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Analog Devices Inc./Maxim Integrated MAX194BCPE
- Part No.:
- MAX194BCPE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX194BCPE.pdf
- Description:
- IC ADC 14BIT SAR 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,019
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Product details
Overview
MAX194BCPE 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 internal calibration, built-in track/hold, and pin-selectable unipolar (0V to VREF) or bipolar (–VREF to +VREF) input range - used in portable instrumentation and medical signal acquisition where precision, low power, and dual-range flexibility are critical.
For engineers reviewing the MAX194BCPE datasheet, MAX194BCPE pinout, MAX194BCPE application, or MAX194BCPE equivalent, this page delivers verified technical context, real-world design meaning for each specification, validated pin functions, confirmed alternatives, and supply-chain support tailored for embedded data-acquisition systems requiring stable 14-bit performance across 0°C to +70°C.
Technical Context
The MAX194BCPE implements a capacitive-DAC SAR architecture with integrated calibration DACs per MSB capacitor, enabling automatic on-power-up and RESET-triggered correction of linearity and offset errors over temperature. Its 9.4µs conversion time and inherent track/hold function eliminate external sample-and-hold circuitry.
It supports two serial readout modes: synchronous bit-by-bit output during conversion (at CLK rate) or high-speed post-conversion streaming (up to 5Mbps via SCLK), with EOC framing and CS-controlled three-state DOUT. Dual isolated supplies (VDDA/VSSA and VDDD/VSSD) minimize digital noise coupling into analog paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 distinct digital codes for high-fidelity signal digitization in medical and industrial sensors. |
| Sampling Rate | 85ksps - enables real-time capture of audio-band and vibration signals up to ~40kHz without aliasing. |
| INL | ±1⁄2 LSB - ensures monotonicity and <0.006% full-scale linearity error, critical for closed-loop control feedback accuracy. |
| SINAD | 82dB - corresponds to ~13.6 effective bits at 1kHz input, supporting high-fidelity audio and spectral analysis. |
| Conversion Time | 9.4µs - defines minimum inter-conversion interval; allows continuous full-speed operation when EOC drives CONV. |
| Shutdown Current | 10µA - reduces system standby power by >99% vs active mode (9.2mA typical), ideal for battery-powered instruments. |
| Input Range | Pin-selectable unipolar (0V to VREF) or bipolar (–VREF to +VREF) - simplifies interface to transducers with varying DC offsets or AC-coupled sources. |
Pinout & Package
MAX194BCPE is housed in a 16-pin plastic DIP package (0°C to +70°C operating range), with through-hole mounting and 0.3-inch body width. Pin layout follows standard DIP numbering (1–8 top row left-to-right, 9–16 bottom row right-to-left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BP/UP/SHDN) | Bipolar/Unipolar/Shutdown select | Floating = bipolar input range; +5V = unipolar; 0V = 10µA shutdown - single pin configures core analog behavior and power state. |
| 2 (CLK) | Conversion clock input | Drives SAR logic and internal timing; 1.7MHz max frequency sets 9.4µs conversion time - must be gated or synchronized with CONV. |
| 3 (SCLK) | Serial clock input | Controls post-conversion data readout at up to 5MHz - decoupled from CLK, enabling flexible µP interface timing. |
| 4 (VDDD) | +5V digital supply | Power for serial interface, control logic, and DOUT driver - isolated from analog supplies to prevent digital noise injection. |
| 5 (DOUT) | Serial data output | Three-state MSB-first output (14 data + 2 sub-LSBs); enabled only when CS is low - prevents bus contention in multi-device systems. |
| 7 (EOC) | End-of-conversion output | Active-high pulse marks conversion/calibration completion; can interrupt µP or directly drive CONV for continuous mode. |
| 8 (CS) | Chip-select input | Active-low enable for serial interface and DOUT - essential for SPI-compatible daisy-chaining or shared bus operation. |
| 9 (CONV) | Convert-start input | Falling-edge triggered; initiates acquisition and conversion - requires precise timing relative to CLK edges per Figures 3–4. |
| 10 (RESET) | Reset input | Active-low halts operation; rising edge triggers full calibration - used to correct drift after supply/temperature shifts. |
| 12 (REF) | Reference voltage input | 0V to +5V range sets full-scale; drives >1000pF dynamic load - requires low-impedance source (e.g., buffered reference + 47µF/0.1µF bypass). |
| 13 (AIN) | Analog input | Accepts unipolar (0V–VREF) or bipolar (–VREF–+VREF) signals; input capacitance 250pF - needs proper driving impedance for settling. |
| 14 (AGND) | Analog ground | Return path for AIN, REF, VDDA, VSSA - must be star-connected and separated from DGND to maintain 82dB SINAD. |
| 15 (VSSA) | –5V analog supply | Negative rail for analog section; paired with VDDA (+5V) to support true bipolar input range and rail-to-rail comparator swing. |
| 16 (VDDA) | +5V analog supply | Positive analog rail; powers SAR, DAC, and comparator - independent of VDDD to isolate analog integrity from digital switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Internal calibration | Corrects INL and offset errors across 0°C to +70°C without external trims - maintains ±1⁄2 LSB INL and ±2 LSB full-scale error over temperature. |
| Capacitive-DAC track/hold | Eliminates need for external S/H IC; acquires input in 2.4µs with four CLK cycles - reduces BOM count and board area in portable designs. |
| Dual-supply isolation | VDDA/VSSA and VDDD/VSSD separation suppresses digital noise coupling - preserves 82dB SINAD even with noisy µP environments. |
| Flexible serial interface | Supports both CLK-synchronous (during conversion) and SCLK-asynchronous (between conversions) readout - adapts to µP timing constraints. |
| Pin-compatible upgrade path | Shares pinout and serial protocol with 16-bit MAX195 - allows resolution scaling without PCB redesign in existing layouts. |
Applications
| Portable Instrumentation | Medical Signal Acquisition |
|---|---|
|
Use Scenario: Handheld multimeters and portable oscilloscopes acquiring sensor data under battery power. IC Role / Device Role / Timing Role: Primary ADC digitizing analog front-end outputs with 14-bit resolution and low power consumption. Use Value: 10µA shutdown extends battery life; 85ksps sampling captures transient events; bipolar range handles AC-coupled transducer outputs. |
Use Scenario: ECG and EEG monitors digitizing low-amplitude bio-signals with minimal added noise. IC Role / Device Role / Timing Role: High-SINAD ADC converting conditioned analog waveforms while rejecting digital supply noise. Use Value: 82dB SINAD ensures clean spectral representation; ±1⁄2 LSB INL preserves waveform fidelity; isolated supplies prevent µP noise corruption. |
| Industrial Process Control | Vibration Analysis Systems |
|
Use Scenario: PLC I/O modules measuring pressure, temperature, and flow sensor outputs in factory environments. IC Role / Device Role / Timing Role: Precision ADC interfacing to instrumentation amplifiers with ratiometric or external references. Use Value: Internal calibration maintains accuracy across wide temperature swings; unipolar/bipolar selection accommodates diverse sensor output types. |
Use Scenario: Predictive maintenance units capturing motor/gearbox vibration spectra for FFT-based fault detection. IC Role / Device Role / Timing Role: High-speed data acquisition ADC feeding DSP engines with time-domain samples. Use Value: 9.4µs conversion time enables >85k samples/sec; 14-bit resolution resolves fine spectral peaks; low THD (–90dB) avoids harmonic masking. |
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 |
|---|---|---|---|
| ADS8320U | 16-bit resolution, 100ksps, SPI interface, single +5V supply (no ±5V rails required) | Eliminates dual-supply design complexity but lacks bipolar input flexibility and internal calibration | Select when higher resolution and simplified power design outweigh need for auto-calibration and true bipolar range. |
| AD7892BRZ | 14-bit, 200ksps, no internal calibration, requires external reference and track/hold, CMOS process | Higher speed but demands more external components and manual trimming for DC accuracy | Select when maximum throughput is critical and system-level calibration routines can compensate for drift. |
Compared with ADS8320U and AD7892BRZ, the MAX194BCPE uniquely combines internal calibration, bipolar/unipolar configurability, and dual-supply noise isolation - making it optimal for portable, battery-operated, or thermally variable systems where long-term DC accuracy and analog flexibility are non-negotiable.
Availability
MAX194BCPE is available at Aetrix Electronics and suitable for portable instrumentation, medical signal acquisition, and industrial process control requiring stable component supply across commercial temperature range (0°C to +70°C) with full traceability.
Supply support for MAX194BCPE 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 - emphasizing integration, reliability, and performance-per-watt.
The MAX194BCPE belongs to Maxim's high-accuracy SAR ADC product line, engineered specifically for portable and embedded data-acquisition systems needing calibrated 14-bit performance without external support circuitry.
FAQ
What is the operating temperature range for the MAX194BCPE?
The MAX194BCPE is rated for 0°C to +70°C operation, as indicated by the 'C' suffix in its part number. This commercial-grade temperature range is validated across all electrical specifications including ±1⁄2 LSB INL, 82dB SINAD, and 10µA shutdown current - ensuring consistent performance in office, lab, and controlled industrial environments where ambient temperatures remain within this span.
Does the MAX194BCPE require an external reference voltage?
Yes, the MAX194BCPE requires an external reference voltage applied to the REF pin, with a range of 0V to VDDA (typically +5V). The device does not include an internal reference; instead, it relies on a stable, low-impedance external source - such as a buffered precision reference (e.g., MAX6241) with 47µF + 0.1µF bypassing - to achieve its specified 82dB SINAD and ±1⁄2 LSB INL performance.
How does the BP/UP/SHDN pin configure input range and power state?
The BP/UP/SHDN pin on the MAX194BCPE serves three distinct functions: when left floating, it selects bipolar input range (–VREF to +VREF); when pulled to +5V (VDDD), it selects unipolar range (0V to VREF); and when pulled to 0V (GND), it activates 10µA shutdown mode. This single pin eliminates external logic or jumpers for mode selection - simplifying PCB layout and firmware configuration in multi-range systems.
Can the MAX194BCPE operate with a single +5V supply?
No, the MAX194BCPE requires dual analog supplies: +5V (VDDA) and –5V (VSSA) to support its true bipolar input range and internal comparator operation. Digital supplies (VDDD/VSSD) also require ±5V. Using only +5V and GND will prevent proper bipolar conversion and may violate absolute maximum ratings - confirmed by the datasheet's VSSA specification of –5.25V to –4.75V and functional diagram showing negative rail dependency.
What is the purpose of the calibration function in the MAX194BCPE?
The MAX194BCPE performs automatic calibration at power-up and upon RESET assertion to correct capacitor-matching errors in its capacitive-DAC array. This process stores digital compensation codes for each MSB capacitor, reducing INL from >±4 LSB to ±1⁄2 LSB and stabilizing offset over temperature - eliminating need for external trims and maintaining 14-bit accuracy without user intervention across 0°C to +70°C.
MAX194BCPE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX194BCPE FAQ
1.How can I place an order for MAX194BCPE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX194BCPE 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 MAX194BCPE reliable?
The price and inventory of MAX194BCPE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX194BCPE is usually 5 days.
3.What payment methods are accepted for MAX194BCPE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX194BCPE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX194BCPE?
MAX194BCPE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX194BCPE 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 MAX194BCPE?
For technical support, including MAX194BCPE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX194BCPE requirements.
6.How does Aetrix verify that MAX194BCPE is sourced from the original manufacturer or authorized distributors?
All MAX194BCPE 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 MAX194BCPE meets industry standards.
7.What is the process for return or replacement of MAX194BCPE?
All MAX194BCPE units undergo pre-shipment inspection (PSI). If there is an issue with MAX194BCPE, 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 MAX194BCPE part is unused and in its original packaging.
Return procedure for MAX194BCPE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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