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Analog Devices Inc./Maxim Integrated MAX1068BCEG+
- Part No.:
- MAX1068BCEG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1068BCEG+.pdf
- Description:
- IC ADC 14BIT 200KSPS 24-QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,122
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Product details
Overview
MAX1068BCEG+ from Maxim Integrated is a low-power, 8-channel, 14-bit successive-approximation ADC with integrated +4.096V reference, internal oscillator, SPI/QSPI/MICROWIRE-compatible interface, and DSP frame-sync support. It operates from a single +5V analog supply and a separate +2.7V to +5.5V digital supply, delivering 200ksps sampling rate with ±1 LSB INL and 84dB SINAD at 1kHz - ideal for industrial I/O modules requiring high channel density and low power in space-constrained designs.
For engineers reviewing the MAX1068BCEG+ datasheet, MAX1068BCEG+ pinout, MAX1068BCEG+ application, or MAX1068BCEG+ equivalent, key selection considerations include its 24-pin QSOP package, 8-analog-input multiplexer, dual data-transfer modes (8-/16-bit), AutoShutdown™ current reduction to 185µA at 10ksps, and guaranteed operation from –40°C to +85°C.
Technical Context
The MAX1068BCEG+ implements a successive-approximation register (SAR) architecture with internal track-and-hold (4MHz input bandwidth) and supports both external clock (up to 9MHz SCLK) and internal 4.0MHz oscillator. Its analog front-end accepts inputs from 0 to VREF (internal +4.096V or external 3.8V–AVDD), with channel-to-channel isolation of 85dB and aperture jitter <50ps.
Digital interface flexibility includes three operational modes: standard SPI/QSPI/MICROWIRE, DSP-initiated conversion via DSPR/DSPX signals, and scan mode for sequential or continuous single-channel conversion. The DSEL pin selects between 8-bit-wide (200ksps max) and 16-bit-wide (150ksps max) serial data transfer - directly impacting timing budget and microcontroller firmware design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit SAR ADC - delivers 16,384 distinct output codes for high-precision sensor digitization. |
| Sampling Rate | 200ksps with external clock - enables real-time capture of fast transients in motor control feedback loops. |
| INL / DNL | ±1 LSB max INL, no missing codes DNL - ensures monotonicity and linearity critical for closed-loop control accuracy. |
| Reference | +4.096V internal reference (±25ppm/°C TC) - eliminates external reference component count and layout area. |
| Supply Current | 3.6mA at 200ksps (AVDD = DVDD = +5V), 185µA at 10ksps - supports battery-powered or thermally constrained systems. |
| Input Channels | 8-channel analog multiplexer - reduces system BOM by consolidating multiple sensor inputs into one IC. |
| Interface | SPI/QSPI/MICROWIRE-compatible 3-wire serial + DSPR/DSPX - enables direct connection to TI C2000 or ADI SHARC without glue logic. |
Pinout & Package
MAX1068BCEG+ is housed in a 24-pin QSOP package (5.3mm × 7.6mm, 0.635mm pitch), optimized for automated assembly and thermal performance in industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DOUT | Serial Data Output | MSB-first unipolar data output; high-impedance when CS = high - simplifies bus sharing and reduces loading on host MCU. |
| SCLK | Serial Clock Input | Drives conversion timing and clocks data; supports up to 9MHz - sets maximum achievable throughput in SPI mode. |
| DIN | Serial Data Input | Configures command/control register; rising-edge sampled in SPI mode - enables dynamic range or channel selection changes mid-operation. |
| EOC | End-of-Conversion Output | Active-low pulse in internal clock mode; remains high in external clock - provides hardware interrupt signaling for deterministic latency. |
| AIN0–AIN7 | Analog Input Channels | Eight single-ended inputs referenced to AGND; each with 45pF input capacitance - requires careful driver selection for >1kΩ source impedances. |
| REF / REFCAP | Reference Voltage Terminal | Accepts internal +4.096V or external reference; REFCAP requires 0.1µF bypass - ensures stable full-scale voltage under dynamic load. |
| DSPR / DSPX | DSP Frame-Sync Interface | DSPR initiates conversion on frame-sync pulse; DSPX signals data readiness - enables synchronous multi-ADC sampling in DSP-based motor drives. |
| DSEL | Data-Bit Transfer Select | Logic-high = 16-bit mode (150ksps); logic-low = 8-bit mode (200ksps) - allows trade-off between resolution, speed, and host processor bit-width constraints. |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ | Reduces total supply current to 185µA at 10ksps and <10µA at lower rates - extends battery life in portable data loggers without software intervention. |
| Integrated Reference | +4.096V internal reference with ±25ppm/°C drift and 5ms wake-up time - eliminates external reference IC, trimming resistors, and associated layout complexity. |
| Scan Mode | Automatically sequences through all 8 channels or continuously samples one - enables efficient polling of distributed sensors without host CPU overhead. |
| DSP Frame-Sync Support | DSPR/DSPX pins enable hardware-triggered conversions synchronized to DSP frame clocks - critical for deterministic timing in servo control algorithms. |
| Adjustable Logic Level | Digital I/O compatible with +2.7V to +5.5V logic - allows direct interfacing with 3.3V microcontrollers or 5V FPGAs without level shifters. |
Applications
| Motor Control | Industrial I/O Modules |
|---|---|
|
Use Scenario: Real-time acquisition of current-sense shunt voltages and encoder feedback in 3-phase BLDC motor drives. IC Role / Device Role / Timing Role: 8-channel simultaneous sampling (via scan mode) of phase currents and position signals with <50ps aperture jitter. Use Value: Enables precise field-oriented control (FOC) with 14-bit resolution across all channels, reducing torque ripple and improving efficiency. |
Use Scenario: Consolidated analog input for programmable logic controller (PLC) remote I/O terminals handling temperature, pressure, and flow sensors. IC Role / Device Role / Timing Role: Centralized 14-bit digitization of up to eight 4–20mA or 0–10V sensor inputs with integrated reference and low power. Use Value: Eliminates eight discrete ADCs and reference circuits, cutting board area by >40% and simplifying calibration across channels. |
| Thermocouple Measurements | Accelerometer Measurements |
|
Use Scenario: Cold-junction compensation and millivolt-level thermocouple signal digitization in industrial furnace controllers. IC Role / Device Role / Timing Role: High-accuracy 14-bit conversion with ±1 LSB INL and 84dB SINAD at 1kHz - preserves small-signal fidelity of Type-K/J thermocouples. Use Value: Achieves ±0.5°C measurement accuracy without external amplification or precision external reference, lowering system cost. |
Use Scenario: Vibration monitoring using MEMS accelerometers in predictive maintenance edge nodes. IC Role / Device Role / Timing Role: Digitizes broadband accelerometer outputs (DC–10kHz) with 4MHz input bandwidth and 200ksps sampling. Use Value: Captures transient shock events and harmonic content for FFT-based fault detection without aliasing or gain error distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel, 14-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8688IPWR | 8-channel, 16-bit SAR ADC; external reference required; 500ksps max; no integrated oscillator or DSP sync. | Better resolution but higher power (12.5mW vs. 18mW at 200ksps); lacks AutoShutdown™ and internal reference. | Choose when 16-bit resolution and higher throughput outweigh added BOM complexity and power budget. |
| AD7606BSTZ | 8-channel, 16-bit simultaneous-sampling SAR ADC; ±10V/±5V input range; parallel + SPI interface; no internal reference. | Supports bipolar inputs and true simultaneous sampling; larger 64-lead LQFP package; requires external reference and power sequencing. | Prefer for applications needing bipolar signal acquisition or strict channel synchronization - not drop-in compatible. |
Compared with ADS8688IPWR and AD7606BSTZ, the MAX1068BCEG+ offers lowest system-level integration (reference + oscillator + DSP sync + AutoShutdown™) in a compact 24-pin QSOP, making it optimal for cost- and space-sensitive industrial embedded designs where 14-bit resolution suffices.
Availability
MAX1068BCEG+ is available at Aetrix Electronics and suitable for industrial process control, motor control, and data-acquisition systems requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long-term production continuity.
Supply support for MAX1068BCEG+ 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 and mixed-signal ICs for industrial, automotive, and communications applications, emphasizing integration, reliability, and low-power operation.
The MAX1068BCEG+ belongs to Maxim's multichannel precision ADC product line, engineered specifically for space-constrained industrial control systems needing high channel count, integrated references, and flexible digital interfaces without sacrificing accuracy or power efficiency.
FAQ
What is the operating temperature range for the MAX1068BCEG+?
The MAX1068BCEG+ is specified for operation from –40°C to +85°C (extended temperature range), with full performance guarantees including ±1 LSB INL, 200ksps sampling, and AutoShutdown™ functionality across this range. This makes MAX1068BCEG+ suitable for deployment in harsh industrial environments such as factory automation and outdoor equipment.
Does the MAX1068BCEG+ require an external reference voltage?
No - the MAX1068BCEG+ integrates a precision +4.096V reference with ±25ppm/°C temperature coefficient and 5ms wake-up time. External reference mode is optional and supports 3.8V to AVDD, but using the internal reference eliminates two external components (reference IC and decoupling capacitor) and reduces layout area, which is confirmed in the device's Electrical Characteristics table and Pin Description section.
How does the DSEL pin affect MAX1068BCEG+ operation?
The DSEL pin on the MAX1068BCEG+ selects data-transfer width: logic low enables 8-bit mode (200ksps max), logic high enables 16-bit mode (150ksps max). This directly impacts host MCU firmware design - 8-bit mode suits 8-bit microcontrollers or bandwidth-limited buses, while 16-bit mode preserves full 14-bit resolution without post-processing. Leaving DSEL unconnected is prohibited per the datasheet.
Can the MAX1068BCEG+ interface directly with a TI C2000 DSP?
Yes - the MAX1068BCEG+ supports direct hardware synchronization with TI C2000 DSPs via its dedicated DSPR (frame-sync receive) and DSPX (frame-sync transmit) pins. When configured in DSP mode, a frame-sync pulse on DSPR initiates conversion, and DSPX asserts upon result availability - enabling deterministic, low-latency sampling without software polling or external logic, as verified in the Operating Modes and Timing Characteristics sections.
What is the minimum acquisition time for the MAX1068BCEG+?
The MAX1068BCEG+ has a guaranteed minimum acquisition time (tACQ) of 729ns under external clock conditions, as specified in the Electrical Characteristics table. This value assumes a source impedance ≤200Ω; for higher impedances, tACQ increases per the formula tACQ = 11(RS + 340Ω + 60Ω) × 45pF + 0.3µs - critical for maintaining accuracy in high-impedance sensor interfaces like thermocouples.
MAX1068BCEG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 4
- Input Type:
- 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, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1068BCEG+ FAQ
1.How can I place an order for MAX1068BCEG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1068BCEG+ 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 MAX1068BCEG+ reliable?
The price and inventory of MAX1068BCEG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1068BCEG+ is usually 5 days.
3.What payment methods are accepted for MAX1068BCEG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1068BCEG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1068BCEG+?
MAX1068BCEG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1068BCEG+ 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 MAX1068BCEG+?
For technical support, including MAX1068BCEG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1068BCEG+ requirements.
6.How does Aetrix verify that MAX1068BCEG+ is sourced from the original manufacturer or authorized distributors?
All MAX1068BCEG+ 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 MAX1068BCEG+ meets industry standards.
7.What is the process for return or replacement of MAX1068BCEG+?
All MAX1068BCEG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1068BCEG+, 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 MAX1068BCEG+ part is unused and in its original packaging.
Return procedure for MAX1068BCEG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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