Datasheet MAX6033 (Maxim) - 10

MAX6033 High-Precision, Low-Dropout SOT23 Series Voltage Reference
Pin Description PIN NAME FUNCTION
IN ISOURCE
MAX6033
1, 3 I.C. Internally Connected. Do not connect OUTF externally. 2 GND Ground OUTS 4 IN Positive Power-Supply Input GND Voltage Reference Force Output. Short 5 OUTF OUTF to OUTS as close to the device as possible. Bypass OUTF with 0.1µF Figure 1. Precision Current Source (min) capacitor to GND. 6 OUTS Voltage Reference Sense 3V SUPPLY
Applications Information
IN VDD
Bypassing/Load Capacitance MAX6033 MAX5143
For the best line-transient performance, decouple the
DAC
input with a 0.1µF ceramic capacitor as shown in the OUT REF OUT ANALOG Typical Operating Circuit. Place the capacitor as close OUTPUT to IN as possible. When transient performance is less important, no capacitor is necessary. GND GND The MAX6033 family requires a minimum output capac- itance of 0.1µF for stability and is stable with capacitive loads (including the bypass capacitance) of up to 100µF. Figure 2. 14-Bit High-Resolution DAC and Positive Reference In applications where the load or the supply can expe- from a Single 3V Supply rience step changes, a larger output capacitor reduces the amount of overshoot (undershoot) and improves the circuit’s transient response. Place output capacitors as the bandgap core transistors. The typical temperature close to the device as possible. hysteresis value is 150ppm.
Supply Current Turn-On Time
The quiescent supply current of the MAX6033 series ref- These devices typically turn on and settle to within 0.01% erence is typically 40µA and is virtually independent of the of their final value in >1µs. The turn-on time can increase supply voltage. In the MAX6033 family, the load current up to 2ms with the device operating at the minimum drop- is drawn from the input only when required, so supply out voltage and the maximum load. current is not wasted and efficiency is maximized at all
Precision Current Source
input voltages. This improved efficiency reduces power Figure 1 shows a typical circuit providing a precision cur- dissipation and extends battery life. rent source. The OUTF output provides the bias current When the supply voltage is below the minimum-specified for the bipolar transistor. OUTS senses the voltage across input voltage (as during turn-on), the devices can draw up the resistor and adjusts the current sourced by OUTF to 150µA beyond the nominal supply current. The input accordingly. voltage source must be capable of providing this current to ensure reliable turn-on.
High-Resolution DAC and Reference from Single Supply Output-Voltage Hysteresis
Figure 2 shows a typical circuit providing both the Output voltage hysteresis is the change in the output volt- power supply and reference for a high-resolution DAC. A age at TA = +25°C before and after the device is cycled MAX6033 with 2.5V output provides the reference voltage over its entire operating temperature range. Hysteresis is for the DAC. caused by differential package stress appearing across www.maximintegrated.com Maxim Integrated │ 10 Document Outline _GoBack