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Analog Devices Inc./Maxim Integrated MAX195BEWE+
- Part No.:
- MAX195BEWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX195BEWE+.pdf
- Description:
- IC ADC 16BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,582
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Product details
Overview
MAX195BEWE+ from Maxim Integrated is a 16-bit successive-approximation analog-to-digital converter (ADC) with 85ksps sampling rate, 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 MAX195BEWE+ datasheet, MAX195BEWE+ pinout, MAX195BEWE+ application, or MAX195BEWE+ equivalent, this page delivers verified electrical specs, package mapping, functional pin roles, real-world use cases, and two confirmed alternative parts with documented technical and application differences.
Technical Context
The MAX195BEWE+ implements a capacitive-DAC SAR architecture with integrated calibration DACs per MSB capacitor to correct linearity and offset errors across temperature. Its internal track/hold function is inherent to the sampling capacitor array, eliminating external hold circuitry.
It supports dual serial data readout modes: synchronous bit-by-bit output during conversion at CLK (up to 1.7MHz), or asynchronous post-conversion readout via SCLK (up to 5MHz). The BP/UP/SHDN pin configures input range or enables 10µA shutdown without external control logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits - guarantees no missing codes and full 16-bit monotonicity over temperature. |
| Sampling Rate | 85ksps - maximum sustained throughput enabled by 9.4µs conversion time and 4-cycle acquisition. |
| SINAD | 90dB - measured at fs = 85kHz, bipolar input, enabling high-fidelity audio and vibration analysis. |
| Input Range | Pin-selectable: 0V to VREF (unipolar) or −VREF to +VREF (bipolar) - eliminates need for external level-shifting circuitry. |
| Shutdown Current | 10µA max - reduces system power in battery-operated portable instruments between measurements. |
| Supply Separation | Independent VDDA/VSSA and VDDD/VSSD rails - minimizes digital switching noise coupling into analog path. |
| Reference Input | 0V to VDDA (≤ +5V) - allows ratiometric operation using the +5V analog supply when precision reference is unnecessary. |
Pinout & Package
MAX195BEWE+ is housed in a 16-pin wide SO (Small Outline) package, -40°C to +85°C operating temperature range, JEDEC MS-013AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BP/UP/SHDN | Mode control input | Floating = bipolar input range; VDD = unipolar; 0V = 10µA shutdown - single-pin configuration of core ADC behavior. |
| 2: CLK | Conversion clock input | Drives SAR logic and internal timing; 1.7MHz max frequency defines minimum conversion time (9.4µs). |
| 3: SCLK | Serial clock input | Asynchronous clock for post-conversion data readout up to 5MHz - decouples digital interface from conversion timing. |
| 4: VDDD | +5V digital supply | Power source for digital logic, CS, CONV, RESET, DOUT, EOC - must be isolated from analog ground to prevent noise injection. |
| 5: DOUT | Serial data output | Three-state, MSB-first output enabled only when CS is low - supports daisy-chaining or shared bus architectures. |
| 6: DGND | Digital ground | Return path for VDDD and digital I/O; must be connected to system digital ground plane, not AGND. |
| 7: EOC | End-of-conversion output | Active-high pulse signals completion; used to trigger interrupts or auto-restart conversion by connecting to CONV. |
| 8: CS | Chip select input | Active-low enable for DOUT three-state buffer and serial interface - essential for multi-device SPI-like communication. |
| 9: CONV | Convert-start input | Falling-edge triggered; initiates conversion after track/hold acquisition - synchronizable with CLK or EOC for continuous mode. |
| 10: RESET | Reset/calibration input | Rising edge triggers full internal calibration (8.2ms); halts operation when held low - required after supply transients or major environmental shifts. |
| 11: VSSD | -5V digital supply | Negative rail for digital logic; paired with VDDD to support true ±5V digital signaling and noise margin. |
| 12: REF | Reference voltage input | 0V to VDDA range; drives main and calibration DAC arrays - requires low-impedance source and 1µF + 0.1µF bypassing. |
| 13: AIN | Analog input | Capacitive input (250pF unipolar); accepts 0V–VREF or ±VREF based on BP/UP/SHDN - no external buffer needed for moderate-Z sources. |
| 14: AGND | Analog ground | Return for VDDA, VSSA, AIN, REF; must be star-connected to minimize ground loop error in precision measurement. |
| 15: VSSA | -5V analog supply | Negative analog rail; powers comparator, calibration DACs, and analog front-end - critical for bipolar input accuracy. |
| 16: VDDA | +5V analog supply | Positive analog rail; powers main DAC, comparator, and analog circuitry - must be low-noise and well-bypassed. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in track/hold | Capacitive-DAC architecture inherently samples and holds input during conversion - removes external THS requirement and board space. |
| Auto-calibration | On-power-up and RESET-initiated calibration corrects offset and INL errors across temperature - maintains 16-bit linearity without manual trim. |
| Pin-selectable input range | Single BP/UP/SHDN pin configures unipolar, bipolar, or shutdown - simplifies PCB design and firmware logic vs. register-based alternatives. |
| Three-state serial output | DOUT floats when CS is high - enables direct connection to shared microcontroller SPI buses without external buffers or muxes. |
| Separate analog/digital supplies | VDDA/VSSA and VDDD/VSSD isolation reduces PSRR degradation - achieves 65dB PSRR (VDDA/VSSA) and clean 90dB SINAD in mixed-signal systems. |
Applications
| Portable Instruments | Medical Signal Acquisition |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscopes requiring high-resolution DC and AC measurements with battery life optimization. IC Role / Device Role / Timing Role: Primary data converter capturing sensor outputs and front-end amplifier signals at up to 85ksps with minimal external components. Use Value: 10µA shutdown mode extends battery runtime between measurements; 90dB SINAD ensures accurate waveform reconstruction in noisy field environments. |
Use Scenario: ECG, EEG, and EMG acquisition systems where low noise, high linearity, and DC stability are critical for diagnostic fidelity. IC Role / Device Role / Timing Role: High-accuracy analog front-end digitizer interfacing with instrumentation amplifiers and anti-alias filters. Use Value: Auto-calibration maintains <±3 LSB INL over −40°C to +85°C; bipolar input range directly accepts differential bio-potential signals without level-shifting. |
| Vibration Analysis | Industrial Controls |
Use Scenario: Predictive maintenance sensors monitoring bearing wear, motor imbalance, and structural resonance in factory equipment. IC Role / Device Role / Timing Role: High-speed digitizer capturing broadband acceleration waveforms for FFT-based spectral analysis. Use Value: 85ksps sampling supports >40kHz Nyquist bandwidth; 9.4µs conversion time enables tight deterministic timing for synchronized multi-channel capture. |
Use Scenario: Programmable logic controller (PLC) analog input modules measuring process variables like pressure, temperature, and flow. IC Role / Device Role / Timing Role: Precision ADC in isolated I/O submodules handling 4–20mA loop receivers and RTD/thermocouple signal conditioning. Use Value: Separate AGND/DGND and supply rails suppress noise from industrial switching loads; unipolar/bipolar flexibility accommodates diverse sensor outputs. |
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 |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1MSPS, single-supply (2.5–3.6V), no internal reference, requires external REF - higher speed but narrower supply range and no bipolar mode. | Best for battery-powered, high-throughput data loggers needing >100ksps; unsuitable for ±5V industrial or bipolar sensor interfaces. | Select ADS8860IDRCT only if system uses 3.3V logic, demands >100ksps, and can provide precision external reference and unipolar-only signal chain. |
| AD7606C-16BSTZ | 16-bit, 1MSPS, simultaneous sampling (8-channel), integrated reference and analog front-end - larger footprint, higher power (120mW), no shutdown mode. | Targeted at multi-channel DAQ systems (e.g., motor drive monitoring); lacks ultra-low-power shutdown and single-channel optimization. | Choose AD7606C-16BSTZ when acquiring 4+ channels simultaneously with matched timing; avoid for single-channel portable designs where MAX195BEWE+'s 10µA shutdown is essential. |
Compared with ADS8860IDRCT and AD7606C-16BSTZ, the MAX195BEWE+ uniquely balances ultra-low shutdown current, ±5V dual-supply operation, pin-selectable bipolar/unipolar range, and self-calibrating 16-bit accuracy - making it optimal for portable, battery-sensitive, and industrial bipolar-sensing applications where integration and power efficiency outweigh raw speed.
Availability
MAX195BEWE+ is available at Aetrix Electronics and suitable for portable instrumentation, medical signal acquisition, vibration analysis, and industrial controls requiring stable component supply across extended temperature ranges.
Supply support for MAX195BEWE+ 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 and mixed-signal ICs for demanding industrial, medical, and communications applications.
The MAX195BEWE+ belongs to Maxim's high-accuracy SAR ADC product line, engineered for applications requiring guaranteed 16-bit no-missing-codes performance, low power, and robust operation in harsh thermal environments.
FAQ
What is the operating temperature range of the MAX195BEWE+?
The MAX195BEWE+ is rated for −40°C to +85°C operation, as confirmed in the Ordering Information table and Absolute Maximum Ratings section. This extended industrial temperature range supports deployment in portable test equipment, factory-floor controllers, and outdoor medical devices where ambient conditions vary widely. The internal calibration circuitry maintains full 16-bit linearity across this entire span without external trimming.
Does the MAX195BEWE+ require an external reference voltage?
The MAX195BEWE+ requires an external reference voltage applied to the REF pin, with a valid range of 0V to VDDA (up to +5V). While a precision reference like the MAX6241 is recommended for full 16-bit DC accuracy, the device also supports ratiometric operation using the +5V analog supply (VDDA) when paired with a low-impedance 1µF + 0.1µF bypass network - enabling cost-effective designs where absolute accuracy is secondary to noise immunity.
How does the BP/UP/SHDN pin configure the MAX195BEWE+?
The BP/UP/SHDN pin on the MAX195BEWE+ serves three distinct functions: left floating, it selects bipolar input range (−VREF to +VREF); tied to VDD, it selects unipolar range (0V to VREF); pulled to 0V, it activates 10µA shutdown mode. This single-pin configurability eliminates the need for firmware-controlled registers or external logic, simplifying hardware design and reducing BOM count in resource-constrained systems.
What is the purpose of the RESET pin on the MAX195BEWE+?
The RESET pin on the MAX195BEWE+ initiates full internal calibration on its rising edge, which takes approximately 8.2ms at 1.7MHz CLK. Calibration corrects offset and integral nonlinearity errors caused by temperature drift, supply variation, or reference shifts. Holding RESET low halts all conversion activity. Recalibration is recommended after significant ambient temperature changes or supply voltage shifts to maintain <±3 LSB INL performance.
Can the MAX195BEWE+ interface directly with a microcontroller SPI bus?
Yes, the MAX195BEWE+ supports SPI-compatible serial communication via CS, SCLK, and DOUT pins. Its three-state DOUT output enables direct connection to shared microcontroller SPI buses without external buffers. Data is output MSB-first, and the device supports both modes: reading bits during conversion (synchronized to CLK) or reading post-conversion (synchronized to SCLK up to 5MHz), providing flexibility for timing-constrained or interrupt-driven firmware architectures.
MAX195BEWE+ 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX195BEWE+ FAQ
1.How can I place an order for MAX195BEWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX195BEWE+ 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 MAX195BEWE+ reliable?
The price and inventory of MAX195BEWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX195BEWE+ is usually 5 days.
3.What payment methods are accepted for MAX195BEWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX195BEWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX195BEWE+?
MAX195BEWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX195BEWE+ 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 MAX195BEWE+?
For technical support, including MAX195BEWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX195BEWE+ requirements.
6.How does Aetrix verify that MAX195BEWE+ is sourced from the original manufacturer or authorized distributors?
All MAX195BEWE+ 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 MAX195BEWE+ meets industry standards.
7.What is the process for return or replacement of MAX195BEWE+?
All MAX195BEWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX195BEWE+, 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 MAX195BEWE+ part is unused and in its original packaging.
Return procedure for MAX195BEWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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