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SA612AN
Datasheet (Philips)
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Datasheet NE612AN, NE612AD, SA612AD, SA612AN Datasheet (Philips)

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Page 1
RF COMMUNICATIONS PRODUCTS
SA612A
Double-balanced mixer and oscillator
Product specification Replaces data of September 17, 1990
IC17 Data Handbook
Philips Semiconductors
1997 Nov 07
Page 2
SA612ADouble-balanced mixer and oscillator
DESCRIPTION
The SA612A is a low-power VHF monolithic double-balanced mixer with on-board oscillator and voltage regulator. It is intended for low cost, low power communication systems with signal frequencies to 500MHz and local oscillator frequencies as high as 200MHz. The mixer is a “Gilbert cell” multiplier configuration which provides gain of 14dB or more at 45MHz.
The oscillator can be configured for a crystal, a tuned tank operation, or as a buffer for an external L.O. Noise figure at 45MHz is typically below 6dB and makes the device well suited for high performance cordless phone/cellular radio. The low power consumption makes the SA612A excellent for battery operated equipment. Networking and other communications products can benefit from very low radiated energy levels within systems. The SA612A is available in an 8-lead dual in-line plastic package and an 8-lead SO (surface mounted miniature package).
FEA TURES
•Low current consumption
•Low cost
•Operation to 500MHz
•Low radiated energy
•Low external parts count; suitable for crystal/ceramic filter
•Excellent sensitivity, gain, and noise figure
PIN CONFIGURATION
D, N Packages
1
INPUT A
2
INPUT B
3
GND
OUTPUT A
4
Figure 1. Pin Configuration
APPLICATIONS
•Cordless telephone
•Portable radio
•VHF transceivers
•RF data links
•Sonabuoys
•Communications receivers
•Broadband LANs
•HF and VHF frequency conversion
•Cellular radio mixer/oscillator
8
V
CC
7
OSCILLATOR
6
OSCILLATOR
5
OUTPUT B
SR00098
ORDERING INFORMATION
DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #
8-Pin Plastic Dual In-Line Plastic (DIP) -40 to +85°C SA612AN SOT97-1 8-Pin Plastic Small Outline (SO) package (Surface-Mount) -40 to +85°C SA612AD SOT96-1
BLOCK DIAGRAM
8765
V
CC
VOLTAGE
REGULATOR
OSCILLATOR
GROUND
4321
SR00099
Figure 2. Block Diagram
1997 Nov 07 853-0391 18662
2
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SYMBOL
PARAMETER
TEST CONDITION
UNIT
SA612ADouble-balanced mixer and oscillator
ABSOLUTE MAXIMUM RATINGS
SYMBOL PARAMETER RATING UNIT
V
CC
T
STG
T
A
AC/DC ELECTRICAL CHARACTERISTICS
TA=25°C, V
V
CC
f
IN
f
OSC
R
IN
C
IN
= 6V , Figure 3
CC
Maximum operating voltage 9 V Storage temperature -65 to +150 °C Operating ambient temperature range SA612A -40 to +85 °C
LIMITS
Min Typ Max
Power supply voltage range 4.5 8.0 V DC current drain 2.4 3.0 mA Input signal frequency 500 MHz Oscillator frequency 200 MHz Noise figured at 45MHz 5.0 dB Third-order intercept point at 45MHz RFIN=-45dBm -13 dBm Conversion gain at 45MHz 14 17 dB RF input resistance 1.5 kΩ RF input capacitance 3 pF Mixer output resistance (Pin 4 or 5) 1.5 kΩ
DESCRIPTION OF OPERATION
The SA612A 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 SA612A is designed for optimum low power performance. When used with the SA614A as a 45MHz cordless phone/cellular
radio 2nd IF and demodulator , the SA612A is capable of receiving
-119dBm signals with a 12dB S/N ratio. Third-order intercept is typically -15dBm (that’s 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 not critical, the input to the SA612A should be appropriately scaled.
1997 Nov 07
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SA612ADouble-balanced mixer and oscillator
TEST CONFIGURA TION
0.5 to 1.3µH
22pF
34.545MHz THIRD OVERTONE CRYSTAL
10pF
150pF
6.8µF
V
CC
5.5µH
100nF
1nF
10nF
8765
47pF
INPUT
220pF
18k
6
7
25k
BUFFER
BIAS
44.2µH
4321
0.209 to
0.283µH
100nF
612A
Figure 3. Test Configuration
8
V
CC
1.5k
45
1.5k
1.5 to
OUTPUT
330pF
120pF
SR00101
BIAS
1997 Nov 07
1
1.5k 3
GND
1.5k
2
BIAS
SR00102
Figure 4. Equivalent Circuit
4
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SA612ADouble-balanced mixer and oscillator
Besides excellent low power performance well into VHF, the SA612A is designed to be flexible. The input, 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.
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 L.O. is beyond oscillation limits, or the system calls for an external L.O., the
612A
external signal can be injected at Pin 6 through a DC blocking capacitor. External L.O. should be 200mV
minimum to 300mV
P-P
maximum. Figure 7 shows several proven oscillator circuits. Figure 7a is
appropriate for cordless phones/cellular radio. In this circuit a third overtone parallel-mode crystal with approximately 5pF load capacitance should be specified. Capacitor C3 and inductor L1 act as a fundamental trap. In fundamental mode oscillation the trap is omitted.
Figure 8 shows a Colpitts varacter 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 circuits 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 assume correct system operation.
612A
P-P
INPUT
12
a. Single-Ended Tuned Input b. Balanced Input (For Attenuation
12
of Second-Order Products)
Figure 5. Input Configuration
612A
12
c. Single-Ended Untuned Input
SR00103
1997 Nov 07
5
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SA612ADouble-balanced mixer and oscillator
C
12pF
*
T
5
CFU455
612A
a. Single-Ended Ceramic Filter b. Single-Ended Crystal Filter
612A
c. Single-Ended IFT d.. Balanced Output
or Equivalent
4
5
4
612A
5
4
Figure 6. Output Configuration
Filter K&L 38780 or Equivalent
*C
matches 3.5kΩ to next stage
T
5
612A
4
SR00104
L
1
C
3
8
1
a. Colpitts Crystal Oscillator
(Overtone Mode)
C
2
XTAL
C
1
7
612A
2
3
5
6
4
TC02101S TC02111S TC02121S
1
7
8
2
b. Colpitts L/C Tank Oscillator
6
612A
3
5
4
1
7
8
612A
2
c. Hartley L/C Tank Oscillator
3
5
6
4
SR00105
Figure 7. Oscillator Circuits
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SA612ADouble-balanced mixer and oscillator
5.5µH
+6V
0.10pF
10µF
0.1µF
2pF
100k
100k
100k
2k
1.0nF
1
2
3
4
330
612A
0.01µF
3SK126
0.01pF
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
2N918
1997 Nov 07
SR00106
Figure 8. Colpitts Oscillator Suitable for Synthesizer Applications and Typical Buffers
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SA612ADouble-balanced mixer and oscillator
TEST CONFIGURA TION
6.8µF
V
CC
45MHz IN
100nF
INPUT
5.5µH
10nF
0.5 to 1.3µH
1nF
8765
22pF
5.6pF
44.545MHz THIRD OVERTONE CRYSTAL
612A
47pF
0.209 to 0.283µH
220pF
100nF
Figure 9. Typical Application for Cordless/Cellular Radio
4321
SFG455A3
OR EQUIVALENT
455kHZ
SR00107
1997 Nov 07
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SA612ADouble-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
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
TEMPERATURE
O
C
Figure 12. Third-Order Intercept Point
SR00108
SR00109
SR00110
8.5V
6.0V
4.5V
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
–80 –60 –40 –20 0 20
3rd ORDER PRODUCT
RF INPUT LEVEL (dBm)
Figure 14. Third-Order Intercept and Compression
–10
–11
–12
–13
–14
–15
INTERCEPT (dBm)
–16
–17
–18
45678 910
VCC (VOLTS)
Figure 15. Input Third-Order Intermod Point vs V
4.5V
6.0V
8.5V
SR00111
SR00112
SR00113
CC
1997 Nov 07
9
Page 10
Double-balanced mixer oscillator
SO8: plastic small outline package; 8 leads; body width 3.9mm SOT96-1
SA612
1997 Nov 07
10
Page 11
Double-balanced mixer oscillator
DIP8: plastic dual in-line package; 8 leads (300 mil) SOT97-1
SA612
1997 Nov 07
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Double-balanced mixer oscillator
SA612
DEFINITIONS
Data Sheet Identification Product Status Definition
Objective Specification
Preliminary Specification
Product Specification
Formative or in Design
Preproduction Product
Full Production
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.
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
Copyright Philips Electronics North America Corporation 1997
All rights reserved. Printed in U.S.A.
P.O. Box 3409 Sunnyvale, California 94088–3409 Telephone 800-234-7381
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1997 Nov 07
12
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