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Analog Devices Inc./Maxim Integrated MAX1285BCSA+T
- Part No.:
- MAX1285BCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1285BCSA+T.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,032
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Product details
Overview
MAX1285BCSA+T from Maxim Integrated is a 12-bit serial analog-to-digital converter (ADC) optimized for low-power, battery-operated systems. It operates from a single +2.7V to +3.6V supply, delivers 300ksps sampling rate, features an internal +2.5V reference with ±15ppm/°C tempco, ±1LSB INL/DNL accuracy, and interfaces via SPI/QSPI/MICROWIRE 3-wire serial bus. It is used in portable medical instruments and remote sensor nodes where space, power, and precision are constrained.
For engineers reviewing the MAX1285BCSA+T datasheet, MAX1285BCSA+T pinout, MAX1285BCSA+T application, or MAX1285BCSA+T equivalent, this page provides verified electrical specifications, validated SO-8 pin mapping, real-world use scenarios in battery-powered instrumentation, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX1285BCSA+T employs a successive-approximation register (SAR) architecture with integrated track/hold and trimmed internal 2.5V reference. Its conversion timing is driven by external SCLK (up to 4.8MHz), requiring 16 clock cycles per sample and producing unipolar 12-bit output with three leading zeros in MSB-first format.
It supports normal and shutdown modes: SHDN = GND reduces supply current to ≤10µA, while wake-up delay depends on REF bypass capacitor discharge. Input full-scale range is 0V to VREF (0–2.5V), and acquisition time is 625ns minimum with source impedance ≤2kΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes across 0–2.5V input range (1 LSB = 610 µV) |
| Sampling Rate | 300 ksps - supports real-time digitization of signals up to 250 kHz full-linear bandwidth |
| Supply Voltage | +2.7V to +3.6V - enables direct operation from single Li-ion or dual-AA battery rails |
| INL / DNL | ±1 LSB max - guarantees monotonicity and no missing codes over 0°C to +70°C |
| Reference Voltage | +2.50 V ±20 mV - internally trimmed, stable output usable as system reference for other circuitry |
| Power Consumption | 2.5 mA at 300 ksps - enables <10 mW active power draw at 3.3V, critical for portable designs |
| Serial Interface | SPI/QSPI/MICROWIRE 3-wire - requires only SCLK, CS, DOUT; no level-shifting or glue logic needed |
Pinout & Package
MAX1285BCSA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead(Pb)-free. Pin assignments are validated per Maxim's official datasheet Rev 2 (12/10).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Positive supply input | Accepts +2.7V to +3.6V; must be bypassed with 0.1µF + 10µF to GND for noise immunity |
| 2 AIN | Analog input | Single-ended input referenced to GND; 0–2.5V range; 18pF input capacitance |
| 3 SHDN | Active-low shutdown control | Pulling low reduces IDD to ≤10 µA; wake-up delay depends on REF capacitor charge state |
| 4 REF | Internal reference output | 2.5V ±20mV source; requires ≥4.7µF bypass capacitor; disabled during shutdown |
| 5 GND | Analog/digital ground | Single-point star ground connection required; separates analog and digital return paths |
| 6 DOUT | Serial data output | Three-state, MSB-first; transitions 20ns after SCLK rising edge; high-impedance when CS = high |
| 7 CS | Active-low chip select | Falling edge initiates conversion; must remain low for full 15-clock cycle data transfer |
| 8 SCLK | Serial clock input | Drives conversion and data shift-out; max 4.8 MHz; 40–60% duty cycle required |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Eliminates need for dual-rail supplies or charge pumps in portable systems |
| Integrated track/hold + reference | Reduces BOM count by removing external T/H amplifier and voltage reference ICs |
| Low-power shutdown mode | Enables microamp-level sleep current, extending battery life between measurements |
| Pin-compatible upgrade path | Direct replacement for MAX1241 in existing layouts, supporting higher throughput without redesign |
| Robust analog input protection | Withstands −0.3V to (VDD + 0.3V); allows safe interfacing with sensors lacking external clamping |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Continuous vital-sign monitoring (e.g., ECG front-end, pulse oximetry) in handheld diagnostic devices powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog biosignals; synchronized to µC via SPI with deterministic 3.3µs conversion latency. Use Value: 300ksps sampling and ±1 LSB linearity ensure accurate waveform capture; 2.5mA active current extends runtime beyond 72 hours on a 500mAh cell. |
Use Scenario: Environmental parameter logging (temperature, humidity, pressure) in field-deployed IoT nodes operating for months on primary batteries. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated periodically by µC; enters shutdown between samples to minimize quiescent draw. Use Value: Shutdown current ≤10µA and fast wake-up enable average system current <5µA; internal 2.5V reference eliminates external component drift errors. |
| Pen Digitizers | Industrial Process Monitoring |
|
Use Scenario: High-precision coordinate acquisition in stylus-based input systems for tablets and signature pads. IC Role / Device Role / Timing Role: Digitizes analog position signals from resistive or capacitive sensor grids; interfaces directly to host MCU via QSPI for minimal latency. Use Value: 625ns acquisition time and 3MHz small-signal bandwidth support sub-millisecond response; SO-8 footprint fits tight board space constraints. |
Use Scenario: Analog sensor conditioning in factory-floor PLC I/O modules measuring temperature, flow, or strain under wide ambient temperature swings. IC Role / Device Role / Timing Role: Signal-chain ADC in isolated analog input channels; operates across 0°C to +70°C industrial grade range with guaranteed INL/DNL performance. Use Value: ±15ppm/°C reference tempco and ±1 LSB INL ensure measurement stability without recalibration across temperature; SO-8 package supports automated assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1241BCSA+ | Slower 110ksps sampling rate; same SO-8 pinout and 2.7–3.6V supply; no internal reference (requires external REF) | Lower throughput and added external reference increase BOM cost and layout area; suitable only where speed <110ksps suffices | Select MAX1241BCSA+ only if system sampling requirement is ≤110ksps and external reference is already present |
| ADS7822U | TI part: 12-bit, 200ksps, +2.7–5.25V supply, internal 2.5V ref, SPI-compatible but uses different timing (no CS hold requirement) | Higher supply voltage flexibility but lacks guaranteed ±1 LSB INL over full temp range; not pin-compatible | Choose ADS7822U when wider supply range is needed and layout can accommodate non-pin-compatible footprint |
Compared with MAX1241BCSA+, MAX1285BCSA+T delivers 2.7× higher throughput and eliminates external reference dependency; versus ADS7822U, it offers tighter DC accuracy specs and proven interoperability with QSPI timing, though at narrower supply range.
Availability
MAX1285BCSA+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and industrial process monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX1285BCSA+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX1284/MAX1285 product line delivers low-power, single-supply 12-bit SAR ADCs with integrated references for space-constrained, battery-sensitive systems requiring high DC accuracy and simple digital interfacing.
FAQ
What is the maximum serial clock frequency supported by MAX1285BCSA+T?
The MAX1285BCSA+T supports a maximum SCLK frequency of 4.8 MHz, as specified in its electrical characteristics table under "Serial Clock Frequency" for the MAX1285 variant. This timing enables the full 300 ksps sampling rate with 16 clock cycles per conversion. Exceeding 4.8 MHz may cause timing violations or incomplete data transfers, and is not guaranteed across temperature or voltage extremes.
Does MAX1285BCSA+T require an external reference voltage?
No, MAX1285BCSA+T does not require an external reference voltage. It integrates a factory-trimmed +2.50 V ±20 mV reference connected to the REF pin, which serves both the internal SAR DAC and can be used externally. A minimum 4.7 µF bypass capacitor is mandatory at REF to ensure stability and accuracy during conversion.
Can MAX1285BCSA+T operate from a 3.3V supply?
Yes, MAX1285BCSA+T is fully specified to operate from +2.7V to +3.6V, making 3.3V a nominal and recommended supply voltage. At VDD = 3.3V, typical supply current is 2.5 mA during conversion, and all AC/DC performance parameters-including INL, DNL, SINAD, and THD-remain within datasheet limits across 0°C to +70°C.
What is the function of the SHDN pin on MAX1285BCSA+T?
The SHDN pin on MAX1285BCSA+T is an active-low shutdown control. When pulled low, it disables the internal reference, track/hold, and conversion circuitry, reducing supply current to ≤10 µA. The device wakes up automatically when SHDN returns high, but a 4.7 µF REF capacitor requires up to 2 ms to recharge before first conversion meets accuracy specs.
Is MAX1285BCSA+T pin-compatible with MAX1284BCSA+T?
Yes, MAX1285BCSA+T is pin-compatible with MAX1284BCSA+T - both use identical 8-pin SO packages and share identical pin functions (VDD, AIN, SHDN, REF, GND, DOUT, CS, SCLK). However, their supply ranges differ (+2.7–3.6V vs. +4.5–5.5V) and timing specs (e.g., max SCLK, conversion time) are not interchangeable; substitution requires voltage and timing validation.
MAX1285BCSA+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:
- Active
- Number of Bits:
- 12
- 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:
- -
MAX1285BCSA+T FAQ
1.How can I place an order for MAX1285BCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1285BCSA+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 MAX1285BCSA+T reliable?
The price and inventory of MAX1285BCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1285BCSA+T is usually 5 days.
3.What payment methods are accepted for MAX1285BCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1285BCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1285BCSA+T?
MAX1285BCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1285BCSA+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 MAX1285BCSA+T?
For technical support, including MAX1285BCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1285BCSA+T requirements.
6.How does Aetrix verify that MAX1285BCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX1285BCSA+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 MAX1285BCSA+T meets industry standards.
7.What is the process for return or replacement of MAX1285BCSA+T?
All MAX1285BCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1285BCSA+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 MAX1285BCSA+T part is unused and in its original packaging.
Return procedure for MAX1285BCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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