Analog Devices Inc. AD4115BCPZ

Overview

AD4115BCPZ from Analog Devices is a 24-bit sigma-delta ADC with integrated analog front end (AFE), supporting up to 16 single-ended or 8 differential ±10 V inputs, 125 kSPS maximum output data rate, 85 dB 50/60 Hz rejection at 20 SPS, and on-chip 2.5 V reference (±0.12% initial accuracy). It targets high-precision industrial voltage monitoring in PLC analog input modules.

For engineers reviewing the AD4115BCPZ datasheet, AD4115BCPZ pinout, AD4115BCPZ application, or AD4115BCPZ equivalent, key selection factors include its ±10 V bipolar input range, 1 MΩ minimum input impedance, 24-bit no-missing-codes resolution, integrated reference drift (±5 ppm/°C), and 40-lead LFCSP package with AVDD/IOVDD dual-supply flexibility.

Technical Context

The AD4115BCPZ implements a multi-stage digital filter architecture-supporting Sinc5+Sinc1, Sinc3, and enhanced 50/60 Hz rejection modes-with programmable ODR from 2.5 SPS to 125 kSPS per channel. Its internal 8 MHz clock or external crystal (up to 16.384 MHz) drives a precision modulator leveraging iPassives® technology for factory-calibrated linearity.

It features an automatic channel sequencer enabling scan rates up to 24,845 SPS across enabled channels (40.25 µs settling), with independent setup registers for gain, offset, filter, and reference per channel. The AFE includes rail-to-rail reference buffers, VINCOM-referenced single-ended topology, and absolute input tolerance up to ±20 V with ±65 V pin survival rating.

Key Specifications

Pinout & Package

The AD4115BCPZ is housed in a 40-lead, 6 mm × 6 mm LFCSP package with exposed thermal pad soldered to AVSS. Pin functions are validated per Analog Devices Rev. A datasheet (Pages 10–11).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7177-2BRUZ and LTC2499CGN#PBF, the AD4115BCPZ uniquely balances 24-bit precision, ±10 V input capability, 125 kSPS speed, and per-channel configurability - making it optimal for high-channel-count industrial voltage acquisition where both range and flexibility are required.

Availability

AD4115BCPZ is available at Aetrix Electronics and suitable for programmable logic controller (PLC) modules, distributed control system (DCS) I/O cards, and industrial data loggers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD4115BCPZ 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 AD4115BCPZ belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for industrial process control, automation, and test equipment demanding robust ±10 V input handling, high noise immunity, and seamless integration into isolated systems.

FAQ

What is the maximum channel scan rate supported by the AD4115BCPZ?

The AD4115BCPZ achieves a maximum channel scan rate of 24,845 SPS (40.25 µs settling time) when cycling through enabled channels in sequence. This performance is maintained with fully settled data across all configured inputs, enabled by its high-speed digital filter architecture and optimized analog front end. The AD4115BCPZ delivers this scan rate while preserving 24-bit resolution and 85 dB common-mode rejection at 50/60 Hz - essential for real-time industrial monitoring applications.

Does the AD4115BCPZ require an external reference voltage?

No, the AD4115BCPZ integrates a buffered 2.5 V band gap reference with ±0.12% initial accuracy at 25°C and ±5 ppm/°C typical drift, eliminating the need for an external reference in most applications. REFOUT is accessible on Pin 6 and must be decoupled with a 0.1 µF capacitor to AVSS. External references (1 V to AVDD) may be used via REF+ and REF− pins when higher accuracy or custom voltage scaling is required - but the AD4115BCPZ's internal reference meets full specification for TUE ≤0.12% FSR over −40°C to +105°C.

What is the absolute maximum voltage rating for the analog input pins of the AD4115BCPZ?

The AD4115BCPZ analog input pins (VIN0–VIN15) have an absolute maximum rating of ±65 V with respect to AVSS, as specified in Table 3 of the Rev. A datasheet. This ruggedness protects against wiring faults, ESD events, and transient surges in industrial environments. While functional operation is guaranteed up to ±20 V absolute input voltage, the ±65 V survival rating ensures long-term reliability even under abnormal conditions - a critical feature for field-deployed PLC and DCS hardware where maintenance access is limited.

Can the AD4115BCPZ operate with separate analog and digital supply voltages?

Yes, the AD4115BCPZ supports independent analog (AVDD = 4.5 V to 5.5 V) and digital (IOVDD = 2 V to 5.5 V) supplies, enabling true galvanic isolation in system design. AVDD powers the analog core and reference circuitry, while IOVDD supplies the digital interface and GPIOs. This separation allows AVDD to remain at 5 V for optimal analog performance while IOVDD operates at 3.3 V for compatibility with modern microcontrollers - without compromising noise immunity or conversion accuracy. The AD4115BCPZ maintains full specification across this dual-rail configuration.

How does the AD4115BCPZ handle 50 Hz and 60 Hz interference in industrial settings?

The AD4115BCPZ provides simultaneous 50 Hz and 60 Hz rejection at 20 SPS output data rate using its enhanced digital filter mode, achieving 120 dB CMRR. This is implemented in hardware with no software overhead, and the filter characteristics are programmable per channel. At higher ODRs, it maintains 85 dB rejection - sufficient for many factory-floor applications. The AD4115BCPZ's ability to configure rejection independently per channel makes it ideal for mixed-frequency environments (e.g., facilities with both 50 Hz European and 60 Hz North American equipment), ensuring clean measurements without external notch filters.