Analog Devices Inc. AD7193BCPZ

Overview

AD7193BCPZ from Analog Devices is a 24-bit sigma-delta ADC with integrated PGA, designed for high-precision analog front-end acquisition in industrial measurement systems. It delivers 11 nV RMS noise at 4.7 Hz (gain = 128), supports up to 4.8 kHz output data rate, and features four differential or eight pseudo-differential input channels - enabling direct interface with low-level transducers such as strain gauges and RTDs.

For engineers reviewing the AD7193BCPZ datasheet, AD7193BCPZ pinout, AD7193BCPZ application, or AD7193BCPZ equivalent, key selection criteria include its simultaneous 50/60 Hz rejection capability, programmable gain (1–128), on-chip channel sequencer, and dual supply operation (AVDD: 3–5.25 V, DVDD: 2.7–5.25 V) for mixed-signal system integration.

Technical Context

The AD7193BCPZ implements a fully integrated Σ-Δ modulator with digital filter options including Sinc4, Sinc3, and fast-settling modes - each supporting configurable notch placement for simultaneous 50 Hz and 60 Hz line rejection. Its on-chip PGA provides gain from 1 to 128 with ±1 ppm/°C gain drift and ±5 nV/°C offset drift, ensuring stable performance across −40°C to +105°C.

Digital interface compliance includes SPI, QSPI™, and MICROWIRE™ protocols with Schmitt-triggered SCLK for noise immunity. The device integrates four general-purpose digital outputs (P0–P3), a temperature sensor (±2°C accuracy), and bridge power-down switch (RON = 10 Ω), all controllable via dedicated registers over a 3-wire serial interface.

Key Specifications

Pinout & Package

AD7193BCPZ is available in a 32-lead LFCSP package (5 mm × 5 mm, 0.5 mm pitch), optimized for thermal performance (θJA = 32.5°C/W) and board space efficiency in dense industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision sigma-delta ADC applications.

Compared with AD7193BCPZ, AD7173-8BCPZ offers higher resolution but removes PGA flexibility and increases power, while ADS1258IRTCT trades built-in 50/60 Hz rejection for raw speed - making AD7193BCPZ optimal for cost-sensitive, noise-immune industrial DAQ where transducer-level gain and robustness are prioritized.

Availability

AD7193BCPZ is available at Aetrix Electronics and suitable for PLC/DCS analog input modules, weigh scale electronics, and medical pressure sensing systems requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for AD7193BCPZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7193BCPZ belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for high-accuracy industrial and scientific measurement where low noise, low drift, and integrated signal conditioning are mandatory.

FAQ

What is the maximum achievable noise-free resolution of the AD7193BCPZ?

The AD7193BCPZ achieves up to 22 noise-free bits at DC with gain = 1, verified per the datasheet's RMS noise and resolution characterization. This corresponds to ~4.2 µV peak-to-peak noise on a 5 V full-scale range. At 2.4 kHz output data rate and gain = 128, it delivers 15.5 noise-free bits - sufficient for 16-bit-equivalent dynamic performance in high-speed weighing or flow metering applications. The AD7193BCPZ specification sheet confirms this across temperature and supply variations.

Does the AD7193BCPZ support true 4-wire differential measurements across all eight input channels?

No - the AD7193BCPZ supports four true differential input pairs (AIN1–AIN2, AIN3–AIN4, AIN5–AIN6, AIN7–AIN8), each with independent common-mode rejection. The remaining four channels operate in pseudo-differential mode referenced to AINCOM. This architecture allows flexible configuration: e.g., four load cells (differential) plus four thermocouples (pseudo-diff), all managed by the on-chip channel sequencer. The AD7193BCPZ pinout and configuration register definitions strictly enforce this 4-diff / 8-pseudo-diff mapping.

Can the AD7193BCPZ operate with only a single power supply rail?

No - the AD7193BCPZ requires two independent supplies: AVDD (3–5.25 V) for analog circuitry and DVDD (2.7–5.25 V) for digital logic. They may be set to the same voltage (e.g., both at 3.3 V), but must be decoupled separately and referenced to their respective ground planes (AGND and DGND). The absolute maximum rating specifies AGND–DGND differential ≤ ±0.3 V, confirming strict separation. This dual-rail design is fundamental to the AD7193BCPZ's 120 dB CMRR and noise performance.

How does the AD7193BCPZ implement simultaneous 50 Hz and 60 Hz rejection?

The AD7193BCPZ achieves simultaneous 50/60 Hz rejection by configuring its Sinc4 or Sinc3 digital filter with REJ60 = 1 in the mode register - which places notches at both frequencies when the first filter notch is aligned to 50 Hz. This is hardware-accelerated and requires no firmware intervention. Measured rejection exceeds 120 dB at both frequencies under specified conditions (e.g., 10 Hz ODR), as validated in the AD7193BCPZ datasheet's normal-mode rejection tables and confirmed in application note AN-1084.

Is the internal temperature sensor in the AD7193BCPZ calibrated at the factory?

The AD7193BCPZ internal temperature sensor is not factory-calibrated; its accuracy is specified as ±2°C after user calibration at 25°C. The sensor outputs 2815 codes/°C in bipolar mode, and users must perform a single-point calibration (e.g., at ambient room temperature) to correct for part-to-part offset. This calibration is implemented via the offset register and is documented in the AD7193BCPZ's temperature sensor section (page 39) and register map (page 29).