NJM2594
-1 -
DOUBLE BALANCED MODULATION / DEMODULATION
!
!!
! GENERAL DESCRIPTION !
!!
! PACKAGE OUTLINE
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.
!
!!
! FEATURES
" Operating Voltage 4.5 to 9V
" Excellent Carrier Suppression
" Simplification of External Circuit
" Bipolar Technology
" Package Outline DMP8, SSOP8
!
!!
! BLOCK DIAGRAM
BLOCK DIA GRAM
NJM2594M
NJM2594V
8
12 43
567
V+
NC BYPASS
CARRIER
INPUT SIGNAL
INPUT
GND
OUTPUT1 OUTPUT2
NJM2594
- 2 -
!
ABSOLUTE MAXIMUM RATINGS
(Ta=25°C)
PARAMETER SYMBOL RATINGS UNIT
Supply Voltage V
+
14.0 V
Power Dissipation P
D
250(SSOP-8), 300(DMP-8) mW
Operating Temperature T o p r - 40 to +85 °C
Storage Temperature T s t g - 40 to +125 °C
Output 2 Drive Current I d 10 mA
!
RECOMMENDED OPERATIONAL CONDITION
(Ta=25°C)
PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
Supply Voltage V
+
4.5 5.0 9.0 V
!
ELECTRICAL CHARACTERISTICS
(Ta=25°C,V
+
=5.0V)
PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
Current Consumption I c c No Signal - 11 14 mA
Conversion Gain
note(3)
G c
note(1)
- 2.0 0 + 2.0 dB
Signal Leakage Level
note(4)
L s
note(1)
- -35 -20 dB
Carrier Leakage Level
note(5)
L c
note(1)
- -40 -20 dB
Intermodulation
note(6)
I M D
note (2)
- - 60 - dB
Signal Input Resistance R s
- 600 - Ω
Signal Input Capacitance C s
note (7)
- 3.8 - pF
Carrier Input Resistance R c
- 1200 - Ω
Carrier Input Capacitance C c
note (7)
- 2.2 - pF
Output Resistance R o OUTPUT1 terminal - 350 - Ω
Output Capacitance C o OUTPUT1 terminal
note (7)
- 2.6 - pF
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
NJM2594
-
3
-
!
MEA SUREMENT CIRCUIT
" Emitter - follower Output
Items for measurement : Conversion Gain, Signal Leakage Level, Carrier Leakage Level, Intermodulation
Measured at OUTPUT2 (pin 3)
TEST CIRCUIT 1
" Collect or Output
Items for measurement : Current Consumption
Measured at OUTPUT1 (pin2)
TEST CIRCUIT 2
Notes :
(1)Impedance-matching resistor
0.022uF
Signal Input
Fs
Carrier Input
Fc
0.01uF
50Ω
50ΩV+
0.01uF
4
3
2
1
5
6
7
8
(1)
(1)
Open
0.01uF
0.01uF 330Ω4.3kΩ
47Ω
A
Spectrum
Analyzer
(Rin=50Ω)
Signal Input
Fs
V+
Carrier Input
Fc
0.01uF
50Ω
50Ω
0.022uF
510Ω
0.01uF
4
3
2
1
5
6
7
8
(1)
(1)
Open
0.01uF
0.01uF
Spectrum
Analyzer
(Rin=50Ω)
NJM2594
- 4 -
! TERMI NAL FU NCTION
(Ta=25°C,V
+
=5.0V)
Pin No. SYMBOL EQUIVARENT CIRCUIT VOLTAGE FUNCTION
1 V
+
5V
Power Supply.
2 OUTPUT1 4.0V
Collector Output.
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.
4 GND --
Ground.
5 SIGNAL
INPUT 2.2V
Signal Input Terminal.
6
BYPASS 2.2V
Common base lead of two
differential circuits.
This terminal should be
connected externally to AC
ground.
7 CARRIER
INPUT
2.2V
Carrier Input Terminal.
8 NC
--
No Connect.
The NC terminal is not
connected to internal circuit
so that this terminal can be
open or grounded.
1
3
2
V
+
＋
5 6 7
V+
NJM2594
-
5
-
! APPLICATION CIRCUIT
" Emitter - follo wer output
APPLICATION CIRCUI T 1
" Collector output
APPLICATION CIRCUI T 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 :
! 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).
Signal Input
Fs
Carrier Input
Fc
Rc=
350Ω
0.022uF
V+
0.01uF
4
3
2
1
5
6
7
8
Open
Cs
V+
Cb
Cc
Ground or
Open
Collector
Output
Signal Input
Fs
Carrier Input
Fc
Rc=
350Ω
0.022uF
V+
Ii
4
3
2
1
5
6
7
8
Open
Cs V+
Cb
Cc
Ground or
Open
Emitter-
follower
Output
RL
0.01uF
RL~ V+-1.7
Ii
RL~ V
+
-1.7
Ii
NJM2594
-
6
-
!
HOW T O DECREASE LEA KA GE LEVEL
By adjusting DC bias of SIGNAL INPUT terminal, carrier leakage level may be decreased. By adjusting DC bias of
CARRIER INPUT terminal, signal leakage level may be decreased. In actual circuit, it can be seen the case that
either of these adjustment is provided, not both.
LEAKAGE ADJUSTMENT CIRCUIT
!
EVALUATION PC BOARD
The evaluation PC board shown in next page is useful for your design and is intended to have more understanding
of the usage and performance of this device. Two kinds of board are prepared for two packages, SSOP and DMP,
respectively. Each board can be applied to two kinds of circuit, emitter-follower output type and collector output type,
as shown below. This circuit is the same as MEASUREMENT CIRCUIT. For other electrical conditions, it should be
necessary to reconsider each value of components, especially of capacitance.
Note that this board is not prepared to show the recommendation of pattern and parts layout.
● Emitter - follower output
● Collector output
Singal Input
Fs
Carrier Input
Fc
V+
4
3
2
1
5
6
7
8
10kΩ
220kΩ 220kΩ
Variable Resistor for
Signal Leakage Level
Adjustment
10kΩ
Variable Resistor for
Carrier Leakage Level
Adjustment
(1)
(2)
(3)
(5)
(4)
(6)
(7)
(8)
Signal Input
Fs
V+
Carrier Input
Fc
0.01uF
50Ω
50Ω
0.022uF
RL
0.01uF
4
3
2
1
5
6
7
8
Open
0.01uF
0.01uF
Output
(1)
(2)
(3)
(5)
(4)
(6)
(9)
(11)
(10) (12)
0.022uF
Signal Input
Fs
Carrier Input
Fc
0.01uF
50Ω
50ΩV+
0.01uF
4
3
2
1
5
6
7
8
Open
0.01uF
0.01uF 330Ω4.3kΩ
47Ω
A
Output
(50Ω)
NJM2594
-7 -
Evaluation PC Board
Component Placement View
● Emitter - follower output
● Collector output
1
3
CARRIER INPUT
（裏面）
50Ω
50Ω
0.01uF
0.01uF
0.01uF
NJM2594
SIGNAL INPUT
（裏面）
2
4
5
VCC（裏面）GND
6
7
8
0.01uF
RL
OUTPUT2
（裏面）
0.022uF
1
3
CARRIER INPUT
（裏面）
50Ω
50Ω
0.01uF
0.01uF
0.01uF
NJM2594
SIGNAL INPUT
（裏面）
2
4
5
VCC（裏面）GND
6
11
9
0.01uF 4.3Ω
0.022uF
OUTPUT1
（裏面）
10
12
330Ω
47Ω
NJM2594
-
8
-
! TYPICA L CHA RA CTERISTICS
( Ta=25°C,V
+
=5.0V, unless otherwise noted )
Conversion Gain versus Supply Voltage
-3
-2
-1
0
1
2
3
4 5 6 7 8 9 10 11 12 13 14
Supply Voltage V+ (V)
Conversion Gain Gc (dB)
(TEST CIRCUIT2, Fs=1.75MHz/-10dBm, Fc=28.25MHz/-7dBm)
Operatin g Current v ersus Su p p ly Voltage
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Supply Voltage V+ (V)
Operating Current Icc (mA)
(TEST CIRCUIT2, No input signal)
2pin Out p ut Volt age versus Supply Volt a g e
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
01234567891011121314
Supply Voltage V+ (V)
2pin Output Voltage (V)
(TEST CIRCUIT2, No input signal)
5/6/7 pin Outpu t Voltag e versus Supply Voltage
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Supply Voltage V+ (V)
5/6/7 pin Output Voltage
(TEST CIRCUIT2, No input signal)
3pin Output Voltage versus Supply Voltage
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
01234567891011121314
Supply Voltage V+ (V)
3pin Output Voltage (V)
(TEST CIRCUIT2, No input signal)
Sign al Leakage Level versus Supply Voltage
-60
-55
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
4 5 6 7 8 9 10 11 12 13 14
Supply Voltage V+ (V)
Signal Leakage Level Ls (dB)
(TEST CIRCUIT1, Fs=1.75MHz/-10dBm, Fc=28.25MHz/-7dBm)
Carrier Leakage Level versus Su p p ly Voltage
-60
-55
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
4 5 6 7 8 9 10 11 12 13 14
Supply Voltage V+ (V)
Carrier Leakage Level Lc (dB)
(TEST CIRCUIT1, Fs=1.75MHz/-10dBm, Fc=28.25MHz/-7dBm)
Intermodulation versus Supply Voltage
-60
-55
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
4 5 6 7 8 9 10 11 12 13 14
Supply Voltage V+ (V)
Intermodulation IMD (dB
)
(TEST CIRCUIT1, Fs1=1.75MHz/-14.42dBm,Fs2=2MHz/-
14.42dBm, Fc=28.25MHz/-7dBm)
NJM2594
-
9
-
! TYPICA L CHA RA CTERISTICS
( Ta=25°C,V
+
=5.0V, unless otherwise noted )
Note :
(1) OUTPUT2 level (dB):
the ratio of OUTPUT2 Level to input signal level.
OUTPUT2 Level versus In put Signal Level
-70
-60
-50
-40
-30
-20
-10
0
10
-30 -25 -20 -15 -10 -5 0 5 10
Input Signal Level L-Fs (dBm)
OUTPUT2 Level (dBm)
(TEST CIRCUIT1, Fs=1.75MHz, Fc=28.25MHz/-7dBm)
Fs+Fc
Fs
Fc
OUTPUT2 Level versus Carrier Signal Level
-80
-70
-60
-50
-40
-30
-20
-10
0
-30 -25 -20 -15 -10 -5 0 5 10
Carrier Signal Level L-Fc (dBm)
OUTPUT2 Level (dBm)
(TEST CIRCUIT1, Fs=1.75MHz/-10dBm, Fc=28.25MHz)
Fs+Fc
Fs
Fc
OUTPUT2 Level versus In put Signal Level
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-20 -15 -10 -5 0 5 10
Input Signal Level L-Fs (dBm)
OUTPUT2 Level (dBm)
(TEST CIRCUIT1, Fs1=1.75MHz, Fs2=2MHz Fc=28.25MHz/-7dBm)
Fs1+Fc
IMD
OUTPUT2 Level
note(1)
versus Carrier Freque ncy
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
1 10 100 1000
Carrier Signal Frequency Fc (MHz)
OUTPUT2 Level (dB)
(TEST CIRCUIT1, Fs=1.75MHz/-10dBm, Fc=1 to 1000MHz/-7dBm)
Fs
Fc
Fc+Fs
OUTPUT2 Level
note(1)
versus Carrier Freque ncy
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
1 10 100 1000
Carrier Signal Frequency Fc (MHz)
OUTPUT2 Level (dB)
(TEST CIRCUIT1, Fs=1.75MHz/-10dBm, Fc=1 to 1000MHz/-15/-7/0dBm)
Fs=0dBm
Fs=-15dBm
Fs=-7dBm
OUTPUT2 Level
note(1)
versus Input Signal Frequency
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
1 10 100 1000
Input Signal Frequency Fs (MHz)
OUTPUT2 Level (dB)
Fs+Fc
Fs
Fc
(TEST CIRCUIT1, Fs=1 to 1000MHz/-10dBm, Fc=28.25/-7dBm)
NJM2594
- 1
0
-
!
TYPICA L CHA RACTERIST ICS
( Ta=25°C,V
+
=5.0V, unless otherwise noted )
2 pin Output Voltag e versus Ambient Tempe rature
3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
4.3
4.4
4.5
-50 -25 0 25 50 75 100 125
Ambient Temperature (°C)
2pin Output Voltage (V)
(TEST CIRCUIT2, No input signal)
3 pin Output Voltag e versus Ambient Tempe rature
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
-50 -25 0 25 50 75 100 125
Ambient Temperature (°C)
3pin Output Voltage (V)
(TEST CIRCUIT2, No input signal)
Operating Current versus Ambient Temperature
8.0
8.5
9.0
9.5
10.0
10.5
11.0
11.5
12.0
12.5
13.0
13.5
14.0
-50 -25 0 25 50 75 100 125
Ambient Temperature (°C)
Operating Current Icc (mA)
(TEST CIRCUIT2, No input signal)
5/6/7 pin Output Voltage versus Ambient Temperature
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
-50 -25 0 25 50 75 100 125
Ambient Temperatue (°C)
5/6/7 pin Output Voltage (V)
(TEST CIRCUIT2, No input signal)
C onve rsion Gain versus Am bient Temperature
-3
-2
-1
0
1
2
3
-50 -25 0 25 50 75 100 125
Ambient Temperature Ta(°C)
Conversion Gain Gc (dB)
(TEST CIRCUIT2, Fs=1.75MHz/-10dBm, Fc=28.25MHz/-7dBm)
Signal Leakage Level versus Ambient Temperature
-60
-55
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
-50 -25 0 25 50 75 100 125
Ambient Temperature (°C)
Signal Leakage Level Ls (dB)
(TEST CIRCUIT1, Fs=1.75MHz/-10dBm, Fc=28.25MHz/-7dBm)
Carrier Lea kage Level versus Ambient Temperature
-60
-55
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
-50 -25 0 25 50 75 100 125
Ambient Temperature (°C)
Carrier Leakage Level Lc (dB)
(TEST CIRCUIT1, Fs=1.75MHz/-10dBm, Fc=28.25MHz/-7dBm)
Intermodulation versus Ambient Temperature
-60
-55
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
-50 -25 0 25 50 75 100 125
Ambient Temperature (°C)
Intermodulation IMD (dB
)
(TEST CIRCUIT1, Fs1=1.75MHz/-14.42dBm,Fs2=2MHz/-14.42dBm,
Fc=28.25MHz/-7dBm)
NJM2594
- 11 -
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
