO8: plastic small outline package; 8 leads; body width 3.9mm
SOT96-1
1997 Nov 07
9
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
DIP8: plastic dual in-line package; 8 leads (300 mil)
SOT97-1
1997 Nov 07
10
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
DEFINITIONS
Data Sheet Identification
Objective Specification
Product Status
Formative or in Design
Definition
This data sheet contains the design target or goal specifications for product development. Specifications may change in any manner without notice. This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes at any time without notice, in order to improve design and supply the best possible product.
Preliminary Specification
Preproduction Product
Product Specification
Full Production
Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. LIFE SUPPORT APPLICATIONS Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices, or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale. Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088-3409 Telephone 800-234-7381 (c) Copyright Philips Electronics North America Corporation 1997 All rights reserved. Printed in U.S.A.
Philips Semiconductors
1997 Nov 07 11

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