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Analog Devices Inc./Maxim Integrated MAX1248AEEE+T
- Part No.:
- MAX1248AEEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1248AEEE+T.pdf
- Description:
- IC ADC 10BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,685
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Product details
Overview
MAX1248AEEE+T 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 +2.7V to +5.25V, draws 1.2mA at 133ksps (+3V), and supports portable data logging and battery-powered instrumentation.
For engineers reviewing the MAX1248AEEE+T datasheet, MAX1248AEEE+T pinout, MAX1248AEEE+T application, or MAX1248AEEE+T equivalent, this page delivers verified technical context, real-world timing behavior, power-down sequencing, reference-buffer configuration modes, and validated alternative ADCs for low-power, multi-channel sampling systems.
Technical Context
The MAX1248AEEE+T uses successive-approximation (SAR) architecture with an internal track/hold circuit that acquires input signals in ≤1.5µs and supports both internal clock mode (7.5µs max conversion time) and external clock mode (15 SCLK cycles per conversion). Its analog front-end allows pseudo-differential operation across CH0–CH3 with COM-referenced zero-code alignment.
It implements a three-level SHDN pin controlling shutdown state, reference-buffer compensation mode (internal vs. external), and power-down activation. The VREF output is buffered and adjustable via REFADJ (±1.5% range), while DOUT and SSTRB are three-state outputs synchronized to SCLK falling edges in MSB-first format.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR - delivers 1024 discrete digital codes with no missing codes over temperature. |
| Sampling Rate | 133ksps maximum - enables real-time capture of signals up to 65kHz full-power bandwidth. |
| Reference | Internal 2.500V ±0.3% (25°C), ±30ppm/°C TC - eliminates need for external reference in space-constrained designs. |
| Supply Current | 1.2mA at 133ksps (+3V), 54µA at 1ksps, 1µA in full power-down - supports duty-cycled acquisition in battery systems. |
| INL / DNL | ±0.5 LSB typical INL, ±1 LSB max DNL - ensures monotonicity and <0.05% relative accuracy after calibration. |
| Input Configuration | Software-selectable: 4-channel single-ended or 2-channel differential - simplifies firmware-driven channel routing without hardware changes. |
| Serial Interface | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire protocol - interoperates directly with common microcontrollers without level-shifting or glue logic. |
Pinout & Package
MAX1248AEEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm), occupying the same PCB footprint as an 8-pin SOIC - enabling compact layout in portable instruments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections; decoupling required at AGND/DGND. |
| CH0–CH3 | Analog input channels | Selectable as single-ended (vs. COM) or differential pairs (CH0/CH1, CH2/CH3); protected to ±0.3V beyond rails. |
| COM | Analog ground 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; float = external compensation - configures reference buffer behavior. |
| VREF | Reference buffer output / ADC reference | 2.500V nominal output (MAX1248 only); bypassed with 4.7µF cap in internal mode; disabled when REFADJ = VDD. |
| REFADJ | Reference buffer adjustment input | Enables ±1.5% VREF tuning; input current ±50µA; tie to VDD to disable buffer for external reference use. |
| SCLK | Serial clock input | Drives data I/O and (in external mode) conversion timing; 40–60% duty cycle required; max 2MHz. |
| CS | Active-low chip select | Enables serial interface; DOUT and SSTRB go high-Z when CS = high; defines control byte start bit. |
| DIN | Serial data input | Accepts 8-bit control byte on SCLK rising edge; START bit (first '1') initiates configuration sequence. |
| DOUT | Serial data output | Outputs 10-bit result MSB-first on SCLK falling edge; high-Z when CS = high (external mode) or during conversion (internal mode). |
| SSTRB | Serial strobe output | Pulses high before MSB in external mode; goes low at conversion start and high at completion in internal mode - used for timing synchronization. |
| AGND / DGND | Analog and digital ground | Separate pins minimize noise coupling; must be connected at single point near device; AGND referenced by analog inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference with ±1.5% adjustability | Eliminates external reference IC and reduces BOM count; REFADJ allows fine-tuning for system-level gain calibration. |
| Three-level SHDN pin | Enables hardware-selectable reference buffer compensation (internal/external) and fast/full power-down - avoids software overhead for critical low-power states. |
| 1.5µs minimum acquisition time | Supports high-impedance sensor interfaces up to 3kΩ source impedance without performance degradation; RC filtering optional for >3kΩ sources. |
| 2.25MHz small-signal input bandwidth | Permits undersampling of RF or transient signals above Nyquist rate - useful in spectral analysis and event-triggered capture applications. |
| Software-configurable unipolar/bipolar and SGL/DIF modes | Single firmware image supports diverse sensor types (e.g., thermocouples, strain gauges, battery monitors) without hardware rework. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 1ksps intervals. IC Role / Device Role / Timing Role: 4-channel ADC digitizing multiple analog sensors simultaneously; internal reference ensures consistent scaling across channels without external components. Use Value: 54µA active current at 1ksps extends battery life to >1 year on two AA cells; QSOP-16 footprint minimizes PCB area in handheld enclosures. |
Use Scenario: Portable ECG front-end acquiring lead-II differential signals with baseline drift correction. IC Role / Device Role / Timing Role: Pseudo-differential ADC sampling CH0/CH1 pair; COM referenced to right-leg drive; bipolar mode captures ±1.25V cardiac waveforms. Use Value: ±0.5 LSB INL preserves diagnostic waveform fidelity; 2.25MHz input bandwidth captures QRS complex rise-time without aliasing. |
| Battery-Powered Test Equipment | System Supervision |
Use Scenario: Handheld multimeter measuring DC voltage, current, and resistance using shared analog front-end. IC Role / Device Role / Timing Role: Reconfigurable ADC switching between single-ended (voltage), differential (current shunt), and ratiometric (RTD) modes via SPI command. Use Value: Single-chip solution replaces discrete mux + op-amp + ADC stack; 10-bit resolution meets Class II meter accuracy requirements per IEC 61000-4-30. |
Use Scenario: Industrial PLC monitoring rail voltages, temperature, and fan tachometer signals across 4 I/O modules. IC Role / Device Role / Timing Role: Local ADC on each module digitizing analog supervision signals; SPI interface enables daisy-chained backplane communication. Use Value: 16-pin QSOP fits into 10mm × 10mm module footprint; 1µA shutdown current prevents parasitic drain during sleep cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit, low-power, serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200ksps, no internal reference, requires external REF; SPI-only interface. | Lower resolution limits dynamic range in precision sensor applications; lacks bipolar mode and REFADJ tuning. | Choose for cost-sensitive, high-speed 8-bit systems where 10-bit accuracy is unnecessary. |
| MAX11100ETE+ | 12-bit resolution, 500ksps, internal 2.048V reference, 10-channel mux, 16-QFN package. | Higher resolution and channel count increase PCB area and firmware complexity; 2.048V reference incompatible with legacy 2.5V scaling. | Choose when upgrading resolution and channel density is justified, and board redesign accommodates 3mm × 3mm QFN. |
Compared with ADS7822U and MAX11100ETE+, the MAX1248AEEE+T uniquely balances 10-bit accuracy, internal 2.5V reference adjustability, QSOP-16 compatibility with legacy SOIC layouts, and proven 1µA shutdown current - making it optimal for retrofitting or space-constrained portable instrumentation.
Availability
MAX1248AEEE+T 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 RoHS-compliant packaging.
Supply support for MAX1248AEEE+T 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 portable applications.
The MAX1248/MAX1249 family targets low-power, multi-channel data acquisition in size- and energy-constrained systems - emphasizing integrated references, flexible input configurations, and minimal external component count.
FAQ
What is the operating temperature range for MAX1248AEEE+T?
The MAX1248AEEE+T is specified for 0°C to +70°C ambient operation. This commercial-grade temperature range aligns with its QSOP-16 packaging and target applications in portable instrumentation and consumer-grade data loggers. The device maintains ±0.5 LSB INL and 1.2mA supply current performance across this full range when powered from +3V.
Does MAX1248AEEE+T support differential input mode, and how is it configured?
Yes, MAX1248AEEE+T supports pseudo-differential input mode using CH0/CH1 or CH2/CH3 pairs. Configuration is done via the 8-bit control byte: set SGL/DIF = 0 (bit 2), then select channel pair using SEL2–SEL0 bits (Tables 2 and 3 in datasheet). In this mode, IN+ samples the selected positive channel while IN− is tied to the corresponding negative channel, requiring COM stability within ±0.5LSB.
How does the SHDN pin function on MAX1248AEEE+T?
The SHDN pin on MAX1248AEEE+T provides three distinct states: pulled low → full shutdown (1µA ICC); pulled high → internal reference compensation mode; left floating → external compensation mode. This single pin controls both power state and reference buffer configuration - eliminating need for separate control lines and simplifying PCB routing in compact designs.
Can MAX1248AEEE+T operate with an external reference, and what modifications are required?
No - MAX1248AEEE+T integrates a fixed 2.5V internal reference and cannot accept an external reference. That functionality is reserved for the MAX1249 variant. To use an external reference, select MAX1249AEEE+T instead; for MAX1248AEEE+T, the VREF pin outputs 2.500V ±0.3% and must be bypassed with 4.7µF for internal compensation or disabled via REFADJ = VDD if unused.
What is the minimum acquisition time required for accurate conversions with MAX1248AEEE+T?
The guaranteed minimum acquisition time for MAX1248AEEE+T is 1.5µs, measured from the falling SCLK edge after the eighth control bit. This value holds for source impedances ≤3kΩ. For higher impedances, tACQ increases per tACQ = 7.6 × (RS + 9kΩ) × 16pF, requiring additional settling time or local 0.01µF input capacitance to maintain 10-bit accuracy.
MAX1248AEEE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1248AEEE+T FAQ
1.How can I place an order for MAX1248AEEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1248AEEE+T 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 MAX1248AEEE+T reliable?
The price and inventory of MAX1248AEEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1248AEEE+T is usually 5 days.
3.What payment methods are accepted for MAX1248AEEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1248AEEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1248AEEE+T?
MAX1248AEEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1248AEEE+T 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 MAX1248AEEE+T?
For technical support, including MAX1248AEEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1248AEEE+T requirements.
6.How does Aetrix verify that MAX1248AEEE+T is sourced from the original manufacturer or authorized distributors?
All MAX1248AEEE+T 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 MAX1248AEEE+T meets industry standards.
7.What is the process for return or replacement of MAX1248AEEE+T?
All MAX1248AEEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1248AEEE+T, 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 MAX1248AEEE+T part is unused and in its original packaging.
Return procedure for MAX1248AEEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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