My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1295ACEI
- Part No.:
- MAX1295ACEI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1295ACEI.pdf
- Description:
- IC ADC 12BIT SAR 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:796
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX1295ACEI from Maxim Integrated is a 12-bit, 265ksps successive-approximation ADC with integrated +2.5V reference, 6-channel single-ended / 3-channel pseudo-differential analog input multiplexer, and parallel 12-bit interface. It operates from a single +2.7V to +3.6V supply, consumes only 1.9mA at full speed, and features automatic power-down with 2µs wake-up-ideal for portable data-acquisition systems requiring precision, low power, and compact layout.
For engineers reviewing the MAX1295ACEI datasheet, MAX1295ACEI pinout, MAX1295ACEI application, or MAX1295ACEI equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in patient monitoring and energy management, and two validated alternative parts with documented functional and application differences.
Technical Context
The MAX1295ACEI implements a charge-redistribution SAR architecture with an internal 3MHz full-power bandwidth track/hold stage and software-configurable acquisition (internal or external). Its control byte (D7–D0) configures unipolar/bipolar mode, single-ended/pseudo-differential operation, channel selection (A2–A0), clock source (internal/external), and power-down state (PD1/PD0).
It supports dual reference modes: internal +2.5V bandgap (±20ppm/°C TC, ±0.5 LSB INL) or external reference via REF/REFADJ pins. The parallel interface uses active-low CS, WR, RD, and tri-stateable D0–D11 outputs with INT interrupt signaling conversion completion-no external timing logic required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes over temperature-ensures monotonicity in closed-loop control and sensor digitization. |
| Sampling Rate | 265ksps maximum-supports real-time capture of audio-band signals and fast transients in industrial I/O modules. |
| INL / DNL | ±0.5 LSB / ±1 LSB-guarantees <0.012% full-scale linearity error for high-fidelity measurement in energy metering. |
| Supply Current | 1.9mA at 265ksps, 400µA at 10ksps, 2µA in shutdown-enables battery life extension in handheld diagnostic devices. |
| Analog Input Range | 0V to +2.5V (unipolar) or −1.25V to +1.25V (bipolar)-matches standard sensor output ranges without external level-shifting. |
| Reference | +2.5V internal bandgap (±100mV adjust range via REFADJ)-eliminates need for external voltage reference IC in space-constrained designs. |
| Full-Power Bandwidth | 3MHz-allows undersampling of RF or switching noise components above Nyquist without aliasing degradation. |
Pinout & Package
MAX1295ACEI is housed in a 28-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for high-density PCB layouts in portable instrumentation and medical sensors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH5 | Analog input channels | 6 single-ended inputs (or 3 pseudo-differential pairs); CH0–CH5 enabled only in MAX1295ACEI-directly supports multi-sensor front-ends. |
| COM | Analog ground reference | Stable zero-code reference point; must remain within ±0.5 LSB during conversion-requires local 0.1µF bypass to GND. |
| REF / REFADJ | Reference buffer I/O | REF outputs +2.5V internal reference (4.7µF bypass); REFADJ adjusts reference or disables internal ref when tied to VDD. |
| CS, WR, RD | Parallel interface controls | Active-low chip select, write strobe, read strobe-enable direct connection to 8051/ARM GPIO without glue logic. |
| INT | Conversion status flag | Active-low open-drain interrupt; goes low when 12-bit result is ready on D0–D11-triggers µP ISR without polling overhead. |
| D0–D11 | Three-state data bus | Bidirectional 12-bit parallel I/O; tri-states when CS is high-allows shared bus operation with other peripherals. |
| VDD / GND | Power supply terminals | +2.7V to +3.6V analog supply; requires separate 0.1µF ceramic bypass per supply pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Selects 6-channel single-ended or 3-channel pseudo-differential mode via SGL/DIF bit-adapts to thermocouple, RTD, or bridge sensor configurations without hardware change. |
| Two power-down modes | Standby (10µA) and full shutdown (2µA)-reduces average current in intermittent-sampling applications like wireless sensor nodes. |
| Internal clock option | 3.6µs conversion time with no external clock required-simplifies BOM and layout for cost-sensitive embedded controllers. |
| Aperture jitter | 50ps typical (external acquisition mode)-preserves >70dB SINAD at 125kHz input frequency for high-resolution spectral analysis. |
| Input protection | Clamps analog inputs to GND−300mV / VDD+300mV-survives ESD and transient overvoltage in industrial fieldbus interfaces. |
Applications
| Industrial Control Systems | Data Logging |
|---|---|
Use Scenario: Monitoring temperature, pressure, and flow in PLC analog input modules with 4–20mA loop receivers. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned sensor outputs at 100ksps with bipolar input support for differential transducer signals. Use Value: ±0.5 LSB INL ensures <0.012% measurement accuracy across 0°C to +70°C operating range-meets IEC 61000-4-3 immunity requirements. |
Use Scenario: Battery-powered environmental sensor node recording temperature/humidity every 10 seconds for 1 year. IC Role / Device Role / Timing Role: Low-power ADC sampling thermistor and capacitive humidity sensor using software-triggered single conversions. Use Value: 2µA shutdown current extends CR2032 battery life beyond 12 months-enabled by automatic power-down between samples. |
| Patient Monitoring | Energy Management |
Use Scenario: Portable ECG front-end acquiring lead-II signal at 250ksps with anti-alias filtering. IC Role / Device Role / Timing Role: High-fidelity analog-to-digital converter capturing bio-potential waveforms with 3MHz full-power bandwidth. Use Value: 70dB SINAD and 80dB SFDR preserve QRS complex morphology-critical for arrhythmia detection algorithms. |
Use Scenario: Smart electricity meter measuring voltage/current phase angles and harmonic content up to 50th order. IC Role / Device Role / Timing Role: Precision ADC interfacing isolated sigma-delta modulator outputs via parallel bus for real-time RMS calculation. Use Value: 12-bit resolution with ±1 LSB DNL enables 0.1% energy billing accuracy compliant with IEC 62053-22 Class 0.2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit parallel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1294ACEI | +5V supply only (not +3V); identical pinout and feature set except higher supply voltage requirement. | Requires level-shifting or separate 5V rail-unsuitable for native 3.3V microcontroller systems. | Select MAX1294ACEI only when legacy 5V logic compatibility is mandatory and board space allows additional LDO. |
| ADS7822U | 8-pin MSOP, SPI interface (not parallel); 12-bit, 200ksps, 2.7–5.25V supply, no internal reference. | Needs external reference and SPI host controller-increases firmware complexity but reduces pin count and PCB area. | Choose ADS7822U for ultra-compact, low-pin-count designs where serial interface overhead is acceptable. |
Compared with MAX1294ACEI and ADS7822U, the MAX1295ACEI uniquely combines 3V operation, integrated reference, parallel interface, and 6-channel flexibility-making it optimal for space-constrained, low-power, multi-sensor data-acquisition systems without external timing or reference components.
Availability
MAX1295ACEI is available at Aetrix Electronics and suitable for industrial control systems, patient monitoring devices, and energy management equipment requiring stable component supply across extended production lifecycles.
Supply support for MAX1295ACEI 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 and mixed-signal ICs for demanding industrial, medical, and communications applications.
The MAX1295ACEI belongs to Maxim's low-power, high-accuracy data-acquisition ADC family-engineered specifically for battery-operated instruments and space-constrained embedded systems needing integrated reference and flexible input configuration.
FAQ
What is the operating temperature range for MAX1295ACEI?
The MAX1295ACEI is rated for 0°C to +70°C ambient operation, as confirmed by its ordering code suffix "CEI" and the Absolute Maximum Ratings table. This commercial-grade temperature range suits indoor industrial equipment, portable test gear, and consumer medical devices-not extended-temperature automotive or military applications.
Does MAX1295ACEI require an external clock to operate?
No, the MAX1295ACEI supports both internal and external clock modes. When configured for internal clock (D7=1, D6=0), it generates its own 3.6µs conversion timing-eliminating the need for an external oscillator. The CLK pin must be tied high or low in this mode to prevent floating.
How many analog input channels does MAX1295ACEI support in single-ended mode?
The MAX1295ACEI supports six analog input channels (CH0–CH5) in single-ended mode, as explicitly stated in the Features section and Pin Description table. This distinguishes it from the MAX1297 variant, which offers only two single-ended channels.
What is the purpose of the REFADJ pin on MAX1295ACEI?
The REFADJ pin on MAX1295ACEI serves two roles: (1) as an input to fine-tune the internal +2.5V reference voltage (±100mV range), and (2) as a disable control-when tied to VDD, it turns off the internal bandgap reference to allow use of an external reference applied to the REF pin.
Can MAX1295ACEI interface directly with a 3.3V microcontroller without level shifters?
Yes, MAX1295ACEI is fully compatible with 3.3V logic systems: its digital inputs accept VIH ≥ 2.0V and VIL ≤ 0.8V, and its three-state outputs drive VOH ≥ VDD−0.5V and VOL ≤ 0.4V under 1.6mA load-meeting standard 3.3V CMOS thresholds without translation circuitry.
MAX1295ACEI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 265k
- Number of Inputs:
- 3, 6
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- Parallel
- 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:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1295ACEI FAQ
1.How can I place an order for MAX1295ACEI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1295ACEI 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 MAX1295ACEI reliable?
The price and inventory of MAX1295ACEI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1295ACEI is usually 5 days.
3.What payment methods are accepted for MAX1295ACEI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1295ACEI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1295ACEI?
MAX1295ACEI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1295ACEI 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 MAX1295ACEI?
For technical support, including MAX1295ACEI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1295ACEI requirements.
6.How does Aetrix verify that MAX1295ACEI is sourced from the original manufacturer or authorized distributors?
All MAX1295ACEI 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 MAX1295ACEI meets industry standards.
7.What is the process for return or replacement of MAX1295ACEI?
All MAX1295ACEI units undergo pre-shipment inspection (PSI). If there is an issue with MAX1295ACEI, 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 MAX1295ACEI part is unused and in its original packaging.
Return procedure for MAX1295ACEI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1295ACEI 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…
