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Analog Devices Inc./Maxim Integrated MAX154ACWG+T
- Part No.:
- MAX154ACWG+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX154ACWG+T.pdf
- Description:
- IC ADC 8BIT FLASH 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,059
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Product details
Overview
MAX154ACWG+T from Maxim Integrated is a high-speed, 8-bit analog-to-digital converter with four-channel multiplexer, on-chip 2.5V reference, built-in track/hold, and 2.5µs conversion time per channel. It operates from a single +5V supply, accepts 0V to +5V analog inputs, and interfaces directly to microprocessor data buses via latched three-state outputs - used in real-time speech analysis and high-speed servo control systems.
For engineers reviewing the MAX154ACWG+T datasheet, MAX154ACWG+T pinout, MAX154ACWG+T application, or MAX154ACWG+T equivalent, key selection considerations include its ±1/2 LSB total unadjusted error, SSOP-24 package footprint, Mode 0/Mode 1 digital interface flexibility, and absence of external clock requirement.
Technical Context
The MAX154ACWG+T 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 analog input stage includes sampled-data comparators with 45pF input capacitance and 0.7V/µs slew rate tracking capability.
Digital interface relies solely on CS and RD control lines, supporting two modes: Mode 0 (WAIT-state compatible, conversion and data read synchronized) and Mode 1 (non-WAIT, overlapping conversion and previous result read). Status is signaled via open-drain RDY and active-low INT outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes for precise quantization of analog signals. |
| Conversion Time | 2.5µs per channel - enables up to 100kHz sampling rate per channel in MAX154 configuration. |
| Total Unadjusted Error | ±1/2 LSB - ensures monotonicity and no missing codes across full operating temperature range (0°C to +70°C). |
| Analog Input Range | 0V to +5V - compatible with standard TTL/CMOS logic levels and single-supply signal chains. |
| Reference Output | 2.50V ±30mV - stable on-chip voltage reference eliminates need for external precision reference ICs. |
| Supply Voltage | +5V ±5% - operates from standard logic rail without auxiliary supplies or regulators. |
| Input Capacitance | 45pF - defines required source impedance limit (<100Ω) to meet 1µs acquisition settling time. |
Pinout & Package
MAX154ACWG+T is housed in a 24-pin Wide SOIC (SO-24) package, measuring 7.65mm × 10.33mm × 2.4mm, with 0.65mm lead pitch and gull-wing leads suitable for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | AIN1 | Analog input channel 1 - one of four single-ended inputs selectable via A0/A1 address lines. |
| 2 | AIN2 | Analog input channel 2 - shares same internal track/hold and reference path as AIN1–AIN4. |
| 3 | AIN3 | Analog input channel 3 - supports multiplexed sampling without external mux or hold circuitry. |
| 4 | AIN4 | Analog input channel 4 - completes the 4-channel set; unused pins (A2, NC) are no-connect in MAX154 variant. |
| 5 | A0 | Channel address bit 0 - LSB of 2-bit address controlling analog input selection (00–11). |
| 6 | A1 | Channel address bit 1 - MSB of 2-bit address; together with A0, selects one of four analog inputs. |
| 7 | VDD | +5V power supply - powers all internal logic, reference, and conversion circuitry. |
| 8 | N.C. | No connect - pin 8 is unconnected internally; must be left floating or tied to GND per layout guidelines. |
| 9 | CS | Chip-select input - active-low enable that latches address and initiates conversion when RD also low. |
| 10 | RD | Read input - controls data access timing and determines interface mode (Mode 0 or Mode 1). |
| 11 | INT | Interrupt output - active-low open-drain signal indicating completion of current conversion. |
| 12 | GND | Ground reference - common return for analog, digital, and reference circuits; requires low-impedance connection. |
| 13 | VREF− | Reference lower span - sets zero-code voltage; connected to GND for standard 0V–5V input range. |
| 14 | VREF+ | Reference upper span - sets full-scale voltage; typically tied to VDD (+5V) for 0V–5V operation. |
| 15 | RDY | Ready output - open-drain status signal for WAIT-state microprocessors; goes high-impedance at conversion end. |
| 16 | REF OUT | 2.5V reference output - buffered on-chip voltage source usable for external circuit biasing or scaling. |
| 17–24 | DB0–DB7 | Data bus outputs - latched, three-state outputs delivering 8-bit parallel conversion result. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates external sample-and-hold IC and associated layout complexity, reducing BOM count and board area. |
| On-chip 2.5V reference | Provides stable, temperature-compensated reference without external components - simplifies system-level calibration. |
| Single +5V supply operation | Removes need for dual-rail or precision analog supplies, enabling direct integration into digital-centric embedded systems. |
| Memory-mapped or I/O-port interface | Appears as either memory location or peripheral port to microprocessor - no glue logic required for 8051, Z80, or x86 systems. |
| No external clock required | Internal timing generator synchronizes conversion sequence to CS/RD edges - reduces EMI and clock routing overhead. |
Applications
| Speech Analysis System | High-Speed Servo Control Loop |
|---|---|
Use Scenario: Real-time digitization of eight-band filtered audio signals from microphone array for spectral feature extraction. IC Role / Device Role / Timing Role: 4-channel ADC capturing time-aligned samples from bandpass-filtered speech channels at ≥50kHz aggregate rate. Use Value: 2.5µs conversion time and built-in track/hold ensure accurate capture of transient phonemes without external hold circuitry. |
Use Scenario: Closed-loop position feedback in industrial CNC motion controller with <10µs latency budget. IC Role / Device Role / Timing Role: Analog front-end digitizing motor current and encoder analog outputs for PID computation. Use Value: ±1/2 LSB error and 0V–5V input range match standard op-amp output swing, minimizing gain-stage recalibration. |
| Telecom Channel Monitoring | DSP-Based Signal Acquisition |
Use Scenario: Simultaneous monitoring of four analog line-status signals (voltage, current, temperature) in telecom line card. IC Role / Device Role / Timing Role: Multi-channel data acquisition unit interfacing to 80C188EX microcontroller via Mode 0 WAIT-state protocol. Use Value: RDY output directly drives processor WAIT input, eliminating software polling and guaranteeing deterministic read timing. |
Use Scenario: Front-end for TI C67x DSP evaluating sensor fusion algorithms with mixed analog sources. IC Role / Device Role / Timing Role: High-fidelity digitizer feeding 8-bit data stream into DMA-accessible memory via three-state DB0–DB7 bus. Use Value: Latched three-state outputs drive 50pF loads at 2.4V VOH without bus contention, ensuring clean signal integrity into DSP data bus. |
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 |
|---|---|---|---|
| MAX154BCWG+T | ±1 LSB total unadjusted error vs. ±1/2 LSB; otherwise identical pinout, timing, and electrical specs. | Suitable for cost-sensitive designs where 1/2 LSB monotonicity is not required. | Select MAX154BCWG+T only if system-level linearity testing confirms ±1 LSB meets accuracy budget. |
| ADS7822U | 12-bit resolution, SPI interface, 2.4µs conversion, no internal reference - requires external 2.5V reference and level-shifting for +5V systems. | Better resolution but higher software overhead; incompatible pinout and serial interface precludes drop-in replacement. | Choose ADS7822U only when 12-bit precision justifies redesign of interface firmware and reference subsystem. |
Compared with MAX154BCWG+T, the MAX154ACWG+T provides tighter DC accuracy critical for closed-loop control; compared with ADS7822U, it offers simpler parallel bus integration and lower system-level component count despite lower resolution.
Availability
MAX154ACWG+T is available at Aetrix Electronics and suitable for high-speed data acquisition, real-time speech analysis, and industrial servo control applications requiring stable component supply across extended production lifecycles.
Supply support for MAX154ACWG+T 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 demanding industrial, communications, and computing applications.
The MAX154ACWG+T belongs to Maxim's high-speed data acquisition product line, engineered specifically for embedded systems needing fast, self-contained ADC functionality with minimal external components.
FAQ
What is the operating temperature range for MAX154ACWG+T?
The MAX154ACWG+T is rated for commercial temperature operation from 0°C to +70°C. This range is defined by the 'C' grade suffix in the part number and is validated across all electrical specifications including ±1/2 LSB total unadjusted error, 2.5µs conversion time, and 2.50V ±30mV reference output stability.
Does MAX154ACWG+T require an external clock source?
No, the MAX154ACWG+T does not require an external clock. Its internal timing generator uses CS and RD control edges to synchronize the half-flash conversion sequence, eliminating clock distribution, jitter concerns, and external oscillator components - a key design advantage confirmed in the Functional Diagram (Figure 3) and Digital Interface section.
Can MAX154ACWG+T interface directly with a 3.3V microprocessor data bus?
MAX154ACWG+T outputs are CMOS-compatible with VOH ≥4.0V and VOL ≤0.4V at VDD = +5V, so direct connection to a 3.3V bus risks overvoltage damage. A level-shifter or series resistor network is required; the device itself does not support mixed-voltage I/O and must be used with +5V logic families or translated interfaces.
What is the purpose of the REF OUT pin on MAX154ACWG+T?
The REF OUT pin delivers a buffered 2.50V ±30mV reference voltage derived from the internal bandgap circuit. It can power external circuitry such as sensor excitation or op-amp bias networks, provided load current stays within ±30mA - specified in Absolute Maximum Ratings and verified in Typical Operating Characteristics plots.
How does the track/hold function operate in MAX154ACWG+T?
The MAX154ACWG+T integrates a track/hold that automatically engages during the first ~1µs of each conversion cycle, sampling the selected analog input (AIN1–AIN4) before initiating the half-flash conversion. This eliminates external track/hold ICs and associated timing-critical PCB routing, as documented in the Operating Sequence and Detailed Description sections.
MAX154ACWG+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX154ACWG+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX154ACWG+T 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+T reliable?
The price and inventory of MAX154ACWG+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX154ACWG+T is usually 5 days.
3.What payment methods are accepted for MAX154ACWG+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX154ACWG+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX154ACWG+T?
MAX154ACWG+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX154ACWG+T 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+T?
For technical support, including MAX154ACWG+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX154ACWG+T requirements.
6.How does Aetrix verify that MAX154ACWG+T is sourced from the original manufacturer or authorized distributors?
All MAX154ACWG+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX154ACWG+T?
All MAX154ACWG+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX154ACWG+T, 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+T part is unused and in its original packaging.
Return procedure for MAX154ACWG+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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