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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:994
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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 achieves 133ksps conversion rate using an external 2MHz clock. It targets portable data logging and battery-powered instrumentation where low power and compact size are critical.
For engineers reviewing the MAX1249BCPE+ datasheet, MAX1249BCPE+ pinout, MAX1249BCPE+ application, or MAX1249BCPE+ equivalent, this page delivers verified electrical specs, package mapping, functional role in signal acquisition chains, and real-world selection guidance - all grounded in the official MAX1248/MAX1249 Rev 2 datasheet (19-1072) and Maxim's product documentation.
Technical Context
The MAX1249BCPE+ uses successive-approximation architecture with an internal track/hold circuit that acquires input signals within 1.5µs minimum, supporting both internal and external clock modes. Its analog front-end accepts up to four single-ended or two pseudo-differential inputs, with COM pin defining zero-code reference and configurable input ranges (0V to VREF or ±VREF/2).
Digital control is implemented via an 8-bit command byte specifying channel selection (CH0–CH3), unipolar/bipolar mode, single-ended/differential mode, and power-down/clock configuration. The device features a hard-wired SHDN pin for three-level shutdown control and a reference-buffer amplifier at REFADJ with ±1.5% adjustment range - though unlike the MAX1248, it requires an external 2.500V reference applied to VREF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes with monotonic transfer function and no missing codes over temperature. |
| Conversion Rate | 133ksps - achievable with 2MHz external clock and 15-clock cycle timing; supports high-speed sampling in portable instruments. |
| Analog Input Range | 0V to VREF (unipolar) or ±VREF/2 (bipolar) - enables flexible sensor interfacing without external level-shifting circuitry. |
| Supply Current | 1.2mA at 133ksps / +3V - enables extended battery life in handheld medical or data-logging devices. |
| Power-Down Current | 1µA - allows deep sleep between conversions to reduce average system power in intermittent-sampling applications. |
| INL (Integral Nonlinearity) | ±1 LSB - ensures accurate end-point calibration and minimal code-dependent measurement error across full scale. |
| Reference Requirement | External 2.500V reference at VREF pin - decouples accuracy from internal reference drift; supports precision external references like MAX6126. |
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 validated per Maxim's Pin Description table (Rev 2, p.7) and match the MAX1248/MAX1249 family layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections; must be bypassed with 0.1µF capacitor to AGND. |
| CH0–CH3 | Analog input channels | Four single-ended inputs; configurable as two differential pairs (CH0/CH1, CH2/CH3); each has ±0.3V absolute max rating beyond supplies. |
| COM | Analog common reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5LSB during conversion. |
| SHDN | Three-level shutdown control | Low = full shutdown; high = internal compensation mode; float = external compensation mode - configures reference buffer behavior. |
| VREF | External reference input | 2.500V reference voltage applied externally; disables internal buffer when REFADJ is tied to VDD. |
| REFADJ | Reference buffer adjust input | Enables ±1.5% fine-tuning of reference gain; ±10µA input current; bypass with 0.01µF to AGND. |
| 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 goes high-Z when CS is high; required to initiate command byte transfer. |
| DIN | Serial data input | Receives 8-bit control byte on SCLK rising edge; first logic "1" after CS fall defines MSB. |
| DOUT | Serial data output | Outputs 10-bit result MSB-first on SCLK falling edge; high-Z when CS is high (external clock mode). |
| SSTRB | Serial strobe output | Pulses high before MSB decision (external mode) or asserts low during conversion (internal mode); synchronizes DSP read timing. |
| AGND / DGND | Analog / digital ground | Separate ground pins minimize noise coupling; must be connected at single point near device. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (4-channel) or pseudo-differential (2-channel) operation selected via control byte - eliminates need for external multiplexers or op-amp front-ends. |
| Low-power adaptive shutdown | Auto-shutdown at conversion end + wake-on-CS access reduces average current to <60µA at reduced sampling rates - extends battery runtime in field-deployed sensors. |
| SPI/QSPI/MICROWIRE/TMS320 compatibility | No external logic required for interface - direct connection to microcontrollers (e.g., STM32, TMS320C2000) simplifies PCB routing and firmware integration. |
| Flexible reference architecture | External reference input with ±1.5% REFADJ adjustment enables use of ultra-stable references (e.g., MAX6126AASA+) for <±0.1% total system accuracy. |
| QSOP-16 footprint | Same board area as 8-pin SO - allows high-density layout in handheld medical devices without sacrificing thermal or electrical performance. |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over 72-hour deployments. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog outputs from MEMS sensors; internal track/hold captures fast transients during wake-up bursts. Use Value: 1.2mA active current and 1µA shutdown enable >1-year battery life at 10s sampling intervals; QSOP-16 saves PCB area for multi-sensor integration. |
Use Scenario: Handheld ECG monitor acquiring lead-II differential signals with 10-bit resolution and clinical-grade linearity. IC Role / Device Role / Timing Role: Configured in differential mode (CH0/CH1) with bipolar ±1.25V range; COM referenced to mid-supply for DC-coupled biopotential inputs. Use Value: ±1 LSB INL and ±1 LSB DNL ensure diagnostic waveform fidelity; external reference support enables traceable calibration against NIST standards. |
| 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: Front-end ADC for precision analog measurements; software-selectable unipolar/bipolar mode adapts to different test signal polarities. Use Value: Single +3V supply simplifies power design; 133ksps rate supports fast continuity testing and AC ripple analysis up to 65kHz bandwidth. |
Use Scenario: Industrial PLC module monitoring rail voltages, temperature, and fan tachometer signals across multiple subsystems. IC Role / Device Role / Timing Role: Multi-channel acquisition engine scanning 4 analog points per cycle; SHDN pin synchronized to CPU sleep states. Use Value: 4-channel mux + track/hold eliminates need for external sample-hold ICs; 16-pin QSOP fits tight I/O module spacing while maintaining isolation between analog and digital domains. |
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 |
|---|---|---|---|
| MAX1248BCPE+ | Includes internal 2.5V reference; same pinout, timing, and interface; ±1.5% REFADJ range identical. | Preferred when reference stability requirements allow internal source; eliminates external reference component and associated layout complexity. | Select MAX1248BCPE+ if system cost and BOM count are prioritized over reference flexibility; verify internal reference tempco (±30ppm/°C) meets accuracy budget. |
| ADS7822U | 12-bit resolution, 200ksps, SPI-only interface; no SHDN pin; requires external reference; 8-pin SOIC package. | Better resolution/speed but lacks differential mode, programmable shutdown, and REFADJ adjustment; smaller package limits thermal dissipation. | Choose ADS7822U only if 12-bit precision is mandatory and differential input is unnecessary; confirm 8-pin SOIC thermal derating suffices for continuous 200ksps operation. |
Compared with MAX1248BCPE+, the MAX1249BCPE+ trades internal reference convenience for external reference flexibility and tighter reference sourcing control; versus ADS7822U, it offers differential input capability, lower power in shutdown, and finer reference tuning - making it superior for portable, multi-sensor, battery-sensitive systems requiring calibrated bipolar measurements.
Availability
MAX1249BCPE+ is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, 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) is a fabless semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications markets.
The MAX1248/MAX1249 product line was designed for low-power, multi-channel data acquisition in space- and energy-constrained portable systems - emphasizing integrated functionality, flexible reference architecture, and direct microcontroller interoperability.
FAQ
What is the operating temperature range for MAX1249BCPE+?
The MAX1249BCPE+ is specified for 0°C to +70°C operation (Commercial grade). This range is confirmed in the Ordering Information table on page 1 of the MAX1248/MAX1249 datasheet (Rev 2), where MAX1249BCPE+ is explicitly listed under the "0°C to +70°C" temperature column. It is not rated for extended industrial (-40°C to +85°C) or military (-55°C to +125°C) ranges.
Does MAX1249BCPE+ include an internal voltage reference?
No, the MAX1249BCPE+ does not include an internal voltage reference. As stated in the General Description, "The MAX1248 has an internal 2.5V reference, while the MAX1249 requires an external reference." The MAX1249BCPE+ must be supplied with a stable 2.500V reference at the VREF pin, and its reference-buffer amplifier is disabled by pulling REFADJ to VDD.
What package type is used for MAX1249BCPE+?
The MAX1249BCPE+ uses a 16-pin QSOP (Quarter-Size Outline Package), as confirmed in the Ordering Information table (page 1) and Pin Configuration section (page 7) of the MAX1248/MAX1249 datasheet. The "E" suffix in the part number denotes QSOP packaging, and the datasheet notes it occupies the same board area as an 8-pin SO.
How does the SHDN pin function on MAX1249BCPE+?
The SHDN pin on MAX1249BCPE+ provides three-level control: pulled low → full shutdown (1µA); pulled high → internal compensation mode for reference buffer; left floating → external compensation mode. This is documented in the Pin Description (page 7) and Detailed Description (page 8), where SHDN directly configures the reference-buffer amplifier's compensation network.
Can MAX1249BCPE+ perform differential measurements?
Yes, MAX1249BCPE+ supports pseudo-differential measurements using CH0/CH1 or CH2/CH3 pairs, as defined in Table 3 of the datasheet. In differential mode, the device samples the voltage difference |IN+ − IN−|, with IN− required to remain stable to ±0.5LSB relative to AGND - achieved by placing a 0.1µF capacitor from the selected IN− channel to AGND.
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:
- Active
- 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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