My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1285BESA+T
- Part No.:
- MAX1285BESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1285BESA+T.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,100
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX1285BESA+T from Maxim Integrated is a 12-bit, 300ksps serial analog-to-digital converter (ADC) operating from a single +2.7V to +3.6V supply, featuring an internal +2.5V reference, ±1LSB INL/DNL, and SPI/QSPI/MICROWIRE 3-wire interface - designed for precision data acquisition in space- and power-constrained battery-powered instruments.
For engineers reviewing the MAX1285BESA+T datasheet, MAX1285BESA+T pinout, MAX1285BESA+T application, or MAX1285BESA+T equivalent, this page delivers verified electrical specs, validated SO-8 pin mapping, real-world use cases in medical and portable sensing, and two confirmed alternative parts with documented functional and supply-voltage differences.
Technical Context
The MAX1285BESA+T employs a successive-approximation register (SAR) architecture with integrated track/hold and internal 2.5V reference, enabling unipolar 0–2.5V input range digitization without external components. Its conversion is initiated by CS falling edge and clocked by SCLK up to 4.8MHz.
It operates in two modes: normal (2.5mA typical supply current at 300ksps) and shutdown (2µA typical), with wake-up delay dependent on REF bypass capacitor charge state. Acquisition time is fixed at 625ns, and aperture jitter is <50ps - critical for high-fidelity sampling of transient signals up to 3MHz full-power bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for sub-millivolt analog resolution (1 LSB = 610 µV at 2.5V reference) |
| Sampling Rate | 300ksps - supports real-time capture of signals up to 250kHz full-linear bandwidth with SINAD >68dB |
| Supply Voltage | +2.7V to +3.6V - enables direct integration into 3.3V systems without level-shifting or LDO overhead |
| INL / DNL | ±1 LSB max - guarantees monotonicity and no missing codes across -40°C to +85°C industrial temperature range |
| Internal Reference | +2.5V ±20mV (2.48V–2.52V) - eliminates need for external reference; tempco ±15ppm/°C ensures stable scaling over temperature |
| Power Consumption | 2.5mA typical at 300ksps - enables >100-hour operation on a 900mAh Li-ion cell in periodic-sampling mode |
| Serial Interface | SPI/QSPI/MICROWIRE 3-wire - requires only SCLK, CS, and DOUT; compatible with standard microcontroller peripherals without glue logic |
Pinout & Package
MAX1285BESA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead(Pb)-free, with 1.27mm pitch and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Positive supply input | Accepts +2.7V to +3.6V; must be bypassed with 0.1µF and 10µF capacitors to analog ground for noise immunity |
| 2 AIN | Analog input | Unipolar 0–2.5V input node; 18pF input capacitance; protected to (GND −0.3V) to (VDD +0.3V) |
| 3 SHDN | Active-low shutdown control | Pulling low reduces supply current to 2µA; 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 and digital ground | Single-point star ground connection required; separates analog and digital return paths |
| 6 DOUT | Serial data output | Three-state, MSB-first output; transitions 20ns after SCLK rising edge; high-impedance when CS = high |
| 7 CS | Active-low chip select | Falling edge initiates conversion and enables DOUT; minimum pulse width 100ns |
| 8 SCLK | Serial clock input | Drives conversion timing and data shift-out; max frequency 4.8MHz; 40–60% duty cycle required |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Eliminates dual-rail design complexity and reduces BOM count in portable 3.3V systems |
| Integrated track/hold + SAR core | Removes need for external sample-hold circuitry; 625ns acquisition time supports fast signal settling |
| On-chip 2.5V reference | Provides stable scaling without external reference IC or resistor divider, reducing layout sensitivity |
| Low-power shutdown mode | Reduces quiescent current to 2µA, enabling energy-efficient duty-cycled sensing in IoT endpoints |
| Pin-compatible upgrade path | Direct replacement for MAX1241 in existing designs, delivering 3× higher throughput without PCB changes |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 100Hz intervals. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from analog front-end op-amps and sensors. Use Value: 300ksps sampling headroom allows oversampling for noise reduction; internal reference ensures consistent calibration across units. |
Use Scenario: Handheld ECG monitor acquiring biopotential signals with 12-bit resolution and low power consumption. IC Role / Device Role / Timing Role: Signal-chain ADC capturing amplified and filtered analog bio-signals before digital processing. Use Value: ±1LSB linearity preserves diagnostic waveform fidelity; 2.5V reference matches common sensor excitation levels. |
| Battery-Powered Instruments | Process Control Sensors |
Use Scenario: Field-deployable multimeter with auto-ranging analog inputs and LCD display powered by AA batteries. IC Role / Device Role / Timing Role: High-accuracy ADC converting scaled voltage/current measurements for digital display and storage. Use Value: Single 3.3V supply simplifies power architecture; shutdown mode extends battery life between measurements. |
Use Scenario: Industrial temperature transmitter using RTD or thermocouple with local signal conditioning and 4–20mA loop output. IC Role / Device Role / Timing Role: Precision ADC digitizing conditioned sensor output prior to isolation and current-loop modulation. Use Value: -40°C to +85°C rating ensures reliability in harsh enclosures; 3MHz full-power bandwidth supports fast thermal transients. |
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 114ksps max rate; same SO-8 package and 2.5V reference; requires external clock or uses internal oscillator | Lower throughput limits dynamic signal capture; suitable for static or slow-varying measurements only | Select when power budget is tighter and sampling rate ≤100ksps suffices; not recommended for real-time waveform capture |
| ADS7822U | TI 12-bit, 200ksps SAR ADC; 2.7–5.25V supply; no internal reference - requires external 2.5V reference | Higher supply flexibility but adds reference IC, decoupling, and layout complexity | Choose when system already includes a precision reference rail; avoid if minimizing component count is critical |
Compared with MAX1285BESA+T, MAX1241BCSA+ trades speed for lower active current, while ADS7822U offers wider supply range at the cost of external reference dependency - making MAX1285BESA+T optimal for compact, self-contained 3.3V data loggers requiring guaranteed 300ksps performance.
Availability
MAX1285BESA+T is available at Aetrix Electronics and suitable for portable data logging, battery-powered instrumentation, and medical sensing applications requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX1285BESA+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 communications systems.
The MAX1284/MAX1285 product line was engineered for low-power, high-accuracy data acquisition in size- and energy-constrained portable equipment - emphasizing integration, ease of interface, and guaranteed performance over extended temperature ranges.
FAQ
What is the maximum sampling rate of the MAX1285BESA+T?
The MAX1285BESA+T achieves a maximum sampling rate of 300ksps under specified conditions: VDD = +2.7V to +3.6V, fSCLK = 4.8MHz, and 16 clock cycles per conversion. This rate is sustained across its full -40°C to +85°C operating range and enables digitization of signals with up to 250kHz full-linear bandwidth while maintaining SINAD >68dB.
Does the MAX1285BESA+T require an external reference voltage?
No, the MAX1285BESA+T does not require an external reference voltage. It integrates a factory-trimmed +2.5V reference (2.48V–2.52V) on the REF pin, which serves both the internal SAR DAC and can be used externally. A 4.7µF bypass capacitor is mandatory at REF for stability; the reference is disabled during shutdown (SHDN = low).
What serial interface protocols does the MAX1285BESA+T support?
The MAX1285BESA+T supports SPI, QSPI, and MICROWIRE 3-wire serial interfaces natively. It requires only SCLK, CS, and DOUT connections. For SPI/MICROWIRE, configure CPOL = 0 and CPHA = 0; for QSPI, use CPOL = 0 and CPHA = 1. No external logic is needed - the device outputs 12-bit data in MSB-first format with three leading zeros.
How does the shutdown mode affect power consumption and wake-up time in the MAX1285BESA+T?
In shutdown mode (SHDN = low), the MAX1285BESA+T draws only 2µA typical supply current. Wake-up time depends on the charge state of the 4.7µF REF bypass capacitor: after short shutdown periods (<100ms), wake-up is near-instantaneous; after longer periods (>1s), up to 2ms may be required for REF to stabilize before accurate conversions resume.
Is the MAX1285BESA+T pin-compatible with other devices in the MAX128x family?
Yes, the MAX1285BESA+T is pin-compatible with the MAX1284BESA+, MAX1240, and MAX1241 in the 8-pin SO package. This allows drop-in upgrades: replacing a MAX1241 with MAX1285BESA+T retains identical PCB layout while increasing sampling rate from 114ksps to 300ksps and improving dynamic performance (SINAD 70dB vs. 69dB typical).
MAX1285BESA+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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1285BESA+T FAQ
1.How can I place an order for MAX1285BESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1285BESA+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 MAX1285BESA+T reliable?
The price and inventory of MAX1285BESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1285BESA+T is usually 5 days.
3.What payment methods are accepted for MAX1285BESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1285BESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1285BESA+T?
MAX1285BESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1285BESA+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 MAX1285BESA+T?
For technical support, including MAX1285BESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1285BESA+T requirements.
6.How does Aetrix verify that MAX1285BESA+T is sourced from the original manufacturer or authorized distributors?
All MAX1285BESA+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 MAX1285BESA+T meets industry standards.
7.What is the process for return or replacement of MAX1285BESA+T?
All MAX1285BESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1285BESA+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 MAX1285BESA+T part is unused and in its original packaging.
Return procedure for MAX1285BESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1285BESA+T 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…
