My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1240ACPA+
- Part No.:
- MAX1240ACPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1240ACPA+.pdf
- Description:
- IC ADC 12BIT SERIAL 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,971
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX1240ACPA+ from Maxim Integrated is a low-power, 12-bit successive-approximation analog-to-digital converter (ADC) in an 8-pin PDIP package, operating from +2.7V to +3.6V with internal 2.5V reference, 73ksps throughput, ±0.5 LSB INL, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - used for precision data acquisition in battery-powered instrumentation.
For engineers reviewing the MAX1240ACPA+ datasheet, MAX1240ACPA+ pinout, MAX1240ACPA+ application, or MAX1240ACPA+ equivalent, this page delivers verified electrical specs, validated pin functions, confirmed thermal and dynamic performance across 0°C to +70°C, and real-world substitution guidance for space-constrained, low-power sensor interfaces.
Technical Context
The MAX1240ACPA+ integrates a track/hold amplifier with 1.5µs acquisition time and a 12-bit SAR ADC core, using an internal trimmed 2.5V reference that sources up to 400µA and requires a 4.7µF bypass capacitor at REF. Its unipolar transfer function maps 0V–2.5V input to 0x000–0xFFF output codes with no missing codes over temperature.
Conversion is initiated by CS falling edge; DOUT signals end-of-conversion (EOC) with a rising edge, then shifts out MSB-first serial data on SCLK falling edges - compatible with SPI (CPOL=0, CPHA=0), QSPI, and MICROWIRE protocols without external clock dependency during conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output levels for high-fidelity signal digitization |
| INL (Integral Nonlinearity) | ±0.5 LSB - ensures monotonicity and <0.012% full-scale error for calibrated measurement systems |
| Throughput Rate | 73 ksps - supports real-time sampling of audio-band and control-loop signals |
| Supply Voltage Range | +2.7V to +3.6V - enables direct operation from single Li-ion or 3.3V rail without regulation |
| Reference | Internal 2.5V ±30 ppm/°C - eliminates external reference component and reduces BOM count |
| Power Consumption | 3.7 µW at 73 ksps - achieves ultra-low energy per sample for extended battery life |
| SINAD | 70 dB - provides >11.3 effective bits for noise-sensitive transducer interfacing |
Pinout & Package
MAX1240ACPA+ uses an 8-pin plastic dual in-line package (PDIP) with 0.3-inch width and through-hole mounting. Pin spacing is 0.1 inch; body dimensions are 0.390 × 0.245 inches.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +3.6V; powers analog and digital sections; bypass with 0.1µF + 4.7µF capacitors |
| AIN (Pin 2) | Analog input | 0V to VREF (2.5V) unipolar range; input impedance 9kΩ; protected to GND −0.3V / VDD +0.3V |
| SHDN (Pin 3) | Three-level shutdown control | Pull low for <15µA shutdown; leave open to disable internal reference and use external VREF |
| REF (Pin 4) | Reference voltage node | 2.5V output (MAX1240 only); requires 4.7µF capacitor for stability; can source 400µA |
| GND (Pin 5) | Analog/digital ground | Single-point star ground connection required; separates analog and digital return paths |
| CS (Pin 6) | Active-low chip select | Falling edge initiates conversion; high state places DOUT in high-impedance mode |
| DOUT (Pin 7) | Serial data output | MSB-first unipolar format; EOC signaled by rising edge; transitions on SCLK falling edge |
| SCLK (Pin 8) | Serial clock input | Accepts up to 2.1MHz clock; duty cycle unrestricted if each phase ≥200ns; not required during conversion |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference | Trimmed ±0.5 LSB gain error; ±30 ppm/°C drift; eliminates need for external reference IC or resistor divider |
| Low-power shutdown mode | Reduces supply current to ≤15µA; wake-up delay depends on REF capacitor discharge time |
| Track/hold acquisition time | 1.5µs maximum - enables accurate sampling of fast-rising sensor outputs without external hold capacitor |
| 3-wire serial interface | Compatible with SPI/QSPI/MICROWIRE; requires only CS, SCLK, DOUT - saves MCU GPIO and simplifies PCB routing |
| Small-footprint PDIP package | 8-pin through-hole form factor - supports prototyping, legacy board upgrades, and manual assembly |
Applications
| Battery-Powered Data Loggers | Portable Medical Sensors |
|---|---|
Use Scenario: Continuous voltage monitoring of thermistor, strain gauge, or pH electrode outputs in handheld diagnostic tools. IC Role / Device Role / Timing Role: Primary ADC digitizing analog biosensor signals at 1–10 ksps with minimal self-heating and supply ripple sensitivity. Use Value: 12-bit resolution and 70 dB SINAD enable sub-millivolt detection; internal reference removes calibration drift from external components. |
Use Scenario: Signal conditioning in wearable ECG front-ends where size, power, and noise immunity are critical. IC Role / Device Role / Timing Role: Low-noise, low-power ADC capturing biopotential waveforms with precise timing alignment via CS-triggered conversions. Use Value: 1.5µs track/hold acquisition captures rapid R-wave onset; 3.7µW active power extends device runtime beyond 72 hours on coin cell. |
| Industrial Process Transmitters | Isolated Sensor Interfaces |
Use Scenario: 4–20mA loop-powered field instruments measuring pressure, flow, or temperature in factory automation. IC Role / Device Role / Timing Role: High-accuracy ADC converting conditioned sensor output under tight power budget (<1mW total system). Use Value: ±0.5 LSB INL meets Class A transmitter linearity requirements; internal reference avoids drift-induced zero-shift over temperature. |
Use Scenario: Digitizing isolated analog signals across optocoupler or transformer barriers in safety-critical monitoring systems. IC Role / Device Role / Timing Role: Isolation-side ADC receiving analog inputs via precision resistive dividers with galvanic separation. Use Value: 2.5V internal reference provides stable scaling independent of primary-side supply variations; 8-pin PDIP eases creepage/clearance layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit, 200ksps, +2.7V to +5.5V supply, external reference only, no internal REF, 6-pin SOT-23 package | Higher speed but requires external reference and lacks internal 2.5V REF; unsuitable where reference integration is mandatory | Select when higher throughput is needed and board space is constrained - not drop-in due to different pinout and missing internal reference |
| MAX11100EUA+ | 12-bit, 100ksps, +2.7V to +3.6V, internal 2.048V reference, 8-pin µMAX package, SPI-only interface | Lower reference voltage (2.048V) reduces full-scale range; µMAX package incompatible with PDIP footprints | Choose for improved noise performance (72 dB SINAD) and smaller footprint - requires PCB redesign and reference scaling adjustment |
Compared with ADS7822U and MAX11100EUA+, the MAX1240ACPA+ uniquely combines internal 2.5V reference, PDIP package, and guaranteed ±0.5 LSB INL at 73ksps - making it optimal for legacy-compatible, low-drift, through-hole data acquisition designs where reference integration and mechanical fit are non-negotiable.
Availability
MAX1240ACPA+ is available at Aetrix Electronics and suitable for battery-powered systems, portable data logging, and isolated data acquisition requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX1240ACPA+ 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 demanding industrial, medical, and communications applications.
The MAX1240 series targets low-power, high-accuracy data acquisition in space- and energy-constrained environments - emphasizing integrated references, small packages, and robust serial interfaces for sensor front-ends.
FAQ
What is the operating temperature range for the MAX1240ACPA+?
The MAX1240ACPA+ is specified for 0°C to +70°C ambient operation. This commercial-grade temperature range is validated across all DC accuracy parameters including offset error, gain error, and INL - ensuring reliable performance in indoor instrumentation and portable electronics where thermal management is passive.
Does the MAX1240ACPA+ require an external reference?
No, the MAX1240ACPA+ includes a factory-trimmed 2.5V internal reference with ±30 ppm/°C temperature coefficient and 400µA output capability. It requires only a 4.7µF capacitor at the REF pin for stability. An external reference may be used only if SHDN is left floating to disable the internal reference.
What is the maximum sampling rate of the MAX1240ACPA+?
The MAX1240ACPA+ achieves a maximum throughput rate of 73 ksps at full 12-bit resolution. This is enabled by its 7.5µs conversion time and 1.5µs track/hold acquisition - allowing real-time capture of signals up to ~36.5 kHz under Nyquist criteria.
How does the shutdown mode work on the MAX1240ACPA+?
Pulling SHDN low reduces MAX1240ACPA+ supply current to ≤15µA. Wake-up time depends on REF capacitor discharge: after short shutdown, wake-up is near-instant; after long shutdown, up to 20ms may be needed for the 4.7µF capacitor to recharge to full accuracy. SHDN high or open enables normal operation.
Is the MAX1240ACPA+ compatible with standard microcontroller serial interfaces?
Yes, the MAX1240ACPA+ supports SPI, QSPI, and MICROWIRE protocols with CPOL=0 and CPHA=0. It uses CS, SCLK, and DOUT lines only - no MISO/MOSI complexity - and shifts data MSB-first on SCLK falling edges, enabling direct connection to most 8-/16-bit MCUs without level-shifting or protocol translation.
MAX1240ACPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 73k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX1240ACPA+ FAQ
1.How can I place an order for MAX1240ACPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1240ACPA+ 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 MAX1240ACPA+ reliable?
The price and inventory of MAX1240ACPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1240ACPA+ is usually 5 days.
3.What payment methods are accepted for MAX1240ACPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1240ACPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1240ACPA+?
MAX1240ACPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1240ACPA+ 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 MAX1240ACPA+?
For technical support, including MAX1240ACPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1240ACPA+ requirements.
6.How does Aetrix verify that MAX1240ACPA+ is sourced from the original manufacturer or authorized distributors?
All MAX1240ACPA+ 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 MAX1240ACPA+ meets industry standards.
7.What is the process for return or replacement of MAX1240ACPA+?
All MAX1240ACPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1240ACPA+, 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 MAX1240ACPA+ part is unused and in its original packaging.
Return procedure for MAX1240ACPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1240ACPA+ 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…
