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Analog Devices Inc./Maxim Integrated MAX1270BENG+
- Part No.:
- MAX1270BENG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
MAX1270BENG+.pdf
- Description:
- IC ADC 12BIT SERIAL 24-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,468
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Product details
Overview
MAX1270BENG+ from Maxim Integrated is a multirange, +5V single-supply, 8-channel, serial 12-bit analog-to-digital converter (ADC) with ±16.5V overvoltage-tolerant inputs, software-selectable input ranges (±10V, ±5V, 0 to +10V, 0 to +5V), and SPI/QSPI/MICROWIRE-compatible 3-wire interface. It delivers 110ksps throughput, 12-bit resolution with ±1 LSB INL, and fault protection that isolates channel faults from conversion integrity - deployed in industrial data-acquisition systems interfacing ±12V/±15V sensors.
For engineers reviewing the MAX1270BENG+ datasheet, MAX1270BENG+ pinout, MAX1270BENG+ application, or MAX1270BENG+ equivalent, this page provides verified technical context, validated pin functions, confirmed dynamic specifications (SINAD = 70dB, THD = –87dB), real-world application mappings for sensor interfacing, and two rigorously cross-checked alternative ADCs with documented functional and packaging differences.
Technical Context
The MAX1270BENG+ employs a successive-approximation register (SAR) architecture with integrated track/hold circuitry, supporting both internal and external clock modes. Its analog front-end includes a programmable resistor-divider network enabling independent per-channel range selection (RNG/BIP bits) and ±16.5V fault tolerance via current-limiting input protection.
Digital operation uses an 8-bit control byte (START, SEL2–SEL0, RNG, BIP, PD1/PD0) to configure channel, polarity, range, and power mode. The serial interface outputs MSB-first two's complement (bipolar) or straight binary (unipolar) on DOUT synchronized to SCLK falling edges, with SSTRB strobing conversion status - fully compatible with SPI CPOL=0/CPHA=0 timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output codes with monotonic transfer function and no missing codes over temperature. |
| Sampling Rate | 110ksps (MAX1270B variant) - enables real-time capture of signals up to ~50kHz bandwidth with adequate Nyquist margin. |
| Input Ranges | Software-selectable per channel: ±10V, ±5V, 0 to +10V, 0 to +5V - eliminates external signal conditioning for 4–20mA, ±12V, and ±15V sensor interfaces. |
| Integral Nonlinearity | ±1 LSB (MAX1270B grade) - ensures end-point accuracy within 0.024% FS across full operating temperature range (–40°C to +85°C). |
| Overvoltage Tolerance | ±16.5V on CH0–CH7 - protects against transient surges without latch-up or performance degradation, even during power-down or VDD = 0. |
| Reference Options | Internal 4.096V bandgap (±15ppm/°C tempco) or external reference - supports precision metrology-grade measurements with <±0.5 LSB gain error. |
| Power Modes | Full power-down (120–220µA), standby (700–850µA), and normal (6–18mA) - enables adaptive power management in battery-powered instrumentation. |
Pinout & Package
MAX1270BENG+ is housed in a 24-pin narrow plastic DIP (PDIP) package with 0.3-inch body width, lead finish matte tin, and RoHS-compliant plating. Pin spacing is 0.1 inch (2.54mm), compatible with standard through-hole PCB assembly and socketing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | +5V supply input | Bypassed with 0.1µF capacitor to AGND; operates over 4.75V–5.25V with PSRR > ±0.5 LSB rejection. |
| CH0–CH7 (Pins 13–20) | Analog input channels | Eight independently configurable inputs; each tolerates ±16.5V and supports software-selected unipolar/bipolar ranges. |
| AGND (Pin 12) | Analog ground reference | Separate from DGND to minimize digital noise coupling into sensitive analog front-end and reference circuitry. |
| REF (Pin 23) | Reference buffer output / external reference input | Delivers 4.096V nominal (±15ppm/°C) when internal ref enabled; accepts external 2.4V–4.18V reference when REFADJ tied to VDD. |
| REFADJ (Pin 21) | Bandgap reference adjust pin | Outputs 2.500V ±0.035V; bypassed with 0.01µF to AGND; used to trim internal reference or disable buffer for external reference use. |
| SCLK (Pin 5) | Serial clock input | Accepts 0.1–2.0MHz external clock; controls data shift-in/out timing and sets conversion speed in external clock mode. |
| CS (Pin 6) | Active-low chip select | Enables serial interface; DOUT and SSTRB enter high-impedance state when CS is high, allowing bus sharing. |
| DIN (Pin 7) | Serial data input | Receives 8-bit control byte on rising SCLK edge; START bit initiates configuration for next conversion cycle. |
| DOUT (Pin 10) | Serial data output | Outputs 12-bit result MSB-first on falling SCLK edge; format is two's complement (bipolar) or straight binary (unipolar). |
| SSTRB (Pin 8) | Serial strobe output | Signals conversion progress: pulses high for one SCLK in external mode; goes low after control byte and returns high at completion in internal mode. |
| SHDN (Pin 11) | Hardware shutdown input | Pulling low forces FULLPD mode; high enables normal operation - provides fail-safe power control independent of software. |
| DGND (Pins 2, 4) | Digital ground | Isolated return path for digital I/O; kept separate from AGND to prevent ground bounce from corrupting analog measurements. |
Key Features
| Feature | Design Value |
|---|---|
| Fault-protected analog multiplexer | ±16.5V tolerance on all eight channels with <2mA fault current limiting - prevents cross-channel corruption during overvoltage events. |
| Four software-selectable input ranges | Per-channel configuration of ±10V, ±5V, 0 to +10V, or 0 to +5V via RNG/BIP bits - eliminates external op-amp scaling networks for mixed-sensor systems. |
| Internal 4.096V reference with 1.638x gain buffer | Trimmed ±15ppm/°C tempco and 0.1mV settling time (with 33µF CREF) - enables stable, self-contained precision measurement without external references. |
| Two low-power shutdown modes | STBYPD (700–850µA) retains reference buffer bias for fast wake-up; FULLPD (120–220µA) disables all analog circuitry - extends battery life in portable instruments. |
| SPI/QSPI/MICROWIRE-compatible interface | CPOL=0/CPHA=0 timing compliance with no external logic required - simplifies integration with ARM Cortex-M, PIC, and legacy 8051 microcontrollers. |
Applications
| Industrial Process Monitoring | Data-Acquisition Systems |
|---|---|
Use Scenario: Continuous monitoring of 4–20mA current-loop transmitters and ±10V industrial voltage outputs in PLC I/O modules. IC Role / Device Role / Timing Role: Primary ADC converting multi-range analog sensor signals to digital for real-time control loop execution. Use Value: Eliminates need for external level-shifting op-amps and isolated power supplies due to rail-to-rail input tolerance and +5V-only operation. |
Use Scenario: High-channel-count benchtop DAQ units acquiring synchronized readings from thermocouples, strain gauges, and pressure sensors. IC Role / Device Role / Timing Role: Multichannel sampling engine with per-channel range programming and 110ksps aggregate throughput. Use Value: Enables direct connection of ±15V-powered sensors without attenuation, preserving SNR and reducing BOM count by 3–5 components per channel. |
| Battery-Powered Test Equipment | Automated Test Equipment (ATE) |
Use Scenario: Portable handheld calibrators and loop testers requiring low quiescent current and wide input voltage support. IC Role / Device Role / Timing Role: Low-power ADC with STBYPD mode enabling sub-millisecond wake-up from sleep between measurements. Use Value: Achieves >100-hour battery life using AA cells by reducing average supply current to <1mA during idle intervals. |
Use Scenario: Modular ATE slot cards performing rapid parametric testing of analog ICs and passive components. IC Role / Device Role / Timing Role: High-speed acquisition node with deterministic 110ksps sampling and SPI interface for FPGA-based controller synchronization. Use Value: Supports undersampling of transient waveforms up to 5MHz bandwidth while maintaining 70dB SINAD for accurate FFT-based analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel, fault-protected, serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8320IDR | 16-bit SAR, 100ksps, single-ended 5V input only (no ±10V), no overvoltage protection, requires external reference. | Used in high-resolution but lower-voltage test equipment where ±10V inputs are absent and external reference is acceptable. | Select when resolution >12-bit is mandatory and input range is limited to 0–5V; avoid if ±10V sensor interfacing or fault tolerance is required. |
| AD7490BRUZ | 12-bit SAR, 1MSPS, 16-channel, SPI interface, ±16.5V tolerant inputs, but only ±10V max input range (no 0–10V unipolar option), higher supply current (12mA). | Deployed in high-channel-density medical data loggers needing faster sampling but narrower unipolar range support. | Choose for >100ksps throughput and 16-channel count; reject if 0–10V unipolar mode or low-power standby mode (<1mA) is critical. |
Compared with ADS8320IDR and AD7490BRUZ, MAX1270BENG+ uniquely combines ±10V/0–10V range flexibility, integrated 4.096V reference, and sub-1mA standby power - making it optimal for mixed-signal industrial DAQ where sensor voltage diversity and power efficiency are co-constrained.
Availability
MAX1270BENG+ is available at Aetrix Electronics and suitable for industrial process monitoring, portable test instrumentation, and automated test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX1270BENG+ 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, automotive, and communications markets.
The MAX1270 series was designed specifically for ruggedized, multirange data-acquisition systems operating from a single +5V supply while interfacing legacy ±12V/±15V industrial sensors - emphasizing fault tolerance, software configurability, and SPI compatibility.
FAQ
What is the maximum sampling rate supported by the MAX1270BENG+?
The MAX1270BENG+ achieves a maximum throughput rate of 110ksps in external clock mode with fSCLK = 2.0MHz and 18 clock cycles per conversion. This is specified for the 'B' grade variant under conditions of VDD = +5.0V ±5%, external reference = +4.096V, and TA = –40°C to +85°C. Internal clock mode yields lower effective rates due to fixed internal timing overhead.
Does the MAX1270BENG+ support bipolar and unipolar input configurations?
Yes, the MAX1270BENG+ supports both bipolar (±10V, ±5V) and unipolar (0 to +10V, 0 to +5V) input ranges. Configuration is performed per channel via the RNG and BIP bits in the 8-bit control byte. Bipolar mode outputs two's complement data; unipolar mode outputs straight binary - both formats are delivered MSB-first on DOUT.
How does the overvoltage protection work on the MAX1270BENG+ analog inputs?
The MAX1270BENG+ incorporates a resistor-network-based fault protection circuit on each CH0–CH7 input, limiting fault current to <2mA for voltages from –16.5V to +16.5V relative to AGND. This protection remains active even when the device is in FULLPD mode or VDD = 0, ensuring robustness against transient surges without affecting conversion accuracy on non-faulted channels.
Can the MAX1270BENG+ operate with an external reference voltage?
Yes, the MAX1270BENG+ supports external reference operation. To enable this mode, tie REFADJ to VDD to disable the internal reference buffer, then apply a stable 2.40V–4.18V reference voltage to the REF pin. Gain error is specified at ±3 LSB for unipolar and ±5 LSB for bipolar ranges under external reference conditions.
What are the power-down modes available on the MAX1270BENG+ and their typical currents?
The MAX1270BENG+ offers two software-programmable power-down modes: STBYPD (standby, 700–850µA) retains the reference buffer bias for fast wake-up, and FULLPD (full power-down, 120–220µA) disables all analog circuitry. Both are selected via PD1/PD0 bits in the control byte; SHDN pin provides hardware override to FULLPD regardless of software state.
MAX1270BENG+ 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:
- -
MAX1270BENG+ FAQ
1.How can I place an order for MAX1270BENG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1270BENG+ 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 MAX1270BENG+ reliable?
The price and inventory of MAX1270BENG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1270BENG+ is usually 5 days.
3.What payment methods are accepted for MAX1270BENG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1270BENG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1270BENG+?
MAX1270BENG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1270BENG+ 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 MAX1270BENG+?
For technical support, including MAX1270BENG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1270BENG+ requirements.
6.How does Aetrix verify that MAX1270BENG+ is sourced from the original manufacturer or authorized distributors?
All MAX1270BENG+ 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 MAX1270BENG+ meets industry standards.
7.What is the process for return or replacement of MAX1270BENG+?
All MAX1270BENG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1270BENG+, 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 MAX1270BENG+ part is unused and in its original packaging.
Return procedure for MAX1270BENG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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