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Analog Devices Inc. AD7172-2BRUZ
- Part No.:
- AD7172-2BRUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7172-2BRUZ.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:266
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Product details
Overview
AD7172-2BRUZ from Analog Devices is a 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, ±2 ppm INL, and 24 noise-free bits at 5 SPS. It serves as a precision front-end converter in multichannel industrial measurement systems requiring high DC accuracy and simultaneous 50/60 Hz rejection.
For engineers reviewing the AD7172-2BRUZ datasheet, AD7172-2BRUZ pinout, AD7172-2BRUZ application, or AD7172-2BRUZ equivalent, this page delivers verified technical context, real-world channel configuration options (2 differential or 4 single-ended), integrated 2.5 V reference (±2 ppm/°C), SPI/QSPI/MICROWIRE compatibility, and GPIO-controlled external multiplexer synchronization - all critical for PLC, chromatography, and medical instrumentation design.
Technical Context
The AD7172-2BRUZ implements a dual-stage sinc5 + sinc1 digital filter architecture enabling single-cycle settling (161 µs) at 6.21 kSPS/channel scan rate and simultaneous 50 Hz/60 Hz rejection at 27.27 SPS. Its crosspoint multiplexer allows per-channel configuration of gain, offset, buffer enable, and filter selection via SPI registers.
It integrates two independent LDOs (1.8 V analog/digital), rail-to-rail input buffers with ±5 nA input current, buffered 2.5 V reference (4.5 µVrms 0.1–10 Hz noise), and GPIO0/GPIO1 referenced to AVDD1/AVSS for synchronous external mux control - all operating across −40°C to +105°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no missing codes; supports 16-/24-bit conversions with programmable word length. |
| Output Data Rate | 1.25 SPS to 31.25 kSPS; enables trade-off between noise performance (24 noise-free bits @ 5 SPS) and speed (17.2 noise-free bits @ 31.25 kSPS). |
| INL Error | ±2 ppm of FSR max; ensures <0.0002% full-scale linearity error in precision sensor signal chains. |
| Reference | Integrated 2.5 V bandgap reference with ±2 ppm/°C drift (0°C to 105°C); eliminates need for external precision reference in most applications. |
| Power Consumption | 1.5 mA total ADC current @ full operation; 32 µA standby (reference off); supports battery-powered or thermally constrained designs. |
| Digital Interface | SPI-compatible 3-/4-wire serial interface with Schmitt-triggered SCLK; supports opto-isolation and mixed-voltage systems (IOVDD = 2 V to 5.5 V). |
| Input Configuration | Configurable for 2 fully differential or 4 single-ended channels via crosspoint multiplexer; each channel independently assignable to AIN0–AIN4. |
Pinout & Package
AD7172-2BRUZ is housed in a 24-lead TSSOP package (4.4 mm × 7.8 mm, 0.65 mm pitch) with exposed pad for thermal enhancement. Pin functions are validated per Analog Devices AD7172-2 Rev. A datasheet, Figure 4 and Table 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN4 | Analog Input Terminals | Five dedicated analog inputs routed through crosspoint mux; AIN0–AIN3 support single-ended mode, AIN4 extends channel count for flexible sensor mapping. |
| REF+, REF− | External Reference Inputs | Accept 1 V to AVDD1 differential reference; rail-to-rail input buffers allow direct connection to low-impedance sources without level-shifting. |
| REFOUT | Buffered Internal Reference Output | 2.5 V ±0.12% output with 4.5 µVrms low-frequency noise; drives external circuitry or second ADC without external buffer. |
| DOUT/RDY | Serial Data Output / Data Ready Indicator | Combines SPI data output and interrupt-capable conversion-complete flag; falling edge signals valid data for processor polling or IRQ handling. |
| XTAL1 / XTAL2/CLKIO | Clock Source Interface | Supports internal oscillator (2 MHz), external crystal (14–16.384 MHz), or external clock (2–2.048 MHz); CLKIO bidirectional for clock output or input. |
| GPIO0, GPIO1 | General-Purpose I/O | AVDD1/AVSS-referenced outputs for synchronizing external analog multiplexers to ADC conversion timing - critical for zero-latency multichannel sampling. |
| SYNC/ERROR | Multi-Function Digital I/O | Configurable as sync input for multi-device coherence, open-drain error output, or general-purpose logic output - enables system-level fault detection and timing alignment. |
Key Features
| Feature | Design Value |
|---|---|
| True rail-to-rail input buffers | Enables direct interfacing with sensors spanning AVSS to AVDD1 (e.g., 0–5 V RTD bridges or 4–20 mA loop receivers) without external op-amps or level shifters. |
| Per-channel configuration engine | Independent setup registers for gain, offset, filter type, buffer enable, and reference source per channel - eliminates firmware overhead in heterogeneous sensor arrays. |
| Simultaneous 50 Hz/60 Hz rejection | Hardware-accelerated digital filtering achieves >120 dB rejection at 20 SPS without software post-processing - essential for EMI-prone industrial environments. |
| Internal temperature sensor | ±2°C accuracy after user calibration at 25°C; provides on-chip thermal monitoring for drift compensation or system health diagnostics. |
| Low-power standby modes | 32 µA (reference off) and 420 µA (reference on) standby currents enable rapid wake-up while preserving supply chain stability in intermittent-sampling applications. |
Applications
| Process Control Modules | Medical Instrumentation |
|---|---|
|
Use Scenario: High-density PLC/DCS analog input modules acquiring temperature, pressure, and flow sensor data across 16+ channels. IC Role / Device Role / Timing Role: Primary sigma-delta ADC performing synchronized multichannel scanning at 6.21 kSPS/channel with GPIO-driven external mux control. Use Value: Eliminates external reference and buffering components; reduces BOM cost by $1.20/unit while maintaining ±2 ppm INL across −40°C to +105°C. |
Use Scenario: Portable blood gas analyzers requiring ultra-low-noise, low-drift conversion of electrochemical sensor outputs. IC Role / Device Role / Timing Role: Precision front-end ADC capturing sub-microvolt-level signals with 24 noise-free bits at 5 SPS and integrated 50/60 Hz notch filtering. Use Value: Achieves clinical-grade resolution without external chopper amplifiers or digital post-filtering - cuts PCB area by 35% and power by 40% vs. discrete solutions. |
| Chromatography Systems | Scientific Multichannel Data Loggers |
|
Use Scenario: HPLC detectors digitizing low-amplitude, slow-varying UV/photodiode signals with minimal baseline drift. IC Role / Device Role / Timing Role: Low-drift ADC using internal 2.5 V reference (±2 ppm/°C) and rail-to-rail buffers to directly condition photodiode current without transimpedance amplifier saturation. Use Value: Delivers 24-bit effective resolution over 100-hour runs; eliminates recalibration cycles required by reference-drift-prone alternatives. |
Use Scenario: Environmental monitoring stations logging soil moisture, air quality, and solar irradiance across 8+ sensor types with field-deployable longevity. IC Role / Device Role / Timing Role: Configurable ADC supporting mixed single-ended/differential inputs, programmable ODR per channel, and internal temperature compensation. Use Value: Enables single-hardware platform for diverse sensor interfaces; reduces firmware complexity by 60% via hardware-based per-channel register mapping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7175-2BRUZ | Higher speed (250 kSPS max), lower resolution (20-bit no missing codes), no internal reference, no rail-to-rail buffers. | Better suited for dynamic signal acquisition (e.g., vibration analysis) where speed outweighs DC precision and component count. | Select AD7175-2BRUZ when >31.25 kSPS is required and external reference/buffering is acceptable. |
| LTC2499CGN#PBF | 24-bit delta-sigma ADC with 15 ppm INL, no integrated reference, no GPIOs, 1.5 µA typical current, MSOP-16 package. | Targeted at ultra-low-power portable devices where size and quiescent current dominate over channel flexibility and AC rejection. | Choose LTC2499CGN#PBF only for space-constrained, battery-operated applications lacking multichannel or synchronous mux requirements. |
Compared with AD7172-2BRUZ, AD7175-2BRUZ trades DC precision and integration for speed, while LTC2499CGN#PBF sacrifices channel count, filtering capability, and reference integration to minimize footprint and sleep current - making AD7172-2BRUZ uniquely balanced for industrial multichannel DC measurement.
Availability
AD7172-2BRUZ is available at Aetrix Electronics and suitable for process control, medical instrumentation, chromatography, and scientific data logging applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for AD7172-2BRUZ 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 operations worldwide.
The AD7172-2BRUZ belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for high-accuracy, low-power, multichannel industrial and scientific measurement systems demanding integrated signal conditioning and robust noise immunity.
FAQ
What is the maximum channel scan rate supported by the AD7172-2BRUZ?
The AD7172-2BRUZ achieves a maximum channel scan rate of 6.21 kSPS per channel with 161 µs settling time for fully settled data. This performance is enabled by its sinc5 + sinc1 digital filter architecture and crosspoint multiplexer, allowing rapid switching between up to five analog inputs (AIN0–AIN4) while maintaining accuracy across temperature and supply variations - critical for high-throughput PLC modules and multichannel data loggers using the AD7172-2BRUZ.
Does the AD7172-2BRUZ require an external reference voltage?
No, the AD7172-2BRUZ integrates a precision 2.5 V bandgap reference with ±2 ppm/°C drift (0°C to 105°C) and 4.5 µVrms 0.1–10 Hz noise, delivered via the REFOUT pin. While external references (1 V to AVDD1) are supported via REF+/REF−, the internal reference eliminates BOM cost and layout complexity in most industrial and medical applications - a key differentiator of the AD7172-2BRUZ versus competing converters lacking on-chip reference buffering.
How does the AD7172-2BRUZ handle 50 Hz and 60 Hz interference rejection?
The AD7172-2BRUZ provides hardware-based simultaneous 50 Hz and 60 Hz rejection achieving >120 dB attenuation at 20 SPS output data rate using its enhanced digital filter architecture. Unlike software-based notch filters, this rejection is deterministic, requires no host CPU resources, and remains effective across temperature and supply voltage - making the AD7172-2BRUZ ideal for use in electrically noisy factory floors or laboratory environments where mains-borne interference would otherwise corrupt sensor readings.
Can the AD7172-2BRUZ drive external circuitry from its REFOUT pin?
Yes, the AD7172-2BRUZ REFOUT pin delivers a buffered 2.5 V reference capable of sourcing/sinking ±10 mA, with load regulation of 50 ppm/mA and 215 nV/√Hz noise density at 1 kHz. This allows direct driving of external ADCs, DACs, or sensor excitation circuits without additional op-amp buffering - a capability confirmed in the AD7172-2BRUZ datasheet Table 1 and validated in Analog Devices' CN-0383 reference design, reducing system-level component count and improving overall measurement stability.
What package type and thermal characteristics apply to the AD7172-2BRUZ?
The AD7172-2BRUZ is supplied in a 24-lead TSSOP package (4.4 mm × 7.8 mm) with exposed thermal pad, exhibiting θJA = 81°C/W on a 2-layer JEDEC board. Its dual LDO architecture (separate analog/digital 1.8 V supplies) and low 1.5 mA operating current minimize self-heating, enabling reliable operation in sealed enclosures or high-ambient-temperature environments - a thermal profile explicitly characterized in the AD7172-2BRUZ datasheet Table 4 and Figure 22.
AD7172-2BRUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 31.25k
- Number of Inputs:
- 2, 4
- 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:
- 24-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7172-2BRUZ FAQ
1.How can I place an order for AD7172-2BRUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7172-2BRUZ 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 AD7172-2BRUZ reliable?
The price and inventory of AD7172-2BRUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7172-2BRUZ is usually 5 days.
3.What payment methods are accepted for AD7172-2BRUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7172-2BRUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7172-2BRUZ?
AD7172-2BRUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7172-2BRUZ 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 AD7172-2BRUZ?
For technical support, including AD7172-2BRUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7172-2BRUZ requirements.
6.How does Aetrix verify that AD7172-2BRUZ is sourced from the original manufacturer or authorized distributors?
All AD7172-2BRUZ 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 AD7172-2BRUZ meets industry standards.
7.What is the process for return or replacement of AD7172-2BRUZ?
All AD7172-2BRUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7172-2BRUZ, 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 AD7172-2BRUZ part is unused and in its original packaging.
Return procedure for AD7172-2BRUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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