ADS7810U

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Analog to Digital Converters (ADC) are essential in electronic systems when signals from the physical world must be converted and analyzed. The ADS7810 is a versatile 12-bit, single-supply ADC from Texas Instruments which is designed to interface with a wide range of external signal sources. It is an improved version of the ADS7800 and combines a wide signal input range and high accuracy with a single-supply operation and low-cost packaging.

Features and Benefits

The key features of the ADS7810 include:

• Single Supply Operation – 2.7 to 5.5 V
• 12-Bit Resolution
  (93 microvolt extreme accuracy in ±2 V range)
• External TMUX-Compatible Multiplexer Control
• 20 MHz Minimum Clock
• Programmable Conversion Time (1 ms to 15 ms)
• Multiplexed and Single-Ended Inputs
• Internal Reference (1.24 V)
• Low Cost Packaging

These features make the ADS7810 suitable for a variety of applications such as mobile, automotive, industrial and consumer.

Application Fields

The ADS7810 is well suited for applications in factory automation, medical equipment, security systems, and instrumentation systems. In industrial applications, the wide variety of input ranges, quick conversion time and high sampling rate increase the accuracy of control and measurement systems. In consumer applications, the low power consumption and fast conversion time reduce power consumption. In addition, the ADS7810 is suited for portable and automotive applications where precision measurements are required with low power requirements.

Advantages of the ADS7810 include its low voltage operation, its low power consumption, and its compatibility with a wide variety of input sources. Additionally, the 12-bit resolution provides high accuracy and stability. This combination of features makes the ADS7810 well suited for low voltage, low power applications.

Working Principle

The AD7810 consists of an analog-to-digital converter, a multiplexer, and a reference circuit. The input analog signal is connected to the multiplexer, which is used to select the right input. The multiplexer is controlled by an external logic signal. The multiplexer then routes the analog input to the ADC. The analog input is then compared to the reference voltage, and the output from the ADC is a digital representation of the analog signal.

The reference voltage is supplied by a linear regulator, and the output of the linear regulator is clamped and regulated to create a stable output voltage to the ADC, which ensures a high-resolution conversion result. Additionally, the ADS7810 has an integrated reference circuit to provide more accurate conversion results. The reference circuit consists of a capacitor and resistor network, which together provide a stable and temperature-independent reference voltage.

The ADS7810 is a 32-pin device, with inputs and outputs located on the two opposite sides. There is an external connection for a power supply and two data lines for communication with an external microcontroller.

The ADS7810 supports two conversion speeds: fast and slow. The fast mode has a conversion rate of up to 20 MHz, while the slow mode has a conversion rate of up to 2 MHz. The conversion time depends on the speed. The measurement range for the ADS7810 is 0V to 5V, with a resolution of 12-bits. The result is outputted in the form of a digital signal.

In summary, the ADS7810 is a single-supply, 12-bit resolution, TMUX-compatible, low-cost ADC which is suitable for a variety of applications ranging from factory automation to automotive systems. The device supports fast and slow mode and has an input range of 0V to 5V. The ADS7810 offers high accuracy, low power consumption and a low cost package.

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