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LTC1040CJ Datasheet(PDF) 7 Page - Linear Technology |
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LTC1040CJ Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LTC1040 1040fa 1A 100mV APPLICATIO S I FOR ATIO Offset Voltage Error The errors due to offset, common mode, power supply variation, gain and temperature are all included in the offset voltage specification. This makes it easy to compute the error when using the LTC1040. Example: error computation for Figure 4. Assume: 2.8V ≤ VS ≤ 6V. Then total worst-case error is: Note: If source resistance exceeds 10k, bypass capacitors should be used and the associated errors must be included. Pulsed Power (VP-P) Output It is often desirable to use comparators with resistive networks such as bridges. Because of the extremely low power consumption of the LTC1040, the power consumed by these resistive networks can far exceed that of the device itself. At low sample rates the LTC1040 spends most of its time off. To take advantage of this, a pulsed power (VP-P) output is provided. VP-P is switched to V+ when the comparator is on and to a high impedance (open circuit) when the comparator is off. The ON time is nominally 80 µs. Figure 5 shows the VP-P output circuit. The VP-P output voltage is not precise (see VP-P Output Voltage versus Load Current curve). There are two ways VP-P can be used to power external networks without excessive errors: (1) ratiometric networks and (2) fast settling references. In a ratiometric network, the inputs are all proportional to VP-P (see Figure 6). Consequently, for small changes, the absolute value of VP-P does not affect accuracy. It is critical that the inputs to the LTC1040 completely settle within 4 µs of the start of the comparison cycle and that they do not change during the 80 µs ON time. When driving resistive networks with VP-P, capacitive loading on the network should be minimized to meet the 4 µs settling time requirement. It is not recommended that VP-P be used to drive networks with source impedances, as seen by the inputs, of greater than 10k Ω. In applications where an absolute reference is required, the VP-P output can be used to drive a fast settling reference. The LT1009 2.5V reference, ideal in this application, settles in approximately 2 µs (see Figure 7). The current through R1 must be large enough to supply the LT1009 minimum bias current ( ≈1mA) and the load current, IL. LTC1040 • AI05 80 µs COMPARATOR ON TIME 18 V+ 917 GND Q1 P1 VP-P Figure 7. Driving Reference with VP-P Output Figure 6. Ratiometric Network Driven by VP-P Figure 5. VP-P Output Switch = ±6mA IL (ERROR) = ± (100mV • 0.001 + 0.5mV) • ↑↑ Tracking Error VOS IL (ERROR)% = • 100 = ± 0.6%. 6mA 1A VIN VTRIP OUTPUT VP-P OUTPUT LTC1040 • AI06 – –+ – + + 1/2 LTC1040 VIN IL VP-P OUTPUT LTC1040 • AI07 – – + + 1/2 LTC1040 R2 R3 LT1009 R1 |
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