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Analog Devices Inc./Maxim Integrated MAX195BCWE+
- Part No.:
- MAX195BCWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX195BCWE+.pdf
- Description:
- IC ADC 16BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:473
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Product details
Overview
MAX195BCWE+ from Maxim Integrated is a 16-bit successive-approximation ADC with 85ksps throughput, 9.4µs conversion time, 90dB 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 MAX195BCWE+ datasheet, MAX195BCWE+ pinout, MAX195BCWE+ application, or MAX195BCWE+ equivalent, key selection considerations include its SAR architecture, ±0.004%FSR unipolar offset error, −90dB THD at 1kHz, 5MHz serial clock support, and compatibility with external references up to +5V.
Technical Context
The MAX195BCWE+ implements a capacitive-DAC SAR architecture with an integrated 16-capacitor array (including dummy LSB), enabling inherent track/hold functionality and eliminating external sample-and-hold requirements. Calibration DACs per MSB capacitor correct linearity and offset errors across temperature without external trimming.
Its digital interface supports two serial read modes: synchronous bit-by-bit output during conversion (at CLK rate) or asynchronous post-conversion readout (at SCLK up to 5MHz). The BP/UP/SHDN pin provides three-state logic control for bipolar/unipolar mode selection or 10µA shutdown-no external pull-ups required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits - guarantees no missing codes over full operating range |
| Conversion Rate | 85ksps - maximum sustained sampling rate under specified conditions |
| Conversion Time | 9.4µs - fixed latency from CONV assertion to EOC assertion |
| SINAD | 90dB - signal-to-noise-plus-distortion ratio at 1kHz input, defining dynamic fidelity |
| Input Range | Selectable unipolar (0V to VREF) or bipolar (−VREF to +VREF) - configured via BP/UP/SHDN pin state |
| Shutdown Current | 10µA max - ultra-low power state preserving calibration data and enabling rapid wake-up |
| Supply Voltages | VDDA/VDDD = +4.75V to +5.25V; VSSA/VSSD = −5.25V to −4.75V - dual-supply operation with strict rail symmetry |
Pinout & Package
MAX195BCWE+ is housed in a 16-pin wide SO (Small Outline) package with 1.27mm pitch, JEDEC MS-013AC compliant, and rated for 0°C to +70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BP/UP/SHDN) | Mode control input | Floating = bipolar input range; VDDD = unipolar; 0V = 10µA shutdown |
| 2 (CLK) | Conversion clock input | Drives internal SAR timing; 1.7MHz max, 25–75% duty cycle required |
| 3 (SCLK) | Serial clock input | Controls asynchronous data readout; up to 5MHz, independent of CLK |
| 4 (VDDD) | +5V digital supply | Power for digital logic and serial interface; decoupling critical for noise immunity |
| 5 (DOUT) | Serial data output | Three-state MSB-first output enabled by CS low; compatible with SPI/QSPI framing |
| 6 (DGND) | Digital ground reference | Isolated return path for digital circuitry; must be separated from AGND |
| 7 (EOC) | End-of-conversion indicator | Active-high pulse signals completion; usable as interrupt or auto-trigger for continuous mode |
| 8 (CS) | Chip select input | Active-low enables DOUT three-state driver and serial interface access |
| 9 (CONV) | Convert-start input | Falling-edge triggered; initiates acquisition and conversion sequence |
| 10 (RESET) | Calibration reset input | Rising edge triggers full internal calibration; halts operation when held low |
| 11 (VSSD) | −5V digital supply | Negative rail for digital logic; requires symmetric decoupling with VDDD |
| 12 (REF) | Reference voltage input | 0V to +5V range; drives DAC array continuously; low-impedance source required |
| 13 (AIN) | Analog input | Capacitive input (250pF unipolar); accepts ±VREF or 0V–VREF based on BP/UP/SHDN |
| 14 (AGND) | Analog ground reference | Return for analog circuitry; must be star-connected and isolated from DGND |
| 15 (VSSA) | −5V analog supply | Negative rail for analog front-end; matched to VSSD for common-mode rejection |
| 16 (VDDA) | +5V analog supply | Power for comparator, DAC, and analog logic; decoupling essential for AC performance |
Key Features
| Feature | Design Value |
|---|---|
| Built-in track/hold function | Capacitive-DAC architecture eliminates need for external sample-and-hold IC or circuit |
| Internal calibration | Digitally stored per-capacitor correction data maintains ±3LSB INL over 0°C to +70°C |
| Pin-selectable input range | Single-pin configuration (BP/UP/SHDN) enables system-level flexibility without firmware change |
| Three-state serial output | DOUT high-impedance when CS high allows direct connection to shared microcontroller SPI bus |
| Low-power shutdown | 10µA max quiescent current preserves battery life in portable instruments between measurements |
Applications
| Portable Instruments | Medical Signal Acquisition |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscopes requiring high-resolution DC and AC measurements with battery-powered operation. IC Role / Device Role / Timing Role: Primary analog-to-digital converter capturing sensor or probe signals at up to 85ksps with calibrated 16-bit accuracy. Use Value: 90dB SINAD and ±0.004%FSR offset error enable sub-millivolt resolution in field-deployed test equipment. |
Use Scenario: ECG and EEG front-ends where low-noise, high-linearity digitization of microvolt-level bio-signals is critical. IC Role / Device Role / Timing Role: High-fidelity ADC interfacing with instrumentation amplifiers to digitize differential physiological waveforms. Use Value: Bipolar ±VREF input range and built-in track/hold support ratiometric measurement against stable reference without external components. |
| Industrial Controls | Vibrations Analysis |
Use Scenario: PLC analog input modules monitoring process variables (temperature, pressure, flow) in factory automation systems. IC Role / Device Role / Timing Role: Precision ADC converting conditioned transducer outputs into digital values for real-time control loop execution. Use Value: Separate analog/digital supplies and ±0.0075%FSR unipolar full-scale error ensure robustness against industrial electrical noise and long-term stability. |
Use Scenario: Predictive maintenance systems acquiring high-frequency vibration spectra from accelerometers on rotating machinery. IC Role / Device Role / Timing Role: High-speed data acquisition node capturing transient mechanical events at Nyquist-compliant rates. Use Value: 85ksps sustained throughput and −97dB peak spurious noise support accurate FFT-based spectral analysis up to 40kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8505IPW | 5V single-supply operation; no negative rails required; 250ksps max; internal reference option | Eliminates dual-supply design complexity but lacks bipolar input flexibility | Preferred when system already uses 5V-only rails and unipolar sensing dominates |
| AD7606BSTZ | 8-channel simultaneous-sampling; ±10V/±5V input; 200ksps; integrated reference and antialiasing filter | Targets multi-sensor synchronized acquisition rather than single-channel high-fidelity use | Chosen for motor control or power quality analyzers needing phase-coherent channel sets |
Compared with ADS8505IPW and AD7606BSTZ, the MAX195BCWE+ delivers superior DC accuracy (±0.004%FSR offset) and lower power shutdown (10µA vs. >100µA), making it optimal for battery-operated precision instruments where dual-supply infrastructure is acceptable.
Availability
MAX195BCWE+ is available at Aetrix Electronics and suitable for portable instruments, medical signal acquisition, and industrial controls requiring stable component supply across extended production lifecycles.
Supply support for MAX195BCWE+ 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 MAX195BCWE+ belongs to Maxim's high-accuracy data acquisition product line, engineered specifically for applications requiring calibrated 16-bit resolution, low power, and robust noise immunity in portable and embedded systems.
FAQ
What is the operating temperature range for the MAX195BCWE+?
The MAX195BCWE+ is specified for 0°C to +70°C ambient operation. This commercial-grade temperature range aligns with its BC grade designation and is validated across all electrical parameters including INL (±3LSB), offset error (±0.004%FSR), and conversion time (9.4µs). Operation outside this range requires consultation of the MAX195BEWE or MAX195AEDE variants.
How does the MAX195BCWE+ achieve its 16-bit no-missing-codes performance?
The MAX195BCWE+ achieves guaranteed no-missing-codes performance through a combination of capacitor-array trimming during production and digitally stored per-capacitor calibration data. Its 16-bit SAR architecture with dummy LSB and ten calibration DACs corrects monotonicity errors across temperature, ensuring all 65,536 codes appear within the specified ±3LSB INL limit over 0°C to +70°C.
Can the MAX195BCWE+ operate with a single +5V supply?
No, the MAX195BCWE+ requires dual analog and digital supplies: VDDA/VDDD = +4.75V to +5.25V and VSSA/VSSD = −5.25V to −4.75V. Its internal comparator and capacitive DAC depend on symmetric ±5V rails to support the full ±VREF bipolar input range and maintain specified THD (−90dB) and SINAD (90dB). Single-supply operation is not supported.
What is the purpose of the BP/UP/SHDN pin on the MAX195BCWE+?
The BP/UP/SHDN pin on the MAX195BCWE+ serves three distinct functions: floating configures bipolar input range (−VREF to +VREF); driven to VDDD selects unipolar range (0V to VREF); pulled to 0V activates 10µA shutdown mode. This single-pin tri-state control eliminates external logic or firmware configuration overhead while preserving calibration data during low-power states.
Does the MAX195BCWE+ require an external reference voltage?
Yes, the MAX195BCWE+ requires an external reference voltage applied to the REF pin, ranging from 0V to +5V. It does not include an internal reference. For optimal performance, the reference must drive >1000pF dynamic load at conversion clock frequency and present <1Ω impedance at REF-typically achieved using a buffered low-ESR capacitor network (e.g., 47µF + 0.1µF).
MAX195BCWE+ 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:
- 16
- 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:
- -
MAX195BCWE+ FAQ
1.How can I place an order for MAX195BCWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX195BCWE+ 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 MAX195BCWE+ reliable?
The price and inventory of MAX195BCWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX195BCWE+ is usually 5 days.
3.What payment methods are accepted for MAX195BCWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX195BCWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX195BCWE+?
MAX195BCWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX195BCWE+ 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 MAX195BCWE+?
For technical support, including MAX195BCWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX195BCWE+ requirements.
6.How does Aetrix verify that MAX195BCWE+ is sourced from the original manufacturer or authorized distributors?
All MAX195BCWE+ 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 MAX195BCWE+ meets industry standards.
7.What is the process for return or replacement of MAX195BCWE+?
All MAX195BCWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX195BCWE+, 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 MAX195BCWE+ part is unused and in its original packaging.
Return procedure for MAX195BCWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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