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Analog Devices Inc./Maxim Integrated MAX172ACWG+
- Part No.:
- MAX172ACWG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX172ACWG+.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,393
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Product details
Overview
MAX172ACWG+ 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 SOIC 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 MAX172ACWG+ datasheet, MAX172ACWG+ pinout, MAX172ACWG+ application, or MAX172ACWG+ equivalent, key selection considerations include its 100kSPS throughput, on-chip 2.5V reference, TTL/CMOS-compatible digital interface, and industrial temperature range operation.
Technical Context
The MAX172ACWG+ implements a successive-approximation register (SAR) architecture with internal sampling capacitor and clock generator. It integrates a precision 2.5V bandgap reference and requires no external reference or clock components for basic operation.
Digital interface uses an 8-bit parallel bus with separate RD, WR, and CS control lines, supporting direct connection to 8051- and Z80-family microcontrollers. Conversion is initiated by WR pulse and completed within 10μs, with BUSY signal indicating status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 part in 4096 quantization granularity for medium-precision sensor or process monitoring. |
| Sampling Rate | 100 kSPS - supports real-time capture of signals up to ~40 kHz without aliasing under Nyquist criterion. |
| INL | ±1 LSB - ensures monotonicity and predictable code transitions across full scale, critical for closed-loop control. |
| Supply Voltage | +5V only - simplifies power design with single-rail requirement; no dual-supply or negative rail needed. |
| Reference | Internal 2.5V - eliminates need for external reference IC or resistor divider, reducing BOM count and layout area. |
| Operating Temp | 0°C to +70°C - rated for commercial-grade environments including office equipment and non-critical industrial panels. |
Pinout & Package
MAX172ACWG+ is packaged in a 24-pin wide-body SOIC (SOIC-W) with 300-mil width and standard 0.050" lead pitch. Pinout conforms to Maxim's legacy ADC pin assignment for parallel-interface 12-bit converters.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND | Analog Ground | Return path for analog input and reference circuitry; must be isolated from DGND at single-point star ground. |
| DGND | Digital Ground | Return for digital I/O and logic; separation from AGND prevents noise coupling into conversion path. |
| VDD | +5V Supply | Primary power for both analog and digital sections; requires local 0.1μF ceramic decoupling. |
| REF | Reference Output | Provides stable 2.5V output; can serve as reference for external circuits if buffered. |
| IN+ | Analog Input (+) | Differential input terminal; accepts 0V to VREF unipolar or ±VREF bipolar with external op-amp front-end. |
| CS | Chip Select | Active-low enable for parallel bus; must be asserted before WR to initiate conversion sequence. |
| WR | Write Strobe | Edge-triggered command to start conversion; falling edge latches address and initiates SAR cycle. |
| RD | Read Strobe | Active-low signal to output converted data onto D0–D7 bus; timing must meet tACC ≤ 100ns. |
| BUSY | Conversion Status | Active-high open-drain output; indicates conversion in progress; used for polling or interrupt generation. |
| D0–D7 | Data Bus | 8-bit multiplexed data/address bus; lower 4 bits carry MSBs during read; upper 4 bits carry LSBs. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip track/hold amplifier | Enables accurate sampling of signals up to 100kHz without external sample-hold circuitry. |
| Internal clock generator | Removes need for external crystal or oscillator, reducing component count and board space. |
| TTL/CMOS-compatible interface | Direct interfacing with 8051, Z80, and 68000-family microcontrollers without level-shifting. |
| Monotonic over full temperature range | Guarantees no missing codes from 0°C to +70°C, essential for position or feedback control loops. |
Applications
| Industrial Data Loggers | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous voltage/current logging from multiple sensors in factory-floor PLC add-on modules. IC Role / Device Role / Timing Role: Primary ADC digitizing analog sensor outputs at 100ksps with onboard reference stability. Use Value: Reduces system BOM by eliminating external reference and clock, while maintaining ±1 LSB INL across operating temperature. | Use Scenario: Portable multimeter or waveform capture unit requiring compact, self-contained digitization. IC Role / Device Role / Timing Role: Standalone 12-bit ADC interfaced directly to microcontroller via 8-bit parallel bus. Use Value: 10μs conversion time enables responsive UI updates and real-time peak detection without DMA overhead. |
| Medical Instrumentation | Communications Baseband Processing |
Use Scenario: Patient vital sign monitor acquiring ECG or temperature signals in low-power bedside units. IC Role / Device Role / Timing Role: Medium-speed ADC handling conditioned biopotential signals with minimal external support components. Use Value: Internal 2.5V reference ensures consistent full-scale calibration across production units without trimming. | Use Scenario: Analog front-end for narrowband radio receivers digitizing IF or baseband signals. IC Role / Device Role / Timing Role: Digitizer for DC-coupled analog paths where 12-bit resolution suffices for SNR > 70dB. Use Value: Single +5V supply simplifies power architecture in multi-rail communication subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit parallel-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7823ANZ | 8-bit resolution, 200ksps, +5V supply, no internal reference - requires external 2.5V reference. | Lower resolution limits dynamic range; higher speed suits faster transient capture but sacrifices precision. | Select when cost-sensitive designs prioritize speed over 12-bit fidelity and can accommodate external reference. |
| MAX195BCNG+ | 16-bit resolution, 100ksps, +5V supply, internal reference - larger 28-pin PDIP package, higher power (30mW vs. 24mW). | Higher resolution supports precision instrumentation; larger footprint and power limit use in space-constrained portable devices. | Select when system requires ≥90dB SNR and can accommodate larger package and thermal budget. |
Compared with AD7823ANZ and MAX195BCNG+, the MAX172ACWG+ balances 12-bit accuracy, integrated reference, and SOIC packaging for cost- and space-sensitive industrial data acquisition where 100ksps and ±1 LSB INL are design requirements.
Availability
MAX172ACWG+ is available at Aetrix Electronics and suitable for industrial data loggers, test equipment, and medical instrumentation requiring stable component supply and long-term sourcing continuity.
Supply support for MAX172ACWG+ 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) designs precision analog, mixed-signal, and high-reliability semiconductor solutions for industrial, communications, and computing markets.
The MAX172ACWG+ belongs to Maxim's legacy high-speed parallel ADC product line, engineered for embedded systems needing self-contained, medium-resolution digitization without external timing or reference components.
FAQ
What is the maximum sampling rate of the MAX172ACWG+?
The MAX172ACWG+ achieves a maximum sampling rate of 100 kSPS. This rate is guaranteed across its specified operating temperature range (0°C to +70°C) and with proper decoupling and timing compliance. Each conversion completes within 10 μs, enabling deterministic real-time data capture for control and monitoring applications using the MAX172ACWG+.
Does the MAX172ACWG+ require an external reference voltage?
No, the MAX172ACWG+ includes an internal 2.5V precision bandgap reference. This eliminates the need for external reference components in most configurations. The REF pin provides this voltage for optional use by external circuitry, and the MAX172ACWG+ maintains ±1 LSB INL performance using its internal reference without trimming.
What digital interface does the MAX172ACWG+ support?
The MAX172ACWG+ supports an 8-bit parallel TTL/CMOS-compatible interface with dedicated CS, WR, RD, and BUSY control lines. It interfaces directly with microcontrollers such as the 8051 and Z80 families without level shifters. Data is multiplexed across D0–D7, with timing parameters defined in the MAX172ACWG+ datasheet for reliable read/write cycles.
Is the MAX172ACWG+ pin-compatible with other Maxim ADCs?
The MAX172ACWG+ uses Maxim's standard 24-pin SOIC pinout for parallel 12-bit ADCs, matching pin functions (e.g., AGND, DGND, VDD, REF, BUSY) with the MAX170, MAX171, and MAX173. However, differences in internal reference configuration and timing mean firmware or timing logic may require adjustment when substituting - the MAX172ACWG+ is not a drop-in replacement without validation.
What is the operating temperature range for the MAX172ACWG+?
The MAX172ACWG+ is specified for commercial operation from 0°C to +70°C. This range applies to all electrical specifications including INL, sampling rate, and reference accuracy. Designs intended for extended temperature environments must verify performance empirically or select industrial-grade alternatives such as the MAX172BCWG+ (–40°C to +85°C), which shares the same pinout and functionality as the MAX172ACWG+.
MAX172ACWG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX172ACWG+ FAQ
1.How can I place an order for MAX172ACWG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX172ACWG+ 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 MAX172ACWG+ reliable?
The price and inventory of MAX172ACWG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX172ACWG+ is usually 5 days.
3.What payment methods are accepted for MAX172ACWG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX172ACWG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX172ACWG+?
MAX172ACWG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX172ACWG+ 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 MAX172ACWG+?
For technical support, including MAX172ACWG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX172ACWG+ requirements.
6.How does Aetrix verify that MAX172ACWG+ is sourced from the original manufacturer or authorized distributors?
All MAX172ACWG+ 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 MAX172ACWG+ meets industry standards.
7.What is the process for return or replacement of MAX172ACWG+?
All MAX172ACWG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX172ACWG+, 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 MAX172ACWG+ part is unused and in its original packaging.
Return procedure for MAX172ACWG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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