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AD8531AR 데이터시트(PDF) 8 Page - Analog Devices |
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AD8531AR 데이터시트(HTML) 8 Page - Analog Devices |
8 / 16 page AD8531/AD8532/AD8534 REV. D –8– 100 90 10 0% VS = 2.5V AV = 1 RL = 2k TA = 25 C 500mV 500ns Figure 29. Large Signal Transient Response APPLICATIONS THEORY OF OPERATION The AD8531/AD8532/AD8534 is an all-CMOS, high output current drive, rail-to-rail input/output operational amplifier. This is the latest entry in Analog Devices’ expanding family of single-supply devices for the multimedia and telecom market- places. Its high output current drive and stability with heavy capacitive loads makes the AD8531/AD8532/AD8534 an excel- lent choice as a drive amplifier for LCD panels. Figure 32 illustrates a simplified equivalent circuit for the AD8531/ AD8532/AD8534. Like many rail-to-rail input amplifier configu- rations, it is comprised of two differential pairs, one n-channel (M1–M2) and one p-channel (M3–M4). These differential pairs are biased by 50 mA current sources, each with a compliance limit of approximately 0.5 V from either supply voltage rail. The differential input voltage is then converted into a pair of differ- ential output currents. These differential output currents are then combined in a compound folded-cascade second gain stage (M5–M9). The outputs of the second gain stage at M8 and M9 provide the gate voltage drive to the rail-to-rail output stage. Additional signal current recombination for the output stage is achieved through the use of transistors M11–M14. In order to achieve rail-to-rail output swings, the AD8531/ AD8532/AD8534 design employs a complementary common- source output stage (M15–M16). However, the output voltage swing is directly dependent on the load current, as the difference between the output voltage and the supply is determined by the AD8531/AD8532/AD8534’s output transistors on-channel resistance (see Figures 8 and 9). The output stage also exhibits voltage gain by virtue of the use of common-source amplifiers; as a result, the voltage gain of the output stage (thus, the open- loop gain of the device) exhibits a strong dependence to the total load resistance at the output of the AD8531/AD8532/AD8534. 50 A 100 A 100 A 20 A VB2 M5 M8 M12 M15 M16 M11 OUT M3 M4 M2 M1 IN– IN+ VB3 M6 M7 M10 20 A M13 50 A V+ V– M9 M14 Figure 32. AD8531/AD8532/AD8534 Simplified Equivalent Circuit Short-Circuit Protection As a result of the design of the output stage for maximum load current capability, the AD8531/AD8532/AD8534 does not have any internal short-circuit protection circuitry. Direct connection of the AD8531/AD8532/AD8534’s output to the positive supply in single-supply applications will destroy the device. In those applications where some protection is needed, but not at the expense of reduced output voltage headroom, a low value resis- tor in series with the output, as shown in Figure 33, can be used. The resistor, connected within the feedback loop of the amplifier, will have very little effect on the performance of the amplifier other than limiting the maximum available output volt- age swing. For single 5 V supply applications, resistors less than 20 W are not recommended. 5V RX 20 VOUT VIN AD8532 Figure 33. Output Short-Circuit Protection VS = 1.35V AV = 1 RL = 2k TA = 25 C 500ns 500mV 100 90 10 0% Figure 30. Large Signal Transient Response 1V 10 s 1V 0% 10 90 100 Figure 31. No Phase Reversal |
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