NJM2594
DOUBLE BALANCED MODULATION / DEMODULATION
!
GENERAL DESCRIPTION
The
NJM2594
is a double balanced modulation/demodulation circuit,
applied to suppressed carrier modulation, amplitude modulation,
synchronous detection, FM or PM detection circuit.
Single input voltage and simplification of external circuit offers
wider applications.
!
PACKAGE OUTLINE
NJM2594M
!
FEATURES
"
Operating Voltage
"
Excellent Carrier Suppression
"
Simplification of External Circuit
"
Bipolar Technology
"
Package Outline
4.5 to 9V
NJM2594V
DMP8, SSOP8
!
BLOCK DIAGRAM
NC
8
CARRIER
SIGNAL
INPUT BYPASS INPUT
7
6
5
1
V+
2
3
4
GND
OUTPUT1 OUTPUT2
BLOCK DIAGRAM
-1-
NJM2594
!
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
V
+
P
D
Topr
Tstg
Id
RATINGS
14.0
250(SSOP-8), 300(DMP-8)
- 40 to +85
- 40 to +125
10
(Ta=25°C)
UNIT
V
mW
°C
°C
mA
Supply Voltage
Power Dissipation
Operating Temperature
Storage Temperature
Output 2 Drive Current
!
RECOMMENDED OPERATIONAL CONDITION
PARAMETER
Supply Voltage
SYMBOL
V
+
TEST CONDITIONS
MIN.
4.5
TYP.
5.0
(Ta=25°C)
MAX.
9.0
UNIT
V
!
ELECTRICAL CHARACTERISTICS
PARAMETER
Current Consumption
Conversion Gain
Signal Leakage Level
Carrier Leakage Level
Intermodulation
Signal Input Resistance
Signal Input Capacitance
Carrier Input Resistance
Carrier Input Capacitance
Output Resistance
Output Capacitance
note(3)
note(4)
note(5)
note(6)
(Ta=25°C,V
+
=5.0V)
TEST CONDITIONS
No Signal
note(1)
note(1)
note(1)
note (2)
SYMBOL
Icc
Gc
Ls
Lc
IMD
Rs
Cs
Rc
Cc
Ro
Co
MIN.
-
- 2.0
-
-
-
-
-
-
-
-
TYP.
11
0
-35
-40
- 60
600
3.8
1200
2.2
350
2.6
MAX.
14
+ 2.0
-20
-20
-
-
-
-
-
-
-
UNIT
mA
dB
dB
dB
dB
Ω
pF
Ω
pF
Ω
pF
note (7)
note (7)
OUTPUT1 terminal
OUTPUT1 terminal
note (7)
-
Notes :
(1) Input signal : Fs=1.75MHz, 70mVrms(-10dBm)
Carrier signal : Fc=28.25MHz,100mVrms(-7dBm)
Desired output signal : fundamental carrier upper-sideband output, Fd=30MHz
(2) Input signal 1 : Fs1=1.75MHz, 42.5mVrms(-14.42dBm)
Input signal 2 : Fs2=2.00MHz, 42.5mVrms(-14.42dBm)
Carrier signal : Fc=28.25MHz,100mVrms(-7dBm)
(3) The ratio of desired output signal level to input signal level
(4) The ratio of output signal at input signal frequency to desired output signal
(5) The ratio of output signal at carrier signal frequency to desired output signal
(6) The ratio of 29.75MHz Intermodulation signal to desired output signal
(7) Measured at 10MHz
-2-
NJM2594
!
MEASUREMENT CIRCUIT
"
Emitter - follower Output
Items for measurement : Conversion Gain, Signal Leakage Level, Carrier Leakage Level, Intermodulation
Measured at OUTPUT2 (pin 3)
Signal Input
Fs
0.01uF
5
50Ω
(1)
4
3
2
Open
1
0.022uF
0.01uF
510Ω
Spectrum
Analyzer
(Rin=50Ω)
6
7
Carrier Input
Fc
0.01uF
(1)
50Ω
0.01uF
8
V+
TEST CIRCUIT 1
"
Collector Output
Items for measurement : Current Consumption
Measured at OUTPUT1 (pin2)
Signal Input
Fs
0.01uF
50Ω
(1)
5
6
7
4
3
2
47Ω
1
0.022uF
A
Open
0.01uF 330Ω
4.3kΩ
Spectrum
Analyzer
(Rin=50Ω)
Carrier Input
Fc
0.01uF
(1)
50Ω
0.01uF
8
V+
TEST CIRCUIT 2
Notes :
(1)Impedance-matching resistor
-3-
NJM2594
!
TERMINAL FUNCTION
SYMBOL
EQUIVARENT CIRCUIT
VOLTAGE
(Ta=25°C,V
+
=5.0V)
FUNCTION
Power Supply.
Pin No.
1
1
V
+
5V
Collector Output.
2
OUTPUT1
V+
＋
2
3
4.0V
3
OUTPUT2
3.3V
Emitter Output.
Since there is no internal
resistor to the ground,
emitter current may be
obtained by connecting an
external resistor.
This terminal voltage is
obtained with a 510Ω
external resistor.
Ground.
4
GND
--
Signal Input Terminal.
5
SIGNAL
INPUT
V+
2.2V
6
BYPASS
2.2V
Common base lead of two
differential circuits.
This terminal should be
connected externally to AC
ground.
Carrier Input Terminal.
7
CARRIER
INPUT
5
6
7
2.2V
8
NC
--
No Connect.
The NC terminal is not
connected to internal circuit
so that this terminal can be
open or grounded.
-4-
NJM2594
!
APPLICATION CIRCUIT
"
Emitter - follower output
Signal Input
Fs
Cs
5
Cb
6
7
Ground or
Open
8
Rc=
350Ω
V+
4
0.01uF
3
Ii
RL
RL~
Emitter-
follower
Output
V -1.7
Ii
+
Carrier Input
Fc
Cc
2 Open
1
V+
0.022uF
APPLICATION CIRCUIT 1
"
Collector output
Cs
5
Cb
Carrier Input
Fc
Cc
7
Ground or
Open
8
V+
6
Rc=
350Ω
3
2
1
0.022uF
Open
0.01uF
Collector
Output
V+
4
Signal Input
Fs
APPLICATION CIRCUIT 2
"
"
"
The impedance of AC coupling capacitor connected to input / output terminals should be adequately low at the
frequency of input / output signals, respectably.
The impedance of base-coupling capacitor connected to BYPASS terminal should be adequately low against
the both of input/output signals to keep better performance on leakage and distortion characteristics.
In case of APPLICATION CIRCUIT 1, idle (emitter) current may be supplied by adding an external resistor
between OUTPUT2 (pin3) and ground.
The relation of idle current Ii and external resistance RL is determined by :
RL~
!
"
V -1.7
Ii
+
Note that there is some degradation in intermodulation characteristics with increasing the external resistance
RL, or decreasing a load impedance of Emitter-follower output.
The level of output signal comes constant at carrier input signal level over 100mV ( see Typical Characteristics).
-5-
