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Analog Devices Inc./Maxim Integrated MAX158ACPI+
- Part No.:
- MAX158ACPI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
MAX158ACPI+.pdf
- Description:
- IC ADC 8BIT FLASH 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,562
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Product details
Overview
MAX158ACPI+ 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 achieves 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 multi-channel data acquisition systems.
For engineers reviewing the MAX158ACPI+ datasheet, MAX158ACPI+ pinout, MAX158ACPI+ application, or MAX158ACPI+ equivalent, key selection considerations include its 8-channel multiplexer architecture, ±1/2 LSB total unadjusted error, Mode 0/Mode 1 digital interface flexibility, and compatibility with standard 28-pin plastic DIP layouts for legacy industrial control designs.
Technical Context
The MAX158ACPI+ employs a half-flash conversion architecture using two 4-bit flash ADC sections - one for MSBs and one for LSBs - with 15 comparators per stage and internal DAC residue generation. Its timing is controlled by CS and RD inputs, supporting both WAIT-state (Mode 0) and non-WAIT (Mode 1) microprocessor interfacing.
It features a built-in track/hold function eliminating external components, operates with no external clock required, and uses VREF+ and VREF− pins to define full-scale and zero-code voltage boundaries. The REF OUT pin delivers a stable 2.47–2.53V output at 25°C with ±100ppm/°C temperature drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - provides 256 discrete output codes for digitizing analog signals within 0V–5V range |
| Conversion Time | 2.5µs per channel - enables up to 100kHz effective sampling rate per channel in MAX158 configuration |
| Total Unadjusted Error | ±1/2 LSB - guarantees monotonicity and no missing codes across full operating temperature range (0°C to +70°C) |
| Analog Input Range | 0V to +5V - compatible with standard TTL/CMOS logic levels and single-supply signal conditioning stages |
| Reference Output | 2.50V ±30mV - internally generated, eliminates need for external precision reference in cost-sensitive applications |
| Supply Voltage | +5V ±5% - operates from standard logic rail without auxiliary supplies or regulators |
| Digital Interface | CS + RD only - simplifies microprocessor connection with no address decoding or control logic required |
Pinout & Package
MAX158ACPI+ is housed in a 28-pin plastic DIP package (0.600" width), pin-compatible with industry-standard through-hole mounting and socketing for prototyping and industrial control boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | AIN1–AIN8 | Analog input channels - selectable via A0/A1/A2 address lines; each accepts 0V–5V differential or single-ended signals |
| 9, 10 | A0, A1 | Multiplexer address inputs - select one of eight analog channels in conjunction with A2 (pin 23) |
| 11 | INT | Interrupt output - active-low pulse indicates conversion completion; directly connects to CPU interrupt request line |
| 12 | GND | Analog/digital ground reference - must be tied to system common ground with low-impedance path |
| 13 | VREF− | Reference lower bound - sets zero-code voltage; connected to GND for unipolar 0V–5V operation |
| 14 | VREF+ | Reference upper bound - sets full-scale voltage; typically tied to VDD (+5V) for standard operation |
| 15 | RDY | Ready output - open-drain signal synchronized to CS falling edge; drives microprocessor WAIT input |
| 16 | CS | Chip-select input - enables device and latches channel address on falling edge |
| 17, 18, 19, 20, 21, 22, 23, 24 | DB0–DB7 | Three-state data outputs - provide latched 8-bit parallel result; directly connect to 8-bit data bus without buffers |
| 25 | RD | Read input - initiates conversion and controls data access timing in Mode 0 or Mode 1 |
| 26 | VDD | Power supply - +5V ±5% supply pin; requires 47µF electrolytic + 0.1µF ceramic bypass to GND |
| 27 | REF OUT | 2.5V reference output - buffered source for external circuitry or as VREF+ alternative; load ≤10mA |
| 28 | A2 | Multiplexer address input - completes 3-bit channel selection (A2/A1/A0) for 8-channel addressing |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates external sample-and-hold IC and associated layout complexity, reducing BOM count and board area |
| On-chip 2.5V reference | Provides stable, factory-trimmed reference without external components - improves system accuracy and reduces calibration overhead |
| Single +5V supply | Removes need for dual or split supplies, enabling direct integration into +5V logic systems without level-shifting or regulation |
| No external clock required | Internal timing generator synchronizes conversion to CS/RD edges - simplifies clock tree design and avoids jitter-sensitive external oscillators |
| Microprocessor-compatible interface | Appears as memory-mapped I/O location with no glue logic - supports direct connection to Z80, 8086, and 68000 family buses |
Applications
| Speech Analysis System | High-Speed Servo Control |
|---|---|
Use Scenario: Real-time digitization of 8-band filtered audio signals from microphone array for voice recognition preprocessing. IC Role / Device Role / Timing Role: 8-channel simultaneous sampling ADC providing synchronized 8×100kHz data streams to DSP engine. Use Value: Enables deterministic latency (<2.5µs/channel) and eliminates inter-channel skew between bandpass filter outputs. | Use Scenario: Closed-loop position feedback in CNC machine tool axis controllers requiring rapid response to mechanical load changes. IC Role / Device Role / Timing Role: High-throughput analog sensor interface converting encoder/resolver analog outputs into position error signals for PID computation. Use Value: 2.5µs conversion time allows >300kHz control loop update rates, improving dynamic tracking accuracy under transient loads. |
| Telecom Channel Monitoring | Digital Signal Processing Front-End |
Use Scenario: Monitoring of 8 analog line cards in central office equipment for signal integrity, clipping, and noise floor detection. IC Role / Device Role / Timing Role: Multi-channel acquisition node feeding FPGA-based spectral analysis and alarm generation logic. Use Value: Built-in 2.5V reference ensures consistent gain calibration across all 8 channels without per-channel trimming. | Use Scenario: Digitizing outputs of anti-aliasing filters prior to FFT processing in spectrum analyzers or vibration monitoring instruments. IC Role / Device Role / Timing Role: Precision front-end ADC delivering 8-bit samples at up to 400kHz aggregate rate (50kHz per channel). Use Value: ±1/2 LSB error specification guarantees no missing codes during high-dynamic-range signal capture, preserving FFT bin integrity. |
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, 2.4µs conversion, no internal reference | Requires external reference and serial interface logic; better for higher-precision, lower-speed embedded systems | Select when resolution >8-bit and board space favors SOIC-8 over DIP-28 |
| MAX1112CPE+ | 8-bit, 8-channel, but uses serial (SPI) interface and lacks internal track/hold | Needs external track/hold and serial-to-parallel conversion; suited for low-pin-count microcontroller designs | Choose when minimizing I/O count outweighs conversion speed and analog integration benefits |
Compared with ADS7822U and MAX1112CPE+, the MAX158ACPI+ offers superior system-level integration - combining track/hold, reference, and parallel interface in a single DIP package - making it optimal for legacy industrial controllers where board real estate and design cycle time are constrained.
Availability
MAX158ACPI+ is available at Aetrix Electronics and suitable for high-speed data acquisition, telecom channel monitoring, and real-time servo control applications requiring stable component supply across extended product lifecycles.
Supply support for MAX158ACPI+ 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 U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs for industrial, communications, and computing markets.
The MAX154/MAX158 product line was designed specifically for cost-sensitive, high-throughput data acquisition systems requiring minimal external components - targeting instrumentation, test equipment, and automated control applications.
FAQ
What is the operating temperature range for MAX158ACPI+?
The MAX158ACPI+ is rated for operation from 0°C to +70°C, as indicated by the 'C' suffix in its ordering code. This commercial-grade temperature range makes it suitable for indoor industrial control panels, laboratory instruments, and telecom infrastructure equipment with controlled thermal environments. The device maintains ±1/2 LSB total unadjusted error across this full range.
Does MAX158ACPI+ require an external clock source?
No, the MAX158ACPI+ does not require an external clock. Its internal timing generator is fully synchronized to the CS and RD control signals, enabling autonomous conversion initiation and data latching. This eliminates clock distribution complexity and jitter sensitivity, allowing direct integration into microprocessor systems without additional timing components.
Can MAX158ACPI+ operate with a 0V to 2.5V analog input range?
Yes, the MAX158ACPI+ supports a 0V to 2.5V input range by connecting VREF+ to 2.5V (e.g., from REF OUT) and VREF− to GND. In this configuration, the full-scale code (11111111) corresponds to 2.5V, and resolution remains 8-bit with 9.77mV/LSB step size. The internal 2.5V reference ensures accuracy without external trimming.
How is channel selection implemented on MAX158ACPI+?
Channel selection on MAX158ACPI+ is performed using the 3-bit address bus formed by pins A0 (pin 9), A1 (pin 10), and A2 (pin 23). These inputs are latched on the falling edge of CS, selecting one of eight analog inputs (AIN1–AIN8) for conversion. Address setup and hold times are specified at 30ns and 30ns respectively, compatible with standard 5V logic families.
What is the purpose of the RDY pin on MAX158ACPI+?
The RDY pin on MAX158ACPI+ is an open-drain ready signal used to drive a microprocessor's WAIT or READY input. It goes low on the falling edge of CS and returns to high-impedance at conversion completion, enabling automatic WAIT-state extension without software polling. An external pull-up resistor (typically 4.7kΩ to +5V) is required for proper logic-level translation.
MAX158ACPI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX158ACPI+ FAQ
1.How can I place an order for MAX158ACPI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX158ACPI+ 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 MAX158ACPI+ reliable?
The price and inventory of MAX158ACPI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX158ACPI+ is usually 5 days.
3.What payment methods are accepted for MAX158ACPI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX158ACPI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX158ACPI+?
MAX158ACPI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX158ACPI+ 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 MAX158ACPI+?
For technical support, including MAX158ACPI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX158ACPI+ requirements.
6.How does Aetrix verify that MAX158ACPI+ is sourced from the original manufacturer or authorized distributors?
All MAX158ACPI+ 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 MAX158ACPI+ meets industry standards.
7.What is the process for return or replacement of MAX158ACPI+?
All MAX158ACPI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX158ACPI+, 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 MAX158ACPI+ part is unused and in its original packaging.
Return procedure for MAX158ACPI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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