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ADR1581ARTZ-REEL71 Datasheet(PDF) 10 Page - Analog Devices |
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ADR1581ARTZ-REEL71 Datasheet(HTML) 10 Page - Analog Devices |
10 / 12 page ADR1581 Rev. 0 | Page 10 of 12 USING THE ADR1581 WITH 3 V DATA CONVERTERS The ADR1581 is ideal for creating the reference level to use with 12-bit multiplying DACs, such as the AD7943, AD7945, and AD7948. In the single-supply bias mode (see Figure 25), the impedance seen looking into the IOUT2 terminal changes with DAC code. If the ADR1581 drives IOUT2 and AGND directly, less than 0.2 LSBs of additional linearity error results. The buffer amp eliminates linearity degradation resulting from variations in the reference level. The ADR1581 low output drift (50 ppm/°C) and compact subminiature SOT-23 package make it ideally suited for today’s high performance converters in space-critical applications. One family of ADCs for which the ADR1581 is well suited is the AD7714-3 and AD7715-3. The AD7714/AD7715 are charge- balancing (∑-Δ) ADCs with on-chip digital filtering intended for the measurement of wide dynamic range, low frequency signals, such as those representing chemical, physical, or biological processes. DAC RFB AGND DGND A1 C1 3.3V 29.4kΩ 3.3V ADR1581 SIGNAL GROUND A1: OP295 AD822 OP2283 A1 VREF VIN VDD IOUT1 IOUT2 VOUT AD7943 Figure 24 shows the ADR1581 connected to the AD7714/AD7715 for 3 V operation. AD7714-3/AD7715-3 ADR1581 3V 28.7kΩ REF IN(+) REF IN(–) HIGH IMPEDANCE >1GΩ RSW 5kΩ (TYP) CREF (3pF TO 8pF) SWITCHING FREQUENCY DEPENDS ON fCLKIN Figure 24. Reference Circuit for the AD7714-3/AD7715-3 Figure 25. Single-Supply System |
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