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MC1496 데이터시트 PDF




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부품번호 MC1496 기능
기능 BALANCED MODULATORS/DEMODULATORS
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MC1496 데이터시트, 핀배열, 회로
MC1496, MC1496B
Balanced Modulators/
Demodulators
These devices were designed for use where the output voltage is a
product of an input voltage (signal) and a switching function (carrier).
Typical applications include suppressed carrier and amplitude
modulation, synchronous detection, FM detection, phase detection,
and chopper applications. See ON Semiconductor Application Note
AN531 for additional design information.
Features
Excellent Carrier Suppression 65 dB typ @ 0.5 MHz
50 dB typ @ 10 MHz
Adjustable Gain and Signal Handling
Balanced Inputs and Outputs
High Common Mode Rejection 85 dB Typical
This Device Contains 8 Active Transistors
PbFree Package is Available*
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14
1
SOIC14
D SUFFIX
CASE 751A
14
1
PDIP14
P SUFFIX
CASE 646
PIN CONNECTIONS
Signal Input 1
Gain Adjust 2
Gain Adjust 3
Signal Input 4
Bias 5
Output 6
N/C 7
14 VEE
13 N/C
12 Output
11 N/C
10 Carrier Input
9 N/C
8 Input Carrier
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 12 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
October, 2006 Rev. 10
1
Publication Order Number:
MC1496/D




MC1496 pdf, 반도체, 판매, 대치품
MC1496, MC1496B
GENERAL OPERATING INFORMATION
Carrier Feedthrough
Carrier feedthrough is defined as the output voltage at
carrier frequency with only the carrier applied
(signal voltage = 0).
Carrier null is achieved by balancing the currents in the
differential amplifier by means of a bias trim potentiometer
(R1 of Figure 5).
Carrier Suppression
Carrier suppression is defined as the ratio of each
sideband output to carrier output for the carrier and signal
voltage levels specified.
Carrier suppression is very dependent on carrier input
level, as shown in Figure 22. A low value of the carrier does
not fully switch the upper switching devices, and results in
lower signal gain, hence lower carrier suppression. A higher
than optimum carrier level results in unnecessary device and
circuit carrier feedthrough, which again degenerates the
suppression figure. The MC1496 has been characterized
with a 60 mVrms sinewave carrier input signal. This level
provides optimum carrier suppression at carrier frequencies
in the vicinity of 500 kHz, and is generally recommended for
balanced modulator applications.
Carrier feedthrough is independent of signal level, VS.
Thus carrier suppression can be maximized by operating
with large signal levels. However, a linear operating mode
must be maintained in the signalinput transistor pair or
harmonics of the modulating signal will be generated and
appear in the device output as spurious sidebands of the
suppressed carrier. This requirement places an upper limit
on inputsignal amplitude (see Figure 20). Note also that an
optimum carrier level is recommended in Figure 22 for good
carrier suppression and minimum spurious sideband
generation.
At higher frequencies circuit layout is very important in
order to minimize carrier feedthrough. Shielding may be
necessary in order to prevent capacitive coupling between
the carrier input leads and the output leads.
Signal Gain and Maximum Input Level
Signal gain (singleended) at low frequencies is defined
as the voltage gain,
AVS +
Vo
VS
+
RL
Re)2re
where
re +
26 mV
I5(mA)
A constant dc potential is applied to the carrier input
terminals to fully switch two of the upper transistors “on”
and two transistors “off” (VC = 0.5 Vdc). This in effect
forms a cascode differential amplifier.
Linear operation requires that the signal input be below a
critical value determined by RE and the bias current I5.
VS p I5 RE (Volts peak)
Note that in the test circuit of Figure 10, VS corresponds to
a maximum value of 1.0 V peak.
Common Mode Swing
The commonmode swing is the voltage which may be
applied to both bases of the signal differential amplifier,
without saturating the current sources or without saturating
the differential amplifier itself by swinging it into the upper
switching devices. This swing is variable depending on the
particular circuit and biasing conditions chosen.
Power Dissipation
Power dissipation, PD, within the integrated circuit
package should be calculated as the summation of the
voltagecurrent products at each port, i.e. assuming
V12 = V6, I5 = I6 = I12 and ignoring base current,
PD = 2 I5 (V6 V14) + I5)V5 V14 where subscripts refer
to pin numbers.
Design Equations
The following is a partial list of design equations needed
to operate the circuit with other supply voltages and input
conditions.
A. Operating Current
The internal bias currents are set by the conditions at Pin 5.
Assume:
I5 = I6 = I12,
then :
IBtt IC for all transistors
R5+ V
**f
I5
*500
W
where: R5 is the resistor between
where: Pin 5 and ground
where: f = 0.75 at TA = +25°C
The MC1496 has been characterized for the condition
I5 = 1.0 mA and is the generally recommended value.
B. CommonMode Quiescent Output Voltage
V6 = V12 = V+ I5 RL
Biasing
The MC1496 requires three dc bias voltage levels which
must be set externally. Guidelines for setting up these three
levels include maintaining at least 2.0 V collectorbase bias
on all transistors while not exceeding the voltages given in
the absolute maximum rating table;
30 Vdc w [(V6, V12) (V8, V10)] w 2 Vdc
30 Vdc w [(V8, V10) (V1, V4)] w 2.7 Vdc
30 Vdc w [(V1, V4) (V5)] w 2.7 Vdc
The foregoing conditions are based on the following
approximations:
V6 = V12, V8 = V10, V1 = V4
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MC1496 전자부품, 판매, 대치품
MC1496, MC1496B
TYPICAL CHARACTERISTICS (continued)
Typical characteristics were obtained with circuit shown in Figure 5, fC = 500 kHz (sine wave),
VC = 60 mVrms, fS = 1.0 kHz, VS = 300 mVrms, TA = 25°C, unless otherwise noted.
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.1
Signal Port
Side Band
Sideband Transadmittance
g21
+
Iout
(Each Sideband)
Vin (Signal)
Vout + 0
Signal Port Transadmittance
g21
+
Iout
Vin
Vout + 0 |VC| + 0.5 Vdc
1.0 10 100
fC, CARRIER FREQUENCY (MHz)
Figure 15. Sideband and Signal Port
Transadmittances versus Frequency
1000
0
10
20
30
MC1496
(70°C)
40
50
60
70
−75 −50 −25 0 25 50 75 100 125 150 175
TA, AMBIENT TEMPERATURE (°C)
Figure 16. Carrier Suppression
versus Temperature
20
RL = 3.9 k
Re = 500 W
10
RL = 3.9 k (Standard
0 Re = 1.0 k Test Circuit) RL = 3.9 k
Re = 2.0 k
−10
−20
−30
0.01
|VC| = 0.5 Vdc
RL = 500 W
Re = 1.0 k
AV
+
Re
RL
)
2re
0.1 1.0
f, FREQUENCY (MHz)
10
100
Figure 17. SignalPort Frequency Response
0
10
20
30
40
50
60
70
0.05
2fC
fC
3fC
0.1 0.5 1.0 5.0 10
fC, CARRIER FREQUENCY (MHz)
Figure 18. Carrier Suppression
versus Frequency
50
10
1.0
0.1
0.01
0.05 0.1
0.5 1.0
5.0 10
fC, CARRIER FREQUENCY (MHz)
Figure 19. Carrier Feedthrough
versus Frequency
50
0
10
20
30
40
fC ± 3fS
50
60 fC ± 2fS
70
80
0 200 400 600 800
VS, INPUT SIGNAL AMPLITUDE (mVrms)
Figure 20. Sideband Harmonic Suppression
versus Input Signal Level
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