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Analog Devices Inc. AD7172-4BCPZ-RL
- Part No.:
- AD7172-4BCPZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad, CSP
- Datasheet:
-
AD7172-4BCPZ-RL.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 32LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,663
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Product details
Overview
AD7172-4BCPZ-RL from Analog Devices is a low-power, 24-bit sigma-delta ADC with true rail-to-rail analog and reference input buffers, 4 fully differential or 8 single-ended input channels, 31.25 kSPS maximum output data rate, and ±2 ppm INL over full scale. It delivers 24 noise-free bits at 5 SPS and supports simultaneous 50 Hz/60 Hz rejection for precision industrial sensing in PLC/DCS modules.
For engineers reviewing the AD7172-4BCPZ-RL datasheet, AD7172-4BCPZ-RL pinout, AD7172-4BCPZ-RL application, or AD7172-4BCPZ-RL equivalent, key selection considerations include channel scan settling time (161 μs), buffered input impedance (>1 TΩ), internal/external clock flexibility, SPI/QSPI/MICROWIRE compatibility, and −40°C to +105°C operation with split-supply support (±2.5 V or ±1.65 V).
Technical Context
The AD7172-4BCPZ-RL integrates a crosspoint multiplexer enabling per-channel configuration of input type (diff/single), buffer enable, reference source, and digital filter selection via SPI registers. Its sinc5+sinc1 and sinc3 filter options provide programmable trade-offs between settling time, noise, and 50/60 Hz rejection-e.g., 85 dB rejection at 50 ms settling.
Digital features include per-channel offset/gain calibration registers, GPIO-controlled external multiplexer synchronization, DOUT/RDY interrupt signaling, and checksum/CRC protection on serial communications. The device uses an internal 2 MHz oscillator or accepts 14–16.384 MHz crystal/external clock, with Schmitt-triggered SCLK supporting opto-isolated interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no missing codes; usable resolution up to 24 noise-free bits at 5 SPS |
| Output Data Rate | 1.25 SPS to 31.25 kSPS; supports fast channel scanning at 6.21 kSPS/channel (161 μs settling) |
| INL Error | ±2 ppm of FSR - enables high-accuracy measurement without system-level trimming |
| Power Supply | AVDD1 = 3.0–5.5 V, AVDD2/IOVDD = 2–5.5 V, AVSS = 0 V or −2.5 V; supports split supplies |
| Input Buffers | True rail-to-rail analog and reference inputs; input current ≤ ±5.5 nA when enabled |
| Rejection Performance | 85 dB 50/60 Hz rejection at 20 SPS post-filter; 120 dB at DC common-mode |
| Operating Temp | −40°C to +105°C - qualified for industrial and extended-temperature embedded systems |
Pinout & Package
The AD7172-4BCPZ-RL is housed in a 5 mm × 5 mm, 32-lead LFCSP package with exposed pad soldered to AVSS for thermal and mechanical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0/REF2−, AIN1/REF2+, REF+, REF− | Analog input/reference terminals | Support dual reference sources (REF1, REF2); enable true rail-to-rail buffered inputs from AVSS to AVDD1 |
| AIN2–AIN8 | Additional analog inputs | Expand channel count to 8 single-ended or 4 fully differential inputs via crosspoint mux |
| SCLK, DIN, DOUT/RDY, CS | SPI-compatible serial interface | Schmitt-triggered SCLK allows noise-immune opto-isolation; DOUT/RDY serves as data-ready interrupt |
| GPIO0, GPIO1, GPO2, GPO3 | General-purpose I/O | Synchronize external analog multiplexers to ADC conversion timing; referenced to AVDD1/AVSS |
| XTAL1, XTAL2/CLKIO | Clock source interface | Accepts 14–16.384 MHz crystal or 2–2.048 MHz external clock; internal 2 MHz oscillator available |
| ERROR, SYNC | System coordination signals | ERROR pin supports open-drain error bus wiring across multiple AD7172-4 devices; SYNC enables multi-device filter synchronization |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel configuration | Independent setup for input type, buffer enable, reference selection, and filter mode via SPI-accessible registers |
| Simultaneous 50/60 Hz rejection | Hardware-accelerated digital filtering achieves 85 dB rejection at 20 SPS without firmware overhead |
| Rail-to-rail buffered inputs | Input impedance >1 TΩ with ±5.5 nA bias current enables direct connection to high-Z sensors (e.g., RTDs, thermocouples) |
| Low power operation | 1.5 mA total ADC current in full operating mode; 32 μA in standby; 1–10 μA in full power-down |
| Robust serial interface | CRC/checksum protection, Schmitt-triggered SCLK, and tristatable DOUT/RDY simplify reliable communication in noisy environments |
Applications
| Process Control Modules | Medical Instrumentation |
|---|---|
Use Scenario: High-density analog input in PLC/DCS backplanes requiring simultaneous acquisition from 4–8 temperature/pressure transducers. IC Role / Device Role / Timing Role: Primary sigma-delta ADC performing synchronized channel scanning with 161 μs per-channel settling and integrated 50/60 Hz line rejection. Use Value: Eliminates need for external anti-aliasing filters and software-based notch filtering, reducing BOM cost and firmware complexity. | Use Scenario: Multi-sensor physiological monitoring in portable ECG or patient vital sign analyzers. IC Role / Device Role / Timing Role: Precision front-end digitizer for low-level biopotential signals with rail-to-rail buffered inputs and 24 noise-free bits at 5 SPS. Use Value: Enables direct connection to dry electrodes and high-impedance sensor nodes without signal degradation or external op-amp buffering. |
| Chromatography Systems | Scientific Multichannel Loggers |
Use Scenario: Acquisition of detector outputs in gas/liquid chromatographs where low drift and high linearity are critical for peak integration accuracy. IC Role / Device Role / Timing Role: Low-drift ADC with ±2 ppm INL and <±230 nV/°C offset drift, operating in continuous conversion mode with per-channel gain calibration. Use Value: Maintains calibration stability across thermal cycles, reducing recalibration frequency and improving long-term measurement repeatability. | Use Scenario: Environmental data loggers capturing temperature, humidity, and strain from distributed sensor arrays over extended periods. IC Role / Device Role / Timing Role: Low-power ADC running in standby mode between acquisitions, waking on timer or GPIO trigger to capture 24-bit samples at configurable ODRs down to 1.25 SPS. Use Value: Achieves >10-year battery life in remote deployments while preserving full 24-bit resolution at ultra-low sampling rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7175-2BRUZ | 2-channel, 32 kSPS, 24-bit, same architecture but fewer inputs and no crosspoint mux | Limited to dual-input systems; lacks GPIO-controlled external mux sync and per-channel filter selection | Choose when channel count and feature set can be reduced to lower cost and board space |
| ADS127L01IPBSR | Texas Instruments part: 1-channel, 400 kSPS, 24-bit, different filter architecture (asynchronous sigma-delta), no integrated buffers | Requires external op-amps for rail-to-rail input; higher speed but less integrated signal conditioning | Prefer when single-channel throughput >31.25 kSPS is required and external buffering is acceptable |
Compared with AD7172-4BCPZ-RL, AD7175-2BRUZ reduces channel flexibility and system integration, while ADS127L01IPBSR trades integrated buffers and multi-channel synchronization for raw speed-making AD7172-4BCPZ-RL optimal for compact, multi-sensor industrial and scientific systems demanding low drift, high linearity, and minimal external components.
Availability
AD7172-4BCPZ-RL is available at Aetrix Electronics and suitable for process control modules, medical instrumentation, and scientific multichannel loggers requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for AD7172-4BCPZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The AD7172-4BCPZ-RL belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for high-resolution, low-drift, multi-channel data acquisition in harsh industrial and scientific environments.
FAQ
What is the maximum channel scan rate supported by the AD7172-4BCPZ-RL?
The AD7172-4BCPZ-RL achieves a maximum channel scan data rate of 6.21 kSPS per channel, with 161 μs settling time for fully settled data. This performance is enabled by its integrated crosspoint multiplexer and optimized digital filter architecture, allowing rapid switching between up to eight single-ended or four fully differential inputs without external hardware reconfiguration. The AD7172-4BCPZ-RL maintains this rate across its full operating temperature range of −40°C to +105°C.
Does the AD7172-4BCPZ-RL require external op-amps for sensor interfacing?
No, the AD7172-4BCPZ-RL includes true rail-to-rail analog input buffers with input bias current ≤ ±5.5 nA and input impedance >1 TΩ when enabled-eliminating the need for external op-amps when interfacing with high-impedance sensors such as RTDs, thermocouples, or piezoresistive bridges. These buffers accept inputs from AVSS to AVDD1 and support both single-ended and fully differential configurations directly. The AD7172-4BCPZ-RL also provides buffered reference inputs with similar specifications.
How does the AD7172-4BCPZ-RL handle 50 Hz and 60 Hz interference rejection?
The AD7172-4BCPZ-RL implements hardware-accelerated digital filtering that delivers simultaneous 50 Hz and 60 Hz rejection of up to 85 dB at 20 SPS output data rate, with 50 ms settling time. Its enhanced sinc5+sinc1 and sinc3 filter options allow users to select rejection profiles optimized for specific line frequencies and settling requirements. Unlike software-based solutions, this rejection is performed in real time within the ADC's digital filter block, requiring no host processor intervention. The AD7172-4BCPZ-RL maintains this performance across all input configurations and temperature ranges.
Can the AD7172-4BCPZ-RL operate with split analog supplies?
Yes, the AD7172-4BCPZ-RL supports split analog supplies: AVDD1 and AVSS can be configured at ±2.5 V or ±1.65 V, enabling bipolar signal acquisition without level-shifting circuitry. AVDD2 and IOVDD remain independent and operate from 2 V to 5.5 V relative to DGND. This dual-supply capability allows direct digitization of ±2.5 V or ±1.65 V input ranges while maintaining digital interface compatibility with standard 1.8 V, 3.3 V, or 5 V logic levels. The AD7172-4BCPZ-RL specifies full performance across these configurations.
What serial interface protocols does the AD7172-4BCPZ-RL support?
The AD7172-4BCPZ-RL supports SPI, QSPI, MICROWIRE, and DSP-compatible serial interfaces using a 3- or 4-wire configuration (CS, SCLK, DIN, DOUT/RDY). Its SCLK input includes a Schmitt trigger for noise immunity, making it suitable for opto-isolated or electrically noisy industrial environments. The DOUT/RDY pin functions as both a data output and a ready/interrupt signal, simplifying host processor synchronization. All register reads/writes use standard SPI framing, and CRC/checksum protection ensures data integrity. The AD7172-4BCPZ-RL requires no protocol translation or custom drivers.
AD7172-4BCPZ-RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 31.25k
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2V ~ 5.5V
- Voltage - Supply, Digital:
- 2V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 32-LFCSP (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7172-4BCPZ-RL FAQ
1.How can I place an order for AD7172-4BCPZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7172-4BCPZ-RL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD7172-4BCPZ-RL reliable?
The price and inventory of AD7172-4BCPZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7172-4BCPZ-RL is usually 5 days.
3.What payment methods are accepted for AD7172-4BCPZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7172-4BCPZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7172-4BCPZ-RL?
AD7172-4BCPZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7172-4BCPZ-RL order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD7172-4BCPZ-RL?
For technical support, including AD7172-4BCPZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7172-4BCPZ-RL requirements.
6.How does Aetrix verify that AD7172-4BCPZ-RL is sourced from the original manufacturer or authorized distributors?
All AD7172-4BCPZ-RL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD7172-4BCPZ-RL meets industry standards.
7.What is the process for return or replacement of AD7172-4BCPZ-RL?
All AD7172-4BCPZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with AD7172-4BCPZ-RL, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD7172-4BCPZ-RL part is unused and in its original packaging.
Return procedure for AD7172-4BCPZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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