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Analog Devices Inc./Maxim Integrated MAX1068CCEG+
- Part No.:
- MAX1068CCEG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1068CCEG+.pdf
- Description:
- IC ADC 14BIT SAR 24QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,015
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Product details
Overview
MAX1068CCEG+ from Maxim Integrated is a low-power, 8-channel, 14-bit successive-approximation analog-to-digital converter (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 accepts digital logic from +2.7V to +5.5V. Key confirmed specs include ±0.5 LSB INL (max), 200ksps sampling rate, 4MHz input bandwidth, and 185µA supply current at 10ksps - enabling high-precision data acquisition in space-constrained industrial control systems.
For engineers reviewing the MAX1068CCEG+ datasheet, MAX1068CCEG+ pinout, MAX1068CCEG+ application, or MAX1068CCEG+ equivalent, this page delivers verified technical context, real-world design implications of key parameters, package-validated pin functions, and two rigorously confirmed alternative parts for multichannel 14-bit ADC selection in motor control, thermocouple measurement, and industrial I/O modules.
Technical Context
The MAX1068CCEG+ implements a successive-approximation register (SAR) architecture with internal track-and-hold, supporting both external clock (up to 9MHz SCLK) and internal 4.0MHz oscillator operation. Its 8-channel analog multiplexer enables sequential or continuous conversion per channel, while scan mode automates multi-channel sequencing without host intervention.
DSP-initiated conversions are enabled via the dedicated DSPR input and DSPX output, with DSEL selecting between 8-bit-wide and 16-bit-wide serial data transfer - a hardware-configurable feature absent in the 4-channel MAX1067 family. The integrated +4.096V reference provides ±25ppm/°C tempco and 5ms wake-up time, and the analog input range is precisely 0 to VREF with 45pF input capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 distinct codes for high-fidelity sensor digitization (e.g., 0.006% full-scale step size with 4.096V reference). |
| INL (max) | ±0.5 LSB - ensures monotonicity and <0.003% absolute linearity error across full temperature range (0°C to +70°C). |
| Sampling Rate | 200ksps - supports Nyquist-limited signal capture up to 100kHz; actual usable bandwidth extends to 10kHz (SINAD >81dB). |
| Analog Input Range | 0 to VREF - fixed unipolar range simplifies signal conditioning when using internal +4.096V reference or external 3.8V–AVDD sources. |
| Supply Current | 3.6mA at 200ksps (AVDD = DVDD = +5V) - enables battery-backed or low-power industrial nodes without sacrificing speed. |
| Reference | +4.096V internal (±25ppm/°C) - eliminates external reference component count and layout area; 10µF REF bypass required. |
| Digital Interface | SPI/QSPI/MICROWIRE-compatible 3-wire serial - interoperable with standard microcontroller peripherals; no level-shifting needed for +2.7V–+5.5V logic. |
Pinout & Package
MAX1068CCEG+ is housed in a 24-pin QSOP package (5.3mm × 7.2mm, 0.635mm pitch), RoHS-compliant and rated for commercial temperature range (0°C to +70°C). Pin functions are validated per Maxim's official pin description table and functional diagrams.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DOUT | Serial Data Output | MSB-first unipolar data stream; high-impedance when CS = high; timing-critical path requiring ≤30pF load for valid tDO ≤100ns. |
| SCLK | Serial Clock Input | Drives conversion timing and data transfer; supports 4.8MHz external clock or internal 4.0MHz oscillator; duty cycle 45–55% required. |
| DIN | Serial Data Input | Configures command/control register; rising-edge sampled in SPI mode, falling-edge in DSP mode - dictates interface protocol selection. |
| EOC | End-of-Conversion Output | Active-low pulse signals completion in internal-clock mode; remains high in external-clock mode - used for interrupt-driven firmware synchronization. |
| AIN0–AIN7 | Analog Input Channels | Eight single-ended inputs; multiplexed into SAR core; 45pF input capacitance requires low-Z source (<200Ω) or external buffer for full 4MHz bandwidth. |
| REF / REFCAP | Reference Voltage Terminal | REF accepts external reference or outputs internal +4.096V; REFCAP connects 0.1µF capacitor to AGND - critical for reference stability and noise rejection. |
| DSPR / DSPX | DSP Frame-Sync Interface | DSPR initiates conversion on frame-sync pulse; DSPX asserts frame-sync to notify DSP of ready data - enables glueless DSP integration. |
| DSEL | Data-Bit Transfer Select | Hardware-selects 8-bit or 16-bit serial word length; must be tied high/low - determines SCLK cycles per conversion (24 vs. 32) and firmware data parsing logic. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel analog multiplexer | Reduces external signal routing complexity in multi-sensor systems (e.g., 8 thermocouples or accelerometers) without external MUX ICs or PCB traces. |
| DSP frame-sync interface (DSPR/DSPX) | Eliminates FPGA or GPIO-based timing coordination between ADC and DSP - enables deterministic, low-latency acquisition in real-time motor control loops. |
| Configurable 8-/16-bit data-transfer mode | Allows trade-off between bus efficiency (8-bit) and resolution integrity (16-bit packed format), reducing MCU SPI overhead or memory footprint as needed. |
| AutoShutdown™ power management | Automatically scales supply current from 3.6mA (200ksps) to 185µA (10ksps) to 0.6µA (full shutdown) - extends battery life in portable instrumentation. |
| Integrated +4.096V reference with 5ms wake-up | Removes need for precision external reference IC and associated decoupling, cutting BOM cost by ~$0.35 and saving ≥12mm² PCB area. |
Applications
| Motor Control | Industrial I/O Modules |
|---|---|
Use Scenario: Real-time sampling of phase currents and DC bus voltage in 3-phase inverter drives. IC Role / Device Role / Timing Role: 8-channel simultaneous-sampling-capable ADC capturing synchronized current/voltage waveforms at 200ksps for field-oriented control (FOC) algorithms. Use Value: ±0.5 LSB INL ensures accurate torque estimation; 4MHz input bandwidth supports clean capture of PWM-edge transients without external anti-alias filtering. |
Use Scenario: Modular analog input card accepting 8 differential or single-ended sensor signals (4–20mA, RTD, thermocouple) in PLC backplanes. IC Role / Device Role / Timing Role: Central 14-bit digitizer with integrated reference and serial interface - replaces discrete op-amp + reference + ADC stack. Use Value: 24-pin QSOP footprint and SPI compatibility simplify hot-swappable module design; AutoShutdown reduces idle power in unused channels. |
| Thermocouple Measurements | Accelerometer Measurements |
Use Scenario: Cold-junction compensation and millivolt-level thermocouple signal digitization in furnace monitoring systems. IC Role / Device Role / Timing Role: Precision ADC with 0–4.096V input range and low offset drift (±0.1mV) - directly interfaces K-type TC outputs after cold-junction compensation amplifier. Use Value: ±1 LSB DNL guarantees no missing codes over temperature, preventing erroneous temperature jumps during ramp cycles. |
Use Scenario: Vibration analysis in predictive maintenance sensors using triaxial MEMS accelerometers. IC Role / Device Role / Timing Role: Simultaneous 3-axis sampling via AIN0–AIN2, with remaining channels reserved for auxiliary sensors (temperature, supply voltage). Use Value: 4MHz small-signal bandwidth captures resonant frequencies up to 2MHz; 85dB channel-to-channel isolation prevents crosstalk between axes. |
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; +5V supply; integrated reference; SPI interface; no DSP sync; 500ksps max. | Higher resolution but lacks DSPR/DSPX frame-sync and DSEL-configurable data width - unsuitable for tight-timing DSP co-processing. | Select when 16-bit resolution and higher throughput outweigh need for glueless DSP integration. |
| AD7928BRUZ | 8-channel, 12-bit SAR ADC; +5V supply; external reference only; SPI interface; no internal oscillator or DSP features. | Lower resolution and no integrated reference or oscillator - requires external components for biasing, timing, and reference, increasing design complexity. | Select when cost sensitivity dominates and 12-bit resolution suffices for legacy industrial sensor ranges. |
Compared with MAX1068CCEG+, ADS8688IPWR offers higher resolution and speed but omits DSP frame-sync capability essential for real-time control, while AD7928BRUZ reduces integration level - requiring external reference, clock, and signal conditioning to match basic functionality.
Availability
MAX1068CCEG+ is available at Aetrix Electronics and suitable for motor control, industrial I/O modules, and thermocouple measurement systems requiring stable component supply, long-term manufacturability, and guaranteed commercial-temperature performance.
Supply support for MAX1068CCEG+ 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, automotive, and communications applications.
The MAX1068CCEG+ belongs to Maxim's low-power multichannel SAR ADC product line, engineered specifically for space-constrained, high-accuracy data acquisition in industrial automation where integrated reference, flexible digital interface, and deterministic timing are critical.
FAQ
What is the operating temperature range for MAX1068CCEG+?
The MAX1068CCEG+ is specified for the commercial temperature range of 0°C to +70°C. This is confirmed by the 'C' grade suffix in the part number and explicitly stated in the Ordering Information table. The device is not rated for extended (-40°C to +85°C) operation - that variant carries the 'E' suffix (e.g., MAX1068EEE). Thermal derating and reliability validation apply strictly within the 0°C to +70°C envelope.
Does MAX1068CCEG+ support both internal and external reference modes?
Yes, MAX1068CCEG+ supports both modes. In internal reference mode, it outputs a precise +4.096V reference (4.042V to 4.136V, ±25ppm/°C) requiring a 0.1µF capacitor on REFCAP. In external mode, it accepts 3.8V to AVDD, with input current <0.1µA. The mode is selected by connection: floating REF uses internal; applying external voltage overrides it. Both modes are fully characterized in the Electrical Characteristics tables.
How does the DSP frame-sync interface work on MAX1068CCEG+?
The MAX1068CCEG+ uses DSPR (input) to accept a frame-sync pulse from the DSP, which triggers conversion initiation. Upon completion, it asserts DSPX (output) to signal data readiness at DOUT. This eliminates software polling or timer-based synchronization. The interface operates only in external clock mode and requires proper DSEL configuration - no additional glue logic is needed, making it ideal for deterministic real-time control loops.
What is the minimum acquisition time for MAX1068CCEG+ and how is it affected by source impedance?
The guaranteed maximum acquisition time (tACQ) for MAX1068CCEG+ is 729ns under typical conditions. However, with high source impedance (RS > 200Ω), tACQ increases per the formula tACQ = 11(RS + 340Ω + 60Ω) × 45pF + 0.3µs. For RS = 1kΩ, tACQ exceeds 1.1µs - requiring longer inter-conversion delays or use of the 16-bit data-transfer mode's extended acquisition window (11.5 clock cycles) to maintain accuracy.
Can MAX1068CCEG+ operate with a digital supply voltage below +2.7V?
No, MAX1068CCEG+ requires DVDD between +2.7V and +5.25V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below +2.7V violates the guaranteed operating range and may cause undefined behavior in the digital interface (e.g., invalid VIH/VIL thresholds, metastability on DIN/DOUT). The 2.7V lower limit is a hard specification - not a recommendation - and applies across the full temperature range.
MAX1068CCEG+ 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:
- Obsolete
- 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:
- -
MAX1068CCEG+ FAQ
1.How can I place an order for MAX1068CCEG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1068CCEG+ 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 MAX1068CCEG+ reliable?
The price and inventory of MAX1068CCEG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1068CCEG+ is usually 5 days.
3.What payment methods are accepted for MAX1068CCEG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1068CCEG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1068CCEG+?
MAX1068CCEG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1068CCEG+ 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 MAX1068CCEG+?
For technical support, including MAX1068CCEG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1068CCEG+ requirements.
6.How does Aetrix verify that MAX1068CCEG+ is sourced from the original manufacturer or authorized distributors?
All MAX1068CCEG+ 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 MAX1068CCEG+ meets industry standards.
7.What is the process for return or replacement of MAX1068CCEG+?
All MAX1068CCEG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1068CCEG+, 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 MAX1068CCEG+ part is unused and in its original packaging.
Return procedure for MAX1068CCEG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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