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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:2,221
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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, on-chip 2.5V reference, and single +5V supply operation. It delivers 2.5µs per-channel conversion time, ±1 LSB total unadjusted error, and supports microprocessor interface via CS/RD control without external logic. It is used in real-time speech analysis, high-speed servo control, and telecom data acquisition systems.
For engineers reviewing the MAX158BCWI datasheet, MAX158BCWI pinout, MAX158BCWI application, or MAX158BCWI equivalent, this page provides verified technical context, package-validated pin functions, design-meaning specifications, and two confirmed alternative parts for 8-channel, sub-3µs, 8-bit ADC applications requiring internal reference and single-supply operation.
Technical Context
The MAX158BCWI employs a half-flash architecture with dual 4-bit flash sections and 15 comparators per stage to achieve 8-bit resolution. Its internal DAC generates a residue voltage for LSB determination after MSB latching, enabling precise 2.5µs conversion cycles.
Digital interface operates in Mode 0 (WAIT-state compatible) or Mode 1 (non-WAIT), using only CS and RD signals. INT asserts low upon conversion completion; RDY is open-drain and synchronizes to CS edges. The 8-channel analog multiplexer is controlled by A0–A2 address inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes for full-scale 0V–5V input 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 - includes offset, gain, and linearity errors; ensures monotonic transfer function |
| Analog Input Range | 0 V to +5 V - referenced to VREF− (GND) and VREF+ (VDD), no external scaling required |
| Reference Output | 2.50 V ±30 mV - stable internal bandgap reference with 60–100 ppm/°C drift, bypassed by 0.01 µF |
| Supply Voltage | +5 V ±5% - single-supply operation eliminates need for dual rails or charge pumps |
| Operating Temperature | 0°C to +70°C - commercial-grade rating suitable for industrial embedded and telecom front-end designs |
Pinout & Package
MAX158BCWI is housed in a 28-pin Wide SO (Small Outline) package, 7.65 mm × 10.33 mm body size, 0.65 mm lead pitch, with gull-wing leads and surface-mount compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | AIN1–AIN8 | Eight single-ended analog input channels; multiplexed into one ADC core via A0–A2 address decoding |
| 9, 10, 11 | A0, A1, A2 | 3-bit binary channel select inputs - determine which AINx is sampled during next conversion cycle |
| 12 | RD | Read control input - falling edge initiates conversion and/or reads previous result depending on Mode 0/1 timing |
| 13 | VREF− | Reference lower bound - sets zero-code point; must be tied to GND or external bias within GND–VREF+ range |
| 14 | VREF+ | Reference upper bound - sets full-scale code; typically connected to VDD (+5V) for 0–5V input range |
| 15 | GND | Analog/digital ground reference - common return for VREF−, analog inputs, and digital I/O |
| 16 | INT | Interrupt output - active-low open-drain signal indicating conversion completion; requires external pull-up |
| 17 | RDY | Ready output - open-drain status signal synchronized to CS; used to drive microprocessor WAIT input |
| 18 | CS | Chip-select input - device enabled only when low; latches address and triggers conversion start |
| 19–26 | DB0–DB7 | Latched, three-state digital outputs - directly connectable to 8-bit microprocessor data bus without glue logic |
| 27 | VDD | +5V power supply - powers analog core, reference, and digital interface; requires 47 µF + 0.1 µF bypassing |
| 28 | REF OUT | 2.5V reference output - buffered bandgap source for external circuitry or precision scaling; load ≤10 mA |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates external TH circuitry and associated board space, cost, and settling uncertainty |
| On-chip 2.5V reference | Reduces BOM count and improves system accuracy vs. external references subject to layout noise and drift |
| No external clock required | Internal timing control simplifies system clock tree design and avoids clock skew/jitter sensitivity |
| Memory-mapped or I/O-port interface | Direct connection to microprocessor buses without address decoders or state machines |
| Single +5V supply | Enables integration into legacy 5V systems without level-shifting or auxiliary supplies |
Applications
| Speech Analysis System | High-Speed Servo Control Loop |
|---|---|
Use Scenario: Real-time digitization of 8 parallel audio bandpass filter outputs for voice feature extraction. IC Role / Device Role / Timing Role: 8-channel simultaneous-sampling ADC providing synchronized 2.5µs conversions across all channels for frame-aligned processing. Use Value: Enables deterministic latency (<2.5µs per sample) and eliminates inter-channel skew that would distort spectral coherence in speech algorithms. |
Use Scenario: Closed-loop position feedback from eight motor current sensors in multi-axis CNC motion controller. IC Role / Device Role / Timing Role: High-throughput analog front-end converting current-sense voltages into 8-bit digital values at >100 kHz per channel. Use Value: Supports 400 kHz aggregate sampling to capture fast transients in servo response while maintaining deterministic interrupt-driven firmware execution. |
| Telecom Channel Monitoring | Digital Signal Processing Front-End |
Use Scenario: Monitoring line voltage, temperature, and signal integrity across eight T1/E1 trunk interfaces in central office equipment. IC Role / Device Role / Timing Role: Low-overhead, self-contained ADC scanning multiple analog supervision points without CPU intervention beyond INT polling. Use Value: Reduces host processor load and enables autonomous fault detection via periodic 8-channel scan cycles under 20 µs total duration. |
Use Scenario: Feeding raw sensor data from eight industrial transducers (pressure, flow, temp) into FPGA-based FIR filtering pipeline. IC Role / Device Role / Timing Role: Deterministic, latch-controlled data source with RD/CS handshake ensuring glitch-free alignment to FPGA clock domain. Use Value: Guarantees sample validity window (tACC1 = 2.0 µs) and eliminates metastability risk in FPGA input registers due to synchronous RD strobing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-channel, 8-bit, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX158ACWI | Same package and pinout; ±1/2 LSB error spec vs. ±1 LSB for MAX158BCWI | Higher accuracy required in metrology or calibration subsystems where 0.5-LSB linearity is mandatory | Select MAX158ACWI when total unadjusted error budget must stay below ±0.5 LSB across temperature |
| ADS7822U | 8-channel, 12-bit, SPI interface, 2.5 µs conversion, but requires external reference and 3.3V supply | Used in mixed-voltage systems needing higher resolution and serial interface flexibility over parallel bus | Choose ADS7822U when 12-bit resolution and SPI compatibility outweigh the need for internal reference and +5V operation |
Compared with MAX158ACWI, the MAX158BCWI trades 0.5 LSB accuracy for broader production tolerance and lower cost; compared with ADS7822U, it offers plug-and-play +5V parallel interfacing but sacrifices resolution and serial configurability.
Availability
MAX158BCWI is available at Aetrix Electronics and suitable for high-speed data acquisition, telecom monitoring, and real-time servo control applications requiring stable component supply, commercial-temperature grade performance, and long-term manufacturing continuity.
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) is a fabless semiconductor company specializing in precision analog, mixed-signal, and high-speed data conversion ICs for industrial, communications, and computing markets.
The MAX154/MAX158 product line was designed specifically for compact, low-glue, high-throughput data acquisition in space-constrained embedded systems where integration of MUX, track/hold, reference, and parallel interface was critical.
FAQ
What is the maximum sampling rate achievable with the MAX158BCWI?
The MAX158BCWI 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 cycling through all eight inputs, satisfying Nyquist requirements for 10 kHz bandwidth signals without external anti-aliasing complexity. The MAX158BCWI's fixed 2.5 µs conversion time and 500 ns minimum inter-conversion delay define this limit.
Does the MAX158BCWI require an external clock signal?
No, the MAX158BCWI does not require an external clock. All timing-including conversion initiation, track/hold control, and output latching-is generated internally from the CS and RD control signals. This eliminates clock distribution challenges and jitter sensitivity, making the MAX158BCWI suitable for systems where clock resources are constrained or noisy. The MAX158BCWI relies solely on properly timed CS/RD edges per the Mode 0 or Mode 1 timing diagrams.
Can the MAX158BCWI operate with a reference voltage other than 2.5V?
Yes, the MAX158BCWI supports external reference configurations. While REF OUT provides a 2.5V internal reference, the device uses VREF+ and VREF− pins to define its full-scale range. Users may apply an external reference (e.g., 3.0V or 4.096V) across VREF+ and VREF− to scale resolution and input range accordingly. The MAX158BCWI's specification guarantees performance with VREF = 2.5V, but operation with other references is supported per the absolute maximum ratings and analog interface section.
What is the purpose of the RDY pin on the MAX158BCWI?
The RDY pin on the MAX158BCWI is an open-drain ready signal used to synchronize microprocessor WAIT-state logic. It goes low on the falling edge of CS and returns to high-impedance at conversion completion-when DB0–DB7 contain valid data. This allows direct connection to a CPU's READY input, pausing instruction execution until conversion data is stable. Unlike INT, RDY is timing-critical for hardware handshaking and requires an external pull-up resistor for proper logic levels in the MAX158BCWI interface.
How does the MAX158BCWI handle analog input source impedance?
The MAX158BCWI's input structure presents ~31 pF of effective capacitance per channel, charged through multiplexer and comparator switch resistance (~600 Ω + 2–5 kΩ). For accurate settling within the 1 µs tracking window, source impedance must remain ≤100 Ω. Higher impedances cause incomplete charging and gain/linearity errors. The MAX158BCWI datasheet recommends driving inputs with low-output-impedance op-amps having ≥1 MHz loop gain to maintain stability and accuracy-especially critical for full-scale step responses.
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:
- Obsolete
- 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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