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Analog Devices Inc. AD7173-8BCPZ
- Part No.:
- AD7173-8BCPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 40-WFQFN Exposed Pad, CSP
- Datasheet:
-
AD7173-8BCPZ.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 40LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,008
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Product details
Overview
AD7173-8BCPZ from Analog Devices is a low-power, 24-bit sigma-delta ADC with integrated analog input buffers, precision 2.5 V reference (3.5 ppm/°C), and crosspoint multiplexer. It supports 8 differential or 16 single-ended channels, delivers up to 31.25 kSPS output data rate, and achieves 17.5 noise-free bits at full speed-ideal for high-accuracy industrial process monitoring and multichannel sensor acquisition.
For engineers reviewing the AD7173-8BCPZ datasheet, AD7173-8BCPZ pinout, AD7173-8BCPZ application, or AD7173-8BCPZ equivalent, key selection considerations include its per-channel configurability (sinc3/sinc5+sinc1 filters), built-in diagnostics (CRC, temperature sensor, burnout currents), and dual-supply flexibility (AVDD1 = 3.3 V or 5 V, IOVDD = 2–5.5 V) in harsh industrial environments.
Technical Context
The AD7173-8BCPZ implements a dual-stage digital filter architecture: sinc5 + sinc1 for fast channel scanning (6.21 kSPS/channel, 161 µs settling) and sinc3 for maximum resolution (24 noise-free bits at 1.25 SPS) with enhanced 50 Hz/60 Hz rejection (120 dB). Its crosspoint multiplexer enables system-level diagnostics by routing any analog input to any ADC channel path.
It integrates two independent LDOs (1.8 V for analog core, 1.8 V for digital logic), configurable GPIO/GPO pins with automatic external mux control, and Schmitt-triggered serial interface compatible with SPI/QSPI/MICROWIRE/DSP protocols. The internal 2 MHz oscillator eliminates external clock components while supporting crystal (14–16.384 MHz) or external clock (2–2.048 MHz) alternatives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit sigma-delta ADC with no missing codes guaranteed across all ODRs except sinc3 at 31.25 kSPS |
| Output Data Rate | 1.25 SPS to 31.25 kSPS programmable per channel; sinc5+sinc1 enables 6.21 kSPS/channel scan rate |
| Noise-Free Resolution | 17.5 bits @ 31.25 kSPS (sinc5+sinc1), 24 bits @ 1.25 SPS (sinc3) |
| INL Error | ±3 ppm/FSR typical with 2.5 V internal reference; ±5 ppm/FSR with 5 V external reference |
| Power Consumption | 1.4 mA total current @ full operation (3.3 V AVDD1, buffered inputs, internal reference, internal clock) |
| Reference Accuracy | 2.5 V ±0.1% initial accuracy; 3.5 ppm/°C tempco over −40°C to +105°C |
| 50/60 Hz Rejection | 120 dB at 20 SPS with internal clock and sinc3 filter; 85–90 dB normal-mode rejection |
Pinout & Package
AD7173-8BCPZ is housed in a 40-lead, 6 mm × 6 mm LFCSP package with exposed thermal pad soldered to AVSS for mechanical stability and heat dissipation. Pin 1 is marked via top-side laser etch; the exposed pad must be connected to AVSS on PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0/REF2−, AIN1/REF2+, AIN2–AIN16 | Analog Input / External Reference Input | Supports 8 differential or 16 single-ended channels via crosspoint mux; REF2± accepts external reference up to AVDD1 |
| REFOUT, REF+, REF− | Internal Reference Output / Reference Inputs | REFOUT provides buffered 2.5 V reference; REF+/REF− accept external reference or connect to internal REFOUT |
| AVDD1, AVDD2, AVSS, IOVDD, DGND | Analog & Digital Power Supplies | Split analog supplies (AVDD1/AVDD2/AVSS) enable ±2.5 V or ±1.65 V operation; IOVDD independent (2–5.5 V) allows mixed-voltage interfacing |
| DIN, DOUT/RDY, SCLK, CS | Serial Interface Signals | 3-/4-wire SPI-compatible interface with Schmitt-triggered SCLK for noise immunity; DOUT/RDY serves dual role as data output and conversion-ready interrupt |
| GPIO0, GPIO1, GPO2, GPO3, ERROR, SYNC | General-Purpose I/O & Control | GPIOs referenced to AVDD1/AVSS; ERROR supports open-drain error aggregation; SYNC enables multi-device filter synchronization |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel configuration | Eight independent setup registers allow unique ODR, filter type, gain, offset correction, and buffer enable per channel |
| Integrated diagnostics | CRC on serial data, register checksum, on-chip temperature sensor (±2°C after calibration), burnout currents (±10 µA), and crosspoint mux for signal path validation |
| Flexible power management | Standby mode (400 µA with reference on), power-down mode (2 µA), and programmable LDOs reduce system-level power design complexity |
| Enhanced EMI robustness | Schmitt-triggered SCLK and 85–90 dB normal-mode rejection support reliable operation in noisy industrial settings without external filtering |
| Single-cycle settling | Enables rapid channel switching with guaranteed 161 µs settling time at 6.21 kSPS/channel scan rate using sinc5+sinc1 filter |
Applications
| Process Control Modules | Voltage & Current Monitoring |
|---|---|
Use Scenario: High-density PLC/DCS I/O modules acquiring thermocouple, RTD, and 4–20 mA loop signals across 16 sensor channels. IC Role / Device Role / Timing Role: Primary multichannel ADC with integrated buffers, reference, and diagnostics-replaces discrete signal conditioning chains. Use Value: Eliminates external op-amps and reference ICs; 24-bit resolution and 120 dB 50/60 Hz rejection ensure compliance with IEC 61000-4-30 Class A power quality standards. |
Use Scenario: Precision front-end for industrial energy meters measuring phase voltage/current with anti-tampering diagnostics. IC Role / Device Role / Timing Role: Simultaneous sampling ADC with per-channel gain/offset calibration and burnout detection for open-wire fault identification. Use Value: Built-in crosspoint mux validates sensor integrity before conversion; sinc3 filter delivers 24 noise-free bits at 1.25 SPS for metrology-grade accuracy. |
| Chemical Analysis Instruments | Seismic Data Acquisition |
Use Scenario: Multi-analyte chromatography systems requiring synchronized acquisition of detector outputs across 8+ channels. IC Role / Device Role / Timing Role: Channel-scanning ADC with synchronized digital filters and SYNC pin for multi-board timing alignment. Use Value: 6.21 kSPS/channel scan rate and single-cycle settling enable real-time peak detection without inter-channel skew. |
Use Scenario: Low-power, high-resolution seismic node recording ground acceleration with battery backup. IC Role / Device Role / Timing Role: Ultra-low-noise ADC operating in standby mode between events; wake-up triggered by internal threshold detection. Use Value: 2 µA power-down current extends battery life; 17.5 noise-free bits at 31.25 kSPS captures microseismic events above thermal floor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision multichannel sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7172-2BRUZ | 2-channel variant; identical architecture, same 24-bit resolution and 31.25 kSPS max ODR but half the channel count and smaller 32-lead TSSOP package | Best suited for compact, dual-sensor systems where board space is constrained and channel density is not required | Select AD7172-2BRUZ when only two high-accuracy channels are needed and LFCSP assembly is not feasible |
| ADS131M08IPBSR | Texas Instruments part with 8-channel, 24-bit delta-sigma ADC; no integrated reference or crosspoint mux; requires external 2.5 V reference and external multiplexer control logic | Targets cost-sensitive industrial DAQ where external component count is acceptable and diagnostic features are secondary | Choose ADS131M08IPBSR for lower BOM cost in non-critical applications lacking need for self-test or reference integration |
Compared with AD7173-8BCPZ, AD7172-2BRUZ reduces channel count and package size but retains identical per-channel configurability and noise performance, while ADS131M08IPBSR trades integrated diagnostics and reference for lower unit cost and simpler supply requirements-making AD7173-8BCPZ optimal for space-constrained, high-integrity multichannel systems demanding minimal external components.
Availability
AD7173-8BCPZ is available at Aetrix Electronics and suitable for process control modules, chemical analysis instrumentation, and seismic data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial OEM deployments.
Supply support for AD7173-8BCPZ 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 design and manufacturing operations worldwide.
The AD7173 family targets high-accuracy, low-power industrial measurement applications-specifically engineered to replace complex discrete signal chains in PLCs, analyzers, and scientific instruments with a single highly integrated ADC solution.
FAQ
What is the maximum channel scan rate achievable with AD7173-8BCPZ?
The AD7173-8BCPZ achieves a maximum channel scan rate of 6.21 kSPS per channel when using the sinc5 + sinc1 digital filter configuration. This corresponds to 161 µs settling time per channel and is enabled by single-cycle settling capability. The rate assumes full 24-bit resolution and is validated under standard conditions with internal reference and buffered inputs.
Does AD7173-8BCPZ support both internal and external reference configurations?
Yes, AD7173-8BCPZ supports flexible reference options: it integrates a 2.5 V precision bandgap reference (3.5 ppm/°C) accessible via REFOUT, and also accepts external references up to AVDD1 on REF2+ and REF2− pins. The REFSEL bits in the setup configuration register select between internal and external reference sources per channel.
Can AD7173-8BCPZ operate with split analog supplies?
Yes, AD7173-8BCPZ supports split analog supplies: AVDD1 and AVSS can be configured as ±2.5 V or ±1.65 V, enabling bipolar input ranges without level-shifting circuitry. This mode requires disabling analog input buffers and configuring AVDD2 appropriately per the power supply section of the datasheet.
How does the crosspoint multiplexer in AD7173-8BCPZ enhance system diagnostics?
The crosspoint multiplexer in AD7173-8BCPZ allows any analog input (AIN0–AIN16) to be routed to any ADC channel path, enabling in-system verification of sensor wiring, mux integrity, and signal chain gain/offset without hardware reconfiguration. Combined with burnout currents and CRC-checked register access, it forms a comprehensive self-test framework.
What digital interface protocols is AD7173-8BCPZ compatible with?
AD7173-8BCPZ supports SPI, QSPI, MICROWIRE, and DSP-compatible serial interfaces using standard 3-/4-wire connections (CS, SCLK, DIN, DOUT/RDY). Its Schmitt-triggered SCLK input ensures robust operation in electrically noisy environments, and the DOUT/RDY pin functions as both data output and conversion-ready interrupt signal.
AD7173-8BCPZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad, CSP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 31.25k
- Number of Inputs:
- 8, 16
- 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:
- 40-LFCSP-WQ (6x6)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7173-8BCPZ FAQ
1.How can I place an order for AD7173-8BCPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7173-8BCPZ 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 AD7173-8BCPZ reliable?
The price and inventory of AD7173-8BCPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7173-8BCPZ is usually 5 days.
3.What payment methods are accepted for AD7173-8BCPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7173-8BCPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7173-8BCPZ?
AD7173-8BCPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7173-8BCPZ 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 AD7173-8BCPZ?
For technical support, including AD7173-8BCPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7173-8BCPZ requirements.
6.How does Aetrix verify that AD7173-8BCPZ is sourced from the original manufacturer or authorized distributors?
All AD7173-8BCPZ 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 AD7173-8BCPZ meets industry standards.
7.What is the process for return or replacement of AD7173-8BCPZ?
All AD7173-8BCPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7173-8BCPZ, 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 AD7173-8BCPZ part is unused and in its original packaging.
Return procedure for AD7173-8BCPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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