Electronic Components Datasheet Search |
|
MC33174DR2 Datasheet(PDF) 6 Page - ON Semiconductor |
|
MC33174DR2 Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 16 page MC33171, MC33172, MC33174, NCV33172 http://onsemi.com 6 APPLICATIONS INFORMATION − CIRCUIT DESCRIPTION/PERFORMANCE FEATURES Although the bandwidth, slew rate, and settling time of the MC33171/72/74 amplifier family is similar to low power op amp products utilizing JFET input devices, these amplifiers offer additional advantages as a result of the PNP transistor differential inputs and an all NPN transistor output stage. Because the input common mode voltage range of this input stage includes the VEE potential, single supply operation is feasible to as low as 3.0 V with the common mode input voltage at ground potential. The input stage also allows differential input voltages up to ±44 V, provided the maximum input voltage range is not exceeded. Specifically, the input voltages must range between VCC and VEE supply voltages as shown by the maximum rating table. In practice, although not recommended, the input voltages can exceed the VCC voltage by approximately 3.0 V and decrease below the VEE voltage by 0.3 V without causing product damage, although output phase reversal may occur. It is also possible to source up to 5.0 mA of current from VEE through either inputs’ clamping diode without damage or latching, but phase reversal may again occur. If at least one input is within the common mode input voltage range and the other input is within the maximum input voltage range, no phase reversal will occur. If both inputs exceed the upper common mode input voltage limit, the output will be forced to its lowest voltage state. Since the input capacitance associated with the small geometry input device is substantially lower (0.8 pF) than that of a typical JFET (3.0 pF), the frequency response for a given input source resistance is greatly enhanced. This becomes evident in D−to−A current to voltage conversion applications where the feedback resistance can form a pole with the input capacitance of the op amp. This input pole creates a 2nd Order system with the single pole op amp and is therefore detrimental to its settling time. In this context, lower input capacitance is desirable especially for higher values of feedback resistances (lower current DACs). This input pole can be compensated for by creating a feedback zero with a capacitance across the feedback resistance, if necessary, to reduce overshoot. For 10 k W of feedback resistance, the MC33171/72/74 family can typically settle to within 1/2 LSB of 8 bits in 4.2 ms, and within 1/2 LSB of 12 bits in 4.8 ms for a 10 V step. In a standard inverting unity gain fast settling configuration, the symmetrical slew rate is typically ±2.1 V/ ms. In the classic noninverting unity gain configuration the typical output positive slew rate is also 2.1 V/ ms, and the corresponding negative slew rate will usually exceed the positive slew rate as a function of the fall time of the input waveform. The all NPN output stage, shown in its basic form on the equivalent circuit schematic, offers unique advantages over the more conventional NPN/PNP transistor Class AB output stage. A 10 k W load resistance can typically swing within 0.8 V of the positive rail (VCC) and negative rail (VEE), providing a 28.4 Vpp swing from ±15 V supplies. This large output swing becomes most noticeable at lower supply voltages. The positive swing is limited by the saturation voltage of the current source transistor Q7, the VBE of the NPN pull−up transistor Q17, and the voltage drop associated with the short circuit resistance, R5. For sink currents less than 0.4 mA, the negative swing is limited by the saturation voltage of the pull−down transistor Q15, and the voltage drop across R4 and R5. For small valued sink currents, the above voltage drops are negligible, allowing the negative swing voltage to approach within millivolts of VEE. For sink currents (> 0.4 mA), diode D3 clamps the voltage across R4. Thus the negative swing is limited by the saturation voltage of Q15, plus the forward diode drop of D3 (≈VEE +1.0 V). Therefore an unprecedented peak−to−peak output voltage swing is possible for a given supply voltage as indicated by the output swing specifications. If the load resistance is referenced to VCC instead of ground for single supply applications, the maximum possible output swing can be achieved for a given supply voltage. For light load currents, the load resistance will pull the output to VCC during the positive swing and the output will pull the load resistance near ground during the negative swing. The load resistance value should be much less than that of the feedback resistance to maximize pull−up capability. Because the PNP output emitter−follower transistor has been eliminated, the MC33171/72/74 family offers a 15 mA minimum current sink capability, typically to an output voltage of (VEE +1.8 V). In single supply applications the output can directly source or sink base current from a common emitter NPN transistor for current switching applications. In addition, the all NPN transistor output stage is inherently faster than PNP types, contributing to the bipolar amplifier’s improved gain bandwidth product. The associated high frequency low output impedance (200 W typ @ 1.0 MHz) allows capacitive drive capability from 0 pF to 400 pF without oscillation in the noninverting unity gain configuration. The 60° phase margin and 15 dB gain margin, as well as the general gain and phase characteristics, are virtually independent of the source/sink output swing conditions. This allows easier system phase compensation, since output swing will not be a phase consideration. The AC characteristics of the MC33171/72/74 family also allow excellent active filter capability, especially for low voltage single supply applications. Although the single supply specification is defined at 5.0 V, these amplifiers are functional to at least 3.0 V @ 25°C. However slight changes in parametrics such as bandwidth, slew rate, and DC gain may occur. |
Similar Part No. - MC33174DR2 |
|
Similar Description - MC33174DR2 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |