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Analog Devices Inc./Maxim Integrated MAX158BCPI+
- Part No.:
- MAX158BCPI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
MAX158BCPI+.pdf
- Description:
- IC ADC 8BIT FLASH 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,410
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Product details
Overview
The MAX158BCPI+ 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, ±1/2 LSB total unadjusted error, and supports microprocessor interface via CS/RD control without external logic - used in real-time speech analysis, servo control, and telecom data acquisition systems.
For engineers reviewing the MAX158BCPI+ datasheet, MAX158BCPI+ pinout, MAX158BCPI+ application, or MAX158BCPI+ equivalent, key selection considerations include its 28-pin plastic DIP package, 0°C to +70°C operating range, 0V–5V analog input range, Mode 0/Mode 1 digital interface flexibility, and built-in reference stability (±100 ppm/°C drift).
Technical Context
The MAX158BCPI+ 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 conversion sequence begins on falling edges of CS and RD, with MS bits latched after ~1µs tracking and LS bits completed within 2.5µs total.
Digital interface operates in Mode 0 (WAIT-state compatible, INT- and RDY-driven) or Mode 1 (non-WAIT, pipelined read), both requiring only CS and RD signals. The device uses a 2.5V internal reference (REF OUT) with 2.47V–2.53V output at +25°C, and accepts VREF+ = VDD and VREF− = GND for full-scale definition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - provides 256 discrete output codes for digitizing analog signals in embedded control and instrumentation. |
| Conversion Time | 2.5 µs per channel - enables up to 400 kHz aggregate sampling rate (MAX158), supporting 10 kHz sinusoidal inputs without external track/hold. |
| Total Unadjusted Error | ±1/2 LSB - ensures monotonicity and no missing codes across full temperature range (0°C to +70°C). |
| Analog Input Range | 0 V to +5 V - matches standard TTL/CMOS logic levels and simplifies signal conditioning when driven by op-amps referenced to ground. |
| Reference Output | 2.50 V ±30 mV (2.47–2.53 V) - stable internal voltage source eliminates need for external precision reference in cost-sensitive designs. |
| Supply Voltage | +5 V ±5% - operates from single rail, reducing power supply complexity versus dual-supply ADCs. |
| Input Capacitance | 45 pF - defines required source impedance ≤100 Ω to ensure <1 µs settling before conversion latch. |
Pinout & Package
MAX158BCPI+ is housed in a 28-pin plastic DIP package (0.600" wide), compliant with JEDEC MS-001. Pin functions are validated per Maxim's official pin description table and functional diagrams (Rev 3, 12/96).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | AIN1–AIN8 | Analog input channels - multiplexed 8-channel front-end accepting 0V–5V signals; AIN1–AIN4 active on pins 1–4, AIN5–AIN8 on pins 27–28 and 25–26. |
| 9, 10, 11 | DB0–DB2 | Three-state data outputs (LSB) - directly connectable to 8-bit microprocessor data bus; high-impedance when CS high. |
| 12, 13, 14, 15 | DB3–DB6 | Three-state data outputs - provide bits 3–6 of 8-bit parallel output; VOL ≤ 0.4 V, VOH ≥ 2.4 V under load. |
| 16, 17 | DB7, INT | MSB output and interrupt flag - INT goes low upon conversion completion; DB7 is MSB of latched result. |
| 18, 19 | RDY, CS | Ready status and chip-select - RDY is open-drain, requires external pull-up; CS must be low to enable conversion and data access. |
| 20, 21, 22 | RD, A0, A1 | Read strobe and channel address - RD initiates conversion in Mode 0 or reads prior result in Mode 1; A0/A1 select one of four channel pairs. |
| 23, 24, 25 | A2, VREF+, VREF− | Channel address bit 2 and reference terminals - A2 enables full 8-channel selection; VREF+ = VDD, VREF− = GND sets 0V–5V full-scale range. |
| 26, 27, 28 | VDD, REF OUT, GND | Power, reference output, and ground - REF OUT supplies 2.5 V ±30 mV; bypass with 0.01 µF ceramic capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates external sample-and-hold circuitry, reducing board space and component count in compact data acquisition modules. |
| On-chip 2.5V reference | Provides stable, factory-trimmed reference (2.47–2.53 V) with ±100 ppm/°C drift - avoids calibration overhead in industrial sensor interfaces. |
| Single +5V supply | Removes need for ±12V or separate analog/digital rails, simplifying power design for embedded controllers and telecom line cards. |
| No external clock required | Internal timing control enables operation with only CS and RD signals - ideal for legacy 8080/Z80-based systems lacking dedicated clock resources. |
| Mode 0 and Mode 1 interface | Supports both WAIT-state microprocessors (Mode 0) and non-WAIT architectures (Mode 1), increasing compatibility across legacy and modern controller platforms. |
Applications
| Speech Analysis System | High-Speed Servo Control |
|---|---|
Use Scenario: Real-time spectral analysis of multi-channel audio inputs using bandpass-filtered speech signals. IC Role / Device Role / Timing Role: 8-channel ADC digitizing filtered analog voice bands at >100 kHz aggregate rate; synchronized via RD/CS strobes. Use Value: Enables simultaneous capture of 8 speech channels with 2.5 µs per conversion - meeting real-time latency requirements in voice-over-IP gateways. |
Use Scenario: Closed-loop position feedback in industrial motor drives requiring rapid response to mechanical load changes. IC Role / Device Role / Timing Role: ADC sampling encoder or resolver analog outputs to compute error correction vectors every 2.5 µs. Use Value: 400 kHz effective sampling supports >50 kHz control loop bandwidth, improving dynamic accuracy and disturbance rejection. |
| Telecom Line Monitoring | Digital Signal Processing Front-End |
Use Scenario: Analog line voltage/current monitoring across multiple PSTN subscriber lines in central office equipment. IC Role / Device Role / Timing Role: Multiplexed 8-channel acquisition of line status signals (e.g., ring detect, off-hook, DC loop current) with shared reference. Use Value: Single MAX158BCPI+ replaces eight discrete 1-channel ADCs, cutting BOM cost and PCB area while maintaining ±1/2 LSB accuracy over 0°C–70°C. |
Use Scenario: Digitizing sensor outputs (temperature, pressure, vibration) feeding fixed-point DSP algorithms in edge analytics nodes. IC Role / Device Role / Timing Role: High-fidelity 8-bit data source feeding FIR filters or FFT engines; internal reference ensures consistent scaling across channels. Use Value: Built-in 2.5V reference and 45 pF input capacitance allow direct connection to low-impedance op-amp buffers - eliminating external reference ICs and trimming components. |
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 0°C to +70°C range, but ±1/2 LSB error grade (vs. ±1 LSB for MAX158BCPI+); tighter accuracy spec. | Preferred where monotonicity and guaranteed no-missing-codes behavior are critical (e.g., precision calibration equipment). | Select MAX158ACPI+ if system-level accuracy validation requires worst-case ±1/2 LSB performance across full temperature range. |
| ADS7822U | 8-bit, 200 kSPS SAR ADC in SO-8 package; serial SPI interface vs. parallel CS/RD; no internal reference - requires external 2.5V source. | Better suited for space-constrained, low-pin-count designs where serial interface and lower power (3.5 mW) outweigh parallel bus speed needs. | Choose ADS7822U when board area is limited and microcontroller has SPI peripheral - but expect added reference and level-shifting components. |
Compared with MAX158ACPI+, the MAX158BCPI+ trades ±1/2 LSB accuracy for lower cost and broader availability in volume production; compared with ADS7822U, it offers faster parallel throughput and integrated reference at the expense of package size and interface flexibility.
Availability
MAX158BCPI+ 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-lifecycle programs.
Supply support for MAX158BCPI+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX158BCPI+ belongs to Maxim's legacy high-speed data acquisition product line, designed specifically for cost-sensitive, medium-resolution applications needing integrated reference, track/hold, and microprocessor-compatible parallel interface - targeting telecom infrastructure and embedded control.
FAQ
What is the operating temperature range for the MAX158BCPI+?
The MAX158BCPI+ is rated for 0°C to +70°C ambient operation, as confirmed by Maxim's Ordering Information table (Rev 3, 12/96). This commercial-grade range aligns with its plastic DIP packaging and is validated across all electrical specifications including ±1/2 LSB total unadjusted error and 2.5 µs conversion time.
Does the MAX158BCPI+ require an external clock signal?
No, the MAX158BCPI+ does not require an external clock. Its conversion timing is fully self-contained and triggered by CS and RD control signals, as stated in the Features section and verified in the Digital Interface description. Internal timing circuitry manages the 2.5 µs conversion cycle without external clock dependency.
Can the MAX158BCPI+ operate with a 3.3V microprocessor data bus?
The MAX158BCPI+ outputs are three-state CMOS with VOH ≥ 2.4 V and VOL ≤ 0.4 V under specified loads, making them compatible with 3.3V logic thresholds. However, its VDD must remain at +5V ±5%, so level translation or bus isolation is required if the microprocessor lacks 5V-tolerant inputs.
What is the function of the REF OUT pin on the MAX158BCPI+?
The REF OUT pin on the MAX158BCPI+ provides a buffered 2.5V reference output (2.47–2.53 V at +25°C) derived from the internal bandgap circuit. It serves as a stable voltage source for external circuitry such as sensor excitation or comparator thresholds, and must be bypassed with a 0.01 µF ceramic capacitor to GND per the Analog Considerations section.
How many analog input channels does the MAX158BCPI+ support?
The MAX158BCPI+ supports eight analog input channels (AIN1 through AIN8), as explicitly defined in the General Description, Pin Configurations diagram, and Pin Descriptions table. Channel selection is controlled via address inputs A0, A1, and A2, enabling full 8-channel multiplexing in hardware.
MAX158BCPI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX158BCPI+ FAQ
1.How can I place an order for MAX158BCPI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX158BCPI+ 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 MAX158BCPI+ reliable?
The price and inventory of MAX158BCPI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX158BCPI+ is usually 5 days.
3.What payment methods are accepted for MAX158BCPI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX158BCPI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX158BCPI+?
MAX158BCPI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX158BCPI+ 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 MAX158BCPI+?
For technical support, including MAX158BCPI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX158BCPI+ requirements.
6.How does Aetrix verify that MAX158BCPI+ is sourced from the original manufacturer or authorized distributors?
All MAX158BCPI+ 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 MAX158BCPI+ meets industry standards.
7.What is the process for return or replacement of MAX158BCPI+?
All MAX158BCPI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX158BCPI+, 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 MAX158BCPI+ part is unused and in its original packaging.
Return procedure for MAX158BCPI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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