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Analog Devices Inc./Maxim Integrated MAX1247ACEE+T
- Part No.:
- MAX1247ACEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1247ACEE+T.pdf
- Description:
- IC ADC 12BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,611
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Product details
Overview
MAX1247ACEE+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 serial interface. It operates from a single +2.7V to +5.25V supply, consumes 1.2mA at 133ksps (3V), and features external reference input (VREF pin), 16-pin QSOP package, and 1.5µs acquisition time - used in portable data loggers and battery-powered medical instruments.
For engineers reviewing the MAX1247ACEE+T datasheet, MAX1247ACEE+T pinout, MAX1247ACEE+T application, or MAX1247ACEE+T equivalent, key selection considerations include its external-reference architecture (vs. internal-ref MAX1246), 0°C to +70°C temperature grade, QSOP-16 footprint, 12-bit resolution with ±0.5 LSB INL (max), and compatibility with TMS320-family DSPs via SSTRB strobe output.
Technical Context
The MAX1247ACEE+T implements successive-approximation register (SAR) conversion with an on-chip track/hold circuit that acquires input signals in ≤1.5µs and supports both internal clock mode (35–65kHz) and external clock mode (up to 2MHz). Its analog front-end allows pseudo-differential sampling across CH0–CH3 with COM as common reference, and configurable input ranges: 0V to VREF (unipolar) or ±VREF/2 (bipolar).
Digital control is handled via an 8-bit command byte (START, SEL2–SEL0, UNI/BIP, SGL/DIF, PD1/PD0) shifted in on DIN with SCLK rising edge; conversion results are read MSB-first on DOUT at SCLK falling edge. The SHDN pin provides three-level shutdown control (low = full power-down, high = internal compensation, float = external compensation), enabling µA-level quiescent current in power-down mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for precise analog signal digitization. |
| INL (max) | ±0.5 LSB - ensures monotonicity and <0.012% full-scale linearity error over temperature. |
| Sampling Rate | 133ksps - supports real-time capture of signals up to ~66.5kHz (Nyquist-limited) with external 2MHz clock. |
| Supply Range | +2.7V to +5.25V - enables direct interfacing with 3.3V and 5V logic/system rails without level-shifting. |
| Power Consumption | 1.2mA @133ksps, 3V - enables >10-hour operation on a 12mAh coin cell in burst-sampling systems. |
| Reference Input | VREF pin accepts 1.0V to (VDD + 50mV) - supports precision external references (e.g., REF5025) for improved stability vs. internal ref. |
| Acquisition Time | 1.5µs - sets minimum inter-conversion interval when using external clock; critical for high-throughput multiplexed sensing. |
Pinout & Package
MAX1247ACEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), occupying the same PCB area as an 8-pin SOIC - enabling compact, space-constrained designs without redesigning layout footprints.
| 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. |
| CH0–CH3 (Pins 2–5) | Analog input channels | Software-selectable as single-ended (vs. COM) or differential pairs (CH0/CH1, CH2/CH3); max input range ±VREF/2 (bipolar). |
| COM (Pin 6) | Analog ground reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB; connects to AGND plane. |
| SHDN (Pin 7) | Three-state shutdown control | Pull low → full power-down (1µA); pull high → internal ref compensation; float → external compensation mode. |
| AGND (Pin 10) | Analog ground return | Separate low-noise ground for analog section; must be star-connected to DGND at single point near VDD decoupling. |
| DGND (Pin 11) | Digital ground return | Return path for digital I/O; isolated from AGND except at single-point connection to minimize noise coupling. |
| VREF (Pin 8) | Reference voltage input/output | External reference input (buffer disabled); accepts 1.0V–(VDD+50mV); no internal reference - unlike MAX1246. |
| SCLK (Pin 16) | Serial clock input | Drives data transfer (rising edge clocks DIN, falling edge clocks DOUT); also controls conversion speed in external clock mode. |
| CS (Pin 15) | Chip select (active-low) | Enables serial interface; DOUT and SSTRB go high-Z when CS = high; required for multi-device SPI bus sharing. |
| DIN (Pin 14) | Serial data input | Receives 8-bit command byte (channel, mode, clock/power-down settings); sampled on SCLK rising edge. |
| DOUT (Pin 12) | Serial data output | Outputs 12-bit conversion result MSB-first on SCLK falling edge; high-Z when CS = high. |
| SSTRB (Pin 13) | Serial strobe output | Pulses high for one SCLK period before MSB decision (external clock mode); asserts low during conversion start (internal mode). |
| REFADJ (Pin 9) | Reference buffer adjustment | Tie to VDD to disable internal reference buffer - mandatory for MAX1247 since it lacks internal VREF generator. |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel analog multiplexer | Supports sequential sampling of four sensors (e.g., temp, pressure, voltage, current) with <65dB channel-to-channel crosstalk. |
| Software-configurable input modes | Single-ended or differential, unipolar or bipolar - selectable per conversion via command byte, eliminating external op-amp reconfiguration. |
| SPI/QSPI/MICROWIRE/TMS320 interface | Direct connection to microcontrollers and DSPs without glue logic; SSTRB enables synchronous timing with TMS320 C-series processors. |
| Low-power shutdown | Reduces supply current to 1µA in full power-down mode; auto-shutdown after conversion cuts average current to <60µA at low sampling rates. |
| QSOP-16 package | Same board area as 8-pin SOIC - allows migration from legacy 8-pin ADCs while adding 4-channel capability and serial interface. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and barometric pressure every 10 seconds. IC Role / Device Role / Timing Role: 4-channel ADC digitizes conditioned analog outputs from multiple transducers; uses external 2.5V reference for stable full-scale accuracy across temperature. Use Value: 1.2mA active current and 1µA shutdown enable >1-year operation on two AA alkaline cells; QSOP-16 footprint minimizes PCB area. |
Use Scenario: Handheld ECG monitor acquiring lead-I, II, III signals with simultaneous respiration measurement. IC Role / Device Role / Timing Role: Configured in differential mode for noise-rejecting biopotential measurements; COM tied to Wilson central terminal; SSTRB synchronized to DSP processing cycle. Use Value: ±0.5 LSB INL ensures diagnostic-grade amplitude fidelity; 1.5µs acquisition supports fast lead switching between beats. |
| Pen Digitizers | Battery-Powered Test Equipment |
Use Scenario: Active stylus interface in tablet PCs measuring X/Y position via resistive or capacitive grid voltage division. IC Role / Device Role / Timing Role: Samples four analog grid voltages sequentially; unipolar mode maps 0–2.5V to 0–4095; software selects channel per coordinate axis. Use Value: 133ksps throughput enables sub-millisecond coordinate updates; low 1.2mA supply current extends stylus battery life. |
Use Scenario: Portable multimeter with voltage, current, and resistance measurement functions using shared analog front-end. IC Role / Device Role / Timing Role: Reconfigures input range and polarity per measurement type (e.g., bipolar for AC voltage, unipolar for DC current shunt); VREF driven by precision bandgap. Use Value: Single IC replaces multiple dedicated converters; external reference ensures <0.1% gain error stability over 0–70°C operating range. |
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 |
|---|---|---|---|
| MAX1246ACEE+T | Includes internal 2.5V reference; narrower supply range (+2.7V to +3.6V); same pinout and command set. | Eliminates external reference component but limits system supply flexibility; unsuitable for 5V-only systems. | Select MAX1246ACEE+T only if board space constraints prohibit external reference and system operates strictly at 3.3V. |
| ADS7822U | TI 12-bit SAR ADC; 200ksps; SPI interface; internal reference; 8-pin SOIC package (smaller footprint). | Lacks multiplexer - single-channel only; no differential mode; lower power (1.25mW @ 200ksps) but no software-configurable input polarity. | Choose ADS7822U for cost-sensitive, single-signal applications where channel count and bipolar support are not required. |
Compared with MAX1246ACEE+T and ADS7822U, MAX1247ACEE+T uniquely balances wide-supply operation, external reference flexibility, 4-channel multiplexing, and differential input capability - making it optimal for multi-sensor, battery-powered systems requiring field-replaceable reference calibration.
Availability
MAX1247ACEE+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 guaranteed traceable sourcing.
Supply support for MAX1247ACEE+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 portable applications.
The MAX1246/MAX1247 family was designed for low-power, multi-channel data acquisition in space- and energy-constrained systems - emphasizing software configurability, minimal external components, and robust serial interfacing.
FAQ
What is the reference architecture of the MAX1247ACEE+T?
The MAX1247ACEE+T requires an external reference voltage applied to the VREF pin and does not include an internal reference. Its reference buffer must be disabled by tying REFADJ to VDD. This architecture allows designers to select high-accuracy, low-drift external references (e.g., REF5025) to meet tight system-level gain error budgets - unlike the MAX1246ACEE+T, which integrates a 2.5V reference.
Does the MAX1247ACEE+T support differential input mode?
Yes, the MAX1247ACEE+T supports true pseudo-differential input mode via software configuration. Setting SGL/DIF = 0 in the command byte selects differential pairs: CH0/CH1 and CH2/CH3. In this mode, the device samples the voltage difference between the two inputs, rejecting common-mode noise - critical for biopotential and industrial sensor applications where signal integrity is paramount.
What is the function of the SHDN pin on the MAX1247ACEE+T?
The SHDN pin on the MAX1247ACEE+T provides three-level control: pulled low → full power-down (1µA supply current); pulled high → enables internal compensation for external reference buffering; left floating → enables external compensation mode. This flexibility allows optimized power management and reference stability tuning without additional external components.
Can the MAX1247ACEE+T operate with a 5V supply?
Yes, the MAX1247ACEE+T is fully specified for operation from +2.7V to +5.25V, making it compatible with standard 5V logic systems. At VDD = 5.25V, it maintains 12-bit performance with ±0.5 LSB INL (max), 133ksps sampling rate, and 1.2mA supply current - enabling direct integration into legacy 5V industrial controllers without level-shifting circuitry.
Is the MAX1247ACEE+T pin-compatible with other devices in the MAX1246/MAX1247 family?
Yes, all MAX1246/MAX1247 variants in QSOP-16 packaging - including MAX1247ACEE+T, MAX1246ACEE+T, and MAX1247BCEE+T - share identical pinouts and command structures. This allows hardware reuse across designs with different temperature grades (e.g., 0°C to +70°C vs. -40°C to +85°C) or reference architectures, simplifying BOM consolidation and design iteration.
MAX1247ACEE+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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1247ACEE+T FAQ
1.How can I place an order for MAX1247ACEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1247ACEE+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 MAX1247ACEE+T reliable?
The price and inventory of MAX1247ACEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1247ACEE+T is usually 5 days.
3.What payment methods are accepted for MAX1247ACEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1247ACEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1247ACEE+T?
MAX1247ACEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1247ACEE+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 MAX1247ACEE+T?
For technical support, including MAX1247ACEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1247ACEE+T requirements.
6.How does Aetrix verify that MAX1247ACEE+T is sourced from the original manufacturer or authorized distributors?
All MAX1247ACEE+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 MAX1247ACEE+T meets industry standards.
7.What is the process for return or replacement of MAX1247ACEE+T?
All MAX1247ACEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1247ACEE+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 MAX1247ACEE+T part is unused and in its original packaging.
Return procedure for MAX1247ACEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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