My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX156BENG+
- Part No.:
- MAX156BENG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
MAX156BENG+.pdf
- Description:
- IC ADC 8BIT 8CH T/H&REF 24-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:255
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX156BENG+ from Maxim Integrated is a high-speed, 4-channel, 8-bit analog-to-digital converter (ADC) with simultaneous track-and-hold (T/H) inputs for phase-coherent sampling across all channels. It delivers 3.6µs per-channel conversion time, supports unipolar/bipolar and single-ended/differential input configurations, and integrates a 2.5V internal reference - enabling complete data-acquisition functionality in portable power meters and vibration analysis systems.
For engineers reviewing the MAX156BENG+ datasheet, MAX156BENG+ pinout, MAX156BENG+ application, or MAX156BENG+ equivalent, this page provides verified technical context, real-world interface timing constraints, confirmed package mapping to 24-pin narrow PDIP, and validated alternative options for multichannel, simultaneous-sampling ADC designs.
Technical Context
The MAX156BENG+ implements a successive-approximation ADC core with eight independent T/H amplifiers (four active in MAX156), all sampling simultaneously on the WR falling edge. Its configuration register - accessed via bidirectional D0–D7 pins - controls channel selection (A0–A2), bipolar/single-ended mode (BIP), differential/single-ended mode (DIFF), power-down (PD), and inhibit (INH) functions.
It operates from single +5V or dual ±5V supplies, with VSS = 0V or −5V enabling extended bipolar input ranges. Conversion results are stored in an internal 8×8 RAM and read sequentially via RD pulses, supporting both hard-wired (MODE pin-strapped) and programmable I/O modes without external memory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - guarantees monotonic output with no missing codes over full temperature range. |
| Conversion Time | 3.6 µs per channel - enables up to 220 kSPS aggregate throughput for 4-channel acquisition. |
| Input Channels | 4 analog inputs (AIN0–AIN3) - each with dedicated track/hold amplifier for simultaneous sampling. |
| Reference | 2.5V internal reference (REFOUT) - stable ±100 ppm/°C drift, bypassed with 4.7µF + 0.1µF for <1 LSB error. |
| Supply Range | +4.75V to +5.25V (VDD); 0V or −5V (VSS) - supports unipolar 0–2.5V or bipolar ±2.5V input ranges. |
| Accuracy | ±1 LSB integral linearity (MAX15_B grade), ±1 LSB gain error - specified over 0°C to +70°C (C-grade). |
| Digital Interface | Parallel 8-bit bidirectional bus (D0–D7) with CS/WR/RD/BUSY control - requires no external address latches. |
Pinout & Package
MAX156BENG+ is packaged in a 24-pin narrow plastic DIP (PDIP) with 0.3-inch body width and 0.1-inch lead pitch. Pin 1 is marked with a notch or dot; pin numbering follows standard counter-clockwise convention from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | AIN0–AIN3 | Analog input channels - each connected to dedicated track/hold amplifier; sampled simultaneously on WR falling edge. |
| 5 | MODE | Mode select - open-circuit enables I/O mode; tied low/high with VSS selects hard-wired 4-/8-channel configurations. |
| 6 | VSS | Negative supply - connect to AGND (0V) for unipolar operation or −5V for extended bipolar input range. |
| 7 | CS | Chip select - must be low for WR/RD to be recognized; enables multi-device bus sharing. |
| 8 | RD | Read strobe - low pulse reads next sequential RAM location (channel result); auto-increments address counter. |
| 9 | WR | Write strobe - rising edge updates configuration register; falling edge triggers simultaneous sampling of all AINs. |
| 10 | BUSY | Active-low status - indicates conversion in progress; goes high when all selected channel results are stored in RAM. |
| 11 | CLK | External clock input - accepts 0.5–5 MHz TTL/CMOS clock; determines conversion timing and acquisition window. |
| 12–19 | D7/ALL to D0/A0 | Bidirectional data/address bus - shared function: D7–D0 for data output, A2–A0 for RAM address during INH=1 reads. |
| 20 | DGND | Digital ground - separate from AGND to minimize digital noise coupling into analog signal path. |
| 21 | REFOUT | 2.5V reference output - requires 4.7µF electrolytic + 0.1µF ceramic bypass to AGND for stability. |
| 22 | REFIN | Reference input - accepts external 2.375–2.625V reference; REFOUT must be bypassed or tied to VDD if unused. |
| 23 | AGND | Analog ground - star-point connection for all analog return paths, isolated from DGND except at single point. |
| 24 | VDD | Positive supply - +4.75V to +5.25V; bypassed with 47µF + 0.1µF to AGND to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous track/hold sampling | Four independent T/H amplifiers sample AIN0–AIN3 at identical instants - eliminates inter-channel timing skew for phase-sensitive measurements. |
| Mixed-input configuration support | Per-channel selection of unipolar/bipolar and single-ended/differential modes - enables heterogeneous sensor interfacing in one acquisition cycle. |
| Configurable conversion sequencing | ALL bit enables single WR pulse to convert all pre-configured channels; INH bit allows safe register update without triggering conversion. |
| Integrated 2.5V reference with low drift | ±100 ppm/°C temperature coefficient and ±0.25 LSB power-supply rejection - eliminates need for external precision reference in cost-sensitive designs. |
| Power-down with register retention | PD bit reduces IDD to ≤100 µA while preserving mux configuration - enables rapid wake-up (<5ms with internal ref, <50µs with external ref) without reprogramming. |
Applications
| Phase-Sensitive Data Acquisition | Vibration and Waveform Analysis |
|---|---|
|
Use Scenario: Capturing synchronized voltage/current waveforms in motor drive feedback loops to compute real-time phase angle and power factor. IC Role / Device Role / Timing Role: Simultaneous sampling of 4 analog inputs ensures zero inter-channel phase error between current shunt, DC bus, and two phase voltages. Use Value: Enables accurate vector calculations without software interpolation or hardware delay matching - critical for Class 0.2 energy metering compliance. |
Use Scenario: Monitoring bearing vibration signatures in industrial pumps using piezoelectric accelerometers on multiple axes. IC Role / Device Role / Timing Role: Four-channel simultaneous sampling captures coherent time-domain waveforms across X/Y/Z and temperature sensors for FFT-based fault detection. Use Value: Eliminates aliasing artifacts from sequential sampling - preserves harmonic content up to 4 MHz small-signal bandwidth for early-stage defect identification. |
| DSP Analog Input Interface | Portable Data Loggers |
|
Use Scenario: Feeding real-time sensor data (strain, pressure, temp) into fixed-point DSP for adaptive filtering and anomaly detection. IC Role / Device Role / Timing Role: Parallel 8-bit interface with BUSY handshake delivers deterministic latency (<3.8 µs max) for tight DSP interrupt-driven acquisition windows. Use Value: Reduces CPU overhead versus SPI/I²C ADCs - frees >15% of MIPS budget for algorithm execution instead of data movement. |
Use Scenario: Battery-powered environmental monitoring units logging temperature, humidity, and CO₂ across remote sites for 6+ months. IC Role / Device Role / Timing Role: Power-down mode draws ≤100 µA while retaining configuration - enables microcontroller-triggered wake-up and burst acquisition. Use Value: Extends battery life by 3.2× versus always-on ADCs; internal reference avoids calibration drift across −20°C to +60°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel, simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7824KRZ | 4-channel, 8-bit, 10 µs conversion time; no internal reference; requires external 2.5V ref and external T/H. | Higher power (25 mA vs. 12 mA), larger PCB footprint due to external components - less suitable for space-constrained portable loggers. | Select AD7824KRZ only when higher SNR (>50 dB) is required and board area permits discrete T/H + reference design. |
| ADS8325IPW | Single-channel, 16-bit, 250 kSPS; SPI interface; no simultaneous sampling - requires external multiplexer and T/H for multichannel use. | Lacks inherent channel synchronization; introduces >100 ns inter-channel skew even with ideal mux - unsuitable for phase-critical acquisition. | Choose ADS8325IPW for high-resolution single-sensor applications (e.g., precision thermocouple measurement), not for coherent multichannel capture. |
Compared with AD7824KRZ and ADS8325IPW, the MAX156BENG+ uniquely integrates simultaneous T/H, internal reference, and parallel interface in a compact 24-pin PDIP - delivering lower system BOM count, guaranteed inter-channel coherence, and faster time-to-data for embedded acquisition systems.
Availability
MAX156BENG+ is available at Aetrix Electronics and suitable for portable data loggers, AC power meters, and industrial vibration monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX156BENG+ 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, medical, and communications applications - emphasizing integration, reliability, and performance under real-world conditions.
The MAX155/MAX156 family was engineered specifically for high-fidelity, multichannel data acquisition where timing coherence across inputs is non-negotiable - targeting test equipment, energy metering, and predictive maintenance systems.
FAQ
What is the maximum sampling rate achievable with the MAX156BENG+ in 4-channel simultaneous mode?
The MAX156BENG+ completes each channel conversion in 3.6 µs. In 4-channel simultaneous mode, one WR pulse initiates sampling of all four channels, and results are stored sequentially in RAM. With consecutive RD pulses, the full 4-channel dataset is accessible within 3.6 µs × 4 = 14.4 µs - enabling an effective aggregate sampling rate of 220 kSPS. This assumes fCLK = 5 MHz and no bus contention.
Does the MAX156BENG+ require external track-and-hold amplifiers?
No, the MAX156BENG+ does not require external track-and-hold amplifiers. It integrates four independent, high-input-impedance T/H circuits - one per analog input (AIN0–AIN3) - that sample simultaneously on the WR falling edge. This eliminates external T/H components and associated layout complexity, reducing system cost and inter-channel timing mismatch.
Can the MAX156BENG+ operate with a single +3.3V supply?
No, the MAX156BENG+ is not rated for +3.3V operation. Its absolute maximum VDD is +6V, but the specified operating range is +4.75V to +5.25V. Electrical characteristics - including reference accuracy, conversion time, and input range - are guaranteed only within this 5V ±5% window. Using +3.3V will result in undefined behavior, failed conversions, or permanent damage.
How is bipolar input range achieved on the MAX156BENG+?
Bipolar input range (±2.5V) on the MAX156BENG+ is achieved by connecting VSS to −5V and setting the BIP bit (D5) to logic 1 in the configuration register. This configures the ADC's front-end to center the conversion around AGND, allowing inputs from −2.5V to +2.5V relative to AGND. The internal 2.5V reference remains active and defines the full-scale span.
What is the purpose of the MODE pin on the MAX156BENG+?
The MODE pin on the MAX156BENG+ selects between two operational modes: when left open-circuit, it enables I/O mode - allowing full programmability of channel configuration via D0–D7. When hard-wired low or high with VSS, it activates predefined 4-channel or 8-channel conversion sequences without register programming - simplifying firmware for fixed-function applications like basic power metering.
MAX156BENG+ 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:
- -
MAX156BENG+ FAQ
1.How can I place an order for MAX156BENG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX156BENG+ 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 MAX156BENG+ reliable?
The price and inventory of MAX156BENG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX156BENG+ is usually 5 days.
3.What payment methods are accepted for MAX156BENG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX156BENG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX156BENG+?
MAX156BENG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX156BENG+ 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 MAX156BENG+?
For technical support, including MAX156BENG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX156BENG+ requirements.
6.How does Aetrix verify that MAX156BENG+ is sourced from the original manufacturer or authorized distributors?
All MAX156BENG+ 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 MAX156BENG+ meets industry standards.
7.What is the process for return or replacement of MAX156BENG+?
All MAX156BENG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX156BENG+, 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 MAX156BENG+ part is unused and in its original packaging.
Return procedure for MAX156BENG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX156BENG+ Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
