SA602AD/01-T [NXP]
Double-balanced mixer and oscillator;
| 型号： | SA602AD/01-T |
| 厂家： | 
NXP |
| 描述： | Double-balanced mixer and oscillator |
| 文件： | 总11页 (文件大小：113K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RF COMMUNICATIONS PRODUCTS
SA602A
Double-balanced mixer and oscillator
Product specification
Replaces datasheet of April 17, 1990
1997 Nov 07
IC17 Data Handbook
Philip s Se m ic ond uc tors
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
DESCRIPTION
PIN CONFIGURATION
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).
D and N Packages
1
2
3
4
8
7
6
5
IN
IN
V
A
B
CC
OSC
E
GND
OUT
OSC
B
B
OUT
A
SR00068
Figure 1. Pin Configuration
APPLICATIONS
• Cellular radio mixer/oscillator
• Portable radio
FEATURES
• Low current consumption: 2.4mA typical
• VHF transceivers
• Excellent noise figure: <4.7dB typical at 45MHz
• High operating frequency
• RF data links
• HF/VHF frequency conversion
• Instrumentation frequency conversion
• Broadband LANs
• 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)
TEMPERATURE RANGE
-40 to +85°C
ORDER CODE
SA602AN
DWG #
SOT97-1
SOT96-1
8-Pin Plastic Small Outline (SO) package (Surface-mount)
-40 to +85°C
SA602AD
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
RATING
UNITS
V
V
CC
Maximum operating voltage
Storage temperature range
9
-65 to +150
-40 to +85
90
T
STG
°C
T
A
Operating ambient temperature range SA602A
°C
θ
Thermal impedance
D package
N package
°C/W
°C/W
JA
75
2
1997 Nov 07
853-1424 18662
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
BLOCK DIAGRAM
8
7
6
5
V
CC
OSCILLATOR
VOLTAGE
REGULATOR
GROUND
1
2
3
4
SR00069
Figure 2. Block Diagram
AC/DC ELECTRICAL CHARACTERISTICS
V
CC
= +6V, T = 25°C; unless otherwise stated.
A
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
SA602A
TYP
UNITS
MIN
MAX
8.0
V
f
Power supply voltage range
DC current drain
4.5
V
CC
2.4
500
200
5.0
2.8
mA
MHz
MHz
dB
Input signal frequency
Oscillator frequency
Noise figure at 45MHz
IN
f
OSC
5.5
-15
RF = -45dBm: f = 45.0MHz
IN
1
Third-order intercept point
-13
17
dBm
f = 45.06MHz
2
Conversion gain at 45MHz
RF input resistance
14
dB
kΩ
pF
kΩ
R
C
1.5
IN
IN
RF input capacitance
Mixer output resistance
3
3.5
(Pin 4 or 5)
1.5
Besides excellent low power performance well into VHF, the
DESCRIPTION OF OPERATION
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 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 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 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.
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
1997 Nov 07
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.
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.
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.
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.
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
22pF
34.545MHz THIRD OVERTONE CRYSTAL
10pF
5.5µH
1nF
V
CC
100nF
6.8µF
10nF
8
7
6
5
150pF
OUTPUT
1.5 to
44.2µH
602A
330pF
120pF
1
2
3
4
47pF
0.209 to 0.283µH
INPUT
220pF
100nF
SR00070
Figure 3. Test Configuration
4
1997 Nov 07
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
8
V
CC
18k
BUFFER
6
7
1.5k
4
1.5k
5
25k
BIAS
BIAS
2
1
BIAS
1.5k
1.5k
3
GND
SR00071
Figure 4. Equivalent Circuit
602A
602A
602A
1
2
1
2
1
2
INPUT
a. Single-Ended Tuned Input
b. Balanced Input (For Attenuation
of Second-Order Products)
c. Single-Ended Untuned Input
SR00072
Figure 5. Input Configuration
5
1997 Nov 07
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
L
C
1
2
C
3
XTAL
C
1
8
7
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)
c. Hartley L/C Tank Oscillator
SR00074
b. Colpitts L/C Tank Oscillator
Figure 7. Oscillator Circuits
6
1997 Nov 07
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
5.5µH
+6V
0.1µF
10µF
0.10pF
1
2
8
7
TO
BUFFER
602A
10pF
7pF
3
4
6
5
1000pF
DC CONTROL VOLTAGE
FROM SYNTHESIZER
1000pF
0.06µH
MV2105
OR EQUIVALENT
0.01µF
100k
2k
3SK126
2N918
2N5484
2pF
TO SYNTHESIZER
0.01µF
330
100k
TO SYNTHESIZER
100k
1.0nF
SR00075
Figure 8. Colpitts Oscillator Suitable for Synthesizer Applications and Typical Buffers
0.5 to 1.3µH
22pF
34.545MHz THIRD OVERTONE CRYSTAL
1nF
10pF
V
CC
100nF
6.8µF
10nF
8
7
6
5
602A
1
2
3
4
SFG455A3
OR EQUIVALENT
47pF
0.209 to 0.283µH
INPUT
220pF
100nF
SR00076
Figure 9. Typical Application for Cellular Radio
7
1997 Nov 07
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
3.50
3.25
6.00
5.75
5.50
5.25
5.00
4.75
4.50
4.5V
6.0V
8.5V
3.00
2.75
2.50
2.25
2.00
1.75
1.50
8.5V
6.0V
4.5V
4.25
4.00
–40 –30 –20 –10
0
10 20 30 40 50 60 70 80 90
–40 –30 –20 –10
0
10 20 30 40 50 60 70 80 90
O
O
TEMPERATURE
C
TEMPERATURE
C
SR00080
SR00077
Figure 13. Noise Figure
Figure 10. I vs Supply
CC
Voltage
RF = 45MHz, IF = 455kHz, RF = 45.06MHz
1
2
20.0
3rd ORDER PRODUCT
19.5
19.0
20
0
18.5
18.0
17.5
6.0V
8.5V
4.5V
17.0
16.5
–20
–40
FUND. PRODUCT
16.0
15.5
15.0
14.5
14.0
–60
–40 –30 –20 –10
0
10 20 30 40 50 60 70 80 90
O
TEMPERATURE
C
–80
–60
–40
–20
0
20
SR00078
RF INPUT LEVEL (dBm)
SR00081
Figure 11. Conversion Gain vs Supply Voltage
Figure 14. Third-Order Intercept and Compression
–10.0
–10
–11
–12
–13
–14
–15
–10.5
–11.0
–11.5
–12.0
–12.5
–13.0
–13.5
–14.0
–14.5
–15.0
–16
–17
–18
–15.5
–16.0
–16.5
–17.0
–40 –30 –20 –10
0
10 20 30 40 50 60 70 80 90
O
4
5
6
7
8
9
10
TEMPERATURE
C
V
(VOLTS)
CC
SR00082
SR00079
Figure 12. Third-Order Intercept Point
Figure 15. Input Third-Order Intermod Point vs V
CC
8
1997 Nov 07
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
SO8: plastic small outline package; 8 leads; body width 3.9mm
SOT96-1
9
1997 Nov 07
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
DIP8: plastic dual in-line package; 8 leads (300 mil)
SOT97-1
10
1997 Nov 07
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
DEFINITIONS
Data Sheet Identification
Product Status
Definition
This data sheet contains the design target or goal specifications for product development. Specifications
may change in any manner without notice.
Objective Specification
Formative or in Design
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.
Preliminary Specification
Product Specification
Preproduction Product
Full Production
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. PhilipsSemiconductorsmakesnorepresentationorwarrantythatsuchapplicationswillbesuitableforthespecifiedusewithoutfurthertesting
or modification.
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Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices,
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Copyright Philips Electronics North America Corporation 1997
All rights reserved. Printed in U.S.A.
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Semiconductors
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