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Analog Devices Inc./Maxim Integrated MAX158BCAI+
- Part No.:
- MAX158BCAI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX158BCAI+.pdf
- Description:
- IC ADC 8BIT FLASH 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,352
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Product details
Overview
MAX158BCAI+ from Maxim Integrated is an 8-bit, 8-channel high-speed analog-to-digital converter (ADC) with integrated track/hold, 2.5V on-chip reference, 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. It is used in real-time speech analysis and multi-channel data acquisition systems.
For engineers reviewing the MAX158BCAI+ datasheet, MAX158BCAI+ pinout, MAX158BCAI+ application, or MAX158BCAI+ equivalent, this page delivers verified electrical parameters, SSOP-28 package mapping, digital interface timing modes (Mode 0/1), and validated alternative ADCs for multi-channel 8-bit sampling at ≤400kHz aggregate rate.
Technical Context
The MAX158BCAI+ employs a half-flash architecture with two 4-bit flash ADC sections and an internal DAC to generate 8-bit results using 31 comparators. Its analog input stage includes a built-in track/hold, eliminating external components while supporting up to 157mV/µs input slew rates.
Digital control uses only CS and RD signals, supporting two interface modes: Mode 0 (WAIT-state compatible, INT- and RDY-driven) and Mode 1 (non-WAIT, pipelined read of prior result). The device latches multiplexer address bits A0–A2 to select among eight analog inputs and outputs data on DB0–DB7 with programmable three-state control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes for precise quantization of analog sensor or signal chain outputs. |
| Conversion Time | 2.5µs per channel - enables up to 400kHz aggregate sampling (e.g., 50kHz per channel across all 8 inputs). |
| Analog Input Range | 0V to +5V - matches standard industrial and telecom signal levels without external level-shifting circuitry. |
| Reference | Internal 2.5V ±0.03V (±1.2%) - provides stable, self-contained reference for repeatable full-scale accuracy without external voltage sources. |
| Supply Voltage | +5V ±5% - operates from standard logic rail, eliminating need for auxiliary supplies or regulators. |
| Total Unadjusted Error | ±1 LSB - ensures monotonicity and no missing codes across temperature (0°C to +70°C operating range). |
| Digital Interface | CS + RD control only - simplifies MPU interfacing; supports memory-mapped or I/O-port access without glue logic. |
Pinout & Package
MAX158BCAI+ is housed in a 28-pin Shrink Small-Outline Package (SSOP) with 0.65mm lead pitch, footprint-compatible with industry-standard SOIC-28 but 30% smaller. Pin 1 is marked by a beveled corner; package dimensions are 10.33mm × 5.38mm × 1.99mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN8 | Analog input channels | Eight single-ended inputs; selected via A0–A2 address lines; each supports 0V–5V range with ±3µA max input current. |
| A0, A1, A2 | Multiplexer address inputs | Binary-encoded selection of one of eight analog inputs; latched on falling edge of CS/RD in Mode 0 or Mode 1. |
| DB0–DB7 | Three-state digital output bus | Latched 8-bit parallel data outputs; high-impedance when CS high or RD inactive; directly connectable to 8-bit MPU data bus. |
| CS | Chip-select input | Active-low enable; initiates address latching and conversion start when asserted with RD. |
| RD | Read control input | Active-low signal controlling conversion trigger and data access; determines Mode 0 (WAIT) or Mode 1 (pipelined) operation. |
| INT | Interrupt output | Open-drain active-low flag signaling end of conversion; used to synchronize MPU read cycles. |
| RDY | Ready output | Open-drain status signal tied to MPU WAIT input; goes low on CS assertion and high-impedance at conversion completion. |
| VREF+, VREF− | Reference span terminals | Define zero-code (VREF−) and full-scale (VREF+) voltages; support internal 2.5V REF OUT or external reference configurations. |
| REF OUT | 2.5V reference output | Buffered on-chip 2.5V source (±10mV load regulation); requires 0.01µF bypass capacitor for stability. |
| VDD, GND | Power supply pins | +5V supply and ground; require 47µF electrolytic + 0.1µF ceramic bypassing at VDD to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates external TH circuitry and associated board space, cost, and timing calibration effort. |
| On-chip 2.5V reference | Provides stable, factory-trimmed reference without external precision voltage source or resistor divider. |
| No external clock required | Self-timed conversion engine removes need for external clock generator or synchronization logic. |
| Single +5V supply operation | Reduces power system complexity by avoiding dual-rail or regulated auxiliary supplies. |
| Two digital interface modes | Supports both WAIT-capable (Mode 0) and non-WAIT (Mode 1) microprocessors without hardware redesign. |
| SSOP-28 package | Enables high-density PCB layouts with 30% smaller footprint than SOIC-28 while maintaining hand-solderability. |
Applications
| Speech Analysis System | Multi-Channel Telecom Monitoring |
|---|---|
Use Scenario: Real-time digitization of 8-band filtered speech signals for voice coding and feature extraction. IC Role / Device Role / Timing Role: 8-channel simultaneous sampling ADC providing synchronized 8×50kHz streams to DSP core. Use Value: Built-in track/hold and 2.5µs conversion ensure phase-coherent capture across all bands without inter-channel skew. |
Use Scenario: Monitoring analog line states (voltage, current, ring detection) across eight PSTN subscriber lines. IC Role / Device Role / Timing Role: Centralized analog front-end ADC scanning multiple lines in round-robin fashion at 100Hz per channel. Use Value: Single +5V operation and integrated reference reduce BOM count and improve long-term drift stability in telco cabinets. |
| Industrial Servo Feedback | Audio Instrumentation Sampling |
Use Scenario: Closed-loop position/velocity feedback from eight motor encoders or resolvers in motion control rack. IC Role / Device Role / Timing Role: High-speed ADC capturing analog feedback signals for real-time PID computation. Use Value: 2.5µs conversion time enables sub-10µs loop latency, critical for high-bandwidth servo response. |
Use Scenario: Multi-track audio signal conditioning in test equipment requiring simultaneous sampling of 8 analog inputs. IC Role / Device Role / Timing Role: Precision 8-bit digitizer for spectral analysis, THD measurement, and waveform capture. Use Value: ±1 LSB error and 1/2LSB linearity guarantee accurate amplitude fidelity for calibrated instrumentation use. |
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 | 2.4µs conversion, SPI interface, 2.7V–5.25V supply, no internal reference | Requires external reference and serial interface logic; better suited for low-power portable designs | Select when serial interface and wider supply range outweigh need for integrated reference and parallel bus simplicity. |
| MAX1113ECM+ | 8-channel, 10-bit resolution, 3.5µs conversion, internal 2.048V reference, +3V/+5V supply | Higher resolution but slower speed; optimized for precision over speed in battery-powered systems | Choose when 10-bit accuracy is mandatory and 2.5µs timing is not critical-e.g., sensor data loggers. |
Compared with MAX158BCAI+, ADS7822U trades parallel simplicity for serial flexibility and lower power, while MAX1113ECM+ sacrifices speed for 2 extra bits of resolution and dual-supply operation-neither offers identical pinout or drop-in replacement capability.
Availability
MAX158BCAI+ is available at Aetrix Electronics and suitable for high-speed data acquisition, telecommunications monitoring, and real-time speech analysis requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX158BCAI+ 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 MAX154/MAX158 family was engineered specifically for compact, high-throughput data acquisition systems needing integrated signal conditioning-delivering complete 8-bit ADC functionality in minimal board space with no external support components.
FAQ
What is the operating temperature range for MAX158BCAI+?
The MAX158BCAI+ is rated for 0°C to +70°C ambient operation, as indicated by the 'C' suffix in its ordering code. This commercial-grade temperature range suits indoor industrial control panels, telecom line cards, and benchtop instrumentation where environmental extremes are controlled. The device maintains ±1 LSB total unadjusted error across this full range without derating.
Does MAX158BCAI+ require an external clock signal?
No, MAX158BCAI+ does not require an external clock. Its conversion timing is fully self-contained using internal timing circuitry triggered by CS and RD control edges. This eliminates clock distribution challenges, jitter sensitivity, and external oscillator BOM cost-making it ideal for systems where clock resources are constrained or noise-sensitive.
Can MAX158BCAI+ operate with an external reference instead of the internal 2.5V source?
Yes, MAX158BCAI+ supports external reference configurations. By connecting a precision voltage source between VREF+ and VREF−, users can set custom full-scale ranges (e.g., 0V to 4.096V for 1mV/LSB scaling). The internal 2.5V REF OUT remains functional but should be left unconnected or decoupled with 0.01µF if unused-ensuring flexibility for metrology-grade applications.
How does the Mode 0 vs. Mode 1 interface differ in practice for MAX158BCAI+?
In Mode 0, MAX158BCAI+ asserts RDY to hold the MPU in WAIT state until conversion completes, then presents valid data on DB0–DB7. In Mode 1, the first RD pulse reads the prior conversion result while launching the next, requiring strict 2.5µs inter-read timing. Mode 0 suits Z80/8086-style CPUs; Mode 1 fits faster processors like ARM7 or PIC where WAIT insertion is undesirable.
What is the maximum recommended source impedance for analog inputs on MAX158BCAI+?
MAX158BCAI+ specifies ≤100Ω maximum source impedance for analog inputs to ensure full 2.5µs conversion accuracy. Higher impedances cause incomplete settling of the internal 45pF input capacitance through the multiplexer's ~600Ω on-resistance, leading to gain and linearity errors. For high-Z sensors, a unity-gain buffer with <100Ω output impedance (e.g., MAX44268) must precede the AIN pins.
MAX158BCAI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX158BCAI+ FAQ
1.How can I place an order for MAX158BCAI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX158BCAI+ 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 MAX158BCAI+ reliable?
The price and inventory of MAX158BCAI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX158BCAI+ is usually 5 days.
3.What payment methods are accepted for MAX158BCAI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX158BCAI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX158BCAI+?
MAX158BCAI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX158BCAI+ 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 MAX158BCAI+?
For technical support, including MAX158BCAI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX158BCAI+ requirements.
6.How does Aetrix verify that MAX158BCAI+ is sourced from the original manufacturer or authorized distributors?
All MAX158BCAI+ 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 MAX158BCAI+ meets industry standards.
7.What is the process for return or replacement of MAX158BCAI+?
All MAX158BCAI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX158BCAI+, 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 MAX158BCAI+ part is unused and in its original packaging.
Return procedure for MAX158BCAI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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