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Analog Devices Inc./Maxim Integrated MAX154ACWG+
- Part No.:
- MAX154ACWG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX154ACWG+.pdf
- Description:
- IC ADC 8BIT FLASH 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,115
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Product details
Overview
The MAX154ACWG+ from Maxim Integrated is a high-speed 8-bit analog-to-digital converter with four-channel multiplexer, internal 2.5V reference, and 2.5µs conversion time per channel. It operates from a single +5V supply, integrates track/hold functionality, and delivers ±1/2 LSB total unadjusted error - enabling compact, low-component-count data acquisition in real-time control and signal processing systems.
For engineers reviewing the MAX154ACWG+ datasheet, MAX154ACWG+ pinout, MAX154ACWG+ application, or MAX154ACWG+ equivalent, this page provides verified technical context, package-validated pin functions, real-world interface timing constraints, and substitution guidance grounded in manufacturer-specified electrical and functional boundaries.
Technical Context
The MAX154ACWG+ employs a half-flash architecture with two 4-bit flash ADC sections and an internal DAC to generate 8-bit results using 15 comparators. Its conversion sequence begins on falling edges of CS and RD, with MS bits latched after ~1µs tracking and LS bits completed within 2.5µs total.
Digital interface supports Mode 0 (WAIT-state microprocessor) and Mode 1 (non-WAIT), both requiring only CS and RD control lines. INT asserts low at conversion completion; RDY is open-drain and synchronizes to CS edge transitions - no external clock required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes for digitizing analog signals across 0V–5V range. |
| Conversion Time | 2.5µs per channel - enables up to 100kHz sampling rate per input in MAX154 configuration. |
| Total Unadjusted Error | ±1/2 LSB - ensures monotonicity and no missing codes over full temperature range (0°C to +70°C). |
| Reference Output | 2.50V ±3mV - stable on-chip voltage source eliminates need for external reference in most applications. |
| Analog Input Range | 0V to +5V - compatible with standard +5V logic and op-amp output stages without level-shifting. |
| Supply Voltage | +5V ±5% - operates reliably across 4.75V–5.25V, simplifying power rail design. |
| Input Capacitance | 45pF - defines maximum recommended source impedance (<100Ω) to meet 1µs acquisition settling. |
Pinout & Package
MAX154ACWG+ uses a 24-pin Wide SOIC (SO) package (JEDEC MS-013AC), 7.65mm × 15.4mm body, 1.27mm lead pitch. Pin 1 marked by beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | AIN1 | Analog input channel 1 - primary differential-capable input; referenced to VREF− and VREF+. |
| 2 | AIN2 | Analog input channel 2 - shares same internal track/hold and reference structure as AIN1. |
| 3 | AIN3 | Analog input channel 3 - selectable via A0/A1 address inputs; no external hold capacitor needed. |
| 4 | AIN4 | Analog input channel 4 - final channel in 4-input multiplexer; supports simultaneous sampling only in external circuitry. |
| 5 | A0 | Channel address bit 0 - selects one of four analog inputs when combined with A1 (A2 not used in MAX154). |
| 6 | A1 | Channel address bit 1 - determines active analog input; latched on CS/RD falling edge. |
| 7 | VREF− | Reference lower span - sets zero-code voltage; must be tied to GND or external bias point. |
| 8 | VREF+ | Reference upper span - defines full-scale code; accepts 0V to VDD (typically +5V). |
| 9 | GND | Analog/digital ground - common return for reference, analog inputs, and digital I/O; requires low-impedance connection. |
| 10 | INT | Interrupt output - open-drain, active-low signal indicating conversion completion; requires external pull-up. |
| 11 | RDY | Ready output - open-drain status signal synchronized to CS; used for WAIT-state handshaking. |
| 12 | CS | Chip-select input - active-low enable for address latching, conversion start, and output driver activation. |
| 13 | RD | Read input - controls conversion initiation and data access timing; defines Mode 0 vs. Mode 1 operation. |
| 14 | DB0 | Data bus bit 0 (LSB) - three-state output; driven only when CS and RD are asserted and conversion complete. |
| 15 | DB1 | Data bus bit 1 - identical drive characteristics and timing as DB0 through DB7. |
| 16 | DB2 | Data bus bit 2 - latched result of current conversion; high-impedance when CS or RD is high. |
| 17 | DB3 | Data bus bit 3 - valid only after INT assertion or RDY transition in Mode 0. |
| 18 | DB4 | Data bus bit 4 - timing-critical path; tACC1 = 1.6µs max from RD edge to valid data. |
| 19 | DB5 | Data bus bit 5 - shares same load capacitance limit (50pF) and VOL/VOH specs as other DBx pins. |
| 20 | DB6 | Data bus bit 6 - VOH ≥ 2.4V @ IOUT = −1.6mA ensures TTL/CMOS compatibility. |
| 21 | DB7 | Data bus bit 7 (MSB) - completes 8-bit parallel word; all DBx outputs share 5ns max skew. |
| 22 | REF OUT | 2.5V reference output - buffered, low-noise source for external circuitry; max load 10mA. |
| 23 | VDD | +5V supply - powers analog core, reference, and digital interface; requires 47µF + 0.1µF bypassing. |
| 24 | N.C. | No connect - internally unused; must remain floating or tied to GND per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates external sample-and-hold IC and associated timing complexity - reduces BOM and board area. |
| On-chip 2.5V reference | Stable ±100ppm/°C drift and ±3mV load regulation - enables self-contained system without precision external reference. |
| Single +5V supply operation | Removes need for dual-rail or isolated supplies - simplifies power design and improves noise immunity in mixed-signal layouts. |
| Memory-mapped or I/O-port interface | Requires no glue logic - connects directly to 8051, Z80, or 68k data buses using standard read strobes. |
| Mode 0 / Mode 1 software-selectable timing | Supports both WAIT-capable and WAIT-less microprocessors - increases design reuse across legacy and modern controllers. |
Applications
| High-Speed Servo Control | Digital Signal Processing |
|---|---|
|
Use Scenario: Real-time position feedback loop in industrial motor drives sampling encoder or resolver signals at >50kHz. IC Role / Device Role / Timing Role: ADC front-end acquiring analog error voltage from current sense amplifiers with deterministic 2.5µs latency. Use Value: Enables closed-loop bandwidth extension beyond 20kHz while maintaining ±1/2 LSB linearity for precise torque command resolution. |
Use Scenario: Front-end digitization in telecom baseband receivers capturing multi-tone FDM signals before FFT processing. IC Role / Device Role / Timing Role: High-throughput analog capture stage feeding FPGA-based digital downconverters with parallel 8-bit data stream. Use Value: Delivers 100kHz per-channel sampling with integrated reference stability - avoids gain/offset drift-induced spectral leakage in narrowband channels. |
| Audio Instrumentation | High-Speed Data Acquisition |
|
Use Scenario: Portable spectrum analyzer measuring audio band (20Hz–20kHz) with real-time amplitude/frequency display. IC Role / Device Role / Timing Role: Multi-channel input conditioner converting microphone preamp outputs into time-aligned digital samples. Use Value: Built-in track/hold and 45pF input capacitance support direct op-amp coupling - eliminates external hold capacitor and associated settling errors. |
Use Scenario: Embedded test equipment logging transient voltage events in power electronics (e.g., IGBT gate drive waveforms). IC Role / Device Role / Timing Role: Standalone acquisition node capturing 4-channel analog transients with sub-microsecond timestamp alignment. Use Value: 2.5µs conversion + 500ns inter-conversion delay allows 400kHz aggregate sampling - sufficient for 100kHz signal reconstruction per Nyquist. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit, multi-channel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | SPI interface, 2.4µs conversion, 2.7V–5.25V supply, no internal reference - requires external 2.5V ref. | Lower pin count (8-pin SOIC), but serial interface increases MCU overhead vs. MAX154ACWG+'s parallel bus. | Select when board space is critical and microcontroller has SPI bandwidth to spare; avoid if deterministic low-latency parallel reads are required. |
| MAX1113ECM+ | Same 24-pin SO package, 8-bit, 2.5µs conversion, but only 1 input channel and no internal mux - lacks A0/A1 address logic. | Not suitable for multi-channel scanning; requires external multiplexer and timing control for 4-channel use. | Choose only for single-input applications where footprint compatibility matters more than channel count or integration. |
Compared with ADS7822U and MAX1113ECM+, the MAX154ACWG+ uniquely combines 4-channel multiplexing, parallel 8-bit output, on-chip reference, and track/hold in a single +5V device - reducing component count and timing coordination burden in embedded DAQ systems.
Availability
MAX154ACWG+ is available at Aetrix Electronics and suitable for high-speed servo control, digital signal processing, and audio instrumentation requiring stable component supply and long-term production continuity.
Supply support for MAX154ACWG+ 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 power management ICs for industrial, communications, and computing applications.
The MAX154ACWG+ belongs to Maxim's high-speed data acquisition product line, engineered specifically for embedded systems needing fast, accurate, and self-contained analog digitization without external support components.
FAQ
What is the operating temperature range for the MAX154ACWG+?
The MAX154ACWG+ is rated for 0°C to +70°C ambient operation. This commercial-grade temperature specification is confirmed in the Ordering Information table, where "C" suffix denotes the 0°C to +70°C range, and "WG" identifies the 24-pin Wide SOIC package. The device maintains ±1/2 LSB total unadjusted error across this full range.
Does the MAX154ACWG+ require an external clock signal?
No, the MAX154ACWG+ does not require an external clock. Conversion timing is fully self-timed and initiated by the falling edges of CS and RD control signals. The internal half-flash architecture executes the entire 2.5µs conversion autonomously - eliminating clock distribution, jitter sensitivity, and external oscillator BOM cost.
Can the MAX154ACWG+ operate with a reference voltage other than 2.5V?
Yes - the MAX154ACWG+ supports external reference configurations. While its internal REF OUT pin delivers 2.5V, the VREF+ and VREF− pins accept externally applied voltages (0V to VDD) to define the full-scale and zero-scale points. For example, applying 0V to VREF− and +4.096V to VREF+ yields 16mV/LSB resolution, as confirmed in the Electrical Characteristics table under "Analog Input Voltage Range."
What is the maximum recommended source impedance for analog inputs on the MAX154ACWG+?
The MAX154ACWG+ specifies a maximum analog source impedance of 100Ω to ensure full 2.5µs conversion accuracy. This limit arises from the 45pF input capacitance and internal 600Ω multiplexer on-resistance - exceeding 100Ω causes incomplete settling during the 1µs acquisition window, increasing differential nonlinearity beyond ±1/2 LSB.
How does the MAX154ACWG+ handle bipolar input signals?
The MAX154ACWG+ digitizes only unipolar 0V–5V inputs natively. To process bipolar signals (e.g., ±4V), external signal conditioning is required - such as the amplifier network shown in Figure 10a of the datasheet - which shifts and scales the input to fit within the 0V–5V range while preserving polarity information in offset binary format.
MAX154ACWG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 400k
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Flash
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Selectable Address
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX154ACWG+ FAQ
1.How can I place an order for MAX154ACWG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX154ACWG+ 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 MAX154ACWG+ reliable?
The price and inventory of MAX154ACWG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX154ACWG+ is usually 5 days.
3.What payment methods are accepted for MAX154ACWG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX154ACWG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX154ACWG+?
MAX154ACWG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX154ACWG+ 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 MAX154ACWG+?
For technical support, including MAX154ACWG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX154ACWG+ requirements.
6.How does Aetrix verify that MAX154ACWG+ is sourced from the original manufacturer or authorized distributors?
All MAX154ACWG+ 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 MAX154ACWG+ meets industry standards.
7.What is the process for return or replacement of MAX154ACWG+?
All MAX154ACWG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX154ACWG+, 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 MAX154ACWG+ part is unused and in its original packaging.
Return procedure for MAX154ACWG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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