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TS9002IM8T Datasheet(PDF) 8 Page - Silicon Laboratories |
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TS9002IM8T Datasheet(HTML) 8 Page - Silicon Laboratories |
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8 / 12 page  TS9002 Page 8 TS9002 Rev. 1.0 than 3µA. If the power dissipation of the package is maintained within the max limit, the output can source pulses of 100mA of current with V+ set to +5V. In an effort to minimize external components needed to address power supply feedback, the TS9002 output does not produce crowbar switching current as the output switches. At a power supply voltage of 3V, the propagation delay of the TS9002 is 6 μs when the output switches from high-to-low and low-to-high. Voltage Reference The TS9002 has an on-board +1.182V voltage reference with an accuracy of ±0.75%. The REF pin is able to source and sink 20 μA and 10μA of current, respectively. The REF pin is referenced to V- and it should not be bypassed. Noise Considerations Noise can play a role in the overall performance of the TS9002. Despite having a large gain, if the input voltage is near or equal to the input offset voltage, the output will randomly switch HIGH and LOW. As a result, the TS9002 produces a peak-to-peak noise of about 0.3mVPP while the reference voltage produces a peak-to-peak noise of about 1mvPP. Furthermore, it is important to design a layout that minimizes capacitive coupling from a given output to the reference pin as crosstalk can add noise and as a result, degrade performance. APPLICATIONS INFORMATION 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. Hysteresis can be generated with two external resistors using positive feedback as shown in Figure 2. Resistor R1 is connected between REF and HYST and R2 is connected between HYST and V-. This will increase the trip point for the rising input voltage, VTHR, and decrease the trip point for the falling input voltage, VTHF, by the same amount. If no hysteresis is required, connect HYST to REF. The hysteresis band, VHB, is voltage across the REF and HYST pin multiplied by a factor of 2. The HYST pin can accept a voltage between REF and REF-50mV, where a voltage of REF-50mV generates the maximum voltage across R1 and thus, the maximum hysteresis and hysteresis band of 50mV and 100mV, respectively. To design the circuit for a desired hysteresis band, consider the equations below to acquire the values for resistors R1 and R2: Figure 1. Threshold Hysteresis Band Figure 2. Programming the HYST Pin |
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