Datasheet MAX6220 (Analog Devices) - 8
| Manufacturer | Analog Devices |
| Description | Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage Reference |
| Pages / Page | 10 / 8 — Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage Reference. … |
| File Format / Size | PDF / 791 Kb |
| Document Language | English |
Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage Reference. _____________________Pin Description. Noise Reduction. PIN. NAME
Model Line for this Datasheet
Text Version of Document
Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage Reference _____________________Pin Description Noise Reduction
To augment wideband noise reduction, add a 1µF capacitor to the NR pin (Figure 2). Larger values do not
PIN NAME FUNCTION
improve noise appreciably (see Typical Operating 1, 7, 8 I.C. Internally Connected.
Do not use
. Characteristics). 2 IN Positive Power-Supply Input Noise in the power-supply input can affect output noise, but can be reduced by adding an optional Noise Reduction. Optional capacitor bypass capacitor to the IN pin and GND.
MAX6220
connection for wideband noise 3 NR reduction. Leave open if not used
Bypassing
(Figure 2). The MAX6220 is stable with capacitive load values from 0µF to 100µF, for all values of load current. Adding an 4 GND Ground output bypass capacitor can help reduce noise and External Trim Input. Allows ±1% output glitching caused by load transients. 5 TRIM output adjustment (Figure 1).
Applications Information
Leave open if not used. 6 OUT Voltage Reference Output
Negative Regulator
Figure 3 shows how both a +5V and -5V precision ref- erence can be obtained from a single unregulated +5V
Detailed Description
supply. The MAX865 generates approximately ±9V to operate both the MAX6220 reference and the MAX480
Temperature Stability
inverting amplifier. The +5V is inverted by the MAX480. The MAX6220 is a highly stable, low-noise voltage ref- Resistor R1 is optional, and may be used to trim the erence that uses a low-power temperature-compensa- ±5V references. R2 and R4 should be matched, both in tion scheme to achieve laboratory-standard temper- absolute resistance and temperature coefficient. R3 is ature stability. This produces a nearly flat temperature optional, and is adjusted to set the -5V reference. curve, yet does not require the power associated with heated references. The output voltage can be trimmed 0.6% (min) by con- necting a 10kΩ potentiometer between OUT and GND, and connecting its tap to the TRIM pin (Figure 1). The external trimming does not affect temperature stability. 8V TO 40V INPUT 8V TO 40V INPUT IN IN REFERENCE OUT REFERENCE OUT OUT OUT MAX6220 2.2µF* MAX6220 10kΩ NR TRIM NR TRIM GND 1µF GND *OPTIONAL Figure 1. Output Voltage Adjustment Figure 2. Noise-Reduction Capacitor
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To augment wideband noise reduction, add a 1µF capacitor to the NR pin (Figure 2). Larger values do not
PIN NAME FUNCTION
improve noise appreciably (see Typical Operating 1, 7, 8 I.C. Internally Connected.
Do not use
. Characteristics). 2 IN Positive Power-Supply Input Noise in the power-supply input can affect output noise, but can be reduced by adding an optional Noise Reduction. Optional capacitor bypass capacitor to the IN pin and GND.
MAX6220
connection for wideband noise 3 NR reduction. Leave open if not used
Bypassing
(Figure 2). The MAX6220 is stable with capacitive load values from 0µF to 100µF, for all values of load current. Adding an 4 GND Ground output bypass capacitor can help reduce noise and External Trim Input. Allows ±1% output glitching caused by load transients. 5 TRIM output adjustment (Figure 1).
Applications Information
Leave open if not used. 6 OUT Voltage Reference Output
Negative Regulator
Figure 3 shows how both a +5V and -5V precision ref- erence can be obtained from a single unregulated +5V
Detailed Description
supply. The MAX865 generates approximately ±9V to operate both the MAX6220 reference and the MAX480
Temperature Stability
inverting amplifier. The +5V is inverted by the MAX480. The MAX6220 is a highly stable, low-noise voltage ref- Resistor R1 is optional, and may be used to trim the erence that uses a low-power temperature-compensa- ±5V references. R2 and R4 should be matched, both in tion scheme to achieve laboratory-standard temper- absolute resistance and temperature coefficient. R3 is ature stability. This produces a nearly flat temperature optional, and is adjusted to set the -5V reference. curve, yet does not require the power associated with heated references. The output voltage can be trimmed 0.6% (min) by con- necting a 10kΩ potentiometer between OUT and GND, and connecting its tap to the TRIM pin (Figure 1). The external trimming does not affect temperature stability. 8V TO 40V INPUT 8V TO 40V INPUT IN IN REFERENCE OUT REFERENCE OUT OUT OUT MAX6220 2.2µF* MAX6220 10kΩ NR TRIM NR TRIM GND 1µF GND *OPTIONAL Figure 1. Output Voltage Adjustment Figure 2. Noise-Reduction Capacitor
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