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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:1,031
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Product details
Overview
The MAX191BCNG from Maxim Integrated is a monolithic, CMOS 12-bit successive-approximation analog-to-digital converter (ADC) with differential pseudo-differential inputs, integrated track/hold, internal 4.096V voltage reference with REFADJ trim input, and dual serial/parallel µP interface. It delivers 100ksps guaranteed sampling 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 industrial process controllers.
For engineers reviewing the MAX191BCNG datasheet, MAX191BCNG pinout, MAX191BCNG application, or MAX191BCNG equivalent, this page provides verified technical context for low-power, high-accuracy 12-bit ADC selection in battery-powered and embedded measurement systems requiring internal reference stability, power-down mode (50µA), and SPI/Microwire-compatible serial interface.
Technical Context
The MAX191BCNG implements a SAR architecture with on-chip track/hold and internal bandgap reference buffered at VREF (4.096V ±20mV at +25°C). Its analog front-end supports pseudo-differential operation: AIN+ is actively sampled while AIN− serves as stable return reference, requiring ≤±0.5LSB drift during conversion.
Digital control includes three interface modes: slow-memory parallel (two 8-bit reads), ROM-mode parallel (three-read sequence), and serial mode compliant with SPI, QSPI, and Microwire standards using SCLKOUT, SSTRB, and DOUT. Clocking supports internal oscillator (120pF capacitor on CLK–DGND yields ~1MHz) or external TTL/CMOS clock (100kHz–1.6MHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes over temperature |
| Sampling Rate | Guaranteed 100ksps - enables real-time capture of signals up to 50kHz Nyquist bandwidth |
| Integral Nonlinearity | ±1 LSB max - ensures monotonicity and <0.025% full-scale linearity error |
| Reference Voltage | Internal 4.096V ±20mV (TYP) with REFADJ trim range ±0.1V - supports system gain calibration |
| Power-Down Current | 50µA max (including reference) - extends battery life in sleep intervals |
| Conversion Time | 7.5µs (13-clock cycle @ 1.6MHz) - defines minimum inter-sample interval |
| Aperture Jitter | 50ps RMS - limits SNR degradation to ≤0.3dB at 100kHz input |
Pinout & Package
MAX191BCNG is packaged in a 24-pin narrow plastic DIP (0.300" width) with through-hole mounting and standard JEDEC MO-091 footprint. Pin 1 is marked by notch or dot; pin numbering follows counterclockwise convention from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 24) | Positive supply input | +5V ±5% main power rail; powers analog core, digital logic, and internal reference |
| VSS (Pin 1) | Negative supply input | 0V or –5V ±5% rail enabling true bipolar input range (±2.048V with internal reference) |
| AGND (Pin 23) | Analog ground reference | Return path for AIN+, AIN−, VREF, REFADJ - must be isolated from DGND to minimize noise coupling |
| DGND (Pin 12) | Digital ground reference | Return path for all digital I/O pins (CS, RD, D0–D7, etc.) - connects to system digital ground plane |
| AIN+ (Pin 2) | Sampled analog input | Main signal input; accepts unipolar (0–VREF) or bipolar (±VREF/2) voltages depending on BIP state |
| AIN− (Pin 3) | Analog input return | Pseudo-differential reference node; must remain stable within ±0.5LSB relative to AGND during conversion |
| REFADJ (Pin 6) | Reference trim adjustment | Input for external resistor divider to calibrate VREF output; ±0.1V range adjusts gain error |
| VREF (Pin 7) | Reference buffer output | 4.096V buffered reference source; drives external circuitry or serves as ADC reference when REFADJ = VDD |
| BUSY (Pin 8) | Conversion status indicator | Active-low open-drain output signaling conversion in progress; used for handshaking or interrupt generation |
| CS (Pin 19) | Chip-select control | Enables digital interface; falling edge initiates conversion in serial mode; required low for parallel read access |
| RD (Pin 18) | Read strobe input | Triggers data output enable in parallel mode; controls SCLKOUT/SSTRB in serial mode when CS is low |
| HBEN (Pin 20) | High-byte enable | Selects upper 4 bits (D11–D8) on D0–D3 in parallel mode; controls SCLKOUT continuous vs. burst operation in serial mode |
| PAR (Pin 21) | Interface mode select | High = parallel mode; low = serial mode - configures pin functions (D7/DOUT, D6/SCLKOUT, D5/SSTRB) |
| PD (Pin 9) | Power-down control | Low = full shutdown (50µA); high = normal operation; floating = external reference compensation mode |
| BIP (Pin 5) | Bipolar/unipolar mode | High = bipolar (2's complement output); low = unipolar (straight binary) - sets MSB inversion behavior |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates need for external hold capacitor; 2µs acquisition time supports high-Z sensor interfaces |
| Internal 4.096V reference | Stable ±80ppm/°C tempco and ±20mV initial tolerance - reduces BOM count and layout complexity |
| Three configurable interface modes | Supports legacy 8-bit µP buses (slow-memory/ROM), plus SPI/QSPI/Microwire - simplifies firmware reuse |
| Logic-controlled power-down | 50µA shutdown current preserves battery life between measurements without external regulators |
| Pseudo-differential input architecture | Enables true bipolar signal acquisition with single-ended sensor wiring and minimal external components |
| Flexible clocking | Internal oscillator (capacitor-timed) or external clock (100kHz–1.6MHz) - adapts to system timing constraints |
Applications
| Battery-Powered Data Logging | PC Pen Digitizers |
|---|---|
Use Scenario: Portable environmental sensor nodes recording temperature, humidity, and pressure at 100Hz intervals over multi-day deployments. IC Role / Device Role / Timing Role: Primary 12-bit ADC acquiring conditioned analog sensor outputs with internal reference and power-down between samples. Use Value: 50µA power-down current extends coin-cell battery life beyond 1 year; 7.5µs conversion enables rapid wake-up and low-latency sampling. |
Use Scenario: Real-time coordinate capture in stylus-based tablet PCs where pen tip position is derived from analog tablet grid signals. IC Role / Device Role / Timing Role: High-speed digitizer converting X/Y electrode voltages with precise timing synchronization to avoid jitter-induced positional error. Use Value: 50ps aperture jitter and 100ksps rate ensure sub-millimeter spatial resolution; pseudo-differential input rejects common-mode noise from display interference. |
| High-Accuracy Process Control | Electromechanical Systems |
Use Scenario: Closed-loop feedback in PLC analog I/O modules measuring 4–20mA current loops and thermocouple outputs with <0.025% linearity. IC Role / Device Role / Timing Role: Precision ADC providing calibrated 12-bit digital representation of industrial sensor signals with gain/offset trim capability. Use Value: REFADJ pin allows field calibration of system gain errors; ±1 LSB INL guarantees monotonic response across full operating temperature range (0°C to +70°C). |
Use Scenario: Motor drive current sensing and position feedback in servo amplifiers where analog feedback signals require high SNR and low latency. IC Role / Device Role / Timing Role: Signal conditioning ADC capturing shunt voltage and encoder analog outputs with simultaneous sampling capability. Use Value: Dual ±5V supply support enables direct connection to bipolar op-amp stages; 70dB SINAD at 1kHz ensures clean current measurement under PWM switching noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7816U | Single-supply only (+5V), no internal reference, requires external 4.096V ref; 250ksps max sample rate | Lacks bipolar input support and power-down mode; better suited for high-speed single-supply systems | Choose ADS7816U when higher throughput is needed and external reference is already present |
| MAX1113EPA+ | 12-bit, 100ksps, internal reference, but only unipolar input; 8-pin SO package; no serial interface | Smaller footprint and lower cost, but lacks bipolar mode, HBEN, and serial compatibility | Choose MAX1113EPA+ for space-constrained unipolar-only applications with simple parallel readout |
Compared with ADS7816U and MAX1113EPA+, the MAX191BCNG uniquely combines internal 4.096V reference, bipolar/unipolar mode via BIP pin, SPI/Microwire serial interface, and 50µA power-down - making it optimal for portable, dual-supply, and calibration-flexible measurement designs.
Availability
MAX191BCNG is available at Aetrix Electronics and suitable for battery-powered data logging, PC pen digitizers, and high-accuracy process control applications requiring stable component supply, long-lifecycle availability, and traceable sourcing.
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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX191BCNG belongs to Maxim's precision data-acquisition ADC product line, designed specifically for low-power, high-accuracy measurement systems requiring integrated reference, flexible interface, and robust performance across temperature.
FAQ
What is the operating temperature range for the MAX191BCNG?
The MAX191BCNG is specified for operation from 0°C to +70°C, as indicated by the 'C' grade suffix in its part number. This commercial-grade temperature range is validated across all electrical parameters including offset error (±2 LSB), integral nonlinearity (±1 LSB), and reference voltage stability (±20mV at +25°C).
Does the MAX191BCNG support true differential input operation?
No, the MAX191BCNG uses a pseudo-differential input architecture: only AIN+ is actively sampled by the internal track/hold, while AIN− serves as a stable reference return. For accurate bipolar conversion, AIN− must remain within ±0.5LSB of AGND during conversion - typically achieved with a 0.1µF capacitor to AGND.
How does the REFADJ pin function in the MAX191BCNG?
The REFADJ pin on the MAX191BCNG provides a trim input for the internal 4.096V reference. Applying a voltage between 2.4V and 5.0V adjusts VREF output proportionally (≈1.7× gain), enabling system-level gain calibration to correct for sensor or amplifier errors - a key feature confirmed in the device's Electrical Characteristics table.
Can the MAX191BCNG operate with an external reference?
Yes, the MAX191BCNG supports external reference operation. When REFADJ is tied to VDD, the VREF pin becomes an input accepting an external 4.096V reference; the internal reference is disabled. This mode is explicitly documented in the Ordering Information table and Functional Diagram, and maintains full 12-bit accuracy.
What package type is used for the MAX191BCNG?
The MAX191BCNG is supplied in a 24-pin narrow plastic DIP (Dual In-line Package) with 0.300" body width, as confirmed in the Ordering Information table. This through-hole package is distinct from the wide SO variant (e.g., MAX191BCWG) and supports breadboard prototyping and legacy PCB assembly.
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:
- Obsolete
- 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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