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Analog Devices Inc./Maxim Integrated MAX191BCNG+
- Part No.:
- MAX191BCNG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX191BCNG+.pdf
- Description:
- IC ADC 12BIT SAR 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:173
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Product details
Overview
MAX191BCNG+ from Maxim Integrated is a 12-bit successive-approximation ADC with differential pseudo-differential analog inputs, integrated track/hold, internal 4.096V reference with REFADJ trim input, and dual serial/parallel µP interface. It delivers 100ksps guaranteed sample rate, 7.5µs conversion time, and operates from single +5V or dual ±5V supplies - enabling ground-referenced bipolar signal acquisition in portable data loggers and PC digitizers.
For engineers reviewing the MAX191BCNG+ datasheet, MAX191BCNG+ pinout, MAX191BCNG+ application, or MAX191BCNG+ equivalent, this page provides verified electrical parameters, validated package mapping (24-pin narrow plastic DIP), confirmed interface timing modes (slow-memory/ROM/serial), and two field-tested alternative parts for design continuity.
Technical Context
The MAX191BCNG+ implements a SAR architecture with on-chip track/hold and internal bandgap reference buffered to VREF. Its analog front-end supports pseudo-differential sampling with AIN+/AIN− inputs, where AIN− must remain stable within ±0.5LSB relative to AGND during conversion - enforced by external 0.1µF decoupling.
Digital control uses three distinct interface configurations: parallel mode (with HBEN-selectable high/low byte output), serial mode (SPI/QSPI/MICROWIRE-compatible with SCLKOUT/SSTRB/DOUT), and synchronous clocking via internal oscillator (120pF capacitor) or external 100kHz–1.6MHz TTL/CMOS clock. Power-down mode reduces IDD from 3mA to 50µA while retaining reference functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB = 1 part in 4096 full-scale accuracy for precision sensor digitization. |
| Sampling Rate | 100ksps guaranteed - supports real-time capture of signals up to 50kHz Nyquist bandwidth. |
| Conversion Time | 7.5µs - enables deterministic timing control in µP-driven acquisition loops. |
| Integral Nonlinearity | ±1 LSB (MAX191B grade) - ensures monotonicity and <0.025% end-point error across full range. |
| Reference Voltage | 4.096V internal (±20mV at +25°C) - matches standard 12-bit full-scale codes (0–4095) without external scaling. |
| Supply Range | +5V single or ±5V dual - allows direct interfacing to bipolar transducer outputs without level-shifting circuitry. |
| Power-Down Current | 50µA max - extends battery life in intermittent-sampling applications like environmental monitors. |
Pinout & Package
MAX191BCNG+ is housed in a 24-pin narrow plastic DIP (0.300" width), RoHS-compliant and socket-compatible with legacy industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 24) | Positive supply rail | Accepts +5V ±5%; powers analog core, reference, and digital logic - requires 4.7µF bulk + 0.1µF ceramic decoupling. |
| VSS (Pin 1) | Negative supply rail | Accepts 0V or –5V ±5%; enables true bipolar input range (±VREF) when used with dual supply. |
| AIN+ (Pin 2), AIN− (Pin 3) | Differential analog inputs | Pseudo-differential architecture: only AIN+ is actively held; AIN− must be stabilized to AGND within ±0.5LSB using 0.1µF capacitor. |
| AGND (Pin 4), DGND (Pin 12) | Analog/digital ground returns | Separate ground pins prevent digital switching noise from corrupting analog measurements - require star grounding at single point. |
| REFADJ (Pin 15), VREF (Pin 16) | Reference adjustment/output | REFADJ accepts 2.5V–5.0V trim voltage; VREF outputs 4.096V ±20mV - adjustable gain calibration eliminates system-level offset errors. |
| CS (Pin 19), RD (Pin 18), HBEN (Pin 20) | Parallel interface controls | CS/RD falling edge initiates conversion in slow-memory mode; HBEN selects MSB/LSB byte output on D7–D0 bus. |
| CLK/SCLK (Pin 22), BUSY (Pin 5) | Timing synchronization | CLK accepts external clock or drives internal oscillator; BUSY low indicates active conversion - critical for µP polling or interrupt-driven reads. |
| PD (Pin 6) | Power-down enable | Logic low disables ADC core (IDD → 50µA) while preserving VREF stability - ideal for sleep/wake cycles in battery-powered systems. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 4.096V reference with REFADJ | Enables system-level gain calibration: ±100ppm/°C tempco and 2.5V–5.0V trim range correct for sensor drift and PCB trace resistance. |
| Bipolar/unipolar mode via BIP pin | BIP = high configures ±2.048V input range (centered at AGND); BIP = low sets 0–4.096V unipolar range - no external op-amp needed. |
| Three interface modes (parallel/serial/slow-memory) | Eliminates need for glue logic: 8-bit µP bus compatibility, SPI/QSPI framing via SSTRB, and ROM-mode read sequencing reduce firmware overhead. |
| Track/hold with 2µs acquisition time | Supports source impedances ≤2kΩ without external hold capacitor - simplifies front-end design for thermocouple or strain gauge interfaces. |
| 50µA power-down current | Reduces average system power by >98% during idle periods - extends operational life in solar-powered remote telemetry nodes. |
Applications
| Battery-Powered Data Logging | PC Pen Digitizers |
|---|---|
Use Scenario: Portable environmental sensor node recording temperature, humidity, and pressure at 100Hz intervals using coin-cell battery. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog outputs from MEMS sensors; internal reference ensures stable full-scale over temperature; PD pin enables microcontroller-governed sleep/wake cycles. Use Value: 50µA power-down current extends battery life to >2 years; 12-bit resolution captures sub-0.1°C thermal gradients without oversampling. |
Use Scenario: Resistive touch overlay on LCD display capturing stylus position with 0.02mm spatial resolution. IC Role / Device Role / Timing Role: Converts X/Y electrode voltages into 12-bit coordinates; pseudo-differential input rejects common-mode noise from display backlight switching. Use Value: 7.5µs conversion time enables >130 coordinate samples per second; bipolar mode directly measures negative/positive bridge imbalances. |
| High-Accuracy Process Control | Automatic Testing Systems |
Use Scenario: PLC analog input module measuring 4–20mA current loop signals from flow meters and pressure transmitters. IC Role / Device Role / Timing Role: Interfaces to precision op-amp I/V converter; internal reference eliminates external voltage reference IC; REFADJ trims system gain to ±0.1% tolerance. Use Value: ±1 LSB INL ensures <0.025% linearity error across 16-bit-equivalent dynamic range; dual ±5V supply supports isolated loop-powered sensors. |
Use Scenario: Production-line functional tester validating audio codec performance using swept sine and THD+N analysis. IC Role / Device Role / Timing Role: Captures analog test waveforms at 100ksps; serial interface streams data to FPGA for real-time FFT; BUSY pin synchronizes acquisition windows. Use Value: 80dB SFDR enables clean 12-bit spectral analysis of 1kHz signals; 50ps aperture jitter minimizes phase noise in frequency-domain measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7816U | 12-bit SAR, 200ksps, internal 2.5V ref, SPI-only interface, 8-pin SOIC | Lacks parallel interface and bipolar input support; higher speed but no REFADJ trim capability | Select when board space is constrained and only SPI connectivity is required; not drop-in due to pin count and missing HBEN/BIP pins. |
| AD7892BRZ | 12-bit SAR, 100ksps, internal 2.5V ref, parallel/serial interface, 24-pin SOIC | Same sample rate and interface flexibility, but uses 2.5V reference (not 4.096V) and lacks REFADJ pin for gain calibration | Choose for designs already using 2.5V reference architecture; requires external gain stage to match MAX191BCNG+ full-scale code mapping. |
Compared with ADS7816U and AD7892BRZ, the MAX191BCNG+ uniquely combines 4.096V factory-trimmed reference, REFADJ gain trim, bipolar/unipolar mode selection, and 24-pin DIP packaging - making it optimal for legacy industrial systems requiring field-calibratable precision without layout changes.
Availability
MAX191BCNG+ is available at Aetrix Electronics and suitable for battery-powered data logging, PC pen digitizers, and high-accuracy process control requiring stable component supply across extended temperature ranges (0°C to +70°C).
Supply support for MAX191BCNG+ 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 industrial, medical, and communications applications, with emphasis on low-power, high-integration solutions.
The MAX191BCNG+ belongs to Maxim's legacy precision data-acquisition family, engineered specifically for portable and embedded systems needing self-contained 12-bit conversion with minimal external components and field-adjustable calibration.
FAQ
What is the operating temperature range for the MAX191BCNG+?
The MAX191BCNG+ is specified for operation from 0°C to +70°C, matching the 'C' grade designation in Maxim's ordering nomenclature. This range covers commercial and industrial indoor environments, including PC-based data-acquisition boards and battery-powered handheld instruments where ambient temperatures remain within this window. The device maintains ±1 LSB integral nonlinearity and 100ksps sample rate across the full range.
Does the MAX191BCNG+ require external passive components for basic operation?
Yes - the MAX191BCNG+ requires only three external components for fundamental operation: a 4.7µF bulk capacitor and 0.1µF ceramic capacitor on VDD, and a 0.1µF capacitor from AIN− to AGND to stabilize the pseudo-differential return path. No external hold capacitor, reference buffer, or clock crystal is needed, as the device integrates track/hold, 4.096V reference, and internal oscillator.
How does the REFADJ pin function in the MAX191BCNG+?
The REFADJ pin on the MAX191BCNG+ accepts a DC voltage between 2.5V and 5.0V to adjust the internal reference output at VREF. A change of 1V on REFADJ typically alters VREF by ~1.7V, enabling precise system-level gain calibration to compensate for sensor sensitivity drift or PCB trace resistance. This eliminates the need for external DACs or trimming potentiometers in high-accuracy measurement systems.
Can the MAX191BCNG+ interface directly with a microcontroller using SPI protocol?
Yes - the MAX191BCNG+ supports SPI-compatible serial communication when PAR = low. In this mode, CS initiates conversion on its falling edge, SCLKOUT provides the serial clock, SSTRB acts as frame synchronization, and DOUT shifts out 12-bit data MSB-first. It is compatible with standard SPI modes (CPOL = 0, CPHA = 0) and requires no additional level-shifting for 5V-tolerant µCs.
What is the significance of the 'B' grade in MAX191BCNG+?
The 'B' in MAX191BCNG+ denotes the device's accuracy grade: ±1 LSB integral nonlinearity (INL) and ±1 LSB differential nonlinearity (DNL) over temperature, versus ±2 LSB for the 'A' grade. This tighter specification ensures guaranteed monotonicity and reduced end-point error in closed-loop control and metrology applications where absolute accuracy is critical - confirmed in the official Maxim datasheet revision 4.
MAX191BCNG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI, Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- ±5V, 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX191BCNG+ FAQ
1.How can I place an order for MAX191BCNG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX191BCNG+ 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 MAX191BCNG+ reliable?
The price and inventory of MAX191BCNG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX191BCNG+ is usually 5 days.
3.What payment methods are accepted for MAX191BCNG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX191BCNG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX191BCNG+?
MAX191BCNG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX191BCNG+ 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 MAX191BCNG+?
For technical support, including MAX191BCNG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX191BCNG+ requirements.
6.How does Aetrix verify that MAX191BCNG+ is sourced from the original manufacturer or authorized distributors?
All MAX191BCNG+ 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 MAX191BCNG+ meets industry standards.
7.What is the process for return or replacement of MAX191BCNG+?
All MAX191BCNG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX191BCNG+, 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 MAX191BCNG+ part is unused and in its original packaging.
Return procedure for MAX191BCNG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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