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TS12012 データシート(PDF) 7 Page - Touchstone Semiconductor Inc |
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TS12012 データシート(HTML) 7 Page - Touchstone Semiconductor Inc |
7 / 11 page TS12011/TS12012 TS12011_12DS r1p0 Page 7 RTFDS input offset current are less than 20nA and 2nA, respectively. Comparator The TS12011 and TS12012 analog comparator input stage is robust as it can tolerate input voltages 300mV beyond the power supply rails. To insure clean output switching behavior, the analog comparator features ±7.5mV internal hysteresis. The TS12011 push-pull output driver was designed to minimize supply-current surges while driving ±100µA loads with an output swing to within 100mV of the supply rails. The open drain output stage TS12012 can be connected to supply voltages above VDD to an absolute maximum of 5.5V above VSS. Where wired- OR logic connections are needed, the open-drain output stage makes it easy to use this analog comparator. The TS12011 and the TS12012 can sink 0.5mA and 1.4mA of current, respectively. The TS12011 can source 0.1mA of current. Reference The TS12011 and TS12012 on-board 0.58V ±4.5% reference voltage can source and sink 0.1µA and 0.1µA of current and can drive a capacitive load less than 50pF and greater than 50nF with a maximum capacitive load of 250nF. The higher the capacitive load, the lower the noise on the reference voltage and the longer the time needed for the reference voltage to respond and become available on the REFOUT pin. With a 250nF capacitive load, the reference voltage will settle to within specifications in approximately 20ms. Op-Amp Stability The TS12011 and TS12012 op-amp is able to drive up to 50pF of capacitive load and still maintain stability in a unity-gain configuration with a 15kHz GBWP and a phase margin of 70 degrees with a 100kΩ//20pF output load. Though the TS12011 and TS12012 address low frequency applications, it is essential to perform good layout techniques in order to minimize board leakage and stray capacitance, which is of a concern in low power, high impedance circuits. For instance, a 10MΩ resistor coupled with a 1pF stray capacitance can lead to a pole at approximately 15kHz, which is the GBWP of the device. If stray capacitance is unavoidable, a feedback capacitor can be placed in parallel with the feedback resistor. APPLICATIONS INFORMATION Comparator Hysteresis As a result of circuit noise or unintended parasitic feedback, many analog comparators often break into oscillation within their linear region of operation especially when the applied differential input voltage approaches 0V (zero volt). Externally-introduced hysteresis is a well-established technique to stabilizing analog comparator behavior and requires external components. As shown in Figure 1, adding comparator hysteresis creates two trip points: VTHR (for the rising input voltage) and VTHF (for the falling input voltage). The hysteresis band (VHB) is defined as the voltage difference between the two trip points. When a comparator’s input voltages are equal, hysteresis effectively forces one comparator input to move quickly past the other input, moving the input out of the region where oscillation occurs. Figure 1 illustrates the case in which an IN- input is a fixed voltage and an IN+ is varied. If the input signals were reversed, the figure would be the same with an inverted output. To save cost and external pcb area, an internal ±7.5mV hysteresis circuit was added to the TS12011 and TS12012. Adding Hysteresis to the TS12011 Push-pull Output Option Additional hysteresis can be generated with three external resistors using positive feedback as shown in Figure 2. Unfortunately, this method also reduces the hysteresis response time. The procedure to calculate the resistor values for the TS12011 is as follows: Figure 1. TS12011/TS12012 Threshold Hyesteresis Band |
同様の部品番号 - TS12012 |
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同様の説明 - TS12012 |
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