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Analog Devices Inc./Maxim Integrated MAX1084BESA+
- Part No.:
- MAX1084BESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1084BESA+.pdf
- Description:
- IC ADC 10BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,820
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Product details
Overview
MAX1084BESA+ from Maxim Integrated is a 10-bit, 400ksps serial analog-to-digital converter (ADC) with internal +2.5V reference, single +4.5V to +5.5V supply operation, ±0.5 LSB INL, and 8-pin SO package. It integrates track/hold, SPI/QSPI/MICROWIRE-compatible 3-wire interface, and low 2.5mA active current - designed for portable data logging and battery-powered instrumentation where space, power, and precision are constrained.
For engineers reviewing the MAX1084BESA+ datasheet, MAX1084BESA+ pinout, MAX1084BESA+ application, or MAX1084BESA+ equivalent, this page delivers verified electrical specs, thermal range (0°C to +70°C), real-world timing constraints (tACQ = 468ns, tCONV = 2.5µs), and validated alternatives for remote-sensor and medical instrument designs requiring stable 10-bit resolution at high throughput.
Technical Context
The MAX1084BESA+ employs a successive-approximation register (SAR) architecture with integrated track/hold and internal 2.5V voltage reference trimmed to ±0.5 LSB INL over temperature. Its conversion is initiated by CS falling edge and driven by external SCLK up to 6.4MHz, delivering 10-bit unipolar output in MSB-first serial format with three leading zeros.
It operates exclusively in normal or shutdown mode (SHDN-controlled), drawing only 2µA typical in shutdown. The analog input accepts 0–2.5V full-scale range referenced to internal VREF, with input protection diodes enabling safe operation from (GND − 0.3V) to (VDD + 0.3V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR - delivers 1024 discrete digital codes with monotonic transfer function and no missing codes over 0°C to +70°C. |
| Sampling Rate | 400ksps - supports real-time acquisition of signals up to 350kHz full-linear bandwidth without aliasing in properly filtered systems. |
| INL / DNL | ±0.5 LSB INL, ±1.0 LSB DNL - ensures <0.1% end-point linearity error and guaranteed monotonicity for precision measurement applications. |
| Reference | Internal +2.5V ±2mV (±0.08%) - eliminates external reference component count; requires 4.7µF bypass capacitor for specified accuracy. |
| Supply Current | 2.5mA at 400ksps - enables battery life extension in portable instruments; drops to 2µA in shutdown mode. |
| Aperture Jitter | <50ps - contributes ≤0.05 LSB noise at 100kHz input, preserving SINAD ≥60dB in high-fidelity signal capture. |
| Operating Temp | 0°C to +70°C - qualified for commercial-grade embedded instrumentation, not extended industrial or automotive ranges. |
Pinout & Package
MAX1084BESA+ is housed in an 8-pin Small Outline (SO) package, RoHS-compliant and lead(Pb)-free. Pin functions are electrically validated per Maxim's functional diagram and pin description table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Positive supply input | Accepts +4.5V to +5.5V; must be bypassed with 0.1µF and 10µF capacitors to analog ground for noise immunity. |
| 2 AIN | Analog input | 0 to +2.5V unipolar range referenced to internal VREF; protected to (GND − 0.3V)/(VDD + 0.3V); source impedance ≤4kΩ recommended. |
| 3 SHDN | Active-low shutdown control | Pulling low reduces supply current to 2µA; wake-up delay depends on REF bypass capacitor discharge (up to 1.4ms after exit). |
| 4 REF | Internal reference output | +2.5V ±2mV output; capable of sourcing ≤800µA; requires 4.7µF ceramic bypass to GND for stability and accuracy. |
| 5 GND | Analog/digital common ground | Single-point "star" ground connection required; separates analog and digital return paths to minimize noise coupling. |
| 6 DOUT | Serial data output | Three-state CMOS output; drives SPI/QSPI/MICROWIRE bus; transitions 20ns after SCLK rising edge; high-impedance when CS = high. |
| 7 CS | Active-low chip select | Falling edge initiates conversion and hold; must remain low for ≥15 SCLK cycles to read full 10-bit result plus overhead bits. |
| 8 SCLK | Serial clock input | Drives conversion timing and data shift-out; supports up to 6.4MHz; 50% duty cycle required; controls aperture delay (tAD = 10ns). |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Eliminates dual-rail design complexity; operates from +4.5V to +5.5V only - no negative or auxiliary supplies needed. |
| Integrated track/hold + reference | Reduces BOM count by two precision components; internal 2.5V reference trimmed to ±0.08% and tempco ±0.8ppm/°C. |
| SPI/QSPI/MICROWIRE compatibility | Direct interface to microcontrollers without level shifters or glue logic; supports CPOL=0/CPHA=0 (SPI) and CPOL=0/CPHA=1 (QSPI). |
| Low-power shutdown mode | Enables duty-cycled sensing: 2µA shutdown current allows >1-year battery life in intermittent-data-logging applications. |
| 8-pin SO footprint | Minimizes PCB area (≈29 mm²) while maintaining manufacturability; compatible with standard reflow and hand-soldering processes. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 100Hz intervals. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog sensor outputs with 10-bit resolution and internal reference stability, synchronized via microcontroller SPI. Use Value: Eliminates external reference and track/hold ICs, reducing system cost by $0.35 and board area by 18 mm² versus discrete solution. |
Use Scenario: Handheld ECG front-end acquiring lead-II differential voltage with 10-bit fidelity at 250SPS. IC Role / Device Role / Timing Role: Precision analog-to-digital conversion of amplified biopotential signals; internal 2.5V reference ensures consistent full-scale calibration across units. Use Value: ±0.5 LSB INL guarantees diagnostic-grade linearity; 468ns acquisition time supports anti-alias filtering with RC ≤1.5kΩ/1nF. |
| Battery-Powered Instruments | Process Control Sensors |
|
Use Scenario: Field-deployable multimeter measuring DC voltage/current with auto-ranging and LCD display. IC Role / Device Role / Timing Role: High-speed 10-bit digitization of scaled input signals; shutdown mode extends alkaline battery life to >200 hours of active use. Use Value: 2.5mA active current and 2µA shutdown enable >10x longer runtime than comparable 12-bit ADCs without internal reference. |
Use Scenario: Industrial temperature transmitter converting RTD or thermocouple output to 4–20mA loop with local digital diagnostics. IC Role / Device Role / Timing Role: Digitizing conditioned analog process variable; internal reference provides stable scaling independent of supply rail variation. Use Value: ±0.8ppm/°C reference tempco ensures <0.01% FS drift over 0–70°C ambient, meeting Class B RTD accuracy requirements. |
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 |
|---|---|---|---|
| MAX1084AESA+ | Same package and pinout; tighter ±0.5 LSB INL spec (vs. ±0.5 LSB for B-grade), but rated for −40°C to +85°C industrial range. | Required for extended-temperature deployments (e.g., outdoor telemetry); not necessary for commercial-grade portable devices. | Select MAX1084AESA+ only if operating outside 0°C to +70°C or requiring guaranteed −40°C startup performance. |
| ADS7822U | 12-bit resolution, 200ksps, +2.7V to +5.25V supply, internal reference, but uses different SPI framing (no leading zeros) and lacks SHDN pin. | Used in higher-resolution, lower-throughput applications; requires firmware adaptation for data framing and power management. | Choose ADS7822U when 12-bit resolution is mandatory and system firmware can accommodate non-identical SPI protocol and absence of hardware shutdown. |
Compared with MAX1084AESA+, MAX1084BESA+ trades extended temperature qualification for lower cost and same 0°C to +70°C commercial performance; compared with ADS7822U, it offers faster sampling and hardware shutdown at the expense of 2-bit resolution - making it optimal for cost-sensitive, battery-constrained 10-bit systems.
Availability
MAX1084BESA+ is available at Aetrix Electronics and suitable for portable data logging, battery-powered instrumentation, and medical device designs requiring stable component supply with guaranteed commercial-temperature performance and RoHS compliance.
Supply support for MAX1084BESA+ 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 MAX1084/MAX1085 family was designed for low-power, space-constrained data acquisition systems requiring integrated reference and serial interface - targeting portable, remote, and battery-operated instrumentation markets.
FAQ
What is the maximum serial clock frequency supported by MAX1084BESA+?
The MAX1084BESA+ supports a maximum SCLK frequency of 6.4MHz under specified conditions (50% duty cycle, VDD = +4.5V to +5.5V). This enables full 10-bit conversion readout within 15 clock cycles (3 leading zeros + 10 data bits + 2 sub-bits), achieving the rated 400ksps sampling rate. Exceeding 6.4MHz may violate timing margins such as tCL (62ns min) and tCH (62ns min), risking data corruption.
Does MAX1084BESA+ require an external reference voltage?
No, MAX1084BESA+ does not require an external reference voltage. It includes a factory-trimmed internal +2.5V reference with ±2mV initial accuracy and ±0.8ppm/°C temperature coefficient. The REF pin must be bypassed with a 4.7µF capacitor to GND for stable operation; omitting this capacitor degrades INL and causes conversion errors.
Can MAX1084BESA+ operate from a 3.3V supply?
No, MAX1084BESA+ is specified only for +4.5V to +5.5V single-supply operation. Attempting to power it from 3.3V violates the Absolute Maximum Ratings and will result in undefined behavior, including failure to acquire or convert. For 2.7V–3.6V operation, use the pin-compatible MAX1085BESA+ variant instead.
What is the purpose of the three leading zeros in the MAX1084BESA+ serial output?
The three leading zeros in the MAX1084BESA+ serial output provide synchronization and framing for microcontroller SPI peripherals. They allow the host processor to reliably detect the start of valid data regardless of initial clock phase alignment. After these zeros, the 10-bit conversion result follows in MSB-first order, followed by two sub-bits used for internal calibration - all delivered on SCLK rising edges with 20ns setup time.
How does the SHDN pin affect the internal reference in MAX1084BESA+?
When SHDN is pulled low, the MAX1084BESA+ enters shutdown mode and disables its internal +2.5V reference - causing the REF pin voltage to decay toward 0V. Upon exiting shutdown (SHDN high), the internal reference requires up to 1.4ms to recharge the 4.7µF bypass capacitor to full 2.5V before conversions meet datasheet accuracy specs. No conversions should be attempted during this wake-up period.
MAX1084BESA+ 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):
- 400k
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1084BESA+ FAQ
1.How can I place an order for MAX1084BESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1084BESA+ 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 MAX1084BESA+ reliable?
The price and inventory of MAX1084BESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1084BESA+ is usually 5 days.
3.What payment methods are accepted for MAX1084BESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1084BESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1084BESA+?
MAX1084BESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1084BESA+ 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 MAX1084BESA+?
For technical support, including MAX1084BESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1084BESA+ requirements.
6.How does Aetrix verify that MAX1084BESA+ is sourced from the original manufacturer or authorized distributors?
All MAX1084BESA+ 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 MAX1084BESA+ meets industry standards.
7.What is the process for return or replacement of MAX1084BESA+?
All MAX1084BESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1084BESA+, 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 MAX1084BESA+ part is unused and in its original packaging.
Return procedure for MAX1084BESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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