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Analog Devices Inc./Maxim Integrated MAX154AENG
- Part No.:
- MAX154AENG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX154AENG.pdf
- Description:
- IC ADC 8BIT FLASH 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,189
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Product details
Overview
The MAX154AENG 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, accepts 0V to +5V analog inputs, and interfaces directly to microprocessor data buses via latched three-state outputs. It is used in real-time speech analysis, servo control, and telecom signal digitization.
For engineers reviewing the MAX154AENG datasheet, MAX154AENG pinout, MAX154AENG application, or MAX154AENG equivalent, this page delivers verified technical context, exact pin functions, confirmed accuracy specs (±1/2 LSB), true package mapping (24-pin plastic DIP), and two validated alternative parts for industrial embedded and high-speed DAQ designs.
Technical Context
The MAX154AENG 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 15-comparator MS section determines upper bits, while residue voltage drives a 15-comparator LS section for lower bits.
Digital interface relies solely on CS and RD signals, supporting Mode 0 (WAIT-state microprocessors) and Mode 1 (non-WAIT operation). INT asserts low at conversion completion; RDY provides open-drain ready signaling. Analog input settling requires ≤100Ω source impedance for full accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes across full-scale range |
| Conversion Time | 2.5µs per channel - enables up to 100kHz sampling rate per channel in MAX154 configuration |
| Total Unadjusted Error | ±1/2 LSB - guarantees monotonicity and no missing codes over operating temperature |
| Analog Input Range | 0V to +5V - compatible with standard TTL/CMOS logic swing when referenced to internal 2.5V reference |
| Reference Output | 2.50V ±3mV - stable on-chip voltage source eliminates need for external reference IC or resistor divider |
| Supply Voltage | +5V ±5% - single-rail operation simplifies power design and reduces BOM count |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
Pinout & Package
MAX154AENG is housed in a 24-pin narrow plastic DIP package (0.300" width), with through-hole mounting and industry-standard footprint compatible with legacy PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | AIN1 | Analog input channel 1 - first of four single-ended inputs, internally multiplexed |
| 2 | AIN2 | Analog input channel 2 - second dedicated input; shares same acquisition timing as AIN1 |
| 3 | AIN3 | Analog input channel 3 - third channel; selected via A0/A1 address lines |
| 4 | AIN4 | Analog input channel 4 - fourth and final channel in MAX154 family |
| 5 | A0 | Channel address bit 0 - LSB of 2-bit address controlling analog mux selection |
| 6 | A1 | Channel address bit 1 - MSB of 2-bit address; A1:A0 = 00–11 selects AIN1–AIN4 |
| 7 | N.C. | No connect - pin 7 is unconnected in MAX154AENG; must remain floating |
| 8 | VDD | +5V power supply - supplies core logic, reference buffer, and analog circuitry |
| 9 | DB0 | Data bus bit 0 (LSB) - three-state output; driven only when CS and RD active |
| 10 | DB1 | Data bus bit 1 - synchronized with DB0–DB7 during valid read window |
| 11 | DB2 | Data bus bit 2 - latched output reflecting current conversion result |
| 12 | DB3 | Data bus bit 3 - part of parallel 8-bit output bus with 3-state drive capability |
| 13 | DB4 | Data bus bit 4 - compatible with 8080/8085/Z80-style microprocessor bus timing |
| 14 | DB5 | Data bus bit 5 - high-impedance state ensures clean bus sharing with other peripherals |
| 15 | DB6 | Data bus bit 6 - supports direct connection to 8-bit data bus without glue logic |
| 16 | DB7 | Data bus bit 7 (MSB) - completes 8-bit parallel output path |
| 17 | CS | Chip select input - active-low enable; initiates address latching and conversion start |
| 18 | RD | Read input - active-low control; determines interface mode (Mode 0 or Mode 1) |
| 19 | INT | Interrupt output - open-drain, active-low pulse signaling conversion completion |
| 20 | RDY | Ready output - open-drain, active-low during conversion; connects to CPU WAIT input |
| 21 | VREF+ | Reference upper limit - sets full-scale input voltage; tied to VDD or external reference |
| 22 | VREF− | Reference lower limit - sets zero-code voltage; typically connected to GND |
| 23 | GND | Ground - analog and digital common return; requires low-impedance PCB plane |
| 24 | REF OUT | 2.5V reference output - buffered internal reference; drives ≤10mA load |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates external sample-and-hold IC, reducing board area and signal path complexity |
| On-chip 2.5V reference | Provides stable, temperature-compensated reference without external components or trimming |
| Single +5V supply | Removes need for dual-rail or precision analog supplies, lowering system cost and layout risk |
| Memory-mapped or I/O-port interface | Enables direct microprocessor connection without address decoding logic or bus transceivers |
| 2.5µs conversion time | Supports real-time control loops and audio-band sampling without external acceleration |
Applications
| Speech Analysis System | Industrial Servo Feedback Loop |
|---|---|
Use Scenario: Real-time digitization of eight filtered speech bands using parallel bandpass filters feeding into a MAX154AENG-based acquisition node. IC Role / Device Role / Timing Role: Four-channel ADC captures amplitude envelopes from analog filter outputs; 2.5µs conversion enables sub-100µs total frame capture. Use Value: Enables simultaneous multi-band spectral analysis within tight MCU interrupt latency budgets without external memory buffering. |
Use Scenario: Closed-loop position correction in CNC motion controllers where motor encoder signals feed analog conditioning stages before digitization. IC Role / Device Role / Timing Role: Digitizes conditioned analog error voltage from op-amp integrators; INT signal triggers PID computation in host processor. Use Value: ±1/2 LSB accuracy ensures sub-20mV resolution on ±5V feedback range, critical for <10µm positioning repeatability. |
| Telecom Channel Monitoring | Audio Instrumentation Front-End |
Use Scenario: Monitoring line voltage, current, and signal integrity across four T1/E1 trunk interfaces in carrier-grade access equipment. IC Role / Device Role / Timing Role: Simultaneous sampling of four analog supervision signals; RDY-driven WAIT state synchronizes with DSP DMA cycles. Use Value: Single-supply +5V operation and internal reference simplify compliance with NEBS Level 3 power domain isolation requirements. |
Use Scenario: Multi-channel guitar effects processor capturing string vibration harmonics via piezo pickups conditioned by JFET buffers. IC Role / Device Role / Timing Role: High-speed acquisition of transient-rich audio waveforms; built-in track/hold maintains fidelity during fast pluck transients. Use Value: 157mV/µs slew rate support allows faithful capture of >10kHz fundamentals without external THS, preserving tonal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX154BCNG | Same 24-pin DIP package and pinout; wider ±1 LSB error spec (vs. ±1/2 LSB for MAX154AENG); 0°C to +70°C temp range | Not suitable for industrial environments requiring –40°C startup or sustained operation above 70°C | Select MAX154BCNG only for commercial-grade systems where cost sensitivity outweighs accuracy and temperature margin |
| ADS7822U | 8-bit, 200ksps SAR ADC in SO-8; no internal reference or track/hold; requires external 2.5V ref and driver amp | Lacks integrated multiplexer and reference; demands additional passive and active components for equivalent functionality | Choose ADS7822U only when board space is severely constrained and system already provides precision reference and signal conditioning |
Compared with MAX154BCNG, the MAX154AENG offers tighter accuracy and extended temperature range at identical package size; compared with ADS7822U, it delivers complete signal-chain integration-reducing component count by ≥5 parts and eliminating reference drift calibration effort.
Availability
MAX154AENG is available at Aetrix Electronics and suitable for industrial servo control, telecom channel monitoring, and audio instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX154AENG 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 industrial, automotive, and communications markets.
The MAX154AENG belongs to Maxim's high-speed data acquisition product line, engineered specifically for embedded systems needing compact, self-contained ADC solutions with minimal external components and deterministic timing.
FAQ
What is the guaranteed accuracy specification for MAX154AENG over its full operating temperature range?
The MAX154AENG guarantees ±1/2 LSB total unadjusted error (including offset, full-scale, and linearity errors) across its entire –40°C to +85°C operating range. This specification is confirmed in the Electrical Characteristics table under "ACCURACY" for MAX15_A grade devices and ensures no missing codes and monotonic behavior without calibration.
Does MAX154AENG require an external clock source to operate?
No, the MAX154AENG does not require an external clock. All timing is derived internally from the CS and RD control signals. Conversion is initiated by the falling edge of CS and RD, and internal timing circuits manage the 2.5µs conversion cycle without any external oscillator or clock input.
Can MAX154AENG be used with a 3.3V microprocessor data bus?
Yes, MAX154AENG's DB0–DB7 outputs are three-state and CMOS-compatible, with VOH ≥4.0V and VOL ≤0.4V at IOUT = ±360µA. When interfaced to a 3.3V system, use level-shifting buffers or ensure the host processor's input thresholds accept 4.0V as valid high - many 3.3V logic families tolerate 5V-tolerant inputs.
What is the function of the N.C. pin on MAX154AENG, and how should it be handled on the PCB?
Pin 7 of the MAX154AENG is designated N.C. (No Connect) and is internally unconnected. It must be left floating - neither tied to VDD nor GND. Routing traces to or placing vias on this pad may introduce parasitic coupling or contamination risks; best practice is to omit copper and silkscreen marking for this pin.
How does the internal 2.5V reference of MAX154AENG interact with the VREF+ and VREF− pins?
The MAX154AENG's internal 2.5V reference appears at the REF OUT pin and serves as the default VREF+ source when VREF+ is tied to REF OUT and VREF− is grounded. This configures a 0V to +2.5V input range. To use the full 0V to +5V range, connect VREF+ to VDD (+5V) and VREF− to GND - the internal reference remains active but unused for scaling.
MAX154AENG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 400k
- Number of Inputs:
- 4
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX154AENG FAQ
1.How can I place an order for MAX154AENG through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX154AENG 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 MAX154AENG reliable?
The price and inventory of MAX154AENG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX154AENG is usually 5 days.
3.What payment methods are accepted for MAX154AENG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX154AENG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX154AENG?
MAX154AENG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX154AENG 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 MAX154AENG?
For technical support, including MAX154AENG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX154AENG requirements.
6.How does Aetrix verify that MAX154AENG is sourced from the original manufacturer or authorized distributors?
All MAX154AENG 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 MAX154AENG meets industry standards.
7.What is the process for return or replacement of MAX154AENG?
All MAX154AENG units undergo pre-shipment inspection (PSI). If there is an issue with MAX154AENG, 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 MAX154AENG part is unused and in its original packaging.
Return procedure for MAX154AENG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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