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 analog 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 differential 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 applications include suppressed carrier and amplitude modulation, synchronous AM detection, FM detection, phase detection, and frequency doubling, at frequencies up to UHF. 14 1 CERDIP 14 = C CERAMIC PACKAGE CASE 632 CROSS REFERENCE/ORDERING INFORMATION PACKAGE MOTOROLA LANSDALE CERDIP 14 12502/BCA ML12502/BCA There are two package offerings: • Dual Inline 14 Lead, Ceramic Package. PIN CONNECTIONS • Operating Temperature Range: TA = –55° to +125°C Figure 1. Logic Diagram Local Oscillator Inputs 2 12 VB VR 8 Signal Inputs Carrier Port Amplifier 3 11 Output Mixer Signal Port VR VB 9 1 14 VCC Local Oscillator Input 2 13 Resistor Load Local Oscillator Input 3 12 Data Output Alternate Signal Input 4 11 Data Output Null Adjust 5 10 Regulator Bypass Null Adjust 6 9 Mixer Signal Input VEE 7 8 Mixer Signal Input (Top View) Bias Regulator Page 1 of 8 Regulator Bypass www.lansdale.com Issue 0 LANSDALE Semiconductor, Inc. ELECTRICAL CHARACTERISTICS ML12502 Page 2 of 8 www.lansdale.com Issue 0 LANSDALE Semiconductor, Inc. ELECTRICAL CHARACTERISTICS ML12502 Page 3 of 8 www.lansdale.com Issue 0 ML12502 Page 4 of 8 LANSDALE Semiconductor, Inc. www.lansdale.com Issue 0 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 12 Local Oscillator Inputs 3 Outputs 11 1.0 µf Hewlett Packard 651A and 3300B 100 kHz to 100 MHz @ 30 mVpp Sampling Volt meter Hewlett Packard 3406A or Equiv. Mixer Inputs 8 1.0 µf Reg. Bypass 9 1 10 0.1 µf 0.1 µf Null Adjust VEE 7 5 6 133 133 VCC 14 50 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. Page 5 of 8 www.lansdale.com All Input and output cables to the scope are equal lengths of 50-ohm coaxial cable. Issue 0 ML12502 LANSDALE Semiconductor, Inc. Figure 6. Carrier Feedthrough versus Frequency (Test 2) V CFT, CARRIER OUTPUT VOLTAGE (mV [rms]) V CFT, CARRIER OUTPUT VOLTAGE (mV[rms]) Figure 5. Carrier Feedthrough versus Frequency (Test 1) 5.0 4.0 3.0 2.0 1.0 0.0 0.1 1.0 10.0 100.0 5.0 4.0 3.0 2.0 1.0 0.0 0.1 1.0 fc, CARRIER FREQUENCY (MHz) 10.0 100.0 fc, CARRIER FREQUENCY (MHz) Figure 7. Carrier Suppression Test Circuit Hewlett Packard 3406A Sampling Voltmeter 0.1 µf Hewlett Packard TEE 11536A 1.0 µf 50 2 3 9 0.1 µf Outputs 11 50 8 Hewlett Packard 651A and 3300B 100 kHz to 400 MHz @ 30 mV RMS. Hewlett Packard 651A 10 kHz @ 150 mV R.M.S. 50 12 Local Oscillator Inputs 50 Reg. Bypass Mixer Inputs Null Adjust VEE 1.0µf 1 1.0 µf 10 7 5 6 X 50 Atten. 50 VCC 14 All input and output cables to the scope are equal lengths of 50-ohm coaxial cable. 1.0 µf 50 – 5.0 V – + – 5.0 V Notes: Test 1 – Adjust potentiometer for carrier null @ fc = 100 kHz Test 2 – Connect pins 5 and 6 to –5.0 volts Test 3 – Adjust potentiometer for carrier null @ 25° C Figure 9. Carrier Suppression versus Frequency (Test 2) +40 +40 +30 +30 CARRIER SUPPRESSION (dB) CARRIER SUPPRESSION (dB) Figure 8. Carrier Suppression versus Frequency (Test 1) +20 +10 0 –10 –20 –30 –40 +10 0 –10 –20 –30 –40 –50 –50 –60 0.1 +20 1.0 10.0 100.0 1.0 K –60 0.1 Page 6 of 8 1.0 10.0 100.0 1.0 K fc, CARRIER FREQUENCY (MHz) fc, CARRIER FREQUENCY (MHz) www.lansdale.com Issue 0 ML12502 LANSDALE Semiconductor, Inc. Figure 10. Carrier Suppression versus Temperature CARRIER SUPPRESSION (dB) –10 –20 –30 fc = 10 MHz @ 30 mvrms fs = 10 KHz @ 150 mvrms –40 –50 –60 –55 –25 0 +25 +50 +75 +100 +125 TA, AMBIENT TEMPERATURE (°C) Figure 11. Output Offset Current (I00) versus Temperature 1.0 µf 1.0 µf 2 12 µA Local Oscillator Inputs 3 I12 I Outputs 1.0 µf 1.0 µf 8 11 Mixer Inputs Reg. Bypass 9 1 10 0.1µf I11 I µA Null Adjust VEE 7 0.1 µf 5 VCC 6 14 IOO = I11 – I12 0.1 µf –5.0 V Notes: Test 1 – Pins 5 and 6 left open Test 2 – Pins 5 and 6 are tied to –5.0 volts Figure 12. Output Offset Current versus Temperature Figure 13. Typical Input Impedance versus Frequency (No Circuit) 31 +100 R L RESISTANCE (Ohms) +50 350 TEST 1 0.0 –50 TEST 2 300 250 26 R 16 Zin 21 C 200 11 6 150 100 –25 0 +25 +50 +75 +100 +125 TA, AMBIENT TEMPERATURE (°C) Page 7 of 8 TYPICAL INPUT IMPEDANCE vs FREQUENCY R C – LOCAL OSCILLATOR – AND SIGNAL INPUTS 1 50 –100 –55 R(OHMS) C, CAPACITANCE (pF) I OO, OUTPUT OFFSET CURRENT ( µ A) 400 200 400 600 800 1000 f, FREQUENCY (MHZ) www.lansdale.com Issue 0 ML12502 LANSDALE Semiconductor, Inc. OUTLINE DIMENSIONS CERDIP 14 = C (ML12502/BCA) CASE 632 Lansdale Semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. Lansdale does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. “Typical” parameters which may be provided in Lansdale data sheets and/or specifications can vary in different applications, and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by the customer’s technical experts. Lansdale Semiconductor is a registered trademark of Lansdale Semiconductor, Inc. Page 8 of 8 www.lansdale.com Issue 0