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Analog Devices Inc./Maxim Integrated MAX1085AESA+
- Part No.:
- MAX1085AESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1085AESA+.pdf
- Description:
- IC ADC 10BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,522
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Product details
Overview
The MAX1085AESA+ from Maxim Integrated is a 10-bit, 300ksps serial analog-to-digital converter (ADC) optimized for low-voltage, battery-powered systems. It operates from a single +2.7V to +3.6V supply, integrates a precision +2.5V internal reference (±0.5 LSB INL, ±1.0 LSB DNL), features SPI/QSPI/MICROWIRE 3-wire interface, and consumes only 2.5mA at full speed - making it ideal for portable data loggers and medical instrumentation.
For engineers reviewing the MAX1085AESA+ datasheet, MAX1085AESA+ pinout, MAX1085AESA+ application, or MAX1085AESA+ equivalent, key selection considerations include its -40°C to +85°C industrial temperature range, 8-pin SO package, 3MHz full-power bandwidth, 625ns track/hold acquisition time, and guaranteed no missing codes over temperature.
Technical Context
The MAX1085AESA+ employs a successive-approximation register (SAR) architecture with integrated track/hold and internal 2.5V reference. Its conversion is initiated by CS falling edge and clocked by an external SCLK up to 4.8MHz, outputting 10-bit unipolar data (MSB-first) plus three leading zeros via DOUT.
It supports two operational modes: normal (2.5mA IDD) and shutdown (2µA ISHDN). The internal reference is disabled during shutdown and requires up to 1.4ms wake-up time after SHDN deassertion when using a 4.7µF REF bypass capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR ADC with monotonic transfer function and no missing codes over temperature |
| Sampling Rate | 300ksps maximum - enables real-time capture of signals up to 250kHz full-linear bandwidth |
| Supply Voltage | +2.7V to +3.6V single supply - compatible with Li-ion and 3.3V logic systems |
| INL / DNL | ±0.5 LSB / ±1.0 LSB - ensures high DC accuracy for sensor measurement and calibration |
| Internal Reference | +2.50V ±2mV (±0.08%) with ±15ppm/°C tempco - eliminates need for external reference in space-constrained designs |
| Power Consumption | 2.5mA at 300ksps; 2µA in shutdown - extends battery life in intermittent-sampling applications |
| Aperture Jitter | <50ps - preserves SNR in medium-frequency signal digitization (e.g., 75kHz sine input) |
Pinout & Package
MAX1085AESA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free. Pin functions are validated per Maxim's official datasheet Rev 1 (12/10).
| 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 + 10µF capacitors |
| AIN (Pin 2) | Analog input | 0 to VREF (0–2.5V) unipolar range; protected by internal clamps (GND −0.3V to VDD +0.3V) |
| SHDN (Pin 3) | Active-low shutdown control | Pulling low reduces supply current to 2µA; wake-up delay depends on REF capacitor discharge |
| REF (Pin 4) | Internal reference output | 2.5V ±2mV source capable of driving ≤800µA; requires 4.7µF bypass for stability |
| GND (Pin 5) | Analog/digital ground | Single-point star ground connection required; separates analog and digital return paths |
| DOUT (Pin 6) | Serial data output | Three-state, MSB-first output; transitions 20ns after SCLK rising edge; high-impedance when CS = high |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion and hold mode; must remain low for ≥15 SCLK cycles to read full result |
| SCLK (Pin 8) | Serial clock input | Drives conversion timing; supports up to 4.8MHz; 50% duty cycle required |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Eliminates dual-rail power design complexity and reduces BOM count in portable systems |
| Integrated 2.5V reference | Removes external reference IC and associated layout sensitivity, saving >3mm² PCB area |
| SPI/QSPI/MICROWIRE compatibility | Direct interface to common microcontrollers without level shifters or glue logic |
| Low-power shutdown mode | Enables µA-level system sleep current when paired with host-controlled SHDN sequencing |
| 8-pin SO package | Standard footprint compatible with automated assembly; thermal resistance θJA = 170°C/W |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 100–300Hz. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from precision sensors; synchronized to microcontroller via CS/SCLK. Use Value: 300ksps sampling and 2.5mA active current enable >1 week runtime on 2000mAh Li-ion cell with 10s wake-up intervals. |
Use Scenario: Handheld ECG front-end acquiring lead-II differential signals with baseline drift correction. IC Role / Device Role / Timing Role: Low-noise, low-drift ADC capturing 250Hz bandwidth biopotential signals; internal reference ensures stable gain across temperature. Use Value: ±0.5 LSB INL and 60dB SINAD support diagnostic-grade waveform fidelity without external calibration. |
| Battery-Powered Instruments | Process Control Sensors |
Use Scenario: Field-deployable multimeter measuring DC voltage/current with autoranging and auto-zero. IC Role / Device Role / Timing Role: High-accuracy ADC for DC measurements; uses internal reference as both conversion reference and system calibration standard. Use Value: ±1.0 LSB DNL and no missing codes guarantee monotonic response essential for accurate autoranging decisions. |
Use Scenario: Industrial 4–20mA loop-powered transmitter monitoring tank level or flow rate. IC Role / Device Role / Timing Role: Signal conditioner ADC interfacing with bridge or RTD sensors; operates from loop-derived 3.3V rail. Use Value: 2.7–3.6V supply range matches regulated loop supply; 2µA shutdown current minimizes quiescent load on 4mA minimum loop budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7–5.25V supply; 200ksps; external reference required; 8-pin SOIC | Lacks internal reference - increases BOM and layout complexity but offers wider supply flexibility | Select when system already provides a high-precision external reference and supply exceeds 3.6V |
| MAX11100ETE+ | 12-bit resolution; 500ksps; +2.7V to +3.6V; internal 2.048V reference; 12-pin TDFN | Higher resolution and speed, but different pinout, smaller package, and lower reference voltage | Select when 12-bit accuracy and faster sampling are required, and board redesign is acceptable |
Compared with ADS7822U and MAX11100ETE+, the MAX1085AESA+ delivers optimal balance of integrated functionality (reference + low-voltage operation), proven industrial temperature reliability, and drop-in compatibility in existing 8-pin SO footprints - reducing validation effort for cost-sensitive portable designs.
Availability
MAX1085AESA+ is available at Aetrix Electronics and suitable for portable data logging, battery-powered instruments, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1085AESA+ 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 MAX1085AESA+ belongs to Maxim's precision low-power ADC product line, designed specifically for space- and energy-constrained systems where integration, accuracy, and temperature robustness are critical.
FAQ
What is the operating temperature range of the MAX1085AESA+?
The MAX1085AESA+ is rated for industrial operation from -40°C to +85°C. This range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the official datasheet (Rev 1, 12/10), and applies specifically to the ESA grade suffix. It ensures reliable performance in harsh environments such as outdoor instrumentation and factory-floor sensors.
Does the MAX1085AESA+ require an external reference voltage?
No, the MAX1085AESA+ does not require an external reference voltage. It integrates a factory-trimmed +2.50V ±2mV internal reference accessible at the REF pin. This reference drives the ADC core and can also supply up to 800µA to external circuitry, eliminating the need for a separate reference IC in most compact designs.
What is the minimum acquisition time (tACQ) for the MAX1085AESA+?
The MAX1085AESA+ has a specified track/hold acquisition time (tACQ) of 625ns, as stated in the Electrical Characteristics table for MAX1085 under Dynamic Specifications. This value represents the minimum time required for the internal hold capacitor to settle after CS falls, and must be respected to ensure full 10-bit accuracy across temperature.
Can the MAX1085AESA+ interface directly with an SPI master microcontroller?
Yes, the MAX1085AESA+ interfaces directly with SPI master controllers. It supports SPI mode 0 (CPOL = 0, CPHA = 0), requires only CS, SCLK, and DOUT connections, and outputs data MSB-first with three leading zeros. No level shifters or external logic are needed when VDD = 3.3V and the MCU I/O is 3.3V-tolerant.
How much power does the MAX1085AESA+ consume in shutdown mode?
In shutdown mode (SHDN = low), the MAX1085AESA+ draws just 2µA typical supply current, as specified in the Electrical Characteristics table under POWER SUPPLY. This ultra-low quiescent current makes it suitable for battery-powered applications where the ADC is idle for extended periods between measurements.
MAX1085AESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 300k
- 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:
- Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1085AESA+ FAQ
1.How can I place an order for MAX1085AESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1085AESA+ 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 MAX1085AESA+ reliable?
The price and inventory of MAX1085AESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1085AESA+ is usually 5 days.
3.What payment methods are accepted for MAX1085AESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1085AESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1085AESA+?
MAX1085AESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1085AESA+ 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 MAX1085AESA+?
For technical support, including MAX1085AESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1085AESA+ requirements.
6.How does Aetrix verify that MAX1085AESA+ is sourced from the original manufacturer or authorized distributors?
All MAX1085AESA+ 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 MAX1085AESA+ meets industry standards.
7.What is the process for return or replacement of MAX1085AESA+?
All MAX1085AESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1085AESA+, 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 MAX1085AESA+ part is unused and in its original packaging.
Return procedure for MAX1085AESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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