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Analog Devices Inc./Maxim Integrated MAX1248BCEE+T
- Part No.:
- MAX1248BCEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1248BCEE+T.pdf
- Description:
- IC ADC 10BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,681
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Product details
Overview
MAX1248BCEE+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 input modes. It operates from +2.7V to +5.25V, achieves 133ksps conversion rate, and draws only 1.2mA at 3V - enabling high-precision data acquisition in portable medical instruments and battery-powered sensor nodes.
For engineers reviewing the MAX1248BCEE+T datasheet, MAX1248BCEE+T pinout, MAX1248BCEE+T application, or MAX1248BCEE+T equivalent, this page delivers verified technical context, exact QSOP-16 pin mapping, real-world use-value metrics (e.g., ±0.5LSB channel-to-channel offset matching, 1.5µs acquisition time), and two validated alternative parts for design flexibility.
Technical Context
The MAX1248BCEE+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 enables pseudo-differential sampling across CH0–CH3 with COM as common-mode reference, and features ±0.5LSB stability requirement on COM during conversion.
It integrates a buffered 2.5V internal reference (±1.5% adjustable via REFADJ), reference-buffer amplifier with internal/external compensation selectable via SHDN pin state, and hard-wired three-level shutdown control (low = full power-down, high = internal compensation, float = external compensation). The serial interface supports MSB-first, falling-edge DOUT timing and direct TMS320 DSP connection via SSTRB strobe.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes for precision measurement of analog sensor outputs. |
| Conversion Rate | 133ksps - supports real-time sampling of fast transients in system supervision and pen digitizer applications. |
| INL (Integral Nonlinearity) | ±0.5 LSB - ensures monotonicity and <0.05% full-scale error after calibration, critical for medical instrument accuracy. |
| Supply Current | 1.2mA at 133ksps / 54µA at 1ksps / 1µA in power-down - enables multi-second battery life in portable data loggers. |
| Input Configuration | 4-channel single-ended OR 2-channel differential - provides flexible signal routing without external multiplexers. |
| Reference | Internal 2.5V ±30ppm/°C - eliminates need for external reference IC, reducing BOM count and layout area in QSOP-16 footprint. |
| Operating Voltage | +2.7V to +5.25V - compatible with Li-ion, 3.3V, and 5V supply rails across industrial and consumer systems. |
Pinout & Package
MAX1248BCEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm), occupying the same PCB area as an 8-pin SOIC - enabling compact, high-density designs without redesigning board space.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply voltage input | Accepts +2.7V to +5.25V; powers analog and digital sections; requires local 0.1µF bypass to AGND. |
| CH0–CH3 | Analog input channels | Software-selectable as single-ended inputs (vs. COM) or differential pairs (CH0/CH1, CH2/CH3); support ±0.5LSB COM stability requirement. |
| COM | Analog ground reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5LSB during conversion to avoid INL degradation. |
| SHDN | Three-level shutdown control | Low = full power-down (1µA); high = internal compensation mode; float = external compensation mode - enables dynamic reference tuning. |
| DIN | Serial data input | Accepts 8-bit control byte on SCLK rising edge; first '1' bit defines MSB; supports SPI/QSPI/MICROWIRE protocols. |
| DOUT | Serial data output | Outputs 10-bit result MSB-first on SCLK falling edge; high-impedance when CS = high. |
| SCLK | Serial clock input | Drives data transfer and (in external mode) conversion timing; 100kHz–2MHz range; 40–60% duty cycle required. |
| CS | Active-low chip select | Enables serial interface; DOUT enters high-Z when CS = high; allows multiple devices on shared bus. |
| SSTRB | Serial strobe output | Signals conversion start/end: low during conversion (internal mode) or pulses high before MSB (external mode); connects directly to TMS320 DSP. |
| VREF | Reference buffer output / ADC reference input | Provides 2.500V ±0.030V (25°C); adjustable ±1.5% via REFADJ; requires 4.7µF capacitor for internal compensation. |
| REFADJ | Reference buffer adjustment input | Adjusts VREF output; tie to VDD to disable internal buffer (for MAX1249 compatibility); ±50µA input current. |
| AGND / DGND | Analog and digital ground | Must be separated and joined at single point; AGND carries analog return currents; DGND carries digital switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| 4-wire SPI/QSPI/MICROWIRE interface | Eliminates level shifters or glue logic; interoperable with standard microcontroller peripherals without firmware modification. |
| Software-configurable input modes | Single control byte selects unipolar/bipolar and single-ended/differential operation - simplifies firmware abstraction layer. |
| Internal 2.5V reference with ±1.5% adjustability | Reduces component count by removing external reference IC; REFADJ pin enables fine-tuning for system-level calibration. |
| 1.5µs track/hold acquisition time | Supports high-impedance sensor sources up to 3kΩ without performance loss; enables accurate sampling of thermocouples and RTDs. |
| Three-level SHDN pin control | Enables dynamic power management: full shutdown (1µA), fast wake-up (54µA), and reference buffer configuration - optimizing energy per conversion. |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure over 72-hour deployments. IC Role / Device Role / Timing Role: Primary ADC acquiring four analog sensor outputs sequentially at 1ksps with automatic power-down between samples. Use Value: 54µA active current at 1ksps extends CR2032 battery life beyond 6 months; internal reference eliminates drift-related recalibration. |
Use Scenario: Handheld ECG monitor measuring differential lead voltages with sub-mV resolution and low noise floor. IC Role / Device Role / Timing Role: Front-end ADC performing pseudo-differential sampling on CH0/CH1 pair with COM referenced to right-leg drive circuit. Use Value: ±0.5LSB channel-to-channel offset matching ensures consistent gain across leads; 10-bit resolution resolves 2.44mV steps at 2.5V reference. |
| Battery-Powered Instruments | System Supervision |
|
Use Scenario: Portable multimeter measuring DC voltage, current, and resistance using auto-ranging analog front-end. IC Role / Device Role / Timing Role: Configurable ADC supporting unipolar 0–2.5V and bipolar ±1.25V ranges via software control byte. Use Value: Single-chip solution replaces dual ADC + reference + mux; 10-bit linearity ensures <0.1% measurement accuracy across ranges. |
Use Scenario: Industrial PLC monitoring rail voltages, temperature sensors, and fan tachometer signals in real time. IC Role / Device Role / Timing Role: Multi-channel supervisor ADC scanning 4 analog inputs every 10ms to detect overvoltage, thermal fault, or fan stall. Use Value: 133ksps throughput allows oversampling and digital filtering; SPI interface enables deterministic polling from ARM Cortex-M4 host. |
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+T | No internal reference; requires external 2.5V reference; otherwise identical pinout, timing, and feature set. | Suitable where system already provides precision external reference; avoids internal reference tempco (±30ppm/°C). | Select MAX1249BCEE+T if reference accuracy >±0.1% is required and external reference is available. |
| ADS7822U | 8-bit resolution, 200ksps, single-channel, no internal reference, different SPI framing (no SSTRB), SO-8 package. | Lower cost for non-critical applications; lacks multi-channel capability and programmable input modes. | Choose ADS7822U only for single-input, lower-resolution needs where board space and BOM cost outweigh precision requirements. |
Compared with MAX1249BCEE+T, the MAX1248BCEE+T saves one external component and simplifies layout but trades ±30ppm/°C reference drift for ±1.5% adjustability; versus ADS7822U, it adds 2 bits of resolution, 4-channel mux, and configurable modes at higher unit cost and larger QSOP-16 footprint.
Availability
MAX1248BCEE+T 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 MAX1248BCEE+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX1248/MAX1249 family was designed for low-power, multi-channel data acquisition in space-constrained, battery-operated systems - emphasizing integration of reference, track/hold, and SPI interface in minimal footprint.
FAQ
What is the operating temperature range for MAX1248BCEE+T?
The MAX1248BCEE+T is rated for 0°C to +70°C ambient operation, as confirmed in the Ordering Information table. This commercial-grade temperature range suits indoor portable instruments, data loggers, and industrial control panels not exposed to extreme thermal environments. The device's internal reference exhibits ±30ppm/°C drift, and INL remains within ±0.5 LSB across this full range.
Does MAX1248BCEE+T require an external reference capacitor?
Yes, MAX1248BCEE+T requires a 4.7µF capacitor at the VREF pin when operating in internal compensation mode (SHDN = high or float). This capacitor stabilizes the internal reference buffer output and ensures ±0.030V accuracy at 25°C. A 0.01µF capacitor is also required at REFADJ for noise suppression, as specified in the Electrical Characteristics table under "Capacitive Bypass at REFADJ".
How does the SHDN pin function on MAX1248BCEE+T?
The SHDN pin on MAX1248BCEE+T provides three distinct operating states: pulling it low enables full power-down (1µA supply current); pulling it high configures the reference buffer for internal compensation; letting it float selects external compensation mode. This three-level control allows dynamic optimization of reference stability and power consumption without external logic, unlike simpler enable/disable pins.
Can MAX1248BCEE+T interface directly with a TMS320 DSP?
Yes, MAX1248BCEE+T supports direct connection to TMS320-family DSPs via its SSTRB (serial strobe) output. In internal clock mode, SSTRB goes low at conversion start and high upon completion - providing hardware-ready signaling for DMA-triggered data capture. The 4-wire serial interface matches TMS320 McBSP timing requirements without additional level-shifting or buffering.
What is the minimum acquisition time for MAX1248BCEE+T?
The minimum acquisition time for MAX1248BCEE+T is 1.5µs, as specified in the Electrical Characteristics table under "tACQ". This value applies when the analog source impedance is ≤3kΩ. For higher impedances, acquisition time increases per the formula tACQ = 7.6 × (RS + 9kΩ) × 16pF, requiring external 0.01µF capacitors at each input to maintain accuracy and bandwidth.
MAX1248BCEE+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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1248BCEE+T FAQ
1.How can I place an order for MAX1248BCEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1248BCEE+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 MAX1248BCEE+T reliable?
The price and inventory of MAX1248BCEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1248BCEE+T is usually 5 days.
3.What payment methods are accepted for MAX1248BCEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1248BCEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1248BCEE+T?
MAX1248BCEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1248BCEE+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 MAX1248BCEE+T?
For technical support, including MAX1248BCEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1248BCEE+T requirements.
6.How does Aetrix verify that MAX1248BCEE+T is sourced from the original manufacturer or authorized distributors?
All MAX1248BCEE+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 MAX1248BCEE+T meets industry standards.
7.What is the process for return or replacement of MAX1248BCEE+T?
All MAX1248BCEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1248BCEE+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 MAX1248BCEE+T part is unused and in its original packaging.
Return procedure for MAX1248BCEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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