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Analog Devices Inc./Maxim Integrated MAX195BCWE+T
- Part No.:
- MAX195BCWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX195BCWE+T.pdf
- Description:
- IC ADC 16BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,960
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Product details
Overview
MAX195BCWE+T from Maxim Integrated is a 16-bit successive-approximation ADC with 85ksps sampling rate, 9.4µs conversion time, ±3LSB integral nonlinearity, and 10µA shutdown current. It features pin-selectable unipolar (0V to VREF) or bipolar (–VREF to +VREF) input range, built-in track/hold, and separate analog/digital supplies for noise isolation-used in portable instrumentation and medical signal acquisition.
For engineers reviewing the MAX195BCWE+T datasheet, MAX195BCWE+T pinout, MAX195BCWE+T application, or MAX195BCWE+T equivalent, key selection considerations include its SAR architecture, dual-supply operation (±5V), serial interface timing at up to 5Mbps, and calibration-corrected DC accuracy over 0°C to +70°C.
Technical Context
The MAX195BCWE+T implements a capacitive-DAC SAR architecture with 16 binary-weighted capacitors plus one dummy LSB capacitor. Calibration uses ten dedicated DACs to correct MSB array errors, storing compensation codes digitally for temperature-stable linearity without external trim.
Its digital interface supports two serial read modes: synchronous bit-by-bit output during conversion (CLK-driven) or asynchronous post-conversion readout (SCLK-driven, up to 5MHz). The BP/UP/SHDN pin configures input range or enables 10µA shutdown-floating = bipolar, high = unipolar, low = shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits - guarantees no missing codes across full scale, enabling precise measurement of small signal changes. |
| Sampling Rate | 85ksps - supports real-time capture of audio-band and vibration signals without aliasing up to 42.5kHz. |
| SINAD | 90dB (typ) - delivers >14.9 effective number of bits (ENOB) for high-fidelity signal digitization. |
| Conversion Time | 9.4µs - defines minimum inter-conversion interval; enables continuous sampling at maximum throughput. |
| INL | ±3LSB (max) - limits absolute code error to <0.046% of full scale, critical for calibrated transducer systems. |
| Shutdown Current | 10µA (max) - reduces system power by >99% during idle periods, essential for battery-powered instruments. |
| Input Range | Pin-selectable unipolar (0V to VREF) or bipolar (–VREF to +VREF) - eliminates need for external level-shifting circuitry. |
Pinout & Package
MAX195BCWE+T is housed in a 16-pin wide SO (Small Outline) package with 300mil body width and standard 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BP/UP/SHDN) | Bipolar/Unipolar/Shutdown control | Three-state logic input: floating = bipolar mode, VDDA = unipolar, 0V = 10µA shutdown. |
| 2 (CLK) | Conversion clock input | Drives internal SAR logic; 1.7MHz max frequency with 25–75% duty cycle required for full-spec operation. |
| 3 (SCLK) | Serial clock input | Asynchronous clock for post-conversion data readout; supports up to 5MHz for 16-bit transfer in ≤3.2µs. |
| 4 (VDDD) | +5V digital supply | Power for digital logic and serial interface; must be decoupled locally to minimize switching noise coupling. |
| 5 (DOUT) | Serial data output | Three-state MSB-first output enabled only when CS is low; compatible with SPI/QSPI framing. |
| 6 (DGND) | Digital ground reference | Separate from AGND to prevent digital return currents from modulating analog reference paths. |
| 7 (EOC) | End-of-conversion indicator | Active-high pulse signals completion; used to trigger interrupts or auto-restart conversions via CONV tieback. |
| 8 (CS) | Chip select input | Active-low enable for DOUT three-state buffer and serial interface; allows multi-device bus sharing. |
| 9 (CONV) | Convert-start input | Falling-edge-triggered; initiates acquisition and conversion sequence synchronized to CLK edge. |
| 10 (RESET) | Calibration reset input | Rising edge triggers full internal calibration (8.2ms at 1.7MHz); halts operation when held low. |
| 11 (VSSD) | –5V digital supply | Negative rail for digital logic; requires symmetric decoupling with VDDD to maintain logic threshold stability. |
| 12 (REF) | Reference voltage input | Accepts 0V to +5V; drives 1000pF+ dynamic load during conversion; requires low-impedance buffering. |
| 13 (AIN) | Analog input | Capacitive input (250pF unipolar); accepts ±5V bipolar or 0–5V unipolar range depending on BP/UP/SHDN state. |
| 14 (AGND) | Analog ground reference | Star-point ground for analog section; must be isolated from DGND except at single-point system ground. |
| 15 (VSSA) | –5V analog supply | Negative rail for analog front-end; matched to VSSD to preserve common-mode rejection in differential paths. |
| 16 (VDDA) | +5V analog supply | Positive rail for analog circuitry; powers internal DAC and comparator; requires ultra-low-noise regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in track/hold | Capacitive-DAC architecture inherently samples and holds input during acquisition-no external THS required. |
| Auto-calibration | Digitally stores per-capacitor correction codes at power-up or RESET; maintains ±3LSB INL over 0°C to +70°C. |
| Separate analog/digital supplies | VDDA/VSSA and VDDD/VSSD rails isolate noise-sensitive analog core from digital switching transients. |
| Three-state serial output | DOUT tri-states when CS is high, enabling direct connection to shared microcontroller SPI buses without buffers. |
| Pin-selectable input range | Single BP/UP/SHDN pin configures bipolar (±VREF), unipolar (0–VREF), or shutdown-reducing BOM count. |
Applications
| Portable Instruments | Medical Signal Acquisition |
|---|---|
Use Scenario: Handheld multimeters and 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-panel controls; operates in low-power shutdown between readings. Use Value: 16-bit resolution and ±3LSB INL ensure traceable calibration against NIST standards; 10µA shutdown extends AA-battery life to >1 year in sleep mode. |
Use Scenario: ECG and EEG front-ends where low noise and DC accuracy are critical for arrhythmia detection. IC Role / Device Role / Timing Role: Analog-to-digital interface for instrumentation amplifiers; converts amplified biopotentials at 85ksps with bipolar ±5V input range. Use Value: 90dB SINAD preserves signal integrity for 12-bit+ effective resolution; built-in calibration eliminates drift-induced false positives in long-duration monitoring. |
| Industrial Controls | Vibrations Analysis |
Use Scenario: PLC analog input modules measuring 4–20mA loop signals and thermocouple outputs in factory automation. IC Role / Device Role / Timing Role: High-accuracy ADC in isolated signal chains; interfaces to microcontrollers via SPI with EOC interrupt support. Use Value: Separate AGND/DGND and ±5V dual supplies reject common-mode noise from motor drives; unipolar/bipolar flexibility simplifies hardware variants. |
Use Scenario: Predictive maintenance sensors on rotating machinery capturing broadband acceleration waveforms. IC Role / Device Role / Timing Role: High-speed digitizer for piezoelectric accelerometers; samples at 85ksps with 9.4µs conversion to resolve transient impacts. Use Value: 85ksps sustained rate captures harmonics up to 42.5kHz; 90dB SINAD enables detection of sub-millig acceleration anomalies buried in noise. |
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 (2.5–5V), no internal reference, 1.5µA shutdown. | Higher speed but lacks bipolar input and auto-calibration; requires external reference and precision op-amps. | Choose for high-throughput, single-supply systems where board space is constrained and calibration is managed externally. |
| AD7606BSTZ | 16-bit, 200kSPS, simultaneous sampling, integrated reference, ±10V input range, 25mW active power. | Multi-channel (8-ch), oversampling-capable, but larger footprint and higher power; no shutdown mode. | Choose for multi-sensor data loggers needing channel synchronization and factory-trimmed reference stability. |
Compared with ADS8860IDRCT and AD7606BSTZ, the MAX195BCWE+T uniquely combines pin-selectable bipolar/unipolar input, self-calibration, and ultra-low 10µA shutdown-making it optimal for portable, single-channel, battery-sensitive applications demanding guaranteed monotonicity and minimal external components.
Availability
MAX195BCWE+T is available at Aetrix Electronics and suitable for portable instrumentation, medical signal acquisition, industrial controls, and vibrations analysis requiring stable component supply across extended production lifecycles.
Supply support for MAX195BCWE+T 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 MAX195BCWE+T belongs to Maxim's high-accuracy SAR ADC product line, engineered specifically for applications requiring guaranteed 16-bit performance without external calibration-targeting portable test equipment and clinical-grade biosensors.
FAQ
What is the operating temperature range for the MAX195BCWE+T?
The MAX195BCWE+T is specified for operation from 0°C to +70°C. This commercial-grade temperature range is confirmed in the Ordering Information table, where MAX195BCWE denotes the "C" grade (0°C to +70°C) in a 16-pin wide SO package. Performance parameters including INL (±3LSB), SINAD (90dB), and conversion time (9.4µs) are guaranteed across this full range after internal calibration.
Does the MAX195BCWE+T require an external reference voltage?
Yes, the MAX195BCWE+T requires an external reference voltage applied to the REF pin. It accepts 0V to +5V (up to VDDA), and performance specifications assume a stable, low-impedance reference-such as a buffered MAX6241 or MAX874 with 1µF low-ESR + 0.1µF ceramic bypass. The device does not include an internal reference; REF directly sets full-scale range for both unipolar and bipolar modes.
How does the BP/UP/SHDN pin configure input range and shutdown on the MAX195BCWE+T?
On the MAX195BCWE+T, Pin 1 (BP/UP/SHDN) is a three-level control: left floating → bipolar input range (–VREF to +VREF); tied to VDDA → unipolar range (0V to VREF); pulled to 0V → 10µA shutdown mode. This single pin eliminates external logic or jumpers, enabling hardware-configurable signal conditioning and ultra-low-power standby in portable systems.
What serial interface protocols does the MAX195BCWE+T support?
The MAX195BCWE+T supports SPI-compatible serial communication using two independent clocks: CLK for synchronous bit-read during conversion, and SCLK for asynchronous post-conversion readout (up to 5MHz). It is explicitly documented as compatible with SPI™ and QSPI™ interfaces, with configurable CPOL/CPHA modes (Figures 6 and 7), and requires only CS, DOUT, CLK/SCLK, and EOC for full functionality.
Is calibration required before first use of the MAX195BCWE+T?
Yes, the MAX195BCWE+T performs automatic calibration on power-up, completing in ~8.2ms at 1.7MHz CLK. If supply voltages settle slowly (>500ns), calibration may be incomplete-requiring a manual RESET pulse to reinitialize. Recalibration is recommended after significant ambient temperature shifts (>10°C) or reference voltage changes, as stored digital correction codes compensate for analog drift in the capacitor DAC array.
MAX195BCWE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX195BCWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX195BCWE+T 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+T reliable?
The price and inventory of MAX195BCWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX195BCWE+T is usually 5 days.
3.What payment methods are accepted for MAX195BCWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX195BCWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX195BCWE+T?
MAX195BCWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX195BCWE+T 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+T?
For technical support, including MAX195BCWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX195BCWE+T requirements.
6.How does Aetrix verify that MAX195BCWE+T is sourced from the original manufacturer or authorized distributors?
All MAX195BCWE+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX195BCWE+T?
All MAX195BCWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX195BCWE+T, 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+T part is unused and in its original packaging.
Return procedure for MAX195BCWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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