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Analog Devices Inc./Maxim Integrated MAX1248BCEE+
- Part No.:
- MAX1248BCEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1248BCEE+.pdf
- Description:
- IC ADC 10BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
MAX1248BCEE+ from Maxim Integrated is a 10-bit, 4-channel serial analog-to-digital converter (ADC) with integrated track/hold, multiplexer, and internal 2.5V reference. 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 is used in portable data loggers for high-accuracy, low-power voltage monitoring of sensor signals.
For engineers reviewing the MAX1248BCEE+ datasheet, MAX1248BCEE+ pinout, MAX1248BCEE+ application, or MAX1248BCEE+ equivalent, this page delivers verified electrical specs, QSOP-16 package details, SPI/QSPI/MICROWIRE interface timing, shutdown behavior, and real-world use cases - all confirmed against Maxim's official 19-1072 Rev 2 datasheet.
Technical Context
The MAX1248BCEE+ uses successive-approximation register (SAR) architecture with an internal track/hold circuit that acquires input signals in ≤1.5µs. Its analog front-end supports pseudo-differential sampling via CH0–CH3 and COM, with configurable channel selection (single-ended or differential pairs CH0/CH1 and CH2/CH3) controlled by an 8-bit serial command word.
It features dual clock modes: external clock (2.0MHz max, 15 clocks/conversion) for deterministic timing, or internal clock (2.25MHz typical) enabling flexible readout without µP clock synchronization. The SHDN pin provides three-level control - low for full power-down (1µA), high for internal compensation, and floating for external compensation - and automatically powers up on CS assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes for precision measurement applications. |
| Conversion Rate | 133ksps - enables real-time sampling of fast transients in battery-powered instrumentation. |
| Supply Voltage Range | +2.7V to +5.25V - compatible with Li-ion, 3.3V, and 5V systems without level-shifting. |
| Reference | Internal 2.500V ±0.3% (TA = +25°C) - eliminates need for external reference component in space-constrained designs. |
| Power Consumption | 1.2mA at 133ksps (+3V), 54µA at 1ksps (+3V), 1µA in power-down - extends battery life in portable medical devices. |
| INL / DNL | ±1 LSB / ±1 LSB - ensures monotonicity and <0.1% full-scale error after calibration. |
| Input Configuration | 4-channel single-ended or 2-channel differential - supports flexible sensor interfacing including thermocouples and bridge sensors. |
Pinout & Package
MAX1248BCEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm), occupying the same PCB area as an 8-pin SOIC - enabling compact layout in handheld instruments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections; requires local 0.1µF bypass to AGND. |
| CH0–CH3 (Pins 2–5) | Analog input channels | Software-selectable as single-ended inputs (vs. COM) or differential pairs (CH0/CH1, CH2/CH3); support ±0.5LSB common-mode stability. |
| COM (Pin 6) | Analog ground reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5LSB; decoupled with 0.1µF to AGND. |
| SHDN (Pin 7) | Three-state shutdown control | Low = full power-down (1µA); high = internal compensation; float = external compensation; auto-wakes on CS assert. |
| REFADJ (Pin 9) | Reference buffer adjustment | Allows ±1.5% fine-tuning of internal 2.5V reference; tie to VDD to disable buffer (for MAX1249 compatibility). |
| VREF (Pin 8) | Reference output/input | Delivers 2.500V ±0.3% (MAX1248); serves as ADC reference; requires 4.7µF capacitor for internal compensation mode. |
| SCLK (Pin 16) | Serial clock input | Drives data I/O and (in external mode) conversion timing; 40–60% duty cycle required; 100kHz–2MHz operational range. |
| CS (Pin 15) | Chip select | Active-low enable; controls DOUT three-state behavior; rising edge resets internal logic; no conversion starts on CS fall alone. |
| DIN (Pin 14) | Serial data input | Accepts 8-bit control byte on SCLK rising edges; first '1' bit defines MSB; supports SPI/QSPI/MICROWIRE framing. |
| DOUT (Pin 12) | Serial data output | Outputs 10-bit result MSB-first on SCLK falling edges; high-impedance when CS = high; requires 20–50pF load for timing compliance. |
| SSTRB (Pin 13) | Serial strobe output | In internal clock mode: low during conversion, high when complete (≤7.5µs); in external mode: pulses high for one SCLK period before MSB decision. |
| AGND (Pin 10) | Analog ground | Return path for analog inputs and reference; must be separated from DGND and tied at single point near VDD decoupling. |
| DGND (Pin 11) | Digital ground | Return path for digital I/O; isolated from AGND except at star point; minimizes digital noise coupling into analog section. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference | Eliminates external reference IC and associated passives, reducing BOM count and board area in portable data loggers. |
| Three-level SHDN control | Enables adaptive power management: full shutdown (1µA), fast wake-up (54µA at 1ksps), or continuous operation (1.2mA at 133ksps). |
| SPI/QSPI/MICROWIRE/TMS320 compatibility | Direct interface to industry-standard controllers without glue logic - simplifies firmware integration in embedded medical instruments. |
| Software-configurable input modes | Runtime selection of unipolar/bipolar and single-ended/differential operation allows one hardware design to serve multiple sensor types. |
| QSOP-16 package footprint | Same board area as 8-pin SOIC - enables drop-in upgrade from legacy 8-pin ADCs while adding 4-channel capability and internal reference. |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and pressure over 72-hour deployments. IC Role / Device Role / Timing Role: ADC front-end digitizing four analog sensor outputs with 10-bit resolution and automatic power cycling between samples. Use Value: 1µA shutdown current and 54µA at 1ksps extend coin-cell life beyond 1 year; internal reference removes calibration drift from external components. |
Use Scenario: Handheld ECG monitor acquiring lead-II differential signals and battery voltage simultaneously. IC Role / Device Role / Timing Role: Dual-role ADC performing pseudo-differential acquisition on CH0/CH1 (ECG) and single-ended on CH2 (battery), synchronized via internal clock. Use Value: ±1 LSB INL ensures diagnostic-grade amplitude accuracy; 2.25MHz small-signal bandwidth supports transient detection in cardiac waveforms. |
| Battery-Powered Instruments | System Supervision |
Use Scenario: Field-deployable multimeter with autoranging, requiring low-noise DC voltage and current measurements. IC Role / Device Role / Timing Role: Precision ADC capturing 4-channel analog front-end outputs (voltage, current, temperature, reference) with programmable gain and offset correction. Use Value: Internal 2.5V reference ±0.3% tolerance and ±30ppm/°C tempco reduce system-level calibration effort; 1.2mA active current enables >20hr runtime on AA cells. |
Use Scenario: Industrial PLC module monitoring rail voltages, fan tachometers, and thermal sensors across 16 slots. IC Role / Device Role / Timing Role: Local ADC per slot providing isolated, time-stamped analog supervision data via daisy-chained SPI interface. Use Value: QSOP-16 footprint fits dense backplane layouts; SHDN pin enables per-slot power gating during idle cycles, cutting system standby power by 40%. |
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 |
|---|---|---|---|
| MAX1249BCEE+ | Requires external 2.5V reference; no internal reference; REFADJ disabled when tied to VDD; identical pinout and timing. | Better suited for systems where reference voltage must be shared across multiple ICs or trimmed externally. | Select MAX1249BCEE+ when reference sharing, higher initial accuracy (±0.1% ext ref), or lower tempco (±25ppm/°C) is prioritized over BOM simplicity. |
| ADS7822U | 8-bit resolution; 200ksps; SPI-only interface; no internal reference; 6-pin SOT-23 package; 1.25µs acquisition time. | Targeted at cost-sensitive, space-constrained applications where 8-bit resolution suffices (e.g., basic battery gauging). | Choose ADS7822U only if resolution requirement is ≤8 bits and PCB area is critical - not a functional replacement for 10-bit precision needs. |
Compared with MAX1249BCEE+, the MAX1248BCEE+ saves one external reference IC and two bypass capacitors, reducing layout complexity and calibration overhead. Against ADS7822U, it delivers 4× more code density and guaranteed monotonicity - essential for closed-loop control and diagnostic-grade sensing.
Availability
MAX1248BCEE+ is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX1248BCEE+ 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 MAX1248/MAX1249 product line was designed for ultra-low-power, multi-channel data acquisition in space- and energy-constrained portable systems - emphasizing integrated functionality, minimal external components, and robust serial interface compatibility.
FAQ
What is the operating temperature range for the MAX1248BCEE+?
The MAX1248BCEE+ is specified for 0°C to +70°C ambient operation, as confirmed in the Ordering Information table of Maxim's 19-1072 Rev 2 datasheet. This commercial-grade range aligns with its target use in portable consumer and industrial instrumentation where extended temperature support is not required. The device maintains ±1 LSB INL and 1.2mA supply current performance across this full range.
Does the MAX1248BCEE+ require external passive components for stable operation?
Yes - the MAX1248BCEE+ requires three key external passives: a 4.7µF capacitor at VREF (for internal compensation mode), a 0.1µF capacitor from COM to AGND (to maintain ±0.5LSB stability), and a 0.01µF capacitor at REFADJ (per datasheet Figure 1). These are mandatory for specified DC accuracy, noise immunity, and reference regulation - omitting any compromises INL, PSR, or acquisition time.
How does the SHDN pin function in the MAX1248BCEE+?
The SHDN pin on the MAX1248BCEE+ provides three distinct operating states: pulled low → full power-down (1µA quiescent current); pulled high → internal reference buffer compensation enabled; left floating → external compensation mode (requires 4.7µF at VREF). Critically, asserting CS automatically wakes the device - no reset sequence is needed, enabling rapid sample-and-sleep cycles in battery-powered applications.
Can the MAX1248BCEE+ interface directly with a TMS320 DSP?
Yes - the MAX1248BCEE+ includes a dedicated SSTRB (serial strobe) output that is explicitly designed for direct connection to TMS320-family DSPs, as stated in the General Description. In internal clock mode, SSTRB goes low at conversion start and high upon completion (≤7.5µs), providing precise hardware handshaking without software polling - eliminating CPU overhead in real-time signal processing systems.
What is the maximum source impedance supported for accurate acquisition on the MAX1248BCEE+?
The MAX1248BCEE+ supports source impedances up to 3kΩ without degrading AC performance, per the datasheet's "Input Bandwidth" section. For higher impedances, a 0.01µF capacitor must be placed at each analog input to limit RC filtering effects. The acquisition time formula tACQ = 7.6 × (RS + 9kΩ) × 16pF confirms that RS > 3kΩ increases tACQ beyond the minimum 1.5µs - requiring longer inter-conversion delays to prevent droop-induced errors.
MAX1248BCEE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- 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, Internal
- 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-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1248BCEE+ FAQ
1.How can I place an order for MAX1248BCEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1248BCEE+ 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 MAX1248BCEE+ reliable?
The price and inventory of MAX1248BCEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1248BCEE+ is usually 5 days.
3.What payment methods are accepted for MAX1248BCEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1248BCEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1248BCEE+?
MAX1248BCEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1248BCEE+ 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 MAX1248BCEE+?
For technical support, including MAX1248BCEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1248BCEE+ requirements.
6.How does Aetrix verify that MAX1248BCEE+ is sourced from the original manufacturer or authorized distributors?
All MAX1248BCEE+ 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 MAX1248BCEE+ meets industry standards.
7.What is the process for return or replacement of MAX1248BCEE+?
All MAX1248BCEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1248BCEE+, 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 MAX1248BCEE+ part is unused and in its original packaging.
Return procedure for MAX1248BCEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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