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Analog Devices Inc./Maxim Integrated MAX1248BEEE+
- Part No.:
- MAX1248BEEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1248BEEE+.pdf
- Description:
- IC ADC 10BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:372
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Product details
Overview
MAX1248BEEE+ 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 supports shutdown current as low as 1µA - enabling use in portable data loggers and battery-powered medical instruments.
For engineers reviewing the MAX1248BEEE+ datasheet, MAX1248BEEE+ pinout, MAX1248BEEE+ application, or MAX1248BEEE+ equivalent, this page delivers verified technical context, real-world timing and accuracy specs, QSOP-16 package mapping, functional alternatives, and design-critical interface behavior - all grounded in the official MAX1248/MAX1249 Rev 2 datasheet (19-1072).
Technical Context
The MAX1248BEEE+ 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 at 2MHz). Its analog front-end allows software-selectable channel configuration: 4 single-ended (CH0–CH3 vs COM) or 2 pseudo-differential pairs (CH0/CH1, CH2/CH3), with ±0.5LSB COM stability requirement.
It features a dedicated SHDN pin with three-level control (low = full shutdown, high = internal compensation, float = external compensation), a buffered 2.500V ±1.5% adjustable reference (VREF/REFADJ), and digital I/O compatible with 3V/5V logic. The serial interface outputs MSB-first data on DOUT at SCLK falling edge and provides SSTRB strobe for TMS320-family DSP synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR ADC - delivers 1024 discrete output codes with no missing codes over temperature. |
| Sampling Rate | 133ksps maximum with 2MHz external clock - enables real-time acquisition of signals up to 65kHz full-power bandwidth. |
| INL / DNL | ±0.5 LSB integral nonlinearity (TYP), ±1 LSB differential nonlinearity - ensures monotonicity and <0.05% end-point linearity error. |
| Reference | Internal 2.500V ±30ppm/°C reference with ±1.5% REFADJ adjustment range - eliminates need for external precision reference in most applications. |
| Supply Current | 1.2mA at 133ksps (+3V), 54µA at 1ksps (+3V), 1µA in power-down - supports adaptive power management between conversions. |
| Input Configuration | Software-selectable unipolar (0V to VREF) or bipolar (±VREF/2) with single-ended or pseudo-differential modes - simplifies sensor interfacing across diverse signal types. |
| Interface Compatibility | SPI/QSPI/MICROWIRE/TMS320 4-wire serial interface - connects directly to microcontrollers without level shifters or glue logic. |
Pinout & Package
MAX1248BEEE+ is housed in a 16-pin QSOP package (same board footprint as an 8-pin SO), with 4.4mm × 3.9mm body size and 0.65mm lead pitch. Pin functions are validated per Maxim's official pin description (Rev 2, p.7).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Single +2.7V to +5.25V rail powering analog and digital sections; PSR = ±0.3mV over supply range. |
| CH0–CH3 (Pins 2–5) | Analog input channels | Software-multiplexed inputs supporting single-ended (vs COM) or pseudo-differential (CH0/CH1, CH2/CH3) sampling. |
| COM (Pin 6) | Analog ground reference | Zero-code reference for single-ended mode; must remain stable to ±0.5LSB during conversion. |
| SHDN (Pin 7) | Three-state shutdown control | Pull low → full shutdown (1µA); pull high → internal ref compensation; float → external ref compensation. |
| REFADJ (Pin 9) | Reference buffer adjust input | DC voltage input setting VREF output within ±1.5%; tie to VDD to disable internal reference buffer. |
| VREF (Pin 8) | Reference output/input | 2.500V nominal output (MAX1248 only); also accepts external reference when buffer disabled. |
| SCLK (Pin 16) | Serial clock input | Drives data transfer and (in external mode) controls conversion timing; 40–60% duty cycle required. |
| CS (Pin 15) | Active-low chip select | Enables serial interface; DOUT and SSTRB go high-Z when CS = high. |
| DIN (Pin 14) | Serial data input | Accepts 8-bit control byte (START, SEL2–SEL0, UNI/BIP, SGL/DIF, PD1/PD0) on SCLK rising edge. |
| DOUT (Pin 12) | Serial data output | Outputs 10-bit result MSB-first on SCLK falling edge; high-Z when CS = high (external mode) or after read completion. |
| SSTRB (Pin 13) | Serial strobe output | Signals conversion start/end: low during conversion (internal mode) or pulses high before MSB (external mode). |
| AGND (Pin 10) | Analog ground | Separate ground return for analog section; must be isolated from DGND except at single point. |
| DGND (Pin 11) | Digital ground | Ground return for digital I/O; AGND–DGND voltage difference limited to ±0.3V. |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel multiplexer + track/hold | Reduces external signal conditioning; supports 1.5µs acquisition time even with 3kΩ source impedance. |
| Internal 2.5V reference with REFADJ | Eliminates external reference IC and trim pot; ±1.5% adjustment enables calibration to system VREF requirements. |
| Three-level SHDN control | Enables fine-grained power management: full shutdown (1µA), fast shutdown (MAX1248 only), or reference buffer configuration. |
| SPI/QSPI/MICROWIRE/TMS320 compatibility | Direct connection to common microcontrollers and DSPs without protocol translation or external logic. |
| Software-configurable input modes | Single control byte selects unipolar/bipolar and single-ended/differential operation - simplifies firmware adaptation across sensor types. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor nodes logging temperature, humidity, and pressure over days. IC Role / Device Role / Timing Role: 10-bit ADC digitizing low-bandwidth analog sensor outputs with minimal power overhead between samples. Use Value: 54µA at 1ksps and 1µA shutdown current extend battery life; internal reference removes calibration drift from external components. |
Use Scenario: Handheld ECG or pulse oximeter requiring compact, low-noise analog front-end with clinical-grade linearity. IC Role / Device Role / Timing Role: Pseudo-differential ADC rejecting common-mode noise from biopotential electrodes while maintaining ±0.5LSB COM stability. Use Value: ±0.5 LSB INL and 66dB SINAD meet Class II medical device accuracy requirements; QSOP-16 footprint saves PCB area. |
| Battery-Powered Test Equipment | System Supervision |
Use Scenario: Field-deployable multimeter or power analyzer operating from Li-ion cells with >10-hour runtime. IC Role / Device Role / Timing Role: Configurable unipolar/bipolar input handling both DC voltage rails and AC-coupled signals without hardware rework. Use Value: Software-selectable input range avoids manual range switching; 133ksps sampling captures transients during fault events. |
Use Scenario: Industrial PLC or server motherboard monitoring supply voltages, temperatures, and fan speeds. IC Role / Device Role / Timing Role: Multi-channel ADC scanning multiple analog supervision points via simple SPI polling sequence. Use Value: 4-wire interface enables daisy-chaining with other supervisory ICs; low 1.2mA active current minimizes thermal impact on sensing accuracy. |
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 |
|---|---|---|---|
| MAX1249BEEE+ | Requires external reference (no internal VREF); otherwise identical pinout, timing, and interface. | Suitable where system already provides a precision external reference (e.g., bandgap or DAC output). | Select MAX1249BEEE+ only if external reference improves overall system accuracy or reduces BOM count. |
| ADS7822U | 12-bit resolution, 200ksps, SPI-only interface, no internal reference, 8-pin SOIC package. | Better resolution but higher power (1.5mA active); lacks SHDN pin and software-configurable bipolar mode. | Choose ADS7822U when 12-bit precision is mandatory and bipolar input support is not required. |
Compared with MAX1249BEEE+, the MAX1248BEEE+ saves board space and cost by integrating the reference, while ADS7822U trades configurability for higher resolution - making MAX1248BEEE+ optimal for compact, low-power, multi-range sensor systems where reference integration matters.
Availability
MAX1248BEEE+ is available at Aetrix Electronics and suitable for portable data logging, battery-powered instrumentation, and system supervision requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX1248BEEE+ 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 - with emphasis on integration, low power, and reliability.
The MAX1248/MAX1249 product line delivers low-power, multi-channel serial ADCs optimized for portable and battery-operated systems needing high accuracy, flexible input configuration, and minimal external components.
FAQ
What is the operating temperature range for MAX1248BEEE+?
The MAX1248BEEE+ is rated for 0°C to +70°C ambient operation, matching the "C" grade specification in the MAX1248 ordering table. This range is validated across all electrical parameters including INL (±0.5 LSB TYP), reference stability (±30ppm/°C), and supply current (1.2mA at 133ksps). It is not rated for extended industrial (–40°C to +85°C) or military temperature ranges.
Does MAX1248BEEE+ support differential input mode?
Yes, MAX1248BEEE+ supports pseudo-differential input mode via software configuration: setting SGL/DIF = 0 in the control byte selects differential pairs CH0/CH1 or CH2/CH3. However, only the positive input (IN+) is actively sampled; the negative input (IN–) must remain stable to ±0.5LSB relative to AGND, typically achieved using a 0.1µF capacitor to AGND.
How does the SHDN pin function on MAX1248BEEE+?
The SHDN pin on MAX1248BEEE+ provides three-level control: pulled low → full shutdown (1µA supply current); pulled high → internal reference buffer in internal compensation mode; left floating → reference buffer in external compensation mode. This enables precise power-state control and reference configuration without additional control lines.
Can MAX1248BEEE+ operate with a 5V supply?
Yes, MAX1248BEEE+ supports +2.7V to +5.25V single-supply operation. At VDD = 5.25V, typical supply current is 2.0mA (133ksps), reference output remains 2.500V ±0.030V, and digital I/O tolerates 5V logic levels. All absolute maximum ratings (e.g., CHx to AGND = –0.3V to VDD + 0.3V) and dynamic specs (SINAD = 66dB) are specified across this full range.
What is the minimum acquisition time for MAX1248BEEE+?
The minimum acquisition time (tACQ) for MAX1248BEEE+ is 1.5µs - defined as the maximum time required for the track/hold circuit to settle after the last control bit is clocked in. This value holds for source impedances ≤3kΩ; higher impedances increase tACQ per tACQ = 7.6 × (RS + 9kΩ) × 16pF, requiring longer inter-conversion delays to maintain accuracy.
MAX1248BEEE+ 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1248BEEE+ FAQ
1.How can I place an order for MAX1248BEEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1248BEEE+ 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 MAX1248BEEE+ reliable?
The price and inventory of MAX1248BEEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1248BEEE+ is usually 5 days.
3.What payment methods are accepted for MAX1248BEEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1248BEEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1248BEEE+?
MAX1248BEEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1248BEEE+ 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 MAX1248BEEE+?
For technical support, including MAX1248BEEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1248BEEE+ requirements.
6.How does Aetrix verify that MAX1248BEEE+ is sourced from the original manufacturer or authorized distributors?
All MAX1248BEEE+ 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 MAX1248BEEE+ meets industry standards.
7.What is the process for return or replacement of MAX1248BEEE+?
All MAX1248BEEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1248BEEE+, 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 MAX1248BEEE+ part is unused and in its original packaging.
Return procedure for MAX1248BEEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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