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Analog Devices Inc./Maxim Integrated MAX194BCWE+
- Part No.:
- MAX194BCWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX194BCWE+.pdf
- Description:
- IC ADC 14BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:417
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Product details
Overview
MAX194BCWE+ from Maxim Integrated is a 14-bit successive-approximation analog-to-digital converter (ADC) with 85ksps sampling rate, ±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 systems.
For engineers reviewing the MAX194BCWE+ datasheet, MAX194BCWE+ pinout, MAX194BCWE+ application, or MAX194BCWE+ equivalent, this page delivers verified electrical specs, validated package mapping, confirmed timing behavior at 1.7MHz CLK, real-world interface constraints for SCLK up to 5Mbps, and precise calibration requirements including 8.2ms power-up calibration time.
Technical Context
The MAX194BCWE+ implements a capacitive-DAC SAR architecture with integrated calibration DACs per MSB capacitor, enabling automatic correction of linearity and offset errors across 0°C to +70°C without external trimming. Its internal track/hold function is inherent to the capacitor array switching sequence, requiring no external components.
Conversion is initiated by CONV falling edge synchronized to CLK, with EOC signaling completion; data output supports two modes-real-time bit streaming during conversion (at CLK rate) or post-conversion serial readout (at SCLK up to 5MHz). The BP/UP/SHDN pin configures input range or enables 10µA shutdown via three-level logic (floating = bipolar, +5V = unipolar, 0V = shutdown).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete digital codes for high-fidelity signal digitization |
| Sampling Rate | 85ksps - supports Nyquist-limited bandwidth up to ~42.5kHz for anti-aliasing design |
| INL | ±1/2 LSB - ensures monotonicity and ≤0.006% full-scale linearity error over temperature |
| SINAD | 82dB - corresponds to effective resolution of ~13.3 bits at 1kHz input under bipolar conditions |
| Conversion Time | 9.4µs - defines minimum inter-conversion interval and maximum throughput in continuous mode |
| Shutdown Current | 10µA - enables ultra-low-power sleep state with fast 90µs wake-up (tSU) for battery-powered systems |
| Reference Range | 0V to +5V - supports ratiometric measurement using VDDA as reference when bypassed properly |
| Supply Voltages | VDDA/VDDD = +4.75V to +5.25V; VSSA/VSSD = –5.25V to –4.75V - requires dual ±5V rails for full-spec operation |
Pinout & Package
MAX194BCWE+ is housed in a 16-pin wide SO (Small Outline) package with 1.27mm pitch, JEDEC MS-012AC compliant, and rated for 0°C to +70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BP/UP/SHDN) | Bipolar/Unipolar/Shutdown control | Three-state input: floating = ±VREF input range; +5V = 0V to VREF; 0V = 10µA shutdown mode |
| 2 (CLK) | Conversion clock input | Drives internal SAR logic; 1.7MHz max frequency, 25–75% duty cycle required for full accuracy |
| 3 (SCLK) | Serial clock input | Controls post-conversion data readout; supports up to 5MHz asynchronous to CLK |
| 4 (VDDD) | +5V digital supply | Power for digital interface and control logic; must be decoupled with 0.1µF ceramic near pin |
| 5 (DOUT) | Serial data output | Three-state MSB-first output (14 data + 2 sub-LSBs); enabled only when CS = low |
| 6 (DGND) | Digital ground | Return path for VDDD/VSSD; must be isolated from AGND except at single-point star ground |
| 7 (EOC) | End-of-conversion output | Active-high pulse marks conversion/calibration start and end; usable as interrupt or auto-trigger for CONV |
| 8 (CS) | Chip select input | Active-low enable for DOUT; controls serial interface activation and output impedance state |
| 9 (CONV) | Convert-start input | Falling-edge triggered; must be synchronized to CLK falling edge per timing windows in Figures 3–4 |
| 10 (RESET) | Reset input | Low-hold halts operation; rising edge initiates full calibration (8.2ms at 1.7MHz CLK) |
| 11 (VSSD) | –5V digital supply | Negative rail for digital circuitry; requires symmetric decoupling to VDDD |
| 12 (REF) | Reference voltage input | 0V to +5V range; presents >1000pF dynamic load; requires low-impedance source and 1µF + 0.1µF bypass |
| 13 (AIN) | Analog input | Single-ended input with ±VREF (bipolar) or 0V to VREF (unipolar) range; 250pF input capacitance |
| 14 (AGND) | Analog ground | Return for VDDA/VSSA and AIN/REF; must be physically separated from DGND to minimize noise coupling |
| 15 (VSSA) | –5V analog supply | Negative rail for analog front-end; matched to VDDA in voltage and decoupling for PSRR optimization |
| 16 (VDDA) | +5V analog supply | Power for SAR, DAC, comparator, and calibration circuitry; critical for DC accuracy and noise floor |
Key Features
| Feature | Design Value |
|---|---|
| True 14-bit accuracy | Guaranteed ±1/2 LSB INL and ±1 LSB DNL over 0°C to +70°C - eliminates need for system-level linearization |
| Integrated track/hold | Inherent to capacitive-DAC architecture - removes external THS requirement and associated board space/cost |
| Auto-calibration | Performs full offset/linearity correction on power-up or RESET; stores digital trim codes - no drift accumulation over time |
| Flexible input configuration | Single-pin (BP/UP/SHDN) selection of bipolar/unipolar/shutdown - simplifies PCB routing and firmware logic |
| High-speed serial interface | Supports 5Mbps SCLK for post-conversion reads and real-time CLK-synchronized bit streaming - enables µP or FPGA integration with minimal GPIO |
| Dual-supply isolation | Separate VDDA/VSSA and VDDD/VSSD rails with independent AGND/DGND - achieves >65dB PSRR against digital noise coupling |
Applications
| Portable Instrumentation | Medical Signal Acquisition |
|---|---|
|
Use Scenario: Handheld multimeters and battery-powered oscilloscopes requiring precision DC accuracy and low standby power. IC Role / Device Role / Timing Role: Primary ADC digitizing sensor outputs and front-panel analog signals with calibrated 14-bit resolution. Use Value: 10µA shutdown current extends battery life; auto-calibration maintains accuracy across temperature swings during field use. |
Use Scenario: ECG and EEG front-ends capturing low-amplitude bio-signals with high SNR and minimal distortion. IC Role / Device Role / Timing Role: High-fidelity analog-to-digital conversion of differential biopotential inputs referenced to patient ground. Use Value: 82dB SINAD and ±1/2 LSB INL preserve diagnostic waveform integrity; bipolar input supports AC-coupled electrode interfaces. |
| Industrial Process Monitoring | Vibration Analysis Systems |
|
Use Scenario: PLC analog input modules measuring 4–20mA loop signals and thermocouple outputs in factory environments. IC Role / Device Role / Timing Role: Isolated ADC channel converting conditioned industrial sensor voltages with robust noise immunity. Use Value: Dual-supply separation and >65dB PSRR reject switching noise from nearby motor drives and power supplies. |
Use Scenario: Predictive maintenance units sampling accelerometer outputs at kHz rates to detect bearing faults and imbalance. IC Role / Device Role / Timing Role: Medium-speed data acquisition engine capturing time-domain vibration waveforms for FFT analysis. Use Value: 85ksps sustained sampling supports 40kHz Nyquist bandwidth; 9.4µs conversion time enables tight timing control in multi-channel sync. |
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 auto-calibration and bipolar input flexibility; needs additional support circuitry | Select when absolute 16-bit DC accuracy is prioritized over system integration simplicity and power efficiency |
| AD7892BRZ-1 | 12-bit resolution, 600ksps, CMOS process, single +5V supply, no bipolar input mode | Higher speed but lower resolution and no built-in calibration; unipolar-only input limits transducer compatibility | Select for cost-sensitive, high-throughput unipolar applications where 12-bit accuracy suffices and layout space is constrained |
Compared with ADS8320IDR and AD7892BRZ-1, the MAX194BCWE+ uniquely combines 14-bit accuracy with auto-calibration, bipolar/unipolar configurability, and integrated track/hold in a dual-supply SO package-reducing BOM count and improving long-term stability in embedded measurement systems.
Availability
MAX194BCWE+ 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 production lifecycles.
Supply support for MAX194BCWE+ 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 demanding industrial, medical, and communications applications.
The MAX194 series was developed specifically for high-accuracy, low-power data acquisition in portable and embedded systems-emphasizing self-calibrating SAR architecture, flexible input configuration, and robust dual-supply operation.
FAQ
What is the operating temperature range for the MAX194BCWE+?
The MAX194BCWE+ is specified for 0°C to +70°C ambient operation. This grade is confirmed in the Ordering Information table, where "MAX194BCWE" is explicitly listed with "0°C to +70°C" and "16 Wide SO" packaging. It does not support industrial (–40°C to +85°C) or military (–55°C to +125°C) temperature ranges-those require suffixes AEWE, BEWE, AMDE, or BMDE.
Does the MAX194BCWE+ require an external reference voltage?
Yes, the MAX194BCWE+ requires an external reference voltage applied to the REF pin. It accepts 0V to +5V, and performance depends critically on REF source impedance and bypassing: a low-ESR 1µF + 0.1µF capacitor pair is mandatory, and reference drift >0.1ppm/°C degrades full-scale accuracy. The device does not include an internal reference.
How does the BP/UP/SHDN pin configure input range and shutdown on the MAX194BCWE+?
On the MAX194BCWE+, BP/UP/SHDN is a three-level control: left floating → bipolar input (–VREF to +VREF); tied to +5V → unipolar input (0V to VREF); driven to 0V → 10µA shutdown mode. This single pin eliminates external logic or jumpers, and its leakage is specified at ±100nA-ensuring stable state retention without pull-up/down resistors.
What is the minimum and maximum clock frequency for reliable operation of the MAX194BCWE+?
The MAX194BCWE+ supports CLK frequencies from 125Hz (for TA ≤ +70°C) up to 1.7MHz maximum. Below 1.7MHz, duty cycle must stay between 25% and 75%, and high/low times must exceed 150ns. Holding CLK high >50ms risks internal state loss, requiring RESET pulse to reinitiate calibration before accurate conversion resumes.
Can the MAX194BCWE+ perform continuous conversions without processor intervention?
Yes, the MAX194BCWE+ supports continuous conversions by connecting the EOC output directly to the CONV input. After power-up calibration completes, EOC's falling edge triggers the next conversion automatically-enabling full 85ksps throughput with zero µP overhead. This configuration is validated in Figure 8 of the datasheet and requires no software polling or timing loops.
MAX194BCWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- -
MAX194BCWE+ FAQ
1.How can I place an order for MAX194BCWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX194BCWE+ 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 MAX194BCWE+ reliable?
The price and inventory of MAX194BCWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX194BCWE+ is usually 5 days.
3.What payment methods are accepted for MAX194BCWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX194BCWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX194BCWE+?
MAX194BCWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX194BCWE+ 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 MAX194BCWE+?
For technical support, including MAX194BCWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX194BCWE+ requirements.
6.How does Aetrix verify that MAX194BCWE+ is sourced from the original manufacturer or authorized distributors?
All MAX194BCWE+ 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 MAX194BCWE+ meets industry standards.
7.What is the process for return or replacement of MAX194BCWE+?
All MAX194BCWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX194BCWE+, 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 MAX194BCWE+ part is unused and in its original packaging.
Return procedure for MAX194BCWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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