My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1265ACEI+
- Part No.:
- MAX1265ACEI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1265ACEI+.pdf
- Description:
- IC ADC 12BIT 265KSPS 28-QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,448
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX1265ACEI+ from Maxim Integrated is a low-power, 12-bit successive-approximation ADC with internal +2.5V reference, 265ksps sampling rate, 6-channel single-ended / 3-channel pseudo-differential analog input multiplexer, and parallel 12-bit interface - designed for battery-powered data acquisition in industrial control and patient monitoring systems.
For engineers reviewing the MAX1265ACEI+ datasheet, MAX1265ACEI+ pinout, MAX1265ACEI+ application, or MAX1265ACEI+ equivalent, this page delivers verified electrical specs, validated package mapping (28-pin QSOP), confirmed timing behavior (3.3µs conversion time, 2µs wake-up), and real-world interface constraints including CS/WR/RD handshaking and INT-driven read synchronization.
Technical Context
The MAX1265ACEI+ implements a charge-redistribution SAR architecture with integrated track/hold (3MHz full-power bandwidth, 250kHz full-linear bandwidth) and software-configurable acquisition modes (internal or external). Its analog front-end supports unipolar/bipolar operation and channel selection via 3-bit address (A2–A0) in the 8-bit control byte.
Digital control is executed through an 8-bit write-only configuration port (D7–D0) that sets SGL/DIF, UNI/BIP, ACQMOD, and PD1/PD0 bits; conversion results are read via a 12-bit tri-state parallel bus (D11–D0) synchronized by RD and flagged by active-low INT. Clocking supports both internal (4.8MHz nominal) and external (100kHz–4.8MHz) modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes over temperature |
| Sampling Rate | 265ksps maximum - enables real-time capture of signals up to 125kHz (Nyquist-limited) or higher via undersampling |
| INL / DNL | ±0.5 LSB / ±1 LSB - ensures monotonicity and <0.012% full-scale linearity error for precision sensor digitization |
| Supply Current | 1.9mA at 265ksps (internal reference); drops to 2µA in power-down mode - critical for ultra-low-power portable designs |
| Reference | +2.5V internal bandgap (±0.5% initial accuracy, ±20ppm/°C TC) - eliminates external reference component and layout area |
| Analog Input Range | Single-ended: 0V to VREF; bipolar: –VREF/2 to +VREF/2 - supports both ground-referenced and differential-signal measurement topologies |
| Package | 28-pin QSOP (300 mil width), 0°C to +70°C operating range - compatible with standard surface-mount assembly and industrial ambient conditions |
Pinout & Package
MAX1265ACEI+ is housed in a 28-pin QSOP package (300-mil body width) with exposed pad not electrically connected. Pin functions are validated per Maxim's official pin description table and functional diagram (Rev 0, April 2003).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH5 | Analog input channels | 6 single-ended inputs; CH0–CH5 form three pseudo-differential pairs (CH0/CH1, CH2/CH3, CH4/CH5) |
| COM | Analog common reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB during conversion |
| REF / REFADJ | Reference buffer I/O | REF outputs +2.5V internal reference (bypass with 4.7µF); REFADJ disables internal ref when tied to VDD |
| VDD / GND | Analog power supply | +2.7V to +3.6V single supply; separate analog/digital ground pins not used - shared GND required |
| CS / WR / RD | Digital control strobes | Active-low chip select, write latch, and read enable - define 8-bit config write and 12-bit data read cycles |
| INT | Conversion complete flag | Active-low open-drain output; asserts when result is valid and deasserts on first RD pulse or new WR |
| D0–D11 | Tri-state parallel data bus | Configured as input (D7–D0) for control byte; output (D11–D0) for conversion result in unipolar (binary) or bipolar (two's complement) format |
| CLK | Clock input | Accepts external TTL/CMOS clock (100kHz–4.8MHz); tied high/low in internal clock mode |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Selects single-ended (6 channels) or pseudo-differential (3 pairs) via SGL/DIF bit - enables flexible sensor interfacing without hardware change |
| Two power-down modes | Standby (10µA) and full shutdown (2µA) - reduces average current in burst-sampling applications like data loggers |
| Fast wake-up | 2µs exit from power-down to valid conversion - supports rapid response to event-triggered sampling |
| Internal track/hold | 3MHz full-power bandwidth with 3.3µs conversion time - captures transients without external THS circuitry |
| Parallel 12-bit interface | Direct connection to 16-bit µP data bus using CS/WR/RD handshaking - eliminates serial-to-parallel conversion overhead |
| On-chip +2.5V reference | ±0.5% initial accuracy, ±20ppm/°C drift - removes need for external reference and associated decoupling components |
Applications
| Industrial Control Systems | Data Logging |
|---|---|
Use Scenario: Monitoring temperature, pressure, and flow sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Primary ADC digitizing 4–20mA loop signals and thermocouple outputs with 12-bit resolution and bipolar support. Use Value: Internal +2.5V reference and 6-channel MUX reduce BOM count and PCB area; 265ksps rate supports multi-sensor polling within control cycle deadlines. |
Use Scenario: Battery-powered environmental sensor nodes recording temperature, humidity, and light intensity over days. IC Role / Device Role / Timing Role: Low-power ADC acquiring samples at 10–100Hz with automatic power-down between conversions. Use Value: 2µA shutdown current extends battery life; software-selectable unipolar mode matches sensor output range without level-shifting circuitry. |
| Patient Monitoring | Energy Management |
Use Scenario: Portable ECG and pulse oximetry devices requiring compact, low-noise analog front-end. IC Role / Device Role / Timing Role: Digitizing conditioned biopotential signals with pseudo-differential inputs to reject common-mode noise. Use Value: 3-channel pseudo-differential mode (CH0/CH1, CH2/CH3, CH4/CH5) enables simultaneous lead measurements; 67dB SINAD meets clinical signal fidelity requirements. |
Use Scenario: Smart metering subsystems measuring voltage, current, and power factor in residential energy monitors. IC Role / Device Role / Timing Role: High-speed ADC capturing AC waveforms at ≥250ksps for RMS and harmonic analysis. Use Value: 250kHz full-linear bandwidth supports accurate 50/60Hz fundamental and harmonic measurement; internal T/H eliminates external sample-hold dependency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1266ACEI+ | +5V supply only; identical pinout, 12-bit resolution, 265ksps, but requires external reference and lacks internal +2.5V ref | Used where system already provides stable +5V rail and external reference; not suitable for +3V-only designs | Select when migrating legacy +5V systems and external reference infrastructure exists |
| ADS7822U | 2.7V–5.25V supply; SPI interface (not parallel); 12-bit, 200ksps; no internal reference - requires external REF and REFADJ handling | Fits space-constrained designs needing serial interface; incompatible with parallel µP buses without glue logic | Choose for low-pin-count microcontrollers with SPI and where board area is more critical than interface speed |
Compared with MAX1265ACEI+, MAX1266ACEI+ offers pin compatibility but mandates +5V operation and external reference, while ADS7822U trades parallel speed and internal reference for serial interface flexibility and wider supply range - neither is drop-in replaceable without schematic or firmware changes.
Availability
MAX1265ACEI+ is available at Aetrix Electronics and suitable for industrial control systems, portable medical devices, and battery-powered data loggers requiring stable component supply across extended production lifecycles.
Supply support for MAX1265ACEI+ 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, medical, and communications applications.
The MAX1265ACEI+ belongs to Maxim's precision data-acquisition ADC family, engineered for low-power, high-accuracy digitization in space- and energy-constrained embedded systems with minimal external component count.
FAQ
What is the operating temperature range for MAX1265ACEI+?
The MAX1265ACEI+ is specified for 0°C to +70°C operation, as indicated by the 'C' grade suffix in its ordering code. This commercial-grade temperature range aligns with applications such as industrial HMI panels, portable test equipment, and non-automotive embedded systems where ambient conditions remain within controlled environments. The device's internal reference exhibits ±20ppm/°C drift across this range, supporting stable performance without calibration.
Does MAX1265ACEI+ require an external clock to operate?
No, MAX1265ACEI+ supports both internal and external clock modes. When configured for internal clock mode (D7=1, D6=0 in control byte), it generates its own ~4.8MHz conversion clock - eliminating the need for an external oscillator. In this mode, the CLK pin must be tied high or low to prevent floating. External clock mode (D7=D6=1) accepts 100kHz–4.8MHz TTL/CMOS signals for precise timing control in synchronized systems.
How many analog input channels does MAX1265ACEI+ support in single-ended mode?
The MAX1265ACEI+ supports six analog input channels (CH0–CH5) in single-ended mode, as confirmed by the device's pin configuration, functional diagram, and channel selection tables. This is distinct from the MAX1267 variant (2-channel), and the 'A' grade ordering suffix does not affect channel count. Channel selection is performed via the A2–A0 bits in the 8-bit control byte written to D7–D0.
Can MAX1265ACEI+ interface directly with a 16-bit microprocessor data bus?
Yes, MAX1265ACEI+ features a 12-bit tri-state parallel interface (D11–D0) with standard CS/WR/RD control signals, enabling direct connection to 16-bit µP data buses without level shifters or glue logic. The device outputs unipolar data in straight binary and bipolar data in two's complement format - both natively compatible with common 16-bit processor I/O addressing schemes and interrupt-driven read sequences using the INT signal.
What is the minimum acquisition time required before conversion starts in MAX1265ACEI+?
The MAX1265ACEI+ specifies a maximum track/hold acquisition time (tACQ) of 625ns under typical conditions. This value is fixed by internal design and independent of external source impedance when driving from ≤3kΩ sources. For higher-impedance sensors, acquisition time increases per tACQ = 9(RS + 800Ω) × 12pF, requiring external RC filtering or longer inter-conversion delays to maintain accuracy - a constraint explicitly documented in the datasheet's "Track/Hold" section.
MAX1265ACEI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- -
MAX1265ACEI+ FAQ
1.How can I place an order for MAX1265ACEI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1265ACEI+ 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 MAX1265ACEI+ reliable?
The price and inventory of MAX1265ACEI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1265ACEI+ is usually 5 days.
3.What payment methods are accepted for MAX1265ACEI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1265ACEI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1265ACEI+?
MAX1265ACEI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1265ACEI+ 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 MAX1265ACEI+?
For technical support, including MAX1265ACEI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1265ACEI+ requirements.
6.How does Aetrix verify that MAX1265ACEI+ is sourced from the original manufacturer or authorized distributors?
All MAX1265ACEI+ 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 MAX1265ACEI+ meets industry standards.
7.What is the process for return or replacement of MAX1265ACEI+?
All MAX1265ACEI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1265ACEI+, 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 MAX1265ACEI+ part is unused and in its original packaging.
Return procedure for MAX1265ACEI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1265ACEI+ 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…
