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Sigma-delta analogue-to-digital converters

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article image Maxim MAX7705 ADC.

MAXIM Integrated Products, represented by Arrow , has introduced the MAX1415,MAX1416 and MX7705 high-resolution 16-bit, dual-channel, sigma-delta analogue-to-digital converters (ADCs).

These ADCs interface directly to SPI-, QSPI- and MICROWIRE-compatible microcontrollers and DSPs.

Low-power consumption (1mW max at 3V) and accurate dc or low-frequency ac measurement makes these devices suitable for process control, industrial transmitters, instrumentation, and data-acquisition applications.

To reduce signal-conditioning requirements, a 1:128 programmable-gain amplifier (PGA) allows these ADCs to accept input signals directly from low-level signals, such as those from a strain gage or transducer.

On-chip input buffers allow the measurement of high-impedance signals, which can be disabled for a direct input path into the ADC.

The MX7705 is pin- and software-compatible with the AD7705.

For good performance, the MAX1415* and MAX1416* have improved linearity over the MX7705, as well as an internal oscillator. This internal oscillator is tightly specified and provides timing for the MAX1415 and MAX1416, eliminating requirements for an external crystal, resonator, or clock source.

The MAX1415 and MAX1416 offer an improvement in integral nonlinearity error over the AD7705 and MX7705 (0.0015% FSR vs. 0.003% FSR INL).

These ADCs features two fully differential input channels with programmable unipolar or bipolar input ranges. A differential, external-reference input determines the full-scale range.

The MAX1415 and MX7705 consume 0.3mA of current when using a 3V supply, and the MAX1416 and MX7705 consume 0.45mA of current with a 5V supply. The power-down mode further reduces supply current to 8μA.

The MAX1415, MAX1416 and MX7705 are available in 16-pin TSSOP, SSOP, and PDIP packages in the extended (-40°C to +85°C) temperature range.

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