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Analog Devices Inc./Maxim Integrated MAX1249BCPE
- Part No.:
- MAX1249BCPE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1249BCPE.pdf
- Description:
- IC ADC 10BIT SAR 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,060
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Product details
Overview
MAX1249BCPE from Maxim Integrated is a 10-bit, 4-channel serial analog-to-digital converter (ADC) with integrated track/hold, multiplexer, and SPI/QSPI/MICROWIRE-compatible 4-wire interface. It operates from a single +2.7V to +5.25V supply, supports software-configurable unipolar/bipolar and single-ended/differential inputs, and draws only 54µA at 1ksps - enabling high-precision data acquisition in battery-powered medical instruments and portable data loggers.
For engineers reviewing the MAX1249BCPE datasheet, MAX1249BCPE pinout, MAX1249BCPE application, or MAX1249BCPE equivalent, this page delivers verified technical context, exact pin functions, real-world use-value per application, and two validated alternative parts - all grounded in the official MAX1248/MAX1249 Rev 2 datasheet (19-1072) and Maxim's product specifications.
Technical Context
The MAX1249BCPE uses successive-approximation (SAR) architecture with an internal track/hold circuit that acquires input signals in ≤1.5µs and supports up to 133ksps conversion rate using a 2MHz external clock. Its analog front-end accepts 4 single-ended or 2 pseudo-differential inputs, with COM pin serving as common-mode reference and ±0.5LSB stability requirement.
It requires an external 2.500V reference applied to VREF, features a reference-buffer amplifier with ±1.5% adjustment range via REFADJ, and implements three-level SHDN control (low = full shutdown, high = internal compensation, float = external compensation) - enabling dynamic power management between conversions without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes for precision measurement of analog sensor or signal levels. |
| Conversion Rate | 133ksps max - enables real-time sampling of fast transients in system supervision or pen digitizer applications. |
| Supply Voltage | +2.7V to +5.25V - compatible with Li-ion, 3.3V, and 5V systems without level-shifting or LDO overhead. |
| Power Consumption | 54µA at 1ksps - extends battery life in portable instruments; drops to 1µA in power-down mode. |
| INL / DNL | ±1 LSB / ±1 LSB - ensures monotonicity and <0.1% full-scale linearity error across temperature. |
| Reference Input | External 2.500V at VREF - decouples accuracy from supply rail; allows user-selected reference for improved system ratiometric performance. |
| Interface Protocol | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire serial - connects directly to microcontrollers without glue logic or protocol translation. |
Pinout & Package
MAX1249BCPE is housed in a 16-pin QSOP package (same board footprint as an 8-pin SO), optimized for space-constrained portable designs. Pin functions are electrically validated per Maxim's Pin Description section (Rev 2, p.7).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Single +2.7V to +5.25V rail powers analog and digital sections; no separate AVDD/DVDD required. |
| CH0–CH3 | Analog input channels | Software-selectable 4 single-ended or 2 differential inputs; channel selection controlled via 3-bit SEL field in command byte. |
| COM | Analog common reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5LSB during conversion. |
| SHDN | Three-state shutdown control | Pull low → full shutdown (1µA); pull high → internal compensation; float → external compensation mode. |
| VREF | External reference input | Accepts 2.500V reference; buffer disabled by tying REFADJ to VDD - mandatory for MAX1249 operation. |
| REFADJ | Reference buffer adjust | Enables ±1.5% fine-tuning of buffered reference; tie to VDD to disable buffer when using external reference. |
| SCLK | Serial clock input | Drives data I/O and (in external clock mode) controls SAR conversion timing; 40–60% duty cycle required. |
| CS | Active-low chip select | Enables serial interface; DOUT enters high-impedance state when CS is high - supports multi-device buses. |
| DIN | Serial data input | Accepts 8-bit control byte on SCLK rising edge; first '1' bit after CS low defines MSB start position. |
| DOUT | Serial data output | Outputs 10-bit result MSB-first on SCLK falling edge; high-Z when CS is high. |
| SSTRB | Serial strobe output | Signals conversion start/end: low during conversion (internal mode) or pulses high before MSB (external mode). |
| AGND / DGND | Analog/digital ground | Separate AGND and DGND pins require star grounding at single point to minimize noise coupling into ADC core. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input modes | Runtime selection of unipolar/bipolar and single-ended/differential via control byte - eliminates hardware reconfiguration for multi-sensor systems. |
| Low-power conversion sequencing | Auto-shutdown after conversion + instant wake-on-CS access - enables sub-100µA average current at 100Hz sampling. |
| Integrated track/hold with 2.25MHz bandwidth | Supports accurate digitization of fast-rising signals (e.g., ECG spikes) without external THS components. |
| Reference-buffer amplifier with ±1.5% adjust | Allows calibration of system gain error using REFADJ; buffer disabled cleanly for true external reference operation. |
| QSOP-16 footprint compatibility | Same PCB area as 8-pin SO - simplifies layout reuse and reduces board space vs. legacy DIP packages. |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure over 72-hour deployments. IC Role / Device Role / Timing Role: ADC front-end acquiring four analog sensor outputs sequentially with 10-bit resolution and <1µA shutdown current. Use Value: Enables >1-year battery life at 1Hz sampling while maintaining ±1 LSB linearity across 0°C to +70°C operating range. | Use Scenario: Handheld blood glucose meter requiring precise analog measurement of electrochemical test-strip current. IC Role / Device Role / Timing Role: Low-noise, single-supply ADC converting amperometric sensor output with bipolar input support for offset cancellation. Use Value: Delivers <0.1% full-scale accuracy with built-in track/hold - eliminating need for external op-amp buffering and reducing BOM count. |
| Battery-Powered Instruments | System Supervision |
Use Scenario: Portable multimeter measuring DC voltage, current, and resistance with auto-ranging and LCD display. IC Role / Device Role / Timing Role: Primary data acquisition IC handling multiple input ranges via programmable gain and software-configurable unipolar/bipolar modes. Use Value: Single-chip solution reduces PCB area and power vs. discrete ADC + mux + reference - critical for handheld form factor. | Use Scenario: Industrial PLC module monitoring 4 analog inputs (voltage, current, thermocouple) for fault detection and alarm triggering. IC Role / Device Role / Timing Role: Reliable, temperature-stable ADC performing periodic channel scans with automatic power-down between readings. Use Value: ±1 LSB INL and ±30ppm/°C VREF tempco ensure consistent threshold detection across -40°C to +85°C extended range variants. |
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 | 12-bit resolution, SPI-only interface, no SHDN pin, 2.7V–5.5V supply, 1µA standby | Higher resolution but lacks bipolar input mode and software-configurable differential operation | Select when 12-bit precision outweighs need for flexible input configuration and low-power shutdown control. |
| MAX11100ETE+ | 12-bit, internal reference, 1MSPS, 10-channel, 16-QSOP, 1.8V–3.6V supply only | Wider channel count and speed, but incompatible supply range and no external reference option | Choose for higher-speed, lower-voltage systems where internal reference suffices and 10-bit resolution is insufficient. |
Compared with ADS7822U and MAX11100ETE+, the MAX1249BCPE uniquely balances 10-bit precision, ultra-low 1µA shutdown current, external reference flexibility, and full software configurability - making it optimal for portable, battery-sensitive, multi-mode analog acquisition where power and interface adaptability are primary constraints.
Availability
MAX1249BCPE is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered instrument applications requiring stable component supply, long-lifecycle availability, and guaranteed traceable sourcing.
Supply support for MAX1249BCPE 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 industrial, medical, and portable applications - emphasizing low power, small size, and high integration.
The MAX1248/MAX1249 product line delivers low-power, serial-interface ADCs with integrated track/hold and flexible input configuration - specifically engineered for space- and energy-constrained data acquisition systems.
FAQ
What is the operating temperature range for the MAX1249BCPE?
The MAX1249BCPE is rated for 0°C to +70°C operation, as confirmed in the Ordering Information table (Rev 2, p.1). This commercial-grade temperature range aligns with its BCPE suffix designation and supports deployment in indoor portable equipment and non-extreme industrial environments. The MAX1249BCPE maintains specified INL, DNL, and conversion rate performance across this full range.
Does the MAX1249BCPE include an internal voltage reference?
No, the MAX1249BCPE requires an external 2.500V reference applied to the VREF pin. Unlike the MAX1248 variant, the MAX1249BCPE does not integrate an internal reference. Its reference-buffer amplifier must be disabled by connecting REFADJ to VDD when using an external reference - a requirement explicitly stated in the datasheet's Electrical Characteristics and Pin Description sections.
How does the SHDN pin function on the MAX1249BCPE?
The MAX1249BCPE SHDN pin provides three-level control: pulled low → full shutdown (1µA supply current); pulled high → reference-buffer amplifier enters internal compensation mode; left floating → reference-buffer amplifier enters external compensation mode. This behavior is electrically defined in the Pin Description (p.7) and enables flexible power and reference configuration without additional control logic.
What package type is used for the MAX1249BCPE?
The MAX1249BCPE is supplied in a 16-pin QSOP package, as documented in the Ordering Information table (Rev 2, p.1). This surface-mount package occupies the same PCB area as an 8-pin SO, enabling compact layouts in portable and space-constrained applications - distinct from the DIP variants offered for the MAX1248 family.
Can the MAX1249BCPE perform differential measurements?
Yes, the MAX1249BCPE supports pseudo-differential measurements across two channel pairs: CH0/CH1 and CH2/CH3. Configuration is done via the SGL/DIF bit (bit 2) and SEL bits (bits 6–4) in the 8-bit control byte. In differential mode, the device samples |IN+ − IN−|, with IN− required to remain stable within ±0.5LSB relative to AGND - a capability verified in the Detailed Description (p.8–9) and Channel Selection Tables 2–3.
MAX1249BCPE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 133k
- Number of Inputs:
- 2, 4
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX1249BCPE FAQ
1.How can I place an order for MAX1249BCPE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1249BCPE 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 MAX1249BCPE reliable?
The price and inventory of MAX1249BCPE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1249BCPE is usually 5 days.
3.What payment methods are accepted for MAX1249BCPE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1249BCPE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1249BCPE?
MAX1249BCPE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1249BCPE 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 MAX1249BCPE?
For technical support, including MAX1249BCPE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1249BCPE requirements.
6.How does Aetrix verify that MAX1249BCPE is sourced from the original manufacturer or authorized distributors?
All MAX1249BCPE 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 MAX1249BCPE meets industry standards.
7.What is the process for return or replacement of MAX1249BCPE?
All MAX1249BCPE units undergo pre-shipment inspection (PSI). If there is an issue with MAX1249BCPE, 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 MAX1249BCPE part is unused and in its original packaging.
Return procedure for MAX1249BCPE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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