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MAX6610 Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX6610 Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 6 page Detailed Description The MAX6610/MAX6611 combine a temperature sensor with a low-power voltage reference. The reference volt- age and temperature sensor gain give convenient LSB weights when used with an ADC. For example, when an 8-bit ADC is used with the MAX6610/MAX6611, an LSB is equivalent to 1°C and a 10-bit ADC LSB is equivalent to 0.25°C. The reference output features a proprietary tempera- ture-coefficient, curvature-correction circuit and laser- trimmed thin-film resistors that result in a low temperature coefficient (50ppm/°C max) and initial accuracy of ±0.5% max. The maximum supply current is 250µA during normal operation and 1µA max during shutdown. The supply voltage range is 3.0V to 5.5V for the MAX6610 and 4.5V to 5.5V for the MAX6611. Voltage Reference The MAX6610/MAX6611 REF output provides a voltage reference for ADCs or other system subcircuits. REF is capable of driving loads of up to 1mA. An output capacitor can be as large as 1µF. The voltage reference provides scaled ADC conver- sions with bit weights that are in convenient units. For the MAX6610 (2.56V REF output), an 8-bit ADC yields 10mV/bit or 2.5mV/bit for a 10-bit ADC. The MAX6611 (4.096V REF output) yields 16mV/bit for an 8- bit ADC or 4mV/bit for a 10-bit ADC. Temperature Sensor The MAX6610/MAX6611 TEMP output provides an ana- log output voltage that is a linear function of its die tem- perature as defined by: VTEMP = 1.2V + (T°C ✕ 16mV/°C) for the MAX6611 and VTEMP = 0.75V + (T°C ✕ 10mV/°C) for the MAX6610 The slope of the output voltage is VREF/256 per °C (16mV/°C for the MAX6611 and 10mV/°C for the MAX6610). There is a +75°C offset on the temperature output (The MAX6611’s output is 1.2V and, the MAX6610’s output is 0.75V) at 0°C. The temperature error is less than 1.2°C at TA = +25°C, less than ±3.8°C from TA = -20°C to +85°C, and only ±5°C for TA = -40°C to +125°C. Shutdown The MAX6610/MAX6611 are equipped with a shutdown feature that, when driven low, shuts down all internal cir- cuitry and reduces supply current to 1µA (max). When in shutdown, REF is pulled to GND through a 150k Ω resis- tor and TEMP goes to a high-impedance state. For nor- mal operation, connect SHDN to VCC. Applications Information Output/Load Capacitance The MAX6610/MAX6611 TEMP output can drive capac- itive loads up to 0.2µF. The MAX6610/MAX6611 REF output can drive capacitive loads up to 1µF. Devices in this family do not require an output capacitance for dynamic stability. However, in applications where the load or the supply can experience step changes, an output capacitor within the specified range reduces the amount of overshoot (or undershoot) and assists the circuit’s transient response. Many applications do not need an external capacitor, and this family can offer a significant advantage in these applications when board space is critical. Supply Current The quiescent supply current of the MAX6610/ MAX6611 is typically 150µA and is virtually indepen- dent of the supply voltage. Unlike shunt-mode refer- ences, the load current of series-mode references is drawn from the supply voltage only when required, so supply current is not wasted and efficiency is maxi- mized over the entire supply voltage range. This improved efficiency can help reduce power dissipation and extend battery life. Precision, Low-Power, 6-Pin SOT23 Temperature Sensors and Voltage References 4 _______________________________________________________________________________________ PIN NAME FUNCTION 1VCC Supply Voltage Input. Bypass to GND with a 0.1µF capacitor. 2 GND Ground 3 SHDN Logic Level Shutdown Input (Active Low). Driving SHDN with a logic low turns off internal circuitry to reduce supply current to 1µA (max). 4 TEMP Temperature Output Pin. Voltage at TEMP varies linearly with temperature. 5 REF Reference Voltage Output 6 GND Must be connected to pin 2. Pin Description |
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