Datasheet MAX873, MAX875, MAX876 (Analog Devices) - 9

Low-Power, Low-Drift, +2.5V/+5V/+10V Precision Voltage References MAX873/MAX875/MAX876 Typical Operating Characteristics (continued)
(VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA = +25°C, unless otherwise noted.)
TURN-ON TRANSIENT TURN-ON TRANSIENT (VOUT = 10V, COUT = 0) (VOUT = 10V, COUT = 1
µ
F)
MAX873/75/76 toc39 MAX873/75/76 toc40 VIN VIN 5V/div 5V/div GND GND VOUT VOUT 5V/div 5V/div GND GND 100µs/div 200µs/div
Pin Description PIN NAME FUNCTION
1, 8 I.C. Internally Connected. Do not connect externally. 2 IN Positive Power-Supply Input Temperature Proportional Output Voltage. TEMP generates an output voltage proportional to the die 3 TEMP temperature. 4 GND Ground Output Voltage Trim. Connect TRIM to the center of a voltage-divider between OUT and GND for 5 TRIM trimming. Leave unconnected to use the preset output voltage. 6 OUT Output Voltage 7 N.C. No Connection. Not internally connected.
Detailed Description
Use the following formula to calculate the change in output voltage from its preset value: The MAX873/MAX875/MAX876 precision voltage refer- ences provide accurate preset +2.5V, +5.0V, and +10V ∆VOUT = 2 x (VTRIM - VTRIM (open)) x k reference voltages from up to +40V input voltages. These where: devices feature a proprietary temperature-coefficient V curvature-correction circuit and laser-trimmed thin-film TRIM = 0V to VOUT resistors that result in a very low 3ppm/°C temperature VTRIM (open) = VOUT (nominal) / 2 (typ) coefficient and excellent 0.05% initial accuracy. The k = ±6% (typ) MAX873/MAX875/MAX876 draw 340µA of supply current For example, use a 50kΩ potentiometer (such as the and source 30mA or sink 2mA of load current. MAX5436) between OUT, TRIM, and GND with the
Trimming the Output Voltage
potentiometer wiper connected to TRIM (see Figure 2). Trim the factory-preset output voltage on the As the TRIM voltage changes from VOUT to GND, the MAX873/MAX875/MAX876 by placing a resistive divider output voltage changes accordingly. Set R2 to 1MΩ or network between OUT, TRIM, and GND. less. Currents through resistors R1 and R2 add to the quiescent supply current.
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