Document
NJM2594
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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
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NJM2594
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!
ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL V+ PD 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
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RECOMMENDED OPERATIONAL CONDITION
PARAMETER Supply Voltage SYMBOL V+ TEST CONDITIONS MIN. 4.5 TYP. 5.0
(Ta=25°C) MAX. 9.0 UNIT V
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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)
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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
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NJM2594
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!
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
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NJM2594
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!
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.
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NJM2594
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!
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~
Emitterfollower 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 extern.