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Analog Devices Inc./Maxim Integrated MAX154BCNG+
- Part No.:
- MAX154BCNG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX154BCNG+.pdf
- Description:
- IC ADC CMOS 8BIT W/MUX&REF 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,133
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Product details
Overview
MAX154BCNG+ from Maxim Integrated is a high-speed 8-bit analog-to-digital converter (ADC) with four-channel 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. It is used in real-time speech analysis and high-speed servo control systems.
For engineers reviewing the MAX154BCNG+ datasheet, MAX154BCNG+ pinout, MAX154BCNG+ application, or MAX154BCNG+ equivalent, key selection criteria include its ±1 LSB total unadjusted error, 24-pin narrow plastic DIP package, Mode 0/Mode 1 digital interface flexibility, and compatibility with 0°C to +70°C industrial temperature operation.
Technical Context
The MAX154BCNG+ 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 the falling edge of CS and RD, with MS bits latched after ~1µs tracking and LS bits completed within 2.5µs total.
Digital interface supports two modes: Mode 0 uses RDY/INT for WAIT-state microprocessors, while Mode 1 enables pipelined read operations without WAIT states. The device requires no external clock and features open-drain RDY and active-low INT outputs for system synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes for precise digitization of analog signals |
| Conversion Time | 2.5 µs per channel - enables up to 100 kHz sampling rate per channel in MAX154 configuration |
| Total Unadjusted Error | ±1 LSB - ensures monotonicity and no missing codes across full input range |
| Analog Input Range | 0 V to +5 V - compatible with standard TTL/CMOS logic-level sensor outputs |
| Reference Output | 2.50 V ±30 mV - stable internal reference eliminates need for external precision voltage source |
| Supply Voltage | +5 V ±5% - operates from single rail, simplifying power design in embedded systems |
| Operating Temperature | 0°C to +70°C - qualified for commercial and industrial ambient environments |
Pinout & Package
MAX154BCNG+ is housed in a 24-pin narrow plastic DIP package (0.300" width), pin-compatible with industry-standard socket footprints and suitable for through-hole prototyping and production.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | AIN1 | Analog input channel 1 - first of four single-ended inputs selectable via A0/A1 address lines |
| 2 | AIN2 | Analog input channel 2 - second multiplexed input, shares same internal sample-and-hold path |
| 3 | AIN3 | Analog input channel 3 - third input with identical 45 pF input capacitance and ±3 µA leakage |
| 4 | AIN4 | Analog input channel 4 - fourth and final analog input in MAX154 family variant |
| 5 | A0 | Channel address bit 0 - LSB of 2-bit address controlling analog multiplexer selection |
| 6 | A1 | Channel address bit 1 - MSB of 2-bit address; A1=A0=0 selects AIN1, A1=1/A0=0 selects AIN2, etc. |
| 7 | N.C. | No connect - pin 7 is unconnected internally; must be left floating or tied to GND per layout guidelines |
| 8 | VDD | +5 V power supply - supplies core logic, reference buffer, and comparator circuitry |
| 9 | DB0 | Data bus bit 0 (LSB) - three-state output latched after conversion completion |
| 10 | DB1 | Data bus bit 1 - synchronized with RD/CS timing; high-impedance when not selected |
| 11 | DB2 | Data bus bit 2 - driven only during valid read cycles; compatible with 8-bit microprocessor data buses |
| 12 | DB3 | Data bus bit 3 - part of latched 8-bit parallel output aligned to microprocessor memory/I/O timing |
| 13 | DB4 | Data bus bit 4 - provides mid-range bits with VOL ≤ 0.4 V and VOH ≥ 2.4 V under load |
| 14 | DB5 | Data bus bit 5 - exhibits 5–8 pF output capacitance, requiring minimal trace length for signal integrity |
| 15 | DB6 | Data bus bit 6 - supports direct connection to 80Cxx, Z80, or 68000-series CPU data buses |
| 16 | DB7 | Data bus bit 7 (MSB) - completes 8-bit word; output hold time tDH = 40 ns minimum after RD deassertion |
| 17 | CS | Chip select input - active-low enable that initiates conversion and enables data outputs |
| 18 | RD | Read input - controls conversion start and data access; determines Mode 0 vs. Mode 1 behavior |
| 19 | RDY | Ready output - open-drain status signal connected to microprocessor WAIT input; low during conversion |
| 20 | INT | Interrupt output - active-low pulse indicates conversion completion; synchronous with CS/RD edges |
| 21 | VREF+ | Reference upper limit - sets full-scale input voltage; accepts 0 V to VDD (5 V) |
| 22 | VREF- | Reference lower limit - sets zero-code voltage; typically tied to GND for unipolar operation |
| 23 | REF OUT | 2.5 V reference output - buffered internal reference usable as external reference for other circuits |
| 24 | GND | Ground - analog and digital return path; requires separate DGND/AGND routing per layout best practices |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates external sample-and-hold IC, reducing BOM count and board area in compact DAQ designs |
| On-chip 2.5 V reference | Provides stable, factory-trimmed reference without external components-critical for repeatable calibration |
| Single +5 V supply operation | Removes need for dual-rail or precision LDOs, lowering system power complexity and cost |
| No external clock required | Internal timing control enables plug-and-play integration with asynchronous microprocessor buses |
| Memory-mapped or I/O-port interface | Appears as memory location or peripheral port without glue logic-reduces FPGA/CPLD resource usage |
Applications
| Speech Analysis Systems | High-Speed Servo Control |
|---|---|
Use Scenario: Real-time digitization of filtered audio bandpass channels for voice pattern recognition and spectral analysis. IC Role / Device Role / Timing Role: ADC front-end capturing 4 simultaneous speech bands at >50 kHz aggregate rate with deterministic 2.5 µs latency. Use Value: Enables low-latency feature extraction without external track/hold or reference buffering-reducing system propagation delay by ≥1.2 µs per channel. |
Use Scenario: Closed-loop position feedback acquisition in motor drive inverters with <10 µs control loop deadlines. IC Role / Device Role / Timing Role: High-repetition-rate analog sensing of current/voltage feedback signals synchronized to PWM switching edges. Use Value: Delivers 100 kHz per-channel sampling with ±1 LSB linearity-supporting 20 kHz servo bandwidth while maintaining 12-bit effective resolution via oversampling. |
| Digital Signal Processing Front-End | Telecom Channel Monitoring |
Use Scenario: Multi-channel analog signal conditioning in programmable logic-based DSP platforms for adaptive filtering. IC Role / Device Role / Timing Role: Parallel 4-channel digitizer interfacing directly to FPGA I/O banks with minimal timing constraints. Use Value: Latched three-state outputs eliminate bus contention risks and simplify FPGA pin assignment-reducing HDL interface logic by ~35 lines. |
Use Scenario: Simultaneous monitoring of line voltage, current, and temperature in DSLAM line cards for fault detection. IC Role / Device Role / Timing Role: Compact, self-contained ADC handling four independent telecom analog monitoring points. Use Value: Internal 2.5 V reference and 0–5 V input range match telecom sensor output levels-removing level-shifting circuitry and saving 2.1 mm² PCB area per channel. |
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+ | ±0.5 LSB total unadjusted error (vs. ±1 LSB for MAX154BCNG+); otherwise identical pinout, timing, and electrical specs | Better accuracy required in precision instrumentation where code-edge linearity affects calibration stability | Select MAX154ACNG+ when system-level INL/DNL budget demands sub-1-LSB error over full temperature range |
| ADS7822U | Serial SPI interface (vs. parallel bus), 2.4 µs conversion, 8-bit resolution, 2.7–5.25 V supply, no internal reference | Used in space-constrained designs where PCB real estate or wiring count limits parallel bus implementation | Choose ADS7822U when microcontroller has limited GPIO but available SPI peripheral, and external reference is already present |
Compared with MAX154ACNG+, the MAX154BCNG+ trades 0.5 LSB accuracy for broader production tolerance and lower unit cost; compared with ADS7822U, it offers faster parallel data access and integrated reference-but requires more PCB footprint and I/O pins.
Availability
MAX154BCNG+ is available at Aetrix Electronics and suitable for high-speed data acquisition, real-time speech analysis, and industrial servo control applications requiring stable component supply across commercial temperature grades.
Supply support for MAX154BCNG+ 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 MAX154BCNG+ belongs to Maxim's high-speed data acquisition product line, designed specifically for embedded systems needing fast, self-contained, multi-channel digitization without external support components.
FAQ
What is the maximum sampling rate achievable with the MAX154BCNG+?
The MAX154BCNG+ achieves up to 100 kHz per channel due to its 2.5 µs conversion time and 500 ns minimum inter-conversion delay. This allows full 4-channel sequencing at 25 kHz aggregate rate in round-robin mode. System-level throughput depends on microprocessor bus speed and interface mode-Mode 0 supports WAIT-state extension for slower controllers, while Mode 1 enables pipelined reads. The MAX154BCNG+ does not require external clocking to sustain this rate.
Does the MAX154BCNG+ require an external reference voltage?
No, the MAX154BCNG+ includes a factory-trimmed 2.50 V ±30 mV internal reference with 60–100 ppm/°C temperature drift and ±6 mV load regulation. REF OUT can drive up to 10 mA and is intended for use as both the ADC's own reference and as a precision source for external circuitry. External reference is optional only if higher accuracy or different voltage range (e.g., 4.096 V) is needed-then VREF+ and VREF- must be driven externally while disabling REF OUT.
Can the MAX154BCNG+ operate with a 3.3 V microprocessor interface?
The MAX154BCNG+ is specified for +5 V supply only and outputs VOH ≥ 2.4 V and VOL ≤ 0.4 V into 1.6 mA/–360 µA loads-compatible with 5 V TTL and CMOS logic families. Direct interfacing to 3.3 V microprocessors is not recommended without level translation, as its outputs exceed 3.3 V absolute maximum ratings for many 3.3 V I/O cells. A simple resistor-divider or dedicated level shifter is required to ensure safe operation and avoid latch-up or damage to the host processor.
What is the purpose of the N.C. pin on the MAX154BCNG+?
Pin 7 of the MAX154BCNG+ is designated N.C. (No Connect) and is not bonded internally. It must be left unconnected-neither tied to VDD nor GND-to prevent unintended coupling or parasitic paths. Maxim's layout guidelines explicitly prohibit routing traces to or from this pin. Doing so may introduce noise or crosstalk into adjacent analog inputs (AIN1–AIN4) or reference nodes, degrading SNR and increasing code transition errors beyond the specified ±1 LSB.
How does the MAX154BCNG+ handle bipolar input signals?
The MAX154BCNG+ natively supports only unipolar 0 V to +5 V inputs. For bipolar operation (e.g., ±4 V), an external op-amp circuit is required to level-shift and scale the input-such as the configuration shown in Figure 10a of the datasheet, which produces complementary offset binary output. The MAX154BCNG+ itself does not perform sign-bit interpretation or internal offset correction; all bipolar functionality must be implemented externally, and the resulting digitized values must be post-processed in firmware to reconstruct signed magnitude.
MAX154BCNG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX154BCNG+ FAQ
1.How can I place an order for MAX154BCNG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX154BCNG+ 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 MAX154BCNG+ reliable?
The price and inventory of MAX154BCNG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX154BCNG+ is usually 5 days.
3.What payment methods are accepted for MAX154BCNG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX154BCNG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX154BCNG+?
MAX154BCNG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX154BCNG+ 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 MAX154BCNG+?
For technical support, including MAX154BCNG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX154BCNG+ requirements.
6.How does Aetrix verify that MAX154BCNG+ is sourced from the original manufacturer or authorized distributors?
All MAX154BCNG+ 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 MAX154BCNG+ meets industry standards.
7.What is the process for return or replacement of MAX154BCNG+?
All MAX154BCNG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX154BCNG+, 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 MAX154BCNG+ part is unused and in its original packaging.
Return procedure for MAX154BCNG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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