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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 4CH W/MUX&REF 24-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,404
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Product details
Overview
MAX154AENG+ from Maxim Integrated is a high-speed 8-bit analog-to-digital converter (ADC) with four-channel analog multiplexer, on-chip 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.
For engineers reviewing the MAX154AENG+ datasheet, MAX154AENG+ pinout, MAX154AENG+ application, or MAX154AENG+ equivalent, this page delivers verified technical context, exact pin functions for the 24-pin plastic DIP package, real-world timing and accuracy specs, and validated alternative options for high-speed data acquisition systems.
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 analog input stage includes 31 comparators and 45pF input capacitance, requiring ≤100Ω source impedance for full-spec settling within the 1µs tracking window.
Digital interface supports two modes: Mode 0 (WAIT-state compatible, RD held low until conversion completes) and Mode 1 (non-WAIT, RD pulse initiates new conversion while reading prior result). Status is signaled via open-drain RDY (for READY/WAIT input) and active-low INT (interrupt output).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete digital codes over 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 across temperature |
| Analog Input Range | 0V to +5V - compatible with standard +5V system rails without level-shifting |
| Reference Output | 2.50V ±3mV at +25°C - stable internal reference eliminates external voltage reference component |
| Supply Voltage | +5V ±5% - operates within standard TTL/CMOS logic supply tolerance |
| Input Capacitance | 45pF - defines required driver bandwidth and source impedance limits for accurate sampling |
Pinout & Package
MAX154AENG+ is housed in a 24-pin narrow plastic DIP package (0.300" width), RoHS-compliant and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | AIN1 | Analog input channel 1 - first of four single-ended inputs, referenced to GND |
| 2 | AIN2 | Analog input channel 2 - second multiplexed input, shares same reference and timing constraints |
| 3 | AIN3 | Analog input channel 3 - third channel; all AINx pins exhibit 45pF capacitance and ±3µA leakage |
| 4 | AIN4 | Analog input channel 4 - final channel in 4-channel mux; no internal connection to A2 (pin 23) |
| 5 | A0 | Multiplexer address bit 0 - selects one of four channels when combined with A1 (pin 6) |
| 6 | A1 | Multiplexer address bit 1 - used with A0 to decode 00–11 for AIN1–AIN4 selection |
| 7 | N.C. | No connect - pin 7 is unconnected internally; must be left floating or tied to GND |
| 8 | VDD | +5V power supply - requires 47µF electrolytic + 0.1µF ceramic bypass to GND at pin |
| 9 | DB0 | Data bus bit 0 (LSB) - three-state output; high-impedance when CS or RD is high |
| 10 | DB1 | Data bus bit 1 - latched output valid after INT assertion or RDY transition in Mode 0 |
| 11 | DB2 | Data bus bit 2 - synchronized to RD/CS edges; load capacitance limited to 50pF for timing compliance |
| 12 | DB3 | Data bus bit 3 - shares same timing parameters as DB0–DB7: tACC1 = 1.6µs, tDH = 40ns |
| 13 | DB4 | Data bus bit 4 - MSB of lower nibble; transitions defined by tRDY (30ns max) and tACC2 (85ns) |
| 14 | DB5 | Data bus bit 5 - driven only when CS and RD are both asserted; VOL ≤ 0.4V at 2.6mA sink |
| 15 | DB6 | Data bus bit 6 - VOH ≥ 2.4V at 1.6mA source; COUT = 5–8pF typical |
| 16 | DB7 | Data bus bit 7 (MSB) - final bit of 8-bit parallel output; matches all timing specs in Table 1 |
| 17 | CS | Chip select input - active-low enable; must be low before RD to initiate conversion |
| 18 | RD | Read input - falling edge with CS low starts conversion; pulse width ≥80ns in Mode 1 |
| 19 | INT | Interrupt output - active-low open-drain signal indicating conversion completion |
| 20 | RDY | Ready output - open-drain, goes low on CS fall and high-impedance at conversion end |
| 21 | VREF+ | Upper reference input - sets full-scale voltage; accepts VDD (up to +5V) or external reference |
| 22 | VREF− | Lower reference input - sets zero-code voltage; connected to GND for 0V–5V range |
| 23 | GND | Ground - analog and digital ground pins are internally common; star grounding recommended |
| 24 | REF OUT | 2.5V reference output - provides buffered 2.5V ±3mV; load limited to 30mA, bypass with 0.01µF |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates need for external sample-and-hold circuitry, reducing board space and signal path error sources |
| On-chip 2.5V reference | Provides stable, factory-trimmed reference with 60ppm/°C drift, enabling self-contained data acquisition |
| Single +5V supply operation | Removes requirement for dual supplies or charge pumps, simplifying power design in embedded systems |
| Memory-mapped or I/O-port interface | Requires no external glue logic - appears as memory location or peripheral port to 8086/8051/Z80-style processors |
| 1/2 LSB total unadjusted error | Guarantees monotonic transfer function and no missing codes across –40°C to +85°C operating range |
Applications
| Telecommunications Signal Monitoring | Digital Signal Processing Front-End |
|---|---|
Use Scenario: Real-time monitoring of line voltage, echo cancellation feedback, or speech bandpass filter outputs in voice-over-PSTN equipment. IC Role / Device Role / Timing Role: MAX154AENG+ serves as the primary digitizer for four analog signal paths, performing sequential 100kHz/channel sampling synchronized to system clock. Use Value: 2.5µs conversion time and integrated track/hold allow direct digitization of 10kHz sinusoids without external hold circuitry, reducing BOM count by one IC per channel. |
Use Scenario: Capturing sensor outputs or control loop feedback signals in FPGA- or DSP-based motor control systems. IC Role / Device Role / Timing Role: MAX154AENG+ acts as the analog interface between physical sensors and programmable logic, delivering time-aligned 8-bit samples to DMA buffers. Use Value: Latched three-state outputs and RD/CS timing compatibility with Z80/8051 buses enable direct connection to processor data bus without wait-state generators or address decoders. |
| High-Speed Servo Control Feedback | Audio Instrumentation Sampling |
Use Scenario: Closed-loop position/velocity sensing in industrial servo drives using resolvers or LVDTs conditioned to 0–5V range. IC Role / Device Role / Timing Role: MAX154AENG+ digitizes four independent feedback channels (phase A/B, current sense, temperature) with deterministic 2.5µs latency. Use Value: ±1/2 LSB error and 45pF input capacitance ensure <0.1% gain error and <1 LSB noise floor when paired with ≤100Ω source impedance drivers. |
Use Scenario: Multi-channel test instrumentation capturing transient audio waveforms, distortion analysis, or harmonic content in studio-grade gear. IC Role / Device Role / Timing Role: MAX154AENG+ functions as a cost-optimized front-end for 4-channel simultaneous sampling, feeding data to PC-based FFT engines. Use Value: Internal 2.5V reference and 0V–5V input range eliminate external reference and level-shift components, cutting calibration complexity and thermal drift contributors. |
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 |
|---|---|---|---|
| MAX154BCNG+ | Same 24-pin DIP package and pinout; wider ±1 LSB total unadjusted error spec (vs. ±1/2 LSB for MAX154AENG+) | Acceptable where 12-bit-equivalent linearity is not required; lower cost for non-critical measurement tasks | Select MAX154BCNG+ only if system-level testing confirms ±1 LSB error meets accuracy budget under worst-case temperature and supply conditions |
| ADS7822U | 8-bit, 200ksps SAR ADC in 8-pin SOIC; no internal reference or track/hold; requires external 2.5V ref and driver | Used in space-constrained designs where 4-channel mux is unnecessary and serial interface is preferred | Choose ADS7822U when board area is critical and system already provides precision reference and fast op-amp drivers; not drop-in compatible |
Compared with MAX154BCNG+, the MAX154AENG+ offers tighter ±1/2 LSB error for metrology-grade acquisition; compared with ADS7822U, it delivers integrated reference, track/hold, and parallel interface at the cost of larger footprint and fixed 4-channel topology.
Availability
MAX154AENG+ is available at Aetrix Electronics and suitable for high-speed data acquisition, telecommunications monitoring, and industrial servo control applications requiring stable component supply across extended temperature ranges.
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) is a fabless semiconductor company specializing in precision analog, mixed-signal, and high-speed data conversion ICs for industrial, communications, and computing markets.
The MAX154AENG+ belongs to Maxim's legacy high-speed ADC product line, designed specifically for embedded systems needing compact, self-contained digitization with minimal external components and deterministic timing.
FAQ
What is the maximum sampling rate achievable with the MAX154AENG+?
The MAX154AENG+ achieves up to 100kHz per channel. This is calculated from its 2.5µs conversion time plus minimum 500ns delay between conversions (tP), yielding 1/(2.5µs + 0.5µs) = 333kHz aggregate rate across four channels, or 100kHz per individual channel. The MAX154AENG+ does not support interleaved or pipelined operation beyond this limit.
Does the MAX154AENG+ require an external clock signal?
No, the MAX154AENG+ does not require an external clock. All timing is derived internally from the RD and CS control signals. Conversion is initiated by the falling edge of RD (with CS low), and internal state machines govern the 2.5µs conversion cycle without external timing inputs. This simplifies system design by eliminating clock distribution and synchronization concerns.
Can the MAX154AENG+ operate with a bipolar input range such as ±2.5V?
The MAX154AENG+ natively supports only unipolar 0V to +5V analog inputs. Bipolar operation requires external signal conditioning - for example, a summing amplifier to shift and scale ±2.5V to 0–5V - as described in Figure 10a of the datasheet. The device itself has no differential input capability or internal offset adjustment for bipolar ranges.
What is the purpose of the REF OUT pin on the MAX154AENG+?
The REF OUT pin on the MAX154AENG+ provides a buffered 2.5V reference output (2.47V to 2.53V at +25°C) with ±6mV load regulation and 60ppm/°C temperature drift. It is intended to serve as a precision reference for external circuitry - such as op-amp biasing or comparator thresholds - and must be bypassed with a 0.01µF capacitor to GND for stability.
How does the MAX154AENG+ handle analog input source impedance?
The MAX154AENG+ requires analog source impedance ≤100Ω to meet its ±1/2 LSB accuracy specification. Its 45pF input capacitance and internal 1µs tracking window mean higher source impedances cause incomplete settling, resulting in gain and linearity errors. For sources >100Ω, an external unity-gain buffer with ≥1MHz loop gain is mandatory before connecting to AIN1–AIN4.
MAX154AENG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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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