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Analog Devices Inc./Maxim Integrated MAX1247BEEE+T
- Part No.:
- MAX1247BEEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1247BEEE+T.pdf
- Description:
- IC ADC 12BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,046
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Product details
Overview
MAX1247BEEE+T from Maxim Integrated is a 12-bit, 4-channel serial analog-to-digital converter (ADC) with integrated track/hold, software-configurable unipolar/bipolar and single-ended/differential inputs, and SPI/QSPI/MICROWIRE-compatible 4-wire interface. It operates from a single +2.7V to +5.25V supply, consumes 1.2mA at 133ksps, and supports external reference input. It is used in portable data loggers and battery-powered medical instruments requiring low-power, high-accuracy signal digitization.
For engineers reviewing the MAX1247BEEE+T datasheet, MAX1247BEEE+T pinout, MAX1247BEEE+T application, or MAX1247BEEE+T equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated QSOP-16 pin functions, confirmed alternative parts with documented functional differences, and supply-chain support details specific to this temperature-grade variant.
Technical Context
The MAX1247BEEE+T implements successive-approximation (SAR) conversion with an internal track/hold circuit that acquires input signals in ≤1.5µs. It supports both external clock mode (up to 2MHz SCLK, 6µs conversion time) and internal clock mode (7.5MHz typical), enabling flexible timing control across microcontroller and DSP interfaces.
Its analog front-end allows software-selectable input configurations: 4 single-ended or 2 pseudo-differential channels, with COM pin defining zero-code voltage. The device requires an external reference (1.0V to VDD+50mV), and its REFADJ pin enables ±1.5% reference adjustment when buffer is active - though buffer is disabled for MAX1247 by tying REFADJ to VDD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step, enabling sub-millivolt precision with 2.5V reference. |
| INL (Integral Nonlinearity) | ±1 LSB max - ensures monotonicity and <0.025% full-scale error across entire code range. |
| Sampling Rate | 133ksps max - supports real-time capture of signals up to ~66kHz Nyquist bandwidth. |
| Supply Current | 1.2mA at 133ksps / 3V - enables >100hr operation on a 300mAh Li-ion cell in continuous acquisition. |
| Power-Down Current | 1µA - reduces system standby power by >99.9% versus active mode, critical for wake-on-event designs. |
| Input Voltage Range | Unipolar: 0V to VREF; Bipolar: ±VREF/2 - accommodates both ground-referenced sensors and AC-coupled transducer outputs. |
| Reference Input | External only (1.0V to VDD+50mV) - decouples accuracy from internal drift; supports precision bandgap or DAC-derived references. |
Pinout & Package
MAX1247BEEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), occupying the same PCB footprint as an 8-pin SOIC - enabling compact, space-constrained layouts without redesign.
| 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/DGND. |
| CH0–CH3 (Pins 2–5) | Analog input channels | Software-selectable as single-ended (vs. COM) or differential pairs (CH0/CH1, CH2/CH3); 16pF input capacitance mandates low-Z source or external RC filtering. |
| COM (Pin 6) | Analog common reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5LSB (±0.3mV @ 2.5V ref); connects to clean analog ground plane. |
| SHDN (Pin 7) | Three-level shutdown control | Pull low → full power-down (1µA); float → external compensation; pull high → internal compensation (not used in MAX1247). |
| VREF (Pin 8) | Reference input/output | External reference input only (MAX1247); disable internal buffer by tying REFADJ to VDD; accepts 1.0V–VDD+50mV. |
| AGND (Pin 10) | Analog ground return | Separate from DGND; must connect to quiet analog ground plane; star-point tie to DGND recommended at single point. |
| DGND (Pin 11) | Digital ground return | Return path for digital I/O; isolated from AGND except at designated system ground point to minimize noise coupling. |
| CS (Pin 15) | Active-low chip select | Enables serial interface; DOUT and SSTRB go high-Z when CS = high; must be asserted before each 8-bit transfer. |
| DIN (Pin 14) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; bit 7 (START) initiates configuration; bits 6–0 define channel, mode, and clock/power-down. |
| DOUT (Pin 12) | Serial data output | Outputs 12-bit result MSB-first on SCLK falling edge; high-Z when CS = high; requires pull-up if shared bus. |
| SCLK (Pin 16) | Serial clock input | Drives data I/O and (in external mode) SAR conversion; 40–60% duty cycle required; max 2MHz for full spec compliance. |
| SSTRB (Pin 13) | Serial strobe output | In external mode: pulses high for one SCLK period before MSB decision; used for TMS320-family DSP synchronization. |
| REFADJ (Pin 9) | Reference buffer adjust | Must be tied to VDD to disable internal reference buffer (required for MAX1247); floating or grounded invalidates operation. |
Key Features
| Feature | Design Value |
|---|---|
| 4-wire SPI/QSPI/MICROWIRE interface | Eliminates level-shifting and glue logic; directly connects to ARM Cortex-M, MSP430, and TMS320Cxx DSPs without protocol translation. |
| Software-configurable input modes | Single control byte selects unipolar/bipolar and single-ended/differential - enables runtime reconfiguration for multi-sensor systems. |
| Track/hold with 1.5µs acquisition time | Supports accurate sampling of signals from sources up to 1kΩ impedance without external op-amp buffering. |
| Low-power shutdown (1µA) | Permits duty-cycled operation in sensor nodes - e.g., wake every 100ms, sample for 10µs, shut down - extending battery life by orders of magnitude. |
| QSOP-16 package footprint | Matches 8-pin SOIC area, allowing drop-in replacement in legacy layouts while adding 4-channel ADC functionality. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure over weeks. IC Role / Device Role / Timing Role: Primary ADC digitizing multiple analog sensor outputs with configurable gain and polarity via single control byte. Use Value: 1.2mA active current and 1µA shutdown enable >6-month operation on two AA cells; QSOP-16 saves board space vs. discrete solutions. | Use Scenario: Handheld ECG monitor acquiring lead-II differential signals with high CMRR and low noise. IC Role / Device Role / Timing Role: Pseudo-differential ADC converting CH0/CH1 pair; COM referenced to Wilson central terminal. Use Value: ±1 LSB INL and 73dB SINAD ensure diagnostic-grade waveform fidelity; external reference supports calibrated voltage scaling. |
| Pen Digitizers | Battery-Powered Test Equipment |
Use Scenario: Active stylus interface in tablet detecting tip pressure and tilt angle via resistive sensor array. IC Role / Device Role / Timing Role: High-speed 4-channel ADC scanning X/Y electrode pairs and pressure sensor in sequence. Use Value: 133ksps sampling captures rapid pen motion without aliasing; 2.25MHz small-signal bandwidth preserves transient response. | Use Scenario: Portable multimeter measuring DC voltage, AC RMS, and continuity with auto-ranging. IC Role / Device Role / Timing Role: Core ADC providing 12-bit resolution across multiple input ranges using programmable COM and reference scaling. Use Value: Software-selectable unipolar/bipolar modes eliminate need for external level-shifting op-amps; low supply current extends display-on time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200ksps, internal reference only, SPI-only interface, 8-pin SOIC package | Lacks bipolar mode, differential capability, and external reference flexibility; lower resolution limits dynamic range | Select only for cost-sensitive, lower-accuracy applications where 8-bit resolution suffices and board space is extremely constrained. |
| MAX11131AUT+T | 12-bit, 500ksps, internal reference, SPI/QSPI compatible, 10-pin µMAX package, built-in PGA (0.5x–16x) | Higher speed and integrated programmable gain eliminate external amplifiers but require different layout and biasing | Choose when signal conditioning is needed pre-ADC; not drop-in due to different pin count, package, and PGA control requirements. |
Compared with ADS7822U and MAX11131AUT+T, MAX1247BEEE+T uniquely balances 12-bit accuracy, external reference support, true differential input capability, and ultra-low 1µA shutdown current - making it optimal for precision, battery-constrained, multi-sensor systems where flexibility and long-term stability are critical.
Availability
MAX1247BEEE+T is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply, guaranteed long-term availability, and traceable sourcing from authorized channels.
Supply support for MAX1247BEEE+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 industrial, medical, and portable applications - emphasizing low power, high integration, and robust performance.
The MAX1246/MAX1247 family was engineered specifically for battery-operated data-acquisition systems needing 12-bit accuracy, flexible input configuration, and minimal quiescent current - targeting handheld meters, sensor nodes, and portable diagnostics.
FAQ
What is the operating temperature range for MAX1247BEEE+T?
The MAX1247BEEE+T is rated for 0°C to +70°C ambient operation, as indicated by the "B" grade suffix and "E" package designation (QSOP). This commercial-grade temperature range suits indoor portable instruments, consumer test gear, and non-automotive industrial controls where extended thermal margins are not required.
Does MAX1247BEEE+T include an internal voltage reference?
No, MAX1247BEEE+T requires an external reference applied to the VREF pin. Unlike the MAX1246, the MAX1247 does not integrate an internal 2.5V reference. Its REFADJ pin must be tied to VDD to disable the reference buffer - confirming external reference dependency per datasheet Section "INTERNAL REFERENCE (MAX1246 only)".
Can MAX1247BEEE+T perform differential measurements between any two channels?
MAX1247BEEE+T supports pseudo-differential measurements only between predefined pairs: CH0/CH1 and CH2/CH3. It does not allow arbitrary channel combinations (e.g., CH0/CH2) due to internal multiplexer architecture. Table 3 in the datasheet explicitly defines these fixed differential pairings under SGL/DIF = 0 mode.
What is the minimum acquisition time required before conversion starts in MAX1247BEEE+T?
The guaranteed maximum acquisition time (tACQ) for MAX1247BEEE+T is 1.5µs, as specified in the Electrical Characteristics table. This is the minimum interval the track/hold circuit needs to settle after the last control-bit is clocked in - and must be respected regardless of source impedance to ensure full 12-bit accuracy.
How does the SHDN pin function on MAX1247BEEE+T?
On MAX1247BEEE+T, the SHDN pin operates in two valid states: pulled low → full power-down (1µA supply current); left floating → reference buffer disabled (correct state for external reference use). Pulling SHDN high is invalid for MAX1247 and may cause undefined behavior, as internal compensation mode is exclusive to MAX1246.
MAX1247BEEE+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:
- 12
- 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
- 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:
- -
MAX1247BEEE+T FAQ
1.How can I place an order for MAX1247BEEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1247BEEE+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 MAX1247BEEE+T reliable?
The price and inventory of MAX1247BEEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1247BEEE+T is usually 5 days.
3.What payment methods are accepted for MAX1247BEEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1247BEEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1247BEEE+T?
MAX1247BEEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1247BEEE+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 MAX1247BEEE+T?
For technical support, including MAX1247BEEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1247BEEE+T requirements.
6.How does Aetrix verify that MAX1247BEEE+T is sourced from the original manufacturer or authorized distributors?
All MAX1247BEEE+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 MAX1247BEEE+T meets industry standards.
7.What is the process for return or replacement of MAX1247BEEE+T?
All MAX1247BEEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1247BEEE+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 MAX1247BEEE+T part is unused and in its original packaging.
Return procedure for MAX1247BEEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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