Datasheet MAX6325 (Analog Devices) - 8
| Fabricante | Analog Devices |
| Descripción | 1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V Voltage References |
| Páginas / Página | 11 / 8 — 1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V Voltage References. … |
| Formato / tamaño de archivo | PDF / 556 Kb |
| Idioma del documento | Inglés |
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V Voltage References. _____________________Pin Description. Noise Reduction. PIN. NAME
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MAX6325/MAX6341/MAX6350 MAX6325/MAX6341/MAX6350
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V Voltage References _____________________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. connection for wideband noise 3 NR reduction. Leave open if not used
Bypassing
(Figure 2). The MAX6325/MAX6341/MAX6350 are stable with capacitive load values from 0µF to 100µF, for all values 4 GND Ground of load current. Adding an output bypass capacitor can External Trim Input. Allows ±1% help reduce noise and output glitching caused by load 5 TRIM output adjustment (Figure 1). transients. Leave open if not used.
__________Applications Information
6 OUT Voltage Reference Output
Negative Regulator
Figure 3 shows how both a +5V and -5V precision ref-
_______________Detailed Description
erence can be obtained from a single, unregulated +5V supply. A MAX865 generates approximately ±9V to
Temperature Stability
operate the MAX6350 reference and MAX400 inverting The MAX6325/MAX6341/MAX6350 are highly stable, amplifier. The +5V is inverted by the ultra-low offset low-noise voltage references that use a low-power tem- MAX400 op amp. Resistor R1 is optional, and may be perature-compensation scheme to achieve laboratory- used to trim the ±5V references. R2 and R4 should be standard temperature stability. This produces a nearly matched, both in absolute resistance and temperature flat temperature curve, yet does not require the power coefficient. R3 is optional, and is adjusted to set the -5V associated with heated references. reference. The output voltage can be trimmed a minimum of 0.6% by connecting a 10kΩ potentiometer between OUT and GND, and connecting its tap to the TRIM pin, as shown in Figure 1. The external trimming does not affect tem- perature stability. 8V TO 36V INPUT 8V TO 36V INPUT IN IN REFERENCE OUT REFERENCE OUT OUT OUT MAX6325 MAX6325 MAX6341 * MAX6341 MAX6350 MAX6350 NR TRIM 10kΩ NR TRIM GND 1µF GND *OPTIONAL Figure 1. Output Voltage Adjustment Figure 2. Noise-Reduction Capacitor 8 Maxim Integrated
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V Voltage References _____________________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. connection for wideband noise 3 NR reduction. Leave open if not used
Bypassing
(Figure 2). The MAX6325/MAX6341/MAX6350 are stable with capacitive load values from 0µF to 100µF, for all values 4 GND Ground of load current. Adding an output bypass capacitor can External Trim Input. Allows ±1% help reduce noise and output glitching caused by load 5 TRIM output adjustment (Figure 1). transients. Leave open if not used.
__________Applications Information
6 OUT Voltage Reference Output
Negative Regulator
Figure 3 shows how both a +5V and -5V precision ref-
_______________Detailed Description
erence can be obtained from a single, unregulated +5V supply. A MAX865 generates approximately ±9V to
Temperature Stability
operate the MAX6350 reference and MAX400 inverting The MAX6325/MAX6341/MAX6350 are highly stable, amplifier. The +5V is inverted by the ultra-low offset low-noise voltage references that use a low-power tem- MAX400 op amp. Resistor R1 is optional, and may be perature-compensation scheme to achieve laboratory- used to trim the ±5V references. R2 and R4 should be standard temperature stability. This produces a nearly matched, both in absolute resistance and temperature flat temperature curve, yet does not require the power coefficient. R3 is optional, and is adjusted to set the -5V associated with heated references. reference. The output voltage can be trimmed a minimum of 0.6% by connecting a 10kΩ potentiometer between OUT and GND, and connecting its tap to the TRIM pin, as shown in Figure 1. The external trimming does not affect tem- perature stability. 8V TO 36V INPUT 8V TO 36V INPUT IN IN REFERENCE OUT REFERENCE OUT OUT OUT MAX6325 MAX6325 MAX6341 * MAX6341 MAX6350 MAX6350 NR TRIM 10kΩ NR TRIM GND 1µF GND *OPTIONAL Figure 1. Output Voltage Adjustment Figure 2. Noise-Reduction Capacitor 8 Maxim Integrated