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Analog Devices Inc./Maxim Integrated MAX155AEWI
- Part No.:
- MAX155AEWI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX155AEWI.pdf
- Description:
- IC ADC 8BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,436
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Product details
Overview
The MAX155AEWI from Maxim Integrated is an 8-channel, 8-bit simultaneous-sampling analog-to-digital converter (ADC) with integrated track/hold amplifiers, 3.6µs per-channel conversion time, 2.5V internal reference, and ±5V dual-supply or +5V single-supply operation - used in phase-sensitive data acquisition and vibration analysis systems.
For engineers reviewing the MAX155AEWI datasheet, MAX155AEWI pinout, MAX155AEWI application, or MAX155AEWI equivalent, this page delivers verified technical context, real-world timing behavior, mixed-mode input configuration support, and supply-flexible operation for high-fidelity multichannel sampling.
Technical Context
The MAX155AEWI implements a successive-approximation ADC core with eight independent track/hold circuits that sample all analog inputs simultaneously on the falling edge of WR. Its internal 8×8 RAM stores results sequentially by channel index, accessed via RD pulses with automatic address incrementing.
Configuration is handled through a shared bidirectional interface (D0–D7), where pins serve as both data outputs and address/control inputs (A0–A2, PD, INH, BIP, DIFF, ALL); mode selection (I/O vs. hard-wired) is determined by the MODE pin state, and bipolar/differential settings take effect on the subsequent conversion cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - guarantees monotonic output with no missing codes across full operating range. |
| Conversion Time | 3.6 µs per channel - enables up to ~220 kSPS aggregate throughput for 8-channel sequences. |
| Input Channels | 8 simultaneous-sampling analog inputs (AIN0–AIN7) - eliminates inter-channel timing skew for coherent waveform capture. |
| Reference | 2.5 V internal reference (REFOUT) - stable, temperature-compensated voltage source requiring 4.7 µF + 0.1 µF bypassing. |
| Supply Range | +5 V single supply or ±5 V dual supply - supports unipolar (0 V to VREF) or bipolar (±VREF) input ranges. |
| Accuracy (MAX15_A Grade) | ±½ LSB integral linearity error - ensures <0.2% full-scale deviation in precision measurement applications. |
| Aperture Matching | 4 ns channel-to-channel aperture delay matching - preserves phase coherence across sampled channels. |
Pinout & Package
The MAX155AEWI is supplied in a 28-pin wide SO (Small Outline) package with 300 mil body width and standard gull-wing leads.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 25–28 | AIN0–AIN7 | Analog input terminals - accept simultaneous sampling; support single-ended or differential configurations per channel. |
| 5 | MODE | Mode select - open-circuit enables I/O configuration mode; tied low/high with VSS selects hard-wired 8-/4-channel modes. |
| 6 | VSS | Negative supply - connect to AGND (0 V) for unipolar operation or -5 V for extended bipolar input range. |
| 7 | CS | Chip select - must be low for WR/RD commands to be recognized; enables multi-device bus sharing. |
| 8–9 | RD / WR | Read and write control - RD pulses access RAM sequentially; WR rising edge updates config register, falling edge triggers sampling. |
| 10 | BUSY | Active-low status indicator - signals conversion in progress; goes high when all selected channel results are stored in RAM. |
| 11 | CLK | External clock input - accepts 0.5–5 MHz clock; determines conversion timing and acquisition window (tACQ ≥ 800 ns). |
| 12–20 | D7/ALL – D0/A0 | Bidirectional data/address/control - function depends on context: data output during RD, address/config input during WR. |
| 21–22 | REFOUT / REFIN | Reference output/input - REFOUT = 2.5 V ±60 mV (TA = -40°C to +85°C); REFIN accepts 2.375–2.625 V external reference. |
| 23–24 | AGND / VDD | Analog ground and +5 V power - separate AGND/DGND routing required for optimal noise immunity and accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous track/hold sampling | Eight independent T/H circuits sample AIN0–AIN7 at identical instants - critical for phase-coherent multi-sensor acquisition. |
| Mixed-input configuration flexibility | Per-channel selection of unipolar/bipolar and single-ended/differential modes - enables heterogeneous sensor interfacing in one device. |
| Configurable conversion sequencing | Supports both single-channel (ALL = 1) and multichannel (ALL = 0) reads - allows selective data retrieval without full RAM sweep. |
| Power-down retention | Writes to PD bit reduce supply current to ≤100 µA while preserving configuration register contents - ideal for battery-powered logging intervals. |
| Hard-wired mode simplicity | MODE + VSS pin strapping selects fixed 8-channel SE/unipolar, 4-channel diff/unipolar, or bipolar variants - eliminates firmware setup overhead. |
Applications
| Phase-Sensitive Data Acquisition | Vibration and Waveform Analysis |
|---|---|
Use Scenario: Capturing synchronized voltage/current waveforms from multiple transducers in motor drive feedback loops. IC Role / Device Role / Timing Role: Simultaneous sampling ADC with matched aperture delay ensures sub-degree phase alignment between channels. Use Value: Enables accurate FFT-based harmonic analysis and real-time vector control without inter-channel timing correction. |
Use Scenario: Monitoring mechanical resonance in rotating equipment using accelerometer and strain gauge arrays. IC Role / Device Role / Timing Role: High-speed 8-channel digitizer capturing transient vibration bursts with deterministic latency and minimal skew. Use Value: Preserves time-domain integrity of shock events for envelope detection and bearing fault signature extraction. |
| DSP Analog Input Interface | AC Power Metering |
Use Scenario: Feeding real-time sampled data to a fixed-point DSP for adaptive filtering and spectral estimation. IC Role / Device Role / Timing Role: RAM-buffered ADC with burst-read capability via consecutive RD pulses - matches DSP DMA burst requirements. Use Value: Eliminates CPU polling overhead and provides deterministic data delivery timing for pipeline-optimized algorithms. |
Use Scenario: Measuring voltage, current, and neutral conductor signals in Class 0.5 three-phase energy meters. IC Role / Device Role / Timing Role: Bipolar ±2.5 V input range with internal reference supports direct connection to current transformer secondaries. Use Value: Delivers consistent gain/offset performance across temperature (-40°C to +85°C) without external calibration components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7865-1ASTZ | 4-channel, 14-bit, 3.6 µs conversion; requires external reference and separate T/H; SPI interface. | Higher resolution but fewer channels; lacks integrated T/H and internal reference - increases BOM count and layout complexity. | Choose when >12-bit resolution is mandatory and channel count ≤4; avoid if simultaneous 8-channel sampling is required. |
| ADS8588HIPM | 8-channel, 16-bit, 2.8 µs conversion; integrated T/H; external reference only; parallel + SPI interface. | Superior resolution and speed, but no internal reference and higher supply voltage (5 V + 12 V); not drop-in compatible. | Prefer for high-accuracy industrial DAQ where external reference stability and 16-bit fidelity outweigh added power and layout constraints. |
Compared with AD7865-1ASTZ and ADS8588HIPM, the MAX155AEWI uniquely combines 8-channel simultaneous sampling, internal 2.5 V reference, and single +5 V operation in a compact SO package - reducing system-level component count and simplifying power design for cost-sensitive embedded measurement.
Availability
MAX155AEWI is available at Aetrix Electronics and suitable for phase-sensitive data acquisition, vibration monitoring, DSP front-end interfaces, and AC power metering requiring stable component supply across industrial temperature ranges.
Supply support for MAX155AEWI 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, medical, and communications applications.
The MAX155AEWI belongs to Maxim's high-speed data acquisition product line, engineered specifically for multichannel, time-coherent sampling in instrumentation and control systems where channel-to-channel timing alignment is critical.
FAQ
What is the guaranteed operating temperature range for the MAX155AEWI?
The MAX155AEWI is specified for operation from -40°C to +85°C (E-grade). This extended industrial temperature range ensures reliable performance in harsh environments such as motor control cabinets, outdoor power meters, and factory-floor data loggers where ambient temperatures exceed commercial limits. The MAX155AEWI maintains its ±½ LSB integral linearity and 4 ns aperture matching across this full range.
Can the MAX155AEWI operate with only a +5V supply, or is a negative rail always required?
The MAX155AEWI operates fully with a single +5V supply (VDD = +5V, VSS = AGND) for unipolar input ranges (0 V to +2.5 V). A -5V VSS rail is optional and only needed when bipolar input operation (±2.5 V) is required - for example, when interfacing with AC-coupled sensors or current transformers. No negative supply is necessary for standard unipolar applications.
How does the MAX155AEWI handle channel configuration changes during continuous conversion sequences?
The MAX155AEWI applies unipolar/bipolar (BIP) and single-ended/differential (DIFF) settings on the *next* conversion after they are written - not the current one. To avoid unintended mode transitions, users must either write new BIP/DIFF values with INH = 1 (inhibit conversion), then follow with INH = 0, or schedule mode changes one conversion cycle ahead. This behavior is explicitly documented in the MAX155AEWI datasheet timing section.
Is the internal 2.5V reference of the MAX155AEWI usable as a precision voltage source for external circuitry?
No - the MAX155AEWI's REFOUT pin is designed solely as a reference for the internal ADC and is not characterized for driving external loads beyond its specified 30 mA sink/source capability. Its output voltage has ±60 mV tolerance over temperature and exhibits load regulation error (±10 mV at 10 mA). For external referencing, use a dedicated precision voltage reference IC instead of relying on REFOUT.
What happens to the configuration register and RAM contents during power-down mode of the MAX155AEWI?
When the MAX155AEWI enters power-down mode (PD = 1), the configuration register contents - including channel selections, BIP/DIFF settings, and ALL mode - are retained, and RAM data remains intact. However, no conversions can be initiated and no data can be read from RAM until PD is cleared (PD = 0). Upon exit from power-down, the internal 2.5 V reference requires up to 5 ms to stabilize before valid conversions resume - unless an external reference is used and kept active.
MAX155AEWI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-MUX-ADC
- Ratio - S/H:ADC:
- 8:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- ±5V, 5V
- Voltage - Supply, Digital:
- ±5V, 5V
- Features:
- Selectable Address, Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX155AEWI FAQ
1.How can I place an order for MAX155AEWI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX155AEWI 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 MAX155AEWI reliable?
The price and inventory of MAX155AEWI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX155AEWI is usually 5 days.
3.What payment methods are accepted for MAX155AEWI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX155AEWI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX155AEWI?
MAX155AEWI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX155AEWI 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 MAX155AEWI?
For technical support, including MAX155AEWI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX155AEWI requirements.
6.How does Aetrix verify that MAX155AEWI is sourced from the original manufacturer or authorized distributors?
All MAX155AEWI 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 MAX155AEWI meets industry standards.
7.What is the process for return or replacement of MAX155AEWI?
All MAX155AEWI units undergo pre-shipment inspection (PSI). If there is an issue with MAX155AEWI, 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 MAX155AEWI part is unused and in its original packaging.
Return procedure for MAX155AEWI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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