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Analog Devices Inc./Maxim Integrated MAX154AEWG
- Part No.:
- MAX154AEWG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX154AEWG.pdf
- Description:
- IC ADC 8BIT FLASH 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,344
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Product details
Overview
The MAX154AEWG 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, servo control, and telecom data acquisition systems.
For engineers reviewing the MAX154AEWG datasheet, MAX154AEWG pinout, MAX154AEWG application, or MAX154AEWG equivalent, this page delivers verified electrical parameters, package-confirmed pin functions, mode-specific timing behavior, accuracy specifications under defined VREF and temperature conditions, and validated alternative options for industrial embedded and signal-processing designs.
Technical Context
The MAX154AEWG 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 the falling edge of CS and RD, with MS bits latched after ~1µs tracking and LS bits completed within 2.5µs total.
It supports two digital interface modes: Mode 0 (WAIT-state compatible, INT asserts at conversion end) and Mode 1 (non-WAIT, simultaneous read-of-previous-result and start-of-new-conversion). The device uses only CS and RD control lines, with open-drain RDY for READY/WAIT synchronization and active-low INT for completion signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes for precise amplitude quantization in real-time signal capture. |
| Conversion Time | 2.5µs per channel - enables up to 100kHz sampling rate per channel, sufficient for 10kHz sinusoidal input bandwidth without external track/hold. |
| Analog Input Range | 0V to +5V - matches standard TTL/CMOS logic swing and eliminates need for level-shifting circuitry in +5V systems. |
| Reference Output | 2.50V ±3mV (TYP) - stable internal reference reduces BOM count and improves system accuracy vs. external references. |
| Total Unadjusted Error | ±1/2 LSB - ensures monotonicity and no missing codes across full operating range (–40°C to +85°C). |
| Supply Voltage | +5V ±5% - operates reliably within standard digital rail tolerances without auxiliary regulators. |
| Power Dissipation | 75mW (TYP) - low active power supports dense mixed-signal PCB layouts without thermal derating concerns. |
Pinout & Package
MAX154AEWG is housed in a 24-pin Wide SO (Small Outline) package, 7.65mm × 10.33mm body size, 0.65mm lead pitch, RoHS-compliant, with gull-wing leads suitable for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power-supply input | +5V main supply rail; bypass with 47µF electrolytic + 0.1µF ceramic capacitor at pin for stable operation. |
| GND | Ground reference | Analog/digital common return; must be low-impedance connection to minimize noise coupling into ADC core. |
| REF OUT | Internal reference output | 2.5V buffered reference; requires 0.01µF ceramic bypass to GND for stability - larger caps degrade regulation. |
| VREF+ | Upper reference span input | Defines full-scale code (11111111); accepts 2.47V–2.53V or external voltage up to VDD. |
| VREF− | Lower reference span input | Defines zero-code voltage (00000000); tied to GND in unipolar mode, or offset for bipolar configurations. |
| AIN1–AIN4 | Analog input channels | Four single-ended inputs; each exhibits ≤45pF input capacitance and ±3µA leakage - source impedance ≤100Ω required for full accuracy. |
| A0, A1 | Multiplexer address inputs | Select one of four analog channels (00=AIN1, 01=AIN2, 10=AIN3, 11=AIN4); CMOS-compatible logic levels. |
| CS | Chip-select input | Active-low enable; must be low to activate conversion and data output drivers - controls device selection in multi-peripheral buses. |
| RD | Read control input | Active-low; initiates conversion in Mode 0, reads previous result in Mode 1 - defines interface timing and mode selection. |
| INT | Interrupt output | Open-drain, active-low; asserts at conversion completion and deasserts on rising edge of CS or RD - used for interrupt-driven firmware polling. |
| RDY | Ready output | Open-drain, active-low; goes low on CS fall and high-impedance at conversion end - connects directly to µP WAIT input for automatic timing sync. |
| DB0–DB7 | Three-state data outputs | Parallel 8-bit latched outputs; high-impedance when CS high - connect directly to 8-bit data bus without glue logic. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates external TH circuitry - reduces board area, component count, and acquisition path mismatch in multi-channel systems. |
| On-chip 2.5V reference | Drift <100ppm/°C over –40°C to +85°C - enables stable full-scale calibration without trimming or external reference ICs. |
| No external clock required | Self-timed conversion engine - removes clock distribution complexity and jitter sensitivity in synchronous data acquisition. |
| Memory-mapped or I/O-port interface | Appears as memory location or peripheral port without address decoding logic - simplifies µP integration in 8051, Z80, or FPGA-based controllers. |
| Single +5V supply operation | Eliminates dual-rail design constraints - allows direct use in legacy +5V systems without DC/DC converters or LDOs. |
Applications
| Speech Analysis System | High-Speed Servo Control Loop |
|---|---|
Use Scenario: Real-time digitization of eight-band filtered speech signals for feature extraction and voice recognition. IC Role / Device Role / Timing Role: Four-channel ADC capturing bandpass-filtered audio segments at 100kHz/channel with synchronized INT-driven DMA transfers. Use Value: 2.5µs conversion time and built-in track/hold ensure accurate sampling of transient phoneme edges without aperture uncertainty. |
Use Scenario: Closed-loop position feedback in industrial CNC axes using quadrature encoder and analog current sense signals. IC Role / Device Role / Timing Role: Simultaneous sampling of motor phase currents and position error voltage at ≥50kHz update rate. Use Value: ±1/2 LSB error and 0V–5V input range match op-amp output rails, enabling direct interface to current-sense amplifiers without scaling. |
| Telecom Channel Monitoring | DSP-Based Audio Instrumentation |
Use Scenario: In-line monitoring of analog line card voltages and signal integrity metrics across multiple T1/E1 trunk interfaces. IC Role / Device Role / Timing Role: Multiplexed acquisition of DC bias, AC amplitude, and distortion indicators across four test points per card. Use Value: Internal 2.5V reference and single-supply operation eliminate reference drift errors during hot-swap maintenance cycles. |
Use Scenario: Multi-channel audio input stage for digital mixing console with analog preamp outputs feeding ADC front-end. IC Role / Device Role / Timing Role: 8-bit digitization of line-level signals prior to FIR filtering and dynamic range compression in DSP pipeline. Use Value: 200µVrms output noise and 1/2 LSB linearity support >48dB SNR - sufficient for prosumer-grade audio capture before digital gain staging. |
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 |
|---|---|---|---|
| MAX158AEWG | 8-channel variant with identical conversion time, reference, and interface; adds A2 address pin and extra analog inputs. | Supports higher channel density in space-constrained telecom or instrumentation systems where 4-channel count is limiting. | Select MAX158AEWG when expanding from 4 to 8 analog sources without redesigning timing or software interface logic. |
| ADS7822U | 8-bit, 200ksps SAR ADC with SPI interface, no internal reference, requires external 2.5V reference and separate track/hold. | Targets low-power, serial-interface systems where board space and pin count are more critical than parallel bus speed. | Choose ADS7822U for battery-powered or FPGA-adjacent designs needing minimal I/O pins and lower quiescent current (1.5mA vs. 15mA). |
Compared with MAX154AEWG, MAX158AEWG offers doubled channel count with identical timing and accuracy, while ADS7822U trades parallel bus simplicity for serial interface flexibility and lower power - making the former ideal for channel-scaling upgrades and the latter better suited for compact, low-energy signal chains.
Availability
MAX154AEWG is available at Aetrix Electronics and suitable for high-speed data acquisition, real-time servo control, and telecom channel monitoring requiring stable component supply across extended temperature ranges.
Supply support for MAX154AEWG 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, automotive, and communications applications.
The MAX154AEWG belongs to Maxim's high-speed data acquisition product line, engineered specifically for systems requiring fast, accurate, self-contained analog digitization without external support components.
FAQ
What is the operating temperature range of the MAX154AEWG?
The MAX154AEWG is rated for –40°C to +85°C ambient operation, confirmed by its 'E' grade suffix and electrical characterization across that full range in the official datasheet. This makes MAX154AEWG suitable for industrial environments where thermal cycling exceeds commercial-grade limits, and all key specs - including ±1/2 LSB error and 2.5µs conversion time - are guaranteed across this interval.
Does the MAX154AEWG require an external clock signal?
No, the MAX154AEWG does not require an external clock. Its conversion timing is fully self-contained and initiated by control signals (CS and RD), with internal timing circuitry ensuring consistent 2.5µs conversion time per channel. This eliminates clock jitter sensitivity and routing complexity - a key advantage of MAX154AEWG in noise-critical mixed-signal systems.
How does the MAX154AEWG handle analog input settling for accurate conversions?
The MAX154AEWG internally allocates ~1µs for input tracking before latching MS bits, requiring analog source impedance ≤100Ω to achieve full ±1/2 LSB accuracy. Its input model includes 45pF capacitance and comparator switching transients; therefore, MAX154AEWG demands low-Z drivers - such as unity-gain op-amps with >1MHz loop gain - to ensure complete settling within the acquisition window.
Can the MAX154AEWG operate with a reference voltage other than its internal 2.5V?
Yes, the MAX154AEWG supports external reference configurations: VREF+ can accept any voltage from VREF− to VDD (up to +5V), and VREF− can be set above GND for bipolar input ranges. When using external references, the internal REF OUT pin must be left unconnected or decoupled, and MAX154AEWG's accuracy remains specified relative to the applied VREF+–VREF− span.
What digital interface modes does the MAX154AEWG support, and how do they differ?
The MAX154AEWG supports Mode 0 (WAIT-state) and Mode 1 (non-WAIT) interfaces. In Mode 0, RD remains low until conversion completes and data becomes valid; in Mode 1, RD pulse width is short (~2.5µs), reading prior result while starting new conversion. MAX154AEWG's timing diagrams (Figures 5 and 6) define exact setup/hold requirements for each mode - critical for reliable µP or FPGA integration.
MAX154AEWG 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX154AEWG FAQ
1.How can I place an order for MAX154AEWG through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX154AEWG 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 MAX154AEWG reliable?
The price and inventory of MAX154AEWG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX154AEWG is usually 5 days.
3.What payment methods are accepted for MAX154AEWG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX154AEWG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX154AEWG?
MAX154AEWG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX154AEWG 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 MAX154AEWG?
For technical support, including MAX154AEWG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX154AEWG requirements.
6.How does Aetrix verify that MAX154AEWG is sourced from the original manufacturer or authorized distributors?
All MAX154AEWG 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 MAX154AEWG meets industry standards.
7.What is the process for return or replacement of MAX154AEWG?
All MAX154AEWG units undergo pre-shipment inspection (PSI). If there is an issue with MAX154AEWG, 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 MAX154AEWG part is unused and in its original packaging.
Return procedure for MAX154AEWG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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