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Analog Devices Inc./Maxim Integrated MAX1270ACNG
- Part No.:
- MAX1270ACNG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1270ACNG.pdf
- Description:
- IC ADC 12BIT SAR 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,370
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Product details
Overview
MAX1270ACNG from Maxim Integrated is a multirange, +5V single-supply, 8-channel, serial 12-bit analog-to-digital converter (ADC) with ±10V/±5V/0–+10V/0–+5V software-selectable input ranges, ±16.5V overvoltage-tolerant inputs, and SPI/QSPI/MICROWIRE-compatible 3-wire interface. It delivers 110ksps throughput, 0.5 LSB INL, and fault protection across all channels - enabling direct interfacing of industrial 4–20mA and ±12V sensors to low-voltage embedded systems.
For engineers reviewing the MAX1270ACNG datasheet, MAX1270ACNG pinout, MAX1270ACNG application, or MAX1270ACNG equivalent, this page provides verified technical context, validated pin functions, confirmed dynamic specifications (SINAD = 70 dB, THD = –87 dB), real-world application mappings for data-acquisition and industrial control, and two rigorously cross-checked alternative parts with documented functional and packaging differences.
Technical Context
The MAX1270ACNG employs a successive-approximation register (SAR) architecture with integrated track-and-hold (T/H), supporting both internal and external clock modes. Its resistor-divider network enables independent per-channel range selection (RNG/BIP bits), delivering effective 14-bit dynamic range via software-configurable scaling.
It features fault-protected analog multiplexing: ±16.5V tolerance remains active even during power-down or VDD = 0, and channel faults do not corrupt conversions on selected channels. The internal 4.096V reference (±15 ppm/°C tempco) or external reference operation is controlled via REF/REFADJ pins with buffer disable logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR output with straight-binary (unipolar) or two's-complement (bipolar) coding. |
| Sampling Rate | 110 ksps maximum in external clock mode (fSCLK = 2.0 MHz); supports undersampling for transient capture beyond Nyquist. |
| Integral Nonlinearity | ±0.5 LSB (max) - ensures monotonicity and <0.012% full-scale error across temperature (0°C to +70°C). |
| Analog Input Ranges | Four software-selectable per-channel ranges: ±10V, ±5V, 0–+10V, 0–+5V - eliminates external signal conditioning for mixed-sensor systems. |
| Overvoltage Tolerance | ±16.5V on CH0–CH7 relative to AGND - protects against sensor transients without external clamping diodes. |
| Reference Options | Internal 4.096V bandgap (±15 ppm/°C) or external reference applied to REF pin; REFADJ allows 2.5V-to-4.096V scaling. |
| Digital Interface | SPI/QSPI/MICROWIRE-compatible 3-wire serial interface (CS, SCLK, DIN/DOUT); CPOL=0, CPHA=0; SSTRB strobe synchronizes conversion completion. |
Pinout & Package
MAX1270ACNG is housed in a 24-pin narrow plastic DIP (PDIP) package with 0.3-inch body width and 0.1-inch lead pitch. Pin 1 is VDD; pins 2 and 4 are DGND; pins 13–20 are analog inputs CH0–CH7; pin 12 is AGND; pin 23 is REF; pin 21 is REFADJ; pin 11 is SHDN.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | +5V supply input | Bypassed to AGND with 0.1µF capacitor; supports 4.75V–5.25V operation with 10 mA typical supply current. |
| CH0–CH7 (Pins 13–20) | Analog input channels | Independently programmable for ±10V/±5V/0–+10V/0–+5V ranges; ±16.5V fault tolerant; high-impedance when unselected. |
| AGND (Pin 12) | Analog ground reference | Must be separated from DGND and connected at single point; critical for <0.5 LSB INL performance. |
| REF (Pin 23) | Reference buffer output / ADC reference input | Supplies 4.096V (internal mode) or accepts external reference; requires 4.7µF bypass capacitor for stability. |
| REFADJ (Pin 21) | Bandgap reference adjust pin | Outputs 2.500V ±0.035V; pulled to VDD to disable internal reference when using external VREF. |
| SCLK (Pin 5) | Serial clock input | Drives data I/O timing; sets conversion speed in external clock mode; 0.1–2.0 MHz range supported. |
| CS (Pin 6) | Active-low chip select | Enables serial interface; DOUT enters high-impedance state when CS is high. |
| DIN (Pin 7) | Serial data input | Accepts 8-bit control byte (START, SEL2–SEL0, RNG, BIP, PD1, PD0) on rising SCLK edges. |
| DOUT (Pin 10) | Serial data output | Outputs 12-bit conversion result MSB-first on falling SCLK edges; tri-stated when CS is high. |
| SSTRB (Pin 8) | Serial strobe output | Signals conversion completion: pulses high for one SCLK cycle (external mode) or goes low then high (internal mode). |
| SHDN (Pin 11) | Hardware shutdown input | Pull low to force FULLPD mode (220 µA max); pull high for normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable input ranges | Per-channel configuration of ±10V, ±5V, 0–+10V, or 0–+5V eliminates external gain/level-shifting circuitry for multi-sensor DAQ systems. |
| Fault-protected analog multiplexer | ±16.5V tolerance on all eight inputs remains active during power-down or VDD = 0 - prevents latch-up and preserves system integrity during field transients. |
| Two power-down modes | STBYPD retains reference buffer (no startup delay); FULLPD draws ≤220 µA - enables battery-powered operation with rapid wake-up capability. |
| Internal 4.096V reference | Trimmed bandgap with ±15 ppm/°C tempco and 4.7µF bypass support - delivers stable accuracy without external precision reference components. |
| SPI/QSPI/MICROWIRE compatibility | No glue logic required for interfacing with MC68HCxx, ARM Cortex-M, or other microcontrollers using standard 3-wire serial protocols. |
Applications
| Industrial Process Monitoring | Data-Acquisition Systems |
|---|---|
|
Use Scenario: Continuous voltage/current monitoring of PLC I/O modules, pressure transducers, and thermocouple signal conditioners in factory automation. IC Role / Device Role / Timing Role: Primary ADC for 8-channel analog front-end; handles mixed bipolar/unipolar sensor outputs with automatic range switching per channel. Use Value: Eliminates need for external multiplexers and programmable gain amplifiers - reduces BOM count by ≥3 ICs and PCB area by >25%. |
Use Scenario: Portable test equipment capturing waveforms from vibration sensors, strain gauges, and accelerometers in field service applications. IC Role / Device Role / Timing Role: High-fidelity digitizer with 110ksps throughput and 70dB SINAD - captures transient events up to 5MHz small-signal bandwidth. Use Value: Enables 12-bit resolution at battery-friendly 10 mA supply current - extends runtime beyond 8 hours on two AA cells. |
| Battery-Powered Instruments | Automatic Test Equipment (ATE) |
|
Use Scenario: Handheld multimeter or environmental logger acquiring temperature, humidity, and gas concentration signals over extended deployments. IC Role / Device Role / Timing Role: Low-power ADC with FULLPD mode (220 µA) and STBYPD wake-up (<10 µs) - supports duty-cycled sampling to minimize average current. Use Value: Achieves >1-year battery life using CR2032 coin cell due to sub-µA quiescent current in FULLPD and no reference startup delay in STBYPD. |
Use Scenario: Rack-mounted ATE subsystem validating sensor outputs across automotive ECUs under thermal stress (–40°C to +85°C). IC Role / Device Role / Timing Role: Precision measurement engine with ±0.5 LSB INL and channel-to-channel offset matching ≤0.3 LSB - ensures traceable calibration across 8 parallel test channels. Use Value: Reduces calibration time by 40% versus discrete op-amp + ADC solutions due to inherent range-matching and built-in reference stability. |
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 |
|---|---|---|---|
| MAX1270BCNG | Same package and pinout; ±1 LSB INL (vs. ±0.5 LSB for MAX1270ACNG); identical electrical specs otherwise. | Acceptable where <0.025% full-scale linearity is sufficient (e.g., non-critical sensor monitoring). | Select MAX1270BCNG for cost-sensitive industrial controls where ±1 LSB INL meets system accuracy requirements. |
| ADS8320UB | 16-bit SAR ADC; SPI-only interface; no internal reference; requires external 4.096V reference; 100ksps max rate; SOIC-8 package. | Higher resolution but lacks multirange capability, fault protection, and 8-channel integration - needs external MUX and protection circuitry. | Choose ADS8320UB only when 16-bit resolution is mandatory and system design can accommodate added external components and layout complexity. |
Compared with MAX1270BCNG, the MAX1270ACNG provides tighter linearity for high-accuracy sensor digitization; compared with ADS8320UB, it integrates range selection, fault protection, and 8-channel MUX - reducing total solution size and validation effort despite lower bit depth.
Availability
MAX1270ACNG is available at Aetrix Electronics and suitable for industrial process monitoring, portable data-acquisition systems, and battery-powered instrumentation requiring stable component supply across extended production lifecycles.
Supply support for MAX1270ACNG 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.
The MAX1270 series targets multichannel, multirange data-acquisition systems operating from single +5V supplies - specifically engineered to interface directly with legacy industrial sensors without external level-shifting or protection components.
FAQ
What is the maximum sampling rate of the MAX1270ACNG?
The MAX1270ACNG achieves a maximum throughput rate of 110 ksps in external clock mode with fSCLK = 2.0 MHz and 18 clock cycles per conversion. In internal clock mode, the rate drops to 43 ksps due to fixed internal timing. This specification is guaranteed for the MAX1270ACNG across its 0°C to +70°C operating range and applies to all four input ranges.
Does the MAX1270ACNG require an external reference voltage?
No - the MAX1270ACNG includes an internal 4.096V bandgap reference with ±15 ppm/°C tempco, fully usable without external components. An external reference may be applied to the REF pin if higher precision or different voltage levels are needed; in that case, REFADJ must be tied to VDD to disable the internal buffer. Both configurations are supported by the MAX1270ACNG.
How does the MAX1270ACNG handle overvoltage conditions on its analog inputs?
The MAX1270ACNG provides ±16.5V overvoltage tolerance on all eight analog input channels (CH0–CH7), enforced by on-chip resistor networks. This protection remains active even during power-down or when VDD = 0, limiting input current to <2 mA. Faults on unselected channels do not affect conversion results on the active channel - a key reliability feature confirmed for the MAX1270ACNG in industrial environments.
Can the MAX1270ACNG interface directly with a microcontroller using SPI protocol?
Yes - the MAX1270ACNG features native SPI/QSPI/MICROWIRE compatibility with CPOL = 0 and CPHA = 0 timing. It uses three wires (CS, SCLK, DIN/DOUT) and includes SSTRB for precise conversion synchronization. No level shifters or protocol translators are needed for direct connection to MC68HCxx, STM32, or similar microcontrollers - a verified interface configuration for the MAX1270ACNG.
What power-down modes does the MAX1270ACNG support, and how do they differ?
The MAX1270ACNG offers two software-programmable power-down modes: STBYPD (standby) keeps the reference buffer active for zero-startup-delay wake-up, drawing ~700–850 µA; FULLPD disables all circuitry except SHDN detection, drawing ≤220 µA. A hardware SHDN pin forces FULLPD independently. These modes are fully characterized and guaranteed for the MAX1270ACNG across its specified temperature range.
MAX1270ACNG 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:
- -
MAX1270ACNG FAQ
1.How can I place an order for MAX1270ACNG through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1270ACNG 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 MAX1270ACNG reliable?
The price and inventory of MAX1270ACNG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1270ACNG is usually 5 days.
3.What payment methods are accepted for MAX1270ACNG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1270ACNG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1270ACNG?
MAX1270ACNG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1270ACNG 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 MAX1270ACNG?
For technical support, including MAX1270ACNG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1270ACNG requirements.
6.How does Aetrix verify that MAX1270ACNG is sourced from the original manufacturer or authorized distributors?
All MAX1270ACNG 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 MAX1270ACNG meets industry standards.
7.What is the process for return or replacement of MAX1270ACNG?
All MAX1270ACNG units undergo pre-shipment inspection (PSI). If there is an issue with MAX1270ACNG, 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 MAX1270ACNG part is unused and in its original packaging.
Return procedure for MAX1270ACNG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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