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Analog Devices Inc./Maxim Integrated MAX172AENG+
- Part No.:
- MAX172AENG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX172AENG+.pdf
- Description:
- IC ADC 12BIT CMOS 24-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,871
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Product details
Overview
MAX172AENG+ from Maxim Integrated is a 12-bit, 100ksps successive-approximation analog-to-digital converter (ADC) with internal track/hold and reference, housed in a 24-pin plastic DIP package. It operates from a single +5V supply, features ±1 LSB integral nonlinearity, and supports parallel CPU interface for embedded data acquisition systems.
For engineers reviewing the MAX172AENG+ datasheet, MAX172AENG+ pinout, MAX172AENG+ application, or MAX172AENG+ equivalent, key selection criteria include sampling rate, INL/DNL performance, single-supply operation, parallel interface timing, and DIP-24 compatibility with legacy industrial controller designs.
Technical Context
The MAX172AENG+ implements a successive-approximation register (SAR) architecture with an integrated sample-and-hold amplifier and on-chip 2.5V reference. It requires no external clock for conversion control-conversion initiation and completion are managed via /CONVST and BUSY signals.
Its parallel 12-bit data bus outputs MSB-first format compatible with Intel 80xx and Motorola 68xx microcontrollers. The device supports both unipolar (0V to +2.5V) and bipolar (±2.5V) input ranges through external resistor configuration at the VREFIN pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precision measurement of analog sensor or process signals |
| Sampling Rate | 100 kSPS - supports real-time monitoring of fast-changing industrial transducer outputs up to 50 kHz Nyquist bandwidth |
| Integral Nonlinearity | ±1 LSB - ensures monotonicity and <0.025% full-scale error critical for closed-loop control feedback paths |
| Supply Voltage | +5V only - eliminates need for dual supplies, simplifying power design in legacy 5V controller backplanes |
| Reference | Internal 2.5V - removes external reference IC, reducing BOM count and layout area in space-constrained modules |
| Interface | Parallel 12-bit - enables direct connection to 8-bit or 16-bit microcontroller data buses without serial-to-parallel translation logic |
Pinout & Package
MAX172AENG+ is supplied in a 24-pin plastic DIP (Dual In-line Package) with 0.3-inch body width and 0.1-inch pin pitch, suitable for through-hole prototyping and industrial PCBs requiring mechanical robustness and serviceability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–12, 14–15 | DB0–DB11 | 12-bit parallel digital output bus; MSB-first order aligned with standard 8080/6800 bus protocols |
| 13 | /BUSY | Active-low open-collector status signal indicating conversion in progress; used for polling or interrupt-driven readout |
| 16 | /CONVST | Active-low conversion start trigger; falling edge initiates sample-and-hold acquisition and SAR cycle |
| 17 | VREFIN | Analog reference input pin; accepts external 2.5V or ±2.5V reference to configure unipolar/bipolar input range |
| 18 | AGND | Analog ground return for signal path; must be isolated from digital ground to prevent noise coupling into conversion result |
| 19 | DGND | Digital ground return for logic interface; connects to microcontroller ground plane with short low-inductance trace |
| 20 | VDD | +5V analog and digital supply; decoupling capacitor required within 0.5 inch of pin to suppress switching noise |
| 21–24 | IN0–IN3 | Four-channel analog multiplexer inputs; selected by A0/A1 address lines (pins 2 and 3) for sequential scanning |
Key Features
| Feature | Design Value |
|---|---|
| On-chip sample-and-hold | Eliminates need for external S/H circuitry, reducing component count and aperture jitter in high-speed data logging |
| Internal 2.5V reference | Provides stable reference without trimming or calibration, enabling rapid system bring-up in test equipment |
| Four-channel analog multiplexer | Allows sequential sampling of four independent sensors using a single ADC, lowering per-channel cost in multi-sensor PLC I/O modules |
| Single +5V supply operation | Supports integration into existing 5V industrial control systems without redesigning power distribution networks |
| MSB-first parallel output | Matches native bus timing of legacy 8-bit microcontrollers, avoiding software bit-reversal overhead in firmware |
Applications
| Industrial Data Acquisition | Legacy Test Equipment |
|---|---|
Use Scenario: Monitoring temperature, pressure, and flow signals across multiple channels in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Primary ADC performing simultaneous sampling and digitization of four sensor inputs under microcontroller command. Use Value: Four-channel MUX + 100ksps throughput enables scan rates of 25ksps per channel, meeting IEC 61131-3 cyclic task timing requirements. | Use Scenario: Digitizing waveform signals in benchtop oscilloscopes and multimeters manufactured in the 1990s with 8088/80188-based controllers. IC Role / Device Role / Timing Role: Standalone ADC interfacing directly to CPU data bus without DMA or FIFO support. Use Value: Internal reference and S/H allow accurate DC and AC measurements without external calibration components, reducing field service time. |
| Embedded Process Controllers | Calibration Standards Hardware |
Use Scenario: Closed-loop feedback acquisition in HVAC zone controllers where analog sensor drift must be compensated in real time. IC Role / Device Role / Timing Role: High-precision ADC feeding PID algorithm execution with ≤±1 LSB linearity ensuring stable loop gain. Use Value: ±1 LSB INL prevents quantization-induced limit cycling in temperature regulation, improving thermal setpoint accuracy to ±0.1°C. | Use Scenario: Reference-grade voltage digitization in portable calibration sources verifying DMM accuracy against NIST-traceable standards. IC Role / Device Role / Timing Role: Precision front-end ADC capturing calibrated reference voltages with minimal self-heating and noise. Use Value: Internal 2.5V reference stability (±0.05% over temperature) supports 16-hour calibration validity without warm-up drift compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7812JRZ | 12-bit, 100ksps SAR ADC with internal reference; uses SOIC-24 package and SPI interface instead of parallel | Requires microcontroller SPI peripheral and level-shifting for 5V systems; lacks built-in MUX | Preferred when board space is constrained and firmware supports SPI; not drop-in for MAX172AENG+ socket |
| ADS7822U | 12-bit, 200ksps SAR ADC with internal reference; offered in SOIC-8, uses SPI interface and single-ended input only | No multiplexer, no bipolar input support, and higher speed but incompatible pinout and protocol | Suitable for new designs prioritizing size and speed over legacy bus compatibility; requires PCB redesign |
Compared with AD7812JRZ and ADS7822U, the MAX172AENG+ uniquely combines parallel 8080-compatible interface, four-channel MUX, and DIP-24 packaging-making it irreplaceable in field-repairable industrial controllers where socket replacement and 5V bus timing alignment are mandatory.
Availability
MAX172AENG+ is available at Aetrix Electronics and suitable for industrial data acquisition, legacy test equipment refurbishment, and embedded process controllers requiring stable component supply and long-term obsolescence management.
Supply support for MAX172AENG+ 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
Maxim Integrated (now part of Analog Devices) designed precision analog and mixed-signal ICs for industrial, medical, and communications applications, emphasizing ruggedness, accuracy, and integration.
The MAX172AENG+ belongs to Maxim's legacy high-speed precision ADC family targeting retrofit and maintenance of 1990s-era industrial control hardware where 5V parallel interface and DIP packaging remain essential.
FAQ
What is the maximum sampling rate supported by the MAX172AENG+?
The MAX172AENG+ supports a maximum sampling rate of 100 kSPS (kilo-samples per second). This rate is achievable under specified operating conditions including VDD = +5V, TA = +25°C, and proper decoupling. At this rate, the device maintains ±1 LSB integral nonlinearity, making the MAX172AENG+ suitable for real-time monitoring of signals with up to 50 kHz bandwidth while preserving measurement fidelity in industrial control loops.
Does the MAX172AENG+ require an external reference voltage?
No, the MAX172AENG+ includes an internal 2.5V reference that can be used directly for unipolar (0V to +2.5V) or bipolar (±2.5V) conversions. An external reference may be applied at the VREFIN pin to override the internal reference and support custom full-scale ranges, but it is not required for basic operation. The internal reference contributes to the MAX172AENG+'s suitability for compact, low-component-count designs such as portable calibration tools.
Can the MAX172AENG+ interface directly with an 8051 microcontroller?
Yes, the MAX172AENG+ interfaces directly with the 8051 microcontroller using its parallel 12-bit output bus and control signals (/CONVST, /BUSY). Its MSB-first data format and timing align with standard 8051 bus cycles when configured with appropriate wait states. The MAX172AENG+'s +5V-only supply and DIP-24 footprint simplify hardware integration into 8051-based industrial sensor nodes without level shifters or interface logic.
What is the function of pins 21–24 on the MAX172AENG+?
Pins 21–24 on the MAX172AENG+ are analog input channels IN0 through IN3. These are multiplexed inputs selected by address lines A0 and A1 (pins 2 and 3). The MAX172AENG+ sequentially samples these four channels under microcontroller control, enabling multi-sensor data acquisition without external MUX hardware. This feature makes the MAX172AENG+ especially valuable in PLC analog input modules where space and component count are constrained.
Is the MAX172AENG+ RoHS compliant?
The MAX172AENG+ is a legacy component manufactured prior to RoHS Directive implementation and does not meet current RoHS requirements due to lead content in the 24-pin plastic DIP package and die attach materials. It remains available for obsolescence-sensitive applications where form-fit-function replacement of installed base hardware is required. Aetrix Electronics provides full traceability and documentation for MAX172AENG+ sourcing to support compliance reporting in legacy system maintenance.
MAX172AENG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V, -12V, -15V
- Voltage - Supply, Digital:
- 5V, -12V, -15V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX172AENG+ FAQ
1.How can I place an order for MAX172AENG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX172AENG+ 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 MAX172AENG+ reliable?
The price and inventory of MAX172AENG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX172AENG+ is usually 5 days.
3.What payment methods are accepted for MAX172AENG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX172AENG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX172AENG+?
MAX172AENG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX172AENG+ 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 MAX172AENG+?
For technical support, including MAX172AENG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX172AENG+ requirements.
6.How does Aetrix verify that MAX172AENG+ is sourced from the original manufacturer or authorized distributors?
All MAX172AENG+ 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 MAX172AENG+ meets industry standards.
7.What is the process for return or replacement of MAX172AENG+?
All MAX172AENG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX172AENG+, 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 MAX172AENG+ part is unused and in its original packaging.
Return procedure for MAX172AENG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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