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Analog Devices Inc./Maxim Integrated MAX158BCWI+
- Part No.:
- MAX158BCWI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX158BCWI+.pdf
- Description:
- IC ADC 8BIT FLASH 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,807
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Product details
Overview
MAX158BCWI+ 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. Used in real-time speech analysis and high-speed servo control systems.
For engineers reviewing the MAX158BCWI+ datasheet, MAX158BCWI+ pinout, MAX158BCWI+ application, or MAX158BCWI+ equivalent, this page delivers verified electrical parameters, SSOP-28 package mapping, Mode 0/Mode 1 interface timing behavior, and validated alternative ADCs for multi-channel data acquisition designs requiring ≤2.5µs latency and ±1 LSB accuracy.
Technical Context
The MAX158BCWI+ employs a half-flash architecture with two 4-bit flash sections and a 4-bit DAC to generate full 8-bit results using 31 comparators. Its internal track/hold eliminates external components, and conversion is initiated by CS/RD edge timing - not an external clock.
Digital interface supports two modes: Mode 0 (WAIT-state compatible, RD held low until conversion completes) and Mode 1 (non-WAIT, overlapping read/conversion with 2.5µs inter-conversion delay). INT signals completion; RDY provides open-drain READY handshake to microprocessor WAIT inputs.
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 rate (8 channels × 50kHz/channel), sufficient for 10kHz input bandwidth per Nyquist. |
| Analog Input Range | 0V to +5V - matches standard TTL/CMOS logic swing and simplifies front-end conditioning when referenced to VREF− = GND. |
| Reference Output | 2.50V ±3mV (TYP) - stable internal reference eliminates need for external precision voltage source; load-regulated to ±10mV at 10mA. |
| Total Unadjusted Error | ±1 LSB - includes offset, gain, and linearity errors; ensures monotonic transfer function and no missing codes across full range. |
| Supply Voltage | +5V ±5% - operates within standard digital rail tolerance; power dissipation is 75mW typical at +25°C. |
| Operating Temperature | 0°C to +70°C - commercial-grade rating suitable for industrial control panels and telecom line cards without extended thermal management. |
Pinout & Package
MAX158BCWI+ is housed in a 28-pin Shrink Small-Outline Package (SSOP) with 0.65mm lead pitch, 5.6mm × 10.2mm body size, and exposed pad not electrically connected. Pin 1 is marked by notch or dot; pin numbering follows standard counterclockwise sequence from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN8 | Analog input channels | Eight single-ended inputs selectable via A0/A1/A2 address lines; each presents 45pF capacitance and ±3µA leakage, requiring <100Ω source impedance for full settling. |
| DB0–DB7 | Three-state digital output bus | Latched parallel data outputs (LSB to MSB); high-impedance when CS or RD is high, enabling direct connection to 8-bit microprocessor data bus without transceivers. |
| CS | Chip-select input | Active-low enable: falling edge latches A0/A1/A2 and initiates conversion; must be held low during Mode 0 access or pulse low for Mode 1 operation. |
| RD | Read control input | Controls conversion start and data access timing; length determines interface mode (Mode 0: long pulse; Mode 1: short pulse with 2.5µs minimum spacing). |
| INT | Interrupt output | Open-drain active-low signal indicating conversion completion; returns high on rising edge of CS or RD - used for interrupt-driven firmware polling. |
| RDY | Ready output | Open-drain status signal tied to microprocessor WAIT input; goes low on CS fall and high-impedance at conversion end - eliminates need for external WAIT logic. |
| VREF+, VREF− | Reference span terminals | Define zero-code (VREF−) and full-scale (VREF+) voltages; support internal 2.5V reference or external reference up to VDD; require 0.01µF bypass to GND. |
| REF OUT | 2.5V reference output | Buffered 2.5V source for external circuitry; specified at 2.47V–2.53V, ±6mV load regulation, and 60ppm/°C drift - usable as precision bias for op-amp front ends. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates external THS component and associated layout complexity; achieves full 8-bit settling in ≤1µs with internal 1µs tracking window. |
| On-chip 2.5V reference | Reduces BOM count and PCB area; eliminates calibration dependency on external reference drift and noise - critical for portable instrumentation. |
| No external clock required | Internal timing generator synchronizes conversion to CS/RD edges - removes clock distribution skew and jitter concerns in mixed-signal systems. |
| Memory-mapped or I/O-port interface | Appears as memory location or peripheral port without glue logic; simplifies FPGA/CPLD interfacing and reduces gate count in custom controller designs. |
| SSOP-28 package | 40% smaller footprint than 28-pin DIP; compatible with automated SMT assembly and reflow profiles; thermal resistance θJA = 95°C/W enables operation at 70°C ambient without heatsink. |
Applications
| Speech Analysis System | High-Speed Servo Control Loop |
|---|---|
Use Scenario: Real-time digitization of 8-band filtered audio signals from microphone array for voice activity detection and spectral feature extraction. IC Role / Device Role / Timing Role: Simultaneous sampling of 8 analog bandpass filter outputs with deterministic 2.5µs per-channel latency and synchronized INT assertion. Use Value: Enables frame-based DSP processing at 50kHz/channel without external multiplexing delays or hold capacitor droop errors. |
Use Scenario: Closed-loop position feedback in CNC motion controllers where motor phase currents and encoder signals must be sampled at ≥20kHz per axis. IC Role / Device Role / Timing Role: 8-channel ADC capturing current sense, hall-effect, and resolver signals with sub-µs channel-to-channel skew and repeatable conversion timing. Use Value: Supports deterministic PID execution within 50µs control cycle - meeting IEC 61800-3 functional safety timing constraints for Class 1 drives. |
| Telecom Line Card Monitoring | Digital Signal Processing Front End |
Use Scenario: Supervisory monitoring of 8 analog line interface unit (LIU) parameters including battery feed voltage, loop current, and tip/ring AC levels. IC Role / Device Role / Timing Role: High-accuracy DC and low-frequency AC measurement using internal 2.5V reference and ±1 LSB error spec over 0°C to +70°C. Use Value: Eliminates need for external reference IC and calibration trimmers - reducing test time and field failure modes in carrier-grade equipment. |
Use Scenario: Digitizing outputs of anti-aliasing filters prior to FFT-based spectrum analysis in RF test equipment and software-defined radio receivers. IC Role / Device Role / Timing Role: 8-bit ADC providing 10kHz input bandwidth with 200µVRMS output noise and 0.157V/µs slew rate capability - preserving SNR for baseband signal integrity. Use Value: Delivers >48dB SNR at 10kHz without external track/hold, enabling cost-effective wideband signal capture in portable analyzers. |
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, 2.5µs conversion, no internal reference - requires external 2.5V ref and level-shifting for 5V µP buses. | Better resolution but serial interface increases firmware overhead; lacks parallel bus compatibility and built-in track/hold. | Select when higher resolution outweighs parallel interface convenience and board space is constrained. |
| MAX11131ETE+ | 12-bit, 8-channel, SPI, internal 4.096V ref, 1.5µs conversion, 2.7V–3.6V supply only - incompatible with +5V systems. | Lower power (3.5mW) and faster conversion, but requires level translation and cannot replace MAX158BCWI+ in legacy +5V designs. | Choose for new battery-powered instrumentation where 3.3V operation and SPI are acceptable. |
Compared with ADS7822U and MAX11131ETE+, the MAX158BCWI+ uniquely combines +5V parallel-bus compatibility, integrated track/hold, and on-chip 2.5V reference - making it irreplaceable in retrofitting legacy industrial controllers without redesigning interface logic or power domains.
Availability
MAX158BCWI+ is available at Aetrix Electronics and suitable for high-speed data acquisition, telecom line monitoring, and real-time servo control applications requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX158BCWI+ 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 and mixed-signal ICs for industrial, automotive, and communications markets, with emphasis on integration, reliability, and power efficiency.
The MAX158BCWI+ belongs to Maxim's high-speed data acquisition product line, engineered specifically for systems needing fast, accurate, multi-channel digitization without external timing or reference components.
FAQ
What is the maximum sampling rate achievable with MAX158BCWI+ in an 8-channel configuration?
The MAX158BCWI+ achieves a maximum aggregate sampling rate of 400kHz, calculated as 1/(tCRD + tP) = 1/(2.5µs + 0.5µs). This allows 50kHz per channel across all eight inputs - sufficient for 10kHz analog bandwidth per Nyquist criterion. The rate is fixed by internal timing and does not depend on external clock frequency since no external clock is required for MAX158BCWI+ operation.
Does MAX158BCWI+ require an external track/hold amplifier?
No, MAX158BCWI+ does not require an external track/hold amplifier. It integrates a complete track/hold function that acquires the analog input for ~1µs before conversion begins. This internal circuitry eliminates external components, reduces PCB area, and guarantees settling performance aligned with the 2.5µs conversion time - provided source impedance remains below 100Ω as specified in the MAX158BCWI+ datasheet.
Can MAX158BCWI+ operate with a reference voltage other than the internal 2.5V?
Yes, MAX158BCWI+ supports external reference configurations. VREF+ and VREF− pins accept externally applied reference voltages spanning GND to VDD (i.e., 0V to +5V), enabling flexible full-scale adjustment. When using external references, the internal 2.5V REF OUT pin must be left unconnected or decoupled with 0.01µF to GND. Accuracy remains ±1 LSB as long as reference stability and noise meet the MAX158BCWI+ specifications.
What is the difference between Mode 0 and Mode 1 operation of MAX158BCWI+?
Mode 0 requires the microprocessor to enter a WAIT state: RD is held low until conversion completes, and data becomes valid after INT asserts. Mode 1 avoids WAIT states: RD is pulsed low to simultaneously read previous data and initiate next conversion, requiring ≥2.5µs between RD pulses. Both modes use identical CS/RD timing but differ in firmware handling - Mode 0 simplifies timing-critical code; Mode 1 improves throughput in non-WAIT-capable controllers.
Is MAX158BCWI+ pin-compatible with MAX154 series ADCs?
No, MAX158BCWI+ is not pin-compatible with MAX154 series devices. While both share functional similarities, MAX158BCWI+ uses a 28-pin SSOP package with dedicated A2, AIN5–AIN8, and rearranged DBx/CS/RD placements, whereas MAX154 variants use 24-pin packages (DIP/SO/SSOP) and only four analog inputs. Direct replacement would require PCB layout revision and firmware address decoding updates for the additional channels.
MAX158BCWI+ 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX158BCWI+ FAQ
1.How can I place an order for MAX158BCWI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX158BCWI+ 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 MAX158BCWI+ reliable?
The price and inventory of MAX158BCWI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX158BCWI+ is usually 5 days.
3.What payment methods are accepted for MAX158BCWI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX158BCWI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX158BCWI+?
MAX158BCWI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX158BCWI+ 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 MAX158BCWI+?
For technical support, including MAX158BCWI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX158BCWI+ requirements.
6.How does Aetrix verify that MAX158BCWI+ is sourced from the original manufacturer or authorized distributors?
All MAX158BCWI+ 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 MAX158BCWI+ meets industry standards.
7.What is the process for return or replacement of MAX158BCWI+?
All MAX158BCWI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX158BCWI+, 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 MAX158BCWI+ part is unused and in its original packaging.
Return procedure for MAX158BCWI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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