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Analog Devices Inc./Maxim Integrated MAX1247BCEE
- Part No.:
- MAX1247BCEE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1247BCEE.pdf
- Description:
- IC ADC 12BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,461
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Product details
Overview
MAX1247BCEE 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 serial interface. It operates from a single +2.7V to +5.25V supply, consumes 1.2mA at 133ksps, and supports external reference input at VREF pin. It is used in portable data logging and battery-powered medical instruments where low power and flexible input configuration are critical.
For engineers reviewing the MAX1247BCEE datasheet, MAX1247BCEE pinout, MAX1247BCEE application, or MAX1247BCEE equivalent, key selection considerations include its 16-pin QSOP package, ±1 LSB INL (max), 1.5µs acquisition time, external reference requirement, and shutdown current of 1µA - all essential for precision, low-power embedded sensing systems.
Technical Context
The MAX1247BCEE implements successive-approximation register (SAR) architecture with an internal track/hold circuit that acquires input signals within 1.5µs. Its analog front-end supports four single-ended or two differential input pairs (CH0/CH1, CH2/CH3), with COM pin establishing zero-code reference in single-ended mode.
It uses either an external serial clock (up to 2MHz) or internal clock for conversion control; SSTRB provides timing strobe for TMS320-family DSPs. The device requires an external 2.5V reference applied to VREF, and REFADJ enables ±1.5% voltage adjustment when buffer is enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization. |
| INL (max) | ±1 LSB - ensures monotonicity and ≤0.024% full-scale linearity error across temperature. |
| Sampling Rate | 133ksps - supports real-time capture of audio-band and sensor signals without undersampling artifacts. |
| Supply Range | +2.7V to +5.25V - enables direct interfacing with 3.3V and 5V microcontrollers and mixed-signal systems. |
| Power (133ksps) | 1.2mA - reduces thermal load and extends battery life in portable instrumentation. |
| Acquisition Time | 1.5µs - allows accurate sampling of fast-rising transients with source impedances ≤1kΩ. |
| Reference Input | External 2.5V at VREF - decouples accuracy from internal drift; supports precision external references. |
| Shutdown Current | 1µA - enables ultra-low-power sleep modes between measurements in energy-constrained designs. |
Pinout & Package
MAX1247BCEE is housed in a 16-pin QSOP package (5.3mm × 10.2mm), occupying the same PCB footprint as an 8-pin SOIC - enabling compact, space-optimized layouts.
| 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 near pin. |
| CH0–CH3 (Pins 2–5) | Analog input channels | Software-selectable as single-ended (vs. COM) or differential pairs (CH0/CH1, CH2/CH3). |
| COM (Pin 6) | Analog ground reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB. |
| SHDN (Pin 7) | Three-level shutdown control | Low = full shutdown (1µA); float = external compensation; high = internal compensation mode. |
| VREF (Pin 8) | Reference input/output | Accepts external 2.5V reference; internal buffer disabled by tying REFADJ to VDD. |
| REFADJ (Pin 9) | Reference buffer adjustment | Enables ±1.5% VREF tuning when buffer active; tie to VDD to disable buffer for external reference use. |
| AGND (Pin 10) | Analog ground | Separate return path for analog circuitry; must be star-connected to minimize noise coupling. |
| DGND (Pin 11) | Digital ground | Return for digital I/O; isolated from AGND except at single-point system ground. |
| DOUT (Pin 12) | Serial data output | MSB-first, clocked on SCLK falling edge; high-impedance when CS = high. |
| SSTRB (Pin 13) | Serial strobe output | Pulses high before MSB decision in external clock mode; indicates conversion start/end in internal mode. |
| DIN (Pin 14) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; defines channel, polarity, and clock mode. |
| CS (Pin 15) | Active-low chip select | Enables serial interface; DOUT goes high-Z when CS = high; required for multi-device SPI buses. |
| SCLK (Pin 16) | Serial clock input | Drives data transfer and (in external mode) conversion timing; 40–60% duty cycle required. |
Key Features
| Feature | Design Value |
|---|---|
| 4-wire SPI/QSPI/MICROWIRE interface | Direct connection to microcontrollers without level shifters or glue logic; supports CPOL=0/CPHA=0. |
| Software-configurable input modes | Single-ended (4 ch) or differential (2 ch), unipolar (0V to VREF) or bipolar (±VREF/2) via control byte bits. |
| External reference support | VREF pin accepts 1.0V to (VDD + 50mV); input resistance 18–25kΩ enables stable buffering with low-noise refs. |
| Low-power shutdown | 1µA shutdown current and automatic power-up on CS/DIN activity enable burst-mode sensing with minimal overhead. |
| Track/hold with 2.25MHz bandwidth | Supports accurate digitization of transient events and undersampling of RF signals up to ~1MHz. |
| Channel-to-channel matching | ±0.25 LSB offset matching and ±0.25 LSB gain matching ensure consistent multi-channel measurement accuracy. |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor nodes recording temperature, humidity, and pressure over days. IC Role / Device Role / Timing Role: Primary ADC acquiring multiplexed analog sensor outputs with configurable gain and polarity per channel. Use Value: 1.2mA active current and 1µA shutdown extend battery life; 16-pin QSOP minimizes PCB area in handheld enclosures. |
Use Scenario: Portable ECG or pulse oximeter requiring precise, low-noise analog front-end digitization. IC Role / Device Role / Timing Role: High-accuracy 12-bit ADC capturing differential biopotential signals with <1 LSB INL and low THD. Use Value: ±1 LSB INL and 73dB SINAD ensure clinical-grade waveform fidelity; external reference supports calibrated sensor scaling. |
| Pen Digitizers | Battery-Powered Instruments |
Use Scenario: Resistive touch overlay in stylus-based tablets, measuring X/Y electrode voltage differentials. IC Role / Device Role / Timing Role: Dual-differential ADC converting CH0/CH1 and CH2/CH3 pairs to resolve pen position coordinates. Use Value: Pseudo-differential architecture and 1.5µs acquisition enable fast, jitter-free coordinate updates at >100Hz sampling. |
Use Scenario: Handheld multimeter or gas detector with multiple analog sensor inputs and LCD display. IC Role / Device Role / Timing Role: Low-power, multi-channel ADC managing thermistor, electrochemical, and photodiode signals sequentially. Use Value: Single-supply +2.7V to +5.25V operation simplifies power design; software-configurable inputs reduce BOM count. |
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 | 12-bit, 200ksps, +2.7V to +5.5V, internal reference only, no differential mode, 8-pin SOIC. | Lacks differential input support and software-configurable polarity; suited for simpler single-ended systems. | Select when board space is constrained and only unipolar single-ended inputs are needed; verify reference stability requirements. |
| MAX11131ETE+ | 12-bit, 500ksps, +2.7V to +3.6V, internal reference, 10-pin µMAX, SPI-only interface. | Higher speed but narrower supply range; no external reference option or bipolar mode support. | Prefer for 3.3V-only systems needing faster throughput; not suitable for 5V domains or precision external reference use. |
Compared with ADS7822U and MAX11131ETE+, the MAX1247BCEE uniquely combines external reference flexibility, bipolar/differential configurability, and 16-pin QSOP packaging - making it optimal for portable, multi-sensor applications demanding calibration traceability and input versatility.
Availability
MAX1247BCEE 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 guaranteed authentic sourcing.
Supply support for MAX1247BCEE 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 MAX1246/MAX1247 family was engineered for low-power, high-accuracy data acquisition in space- and energy-constrained systems - emphasizing flexible input configuration, serial interface compatibility, and robust performance across voltage and temperature ranges.
FAQ
What is the reference voltage requirement for MAX1247BCEE?
The MAX1247BCEE requires an external reference voltage applied to the VREF pin, typically 2.5V. Unlike the MAX1246, it does not include an internal reference. The reference input range is 1.0V to (VDD + 50mV), and the device draws 100–150µA from the reference source. For best accuracy, use a low-noise, low-drift external reference with adequate bypassing (e.g., 0.1µF ceramic + 4.7µF tantalum).
Does MAX1247BCEE support differential input mode?
Yes, the MAX1247BCEE supports pseudo-differential input mode using CH0/CH1 and CH2/CH3 pairs. In this mode, the device samples the voltage difference between the selected positive and negative inputs, with the negative input required to remain stable within ±0.5 LSB relative to AGND. Configuration is done via the SGL/DIF bit (bit 2) in the 8-bit control byte.
What is the meaning of the SHDN pin states on MAX1247BCEE?
The SHDN pin on MAX1247BCEE has three valid states: pulled low enables full power-down (1µA), pulled high configures the reference buffer for internal compensation, and left floating selects external compensation mode. This three-level control allows fine-grained power management and reference stability optimization without external logic - a key feature for autonomous sensor nodes using the MAX1247BCEE.
Can MAX1247BCEE operate with a 5V microcontroller SPI interface?
Yes, MAX1247BCEE supports VDD up to +5.25V and features 5V-tolerant digital inputs (DIN, SCLK, CS, SHDN) with VIH minimum of 0.7×VDD. When powered from 5V, its digital interface operates natively with 5V microcontrollers. Ensure AGND and DGND are properly partitioned and that VREF is scaled appropriately (e.g., 2.5V reference for full 12-bit resolution).
What is the maximum recommended source impedance for MAX1247BCEE analog inputs?
The MAX1247BCEE specifies a maximum acquisition time of 1.5µs for source impedances ≤1kΩ. For higher impedances, acquisition time increases per tACQ = 9 × (RS + 9kΩ) × 16pF. To maintain AC performance, keep RS below 1kΩ; if higher, add a 0.01µF capacitor at each input to limit bandwidth and prevent settling errors - though this reduces usable signal bandwidth as a trade-off.
MAX1247BCEE 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:
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1247BCEE FAQ
1.How can I place an order for MAX1247BCEE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1247BCEE 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 MAX1247BCEE reliable?
The price and inventory of MAX1247BCEE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1247BCEE is usually 5 days.
3.What payment methods are accepted for MAX1247BCEE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1247BCEE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1247BCEE?
MAX1247BCEE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1247BCEE 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 MAX1247BCEE?
For technical support, including MAX1247BCEE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1247BCEE requirements.
6.How does Aetrix verify that MAX1247BCEE is sourced from the original manufacturer or authorized distributors?
All MAX1247BCEE 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 MAX1247BCEE meets industry standards.
7.What is the process for return or replacement of MAX1247BCEE?
All MAX1247BCEE units undergo pre-shipment inspection (PSI). If there is an issue with MAX1247BCEE, 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 MAX1247BCEE part is unused and in its original packaging.
Return procedure for MAX1247BCEE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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