AD7170

The AD7170 is a very low power 12-bit analog-to-digital converter (ADC). It contains a precision 12-bit sigma-delta (-) ADC and an on-chip oscillator. Consuming only 135 A, the AD7170 is particularly suitable for portable or battery operated products where very low power is a requirement. The AD7170 also has a power-down mode in which the device consumes 5 A, thus increasing the battery life of the product.

Features of the AD7170 are:(1)output data rate: 125 Hz; (2)pin-programmable power-down and reset; (3)status function; (4)internal clock oscillator; (5)current: 135 A; (6)power supply: 2.7 V to 5.25 V; (7)-40 to +105 temperature range; (8)package: 10-lead 3 mm x 3 mm LFCSP.The output data rate of the AD7170 is 125 Hz, whereas the settling time is 24 ms.The AD7170 has one differential input and a gain of 1. This is useful in applications where the user needs to use an external amplifier to implement system-specific filtering or gain requirements.

The absolute maximum ratings of the AD7170 can be summarized as:(1)VDD to GND:-0.3V to +7V;(2)storage temperature range:-65 to +150;(3)soldering temperature:260;(4)lead temperature:260;(5)analog input voltage to GND:-0.3 V to VDD + 0.3V;(6)Vinx/digital input current:10 mA.Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.When a step change occurs on the analog input, the AD7170 requires several conversion cycles to generate a valid conversion.If the step change occurs synchronous to the conversion period,then the settling time of the AD7170 must be allowed to generate a valid conversion. If the step change occurs asynchronous to the end of a conversion, then an extra conversion must be allowed to generate a valid conversion. The data register is updated with all the conversions but, for an accurate result, the user must allow the required time.