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Analog Devices Inc./Maxim Integrated MAX158BEPI
- Part No.:
- MAX158BEPI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
MAX158BEPI.pdf
- Description:
- HIGH-SPEED 8-BIT ADC WITH MUX
- Quantity:
- Payment:
- Shipping:
Inventory:755
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Product details
Overview
MAX158BEPI from Maxim Integrated is an 8-channel, 8-bit CMOS analog-to-digital converter with 2.5 µs conversion time per channel, internal 2.5 V reference, and built-in track/hold - enabling a complete high-speed data acquisition system on a single IC operating from a +5 V supply. It targets real-time signal digitization in telecom and servo control systems.
For engineers reviewing the MAX158BEPI datasheet, MAX158BEPI pinout, MAX158BEPI application, or MAX158BEPI equivalent, key selection considerations include its 8-channel multiplexer architecture, ±1 LSB total unadjusted error at –40°C to +85°C, open-drain RDY output for WAIT-state interfacing, and compatibility with microprocessor I/O port or memory-mapped read cycles without external logic.
Technical Context
The MAX158BEPI employs a half-flash conversion architecture with two 4-bit flash ADC sections and an internal DAC to generate residue voltage for LSB determination - achieving 8-bit resolution in 2.5 µs. It supports two digital interface modes: Mode 0 (WAIT-state compatible, INT- and RDY-driven) and Mode 1 (non-WAIT, pipelined read-conversion).
Analog input range is 0 V to +5 V referenced to VREF– (GND) and VREF+ (VDD), with input current ≤ ±3 µA and slew rate capability of 0.157 V/µs. The device integrates a 2.5 V reference output (±3 mV load regulation, 60–100 ppm/°C drift) and requires no external clock.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - delivers 256 discrete output codes for digitizing analog signals within 0 V to +5 V range. |
| Conversion Time | 2.5 µs per channel - enables up to 400 kHz aggregate sampling rate (tCRD + tp = 2.5 µs), supporting 50 kHz/channel on 8-channel operation. |
| Total Unadjusted Error | ±1 LSB - includes offset, full-scale, and linearity errors; specified over –40°C to +85°C operating range for MAX158BEPI. |
| Reference Output | 2.50 V ±3 mV - stable on-chip voltage source eliminates need for external reference; supports 10 mA max load. |
| Supply Voltage | +5 V ±5% - single-supply operation simplifies power design; IDD = 15 mA typical at TA = +25°C. |
| Analog Input Channels | 8-channel multiplexer - selectable via A2/A1/A0 address inputs; AIN1–AIN8 accept 0 V to +5 V signals with 45 pF input capacitance. |
| Digital Interface | CS and RD control only - latched address + conversion start on falling edge; outputs DB0–DB7 are three-state, TTL-compatible. |
Pinout & Package
MAX158BEPI is housed in a 28-pin plastic DIP package (0.600" wide), compliant with JEDEC MS-001. Pin layout supports direct integration into legacy through-hole PCB designs with standard 0.1" spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 (AIN1–AIN8) | Analog input channels | Eight single-ended inputs accepting 0 V to +5 V; internally multiplexed to ADC core based on A2/A1/A0 state. |
| 9, 10, 11, 12, 13, 14, 15, 16 (DB0–DB7) | Three-state digital output bus | Parallel 8-bit data output (LSB to MSB); high-impedance when CS or RD is high - directly connects to 8-bit microprocessor data bus. |
| 17 (RDY) | Open-drain ready indicator | Goes low on CS fall and returns to high-impedance at conversion end - used as microprocessor WAIT input without pull-up if unused. |
| 18 (INT) | Interrupt output | Active-low pulse signaling conversion completion; resets on rising edge of CS or RD - enables interrupt-driven data capture. |
| 19 (CS) | Chip-select input | Active-low enable; must be low to activate address latch, conversion, and output drivers - supports multi-device bus sharing. |
| 20 (RD) | Read control input | Falling edge initiates conversion in Mode 0; in Mode 1, it simultaneously reads prior result and starts new conversion. |
| 21, 22, 23 (A0, A1, A2) | Multiplexer address inputs | Select one of eight analog channels (AIN1–AIN8); decoded internally - no external decoding logic required. |
| 24 (VREF–) | Reference lower span | Zero-code reference point; tied to GND in standard configuration - sets 0 V input = 0x00 output code. |
| 25 (VREF+) | Reference upper span | Full-scale reference point; connected to VDD (+5 V) - sets +5 V input = 0xFF output code. |
| 26 (REF OUT) | 2.5 V reference output | Stable buffered 2.5 V source for external circuitry or precision scaling - load-regulated to ±6 mV at 10 mA. |
| 27 (GND) | Analog/digital ground | Common return for analog inputs, reference, and digital I/O - requires star grounding for optimal noise performance. |
| 28 (VDD) | Power supply | +5 V ±5% supply input; bypassed with 47 µF electrolytic + 0.1 µF ceramic capacitors - critical for conversion stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates external sample-and-hold circuitry - reduces board area, component count, and timing skew in high-speed acquisition paths. |
| On-chip 2.5 V reference | Provides stable, temperature-compensated reference without external components - ensures consistent full-scale accuracy across –40°C to +85°C. |
| Memory-mapped or I/O-port interface | Appears as a memory location or peripheral port to microprocessors - removes need for glue logic or address decoders in embedded systems. |
| Two-mode digital interface | Mode 0 supports WAIT-state microprocessors; Mode 1 enables pipelined operation - maximizes throughput in both legacy and modern controller environments. |
| No external clock required | Internal timing generator synchronizes conversion and data transfer - simplifies system clock tree and avoids clock distribution jitter issues. |
Applications
| Telecommunications Signal Digitization | High-Speed Servo Control Feedback |
|---|---|
Use Scenario: Digitizing multiple voice-band or baseband analog signals (e.g., 8-channel speech analysis) in real time for DSP-based echo cancellation or compression. IC Role / Device Role / Timing Role: 8-channel simultaneous-sampling ADC providing synchronized 8-bit samples at ≥50 kHz per channel with <2.5 µs latency. Use Value: Enables compact, low-latency front-end for multi-channel telecom codecs without external multiplexing or timing control logic. | Use Scenario: Capturing position, current, and voltage feedback signals from motor phases and sensors in closed-loop industrial servo drives. IC Role / Device Role / Timing Role: High-speed analog acquisition node feeding real-time PID computation - operates with deterministic 2.5 µs conversion and INT-triggered readout. Use Value: Reduces control loop jitter and improves dynamic response by eliminating external track/hold propagation delay and reference settling uncertainty. |
| Digital Signal Processing Front-End | Audio Instrumentation Sampling |
Use Scenario: Acquiring sensor or transducer outputs (e.g., vibration, pressure, temperature) for FFT-based spectral analysis in portable test equipment. IC Role / Device Role / Timing Role: Standalone data acquisition subsystem delivering 8-bit samples with ±1 LSB accuracy and integrated 2.5 V reference for ratiometric measurement. Use Value: Lowers BOM cost and PCB footprint versus discrete ADC + reference + track/hold solutions while maintaining 10 kHz input bandwidth. | Use Scenario: Sampling audio waveforms (e.g., guitar pickups, microphone preamp outputs) in entry-level digital audio analyzers or educational lab gear. IC Role / Device Role / Timing Role: 8-bit ADC with 0–5 V input range and 157 mV/µs slew rate handling up to 10 kHz sine inputs without external buffering. Use Value: Supports alias-free sampling of audio fundamentals using simple RC anti-alias filtering - avoids need for precision op-amps or active filters. |
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 |
|---|---|---|---|
| MAX158ACPI | Same 28-pin DIP package and pinout; 0°C to +70°C temp range; ±1/2 LSB error vs. BEPI's ±1 LSB. | Suitable for commercial-temperature industrial controllers where tighter accuracy is prioritized over extended thermal range. | Select MAX158ACPI when ambient operating temperature stays within 0°C–70°C and sub-LSB linearity is required. |
| ADS7822U | 8-bit, 200 kSPS SAR ADC in SO-8; no internal reference or track/hold; requires external 2.5 V ref and driver. | Better suited for low-power, space-constrained designs where 200 kSPS suffices and system already provides reference and signal conditioning. | Choose ADS7822U for battery-powered or ultra-compact applications trading speed and integration for size and power savings. |
Compared with MAX158ACPI, the MAX158BEPI trades ±0.5 LSB accuracy for guaranteed operation from –40°C to +85°C - making it preferable in automotive or outdoor industrial environments. Against ADS7822U, MAX158BEPI delivers 2× faster conversion and full signal-chain integration but occupies more board area and consumes higher current.
Availability
MAX158BEPI is available at Aetrix Electronics and suitable for high-speed data acquisition, telecommunications infrastructure, and industrial servo control requiring stable component supply across extended temperature ranges.
Supply support for MAX158BEPI 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, communications, and computing applications - emphasizing integration, reliability, and performance under harsh conditions.
The MAX154/MAX158 product line delivers highly integrated, high-speed data acquisition solutions targeting applications needing fast, accurate digitization without external support components - especially where board space, power, or timing determinism are critical.
FAQ
What is the operating temperature range for MAX158BEPI?
The MAX158BEPI is rated for operation from –40°C to +85°C. This extended industrial temperature range makes it suitable for deployment in automotive engine compartments, outdoor telecom cabinets, and factory-floor automation equipment where ambient conditions exceed commercial-grade limits. The ±1 LSB total unadjusted error specification is guaranteed across this full range.
Does MAX158BEPI require an external clock source?
No, the MAX158BEPI does not require an external clock. Its internal timing generator fully controls the half-flash conversion sequence, track/hold sampling, and digital interface handshaking. This eliminates clock routing complexity, jitter sensitivity, and external oscillator BOM cost - simplifying system-level timing design for microprocessor-based data loggers and control units.
How is the analog input range configured on MAX158BEPI?
The MAX158BEPI analog input range is set by the voltages applied to VREF– and VREF+. In the standard configuration, VREF– is connected to GND and VREF+ to VDD (+5 V), yielding a 0 V to +5 V input range. The device supports alternative configurations - such as bipolar input scaling - by driving VREF– above GND or using external references, as detailed in the datasheet's Analog Considerations section.
Can MAX158BEPI interface directly with an 8-bit microprocessor data bus?
Yes, the MAX158BEPI interfaces directly with an 8-bit microprocessor data bus via its three-state DB0–DB7 outputs. When CS and RD are asserted low, the conversion result appears on these lines in TTL-compatible logic levels. No level-shifting, bus transceivers, or address decoding logic is needed - the device behaves as a memory-mapped peripheral or I/O port depending on system bus configuration.
What is the purpose of the RDY pin on MAX158BEPI?
The RDY pin on MAX158BEPI is an open-drain ready signal used to synchronize microprocessor WAIT-state operation. It goes low when CS falls and transitions to high-impedance at conversion completion - allowing the processor to pause execution until valid data is available on DB0–DB7. An external pull-up resistor is required only if the host system uses RDY for WAIT assertion; otherwise, it may be omitted.
MAX158BEPI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Bulk
- 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:
- External, Internal
- Voltage - Supply, Analog:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 4.75V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX158BEPI FAQ
1.How can I place an order for MAX158BEPI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX158BEPI 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 MAX158BEPI reliable?
The price and inventory of MAX158BEPI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX158BEPI is usually 5 days.
3.What payment methods are accepted for MAX158BEPI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX158BEPI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX158BEPI?
MAX158BEPI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX158BEPI 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 MAX158BEPI?
For technical support, including MAX158BEPI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX158BEPI requirements.
6.How does Aetrix verify that MAX158BEPI is sourced from the original manufacturer or authorized distributors?
All MAX158BEPI 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 MAX158BEPI meets industry standards.
7.What is the process for return or replacement of MAX158BEPI?
All MAX158BEPI units undergo pre-shipment inspection (PSI). If there is an issue with MAX158BEPI, 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 MAX158BEPI part is unused and in its original packaging.
Return procedure for MAX158BEPI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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