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Analog Devices Inc./Maxim Integrated MAX1284BCSA+
- Part No.:
- MAX1284BCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1284BCSA+.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:121
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Product details
Overview
MAX1284BCSA+ from Maxim Integrated is a 12-bit serial analog-to-digital converter (ADC) with internal +2.5V reference, single +4.5V to +5.5V supply operation, 400ksps sampling rate, ±1LSB INL/DNL, and SPI/QSPI/MICROWIRE 3-wire interface - used for precision data acquisition in space-constrained, low-power systems such as portable medical instruments and remote sensor nodes.
For engineers reviewing the MAX1284BCSA+ datasheet, MAX1284BCSA+ pinout, MAX1284BCSA+ application, or MAX1284BCSA+ equivalent, this page delivers verified electrical specs, package mapping, functional pin roles, real-world use cases, and validated alternative parts - all grounded in Maxim's official MAX1284/MAX1285 datasheet (Rev 2, 12/10).
Technical Context
The MAX1284BCSA+ implements a successive-approximation register (SAR) architecture with integrated track-and-hold (T/H), enabling precise digitization of analog signals up to 6MHz full-power bandwidth. Its conversion timing is synchronized to an external SCLK (up to 6.4MHz), with CS falling edge initiating hold mode and conversion start.
All digital I/O operates at TTL-compatible levels (VINH = 3.0V min, VINL = 0.8V max), and the device supports unipolar MSB-first serial output with three leading zeros. Internal reference regulation (±15ppm/°C tempco, 2.48–2.52V) eliminates need for external voltage references in most applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization. |
| Sampling Rate | 400ksps - supports real-time capture of signals up to 350kHz full-linear bandwidth. |
| INL / DNL | ±1 LSB max - ensures monotonicity and <0.025% end-point linearity error across temperature. |
| Supply Voltage | +4.5V to +5.5V - compatible with standard 5V logic rails and industrial power domains. |
| Power Consumption | 2.5mA at 400ksps - enables battery-powered operation with sub-13mW active power (5V × 2.5mA). |
| Reference Voltage | +2.5V internal (2.48–2.52V, ±15ppm/°C) - stable, factory-trimmed reference eliminating external component cost and layout area. |
| Serial Interface | SPI/QSPI/MICROWIRE 3-wire - requires only SCLK, CS, and DOUT; no level shifters or glue logic needed. |
Pinout & Package
MAX1284BCSA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead(Pb)-free. Pin functions are electrically validated per Maxim's datasheet Figure 3 and Pin Description table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +4.5V to +5.5V; powers analog core, reference, and digital interface. |
| AIN (Pin 2) | Analog input | 0–2.5V unipolar range referenced to internal VREF; 18pF input capacitance. |
| SHDN (Pin 3) | Active-low shutdown control | Pulling low reduces supply current to 2µA typical; wake-up delay ≤2ms after deassertion. |
| REF (Pin 4) | Internal reference output | 2.5V ±10mV source capable of driving ≥800µA; requires 4.7µF bypass capacitor. |
| GND (Pin 5) | Analog/digital ground | Single-point star ground connection required to minimize noise coupling into SAR core. |
| DOUT (Pin 6) | Serial data output | Three-state CMOS output; MSB-first format with three leading zeros; transitions 20ns after SCLK rising edge. |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion and forces DOUT out of high-impedance state. |
| SCLK (Pin 8) | Serial clock input | Drives conversion timing and data shifting; supports up to 6.4MHz (50% duty cycle). |
Key Features
| Feature | Design Value |
|---|---|
| Internal track-and-hold | Enables accurate sampling of fast transients without external T/H circuitry; 468ns acquisition time. |
| On-chip +2.5V reference | Eliminates external reference IC and associated calibration; ±15ppm/°C drift supports stable performance over 0°C to +70°C. |
| Low-power shutdown mode | Reduces IDD to 2µA typical, enabling microcontroller-gated sampling for ultra-low average power in intermittent-data systems. |
| Pin-compatible upgrade path | Direct replacement for MAX1240/MAX1241 with higher speed (400ksps vs. 133ksps) and improved linearity (±1LSB vs. ±2LSB). |
| Robust analog input protection | Clamped input allows safe operation from (GND − 0.3V) to (VDD + 0.3V); limits fault current to <2mA beyond rail limits. |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure at 100Hz intervals. IC Role / Device Role / Timing Role: Primary ADC capturing conditioned analog outputs from precision transducers; internal reference ensures consistent scaling across operating temperature. Use Value: 400ksps capability allows oversampling for noise reduction; 2.5mA active current extends battery life to >1 year on two AA cells. |
Use Scenario: Portable ECG front-end digitizing biopotential signals with DC-coupled amplification. IC Role / Device Role / Timing Role: High-linearity 12-bit digitizer interfacing directly to instrumentation amplifier output; unipolar transfer function simplifies baseline alignment. Use Value: ±1LSB INL preserves diagnostic waveform fidelity; 6MHz full-power bandwidth captures QRS complex rise times accurately. |
| Battery-Powered Instruments | Process Control Sensors |
Use Scenario: Handheld multimeter measuring AC/DC voltage, current, and resistance with auto-ranging. IC Role / Device Role / Timing Role: Main system ADC handling multiplexed inputs; internal reference provides stable full-scale definition independent of supply variation. Use Value: Single 5V supply simplifies power architecture; shutdown mode cuts quiescent current to µA-level during display-only states. |
Use Scenario: Industrial 4–20mA loop-powered transmitter monitoring tank level via pressure sensor. IC Role / Device Role / Timing Role: Signal conditioning ADC converting ratiometric bridge output; REF pin supplies excitation reference to sensor bridge. Use Value: Internal 2.5V reference eliminates separate DAC/reference IC; 8-pin SO footprint minimizes PCB area in compact loop-powered modules. |
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 |
|---|---|---|---|
| MAX1240BCPA+ | Slower 133ksps sampling rate; ±2LSB INL/DNL; same 8-pin DIP/SO package; no internal reference (requires external 2.5V ref). | Lower-cost option where speed and linearity requirements are relaxed; suitable for slow-scan industrial monitoring. | Select MAX1240BCPA+ only if system design tolerates longer conversion time and external reference sourcing. |
| ADS7822U | TI 12-bit SAR ADC; 200ksps; +2.7V to +5.25V supply; internal reference; SPI-compatible but requires separate VREFIN pin (not buffered output). | Compatible with mixed-voltage systems (e.g., 3.3V µC + 5V analog section); lacks REF output drive capability for external circuitry. | Choose ADS7822U when interfacing to 3.3V controllers and internal reference sufficiency is confirmed; avoid if REF must power external components. |
Compared with MAX1284BCSA+, MAX1240BCPA+ trades speed and linearity for lower cost and legacy compatibility, while ADS7822U offers broader supply flexibility but removes the buffered reference output - making MAX1284BCSA+ uniquely suited for self-contained, space-limited 5V systems requiring both precision and peripheral reference sourcing.
Availability
MAX1284BCSA+ 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 MAX1284BCSA+ 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, high-speed serial ADCs with integrated references - engineered specifically for compact, battery-sensitive systems where board space, power budget, and calibration simplicity are critical.
FAQ
What is the maximum sampling rate supported by the MAX1284BCSA+?
The MAX1284BCSA+ supports a maximum sampling rate of 400ksps, achieved with a 6.4MHz serial clock and 16-clock conversion cycle. This rate is guaranteed over the full 0°C to +70°C operating temperature range and enables full-linear bandwidth up to 350kHz (SINAD > 68dB). Conversion time is fixed at 2.5µs per sample, independent of input signal amplitude.
Does the MAX1284BCSA+ require an external reference voltage?
No, the MAX1284BCSA+ does not require an external reference voltage. It integrates a factory-trimmed +2.5V reference (2.48V to 2.52V, ±15ppm/°C) accessible at the REF pin. This internal reference drives both the ADC core and can be used to bias external circuitry - provided it is bypassed with a minimum 4.7µF capacitor as specified in the MAX1284BCSA+ datasheet.
What digital interfaces are compatible with the MAX1284BCSA+?
The MAX1284BCSA+ supports SPI, QSPI, and MICROWIRE 3-wire serial protocols natively. It requires only SCLK, CS, and DOUT connections - no additional logic or level translation. Configuration uses CPOL = 0 and CPHA = 0 for SPI/MICROWIRE, or CPOL = 0 and CPHA = 1 for QSPI. All timing parameters (e.g., tDOV = 80ns, tCSS = 35ns) are fully characterized in the MAX1284BCSA+ datasheet.
How does the shutdown mode affect power consumption of the MAX1284BCSA+?
In shutdown mode (SHDN = GND), the MAX1284BCSA+ reduces supply current to 2µA typical (≤10µA max), disabling the internal reference, T/H, and digital interface. Wake-up time depends on the 4.7µF REF bypass capacitor discharge duration - up to 2ms after SHDN deassertion. During active operation at 400ksps, IDD is 2.5mA typical (4.0mA max) at VDD = +5.5V.
What is the analog input voltage range of the MAX1284BCSA+?
The MAX1284BCSA+ accepts an analog input voltage range of 0V to +2.5V (unipolar), referenced directly to its internal 2.5V reference. Input protection diodes allow safe overvoltage tolerance from (GND − 0.3V) to (VDD + 0.3V), but accurate conversion is guaranteed only within the 0–2.5V span. Input capacitance is 18pF, and source impedance should be ≤2kΩ to maintain full AC performance.
MAX1284BCSA+ 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:
- Active
- Number of Bits:
- 12
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1284BCSA+ FAQ
1.How can I place an order for MAX1284BCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1284BCSA+ 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 MAX1284BCSA+ reliable?
The price and inventory of MAX1284BCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1284BCSA+ is usually 5 days.
3.What payment methods are accepted for MAX1284BCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1284BCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1284BCSA+?
MAX1284BCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1284BCSA+ 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 MAX1284BCSA+?
For technical support, including MAX1284BCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1284BCSA+ requirements.
6.How does Aetrix verify that MAX1284BCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX1284BCSA+ 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 MAX1284BCSA+ meets industry standards.
7.What is the process for return or replacement of MAX1284BCSA+?
All MAX1284BCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1284BCSA+, 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 MAX1284BCSA+ part is unused and in its original packaging.
Return procedure for MAX1284BCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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