26 bit, Charge Balanced A/D Converter - ADC 180
• INERTIAL GUIDANCE
• TEST EQUIPMENT
• DATA ACQUISITION
• SCIENTIFIC INSTRUMENTS
• MEDICAL INSTRUMENTS
• WEIGHT SCALES
FEATURES
• 26 BIT RESOLUTION
• UP TO 2.5kHz CONVERSION RATES
• AUTO ZERO FUNCTION
• ±10.48 V INPUT RANGE
• 0.5ppm/°C MAX. SCALE FACTOR ERROR
AND 2 ppm MAX. LINEARITY ERROR
(-55°C to +125°C).
• 8 BIT PARALLEL DATA BUS
• INTERNAL CRYSTAL CLOCK and
PRECISION REFERENCE
• LOW POWER CONSUMPTION: 0.4 WATTS
DESCRIPTION
The ADC180 is a 26 bit, charge balanced A/D converter. Continuous sampling of 20 MHz and conversion rates of up to 2.5kHz make the converter ideal for low frequency signal measurement. The integration time is user selectable through an external capacitor.
The ADC180 will continuously collect and average integrations until the user requests data. Converter resolution is dependent on the number of integration cycles completed before the data is requested. Converter resolution ranges from 13 - 26 bits.
In order to retain accuracy, internal calculations are made at a 32 bit level. The output of the result is also made at the 32 bit level. This makes it possible to use a relatively high conversion rate and average the data external to the converter without loss of accuracy due to computation roundoff errors. For inertial guidance systems, velocity information can be obtained at a high rate without loss of position accuracy.
The use of hybrid technology allows for separation of sensitive analog circuitry from digital circuit noise. This produces far superior accuracy over monolithic A/D convertors.
The converter uses a proprietary, patented charge balance modulator. It has an internal crystal clock, microcontroller, precision reference, and patented nonlinear temperature compensation network which provides excellent electrical performance over temperature.
The maximum scale factor drift is 0.5ppm/o C, maximum offset drift of 0.1ppm/o C, and a maximum nonlinearity over the mil. temp. range of 2ppm. The ADC180 is packaged in a 40 pin hermetic TDIP and requires ±15V and +5V supplies. The converter dissipates 450 mW and is available in commercial and military grades.
Thaler Corporation, 2015 N. Forbes Blvd., #109, Tucson, AZ 85745. Tel: 520-882-4000; Fax: 520-770-9222.