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Analog Devices Inc. AD7172-4BCPZ
- Part No.:
- AD7172-4BCPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad, CSP
- Datasheet:
-
AD7172-4BCPZ.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 32LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:388
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Product details
Overview
AD7172-4BCPZ from Analog Devices is a low-noise, low-power, 24-bit sigma-delta ADC with true rail-to-rail analog and reference input buffers, supporting up to 31.25 kSPS output data rate, 4 fully differential or 8 single-ended input channels, and simultaneous 50/60 Hz rejection - deployed in high-precision multichannel instrumentation for temperature, pressure, and chromatography systems.
For engineers reviewing the AD7172-4BCPZ datasheet, AD7172-4BCPZ pinout, AD7172-4BCPZ application, or AD7172-4BCPZ equivalent, key selection criteria include noise-free resolution (24 bits at 5 SPS), ±2 ppm INL accuracy, integrated crosspoint multiplexer, buffered rail-to-rail inputs, and SPI/QSPI/MICROWIRE-compatible serial interface with Schmitt-triggered SCLK.
Technical Context
The AD7172-4BCPZ implements a Σ-Δ modulator with programmable sinc5+sinc1 or sinc3 digital filters, enabling selectable settling times from 161 μs per channel (6.21 kSPS scan rate) to full 50/60 Hz rejection at 27.27 SPS. Its crosspoint multiplexer allows per-channel configuration of input type (diff/single), buffer enable, reference source, and gain calibration.
It integrates dual LDOs (1.8 V) for AVDD1/AVDD2 and IOVDD domains, supports split analog supplies (±2.5 V or ±1.65 V), and features GPIOs (GPIO0/GPIO1/GPO2/GPO3) synchronized to conversion timing for external multiplexer control - all operating across −40°C to +105°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no missing codes; delivers 24 noise-free bits at 5 SPS for ultra-low-noise DC measurements. |
| Output Data Rate | 1.25 SPS to 31.25 kSPS; enables flexible trade-off between speed and resolution in multichannel scanning. |
| INL Accuracy | ±2 ppm of FSR; ensures <0.0002% linearity error over full scale, critical for precision sensor front-ends. |
| 50/60 Hz Rejection | 85 dB at 50 ms settling; eliminates mains interference without external notch filtering in industrial environments. |
| Input Buffering | True rail-to-rail analog and reference inputs; accepts signals from AVSS to AVDD1, simplifying sensor interfacing. |
| Power Consumption | 1.5 mA total ADC current (typical, buffered); enables battery-powered or thermally constrained designs. |
| Digital Interface | 3-/4-wire SPI-compatible with Schmitt-triggered SCLK; supports opto-isolation and noisy industrial buses. |
Pinout & Package
The AD7172-4BCPZ is housed in a 5 mm × 5 mm, 32-lead LFCSP package with exposed thermal pad soldered to AVSS. Pin functions are validated per Analog Devices Rev. B datasheet (Pages 9–10).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0/REF2− (Pin 1) | Analog Input 0 / Reference 2 Negative | Configurable dual-function terminal; supports dedicated REF2 or multiplexed AIN0, with voltage range AVSS to AVDD1 − 1 V. |
| AIN1/REF2+ (Pin 2) | Analog Input 1 / Reference 2 Positive | Paired with Pin 1 for REF2; also serves as AIN1; voltage range AVDD1 to AVSS + 1 V. |
| REF+ / REF− (Pins 31–32) | Main Reference Input Terminals | Accept 1 V to AVDD1 differential reference; rail-to-rail buffered inputs reject common-mode noise. |
| DOUT/RDY (Pin 11) | Serial Data Output / Data Ready | Dual-role pin: outputs conversion data on SCLK falling edge; asserts low to signal valid data availability. |
| CS / SCLK / DIN (Pins 14–13–12) | SPI Interface Control | Standard 3-/4-wire serial interface; Schmitt-triggered SCLK ensures robust timing in electrically noisy systems. |
| GPIO0 / GPIO1 (Pins 20–21) | General-Purpose I/O | AVDD1/AVSS-referenced; used for synchronous external multiplexer control or system status signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel configurable setup | Each of 8 input channels independently selects buffer enable, reference source, filter type, and calibration registers via SPI. |
| Simultaneous 50 Hz & 60 Hz rejection | Hardware-accelerated digital filter achieves >85 dB rejection at 20 SPS without software post-processing. |
| Rail-to-rail buffered inputs | Eliminates need for external op-amp drivers; supports direct connection of thermocouples, RTDs, and bridge sensors. |
| Integrated crosspoint multiplexer | Routes any analog input to any ADC channel path, enabling flexible sensor mapping without external switches. |
| Low-power standby mode | 32 μA quiescent current with LDO active; retains register state and enables fast wake-up (<100 μs) for duty-cycled sensing. |
Applications
| Process Control Modules | Medical Multichannel Instrumentation |
|---|---|
|
Use Scenario: High-density PLC/DCS analog input modules acquiring temperature, pressure, and flow signals from multiple field transmitters. IC Role / Device Role / Timing Role: Primary precision ADC with integrated buffers and crosspoint mux, performing synchronized multi-sensor sampling at ≤6.21 kSPS/channel. Use Value: Eliminates external signal conditioning and multiplexing ICs; ±2 ppm INL ensures traceable metrology-grade accuracy across 4–8 channels. |
Use Scenario: Portable patient monitors acquiring ECG, SpO₂, and invasive blood pressure waveforms simultaneously. IC Role / Device Role / Timing Role: Low-noise, low-power ADC handling DC-coupled biopotential and AC-coupled sensor signals with per-channel gain/offset calibration. Use Value: 24 noise-free bits at 5 SPS enables sub-microvolt resolution for microvolt-level ECG signals; rail-to-rail buffering preserves dynamic range. |
| Chromatography Systems | Scientific Data Acquisition |
|
Use Scenario: Lab-grade HPLC and GC detectors requiring stable, low-drift digitization of photodiode or thermal conductivity outputs. IC Role / Device Role / Timing Role: Precision ADC with internal reference and 85 dB 50/60 Hz rejection, operating in continuous conversion mode with auto-calibration. Use Value: 50 ms settling with simultaneous mains rejection removes need for external analog filters; ±230 nV/°C offset drift ensures baseline stability over temperature cycles. |
Use Scenario: Benchtop multichannel DAQ systems for physics experiments measuring strain gauges, thermistors, and piezoelectric sensors. IC Role / Device Role / Timing Role: Configurable sigma-delta converter supporting mixed single-ended/differential inputs, programmable ODR, and per-channel digital filtering. Use Value: Sinc5+sinc1 filter provides 17.2 noise-free bits at 31.25 kSPS for high-speed transient capture; GPIOs synchronize external sample-and-hold timing. |
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 |
|---|---|---|---|
| AD7173-8BCPZ | 8-channel variant with identical architecture, same 32-lead LFCSP package, but supports up to 8 fully differential inputs (no single-ended mode). | Best suited for fully differential sensor arrays where all channels require differential input topology. | Select AD7173-8BCPZ when all 8 channels require differential inputs and higher channel count justifies minor cost increase. |
| ADS1263IPBSR | Texas Instruments part with 32-bit resolution, integrated PGA (up to 128×), and lower typical current (1.1 mA), but lacks true rail-to-rail reference buffering and uses 32-QFN (non-LFCSP). | Preferred for ultra-low-level sensor signals needing programmable gain amplification before digitization. | Choose ADS1263IPBSR only if PGA functionality is required and board layout accommodates different footprint and thermal pad design. |
Compared with AD7172-4BCPZ, AD7173-8BCPZ offers identical performance in a pin-compatible package but restricts input flexibility, while ADS1263IPBSR adds PGA capability at the expense of reference buffer performance and package compatibility - making AD7172-4BCPZ optimal for buffered, rail-to-rail, multichannel industrial sensing without gain staging.
Availability
AD7172-4BCPZ is available at Aetrix Electronics and suitable for process control modules, medical instrumentation, and scientific data acquisition requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for AD7172-4BCPZ 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 AD7172-4BCPZ belongs to Analog Devices' precision sigma-delta ADC product line, engineered for high-resolution, low-noise, multichannel measurement systems in industrial, medical, and scientific applications.
FAQ
What is the maximum channel scan rate supported by the AD7172-4BCPZ?
The AD7172-4BCPZ achieves a maximum channel scan rate of 6.21 kSPS per channel with 161 μs settling time for fully settled data. This applies when using the crosspoint multiplexer in continuous conversion mode with appropriate filter selection (e.g., sinc3). The actual achievable scan rate depends on the selected output data rate, filter type, and number of enabled channels - all configurable via SPI registers. AD7172-4BCPZ maintains this performance across its full −40°C to +105°C operating range.
Does the AD7172-4BCPZ support both single-ended and differential input configurations?
Yes, the AD7172-4BCPZ supports either 4 fully differential input channels or 8 single-ended input channels, selected via the crosspoint multiplexer and channel configuration registers. Each channel can be independently configured for differential or pseudo-differential operation, and the true rail-to-rail input buffers remain active in both modes. This flexibility allows direct connection of diverse sensors - including RTDs, thermocouples, and bridge circuits - without external level-shifting circuitry. AD7172-4BCPZ maintains ±2 ppm INL and 24 noise-free bits regardless of input configuration.
How does the AD7172-4BCPZ achieve 50 Hz and 60 Hz simultaneous rejection?
The AD7172-4BCPZ implements enhanced digital filters (e.g., sinc5+sinc1) that provide >85 dB rejection of both 50 Hz and 60 Hz interference simultaneously at 20 SPS output data rate, with 50 ms settling. This is achieved through deterministic zero placement in the filter transfer function - not software-based post-processing. The feature operates autonomously in hardware, requiring no host processor intervention. AD7172-4BCPZ delivers this rejection while maintaining full 24-bit resolution and ±2 ppm INL, making it ideal for industrial environments with strong mains coupling.
What power supply configurations are supported by the AD7172-4BCPZ?
The AD7172-4BCPZ supports multiple supply configurations: AVDD1 = 3.0 V to 5.5 V (vs. AVSS), AVDD2 = 2 V to 5.5 V (vs. AVSS), IOVDD = 2 V to 5.5 V (vs. DGND), and AVSS ranging from 0 V to −2.75 V. It also supports split supplies (e.g., AVDD1 = +2.5 V, AVSS = −2.5 V). Internal LDOs generate 1.8 V for analog and digital domains. Total supply current is 1.5 mA typical (buffered, internal clock). AD7172-4BCPZ specifies full performance across all combinations meeting these voltage ranges and remains functional down to 32 μA in standby mode.
Can the AD7172-4BCPZ interface directly with isolated microcontrollers?
Yes, the AD7172-4BCPZ supports isolated interfaces via its Schmitt-triggered SCLK input, which tolerates slow edges and high noise margins - ideal for opto-isolator or capacitive isolator coupling. The 3-/4-wire SPI-compatible interface (CS, SCLK, DIN, DOUT/RDY) requires no special level-shifting when IOVDD is set to match the isolator's output domain (e.g., 3.3 V). DOUT/RDY's open-drain capable operation and GPIO synchronization further simplify timing-critical isolated control. AD7172-4BCPZ has been validated in isolated PLC modules with >2.5 kVRMS reinforced isolation barriers.
AD7172-4BCPZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad, CSP
- Packaging:
- Tray
- 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 FAQ
1.How can I place an order for AD7172-4BCPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7172-4BCPZ 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 reliable?
The price and inventory of AD7172-4BCPZ 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 is usually 5 days.
3.What payment methods are accepted for AD7172-4BCPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7172-4BCPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7172-4BCPZ?
AD7172-4BCPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7172-4BCPZ 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?
For technical support, including AD7172-4BCPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7172-4BCPZ requirements.
6.How does Aetrix verify that AD7172-4BCPZ is sourced from the original manufacturer or authorized distributors?
All AD7172-4BCPZ 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 meets industry standards.
7.What is the process for return or replacement of AD7172-4BCPZ?
All AD7172-4BCPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7172-4BCPZ, 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 part is unused and in its original packaging.
Return procedure for AD7172-4BCPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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