Overview:
The AD1582, AD1583, AD1584 and AD1585 are a family of low cost, low power, low dropout, high precision bandgap references. These are designed to be available in three-terminal (series) devices and in a compact SOT-23, 3-pin, surface mount package. The versatility of these references makes them ideal for use in battery-operated 3 V or 5 V systems where wide variation in supply voltage and need to reduce power dissipation may exist. The superior accuracy and temperature stability of the AD1582/AD1583/AD1584/AD1585 are made possible by precisely matched and thermally traced chip components. A patented temperature drift curvature correction design technique has been used to minimize the non-linear temperature characteristics of the output voltage. These series mode devices (AD1582/AD1583/AD1584/AD1585) will source or sink up to 5mA of load current and operate efficiently with only 200mV of space required. This family will have only a maximum quiescent current of 65µA with a 1.0µA/V supply voltage change. These advantages over conventional diverter designs are extraordinary. Valuable supply current is no longer wasted by the input series resistance and efficiency reaches maximum power at all input voltage levels. The AD1582, AD1583, AD1584 and AD1585 are available in two grades, A and B, both of which offer the smallest package available on the market, using SOT-23. Both grades are specified for operation over the industrial temperature range of -40°C to +85°C

Target application:
1. Portable battery powered device. Laptops, mobile phones, pagers, PDAs, GPSs and DMMs.
2. computer workstation. Suitable for RAMDACs with a wide range of video usage.
3. Smart industrial transmitter.
4. PCMCIA card.
5. car.
6. Hard disk drive.
7. 3V/5V 8-bit 12-bit data converter.

Packaging brand information:
Four flag fields identify device generic, grade and date handling. The first field is product identification. A "2/3/4/5" is identified as generic to the AD1582/3/4/5. The second field indicates the equipment grade, "A" or "B" in the third field a number or letter indicates the calendar year, "7" 1997. . . , "A" for 2001. . . The fourth field uses the letters A-Z to represent a two-week window within a calendar year, beginning with an "A" two weeks before the month of January.

AD1582/AD1583/AD1584/AD1585 -8 - REV's. A principle of operation:
The AD1582/AD1583/AD1584/AD1585 "bandgap" concept for home use produces stable, low temperature coefficient voltage references suitable for high precision data acquisition components and systems. This high-precision reference series enables the use of the underlying temperature characteristics to study the base-emitter voltage of silicon transistors in the forward-biased operating region. Under this condition, all these transistors have a temperature coefficient (TC) of -2 mV/°C and a VBE, when extrapolated to absolute zero, 0°K, (proportional to collector current absolute temperature) close to Band gap voltage of silicon. By summing the voltages, having an equal and opposite temperature coefficient of +2 mV for the same forwardbiased VBE/°C transistor, a zero TC reference can be developed. In the AD1582/AD1583/AD1584/AD1585 simplified circuit diagram shown in Figure 8, such a compensation voltage, V1, is derived from driving the two transistors at different current densities and the resulting VBE amplification difference (ΔVBE, which has a positive training class). The sum of VBE and V1 (VBG) is then buffer amplified to produce stable reference voltage outputs of 2.5V, 3V, 4.096V and 5V.

Temperature performance:
This series is a reference to the performance of the AD1582/AD1583/AD1584/AD1585 designed for applications where temperature is important. Extensive temperature testing and characterization ensures device performance is maintained within specified temperature ranges.
There is some confusion, but in the area, the errors in defining and specifying reference voltages vary with temperature. Historically, references have used the maximum deviation characteristic per degree Celsius, i.e. 50 parts per million/°C. However, due to inconsistent non-linearity of Zener reference standards (such as the "S" type characteristic), most manufacturers The characteristics of the maximum limit error band method used and its reference. Using this technique, the reference voltage's output voltage error band is three, taking the specified or output voltage measurement for more different temperatures.
The error band with the AD1582/AD1583/AD1584/AD1585 family is guaranteed to have a maximum deviation from the initial value at +25°C, this method is going to be a lot more than a designer using it just guarantees the maximum error band over the entire temperature change . Therefore, for a given grade of the AD1582/AD1583/AD1584/AD1585, the designer can easily determine the initial accuracy by summarizing the maximum total error over temperature (e.g., for the AD1582BRT, the initial tolerance is ±2 mV, the temperature error is ±8 mV in the band, so the reference is guaranteed to be 2.5 volts ±10-40°C to millivolts
+85°C). Figure 10 shows the typical output voltage drift of the AD1582 and illustrates the methodology. The box in Figure 10 is bounded by the operating temperature limit on the X-axis, and by the maximum and minimum output voltages observed on the Y-axis over the entire operating temperature range. Diagonal slope output values from initial draw at 25°C to output values between +85°C and -40°C determine the performance level of the device. Reproduction of these results requires a test system that is highly accurate and temperature controlled. Evaluating the AD1582 will yield a curve similar to Figure 4 and
10 digits, but output readings may vary depending on test method and test equipment used.