AD7417 Datasheet

• 10-bit ADC with 15 μs and 30 μs conversion times
• 4 single-ended analog input channels
• 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 AD7417 devices to a single bus

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

The AD7417 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 AD7417 registers to be written to and read back. The three LSBs of the AD7417 serial bus address can be selected, which allows up to eight AD7417 devices to be connected to a single bus.

The AD7417 is available in a narrow body, 0.15 inch, 16-lead, small outline package (SOIC) and in a 16-lead, thin shrink, small outline package (TSSOP).

Product Highlights

1. The AD7417 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 AD7417 offers a space-saving, 10-bit analog-to-digital solution with four external voltage input channels, an onchip temperature sensor, an on-chip reference, and a clock oscillator.
3. The automatic power-down feature enables the AD7417 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.