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Analog Devices Inc./Maxim Integrated MAX154BCAG+
- Part No.:
- MAX154BCAG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX154BCAG+.pdf
- Description:
- IC ADC 8BIT 400KSPS 24-SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,451
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Product details
Overview
The MAX154BCAG+ from Maxim Integrated is a high-speed 8-bit analog-to-digital converter with four-channel multiplexer, internal 2.5V reference, and built-in track/hold - enabling complete data acquisition in a single SSOP-24 package. It delivers 2.5µs per-channel conversion time, ±1 LSB total unadjusted error, and operates from a single +5V supply across 0°C to +70°C.
For engineers reviewing the MAX154BCAG+ datasheet, MAX154BCAG+ pinout, MAX154BCAG+ application, or MAX154BCAG+ equivalent, this page provides verified technical context, real-world interface timing constraints, channel selection logic, reference stability behavior, and validated alternatives for industrial data logging, telecom signal sampling, and servo feedback systems.
Technical Context
The MAX154BCAG+ 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 range is 0V to +5V (VREF− = GND, VREF+ = VDD), and it supports both Mode 0 (WAIT-state microprocessor interface) and Mode 1 (non-WAIT burst read) via CS and RD control signals only.
It features a 2.5V on-chip reference (±10mV load regulation, 60–100 ppm/°C drift), 45pF analog input capacitance, and 0.7 V/µs minimum slew rate tracking. The device requires no external clock and latches multiplexer address inputs (A0, A1) on CS/RD falling edge to select among AIN1–AIN4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes over full-scale input range |
| Conversion Time | 2.5 µs - defines maximum per-channel sampling rate of 100 kHz |
| Total Unadjusted Error | ±1 LSB - includes offset, gain, and linearity errors at TA = +25°C |
| Analog Input Range | 0V to +5V - set by VREF− = GND and VREF+ = VDD; no external reference needed |
| Reference Output | 2.50 V ±30 mV - stable internal voltage source usable as system reference |
| Supply Voltage | +5V ±5% - single-rail operation eliminates need for dual supplies or regulators |
| Operating Temperature | 0°C to +70°C - commercial-grade thermal range suitable for embedded instrumentation |
Pinout & Package
MAX154BCAG+ is housed in a 24-pin Shrink Small-Outline Package (SSOP) with 0.65 mm lead pitch, 7.07 mm × 8.07 mm body dimensions, and gull-wing leads compatible with standard surface-mount reflow processes.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | AIN1 | Analog input channel 1 - selected when A1A0 = 00; accepts 0V–5V signals |
| 2 | AIN2 | Analog input channel 2 - selected when A1A0 = 01; shares same input structure as AIN1 |
| 3 | AIN3 | Analog input channel 3 - selected when A1A0 = 10; internally switched into sample capacitor array |
| 4 | AIN4 | Analog input channel 4 - selected when A1A0 = 11; completes 4-channel multiplexed input set |
| 5 | A0 | Multiplexer address bit 0 - latched on CS/RD falling edge to select input channel LSB |
| 6 | A1 | Multiplexer address bit 1 - latched on CS/RD falling edge to select input channel MSB |
| 7 | VREF− | Reference lower span - tied to GND to define zero-code voltage (0V input → 0x00) |
| 8 | VREF+ | Reference upper span - connected to VDD to define full-scale code (5V input → 0xFF) |
| 9 | GND | Digital/analog ground - common return for VDD, reference, and digital I/O |
| 10 | INT | Interrupt output - open-drain active-low signal indicating conversion completion |
| 11 | RDY | Ready output - open-drain status signal for microprocessor WAIT input |
| 12 | CS | Chip-select input - active-low enable for address latching and conversion start |
| 13 | RD | Read input - controls data access and conversion initiation in Mode 0 or Mode 1 |
| 14 | DB0 | Data bus bit 0 (LSB) - three-state output driven after conversion completes |
| 15 | DB1 | Data bus bit 1 - synchronized with DB0–DB7; high-impedance when CS high |
| 16 | DB2 | Data bus bit 2 - directly connectable to 8-bit microprocessor data bus without glue logic |
| 17 | DB3 | Data bus bit 3 - latched output valid within tACC1 = 2.0 µs after RD assertion |
| 18 | DB4 | Data bus bit 4 - shares same timing and drive strength as DB0–DB3 |
| 19 | DB5 | Data bus bit 5 - output capacitance ≤8 pF ensures clean signal integrity at 100 kHz sampling |
| 20 | DB6 | Data bus bit 6 - VOH ≥4.0 V @ 1.6 mA supports TTL/CMOS level compatibility |
| 21 | DB7 | Data bus bit 7 (MSB) - completes 8-bit parallel output word for immediate CPU read |
| 22 | REF OUT | 2.5V reference output - buffered internal voltage source for external circuitry use |
| 23 | VDD | +5V power supply - powers analog core, reference, and digital interface; bypass with 47µF + 0.1µF |
| 24 | N.C. | No connect - pin 24 is unused and must remain floating or grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates external THS requirement and associated board space, cost, and settling uncertainty |
| On-chip 2.5V reference | Provides stable, temperature-compensated reference without external components or trimming |
| Single +5V supply | Removes need for ±5V rails or charge pumps - simplifies power design and reduces BOM count |
| No external clock required | Internal timing generator enables autonomous conversion triggered solely by CS/RD edges |
| Memory-mapped or I/O-port interface | Appears as memory location or peripheral port to microprocessors - no address decoding logic needed |
Applications
| Industrial Data Acquisition | Telecom Signal Sampling |
|---|---|
Use Scenario: Real-time monitoring of sensor outputs (temperature, pressure, current) in PLC modules and distributed I/O systems. IC Role / Device Role / Timing Role: MAX154BCAG+ serves as the primary front-end ADC, digitizing up to four analog channels at 100 kHz per channel with deterministic 2.5 µs latency. Use Value: Built-in track/hold and internal reference ensure consistent accuracy across varying sensor source impedances and ambient temperatures without calibration. |
Use Scenario: Digitizing filtered voice-band signals (300 Hz–3.4 kHz) in channel banks and codec interfaces. IC Role / Device Role / Timing Role: MAX154BCAG+ acts as a low-latency, multi-channel sampling engine synchronized to telephony timing clocks. Use Value: 2.5 µs conversion time supports >400 kHz aggregate sampling, enabling oversampling for noise shaping and alias rejection in narrowband systems. |
| High-Speed Servo Feedback | Audio Instrumentation |
Use Scenario: Closed-loop position/velocity sensing in motor drives using resolvers or Hall-effect sensors. IC Role / Device Role / Timing Role: MAX154BCAG+ captures analog feedback signals (e.g., current sense, encoder analog outputs) with sub-microsecond timing alignment to PWM cycles. Use Value: ±1 LSB error and 0.7 V/µs slew rate support accurate reconstruction of fast-changing motor currents up to 10 kHz bandwidth. |
Use Scenario: Multi-channel waveform capture in portable audio analyzers and test equipment. IC Role / Device Role / Timing Role: MAX154BCAG+ functions as a compact, self-contained ADC subsystem for simultaneous sampling of microphone preamp outputs or line-level sources. Use Value: SSOP-24 footprint and single-supply operation allow integration into space-constrained handheld instruments without external reference or clock ICs. |
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 | 2.5 µs conversion, but SPI interface (not parallel); 2.7V–5.25V supply; no internal reference | Requires external reference and serial interface logic; better suited for low-pin-count MCU designs | Select if board space is critical and serial interface acceptable; avoid if parallel bus timing or internal reference is required |
| MAX1113ECM+ | 8-bit, 4-channel, but 3 µs conversion; internal 2.048V reference; +2.7V to +3.6V supply only | Lower supply voltage limits use in +5V systems; 2.048V reference incompatible with 0–5V input scaling | Choose only for battery-powered +3.3V systems needing identical channel count; not drop-in for MAX154BCAG+ |
Compared with ADS7822U and MAX1113ECM+, the MAX154BCAG+ uniquely combines parallel 8-bit output, internal 2.5V reference, +5V single-supply operation, and deterministic 2.5 µs conversion - making it optimal for legacy microprocessor-based data loggers and industrial controllers requiring minimal interface overhead.
Availability
MAX154BCAG+ is available at Aetrix Electronics and suitable for industrial data acquisition, telecom signal sampling, and high-speed servo feedback systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX154BCAG+ 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 high-performance analog and mixed-signal ICs for industrial, communications, and computing applications.
The MAX154BCAG+ belongs to Maxim's precision data acquisition product line, designed specifically for compact, high-speed, self-contained ADC solutions in space- and power-constrained embedded systems.
FAQ
What is the maximum sampling rate achievable with the MAX154BCAG+?
The MAX154BCAG+ achieves a per-channel sampling rate of 100 kHz, calculated from its 2.5 µs conversion time plus 500 ns minimum delay between conversions. This allows full utilization of its 4-channel multiplexer in time-interleaved configurations while maintaining Nyquist compliance for up to 10 kHz analog input bandwidths. The MAX154BCAG+ does not require external clocking to sustain this rate.
Does the MAX154BCAG+ require an external reference voltage?
No, the MAX154BCAG+ includes a fully integrated 2.5V reference with ±30 mV initial accuracy, 60–100 ppm/°C temperature drift, and ±10 mV load regulation. It can operate with VREF− tied to GND and VREF+ tied to VDD to define a 0V–5V input range. External reference is optional only if higher precision or non-standard spans are needed - the MAX154BCAG+ functions completely autonomously with its internal reference.
How does the MAX154BCAG+ interface with a microprocessor without WAIT-state capability?
The MAX154BCAG+ supports Mode 1 interface operation for microprocessors lacking WAIT-state support. In this mode, a single CS/RD pulse initiates conversion and simultaneously reads the previous result from DB0–DB7. A second pulse - spaced ≥2.5 µs later - retrieves the newly converted data. This eliminates processor stalling while preserving deterministic timing, and the MAX154BCAG+'s INT and RDY outputs remain functional for optional synchronization.
What is the purpose of the N.C. pin on the MAX154BCAG+ SSOP package?
Pin 24 of the MAX154BCAG+ is designated N.C. (No Connect) and is electrically isolated from all internal circuitry. It must be left unconnected - neither tied to VDD nor GND - to prevent parasitic coupling or package stress-induced parameter shifts. This pin exists for mechanical symmetry and package compatibility across the MAX154 family; its presence does not imply future functionality or alternate variants in the MAX154BCAG+.
Can the MAX154BCAG+ handle bipolar analog inputs?
The MAX154BCAG+ is inherently unipolar (0V–5V input range), but bipolar operation (e.g., ±4V) is supported externally using op-amp signal conditioning as shown in Figure 10a of the datasheet. The MAX154BCAG+ itself does not include differential input stages or programmable offset; achieving bipolar input requires external circuitry to shift and scale the signal into the 0V–5V window, with output codes interpreted as offset binary. No modification to the MAX154BCAG+ is needed - the same MAX154BCAG+ device is used.
MAX154BCAG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX154BCAG+ FAQ
1.How can I place an order for MAX154BCAG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX154BCAG+ 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 MAX154BCAG+ reliable?
The price and inventory of MAX154BCAG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX154BCAG+ is usually 5 days.
3.What payment methods are accepted for MAX154BCAG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX154BCAG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX154BCAG+?
MAX154BCAG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX154BCAG+ 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 MAX154BCAG+?
For technical support, including MAX154BCAG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX154BCAG+ requirements.
6.How does Aetrix verify that MAX154BCAG+ is sourced from the original manufacturer or authorized distributors?
All MAX154BCAG+ 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 MAX154BCAG+ meets industry standards.
7.What is the process for return or replacement of MAX154BCAG+?
All MAX154BCAG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX154BCAG+, 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 MAX154BCAG+ part is unused and in its original packaging.
Return procedure for MAX154BCAG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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