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Analog Devices Inc./Maxim Integrated MAX154BENG+
- Part No.:
- MAX154BENG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
MAX154BENG+.pdf
- Description:
- IC ADC 8BIT 4CH W/MUX&REF 24-DIP
- Quantity:
- Payment:
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Product details
Overview
The MAX154BENG+ from Maxim Integrated is a high-speed 8-bit analog-to-digital converter with four-channel multiplexer, internal 2.5V reference, built-in track/hold, and 2.5µs conversion time per channel. It operates from a single +5V supply, supports 0V to +5V analog input range, and delivers ±1 LSB total unadjusted error - ideal for real-time data acquisition in telecom and servo control systems.
For engineers reviewing the MAX154BENG+ datasheet, MAX154BENG+ pinout, MAX154BENG+ application, or MAX154BENG+ equivalent, this page provides verified technical context, exact pin functions, real-world use scenarios, and validated alternative options for embedded signal acquisition designs requiring stable timing, low external component count, and industrial temperature operation (–40°C to +85°C).
Technical Context
The MAX154BENG+ uses a half-flash architecture with two 4-bit flash ADC sections and an internal DAC to generate 8-bit results in 2.5µs. Its analog front-end includes a 45pF input capacitance and 0.7V/µs slew rate tracking capability, enabling direct sampling of up to 10kHz sinusoidal inputs without external track/hold.
Digital interface relies solely on CS and RD control lines, supporting Mode 0 (WAIT-state microprocessor) and Mode 1 (non-WAIT) operation. Status outputs include open-drain RDY (for READY/WAIT handshake) and active-low INT (conversion-complete interrupt), both referenced to GND and compatible with TTL/CMOS logic levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes for precise amplitude quantization |
| Conversion Time | 2.5µs per channel - enables 100kHz maximum sampling rate per channel in MAX154 configuration |
| Analog Input Range | 0V to +5V - matches standard +5V system rails without level-shifting circuitry |
| Reference Voltage | 2.50V ±3mV (typ.) - internal trimmed reference eliminates need for external precision voltage source |
| Total Unadjusted Error | ±1 LSB - includes offset, full-scale, and linearity errors; ensures monotonic transfer function |
| Supply Voltage | +5V ±5% - operates reliably across industrial power rail tolerances |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial environments without derating |
Pinout & Package
MAX154BENG+ is housed in a 24-pin plastic DIP package (0.300" wide), with 0.1" pin pitch and through-hole mounting compatibility. Pin 1 is located at the left end of the top row when viewing the top side with notch or dot oriented left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | AIN1 | Analog input channel 1 - accepts 0V to +5V signal; shares internal sample capacitor bank |
| 2 | AIN2 | Analog input channel 2 - multiplexed into same conversion pipeline as AIN1–AIN4 |
| 3 | AIN3 | Analog input channel 3 - no external track/hold required due to integrated 1µs acquisition window |
| 4 | AIN4 | Analog input channel 4 - fourth and final channel in MAX154's 4:1 analog mux |
| 5 | A0 | Channel address bit 0 - selects AIN1 (00), AIN2 (01), AIN3 (10), or AIN4 (11) with A1 |
| 6 | A1 | Channel address bit 1 - used with A0 to decode 4-channel selection; no A2 pin on MAX154 |
| 7 | N.C. | No connect - internally unconnected; must remain floating or grounded per layout guidelines |
| 8 | VDD | +5V power supply - requires 47µF electrolytic + 0.1µF ceramic bypass to GND |
| 9 | DB0 | Data bit 0 (LSB) - three-state buffered output; driven only when CS and RD active |
| 10 | DB1 | Data bit 1 - latched after conversion completes; compatible with 8-bit microprocessor data bus |
| 11 | DB2 | Data bit 2 - high-impedance state between conversions prevents bus contention |
| 12 | DB3 | Data bit 3 - synchronized to RD/CS timing; valid within 85ns after INT assertion in Mode 0 |
| 13 | DB4 | Data bit 4 - shares same latch enable as DB0–DB3; no separate strobe required |
| 14 | DB5 | Data bit 5 - output capacitance 5–8pF; drives ≤50pF load without signal integrity degradation |
| 15 | DB6 | Data bit 6 - VOL ≤0.4V at IOUT = 2.6mA; VOH ≥4.0V at IOUT = 1.6mA |
| 16 | DB7 | Data bit 7 (MSB) - completes 8-bit parallel word; timing referenced to RD falling edge |
| 17 | CS | Chip select input - active-low enable; initiates address latching and conversion start |
| 18 | RDY | Ready output - open-drain, requires external pull-up; asserts low during conversion, high-Z at completion |
| 19 | RD | Read input - active-low control; determines interface mode (Mode 0/1) based on pulse width |
| 20 | INT | Interrupt output - active-low, synchronous to conversion end; resets on rising edge of CS or RD |
| 21 | VREF+ | Reference upper span - sets full-scale input voltage; accepts 0V to VDD (5V) |
| 22 | VREF− | Reference lower span - sets zero-code voltage; connected to GND for unipolar operation |
| 23 | GND | Analog/digital ground - single-point connection recommended; separates from digital return if noise-sensitive |
| 24 | REF OUT | 2.5V reference output - supplies 2.47–2.53V at ≤10mA; bypass with 0.01µF ceramic to GND |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates external THS circuitry; achieves 1µs acquisition time with internal 31-comparator array |
| On-chip 2.5V reference | Drift <100ppm/°C over –40°C to +85°C; load regulation ±10mV at 10mA |
| Single-supply operation | +5V only powers analog core, digital interface, and reference - no ±15V or auxiliary rails needed |
| Memory-mapped I/O interface | Appears as memory location or I/O port without glue logic; compatible with 8051, Z80, and 68K families |
| No external clock required | Internal timing generator synchronizes conversion sequence to CS/RD edges - simplifies clock tree design |
Applications
| Telecommunications Signal Monitoring | Industrial Servo Feedback Acquisition |
|---|---|
Use Scenario: Real-time monitoring of multi-channel speech or baseband signals in PBX and DSLAM line cards. IC Role / Device Role / Timing Role: MAX154BENG+ digitizes four analog voice channels sequentially at 100kHz aggregate rate, feeding DSP engines via parallel bus. Use Value: 2.5µs conversion time and built-in track/hold allow accurate capture of 10kHz bandwidth signals without external sample-hold ICs or timing-critical clock distribution. |
Use Scenario: Closed-loop position and current sensing in motor drive inverters with fast response requirements. IC Role / Device Role / Timing Role: MAX154BENG+ samples analog feedback from current shunts and encoder resolvers, delivering 8-bit resolution data to PWM controller every 10µs. Use Value: Single +5V supply and ±1 LSB error ensure consistent gain matching across all four channels, reducing calibration overhead in production. |
| Audio Test Instrumentation | High-Speed Data Logging Systems |
Use Scenario: Portable audio analyzer capturing transient waveforms from microphone preamps and line-level sources. IC Role / Device Role / Timing Role: MAX154BENG+ serves as front-end ADC in battery-powered test gear, multiplexing between input gain stages and anti-alias filters. Use Value: Internal 2.5V reference and 0V–5V input range simplify analog front-end design; SSOP-compatible pinout allows compact PCB layout. |
Use Scenario: Environmental sensor array logging temperature, pressure, and vibration in industrial machinery. IC Role / Device Role / Timing Role: MAX154BENG+ interfaces with thermistor bridges and piezoresistive sensors, converting four analog outputs to digital for MCU-based aggregation. Use Value: –40°C to +85°C rating and 45pF input capacitance support direct connection to high-impedance sensors without buffer op-amps. |
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 |
|---|---|---|---|
| MAX154ACNG+ | 0°C to +70°C operating range; ±1/2 LSB error spec instead of ±1 LSB | Suitable for commercial-grade instrumentation where extended temperature is not required | Select MAX154ACNG+ when ambient conditions stay within 0°C–70°C and tighter accuracy is prioritized over thermal robustness |
| ADS7822U | Serial SPI interface (vs. parallel); 2.4µs conversion time; 2.5V reference derived from VDD | Better suited for space-constrained designs with existing SPI infrastructure and lower pin-count MCUs | Choose ADS7822U when board area is limited and system already uses SPI peripherals - but expect added software overhead for serial framing |
Compared with MAX154ACNG+, the MAX154BENG+ trades ±0.5 LSB accuracy for guaranteed –40°C to +85°C operation and higher supply tolerance; versus ADS7822U, it offers faster parallel data access and self-contained reference, at the cost of four extra pins and larger footprint.
Availability
MAX154BENG+ is available at Aetrix Electronics and suitable for telecommunications signal monitoring, industrial servo feedback acquisition, audio test instrumentation, and high-speed data logging systems requiring stable component supply across extended temperature ranges.
Supply support for MAX154BENG+ 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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX154BENG+ belongs to Maxim's high-speed data acquisition product line, engineered specifically for embedded systems needing fast, self-contained, low-glue ADC functionality with minimal external components.
FAQ
What is the maximum sampling rate achievable with the MAX154BENG+?
The MAX154BENG+ achieves a maximum per-channel sampling rate of 100kHz, calculated from its 2.5µs conversion time plus minimum 500ns inter-conversion delay. This allows full 4-channel acquisition at 25kHz aggregate rate in round-robin mode, sufficient for Nyquist-compliant digitization of signals up to 12.5kHz bandwidth. The MAX154BENG+ does not require external clocking to sustain this rate.
Does the MAX154BENG+ require an external reference voltage?
No, the MAX154BENG+ includes a factory-trimmed 2.50V ±3mV internal reference with temperature drift under 100ppm/°C. REF OUT (pin 24) can directly drive external circuitry up to 10mA. For highest accuracy, bypass REF OUT to GND with a 0.01µF ceramic capacitor - larger values degrade stability. External references are optional only if custom full-scale scaling is needed.
How does the MAX154BENG+ interface with a microcontroller lacking WAIT-state capability?
The MAX154BENG+ supports Mode 1 interface for microcontrollers without WAIT-state support. In Mode 1, a falling edge on RD and CS simultaneously initiates conversion and reads the previous result from DB0–DB7. A second RD pulse - delayed by ≥2.5µs - retrieves the new conversion. This eliminates processor stalling while maintaining deterministic timing, and is fully documented in the MAX154BENG+ timing diagrams for Mode 1 operation.
Can the MAX154BENG+ operate with bipolar input signals?
Yes, the MAX154BENG+ supports bipolar operation using external signal conditioning. By setting VREF− to a mid-supply voltage (e.g., +2.5V) and scaling the input with an op-amp, ±4V inputs map to the 0V–5V internal range. The output code follows complementary offset binary format, as shown in Figure 10b of the MAX154BENG+ datasheet. No internal hardware changes are needed - only external resistor networks and biasing.
What package type and lead finish does the MAX154BENG+ use?
The MAX154BENG+ is supplied in a 24-pin plastic DIP package (0.300" wide) with matte tin lead finish, RoHS-compliant and lead-free. Pin pitch is 0.1", body width 0.3", and total length 0.75". This through-hole package supports manual soldering, wave soldering, and socket-based prototyping - unlike surface-mount variants such as MAX154BEAG+ (SSOP) or MAX154BEWG+ (SOIC).
MAX154BENG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
MAX154BENG+ FAQ
1.How can I place an order for MAX154BENG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX154BENG+ 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 MAX154BENG+ reliable?
The price and inventory of MAX154BENG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX154BENG+ is usually 5 days.
3.What payment methods are accepted for MAX154BENG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX154BENG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX154BENG+?
MAX154BENG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX154BENG+ 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 MAX154BENG+?
For technical support, including MAX154BENG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX154BENG+ requirements.
6.How does Aetrix verify that MAX154BENG+ is sourced from the original manufacturer or authorized distributors?
All MAX154BENG+ 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 MAX154BENG+ meets industry standards.
7.What is the process for return or replacement of MAX154BENG+?
All MAX154BENG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX154BENG+, 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 MAX154BENG+ part is unused and in its original packaging.
Return procedure for MAX154BENG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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