PDF ICL8013 Data sheet ( Hoja de datos )

Número de pieza	ICL8013
Descripción	1MHz Four Quadrant Analog Multiplier
Fabricantes	INTERSIL
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No Preview Available ! Data Sheet ICL8013 April 1999 File Number 2863.4 1MHz, Four Quadrant Analog Multiplier The ICL8013 is a four quadrant analog multiplier whose output is proportional to the algebraic product of two input signals. Feedback around an internal op amp provides level shifting and can be used to generate division and square root functions. A simple arrangement of potentiometers may be used to trim gain accuracy, offset voltage and feedthrough performance. The high accuracy, wide bandwidth, and increased versatility of the ICL8013 make it ideal for all multiplier applications in control and instrumentation systems. Applications include RMS measuring equipment, frequency doublers, balanced modulators and demodulators, function generators, and voltage controlled ampliﬁers. Ordering Information PART NUMBER ICL8013BCTX ICL8013CCTX MULTIPLI- CATION ERROR (MAX) TEMP. RANGE (oC) PKG PKG. NO. ±1% 0 to 70 10 Pin T10.B Metal Can ±2% 0 to 70 10 Pin T10.B Metal Can Features • Accuracy. . . . . . . . . . . . . . . . . . . . . . . . ±1% (“B” Version) • Input Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . ±10V • Bandwidth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1MHz • Uses Standard ±15V Supplies • Built-In Op Amp Provides Level Shifting, Division and Square Root Functions Pinout ICL8013 (METAL CAN) TOP VIEW YIN 1 YOS 10 9 ZOS V+ 2 8 GND ZIN 3 7 XOS OUTPUT 4 5 6 XIN V- Functional Diagram ZIN XIN XOS VOLTAGE TO CURRENT CONVERTER AND SIGNAL COMPRESSION YIN YOS BALANCED VARIABLE GAIN AMPLIFIER ZOS VOLTAGE TO CURRENT CONVERTER ZIN OP AMP OUT 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 \| Copyright © Intersil Corporation 1999 1 page ICL8013 RL IE 1/2 IE + ∆ + VIN - 1/2 IE - ∆ Q1 Q2 IE V+ ∆VOUT = 0 IE RL 1/2 IE - ∆ 1/2 IE + ∆ Q3 Q4 IE V- FIGURE 4A. INPUT SIGNAL WITH BALANCED CURRENT SOURCES ∆VOUT = 0V V+ RL IE 1/2 IE + Q1 Q2 VIN = 0 - 2IE ∆VOUT = 0 RL IE 1/2 IE Q3 Q4 IE V- FIGURE 4B. NO INPUT SIGNAL WITH UNBALANCED CURRENT SOURCES ∆VOUT = 0V RL 3/2I + ∆ IE + 2∆ + 1/2 IE - ∆ Q1 Q2 V-IN 2IE V+ ∆VOUT = 0 3/2I - ∆ RL 1/2 IE - 2∆ 1/2 IE + ∆ Q3 Q4 IE V- FIGURE 4C. INPUT SIGNAL WITH UNBALANCED CURRENT SOURCES, DIFFERENTIAL OUTPUT VOLTAGE This circuit of Figure 5 still has the problem that the input voltage VIN must be small to keep the differential ampliﬁer in the linear region. To be able to handle large signals, we need an amplitude compression circuit. V+ RL ∆V = K • (VX • VY) R + Q1 Q2 VIN - VIN IE Q3 Q4 RE IE V- FIGURE 5. TYPICAL FOUR QUADRANT MULTIPLIER- MODULATOR Figure 2 showed a current source formed by relying on the matching characteristics of a diode and the emitter base junction of a transistor. Extension of this idea to a differential circuit is shown in Figure 6A. In a differential pair, the input voltage splits the biasing current in a logarithmic ratio. (The usual assumption of linearity is useful only for small signals.) Since the input to the differential pair in Figure 6A is the difference in voltage across the two diodes, which in turn is proportional to the log of the ratio of drive currents, it follows that the ratio of diode currents and the ratio of collector currents are linearly related and independent of amplitude. If we combine this circuit with the voltage to current converter of Figure 3, we have Figure 6B. The output of the differential ampliﬁer is now proportional to the input voltage over a large dynamic range, thereby improving linearity while minimizing drift and noise factors. The complete schematic is shown after the Electrical Speciﬁcations Table. The differential pair Q3 and Q4 form a voltage to current converter whose output is compressed in collector diodes Q1 and Q2. These diodes drive the balanced cross-coupled differential ampliﬁer Q7/Q8 Q14/Q15. The gain of these ampliﬁers is modulated by the voltage to current converter Q9 and Q10. Transistors Q5, Q6, Q11, and Q12 are constant current sources which bias the voltage to current converter. The output ampliﬁer comprises transistors Q16 through Q27. X x ID X x IE (I - X) IE (I - X) ID 2 IE FIGURE 6A. CURRENT GAIN CELL 5 5 Page

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