AD7418 Datasheet

• 10-bit ADC with 15 μs and 30 μs conversion times
• 1 single-ended analog input channel
• On-chip temperature sensor: −40°C to +125°C
• On-chip track-and-hold
• Overtemperature indicator
• Automatic power-down at the end of a conversion
• Wide operating supply range: 2.7 V to 5.5 V
• I²C-compatible serial interface
• Selectable serial bus address allows connection of up to 8 AD7416/AD7417 devices to a single bus

• Data acquisition with ambient temperature monitoring
• Industrial process control
• Automotive
• Battery-charging applications
• Personal computers

The AD7418 are 10-bit, 4-channel and single-channel ADCs with an on-chip temperature sensor that can operate from a single 2.7 V to 5.5 V power supply. The devices contain a 15 μs successive approximation converter, a 5-channel multiplexer, a temperature sensor, a clock oscillator, a track-and-hold, and a reference (2.5 V).

The temperature sensor on the parts can be accessed via multiplexer Channel 0. When Channel 0 is selected and a conversion is initiated, the resulting ADC code at the end of the conversion gives a measurement of the ambient temperature (±1°C @ 25°C). On-chip registers can be programmed with high and low temperature limits, and an open-drain overtemperature indicator (OTI) output is provided, which becomes active when a programmed limit is exceeded.

A configuration register allows programming of the sense of the OTI output (active high or active low) and its operating mode (comparator or interrupt). A programmable fault queue counter allows the number of out-of-limit measurements that must occur before triggering the OTI output to be set to prevent spurious triggering of the OTI output in noisy environments.

An I²C^® compatible serial interface allows the AD7418 registers to be written to and read back.

The AD7418 are available in 8-lead SOIC and MSOP packages.

Product Highlights

1. The AD7418 have an on-chip temperature sensor that allows an accurate measurement of the ambient temperature (±1°C @ 25°C, ±2°C overtemperature) to be made. The measurable temperature range is −40°C to +125°C. An overtemperature indicator is implemented by carrying out a digital comparison of the ADC code for Channel 0 (temperature sensor) with the contents of the on-chip TOTI setpoint register.
2. The automatic power-down feature enables the AD7418 to achieve superior power performance. At slower throughput rates, the part can be programmed to operate in a low power shutdown mode, allowing further savings in power consumption.