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Analog Devices Inc./Maxim Integrated MAX1247BEEE+
- Part No.:
- MAX1247BEEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1247BEEE+.pdf
- Description:
- IC ADC 12BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:144
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Product details
Overview
MAX1247BEEE+ 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 supports external reference input at VREF pin. It is used in portable data loggers and battery-powered medical instruments requiring low-power, high-accuracy signal digitization.
For engineers reviewing the MAX1247BEEE+ datasheet, MAX1247BEEE+ pinout, MAX1247BEEE+ application, or MAX1247BEEE+ equivalent, key selection considerations include its 12-bit resolution, ±1 LSB INL (B-grade), QSOP-16 package, external reference dependency, and shutdown current of 1µA - all critical for precision, low-power embedded sensing systems.
Technical Context
The MAX1247BEEE+ employs successive-approximation register (SAR) architecture with an internal track/hold circuit that acquires input signals in ≤1.5µs. Its analog front-end supports pseudo-differential sampling via CH0–CH3 and COM pins, with configurable input ranges (0V to VREF unipolar or ±VREF/2 bipolar) and channel-to-channel offset matching of ±0.25 LSB.
It uses either an external serial clock (up to 2MHz) or internal clock (0.225MHz typical when SHDN = VDD) for conversion control. The 4-wire serial interface outputs MSB-first data on DOUT at SCLK falling edge and provides SSTRB strobe for TMS320-family DSP synchronization - enabling deterministic timing without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal representation in sensor and instrumentation applications. |
| INL (B-grade) | ±1 LSB - ensures monotonicity and <0.024% full-scale linearity error after calibration, critical for accurate measurement systems. |
| Sampling Rate | 133 ksps (with 2MHz external clock) - supports real-time acquisition of audio-band and industrial control signals. |
| Supply Range | +2.7V to +5.25V - enables direct interfacing with 3.3V and 5V microcontrollers and mixed-voltage systems without level-shifting. |
| Power Consumption | 1.2mA @ 133ksps / 54µA @ 1ksps / 1µA in power-down - allows aggressive duty-cycling in battery-operated devices to extend operational life. |
| Reference Input | External VREF pin (1.0V to VDD+50mV) - requires external precision reference (e.g., 2.5V) for full accuracy; no internal reference. |
| Interface Protocol | SPI/QSPI/MICROWIRE-compatible 4-wire serial - connects directly to standard MCU peripherals without glue logic or protocol translation. |
Pinout & Package
MAX1247BEEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), occupying the same PCB footprint as an 8-pin SO - enabling compact, space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections; decoupling required near pin. |
| CH0–CH3 (Pins 2–5) | Analog input channels | Software-selectable single-ended or differential inputs; source impedance ≤1kΩ recommended for full AC performance. |
| COM (Pin 6) | Analog ground reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB during conversion. |
| SHDN (Pin 7) | Three-level shutdown control | Low = full shutdown (1µA); float = external REFADJ compensation; high = internal REFADJ compensation. |
| AGND (Pin 10) | Analog ground return | Must be separated from DGND and connected to quiet ground plane to minimize noise coupling into ADC core. |
| DGND (Pin 11) | Digital ground return | Return path for digital I/O; tied to AGND at single point near device to avoid ground loops. |
| VREF (Pin 8) | External reference input | Accepts 1.0V–(VDD+50mV); reference buffer disabled by pulling REFADJ to VDD; 18–25kΩ input resistance. |
| REFADJ (Pin 9) | Reference buffer control | Tie to VDD to disable internal reference buffer; otherwise enables ±1.5% VREF adjustment range in MAX1246 (not used in MAX1247). |
| SCLK (Pin 16) | Serial clock input | Drives data transfer and (in external clock mode) SAR conversion; 40–60% duty cycle required; max 2MHz. |
| CS (Pin 15) | Chip select (active-low) | Enables serial interface; DOUT and SSTRB go high-Z when CS is high; controls frame timing for multi-byte transfers. |
| DIN (Pin 14) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; defines channel, polarity, mode, and clock configuration. |
| DOUT (Pin 12) | Serial data output | Outputs 12-bit result MSB-first on SCLK falling edge; high-Z when CS is high; compatible with 3.3V/5V logic levels. |
| SSTRB (Pin 13) | Serial strobe output | Signals conversion start/end: low during conversion (internal clock) or one-cycle pulse before MSB (external clock); syncs to TMS320 DSP. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input modes | Single-ended/differential and unipolar/bipolar operation selected via 8-bit control byte - eliminates hardware reconfiguration for multi-sensor systems. |
| Low-power shutdown states | 1µA full power-down and 54µA fast power-down - enables microcontroller-controlled sleep/wake cycles without external power switches. |
| Track/hold acquisition time | ≤1.5µs - supports accurate sampling of fast transients and permits use with moderate-source-impedance sensors (≤1kΩ) without external buffers. |
| Channel-to-channel matching | ±0.25 LSB offset matching and ±0.25 LSB gain matching - ensures consistent readings across multiplexed channels in data acquisition systems. |
| Anti-aliasing ready analog input | 2.25MHz small-signal bandwidth with internal protection diodes (AGND−0.3V to VDD+0.3V) - allows integration of external RC filters for Nyquist compliance. |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over days. IC Role / Device Role / Timing Role: 4-channel ADC digitizing multiple analog sensor outputs with programmable sampling intervals and automatic power-down between reads. Use Value: 1.2mA active current and 1µA shutdown enable >1-year battery life on coin cell; QSOP-16 footprint minimizes PCB area. |
Use Scenario: Handheld ECG monitor acquiring lead-II differential biopotential signals with high common-mode rejection. IC Role / Device Role / Timing Role: Pseudo-differential ADC converting CH0/CH1 pair in bipolar mode with COM referenced to mid-supply for DC-coupled signal capture. Use Value: ±1 LSB INL and ±0.25 LSB channel matching ensure clinical-grade amplitude accuracy; 133ksps supports >50kHz alias-free bandwidth. |
| Pen Digitizers | Battery-Powered Instruments |
Use Scenario: Resistive touch overlay in tablet detecting stylus position via X/Y electrode voltage scanning. IC Role / Device Role / Timing Role: High-speed 4-channel ADC sequentially sampling four analog electrodes with minimal inter-channel crosstalk (<−85dB). Use Value: 1.5µs acquisition time enables rapid multiplexing; software-selectable unipolar mode matches resistive divider output range (0–VREF). |
Use Scenario: Portable multimeter measuring AC/DC voltage, current, and resistance using shared analog front-end. IC Role / Device Role / Timing Role: Configurable ADC supporting both single-ended (voltage) and differential (shunt-based current) inputs via same hardware interface. Use Value: Single control-byte reconfiguration eliminates need for external multiplexers or op-amp gain switching; 12-bit resolution supports 0.1% measurement accuracy. |
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, SPI-only interface, internal reference, 2.7–5.25V supply, SO-8 package | Lacks differential input support and SSTRB strobe; no REFADJ or COM pin - unsuitable for bipolar or pseudo-differential configurations. | Select when only unipolar single-ended inputs are needed and board space is constrained (SO-8 vs QSOP-16). |
| MAX11131ETE+ | 12-bit, 500ksps, SPI/QSPI, internal 2.048V reference, 2.7–3.6V supply, 12-pin TQFN | Higher speed but narrower supply range; internal reference fixed at 2.048V (not adjustable); no external VREF option. | Select for higher throughput in 3.3V-only systems where external reference flexibility is not required. |
Compared with ADS7822U and MAX11131ETE+, the MAX1247BEEE+ uniquely supports external reference voltage scaling, bipolar input operation, and SSTRB-synchronized DSP interfacing - making it optimal for flexible, low-power, mixed-signal embedded systems requiring field-reconfigurable analog input ranges.
Availability
MAX1247BEEE+ 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 MAX1247BEEE+ 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 MAX1246/MAX1247 family was designed for low-power, high-accuracy data acquisition in space- and energy-constrained systems - emphasizing flexible input configuration, minimal external components, and seamless µP interfacing.
FAQ
What is the reference voltage configuration for MAX1247BEEE+?
The MAX1247BEEE+ requires an external reference voltage applied to the VREF pin (1.0V to VDD+50mV); it has no internal reference. The internal reference buffer is disabled by tying REFADJ to VDD. This design allows precise system-level reference selection - e.g., a 2.5V ultra-low-drift source - ensuring full 12-bit accuracy is maintained across temperature and supply variations in the MAX1247BEEE+.
Does MAX1247BEEE+ support differential input mode?
Yes, the MAX1247BEEE+ supports pseudo-differential input mode via software configuration: SEL2–SEL0 bits select CH0/CH1 or CH2/CH3 pairs, and SGL/DIF = 0 in the control byte enables differential operation. In this mode, the device samples the voltage difference |IN+ − IN−|, with IN− held stable to ±0.5 LSB relative to AGND - a capability confirmed in the MAX1247BEEE+ datasheet's Table 3 and Figure 4.
What is the maximum allowed analog input voltage range for MAX1247BEEE+?
The MAX1247BEEE+ analog inputs (CH0–CH3, COM) tolerate −0.3V to (VDD + 0.3V) continuously per Absolute Maximum Ratings, but for accurate conversion, input voltages must stay within 0V to VREF (unipolar) or ±VREF/2 (bipolar), and must not exceed AGND − 50mV or VDD + 50mV. Exceeding these limits risks forward-biasing internal protection diodes and degrading linearity - a specification explicitly defined in the MAX1247BEEE+ Electrical Characteristics table.
How does the SHDN pin function on MAX1247BEEE+?
The SHDN pin on MAX1247BEEE+ provides three distinct operating states: pulled low → full shutdown (1µA supply current); left floating → external compensation mode for REFADJ (used only with internal reference - not applicable to MAX1247BEEE+); pulled high → internal compensation mode (also unused in MAX1247BEEE+ due to external reference requirement). For MAX1247BEEE+, SHDN is used solely for power gating - a behavior verified in the MAX1247BEEE+ Pin Description and Electrical Characteristics sections.
Is MAX1247BEEE+ pin-compatible with other devices in the MAX1246/MAX1247 family?
Yes, MAX1247BEEE+ is pin-compatible with all MAX1246/MAX1247 variants in QSOP-16 packaging (e.g., MAX1246ACEE+, MAX1247ACEE+), sharing identical pinout, footprint, and interface timing. Differences lie in grade (A/B/C), temperature range (0°C to +70°C for BEEE+), and internal reference presence - but the MAX1247BEEE+ maintains full electrical and mechanical compatibility with other QSOP-16 members of the family.
MAX1247BEEE+ 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:
- 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+ FAQ
1.How can I place an order for MAX1247BEEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1247BEEE+ 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+ reliable?
The price and inventory of MAX1247BEEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1247BEEE+ is usually 5 days.
3.What payment methods are accepted for MAX1247BEEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1247BEEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1247BEEE+?
MAX1247BEEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1247BEEE+ 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+?
For technical support, including MAX1247BEEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1247BEEE+ requirements.
6.How does Aetrix verify that MAX1247BEEE+ is sourced from the original manufacturer or authorized distributors?
All MAX1247BEEE+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX1247BEEE+?
All MAX1247BEEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1247BEEE+, 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+ part is unused and in its original packaging.
Return procedure for MAX1247BEEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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