Page 1
RF COMMUNICATIONS PRODUCTS
SA602A
Double-balanced mixer and oscillator
Product specification
Replaces datasheet of April 17, 1990
IC17 Data Handbook
Philips Semiconductors
1997 Nov 07
Page 2
Philips Semiconductors Product specification
SA602ADouble-balanced mixer and oscillator
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).
FEA TURES
•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
PIN CONFIGURATION
D and N Packages
1
IN
A
2
IN
B
3
GND
45
OUT
A
Figure 1. Pin Configuration
APPLICATIONS
•Cellular radio mixer/oscillator
•Portable radio
•VHF transceivers
•RF data links
•HF/VHF frequency conversion
•Instrumentation frequency conversion
•Broadband LANs
8
V
CC
7
OSC
E
6
OSC
B
OUT
B
SR00068
ORDERING INFORMATION
DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #
8-Pin Plastic Dual In-Line Plastic (DIP) -40 to +85°C SA602AN SOT97-1
8-Pin Plastic Small Outline (SO) package (Surface-mount) -40 to +85°C SA602AD SOT96-1
ABSOLUTE MAXIMUM RATINGS
SYMBOL PARAMETER RATING UNITS
T
V
θ
CC
STG
T
A
JA
Maximum operating voltage 9 V
Storage temperature range -65 to +150 °C
Operating ambient temperature range SA602A -40 to +85 °C
Thermal impedance D package 90 °C/W
N package 75 °C/W
1997 Nov 07 853-1424 18662
2
Page 3
Philips Semiconductors Product specification
SA602ADouble-balanced mixer and oscillator
BLOCK DIAGRAM
8765
V
CC
VOLTAGE
REGULATOR
OSCILLATOR
GROUND
4321
SR00069
Figure 2. Block Diagram
AC/DC ELECTRICAL CHARACTERISTICS
VCC = +6V, TA = 25°C; unless otherwise stated.
LIMITS
SYMBOL PARAMETER TEST CONDITIONS SA602A UNITS
MIN TYP MAX
V
f
OSC
R
C
Power supply voltage range 4.5 8.0 V
CC
DC current drain 2.4 2.8 mA
f
Input signal frequency 500 MHz
IN
Oscillator frequency 200 MHz
Noise figure at 45MHz 5.0 5.5 dB
Third-order intercept point
RFIN = -45dBm: f1 = 45.0MHz
f
= 45.06MHz
2
-13 -15 dBm
Conversion gain at 45MHz 14 17 dB
RF input resistance 1.5 kΩ
IN
RF input capacitance 3 3.5 pF
IN
Mixer output resistance (Pin 4 or 5) 1.5 kΩ
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.
1997 Nov 07
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 1.5kΩ
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.
3
Page 4
Philips Semiconductors Product specification
SA602ADouble-balanced mixer and oscillator
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 200mV
P-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
0.5 to 1.3µH
6.8µF
V
CC
5.5µH
100nF
10nF
1nF
8765
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 22kΩ 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 22kΩ resistor will not upset the
other DC biasing internal to the device, but smaller resistance
values should be avoided.
22pF
602A
34.545MHz THIRD OVERTONE CRYSTAL
10pF
1.5 to
44.2µH
150pF
OUTPUT
330pF
INPUT
120pF
4321
47pF
0.209 to 0.283µH
220pF
100nF
SR00070
Figure 3. Test Configuration
1997 Nov 07
4
Page 5
Philips Semiconductors Product specification
SA602ADouble-balanced mixer and oscillator
8
V
CC
18k
6
7
25k
BUFFER
1.5k
45
1.5k
INPUT
602A
12
BIAS
1
1.5k
Figure 4. Equivalent Circuit
12
602A
3
GND
BIAS
2
BIAS
1.5k
SR00071
602A
12
1997 Nov 07
a. Single-Ended Tuned Input b. Balanced Input (For Attenuation
of Second-Order Products)
Figure 5. Input Configuration
5
c. Single-Ended Untuned Input
SR00072
Page 6
Philips Semiconductors Product specification
SA602ADouble-balanced mixer and oscillator
5
602A
4
a. Single-Ended Ceramic Filter b. Single-Ended Crystal Filter
5
602A
4
c. Single-Ended IFT d.. Balanced Output
602A
5
4
Figure 6. Output Configuration
5
602A
4
SR00073
L
1
C
3
8
1
a. Colpitts Crystal Oscillator
(Overtone Mode)
C
2
XTAL
C
1
7
602A
2
3
5
6
4
1
7
8
602A
2
b. Colpitts L/C Tank Oscillator
3
5
6
4
1
7
8
602A
2
c. Hartley L/C Tank Oscillator
3
5
6
4
SR00074
Figure 7. Oscillator Circuits
1997 Nov 07
6
Page 7
Philips Semiconductors Product specification
SA602ADouble-balanced mixer and oscillator
5.5µH
+6V
0.10pF
10µF
0.1µF
2pF
100k
100k
100k
2k
1.0nF
1
2
3
4
330
602A
0.01µF
3SK126
TO SYNTHESIZER
0.01µF
8
7
10pF
7pF
6
1000pF
5
0.06µH
1000pF
2N5484
TO
BUFFER
DC CONTROL VOLTAGE
FROM SYNTHESIZER
MV2105
OR EQUIVALENT
TO SYNTHESIZER
Figure 8. Colpitts Oscillator Suitable for Synthesizer Applications and Typical Buffers
2N918
SR00075
1997 Nov 07
6.8µF
0.5 to 1.3µH
V
CC
100nF
10nF
1nF
8765
22pF
34.545MHz THIRD OVERTONE CRYSTAL
10pF
602A
INPUT
4321
47pF
0.209 to 0.283µH
220pF
100nF
SFG455A3
OR EQUIVALENT
SR00076
Figure 9. Typical Application for Cellular Radio
7
Page 8
Philips Semiconductors Product specification
SA602ADouble-balanced mixer and oscillator
3.50
3.25
3.00
2.75
2.50
2.25
SUPPLY CURRENT 9mA)
2.00
1.75
1.50
–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90
TEMPERATURE OC
Figure 10. ICC vs Supply
Voltage
20.0
19.5
19.0
18.5
18.0
17.5
17.0
16.5
16.0
15.5
CONVERSION GAIN (dB)
15.0
14.5
14.0
–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90
TEMPERATURE OC
8.5V
6.0V
4.5V
SR00077
6.0V
8.5V
4.5V
6.00
5.75
5.50
5.25
5.00
NOISE FIGURE (dB)
4.75
4.50
4.25
4.00
–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90
TEMPERATURE OC
Figure 13. Noise Figure
RF
= 45MHz, IF = 455kHz, RF2 = 45.06MHz
1
20
0
–20
FUND. PRODUCT
–40
IF OUTPUT POWER (dBm)
–60
3rd ORDER PRODUCT
4.5V
6.0V
8.5V
SR00080
Figure 11. Conversion Gain vs Supply Voltage
–10.0
–10.5
–11.0
–11.5
–12.0
–12.5
–13.0
–13.5
–14.0
–14.5
–15.0
INPUT INTERCEPT POINT (dBm)
–15.5
–16.0
–16.5
–17.0
–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90
Figure 12. Third-Order Intercept Point
1997 Nov 07
TEMPERATURE
SR00078
–80 –60 –40 –20 0 20
RF INPUT LEVEL (dBm)
SR00081
Figure 14. Third-Order Intercept and Compression
–10
–11
–12
–13
–14
–15
INTERCEPT (dBm)
–16
–17
–18
O
C
SR00079
Figure 15. Input Third-Order Intermod Point vs V
45678 910
VCC (VOLTS)
SR00082
CC
8
Page 9
Philips Semiconductors Product specification
SA602ADouble-balanced mixer and oscillator
SO8: plastic small outline package; 8 leads; body width 3.9mm SOT96-1
1997 Nov 07
9
Page 10
Philips Semiconductors Product specification
SA602ADouble-balanced mixer and oscillator
DIP8: plastic dual in-line package; 8 leads (300 mil) SOT97-1
1997 Nov 07
10
Page 11
Philips Semiconductors Product specification
SA602ADouble-balanced mixer and oscillator
DEFINITIONS
Data Sheet Identification Product Status Definition
Objective Specification
Preliminary Specification
Product Specification
Formative or in Design
Preproduction Product
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 APPLICA TIONS
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
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.
Copyright Philips Electronics North America Corporation 1997
All rights reserved. Printed in U.S.A.
1997 Nov 07
11
Loading...