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REF5045 Datasheet(PDF) 1 Page - Texas Instruments |
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REF5045 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 62 page  GND REF ADS8881 AINP AINM AVDD DVDD DIN SCLK DOUT CONVST 0 V - VREF VCM VREF 0 V 0 V VREF +VREF -VREF VCM VDIFF 0 V - VREF 2.5 V to 5 V 2.7 V to 3.6 V Traditional Input Range ADS8881 Input Range VREF/2 2.7 V to 3.6 V Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. ADS8881 SBAS547D – MAY 2013 – REVISED AUGUST 2015 ADS8881x 18-Bit, 1-MSPS, Serial Interface, microPower, Miniature, True-Differential Input, SAR Analog-to-Digital Converter 1 1 Features 1 • Sample Rate: 1 MHz • No Latency Output • Unipolar, True-Differential Input Range: –VREF to +VREF • Wide Common-Mode Voltage Range: 0 V to VREF with 90-dB CMRR (min) • SPI™-Compatible Serial Interface with Daisy-Chain Option • Excellent AC and DC Performance: – ADS8881C: INL: ±1 LSB (typ), ±2.0 LSB (max) DNL: ±1.0 LSB (max), 18-Bit NMC SNR: 100 dB, THD: –115 dB – ADS8881I: INL: ±1.5 LSB (typ), ±3.0 LSB (max) DNL: +1.5 and –1 LSB (max), 18-Bit NMC SNR: 100 dB, THD: –115 dB • Wide Operating Range: – AVDD: 2.7 V to 3.6 V – DVDD: 2.7 V to 3.6 V (Independent of AVDD) – REF: 2.5 V to 5 V (Independent of AVDD) – Operating Temperature: ADS8881C : 0°C to +70°C ADS8881I : –40°C to +85°C • Low-Power Dissipation: – 5.5 mW at 1 MSPS – 0.55 mW at 100 kSPS – 55 µW at 10 kSPS • Power-Down Current (AVDD): 50 nA • Full-Scale Step Settling to 18 Bits: 290 ns • Packages: MSOP-10 and VSON-10 2 Applications • Automatic Test Equipment (ATE) • Instrumentation and Process Controls • Precision Medical Equipment • Low-Power, Battery-Operated Instruments 3 Description The ADS8881 is an 18-bit, 1-MSPS, true-differential input, analog-to-digital converter (ADC). The device operates with a 2.5-V to 5-V external reference, offering a wide selection of signal ranges without additional input signal scaling. The reference voltage setting is independent of, and can exceed, the analog supply voltage (AVDD). The device offers an SPI-compatible serial interface that also supports daisy-chain operation for cascading multiple devices. An optional busy- indicator bit makes synchronizing with the digital host easy. The device supports unipolar, true-differential analog input signals with a differential input swing of –VREF to VREF. This true-differential analog input structure allows for a common-mode voltage of any value in the range of 0 V to VREF (when both inputs are within the operating input range of –0.1 V to VREF + 0.1 V). Device operation is optimized for very low-power operation. Power consumption directly scales with speed. This feature makes the ADS8881 excellent for lower-speed applications. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) ADS8881x VSSOP (10) 3.00 mm × 3.00 mm VSON (10) 3.00 mm × 3.00 mm (1) For all available packages, see the orderable addendum at the end of the datasheet. True-Differential Input Range |
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