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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:3,472
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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, 4-wire SPI/QSPI/MICROWIRE-compatible interface, internal 2.5V reference, and software-configurable unipolar/bipolar and single-ended/differential inputs. It operates from a single +2.7V to +5.25V supply, draws 1.2mA at 133ksps (+3V), and achieves ±1 LSB INL over 0°C to +70°C - enabling precision data acquisition in portable medical instruments and battery-powered sensor nodes.
For engineers reviewing the MAX1248BCEE datasheet, MAX1248BCEE pinout, MAX1248BCEE application, or MAX1248BCEE equivalent, this page delivers verified electrical specs, QSOP-16 terminal mapping, real-world use cases in system supervision and pen digitizers, and two validated alternative ADCs with documented functional and packaging differences.
Technical Context
The MAX1248BCEE employs successive-approximation architecture with an internal track/hold circuit acquiring input signals in ≤1.5µs. Its analog front-end supports four single-ended or two pseudo-differential input pairs (CH0/CH1, CH2/CH3), with COM pin establishing zero-code reference in single-ended mode and common-mode bias in differential mode.
It features dual clock modes: external SCLK-driven conversion (2MHz max, 15 clocks/conversion) or internal clock operation (2.25MHz small-signal bandwidth, 7.5µs max conversion time). The SHDN pin provides three-level control - low for full shutdown (1µA), high for internal compensation, and floating for external compensation - while REFADJ enables ±1.5% adjustment of the 2.5V internal reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes for medium-precision measurement applications. |
| Conversion Rate | 133ksps - supports real-time sampling of audio-band and control-loop signals without undersampling artifacts. |
| INL (Integral Nonlinearity) | ±1 LSB - ensures monotonicity and <0.1% full-scale error after calibration, critical for closed-loop feedback accuracy. |
| Supply Current | 1.2mA at 133ksps (+3V) - enables extended runtime in coin-cell–powered data loggers. |
| Reference | Internal 2.500V ±0.3% (TA = +25°C), ±30ppm/°C TC - eliminates external reference component count and layout area. |
| Input Configuration | Software-selectable unipolar (0V to VREF) or bipolar (±VREF/2) with single-ended/differential mode - simplifies signal conditioning across diverse sensor types. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded systems including industrial HMI and portable diagnostics. |
Pinout & Package
MAX1248BCEE is housed in a 16-pin QSOP package (5.3mm × 10.2mm footprint, same board area as 8-pin SO), optimized for space-constrained PCB layouts in handheld instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections; bypass with 0.1µF to AGND/DGND. |
| CH0–CH3 (Pins 2–5) | Analog input channels | Four single-ended inputs or two differential pairs (CH0/CH1, CH2/CH3); protected to AGND −0.3V / VDD +0.3V. |
| COM (Pin 6) | Analog ground reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5LSB during conversion. |
| SHDN (Pin 7) | Three-state shutdown control | Low = full power-down (1µA); high = internal compensation; float = external compensation mode. |
| VREF (Pin 8) | Reference buffer output | 2.500V nominal output (MAX1248 only); requires 4.7µF capacitor for internal compensation stability. |
| REFADJ (Pin 9) | Reference buffer adjust input | Enables ±1.5% VREF tuning; tie to VDD to disable internal reference buffer (for MAX1249 compatibility). |
| AGND (Pin 10) | Analog ground return | Separate from DGND; connects to low-noise analog ground plane to minimize coupling into T/H node. |
| DOUT (Pin 12) | Serial data output | MSB-first, clocked on SCLK falling edge; high-impedance when CS = high. |
| DGND (Pin 11) | Digital ground return | Isolated from AGND to prevent digital switching noise from modulating analog conversion. |
| DIN (Pin 14) | Serial data input | Accepts 8-bit control byte (START, SEL2–SEL0, UNI/BIP, SGL/DIF, PD1/PD0); latched on SCLK rising edge. |
| SCLK (Pin 16) | Serial clock input | Drives data transfer and (in external mode) conversion timing; 40–60% duty cycle required. |
| CS (Pin 15) | Chip select (active-low) | Enables serial interface; DOUT goes high-Z when CS = high; no conversion initiated by CS edge alone. |
| SSTRB (Pin 13) | Serial strobe output | Indicates conversion start/end: low during conversion (internal mode) or one-clock pulse before MSB (external mode). |
Key Features
| Feature | Design Value |
|---|---|
| 4-wire SPI/QSPI/MICROWIRE interface | Direct connection to microcontrollers without level shifters or glue logic - reduces BOM and routing complexity. |
| Internal 2.5V reference with REFADJ | ±1.5% programmable adjustment eliminates need for external trimming components in field-deployed sensors. |
| 1.5µs track/hold acquisition time | Supports accurate sampling of signals from sources up to 3kΩ impedance without external RC filtering. |
| Three-level SHDN control | Enables dynamic power management: full shutdown (1µA), fast shutdown (70µA), or operational standby - extends battery life. |
| QSOP-16 package | Same PCB footprint as 8-pin SO - allows drop-in upgrade from legacy 8-pin ADCs while adding 4-channel capability. |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 10ksps intervals over 72-hour deployment. IC Role / Device Role / Timing Role: ADC front-end converting conditioned analog sensor outputs to 10-bit digital words synchronized to µC's SPI master clock. Use Value: 1.2mA active current and 1µA shutdown draw extend CR2032 battery life beyond 12 months; internal reference removes calibration drift risk. |
Use Scenario: Handheld ECG monitor capturing lead-II differential signals with 10-bit resolution and real-time waveform display. IC Role / Device Role / Timing Role: Pseudo-differential ADC sampling CH0/CH1 pair at 1ksps, using COM as bias reference and internal 2.5V reference for rail-to-rail dynamic range. Use Value: ±1 LSB INL ensures diagnostic-grade amplitude fidelity; QSOP-16 footprint fits compact 4-layer flex-rigid PCB. |
| Battery-Powered Instruments | System Supervision |
Use Scenario: Portable multimeter measuring DC voltage (0–20V), current (0–200mA), and resistance (0–2MΩ) with auto-ranging and LCD display. IC Role / Device Role / Timing Role: Configurable ADC accepting unipolar (voltage) or bipolar (current shunt) inputs via software-controlled SGL/DIF and UNI/BIP bits. Use Value: Single-supply +3V operation eliminates dual-rail requirement; 54µA at 1ksps enables >100hr continuous use on AA cells. |
Use Scenario: Industrial PLC module monitoring 4 analog inputs (supply rails, thermal sensors, current sense) for fault detection and logging. IC Role / Device Role / Timing Role: System supervisor ADC multiplexing CH0–CH3 to sample multiple voltage rails sequentially every 100ms. Use Value: Internal reference stability (±30ppm/°C) ensures consistent threshold detection across operating temperature; SHDN pin enables periodic wake-up sampling. |
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 | No internal reference; requires external 2.5V reference at VREF pin; REFADJ disabled when tied to VDD. | Suitable where system already provides a precision external reference (e.g., bandgap or DAC output) and board space allows extra decoupling. | Select MAX1249BCEE if reference sharing across multiple ICs reduces total BOM cost and improves system-level matching. |
| ADS7822U | 12-bit resolution, 200ksps, SPI-only interface, no internal reference, 8-pin SOIC package. | Higher resolution for precision thermocouple or strain gauge measurements; lacks bipolar mode and SHDN flexibility. | Choose ADS7822U when 12-bit accuracy outweighs missing features, and existing 8-pin SOIC layout can accommodate higher pin density. |
Compared with MAX1248BCEE, MAX1249BCEE removes internal reference overhead but adds external component dependency, while ADS7822U trades configurability and power management for higher resolution and simpler interface - making each optimal for distinct trade-off priorities in size, accuracy, and system integration.
Availability
MAX1248BCEE is available at Aetrix Electronics and suitable for portable data logging, medical instruments, and battery-powered instruments requiring stable component supply, long-term lifecycle support, and guaranteed commercial-temperature performance.
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) designs precision analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX1248/MAX1249 product line targets low-power, multi-channel data acquisition in space- and energy-constrained systems - emphasizing integrated references, flexible input configurations, and minimal external component count.
FAQ
What is the maximum sampling rate supported by the MAX1248BCEE?
The MAX1248BCEE achieves a maximum conversion rate of 133ksps when using a 2.0MHz external serial clock and 15 clock cycles per conversion. At lower clock frequencies or in internal clock mode, the effective sampling rate decreases - for example, to 1ksps at 54µA supply current. This makes the MAX1248BCEE suitable for both high-speed transient capture and ultra-low-power periodic monitoring tasks.
Does the MAX1248BCEE require external passive components for stable operation?
Yes, the MAX1248BCEE requires specific external capacitors: a 4.7µF capacitor at the VREF pin for internal reference stability, a 0.1µF bypass capacitor between VDD and AGND/DGND, and optionally a 0.01µF capacitor at each analog input when source impedance exceeds 3kΩ. These components ensure proper reference regulation, power supply decoupling, and acquisition accuracy - all specified in the MAX1248BCEE datasheet absolute maximum and application sections.
How does the SHDN pin function in the MAX1248BCEE?
The SHDN pin on the MAX1248BCEE provides three distinct operating states: pulled low (full shutdown, 1µA), pulled high (internal compensation mode), or left floating (external compensation mode). Unlike simple on/off control, this three-level interface directly configures the reference-buffer amplifier's compensation network - enabling precise optimization of reference stability versus startup time without firmware intervention.
Can the MAX1248BCEE interface directly with a TMS320 DSP family processor?
Yes, the MAX1248BCEE's serial strobe output (SSTRB) is explicitly designed for direct connection to TMS320-family digital signal processors. In internal clock mode, SSTRB asserts low at conversion start and high at completion - providing hardware-ready signaling that eliminates polling overhead and synchronizes DMA transfers with conversion readiness.
What is the input voltage range specification for the MAX1248BCEE in unipolar mode?
In unipolar mode, the MAX1248BCEE accepts analog input voltages from 0V to VREF (2.500V nominal), referenced to the COM pin. The device guarantees full-scale performance only when inputs remain within AGND −50mV to VDD +50mV - exceeding this range risks forward-biasing internal protection diodes and introducing gain/offset errors. For robust design, limit inputs to 0V–2.5V with COM = 0V.
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:
- 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, 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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