NE612A [NXP]
Double-balanced mixer and oscillator; 双平衡混频器和振荡器
| 型号： | NE612A |
| 厂家： | 
NXP |
| 描述： | Double-balanced mixer and oscillator |
| 文件： | 总8页 (文件大小：164K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
NE/SA612A
DESCRIPTION
PIN CONFIGURATION
The NE/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.
D, N Packages
1
2
3
4
8
7
6
5
INPUT A
INPUT B
GND
V
CC
OSCILLATOR
OSCILLATOR
OUTPUT B
SR00098
OUTPUT A
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 NE/SA612A excellent for battery operated
equipment. Networking and other communications products can
benefit from very low radiated energy levels within systems. The
NE/SA612A is available in an 8-lead dual in-line plastic package and
an 8-lead SO (surface mounted miniature package).
Figure 1. Pin Configuration
APPLICATIONS
• Cordless telephone
• Portable radio
• VHF transceivers
FEATURES
• Low current consumption
• RF data links
• Sonabuoys
• Low cost
• Communications receivers
• Broadband LANs
• Operation to 500MHz
• Low radiated energy
• HF and VHF frequency conversion
• Cellular radio mixer/oscillator
• Low external parts count; suitable for crystal/ceramic filter
• Excellent sensitivity, gain, and noise figure
ORDERING INFORMATION
DESCRIPTION
TEMPERATURE RANGE
0 to +70°C
ORDER CODE
DWG #
SOT97-1
SOT96-1
SOT97-1
SOT96-1
8-Pin Plastic Dual In-Line Plastic (DIP)
8-Pin Plastic Small Outline (SO) package (Surface-Mount)
8-Pin Plastic Dual In-Line Plastic (DIP)
8-Pin Plastic Small Outline (SO) package (Surface-Mount)
NE612AN
NE612AD
SA612AN
SA612AD
0 to +70°C
-40 to +85°C
-40 to +85°C
BLOCK DIAGRAM
8
7
6
5
V
CC
OSCILLATOR
VOLTAGE
REGULATOR
GROUND
1
2
3
4
SR00099
Figure 2. Block Diagram
1
1990 Sep 17
853-0391 00446
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
NE/SA612A
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
Maximum operating voltage
RATING
9
UNIT
V
V
CC
T
STG
Storage temperature
-65 to +150
°C
Operating ambient temperature range
T
A
NE
SA
0 to +70
-40 to +85
°C
AC/DC ELECTRICAL CHARACTERISTICS
T =25°C, V = 6V, Figure 3
A
CC
LIMITS
SYMBOL
PARAMETER
TEST CONDITION
UNIT
Min
Typ
Max
8.0
V
Power supply voltage range
DC current drain
4.5
V
CC
2.4
500
200
5.0
-13
17
3.0
mA
MHz
MHz
dB
f
f
Input signal frequency
Oscillator frequency
IN
OSC
Noise figured at 45MHz
Third-order intercept point at 45MHz
Conversion gain at 45MHz
RF input resistance
RF =-45dBm
dBm
dB
IN
14
R
C
1.5
kΩ
IN
IN
RF input capacitance
3
pF
Mixer output resistance
(Pin 4 or 5)
1.5
kΩ
radio 2nd IF and demodulator, the NE/SA612A is capable of
receiving -119dBm signals with a 12dB S/N ratio. Third-order
DESCRIPTION OF OPERATION
The NE/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.
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
NE/SA612A should be appropriately scaled.
The NE/SA612A is designed for optimum low power performance.
When used with the NE614A as a 45MHz cordless phone/cellular
2
1990 Sep 17
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
NE/SA612A
TEST CONFIGURATION
0.5 to 1.3µH
22pF
10pF
34.545MHz THIRD OVERTONE CRYSTAL
1nF
5.5µH
V
CC
100nF
6.8µF
10nF
8
7
6
5
150pF
OUTPUT
1.5 to
44.2µH
612A
330pF
120pF
1
2
3
4
47pF
0.209 to
0.283µH
INPUT
220pF
100nF
SR00101
Figure 3. Test Configuration
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
SR00102
Figure 4. Equivalent Circuit
3
1990 Sep 17
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
NE/SA612A
Besides excellent low power performance well into VHF, the
NE/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.
permissible oscillation frequency. If the required L.O. is beyond
oscillation limits, or the system calls for an external L.O., the
external signal can be injected at Pin 6 through a DC blocking
capacitor. External L.O. should be 200mV
maximum.
minimum to 300mV
P-P
P-P
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.
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.
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.
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.
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
612A
612A
612A
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
SR00103
Figure 5. Input Configuration
4
1990 Sep 17
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
NE/SA612A
C
*
12pF
T
5
5
CFU455
or Equivalent
612A
612A
Filter K&L 38780 or Equivalent
*C matches 3.5kΩ to next stage
T
4
4
a. Single-Ended Ceramic Filter
b. Single-Ended Crystal Filter
5
5
612A
612A
4
4
c. Single-Ended IFT
d.. Balanced Output
SR00104
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
612A
612A
612A
1
2
3
4
1
2
3
4
1
2
3
4
TC02101S
TC02111S
TC02121S
a. Colpitts Crystal Oscillator
(Overtone Mode)
c. Hartley L/C Tank Oscillator
b. Colpitts L/C Tank Oscillator
SR00105
Figure 7. Oscillator Circuits
5
1990 Sep 17
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
NE/SA612A
5.5µH
+6V
0.1µF
10µF
0.10pF
1
2
8
7
TO
BUFFER
612A
10pF
7pF
3
4
6
5
1000pF
DC CONTROL VOLTAGE
FROM SYNTHESIZER
1000pF
0.06µH
MV2105
OR EQUIVALENT
0.01µF
100k
2k
3SK126
2N918
0.01pF
2N5484
2pF
TO SYNTHESIZER
0.01µF
330
100k
TO SYNTHESIZER
100k
1.0nF
SR00106
Figure 8. Colpitts Oscillator Suitable for Synthesizer Applications and Typical Buffers
6
1990 Sep 17
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
NE/SA612A
TEST CONFIGURATION
0.5 to 1.3µH
22pF
5.6pF
44.545MHz THIRD OVERTONE CRYSTAL
5.5µH
1nF
V
CC
6.8µF
100nF
10nF
8
7
6
5
612A
1
2
3
4
455kHZ
SFG455A3
OR EQUIVALENT
47pF
0.209 to 0.283µH
INPUT
220pF
45MHz IN
100nF
SR00107
Figure 9. Typical Application for Cordless/Cellular Radio
7
1990 Sep 17
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
NE/SA612A
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
SR00111
SR00108
Figure 10. I vs Supply Voltage
Figure 13. Noise Figure
CC
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
–60
FUND. PRODUCT
16.0
15.5
15.0
14.5
14.0
–40 –30 –20 –10
0
10 20 30 40 50 60 70 80 90
O
TEMPERATURE
C
SR00109
–80
–60
–40
–20
0
20
Figure 11. Conversion Gain vs Supply Voltage
RF INPUT LEVEL (dBm)
SR00112
Figure 14. Third-Order Intercept and Compression
–10.0
–10.5
–11.0
–11.5
–10
–11
–12
–13
–14
–15
–12.0
–12.5
–13.0
–13.5
–14.0
–14.5
–15.0
–15.5
–16.0
–16.5
–17.0
–16
–17
–18
–40 –30 –20 –10
0
10 20 30 40 50 60 70 80 90
O
TEMPERATURE
C
SR00110
4
5
6
7
8
9
10
V
(VOLTS)
CC
Figure 12. Third-Order Intercept Point
SR00113
Figure 15. Input Third-Order Intermod Point vs V
CC
8
1990 Sep 17
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