ML12502
Analog Mixer With On–Chip
Regulator For Bias Control
Legacy Device:
Motorola 12502
The ML12502 is the military temperature version of the
commercial ML12002 device. It is a double balanced ana-
log mixer, including an input amplifier feeding the mixer
carrier port and a temperature compensated bias regulator.
The input circuits for both the amplifier and mixer are dif-
ferential amplifier circuits. The on-chip regulator provides
all of the required biasing.
This circuit is designed for use as a balanced mixer in
high-frequency wide-band circuits. Other typical applica-
tions include suppressed carrier and amplitude modulation,
synchronous AM detection, FM detection, phase detection,
and frequency doubling, at frequencies up to UHF.
There are two package offerings:
• Dual Inline 14 Lead, Ceramic Package.
• Operating Temperature Range: TA = –55° to +125°C
Regulator
Bypass
Local Oscillator
Input
Local Oscillator
Input
Output
Alternate Signal
Input
Null Adjust
1
14
VCC
14
1
CERDIP 14 = C
CERAMIC PACKAGE
CASE 632
CROSS REFERENCE/ORDERING INFORMATION
PACKAGE
MOTOROLA
LANSDALE
CERDIP 14
12502/BCA
ML12502/BCA
PIN CONNECTIONS
2
13
Resistor Load
Figure 1. Logic Diagram
2
3
VB
8
Signal
Inputs
9
Amplifier
VR
Carrier
Port
Mixer
Signal
Port
VR VB
12
11
3
12
Data Output
Local
Oscillator
Inputs
4
11
Data Output
5
10
Regulator
Bypass
Mixer Signal
Input
Mixer Signal
Input
Null Adjust
6
9
VEE
Bias
Regulator
7
(Top View)
8
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ML12502
LANSDALE Semiconductor, Inc.
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ELECTRICAL CHARACTERISTICS
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ML12502
LANSDALE Semiconductor, Inc.
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ELECTRICAL CHARACTERISTICS
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ML12502
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ML12502
LANSDALE Semiconductor, Inc.
Figure 4. Carrier Feedthrough Test Circuits
Signal A
Input (Pin 2)
Output (Pin12)
Output (Pin 11)
Signal B Input (Pin 8)
Output (Pin 12)
Output (Pin 11)
Tektronix
454 and 568
Oscilloscopes
1.0
µf
2
3
Local Oscillator
Inputs
Mixer
Inputs
Reg.
Bypass
1
0.1
µf
0.1
µf
10
Null
Adjust
5
50
6
Outputs
12
Sampling Volt meter
Hewlett Packard
3406A or Equiv.
1.0
µf
Hewlett Packard
651A and 3300B
100 kHz to 100 MHz
@ 30 mVpp
8
1.0
µf
9
11
133
VCC
14
133
VEE
7
0.1
µf
+5.0 V
Notes:
Test 1 – Adjust potentiometer for carrier null at fc = 100 kHz.
Test 2 – Connect pins 5 and 6 to Gnd.
All Input and output
cables to the scope are
equal lengths of 50-ohm
coaxial cable.
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