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Analog Devices Inc./Maxim Integrated MAX1270BCNG
- Part No.:
- MAX1270BCNG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1270BCNG.pdf
- Description:
- IC ADC 12BIT SAR 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,056
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Product details
Overview
MAX1270BCNG from Maxim Integrated is a multirange, +5V single-supply, 8-channel, serial 12-bit analog-to-digital converter (ADC) with ±1 LSB integral nonlinearity, 110ksps throughput, and ±16.5V overvoltage-tolerant analog inputs. It supports four software-selectable input ranges (±10V, ±5V, 0 to +10V, 0 to +5V) and interfaces directly with SPI/QSPI/MICROWIRE controllers without level-shifting logic - ideal for industrial data-acquisition systems interfacing 4–20mA and ±12V sensors.
For engineers reviewing the MAX1270BCNG datasheet, MAX1270BCNG pinout, MAX1270BCNG application, or MAX1270BCNG equivalent, this page delivers verified technical context, validated pin functions, confirmed dynamic specifications (SINAD = 70dB, THD = –87dB), real-world application mappings, and two rigorously cross-checked alternative parts - all aligned to the MAX1270BCNG's 24-pin narrow PDIP package and B-grade accuracy (±1 LSB INL).
Technical Context
The MAX1270BCNG employs a successive-approximation register (SAR) architecture with integrated track/hold circuitry, operating at up to 110ksps using an external 2.0MHz clock or internal clock mode. Its analog front-end features a resistor-divider network enabling independent per-channel range selection and ±16.5V fault protection on all eight inputs - active even during power-down or VDD = 0.
Digital interface compliance includes SPI Mode 0 (CPOL = 0, CPHA = 0), MICROWIRE-compatible 3-wire timing, and programmable power-down modes (STBYPD and FULLPD). The device uses either its internal 4.096V reference (±15ppm/°C tempco) or an external reference applied to REF, with REFADJ supporting 2.5V-based external references via 1.638× gain buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR output with straight-binary (unipolar) or two's-complement (bipolar) coding - enables precise digital representation of sensor signals across multiple voltage domains. |
| INL / DNL | ±1 LSB integral nonlinearity and ±1 LSB differential nonlinearity - ensures monotonicity and ≤0.024% full-scale error in precision measurement applications. |
| Sampling Rate | 110ksps maximum throughput (MAX1270B grade) - supports real-time capture of 10kHz sine-wave inputs with 70dB SINAD and 80dB SFDR. |
| Input Voltage Ranges | Software-selectable per channel: ±10V, ±5V, 0 to +10V, 0 to +5V - eliminates external signal conditioning for legacy industrial sensors. |
| Overvoltage Tolerance | ±16.5V on CH0–CH7 relative to AGND - protects against transient faults without latch-up or performance degradation in harsh environments. |
| Reference Options | Internal 4.096V bandgap (±15ppm/°C) or external reference at REF - allows system-level calibration traceability or low-drift external references. |
| Power Supply | +5.0V ±5% single supply - simplifies power architecture versus dual-rail or ±15V ADCs while maintaining rail-to-rail input capability. |
Pinout & Package
MAX1270BCNG is housed in a 24-pin narrow plastic DIP (PDIP) package with 0.3-inch body width and through-hole mounting. Pin functions are electrically validated per Maxim's datasheet Rev 2 (19-4782), with no NC pins assigned to functional circuits.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | +5V supply input | Bypassed with 0.1µF capacitor to AGND; powers analog and digital sections - requires low-ESR ceramic decoupling for noise-sensitive conversions. |
| DGND (Pins 2, 4) | Digital ground reference | Separate return path for digital I/O (CS, SCLK, DIN, DOUT, SSTRB); must be tied to AGND at single point near REF bypass capacitor. |
| SCLK (Pin 5) | Serial clock input | Controls data shift-in/out timing; in external clock mode, also governs acquisition/conversion speed - accepts 0.1–2.0MHz square wave (50% duty cycle). |
| CS (Pin 6) | Active-low chip select | Enables serial interface; DOUT enters high-impedance state when CS is high - required for multi-device SPI bus sharing. |
| DIN (Pin 7) | Serial data input | Accepts 8-bit control byte (START, SEL2–SEL0, RNG, BIP, PD1, PD0) on rising SCLK edges - defines channel, range, polarity, and power mode per conversion. |
| SSTRB (Pin 8) | Serial strobe output | Indicates conversion status: pulses high for one SCLK period before MSB in external clock mode; goes low after control byte and returns high at completion in internal mode. |
| DOUT (Pin 10) | Serial data output | Outputs 12-bit result MSB-first on falling SCLK edges; tri-stated when CS is high - compatible with standard SPI MISO lines without external buffers. |
| SHDN (Pin 11) | Hardware shutdown input | Pull low to force FULLPD mode (120–220µA supply current); pull high for normal operation - provides fail-safe power control independent of software registers. |
| AGND (Pin 12) | Analog ground reference | Primary return for analog inputs, reference circuitry, and internal T/H - must be isolated from DGND except at single-point star connection. |
| CH0–CH7 (Pins 13–20) | Analog input channels | Eight independently programmable inputs with ±16.5V fault tolerance; each supports all four input ranges via software control - enables mixed-signal monitoring in one IC. |
| REFADJ (Pin 21) | Reference adjust output | Provides 2.500V ±0.035V buffered output; used to generate 4.096V at REF from 2.5V external reference - bypass with 0.01µF to AGND. |
| REF (Pin 23) | Reference buffer output / ADC reference input | Delivers 4.096V nominal internal reference; accepts external reference when REFADJ is pulled to VDD - determines full-scale voltage for all conversions. |
Key Features
| Feature | Design Value |
|---|---|
| Fault-protected analog multiplexer | ±16.5V tolerance on all eight channels - prevents damage or data corruption during sensor wiring errors or ESD events without external clamping diodes. |
| Software-configurable input ranges | Four per-channel ranges (±10V, ±5V, 0–10V, 0–5V) set via 8-bit control byte - eliminates hardware jumpers or external gain-switching circuitry. |
| Two power-down modes | STBYPD (700–850µA) retains reference buffer for fast wake-up; FULLPD (120–220µA) disables all circuitry - extends battery life in portable instrumentation. |
| SPI/QSPI/MICROWIRE compatibility | No external logic required; operates in Mode 0 (CPOL=0, CPHA=0) - integrates seamlessly with ARM Cortex-M, PIC, and MSP430 microcontrollers. |
| Internal 4.096V reference | ±15ppm/°C tempco, 4.076–4.116V output at +25°C - enables self-contained calibration without external voltage references in cost-sensitive designs. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Continuous acquisition of 4–20mA current-loop outputs from pressure, temperature, and flow transmitters in PLC-based control cabinets. IC Role / Device Role / Timing Role: 12-bit ADC digitizing eight analog sensor channels with ±10V range support and ±16.5V fault tolerance - acts as front-end signal conditioner and digitizer. Use Value: Eliminates need for external op-amp scaling and protection circuits, reducing BOM count by ≥4 components per channel while maintaining ±0.024% full-scale accuracy. |
Use Scenario: High-speed sampling of DUT analog outputs during functional testing, including DC offset, gain, and linearity verification. IC Role / Device Role / Timing Role: 110ksps serial ADC providing synchronized 12-bit samples to FPGA-based test sequencer - serves as metrology-grade measurement engine. Use Value: Achieves 70dB SINAD and 80dB SFDR at 10kHz input, enabling accurate characterization of amplifier THD and filter group delay without external FFT hardware. |
| Portable Data Loggers | Robotics Joint Sensing |
|
Use Scenario: Battery-powered field recorder capturing vibration, strain gauge, and thermocouple signals across remote infrastructure sites. IC Role / Device Role / Timing Role: Low-power ADC operating in STBYPD mode between acquisitions - manages energy budget while preserving reference stability for <10µs wake-up latency. Use Value: Reduces average supply current to <1mA at 1ksps sampling rate, extending AA-battery life to >12 months versus comparable 16-bit sigma-delta alternatives. |
Use Scenario: Real-time torque and position feedback acquisition from motor-mounted potentiometers and current-sense amplifiers in collaborative robot arms. IC Role / Device Role / Timing Role: Multichannel ADC synchronizing eight joint sensor readings with microsecond-level timestamp alignment - forms core of closed-loop motion controller input stage. Use Value: Enables simultaneous sampling across all axes with channel-to-channel gain matching ≤±0.3 LSB, critical for coordinated inverse-kinematics computation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multirange, serial 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7816U | Single-ended 12-bit SAR ADC; 100ksps max; no ±10V input support; requires external reference and level-shifting for 5V MCU interface. | Limited to unipolar 0–5V inputs; lacks fault protection and software-programmable ranges - suitable only for benign, low-voltage sensor interfaces. | Select when system already uses external 2.5V reference and only measures 0–5V signals; avoid for industrial ±10V or fault-prone environments. |
| MAX11607EEE+ | 8-channel, 12-bit SAR ADC; 94.5ksps; internal 2.048V reference; ±5V input range only; 16-pin QSOP package. | Fixed input range and lower sampling rate; smaller footprint but no ±10V or 0–10V support - targets space-constrained, lower-performance applications. | Choose for compact PCB layouts where ±10V range is unnecessary and 94.5ksps suffices; verify AGND/DGND separation meets MAX11607's stricter layout requirements. |
Compared with ADS7816U and MAX11607EEE+, the MAX1270BCNG uniquely delivers ±10V input capability, ±16.5V fault tolerance, and four software-selectable ranges in a single 24-pin PDIP - making it the only option among the three that eliminates external signal conditioning for legacy industrial sensors while maintaining 110ksps throughput and 12-bit precision.
Availability
MAX1270BCNG is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and portable data loggers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX1270BCNG 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 belongs to Maxim's precision data-acquisition product line, designed specifically for rugged, single-supply industrial systems needing multirange ADC functionality without external signal conditioning or protection circuitry.
FAQ
What is the maximum sampling rate supported by the MAX1270BCNG?
The MAX1270BCNG achieves a maximum throughput rate of 110ksps under external clock mode with a 2.0MHz SCLK frequency and 18-clock-per-conversion timing. This specification applies specifically to the MAX1270B grade (including MAX1270BCNG) and is validated across the full 0°C to +70°C operating temperature range. Internal clock mode reduces maximum rate to 43ksps due to fixed internal timing constraints.
Does the MAX1270BCNG require external components for basic operation?
Yes - the MAX1270BCNG requires at minimum a 0.1µF ceramic capacitor from VDD to AGND, a 4.7µF capacitor from REF to AGND, and a 0.01µF capacitor from REFADJ to AGND. These are mandatory for stable internal reference operation and noise suppression. Additional input filtering capacitors may be needed depending on source impedance and signal bandwidth requirements, as specified in the datasheet's acquisition time equations.
How does the MAX1270BCNG handle overvoltage conditions on its analog inputs?
The MAX1270BCNG incorporates a dedicated resistor network on each analog input (CH0–CH7) that limits fault current to <2mA during ±16.5V overvoltage events - regardless of channel selection state, power mode (STBYPD/FULLPD), or VDD presence. This protection remains fully active even when the device is unpowered, preventing latch-up and ensuring no impact on conversion results of other channels.
Can the MAX1270BCNG interface directly with a 3.3V microcontroller SPI port?
No - the MAX1270BCNG is a +5V-only device with digital I/O thresholds defined for 5V logic (VIH = 2.4V min, VIL = 0.8V max). Direct connection to a 3.3V MCU SPI port risks violating input high-level voltage requirements and may cause unreliable communication. A level-shifter IC or resistive divider network is required to translate 3.3V SCLK/CS/DIN signals to 5V-compatible levels for reliable MAX1270BCNG operation.
What is the accuracy specification for the MAX1270BCNG over temperature?
The MAX1270BCNG guarantees ±1 LSB integral nonlinearity (INL) over its full operating temperature range of 0°C to +70°C. Gain error is specified as ±10 LSB (bipolar) and ±5 LSB (unipolar) across temperature, while offset error reaches ±10 LSB in bipolar mode. All accuracy parameters are tested at VDD = +5.0V and referenced to the internal 4.096V bandgap or a 4.096V external reference.
MAX1270BCNG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 110k
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX1270BCNG FAQ
1.How can I place an order for MAX1270BCNG through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1270BCNG 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 MAX1270BCNG reliable?
The price and inventory of MAX1270BCNG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1270BCNG is usually 5 days.
3.What payment methods are accepted for MAX1270BCNG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1270BCNG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1270BCNG?
MAX1270BCNG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1270BCNG 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 MAX1270BCNG?
For technical support, including MAX1270BCNG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1270BCNG requirements.
6.How does Aetrix verify that MAX1270BCNG is sourced from the original manufacturer or authorized distributors?
All MAX1270BCNG 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 MAX1270BCNG meets industry standards.
7.What is the process for return or replacement of MAX1270BCNG?
All MAX1270BCNG units undergo pre-shipment inspection (PSI). If there is an issue with MAX1270BCNG, 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 MAX1270BCNG part is unused and in its original packaging.
Return procedure for MAX1270BCNG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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