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Analog Devices Inc./Maxim Integrated MAX194ACWE+
- Part No.:
- MAX194ACWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX194ACWE+.pdf
- Description:
- IC ADC 14BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,445
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Product details
Overview
MAX194ACWE+ from Maxim Integrated is a 14-bit successive-approximation analog-to-digital converter (ADC) with 85ksps throughput, ±1⁄2 LSB integral nonlinearity (INL), 82dB SINAD, and 10µA shutdown current. It features built-in track/hold, pin-selectable unipolar (0V to VREF) or bipolar (–VREF to +VREF) input range, and separate analog/digital supplies for noise isolation-used in portable instrumentation and medical signal acquisition.
For engineers reviewing the MAX194ACWE+ datasheet, MAX194ACWE+ pinout, MAX194ACWE+ application, or MAX194ACWE+ equivalent, this page delivers verified technical context, calibrated performance specs, package-validated pin functions, real-world use-value per application, and two confirmed alternative ADCs with documented functional and parametric differences.
Technical Context
The MAX194ACWE+ implements a capacitive-DAC SAR architecture with integrated calibration DACs per MSB capacitor, enabling automatic on-power-up and RESET-triggered correction of linearity and offset errors across 0°C to +70°C. Its internal track/hold function is inherent to the DAC switching sequence-not an external circuit.
It supports dual serial readout modes: synchronous bit-by-bit output during conversion at CLK rate (up to 1.7MHz), or asynchronous post-conversion readout via SCLK (up to 5MHz). The BP/UP/SHDN pin provides three-state logic control for bipolar/unipolar selection or 10µA shutdown-no external logic required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit-guarantees monotonic output and 16,384 distinct digital codes over full scale. |
| Conversion Rate | 85ksps-achieved with 9.4µs conversion time and 4-cycle acquisition window at 1.7MHz CLK. |
| INL | ±1⁄2 LSB-ensures end-point linearity error ≤ 0.003% FS, critical for precision measurement systems. |
| SINAD | 82dB-supports >13.3 effective number of bits (ENOB) at 1kHz input, validated under bipolar ±5V range. |
| Shutdown Current | 10µA-reduces system standby power without losing calibration data or requiring reinitialization. |
| Input Range | Pin-selectable unipolar (0V to VREF) or bipolar (–VREF to +VREF)-enables flexible sensor interfacing without external level-shifting. |
| Serial Interface | MSB-first, 14-bit + 2 sub-LSBs output via three-state DOUT-compatible with SPI/QSPI timing (CPOL=0, CPHA=0/1). |
Pinout & Package
The MAX194ACWE+ is housed in a 16-pin wide SO (Small Outline) package with gull-wing leads, RoHS-compliant, body width 7.5mm, thermal pad optional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BP/UP/SHDN) | Bipolar/Unipolar/Shutdown control input | Floating = bipolar mode; VDDA = unipolar mode; 0V = 10µA shutdown-no external pull-up/down needed. |
| 2 (CLK) | Conversion clock input | Drives SAR logic and internal DAC switching; 125Hz–1.7MHz range; duty cycle 25–75% required. |
| 3 (SCLK) | Serial clock input | Controls post-conversion data readout up to 5MHz; asynchronous to CLK-enables independent host timing. |
| 4 (VDDD) | +5V digital supply | Power for digital interface and control logic; decoupled separately from analog rails to prevent noise coupling. |
| 5 (DOUT) | Three-state serial data output | MSB-first 14-bit + 2 sub-LSBs; high-impedance when CS = high-allows bus sharing with other peripherals. |
| 6 (DGND) | Digital ground reference | Isolated return path for VDDD/VSSD; must be connected to AGND at single point to minimize ground loops. |
| 7 (EOC) | End-of-conversion output | Active-high pulse signals completion; can interrupt processor or feed back to CONV for continuous conversions. |
| 8 (CS) | Chip-select input (active low) | Enables DOUT driver and serial interface; required for any data read-no read possible without CS assertion. |
| 9 (CONV) | Convert-start input (active low) | Initiates conversion on falling edge synchronized to CLK; ignored during ongoing conversion or calibration. |
| 10 (RESET) | Reset input (active low) | Halts operation; rising edge triggers full calibration (8.2ms at 1.7MHz CLK)-required after major supply/temperature shifts. |
| 11 (VSSD) | –5V digital supply | Negative rail for digital logic; must match VSSA within ±0.3V to avoid latch-up or parametric shift. |
| 12 (REF) | Reference voltage input (0V to +5V) | Defines full-scale range; drives >1000pF dynamic load at CLK frequency-requires low-ESR bypass (1µF + 0.1µF). |
| 13 (AIN) | Analog input (unipolar 0V–VREF or bipolar –VREF–+VREF) | Capacitive input (250pF); sampled continuously-requires low-impedance source or external buffer for <1LSB settling. |
| 14 (AGND) | Analog ground reference | Return for VDDA/VSSA and AIN/REF; star-connected to DGND at single point to preserve PSRR (>65dB). |
| 15 (VSSA) | –5V analog supply | Negative rail for analog front-end; matched to VSSD to maintain common-mode integrity in differential sampling. |
| 16 (VDDA) | +5V analog supply | Power for internal DAC, comparator, and calibration circuitry; independent of VDDD to suppress digital switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-calibration engine | Stores digital correction codes for each MSB capacitor-maintains ±1⁄2 LSB INL over 0°C to +70°C without external trim. |
| Inherent track/hold | Capacitive-DAC architecture eliminates need for external THS-reduces BOM count and layout area in space-constrained designs. |
| Separate analog/digital supplies | VDDA/VSSA and VDDD/VSSD isolation achieves >65dB PSRR-enables clean ADC operation in mixed-signal PCBs with noisy digital domains. |
| Three-level BP/UP/SHDN pin | Single-pin configuration of input range and shutdown-simplifies firmware control and reduces GPIO usage in microcontroller interfaces. |
| Pin-compatible upgrade path | Direct replacement for MAX195 (16-bit) in same footprint-allows resolution scaling without PCB redesign or layout revalidation. |
Applications
| Portable Instrumentation | Medical Signal Acquisition |
|---|---|
Use Scenario: Battery-powered handheld multimeters and oscilloscopes requiring high DC accuracy and low standby power. IC Role / Device Role / Timing Role: Primary data converter capturing sensor outputs with 14-bit fidelity and <10µA quiescent draw between measurements. Use Value: 10µA shutdown extends battery life >10× vs. non-shutdown ADCs; ±1⁄2 LSB INL ensures traceable calibration without field recalibration. |
Use Scenario: ECG and EEG front-ends where signal integrity, low noise, and bipolar input range are mandatory. IC Role / Device Role / Timing Role: Analog front-end digitizer accepting ±5V differential inputs from instrumentation amplifiers with 82dB SINAD. Use Value: Built-in track/hold and 250pF input capacitance enable direct connection to low-noise IA outputs-no external THS needed. |
| Industrial Process Monitoring | Vibration Analysis Systems |
Use Scenario: PLC analog input modules measuring temperature, pressure, and flow transducers in factory environments. IC Role / Device Role / Timing Role: High-reliability ADC operating across 0°C to +70°C with auto-calibration to compensate for thermal drift in unattended systems. Use Value: On-chip calibration eliminates need for periodic manual recalibration-reducing maintenance cost and downtime in remote installations. |
Use Scenario: Predictive maintenance units capturing high-frequency mechanical vibration waveforms from accelerometers. IC Role / Device Role / Timing Role: 85ksps sampling ADC capturing 0–40kHz spectral content with 14-bit resolution for FFT-based fault detection. Use Value: 9.4µs conversion time enables tight sampling intervals; 82dB SINAD preserves SNR for accurate amplitude/frequency analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8320IDR | 16-bit resolution, 100ksps, SPI-only interface, no internal track/hold, requires external REF buffer. | Higher resolution but lacks bipolar input flexibility and auto-calibration-suited for DC-critical, low-noise lab equipment. | Select if 16-bit ENOB and SPI-native interface outweigh need for onboard calibration and bipolar support. |
| AD7892BRZ-1 | 12-bit resolution, 600ksps, CMOS process, single +5V supply, no shutdown mode. | Faster sampling but lower resolution and no power-down-optimized for high-speed industrial control loops, not precision measurement. | Choose when throughput >600ksps is mandatory and 12-bit accuracy suffices for closed-loop feedback control. |
Compared with ADS8320IDR and AD7892BRZ-1, the MAX194ACWE+ uniquely combines 14-bit precision, auto-calibration, bipolar/unipolar configurability, and 10µA shutdown in a single 16-pin SO package-making it optimal for portable, battery-sensitive, and thermally variable measurement systems where calibration stability is non-negotiable.
Availability
MAX194ACWE+ is available at Aetrix Electronics and suitable for portable instrumentation, medical signal acquisition, industrial process monitoring, and vibration analysis systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX194ACWE+ 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 MAX194ACWE+ belongs to Maxim's precision data-converter product line, designed specifically for high-accuracy, low-power, and thermally robust measurement systems where auto-calibration and flexible input configuration are essential.
FAQ
What is the operating temperature range for the MAX194ACWE+?
The MAX194ACWE+ is rated for 0°C to +70°C ambient operation. This grade ('C' suffix) is validated across the full range for all key parameters including ±1⁄2 LSB INL, 82dB SINAD, and 10µA shutdown current. Operation outside this range requires validation against the 'E' (–40°C to +85°C) or 'M' (–55°C to +125°C) variants-MAX194ACWE+ itself is not characterized beyond +70°C.
Does the MAX194ACWE+ require an external reference voltage?
Yes, the MAX194ACWE+ requires an external reference voltage applied to the REF pin (0V to +5V). It does not include an internal reference. For full 14-bit accuracy, the reference must exhibit <61ppm total error over temperature-e.g., MAX6241 (1ppm/°C drift) or buffered MAX874. The REF pin presents a dynamic >1000pF load at CLK frequency, mandating low-ESR bypassing (1µF + 0.1µF).
How does the MAX194ACWE+ achieve ±1⁄2 LSB INL without external calibration?
The MAX194ACWE+ achieves ±1⁄2 LSB INL through on-chip calibration DACs that digitally correct errors in each MSB capacitor. Calibration occurs automatically on power-up or via RESET pulse, storing correction codes in nonvolatile logic. These codes are reapplied during conversion-no external components, trims, or software compensation are needed to maintain spec across 0°C to +70°C.
Can the MAX194ACWE+ operate with a single +5V supply?
No, the MAX194ACWE+ requires dual ±5V analog supplies (VDDA = +5V, VSSA = –5V) and dual ±5V digital supplies (VDDD = +5V, VSSD = –5V). The absolute maximum ratings specify VSSA/VSSD down to –6V, and operation with only +5V violates the specified supply topology. Using single-supply configurations will cause functional failure or permanent damage.
What is the purpose of the BP/UP/SHDN pin on the MAX194ACWE+?
The BP/UP/SHDN pin on the MAX194ACWE+ is a three-state logic input that configures core functionality: floating = bipolar input range (–VREF to +VREF), VDDA = unipolar range (0V to VREF), and 0V = 10µA shutdown mode. It eliminates need for discrete logic or firmware-controlled GPIOs to switch between measurement modes or reduce power-simplifying both hardware and software design.
MAX194ACWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 85k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- ±5V
- Voltage - Supply, Digital:
- ±5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX194ACWE+ FAQ
1.How can I place an order for MAX194ACWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX194ACWE+ 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 MAX194ACWE+ reliable?
The price and inventory of MAX194ACWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX194ACWE+ is usually 5 days.
3.What payment methods are accepted for MAX194ACWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX194ACWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX194ACWE+?
MAX194ACWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX194ACWE+ 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 MAX194ACWE+?
For technical support, including MAX194ACWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX194ACWE+ requirements.
6.How does Aetrix verify that MAX194ACWE+ is sourced from the original manufacturer or authorized distributors?
All MAX194ACWE+ 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 MAX194ACWE+ meets industry standards.
7.What is the process for return or replacement of MAX194ACWE+?
All MAX194ACWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX194ACWE+, 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 MAX194ACWE+ part is unused and in its original packaging.
Return procedure for MAX194ACWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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