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Analog Devices Inc./Maxim Integrated MAX1065BEUI+
- Part No.:
- MAX1065BEUI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX1065BEUI+.pdf
- Description:
- IC ADC 14BIT SAR 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,162
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Product details
Overview
MAX1065BEUI+ from Maxim Integrated is a 14-bit, low-power successive-approximation ADC with parallel interface, internal 4.096V reference, ±2 LSB INL (max), 165 ksps sample rate, and operation over –40°C to +85°C. It serves as the primary analog-to-digital conversion stage in high-precision, battery-powered data-acquisition systems requiring minimal power and compact layout.
For engineers reviewing the MAX1065BEUI+ datasheet, MAX1065BEUI+ pinout, MAX1065BEUI+ application, or MAX1065BEUI+ equivalent, this page delivers verified technical context, real-world timing behavior, supply current vs. sample rate trade-offs, and validated alternatives for industrial sensor interfaces and embedded measurement circuits.
Technical Context
The MAX1065BEUI+ implements a SAR architecture with integrated track-and-hold, factory-trimmed 4.096V internal reference (±35 ppm/°C), and automatic power-down controlled via R/C pin sequencing. Its 14-bit-wide parallel output (D0–D13) supports direct µP bus interfacing without external latching.
Conversion is initiated by CS falling edges with R/C state determining post-conversion mode: standby (reference active, <1 mA) or shutdown (reference off, 0.5 µA typ). Acquisition time is 1.1 µs min, conversion time is 4.7 µs max, and aperture jitter is 100 ps - enabling undersampling of signals up to 4 MHz bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 distinct digital codes across full-scale input range |
| Sample Rate | 165 ksps - supports real-time capture of signals up to ~20 kHz full-linear bandwidth |
| INL (max) | ±2 LSB - ensures monotonicity and ≤0.012% full-scale linearity error at extended temperature |
| Supply Current (165 ksps, ext ref) | 1.8 mA total (IAVDD + IDVDD) - enables >500-hour operation on a 1000 mAh Li-ion cell |
| Reference Voltage | 4.096 V (internal, ±35 ppm/°C) - matches standard 16-bit DAC scaling and simplifies calibration |
| Aperture Jitter | 100 ps - limits SNR degradation to ≤0.3 dB at 100 kHz input, preserving 82 dB typical SNR |
| Digital Supply Range | 2.7 V to 5.25 V - allows interoperability with 3.3 V and 5 V logic families without level shifters |
Pinout & Package
MAX1065BEUI+ is housed in a 28-pin TSSOP (4.4 mm × 9.7 mm, 0.65 mm pitch) with exposed pad for thermal enhancement. All pins are surface-mount compatible and require standard reflow profiles per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D13 | Three-state parallel digital output | 14-bit wide bus; D13 = MSB; high-impedance during acquisition/conversion; driven after third CS fall with R/C high |
| CS | Convert Start control input | Edge-triggered: first fall powers up, second fall starts conversion, third fall loads data onto bus |
| R/C | Read/Convert mode select | Configures post-conversion state: low = standby (ref on), high = shutdown (ref off); controls HBEN function on MAX1066 only |
| EOC | End-of-Conversion flag | Active-low open-drain output; falls when conversion completes; used to synchronize µP read cycle |
| AIN | Analog input | Single-ended input referenced to AGND; 40 pF input capacitance; supports 0 V to VREF range |
| REF / REFADJ | Reference I/O pair | REF outputs 4.096 V (internal) or accepts 3.8–5.25 V external ref; REFADJ adjusts internal ref or disables buffer when tied to AVDD |
| AVDD / DVDD | Analog & digital supplies | AVDD: 4.75–5.25 V (bypass 0.1 µF + 1 µF); DVDD: 2.7–5.25 V (bypass 0.1 µF); AGND/DGND must be separated and joined at single point |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ mode | Reduces total supply current to 0.1 mA at 10 ksps with external reference - extends battery life in intermittent-sampling applications |
| Factory-trimmed internal reference | 4.096 V ±0.4% (±16 mV) over –40°C to +85°C - eliminates need for external precision reference in cost-sensitive designs |
| High-speed parallel interface | 14-bit-wide bus with 40 ns CS-to-data-valid timing (DVDD ≥ 4.75 V) - enables direct connection to 8051, ARM Cortex-M, or FPGA I/O without glue logic |
| Low-noise SAR architecture | 82 dB typical SNR and 87 dB SFDR at 1 kHz - meets requirements for vibration monitoring and precision sensor digitization |
| Flexible power management | Three operational states: full power (1.8 mA), standby (<1 mA), shutdown (0.5 µA) - selectable per conversion cycle via R/C pin |
Applications
| Industrial Sensor Interface | Portable Data Logger |
|---|---|
|
Use Scenario: Digitizing thermocouple, RTD, or strain gauge outputs in PLC I/O modules with isolated analog front-ends. IC Role / Device Role / Timing Role: Primary ADC converting conditioned analog signals to 14-bit digital words synchronized to µP polling via EOC and CS. Use Value: ±2 LSB INL and 82 dB SNR ensure <0.02% measurement uncertainty across –40°C to +85°C; AutoShutdown cuts idle current by 94% vs. continuous operation. |
Use Scenario: Battery-powered environmental monitor logging temperature, humidity, and pressure every 10 seconds. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated on timer interrupt; samples once per interval then enters shutdown until next trigger. Use Value: 0.1 mA shutdown current enables multi-year operation on AA cells; internal reference eliminates BOM cost and board space for external ref IC. |
| Motor Control Feedback | Test & Measurement Equipment |
|
Use Scenario: Capturing current-sense amplifier outputs in servo drives for real-time torque estimation and overcurrent protection. IC Role / Device Role / Timing Role: High-speed sampling node feeding FPGA-based observer algorithms; triggered by PWM sync signal via CS. Use Value: 165 ksps rate supports 10 kHz current loop bandwidth; 100 ps aperture jitter maintains phase accuracy in closed-loop control. |
Use Scenario: Embedded digitizer channel in handheld cable tester verifying continuity, shorts, and impedance mismatches. IC Role / Device Role / Timing Role: Precision ADC capturing step-response waveforms from TDR stimulus; uses internal clock to eliminate external timing components. Use Value: 4 MHz small-signal input bandwidth enables accurate rise-time measurement; ±1 LSB DNL guarantees no missing codes in pass/fail threshold detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8325IPW | 16-bit resolution, SPI interface, no internal reference, 100 ksps max, 20-pin TSSOP | Requires external reference and serial interface logic; better resolution but lower speed and higher software overhead | Select when absolute accuracy >16 bits is required and µP has SPI resources; avoid if parallel bus or 165 ksps is mandatory |
| AD7940BRMZ | 14-bit, SPI interface, internal 2.5 V ref, 100 ksps, 10-pin MSOP, 1.25 mW @ 100 ksps | Lower power and smaller package but serial-only interface and fixed 2.5 V reference incompatible with 4.096 V scaling | Select for ultra-compact, low-power designs where SPI is preferred and reference voltage flexibility is not needed |
Compared with MAX1065BEUI+, ADS8325IPW offers higher resolution but sacrifices speed and parallel simplicity, while AD7940BRMZ reduces size and power at the cost of interface compatibility and reference scalability - making MAX1065BEUI+ optimal for µP-native, medium-speed, 4.096 V-referenced systems.
Availability
MAX1065BEUI+ is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable data loggers, motor control feedback loops, and test & measurement equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1065BEUI+ 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 MAX1065BEUI+ belongs to Maxim's low-power, high-accuracy SAR ADC product line - engineered specifically for battery-operated and space-constrained data-acquisition systems needing guaranteed performance from –40°C to +85°C.
FAQ
What is the maximum operating temperature range for the MAX1065BEUI+?
The MAX1065BEUI+ is rated for operation from –40°C to +85°C, as confirmed by its "E" grade suffix and ordering table specification. This extended temperature range is validated across all electrical parameters including INL (±2 LSB max), supply current, and reference stability - making MAX1065BEUI+ suitable for deployment in industrial enclosures and automotive under-hood environments where ambient temperatures exceed 70°C.
Does the MAX1065BEUI+ include an internal voltage reference?
Yes, the MAX1065BEUI+ integrates a factory-trimmed 4.096 V internal reference with ±35 ppm/°C temperature coefficient and 4.056 V to 4.136 V output tolerance over temperature. The reference is buffered and accessible at the REF pin; REFADJ allows fine adjustment or external reference selection. Using the internal reference eliminates external component count and PCB area - a key advantage confirmed in the device's typical operating circuit and electrical characteristics tables.
How does the R/C pin control power modes in the MAX1065BEUI+?
The R/C pin on the MAX1065BEUI+ selects post-conversion power state during the second falling edge of CS: low enables standby mode (reference remains active, supply current <1 mA), while high triggers shutdown mode (reference powered down, supply current drops to 0.5 µA typ). This behavior is explicitly defined in the "Selecting Standby or Shutdown Mode" section and timing diagrams - enabling per-conversion energy optimization without firmware overhead.
What is the purpose of the EOC pin on the MAX1065BEUI+?
The EOC (End of Conversion) pin on the MAX1065BEUI+ is an active-low, open-drain status flag that falls when conversion completes and data is ready for readout. It synchronizes µP data capture - allowing polling or interrupt-driven reads - and ensures timing margin before the third CS falling edge loads D0–D13 onto the bus. EOC timing is specified as tEOC ≤ 40 ns (DVDD ≥ 4.75 V), directly supporting high-throughput parallel interfacing.
Can the MAX1065BEUI+ operate with separate analog and digital supply voltages?
Yes, the MAX1065BEUI+ supports independent analog (AVDD: 4.75 V to 5.25 V) and digital (DVDD: 2.7 V to 5.25 V) supplies, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. This dual-supply capability allows interfacing with 3.3 V microcontrollers while maintaining 5 V analog precision - provided AGND and DGND are separated and joined at a single star point near the device, per layout guidelines in the datasheet.
MAX1065BEUI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 165k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- 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:
- 5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1065BEUI+ FAQ
1.How can I place an order for MAX1065BEUI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1065BEUI+ 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 MAX1065BEUI+ reliable?
The price and inventory of MAX1065BEUI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1065BEUI+ is usually 5 days.
3.What payment methods are accepted for MAX1065BEUI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1065BEUI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1065BEUI+?
MAX1065BEUI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1065BEUI+ 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 MAX1065BEUI+?
For technical support, including MAX1065BEUI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1065BEUI+ requirements.
6.How does Aetrix verify that MAX1065BEUI+ is sourced from the original manufacturer or authorized distributors?
All MAX1065BEUI+ 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 MAX1065BEUI+ meets industry standards.
7.What is the process for return or replacement of MAX1065BEUI+?
All MAX1065BEUI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1065BEUI+, 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 MAX1065BEUI+ part is unused and in its original packaging.
Return procedure for MAX1065BEUI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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