ADC1251

Contents

The ADC1251 is a CMOS 12-bit plus sign successive approximation analog-to-digital converter. On request, the ADC1251 goes through a self-calibration cycle that adjusts for any zero, full scale, or linearity errors. The ADC1251 also has the ability to go through an Auto-Zero cycle that corrects the zero error during every conversion.

The analog input to the ADC1251 is tracked and held by the internal circuitry, so an external sample-and-hold is not required. The ADC1251 has an S#/H control input which directly controls the track-and-hold state of the A/D. A unipolar analog input voltage range (0 to +5V) or a bipolar range (-5V to +5V) can be accommodated with ±5V supplies.

The 13-bit data result is available on the eight outputs of the ADC1251 in two bytes, high-byte first and sign extended. The digital inputs and outputs are compatible with TTL or CMOS logic levels.

• Self-calibration provides excellent temperature stability
• Internal sample-and-hold
• 8-bit µP/DSP interface
• Bipolar input range with a single +5V reference
• No missing codes over temperature
• TTL/MOS input/output compatible

• Resolution: 12 bits plus sign
• Conversion Time: 8 µs (max)
• Sampling Rate: 83 kHz (max)
• Linearity Error: ±0.6 LSB (±0.0146%) (max)
• Zero Error: ±1 LSB (max)
• Full Scale Error: ±1.5 LSB (max)
• Power Consumption @±5V: 113 mW (max)

• Digital signal processing
• High resolution process control
• Instrumentation