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Analog Devices Inc./Maxim Integrated MAX158BEWI+
- Part No.:
- MAX158BEWI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX158BEWI+.pdf
- Description:
- IC ADC 8BIT 8CH W/MUX&REF 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,637
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Product details
Overview
The MAX158BEWI+ from Maxim Integrated is an 8-bit, 8-channel high-speed analog-to-digital converter (ADC) with integrated track/hold, on-chip 2.5V reference, and single +5V supply operation. It delivers 2.5µs per-channel conversion time, supports 0V to +5V analog input range, and interfaces directly to microprocessor data buses via latched three-state outputs. It is used in real-time speech analysis, high-speed servo control, and telecommunications data acquisition systems.
For engineers reviewing the MAX158BEWI+ datasheet, MAX158BEWI+ pinout, MAX158BEWI+ application, or MAX158BEWI+ equivalent, key selection considerations include its 8-channel multiplexed architecture, ±1 LSB total unadjusted error at –40°C to +85°C, SSOP-28 package footprint, and Mode 0/Mode 1 digital interface flexibility for WAIT-capable or WAIT-free microprocessor systems.
Technical Context
The MAX158BEWI+ employs a half-flash conversion architecture with two 4-bit flash ADC sections and an internal DAC to generate the full 8-bit result in 2.5µs. Its analog front-end includes a built-in track/hold and accepts up to eight differential-capable single-ended inputs routed via A0–A2 address lines.
Digital interfacing relies solely on CS and RD control signals, supporting two modes: Mode 0 (WAIT-state extension, INT- and RDY-driven) and Mode 1 (non-WAIT, pipelined read of prior result). The device uses open-drain RDY and active-low INT outputs, with latched three-state DB0–DB7 outputs compatible with standard 8-bit data buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - provides 256 discrete output codes for digitizing analog signals within 0V to +5V range |
| Conversion Time | 2.5 µs per channel - enables up to 400 kHz aggregate sampling rate (tCRD + tp = 2.5 µs) |
| Total Unadjusted Error | ±1 LSB - specifies worst-case deviation including offset, gain, and linearity errors over temperature |
| Analog Input Channels | 8-channel single-ended multiplexer - selected via A0/A1/A2 address inputs; no external MUX required |
| Reference | Internal 2.5V ±0.03V (±1.2%) - eliminates need for external reference; REF OUT drives ≤10mA load |
| Supply Voltage | +5V ±5% - operates from single rail; IDD = 15 mA typical, enabling low-power system integration |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded applications without derating |
Pinout & Package
MAX158BEWI+ is housed in a 28-pin Wide SO (SOIC-W) package, 7.65 mm × 10.33 mm body size, 1.27 mm pitch, with gull-wing leads. Pin 1 marked by beveled corner; pin 14 is GND, pin 28 is VDD.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN8 | Analog input channels | Single-ended voltage inputs (0V to +5V); internally sampled via 31-comparator array during track phase |
| A0, A1, A2 | Multiplexer address inputs | Select one of eight analog channels; latched on falling edge of CS/RD in Mode 0 or Mode 1 |
| CS | Chip-select input | Active-low enable; initiates address latching and conversion start when asserted with RD |
| RD | Read control input | Active-low; controls conversion trigger and data bus access timing; determines Mode 0 vs. Mode 1 behavior |
| DB0–DB7 | Three-state digital outputs | Latched 8-bit parallel data bus interface; high-impedance when CS or RD high; direct connection to µP data bus |
| INT | Interrupt output | Active-low open-collector signal; asserts ~600 ns after conversion completion; resets on rising edge of CS or RD |
| RDY | Ready output | Open-drain status signal; pulled low on CS fall, returns high-impedance at conversion end; connects to µP WAIT input |
| VREF+, VREF− | Reference span terminals | Define zero-code (VREF−) and full-scale (VREF+) voltages; support external reference or internal 2.5V REF OUT |
| REF OUT | 2.5V reference output | Buffered internal reference; 2.47V–2.53V at +25°C; requires 0.01 µF bypass to GND for stability |
| VDD, GND | Power supply pins | +5V supply (4.75V–5.25V) and ground return; require 47 µF + 0.1 µF local bypassing |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates external TH circuitry; enables accurate sampling of signals up to 157 mV/µs slew rate without external hold capacitor |
| On-chip 2.5V reference | Stable ±100 ppm/°C drift; 2.5V ±0.03V output; reduces BOM count and layout area versus discrete reference solutions |
| Microprocessor-compatible interface | No external logic required; appears as memory-mapped I/O location; supports both WAIT and non-WAIT µP architectures |
| Half-flash conversion architecture | Uses 15 MSB + 15 LSB comparators and internal DAC; achieves 8-bit accuracy with 2.5 µs latency and low power consumption |
| Industrial temperature grade | Specified for –40°C to +85°C operation; ±1 LSB error maintained across full range; suitable for harsh-environment data loggers |
Applications
| Speech Analysis Systems | High-Speed Servo Control |
|---|---|
Use Scenario: Real-time digitization of 8-band filtered audio signals from microphone arrays for voice recognition or spectral analysis. IC Role / Device Role / Timing Role: 8-channel simultaneous-sampling ADC providing synchronized 8×10 kHz sample streams with <2.5 µs inter-channel skew. Use Value: Enables deterministic multi-channel capture without external sample-hold; internal 2.5V reference ensures consistent scaling across all bands. |
Use Scenario: Closed-loop position/velocity feedback in industrial motion controllers requiring sub-µs timing determinism. IC Role / Device Role / Timing Role: High-speed analog sensor interface converting encoder analog outputs or current-sense signals into 8-bit digital feedback. Use Value: 2.5 µs conversion time supports >100 kHz servo loop rates; Mode 1 pipelining allows continuous data streaming without µP WAIT insertion. |
| Telecom Channel Monitoring | Digital Signal Processing Front-End |
Use Scenario: Monitoring of multiple analog line cards (e.g., POTS, DSL, T1/E1 analog sections) for signal integrity and fault detection. IC Role / Device Role / Timing Role: Multi-channel ADC scanning up to eight line interfaces sequentially with programmable channel addressing (A0–A2). Use Value: Single-chip solution replaces discrete MUX + ADC combinations; internal reference ensures stable threshold detection across temperature. |
Use Scenario: Digitizing sensor or transducer outputs (e.g., accelerometers, pressure sensors) feeding fixed-point DSP algorithms. IC Role / Device Role / Timing Role: Precision 8-bit data acquisition engine delivering time-aligned samples to DSP memory via parallel bus. Use Value: ±1 LSB error and 0.157 V/µs slew rate support accurate representation of fast transient events; 3-state outputs prevent bus contention during DMA transfers. |
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 | 12-bit resolution, SPI interface, 2.5 µs conversion, but single-channel only; requires external MUX for 8-channel use | Not suitable for space-constrained 8-channel parallel-bus systems; better for low-pin-count, higher-resolution SPI-based designs | Select if resolution >8-bit is required and serial interface acceptable; avoid if parallel bus or integrated MUX needed. |
| MAX11131ETE+ | 8-bit, 8-channel, SPI interface, 1.5 µs conversion, internal reference, but –40°C to +125°C grade and TQFN-16 package | Smaller footprint and faster conversion, but lacks parallel bus interface and RDY/INT handshaking for µP WAIT integration | Choose for compact, high-density PCBs with SPI host; not drop-in for legacy 8-bit data bus µP systems using MAX158BEWI+. |
Compared with ADS7822U and MAX11131ETE+, the MAX158BEWI+ uniquely combines 8-channel multiplexing, parallel 8-bit bus interface, RDY/INT handshaking, and industrial temperature rating in a single SOIC-W package-making it optimal for legacy µP-based data acquisition where board space and interface compatibility are critical.
Availability
MAX158BEWI+ is available at Aetrix Electronics and suitable for high-speed servo control, telecom channel monitoring, and speech analysis systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX158BEWI+ 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 MAX154/MAX158 product line was engineered specifically for high-speed, multi-channel data acquisition in resource-constrained embedded systems-emphasizing integration (MUX + TH + REF), µP bus compatibility, and robust industrial temperature performance.
FAQ
What is the maximum sampling rate achievable with the MAX158BEWI+?
The MAX158BEWI+ achieves a maximum aggregate sampling rate of 400 kHz, calculated as 1/(tCRD + tp) = 1/(2.5 µs + 0.5 µs). This allows up to 50 kHz per channel when all eight inputs are cycled, satisfying Nyquist requirements for 10 kHz bandwidth signals. The MAX158BEWI+ does not require external clocking-the conversion timing is internally generated upon CS/RD assertion.
Does the MAX158BEWI+ require an external track/hold circuit?
No, the MAX158BEWI+ integrates a complete track/hold function, eliminating the need for external components. Its internal track/hold supports input slew rates up to 0.157 V/µs, enabling accurate sampling of signals up to 10 kHz without external hold capacitors or amplifiers-directly reducing system cost and board area.
How does the MAX158BEWI+ interface with a microprocessor that lacks WAIT-state capability?
The MAX158BEWI+ supports Mode 1 operation for non-WAIT µPs: a single CS/RD assertion simultaneously initiates conversion and reads the previous result from DB0–DB7. A second READ is required to retrieve the new result, with ≥2.5 µs delay between operations. This pipelined behavior makes the MAX158BEWI+ compatible with modern microcontrollers lacking dedicated WAIT inputs.
What is the purpose of the RDY and INT pins on the MAX158BEWI+?
RDY is an open-drain ready signal tied to the µP's WAIT input-it pulls low when CS falls and goes high-impedance at conversion completion, extending instruction cycles automatically. INT is an active-low interrupt indicating conversion finish (~600 ns after start); it resets on rising edges of CS or RD. Both signals enable deterministic timing control in real-time systems using the MAX158BEWI+.
Can the MAX158BEWI+ operate with an external reference instead of the internal 2.5V source?
Yes-the MAX158BEWI+ accepts external references via VREF+ and VREF− pins. When using an external reference, the internal 2.5V REF OUT is disabled. The device maintains full 8-bit performance with external references spanning VREF− to VDD (up to +5V), allowing flexible scaling-for example, 0V to +4.096V full-scale for direct match to 12-bit DACs or digital logic thresholds.
MAX158BEWI+ 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:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 400k
- Number of Inputs:
- 8
- 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:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX158BEWI+ FAQ
1.How can I place an order for MAX158BEWI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX158BEWI+ 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 MAX158BEWI+ reliable?
The price and inventory of MAX158BEWI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX158BEWI+ is usually 5 days.
3.What payment methods are accepted for MAX158BEWI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX158BEWI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX158BEWI+?
MAX158BEWI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX158BEWI+ 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 MAX158BEWI+?
For technical support, including MAX158BEWI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX158BEWI+ requirements.
6.How does Aetrix verify that MAX158BEWI+ is sourced from the original manufacturer or authorized distributors?
All MAX158BEWI+ 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 MAX158BEWI+ meets industry standards.
7.What is the process for return or replacement of MAX158BEWI+?
All MAX158BEWI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX158BEWI+, 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 MAX158BEWI+ part is unused and in its original packaging.
Return procedure for MAX158BEWI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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