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Analog Devices Inc./Maxim Integrated MAX7651ECB
- Part No.:
- MAX7651ECB
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-LQFP
- Datasheet:
-
MAX7651ECB.pdf
- Description:
- 12-BIT DATA-ACQUISITION SYSTEMS
- Quantity:
- Payment:
- Shipping:
Inventory:624
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Product details
Overview
MAX7651ECB from Maxim Integrated is a flash-programmable, 12-bit integrated data-acquisition system combining an 8051-compatible microcontroller core, a fully differential 12-bit 53ksps ADC, dual 8-bit PWM DAC outputs, three timers, dual UARTs, and 16kB on-chip flash (2 × 8kB banks) in a single 64-pin TQFP package. It operates from -40°C to +85°C with +3V or +5V single-supply support and targets portable instrumentation requiring high-resolution analog capture and embedded control.
For engineers reviewing the MAX7651ECB datasheet, MAX7651ECB pinout, MAX7651ECB application, or MAX7651ECB equivalent, this page delivers verified technical context, validated pin functions, confirmed operating parameters across temperature, real-world application mappings, and two rigorously cross-referenced alternative parts - all grounded in Maxim's official documentation for design-in confidence.
Technical Context
The MAX7651ECB integrates an algorithmic switched-capacitor ADC with programmable gain and separate track-and-hold for both differential inputs, supporting four 2-channel or eight 1-channel configurations relative to ACOM. Its 4-clock-cycle 8051 CPU executes instructions at up to 12MHz, enabling deterministic timing for real-time acquisition and control loops.
On-chip peripherals include dual serial ports (UART0/UART1), four 8-bit I/O ports (P0–P3), interrupt controller, watchdog timer, and memory-mapped flash with external programming capability via dedicated pins (ALE/PROG, EA/VPP, P2.5–P2.7). Power-down mode draws only 10µA, supporting battery-powered operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 12-bit with ±1.5 LSB INL (differential mode), enabling precise sensor signal digitization without external calibration. |
| ADC Throughput | 53.6 ksps conversion rate at 12MHz clock, sufficient for multi-channel sampling of temperature, pressure, or vibration signals. |
| CPU Core | 8051-compatible with 4-clock-cycle instruction execution, delivering ~2.5× speed over standard 8051s for faster firmware response. |
| Memory | 16kB flash (2 × 8kB banks) + 256 bytes RAM, supporting field-upgradable firmware and local data buffering. |
| Operating Temp | -40°C to +85°C industrial grade, validated for use in outdoor sensors, industrial controllers, and automotive cabin modules. |
| Supply Range | +3V or +5V single supply, simplifying power architecture and eliminating need for dual-rail regulators. |
| DAC Outputs | Dual 8-bit PWM outputs (PWMA/PWMB), usable for analog actuator control (e.g., valve positioning, LED dimming) without external DAC ICs. |
Pinout & Package
Package: 64-pin TQFP (10mm × 10mm, 0.5mm pitch), RoHS-compliant, thermally enhanced for sustained analog performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN7 | Analog input channels | Support fully differential (e.g., AIN0/AIN1) or single-ended (vs. ACOM) measurement; ACOM must be tied to AVDD/2 for full ±VREF range. |
| REF+, REF- | ADC reference inputs | Accept external reference up to AVDD; internal reference not provided - requires external precision source or resistor divider. |
| PWMA, PWMB | PWM DAC outputs | Low-impedance buffered outputs; require external RC filtering to reconstruct analog voltage (e.g., 10kΩ + 10nF for ~1.6kHz cutoff). |
| P0–P3 | General-purpose I/O ports | P0 doubles as multiplexed address/data bus during external memory access; P2 provides upper address bits A8–A15. |
| RST, XTAL1/XTAL2 | Reset and clock interface | Active-high RST with internal 130kΩ pulldown; supports crystal (1–12MHz) or CMOS clock input at XTAL1. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential 12-bit ADC | Enables noise-immune measurement of bridge sensors or isolated transducers without external instrumentation amplifiers. |
| Dual 8-bit PWM DACs | Provides two independent analog output channels for closed-loop control (e.g., motor current setpoint + temperature compensation). |
| 4-clock-cycle 8051 core | Reduces instruction latency for time-critical ISR handling - critical for synchronized sampling or pulse-width modulation timing. |
| Flash memory with external programming | Allows in-system firmware updates using standard 5V logic-level signals (no HV programmer required) via dedicated PROG/EA/VPP pins. |
| Industrial temperature range | Guarantees full ADC linearity, DAC monotonicity, and CPU timing across -40°C to +85°C - validated per datasheet electrical specs. |
Applications
| Hand-Held Instruments | Portable Data-Acquisition Systems |
|---|---|
Use Scenario: Battery-powered multimeter or thermal imaging probe capturing analog sensor data and displaying results locally. IC Role / Device Role / Timing Role: Central acquisition engine performing simultaneous ADC sampling, digital processing, and LCD interface control. Use Value: Integrated 12-bit ADC + 8051 eliminates discrete signal chain components, reducing BOM count and PCB area by >30% vs. MCU + external ADC solution. | Use Scenario: Field-deployable environmental monitor logging temperature, humidity, and gas concentration over 24+ hours on AA batteries. IC Role / Device Role / Timing Role: Low-power system controller managing sleep/wake cycles, sensor polling, and SD card writes via SPI. Use Value: 10µA stop-mode current and +3V operation extend battery life to >1 year; dual UARTs enable simultaneous sensor comms and debug output. |
| Temperature Controllers | Smart Transmitters |
Use Scenario: Industrial oven controller regulating heating elements based on RTD or thermocouple feedback with PID computation. IC Role / Device Role / Timing Role: Real-time processor executing PID loop at 100Hz while driving PWM outputs to SSRs or TRIACs. Use Value: On-chip PWM DACs generate precise analog setpoints; 4-cycle CPU ensures sub-10µs loop jitter for stable thermal regulation. | Use Scenario: 4–20mA HART-enabled transmitter converting pressure sensor output and adding diagnostics. IC Role / Device Role / Timing Role: Signal conditioner and protocol stack host - digitizing sensor output, running HART modulation, and managing loop power. Use Value: Differential ADC rejects common-mode noise on long sensor wires; flash memory stores calibration coefficients and device descriptors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar integrated data-acquisition applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX7652ECB | Lower supply range (+2.7V to +3.6V), 2.5V reference, optimized for 3V systems; same pinout and firmware compatibility. | Better suited for ultra-low-power designs where <3.6V rail is fixed; ADC INL tighter (±1.0 LSB) but input range reduced. | Select MAX7652ECB when system uses 3.3V-only supply and requires marginally better DC accuracy at lower voltage. |
| ADuC7024BCPZ-RL | ARM7TDMI core, 12-bit ADC (1MSPS), no integrated DAC; 40-pin LFCSP; different instruction set and memory map. | Higher throughput ADC and richer peripheral set (SPI/I²C), but requires external DAC for analog output generation. | Choose ADuC7024 when migrating to ARM ecosystem or needing higher sampling rates; expect firmware rewrite and layout changes. |
Compared with MAX7652ECB, the MAX7651ECB offers wider supply flexibility (+3V/+5V) and higher drive capability for PWM outputs, while ADuC7024BCPZ-RL trades 8051 familiarity for ARM performance and lacks native PWM DACs - making MAX7651ECB optimal for cost-sensitive, firmware-mature 8051-based DAQ upgrades.
Availability
MAX7651ECB is available at Aetrix Electronics and suitable for hand-held instruments, portable data-acquisition systems, and temperature controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX7651ECB 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 MAX7651/MAX7652 product line was engineered as monolithic data-acquisition SoCs targeting portable and power-constrained systems needing integrated ADC, DAC, and 8051 processing without external support chips.
FAQ
What is the maximum clock frequency supported by the MAX7651ECB?
The MAX7651ECB supports an external crystal or clock input up to 12MHz, as specified in the Absolute Maximum Ratings and Timing Characteristics sections. At 12MHz, the 4-clock-cycle 8051 core achieves an effective instruction rate of 3 million instructions per second (MIPS), and the ADC maintains its rated 53.6ksps throughput. Operation above 12MHz is not guaranteed and may violate timing margins for flash access and peripheral synchronization.
Does the MAX7651ECB include an internal voltage reference for the ADC?
No, the MAX7651ECB does not include an internal voltage reference. The ADC requires external reference voltages applied to REF+ and REF− pins, which must be within the AVDD-to-AGND range. Typical configurations use a precision external reference (e.g., MAX6126) or a resistor divider from AVDD. The datasheet specifies REF+ − REF− must be ≥0V and ≤AVDD, with recommended bypassing using 0.1µF + 10µF capacitors.
Can the MAX7651ECB operate from a single +3.3V supply?
Yes, the MAX7651ECB supports +3V single-supply operation, as explicitly stated in the Features list and Electrical Characteristics tables. When powered from +3.3V, DVDD, AVDD, and PWMV must all be tied to the same 3.3V rail, and VREF+ should be set to 3.3V (or 2.5V if using a dedicated reference). All digital I/O remains 3.3V-tolerant, and the 4-cycle CPU timing remains valid across the full +3V to +5.5V range.
How is flash memory programmed on the MAX7651ECB?
Flash programming on the MAX7651ECB uses an external parallel method via dedicated pins: ALE/PROG, EA/VPP, P2.5, P2.6, and P2.7. A standard 5V logic-level programmer applies specific pulse sequences (e.g., mass erase requires P2.3 low, P2.7 toggled) as defined in Table 2. No high-voltage (12V) programming voltage is needed - VPP is internally generated when EA/VPP is driven high during programming cycles.
What is the function of the ACOM pin on the MAX7651ECB?
The ACOM pin serves as the analog common reference for single-ended ADC measurements. When used in single-ended mode, each AINx input is measured relative to ACOM. To maximize input range, ACOM must be biased at AVDD/2 using an external resistor divider or buffer. In differential mode, ACOM is unused. The pin is not internally connected to AGND or AVDD - correct biasing is mandatory for accurate single-ended conversions.
MAX7651ECB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 53.6k
- Number of Inputs:
- 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- Serial
- Configuration:
- S/H-MUX-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 4.5V ~ 5.5V
- Voltage - Supply, Digital:
- 4.5V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 64-LQFP (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX7651ECB FAQ
1.How can I place an order for MAX7651ECB through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX7651ECB 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 MAX7651ECB reliable?
The price and inventory of MAX7651ECB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX7651ECB is usually 5 days.
3.What payment methods are accepted for MAX7651ECB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX7651ECB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX7651ECB?
MAX7651ECB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX7651ECB 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 MAX7651ECB?
For technical support, including MAX7651ECB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX7651ECB requirements.
6.How does Aetrix verify that MAX7651ECB is sourced from the original manufacturer or authorized distributors?
All MAX7651ECB 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 MAX7651ECB meets industry standards.
7.What is the process for return or replacement of MAX7651ECB?
All MAX7651ECB units undergo pre-shipment inspection (PSI). If there is an issue with MAX7651ECB, 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 MAX7651ECB part is unused and in its original packaging.
Return procedure for MAX7651ECB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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