AD7193BCPZ-RL7 Features, Pinout, Applications, and Compatible Components

The AD7193BCPZ-RL7 by Analog Devices is an ultra-low noise, high-precision 24-bit Sigma-Delta Analog-to-Digital Converter (ADC) designed for high accuracy and versatility in applications that require precise signal conversion. With features such as a programmable gain amplifier (PGA) that can scale from 1 to 128, selectable filter options, and an ultra-low RMS noise performance of 11 nV at low frequencies (4.7 Hz), this ADC is well-suited for industrial and scientific measurement systems. It has a flexible input configuration, supporting up to four fully differential or eight pseudo-differential input channels. The AD7193 also offers both internal and external clock options and is compatible with various serial communication protocols, making it highly adaptable to diverse system architectures.

Key Features of the AD7193BCPZ-RL7

· High-Resolution Performance: With a 24-bit Sigma-Delta architecture, the AD7193 achieves up to 22 noise-free bits, making it ideal for applications requiring extremely low noise and high accuracy.

· Programmable Gain Amplifier: Gain settings from 1 to 128, allowing direct interfacing with low-level signals such as strain gauges and temperature sensors.

· Flexible Filter Options: Supports Sinc3 and Sinc4 filters, zero latency, and fast settling modes, enabling configurable data output rates from 4.7 Hz to 4.8 kHz to balance speed and resolution.

· Multi-Channel Capability: Provides up to eight pseudo-differential or four differential input channels, selectable through an internal channel sequencer for automatic sequential conversions.

· Low Drift and High Stability: Offset and gain drift are minimized, with typical values of ±5 nV/°C and ±1 ppm/°C respectively, ensuring long-term measurement stability.

· Power Efficiency: Operates at a supply voltage range of 3 V to 5.25 V and consumes just 4.65 mA, optimizing power efficiency for embedded and portable systems.

Pinout Overview

VDD (Pin 1) – Positive power supply.

AGND (Pin 2) – Analog ground.

DVDD (Pin 3) – Digital power supply.

DGND (Pin 4) – Digital ground.

SDO (Pin 6) – SPI serial data output.

SDI (Pin 7) – SPI serial data input.

SCK (Pin 8) – SPI clock input.

CS (Pin 9) – Chip select.

REF+ (Pin 10) – Positive reference input.

REF- (Pin 11) – Negative reference input.

AIN+ (Pin 12) – Analog input (positive).

AIN- (Pin 13) – Analog input (negative).

Application Scenarios

The AD7193BCPZ-RL7 is designed for applications that demand high precision and stability, including:

· Industrial and Process Control: Ideal for PLC/DCS analog input modules, flow measurement, and temperature measurement where accurate and stable data conversion is crucial.

· Scientific and Medical Instrumentation: Suitable for weigh scales, chromatography, and other precision measurement tools, especially where low noise and high resolution are needed.

· Sensor Interfacing: Works well with strain gauge transducers and pressure sensors, benefiting from the ADC’s programmable gain and low noise performance.

Compatible Electronic Components

To enhance the functionality of the AD7193BCPZ-RL7, the following electronic component series are recommended. Each complements the ADC's performance, expanding its capabilities in various applications:

Analog Devices AD8221 Instrumentation Amplifier

· Category: Instrumentation Amplifier

· Parameter Values: Gain bandwidth product of 10 MHz, gain range from 1 to 1000

· Applications: Used in applications requiring low noise and high precision, like strain gauges and thermocouples.

· Recommended Model: AD8221ARZ

· Description: High-performance instrumentation amplifier ideal for sensor signal conditioning before ADC input to AD7193.

Texas Instruments REF5025 Precision Voltage Reference

· Category: Voltage Reference

· Parameter Values: 2.5V output, temperature coefficient of 3 ppm/°C, initial accuracy of ±0.05%

· Applications: Voltage reference for ADC to improve stability and accuracy, especially in temperature-sensitive applications.

· Recommended Model: REF5025AID

· Description: Precision reference voltage source that ensures stable input for AD7193, enhancing its accuracy across varying environmental conditions.

Murata NFM21PC Series EMI Suppression Filter

· Category: EMI Suppression Filter

· Parameter Values: 100 kOhms impedance at 10 MHz, 100 pF capacitance

· Applications: Reduces electromagnetic interference (EMI) in signal paths, beneficial for high-precision measurements.

· Recommended Model: NFM21PC104R1C3D

· Description: EMI suppression filter that ensures clean signal paths for high-fidelity data acquisition with AD7193.

Texas Instruments OPA211 Low Noise Operational Amplifier

· Category: Operational Amplifier

· Parameter Values: Noise density of 1.1 nV/√Hz, bandwidth of 80 MHz

· Applications: Pre-amplification in signal paths, such as in pressure measurement systems, to drive AD7193 input channels.

· Recommended Model: OPA211ID

· Description: High-precision operational amplifier suitable for amplifying small signals for AD7193, optimizing accuracy in low-level signal applications.

Maxim Integrated MAX3223E RS-232 Line Driver/Receiver

· Category: RS-232 Transceiver

· Parameter Values: Operates with a 3V to 5.5V supply, low supply current of 1 µA in shutdown mode

· Applications: Useful for interfacing AD7193’s SPI or serial interface in systems requiring RS-232 communication.

· Recommended Model: MAX3223EEUE+

· Description: RS-232 line driver/receiver for serial communication, making AD7193 suitable for broader system integration and communication.