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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:1,876
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Product details
Overview
The 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, package mapping to 16-pin wide SO, functional pin roles, real-world use cases, and two validated alternative ADCs for precision data acquisition designs requiring stable DC accuracy and low-power operation.
Technical Context
The MAX194BCWE implements a capacitive-DAC SAR architecture with integrated calibration DACs per MSB capacitor, enabling automatic on-chip correction of linearity and offset errors across 0°C to +70°C. Its internal track/hold function is inherent to the capacitor array switching sequence, eliminating external sample-and-hold circuitry.
It supports dual serial readout modes: synchronous bit-by-bit output during conversion at CLK (up to 1.7MHz), or asynchronous post-conversion streaming at SCLK (up to 5MHz). The BP/UP/SHDN pin provides three-state logic control for input range selection (floating = bipolar, high = unipolar, low = shutdown), directly configuring analog front-end behavior without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete digital codes for high-fidelity signal digitization in medical and industrial sensing. |
| Sampling Rate | 85ksps - enables real-time capture of audio-band and vibration signals up to ~40kHz Nyquist frequency. |
| INL | ±1/2 LSB - ensures monotonicity and <0.006% full-scale linearity error, critical for closed-loop control feedback. |
| SINAD | 82dB - corresponds to ~13.6 effective number of bits (ENOB), supporting high-dynamic-range measurements. |
| Conversion Time | 9.4µs - defines minimum inter-conversion interval; allows >100ksps sustained throughput when overlapping acquisition. |
| Shutdown Current | 10µA - reduces system power by >99% vs active mode (IDDA + IDDD ≈ 8.8mA), ideal for battery-powered instruments. |
| Input Range | Pin-selectable unipolar (0V to VREF) or bipolar (–VREF to +VREF) - simplifies sensor interface without external level-shifting. |
| Reference Range | 0V to +5V - accepts standard precision references (e.g., MAX6241) or ratiometric supply-derived references. |
Pinout & Package
MAX194BCWE is housed in a 16-pin wide SO (Small Outline) package, RoHS-compliant, with 1.27mm pitch and exposed pad not present. Thermal resistance θJA = 105°C/W; max power dissipation at +70°C = 762mW.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BP/UP/SHDN) | Bipolar/Unipolar/Shutdown control input | Floating = bipolar input range; VDDA = unipolar; 0V = 10µA shutdown - configures analog interface and power state in one pin. |
| 2 (CLK) | Conversion clock input | Drives SAR logic and internal DAC switching; 1.7MHz max frequency defines conversion timing and acquisition window. |
| 3 (SCLK) | Serial clock input | Controls asynchronous data readout at up to 5MHz; decouples digital interface timing from conversion clock domain. |
| 4 (VDDD) | +5V digital supply | Isolates digital switching noise from analog section; must be bypassed with 0.1µF ceramic near pin. |
| 5 (DOUT) | Serial data output (MSB first) | Three-state output enabled by CS; delivers 14 data bits + 2 sub-LSBs; compatible with SPI/QSPI framing. |
| 6 (DGND) | Digital ground | Return path for VDDD and digital I/O; must be separated from AGND except at single-point star ground. |
| 7 (EOC) | End-of-conversion output | Active-high pulse signals conversion completion; can interrupt µP or auto-trigger next CONV for continuous mode. |
| 8 (CS) | Chip select (active low) | Enables DOUT three-state driver and serial interface; required for all data reads. |
| 9 (CONV) | Convert-start input (active low) | Initiates conversion on falling edge synchronized to CLK; supports both single-shot and continuous acquisition. |
| 10 (RESET) | Reset input | Rising edge triggers full internal calibration (8.2ms); halts operation when held low - essential after supply transients. |
| 11 (VSSD) | –5V digital supply | Negative rail for digital logic; requires local 0.1µF ceramic bypass; must match VSSA voltage within ±0.3V. |
| 12 (REF) | Reference voltage input | Defines full-scale range; drives >1000pF dynamic load at CLK rate; requires low-impedance source (e.g., op-amp buffered). |
| 13 (AIN) | Analog input | Accepts 0V to VREF (unipolar) or –VREF to +VREF (bipolar); input capacitance = 250pF; requires external RC anti-aliasing. |
| 14 (AGND) | Analog ground | Return for VDDA/VSSA, REF, and AIN; must be isolated from DGND except at system-level star point. |
| 15 (VSSA) | –5V analog supply | Negative analog rail; powers internal comparator and DAC array; sensitive to noise coupling - bypass with 10µF + 0.1µF. |
| 16 (VDDA) | +5V analog supply | Positive analog rail; powers reference buffer and analog front-end; must be clean and well-regulated. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip calibration | Corrects INL and offset errors across 0°C to +70°C without external trims - maintains ±1/2 LSB performance over temperature. |
| Capacitive-DAC track/hold | Eliminates need for external sample-and-hold IC; acquisition time fixed at 2.4µs (4 CLK cycles at 1.7MHz). |
| Separate analog/digital supplies | VDDA/VSSA and VDDD/VSSD isolation reduces digital switching noise coupling into analog path - improves AC performance. |
| Three-level BP/UP/SHDN pin | Single-pin configuration of input range polarity and power state - reduces PCB routing and firmware complexity. |
| Pin-compatible upgrade path | Functional and pinout compatibility with 16-bit MAX195 - enables resolution scaling without layout change. |
| Two serial readout modes | Read during conversion (CLK-synchronized) for max throughput, or between conversions (SCLK-synchronized) for flexible µP interfacing. |
Applications
| Portable Instrumentation | Medical Signal Acquisition |
|---|---|
|
Use Scenario: Handheld multimeters and portable oscilloscopes requiring high-resolution DC accuracy and low standby power. IC Role / Device Role / Timing Role: Primary ADC digitizing sensor outputs and front-panel controls; operates in shutdown between measurements. Use Value: 10µA shutdown current extends battery life; ±1/2 LSB INL ensures calibrated measurement repeatability across operating temperature. |
Use Scenario: ECG and EEG front-ends capturing low-amplitude bio-signals with minimal distortion. IC Role / Device Role / Timing Role: High-SINAD digitizer for analog front-end amplifiers; uses bipolar input range to handle bidirectional physiological voltages. Use Value: 82dB SINAD preserves signal fidelity; separate AGND/DGND prevents digital noise from corrupting microvolt-level inputs. |
| Industrial Process Monitoring | Vibration Analysis Systems |
|
Use Scenario: PLC analog input modules measuring 4–20mA transducer outputs in factory automation. IC Role / Device Role / Timing Role: Precision ADC interfaced to instrumentation amplifiers; performs periodic scans of multiple channels via external MUX. Use Value: Unipolar/bipolar pin-selectability simplifies support for diverse sensor types; built-in calibration avoids field recalibration. |
Use Scenario: Predictive maintenance units analyzing bearing vibration spectra using FFT-based analysis. IC Role / Device Role / Timing Role: High-speed data capture engine feeding DSP processors; operates continuously at 85ksps with EOC-triggered reads. Use Value: 9.4µs conversion time enables oversampling for noise reduction; 14-bit resolution resolves harmonic content up to 13th order. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-accuracy, medium-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8320UB | 16-bit, 100ksps, SPI-only interface, no internal track/hold, requires external REF buffer | Higher resolution but lacks bipolar input and integrated calibration - demands more external components and system-level trimming | Select when 16-bit ENOB is mandatory and board space allows external support circuitry. |
| AD7892BRZ | 12-bit, 600ksps, parallel/serial interface, 3µA shutdown, no auto-calibration | Higher speed and lower power, but 2-bit lower resolution and no on-chip linearity correction - requires external calibration for DC accuracy | Select for cost-sensitive, high-throughput applications where ±1 LSB INL is acceptable and firmware handles offset correction. |
Compared with ADS8320UB and AD7892BRZ, the MAX194BCWE uniquely combines 14-bit accuracy with self-calibration, bipolar/unipolar flexibility, and integrated track/hold - reducing BOM count and validation effort in portable and medical designs where DC precision and low standby power are co-priorities.
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 MAX194BCWE belongs to Maxim's high-accuracy data acquisition product line, engineered for applications requiring guaranteed DC specifications, low-power operation, and minimal external component count in space-constrained environments.
FAQ
What is the operating temperature range for the MAX194BCWE?
The MAX194BCWE is specified for 0°C to +70°C ambient operation. This commercial-grade temperature range is confirmed in the Ordering Information table, where MAX194BCWE is explicitly listed with "0°C to +70°C" under TEMP. RANGE. All electrical characteristics-including INL, SINAD, and conversion time-are guaranteed across this full range after internal calibration.
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 (up to VDDA), and performance depends critically on reference stability and drive capability. The datasheet specifies that REF must source >300µA peak current and be bypassed with low-ESR capacitors (e.g., 47µF + 0.1µF) to maintain 14-bit accuracy - no internal reference is provided.
How does the BP/UP/SHDN pin configure the MAX194BCWE?
The BP/UP/SHDN pin on the MAX194BCWE provides three distinct functions via voltage level: floating (high-impedance) selects bipolar input range (–VREF to +VREF); VDDA (≈+5V) selects unipolar range (0V to VREF); and 0V places the device in 10µA shutdown mode. This single-pin configurability eliminates external logic for range/power control in compact designs.
What is the maximum serial clock (SCLK) frequency supported by the MAX194BCWE?
The MAX194BCWE supports a maximum SCLK frequency of 5MHz, as stated in the ELECTRICAL CHARACTERISTICS table under "fSCLK Serial Clock Frequency." This enables post-conversion data readout at up to 5Mbps, allowing efficient transfer of the 16-bit output (14 data + 2 sub-LSBs) in ≤3.2µs - critical for high-throughput µP interfacing.
Is the MAX194BCWE pin-compatible with other devices in the MAX194 family?
Yes, the MAX194BCWE shares identical pinout and footprint with all MAX194 variants (e.g., MAX194ACWE, MAX194AEPE) in the same package type. The "16 Wide SO" package designation applies uniformly across MAX194x C- and A-grade versions, ensuring drop-in replacement for temperature or grade upgrades without PCB modification.
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:
- Obsolete
- 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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