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Analog Devices Inc./Maxim Integrated MAX1085ACSA+T
- Part No.:
- MAX1085ACSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1085ACSA+T.pdf
- Description:
- IC ADC 10BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,326
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Product details
Overview
MAX1085ACSA+T 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, features an internal track/hold circuit, and communicates via SPI/QSPI/MICROWIRE 3-wire serial interface - enabling direct connection to microcontrollers without level-shifting or external logic in portable data loggers and medical instruments.
For engineers reviewing the MAX1085ACSA+T datasheet, MAX1085ACSA+T pinout, MAX1085ACSA+T application, or MAX1085ACSA+T equivalent, this page delivers verified electrical specs (INL ±0.5 LSB, DNL ±1.0 LSB, tCONV 3.3 µs), package mapping (8-pin SO), functional pin roles, real-world use cases, and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX1085ACSA+T employs a successive-approximation register (SAR) architecture with integrated track/hold, enabling accurate sampling of analog signals up to 250kHz full-linear bandwidth. Its internal +2.5V reference (±15 ppm/°C tempco, 2.48V–2.52V output) drives both the ADC core and external circuitry, eliminating need for external references in space-constrained designs.
Conversion is initiated by a falling edge on CS, synchronized to an external SCLK (up to 4.8MHz), with data output in unipolar MSB-first format: three leading zeros followed by 10 data bits and two sub-bits. The device supports normal and shutdown modes, reducing supply current to 2µA (typ) when SHDN is asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR - delivers 1024 discrete digital codes over 0–2.5V input range (1 LSB = 2.44 mV) |
| Sampling Rate | 300 ksps - supports real-time acquisition of signals up to 250 kHz full-linear bandwidth |
| Supply Voltage | +2.7V to +3.6V - enables direct integration into 3V battery-powered systems without regulators |
| Internal Reference | +2.5V ±20 mV (2.48V–2.52V) - eliminates external reference IC, saves PCB area and BOM cost |
| INL / DNL | ±0.5 LSB / ±1.0 LSB - guarantees monotonicity and <0.05% end-point linearity error after calibration |
| Power Consumption | 2.5 mA at 300 ksps - draws only 7.5 mW at 3V, critical for multi-day battery operation |
| Aperture Jitter | <50 ps - limits SNR degradation to ≤60 dB at 75 kHz input, preserving signal fidelity |
Pinout & Package
MAX1085ACSA+T is housed in an 8-pin Small Outline (SO) package, RoHS-compliant and lead(Pb)-free. Pin functions are electrically 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; requires 0.1µF + 10µF local bypassing to analog ground for noise immunity |
| AIN (Pin 2) | Analog input | Unipolar 0–VREF (0–2.5V) sampling node; input capacitance 18 pF; protected to GND–0.3V / VDD+0.3V |
| SHDN (Pin 3) | Active-low shutdown control | Pulling low reduces IDD to 2 µA (typ); wake-up time depends on REF capacitor discharge (≤1.4 ms) |
| REF (Pin 4) | Internal reference output | 2.5V source capable of sourcing 800 µA; must be bypassed with 4.7 µF capacitor for stability |
| GND (Pin 5) | Analog/digital common ground | Single-point "star" ground connection required; separates analog return path from digital noise sources |
| DOUT (Pin 6) | Serial data output | Three-state CMOS output; outputs 13-bit frame (3 zeros + 10 data + 2 sub-bits); valid 20 ns after SCLK rise |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion and hold; rising edge disables DOUT (high-impedance state) |
| SCLK (Pin 8) | Serial clock input | Drives conversion timing; max 4.8 MHz; 50% duty cycle required; controls bit-shift timing for SPI/QSPI/MICROWIRE |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Eliminates dual-rail design complexity and reduces system power management overhead in 3V embedded systems |
| Integrated track/hold + reference | Removes need for external sample-hold amplifier and voltage reference IC, shrinking solution size by ≥3 components |
| SPI/QSPI/MICROWIRE compatibility | Enables plug-and-play interfacing with ARM Cortex-M, PIC, and MSP430 microcontrollers without glue logic |
| Low-power shutdown mode | Reduces average current to µA-level between conversions - essential for duty-cycled sensor nodes and wearables |
| 8-pin SO package | Standard footprint compatible with automated assembly; 5.0 mm × 4.0 mm body enables high-density PCB layouts |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure every 100 ms. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog sensor outputs; internal reference ensures stable scaling across battery discharge curve. Use Value: 300 ksps throughput and 2.5 mA active current enable >72-hour runtime on a 2000 mAh Li-ion cell with 100 ms sampling interval. |
Use Scenario: Handheld ECG front-end acquiring lead-II differential voltage with 12-bit effective resolution requirement. IC Role / Device Role / Timing Role: Precision 10-bit sampling stage preceding digital filtering; low aperture jitter preserves QRS complex fidelity. Use Value: ±0.5 LSB INL and <50 ps aperture jitter support diagnostic-grade waveform capture without post-calibration linearization. |
| Battery-Powered Instruments | Pen Digitizers |
Use Scenario: Portable multimeter measuring DC voltage, AC RMS, and resistance using auto-ranging front-end. IC Role / Device Role / Timing Role: Primary ADC for main measurement channel; internal 2.5V reference serves as stable scaling reference for all ranges. Use Value: Single 3V supply operation and integrated reference reduce component count by 2–3 parts versus discrete reference + ADC solutions. |
Use Scenario: Active stylus digitizer tablet capturing pen position at ≥200 Hz with sub-millimeter accuracy. IC Role / Device Role / Timing Role: High-speed sampling of resistive or capacitive touch sensor array outputs; fast 3.3 µs conversion time minimizes latency. Use Value: 300 ksps rate and 250 kHz full-linear bandwidth support smooth, low-lag pen tracking even during rapid strokes. |
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 | 2.7V–5.25V supply; 1 MSPS; no internal reference (requires external 2.5V ref); 8-pin SO package | Higher speed but adds external reference and bypassing complexity; less suitable for ultra-low-power battery systems | Select when >300 ksps sampling is required and board space allows external reference placement. |
| MAX11100ETE+ | 12-bit resolution; 500 ksps; +2.5V internal reference; 16-pin TQFN (3mm × 3mm); SPI-only interface | Higher resolution and smaller footprint, but incompatible pinout and package; requires PCB redesign | Choose for upgraded precision in new designs where miniaturization justifies layout change and higher cost. |
Compared with ADS7822U and MAX11100ETE+, the MAX1085ACSA+T uniquely balances 300 ksps throughput, integrated reference, 2.5 mA power draw, and drop-in 8-pin SO compatibility - making it optimal for cost-sensitive, space-constrained, battery-operated 10-bit ADC upgrades.
Availability
MAX1085ACSA+T is available at Aetrix Electronics and suitable for portable data logging, battery-powered instrumentation, and medical sensor interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1085ACSA+T 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 consumer applications.
The MAX1085ACSA+T belongs to Maxim's precision low-power ADC product line, designed specifically for space- and energy-constrained systems requiring integrated reference, serial interface simplicity, and guaranteed monotonic 10-bit performance.
FAQ
What is the operating temperature range of the MAX1085ACSA+T?
The MAX1085ACSA+T is specified for commercial temperature operation from 0°C to +70°C. This range is confirmed in the Ordering Information table of the official datasheet (Rev 1, 12/10), where "MAX1085ACSA+" explicitly maps to the 0°C to +70°C grade. It is not rated for extended industrial or automotive temperature ranges.
Does the MAX1085ACSA+T require an external reference voltage?
No, the MAX1085ACSA+T does not require an external reference voltage. It integrates a factory-trimmed +2.5V reference (2.48V to 2.52V) on-chip, accessible at the REF pin. The datasheet mandates a 4.7 µF bypass capacitor at REF for stability, but no external reference IC is needed - a key differentiator from alternatives like the ADS7822U.
What is the maximum serial clock frequency supported by the MAX1085ACSA+T?
The MAX1085ACSA+T supports a maximum serial clock (SCLK) frequency of 4.8 MHz, as specified in the ELECTRICAL CHARACTERISTICS-MAX1085 section under "Serial Clock Frequency". This limit applies across the full operating temperature range (0°C to +70°C) and supply range (+2.7V to +3.6V), enabling reliable 300 ksps conversion throughput.
How does the shutdown mode affect power consumption of the MAX1085ACSA+T?
When SHDN is pulled low, the MAX1085ACSA+T enters shutdown mode and reduces its supply current to 2 µA (typical), as stated in the "Shutdown Supply Current" parameter (ISHDN). This ultra-low quiescent current extends battery life significantly in intermittent-sampling applications, though wake-up requires up to 1.4 ms for the internal reference to stabilize after exiting shutdown.
Is the MAX1085ACSA+T pin-compatible with the MAX1242/MAX1243 series?
Yes, the MAX1085ACSA+T is explicitly described in the datasheet as "pin-compatible, higher-speed upgrade to MAX1242/MAX1243". Both families use identical 8-pin SO packages and share matching pin assignments (VDD, AIN, SHDN, REF, GND, DOUT, CS, SCLK), allowing direct replacement without PCB modification - provided system-level timing and voltage requirements align.
MAX1085ACSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1085ACSA+T FAQ
1.How can I place an order for MAX1085ACSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1085ACSA+T 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 MAX1085ACSA+T reliable?
The price and inventory of MAX1085ACSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1085ACSA+T is usually 5 days.
3.What payment methods are accepted for MAX1085ACSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1085ACSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1085ACSA+T?
MAX1085ACSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1085ACSA+T 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 MAX1085ACSA+T?
For technical support, including MAX1085ACSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1085ACSA+T requirements.
6.How does Aetrix verify that MAX1085ACSA+T is sourced from the original manufacturer or authorized distributors?
All MAX1085ACSA+T 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 MAX1085ACSA+T meets industry standards.
7.What is the process for return or replacement of MAX1085ACSA+T?
All MAX1085ACSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1085ACSA+T, 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 MAX1085ACSA+T part is unused and in its original packaging.
Return procedure for MAX1085ACSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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