Analog Devices Inc. AD7175-8BCPZ-RL

Overview

AD7175-8BCPZ-RL from Analog Devices is a 24-bit, sigma-delta analog-to-digital converter with true rail-to-rail input buffers, 8 fully differential or 16 single-ended input channels, 250 kSPS maximum output data rate, and integrated 2.5 V ±2 ppm/°C reference - designed for high-precision multichannel industrial measurement systems including PLC/DCS modules and chromatography instrumentation.

For engineers reviewing the AD7175-8BCPZ-RL datasheet, AD7175-8BCPZ-RL pinout, AD7175-8BCPZ-RL application, or AD7175-8BCPZ-RL equivalent, key selection criteria include noise-free resolution at multiple ODRs (17.2 bits @ 250 kSPS), 50/60 Hz simultaneous rejection, per-channel configurable filters and calibration, and LFCSP-40 package compatibility with high-density PCB layouts.

Technical Context

The AD7175-8BCPZ-RL implements a sinc5 + sinc1 digital filter architecture enabling single-cycle settling at 50 kSPS/channel (20 µs), and supports simultaneous 50 Hz and 60 Hz rejection at 27.27 SPS via enhanced notch filtering. Its crosspoint multiplexer allows arbitrary routing of any analog input to either ADC path, with independent buffer enable/disable per channel.

It integrates dual LDOs (for analog and digital domains), an internal temperature sensor (±2°C accuracy post-calibration), four GPIOs (two inputs/outputs, two outputs), and programmable burnout currents (±10 µA) - all configurable per channel via 48+ registers accessible over SPI-compatible 3-/4-wire interface with CRC and checksum protection.

Key Specifications

Pinout & Package

The AD7175-8BCPZ-RL is housed in a 40-lead, 6 mm × 6 mm LFCSP package with exposed thermal pad soldered to AVSS. Pin count, layout, and thermal vias align with JEDEC 4-layer board standards (θJA = 54°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7175-8BCPZ-RL, AD7177-2BRUZ trades channel flexibility and scan speed for higher resolution in compact form, while ADS131M08IPBSR reduces integration to lower unit cost at the expense of design effort and thermal drift management.

Availability

AD7175-8BCPZ-RL is available at Aetrix Electronics and suitable for process control, medical instrumentation, and analytical equipment requiring stable component supply, long-lifecycle assurance, and guaranteed traceability for ISO 13485 and IEC 61508 compliance.

Supply support for AD7175-8BCPZ-RL 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, with R&D and manufacturing facilities worldwide.

The AD7175-8BCPZ-RL belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for high-channel-count, low-drift industrial and scientific data acquisition where noise, linearity, and long-term stability are non-negotiable.

FAQ

What is the maximum channel scan rate supported by the AD7175-8BCPZ-RL?

The AD7175-8BCPZ-RL achieves a maximum channel scan rate of 50 kSPS per channel with full settling in 20 µs. This is enabled by its sinc5 + sinc1 filter architecture and crosspoint multiplexer, allowing rapid sequential acquisition across all 16 single-ended or 8 differential inputs without inter-channel crosstalk degradation.

Does the AD7175-8BCPZ-RL require an external reference, or does it include one?

The AD7175-8BCPZ-RL integrates a precision 2.5 V band gap reference with ±2 ppm/°C drift (0°C to 105°C) and buffered REFOUT pin. It supports both internal reference operation and external reference inputs (REF+/REF− or AIN0/REF2−/AIN1/REF2+) - eliminating external reference ICs in most applications unless tighter initial accuracy or different voltage is needed.

Can the AD7175-8BCPZ-RL interface directly with RTD or thermistor sensors?

Yes - the AD7175-8BCPZ-RL supports direct RTD/thermistor interfacing via its true rail-to-rail input buffers (enabling 0 V to AVDD1 common-mode range) and configurable ±10 µA burnout current sources. Combined with per-channel offset/gain calibration and 24 noise-free bits at low ODRs, it forms a complete sensor front-end without external amplifiers or excitation circuitry.

What digital interface protocols does the AD7175-8BCPZ-RL support?

The AD7175-8BCPZ-RL supports standard SPI-compatible 3-wire (CS, SCLK, DOUT/RDY) and 4-wire (CS, SCLK, DIN, DOUT/RDY) serial interfaces. It is also compatible with QSPI, MICROWIRE, and DSP interfaces. Its Schmitt-triggered SCLK input enables robust communication in electrically noisy industrial environments and supports opto-isolation.

How does the AD7175-8BCPZ-RL handle 50 Hz and 60 Hz interference in industrial settings?

The AD7175-8BCPZ-RL provides simultaneous 50 Hz and 60 Hz rejection exceeding 85 dB at 50 ms settling, using an enhanced digital filter mode activated at 27.27 SPS output data rate. This capability is hardware-accelerated and requires no host processor intervention - critical for reliable operation in globally deployed equipment subject to dual-line-frequency noise.