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Analog Devices Inc./Maxim Integrated MAX191BEWG
- Part No.:
- MAX191BEWG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX191BEWG.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,811
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Product details
Overview
The MAX191BEWG 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 selectable parallel or SPI/QSPI/MICROWIRE serial interface. It delivers 100ksps guaranteed sample rate, 7.5µs conversion time, and operates from single +5V or dual ±5V supplies. It is used in high-accuracy process control systems requiring low-power, ground-referenced bipolar signal digitization.
For engineers reviewing the MAX191BEWG datasheet, MAX191BEWG pinout, MAX191BEWG application, or MAX191BEWG equivalent, this page provides verified technical context, package mapping to 24-pin wide SO, confirmed timing parameters (tCONV = 7.5µs, tACQ = 2µs), interface mode behavior (PAR/HBEN logic), and validated alternative options for 12-bit SAR ADC replacement in embedded data-acquisition designs.
Technical Context
The MAX191BEWG implements a 12-bit successive-approximation register (SAR) architecture with on-chip track/hold that acquires input signals in ≤2µs and completes conversion in 7.5µs using either internal oscillator (120pF CLK–DGND) or external clock up to 1.6MHz. Its pseudo-differential input structure requires AIN− stability within ±0.5LSB relative to AGND during conversion, enforced by internal capacitor switching and external 0.1µF decoupling.
Interface flexibility is achieved via PAR pin selection: parallel mode uses HBEN-controlled 8-bit bus multiplexing (D7–D0 for LSBs, D0–D3 for MSBs), while serial mode supports SPI-compatible framing with SCLKOUT, SSTRB, and DOUT outputs synchronized to CS falling edge. Power-down mode reduces VDD current from 3mA to 50µA while retaining bandgap reference functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB = 1 part in 4096 full-scale quantization steps |
| Sample Rate | 100ksps guaranteed - supports real-time acquisition of signals up to 50kHz Nyquist bandwidth |
| Conversion Time | 7.5µs - defines minimum inter-conversion interval in continuous sampling applications |
| Track/Hold Acquisition | 2µs - sets minimum settling time required after input source impedance and hold capacitance (32pF) |
| Reference Voltage | 4.096V internal - enables precise 1mV/LSB scaling with ±1/2 LSB gain error over −40°C to +85°C |
| Supply Range | +5V single or ±5V dual - allows direct digitization of bipolar inputs referenced to system ground |
| Power-Down Current | 50µA max - reduces system standby power without losing reference stability or requiring re-trimming |
Pinout & Package
MAX191BEWG is housed in a 24-pin wide SO (SOIC-W) package, 7.6mm body width, 1.27mm pitch, RoHS-compliant, with exposed pad not electrically connected. Pin numbering follows standard SOIC convention (pin 1 at notch end, counterclockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (24) | Positive supply input | Accepts +5V ±5%; powers analog core, reference, and digital logic |
| VSS (1) | Negative supply input | Accepts 0V or −5V ±5%; enables true bipolar input range when grounded or negative |
| AGND (23) | Analog ground reference | Return for AIN+, AIN−, VREF, REFADJ; must be separated from DGND for optimal SNR |
| DGND (12) | Digital ground reference | Return for all logic I/O; connected to system digital ground plane |
| AIN+ (2) | Primary analog input | Sampled node for unipolar or pseudo-differential signals; protected to VSS −0.3V / VDD +0.3V |
| AIN− (3) | Analog input return | Stable reference point for pseudo-differential operation; requires 0.1µF to AGND |
| VREF (4) | Reference buffer output | 4.096V internal reference source; can serve as external reference input when REFADJ = VDD |
| REFADJ (5) | Reference gain trim input | Adjusts VREF output by ±1.7× applied voltage deviation from 2.4V nominal |
| BIP (6) | Bipolar/unipolar mode select | High = bipolar (2's complement), low = unipolar (straight binary) output format |
| CLK/SCLK (22) | Internal oscillator or serial clock input | 120pF to DGND yields ~1MHz internal clock; accepts 100kHz–1.6MHz external TTL/CMOS clock |
| PAR (21) | Interface mode select | High = parallel mode, low = serial mode; determines function of D7–D0 pins |
| HBEN (20) | High-byte enable / serial clock control | In parallel mode: selects MSB/LSB byte; in serial mode: controls SCLKOUT duty cycle |
| CS (19) | Chip-select input | Falling edge initiates conversion in serial mode; enables RD/HBEN decoding in parallel mode |
| RD (18) | Read strobe input | Starts conversion in slow-memory mode; enables output drivers and SCLKOUT/SSTRB in serial mode |
| BUSY (17) | Conversion status output | Active-low open-drain signal indicating conversion in progress; asserts for exactly 13 clock cycles |
| D7/DOUT (13) | Data output / serial data out | Three-state parallel LSB byte or serial MSB-first data stream; high-impedance when CS = high |
| D6/SCLKOUT (14) | Clock output / serial clock out | Provides synchronous serial clock derived from internal oscillator or external CLK; enabled by RD/CS |
| D5/SSTRB (15) | Strobe output / serial frame sync | Active-low pulse marking start of valid serial data frame; compatible with MICROWIRE framing |
| PD (9) | Power-down control | Low = power-down (50µA), high = normal operation, floating = external reference compensation mode |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates need for external hold capacitor; achieves 2µs acquisition with 32pF internal hold capacitance |
| Trim-adjustable internal reference | REFADJ pin enables system-level gain calibration to compensate for sensor/PCB gain drift |
| Dual-supply flexible operation | ±5V support enables direct digitization of ±5V industrial sensor outputs without level-shifting circuitry |
| Three interface modes | Parallel (two 8-bit reads), SPI, QSPI, and MICROWIRE compatibility reduce µP firmware complexity |
| Low-power active and standby states | 3mA operating current and 50µA power-down current extend battery life in portable data loggers |
| Pseudo-differential input architecture | Reduces common-mode noise sensitivity while maintaining single-ended signal routing simplicity |
Applications
| Battery-Powered Data Logging | High-Accuracy Process Control |
|---|---|
Use Scenario: Portable environmental monitoring units logging temperature, pressure, and humidity over multi-day periods using coin-cell batteries. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned sensor outputs; internal reference ensures stable LSB scaling across temperature and battery discharge. Use Value: 50µA power-down current extends operational life beyond 6 months; 12-bit resolution captures sub-0.1% sensor nonlinearity. |
Use Scenario: PLC analog input modules acquiring 4–20mA current-loop signals from flow meters and pressure transmitters in chemical plants. IC Role / Device Role / Timing Role: Precision front-end ADC with ±5V dual-supply operation directly interfacing industrial transducers without signal conditioning. Use Value: ±1/2 LSB integral nonlinearity and 80dB SFDR ensure compliance with IEC 61000-4-3 immunity requirements for measurement accuracy. |
| PC Pen Digitizers | Electromechanical Systems |
Use Scenario: Active stylus digitizer tablets capturing pen position and pressure with sub-millisecond latency for CAD and annotation applications. IC Role / Device Role / Timing Role: High-speed sampling ADC converting analog pen-tip voltage into 12-bit coordinate data synchronized to host USB polling. Use Value: 7.5µs conversion time enables >100ksps sampling, supporting 200+ points/sec tracking with <50µs end-to-end latency. |
Use Scenario: Servo motor control boards measuring back-EMF, current sense, and encoder feedback in robotics and CNC motion systems. IC Role / Device Role / Timing Role: Multi-channel ADC subsystem digitizing isolated current shunt voltages and resolver sine/cosine signals with synchronized sampling. Use Value: Differential input structure rejects common-mode noise from PWM-driven power stages; 50ps aperture jitter preserves phase accuracy in closed-loop control. |
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 | 12-bit, 200ksps, single +5V only, no internal reference, SPI-only interface | Lacks bipolar input support and internal reference; requires external 4.096V ref and level-shifting for ±5V signals | Choose when higher speed and lower cost are prioritized over dual-supply flexibility and reference integration |
| AD7892BRZ | 12-bit, 100ksps, ±5V supply, internal reference, parallel/serial interface, 28-lead SOIC | 28-pin SOIC vs. 24-pin SOIC; different pinout and timing; higher 12mA supply current | Choose when ADI ecosystem compatibility or extended temperature screening is required, accepting larger footprint and higher power |
Compared with ADS7816U and AD7892BRZ, the MAX191BEWG uniquely combines internal 4.096V reference, ±5V dual-supply operation, pseudo-differential input, and 24-pin SO packaging-making it optimal for space-constrained, battery-powered, or industrial bipolar-signal acquisition where reference stability and layout simplicity are critical.
Availability
MAX191BEWG is available at Aetrix Electronics and suitable for high-accuracy process control, battery-powered data logging, and electromechanical systems requiring stable component supply across extended temperature ranges (−40°C to +85°C) and long production lifecycles.
Supply support for MAX191BEWG 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 MAX191 product line was designed for low-power, high-accuracy data acquisition in resource-constrained embedded systems-emphasizing integrated references, flexible interfaces, and robust operation across industrial temperature ranges.
FAQ
What is the operating temperature range for the MAX191BEWG?
The MAX191BEWG is rated for −40°C to +85°C ambient operation, matching the 'E' grade designation in Maxim's ordering nomenclature. This range is fully characterized for all DC accuracy parameters including offset error (±1 LSB), gain error (±3 LSB), and integral nonlinearity (±1 LSB), ensuring reliable performance in industrial control cabinets and outdoor data loggers without derating.
Does the MAX191BEWG require external components for basic operation?
Yes - the MAX191BEWG requires only three external components for minimal functional operation: a 0.1µF capacitor from AIN− to AGND for pseudo-differential stability, a 4.7µF capacitor on VREF for internal reference decoupling, and a 120pF capacitor from CLK to DGND if using the internal oscillator. No external hold capacitor, reference IC, or clock generator is needed.
How does the REFADJ pin affect the internal reference voltage?
The REFADJ pin adjusts the MAX191BEWG's internal 4.096V reference output (VREF) by ±1.7× the voltage deviation applied relative to its nominal 2.4V level. For example, applying 2.6V to REFADJ increases VREF by ~0.34V (0.2V × 1.7), enabling system-level gain calibration to correct for sensor or signal-chain errors without external DACs or op-amps.
Can the MAX191BEWG interface directly with a 3.3V microcontroller?
Yes - the MAX191BEWG's digital I/O pins (CS, RD, HBEN, PAR, BUSY, D0–D7) are TTL/CMOS-compatible with VIH = 2.4V and VIL = 0.8V, allowing direct connection to 3.3V µPs without level shifters. However, VDD must remain at +5V to maintain specified analog performance and internal reference accuracy; the digital interface operates independently of analog supply levels.
What is the significance of the 'BEWG' suffix in MAX191BEWG?
The 'BEWG' suffix identifies the MAX191BEWG as the −40°C to +85°C temperature grade ('E'), 1 LSB integral nonlinearity grade ('B'), and 24-pin wide SOIC package ('WG'). This distinguishes it from variants like MAX191ACNG (0°C to +70°C, 'A' grade, narrow DIP) and confirms its suitability for industrial environments where extended temperature operation and tighter INL are required.
MAX191BEWG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX191BEWG FAQ
1.How can I place an order for MAX191BEWG through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX191BEWG 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 MAX191BEWG reliable?
The price and inventory of MAX191BEWG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX191BEWG is usually 5 days.
3.What payment methods are accepted for MAX191BEWG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX191BEWG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX191BEWG?
MAX191BEWG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX191BEWG 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 MAX191BEWG?
For technical support, including MAX191BEWG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX191BEWG requirements.
6.How does Aetrix verify that MAX191BEWG is sourced from the original manufacturer or authorized distributors?
All MAX191BEWG 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 MAX191BEWG meets industry standards.
7.What is the process for return or replacement of MAX191BEWG?
All MAX191BEWG units undergo pre-shipment inspection (PSI). If there is an issue with MAX191BEWG, 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 MAX191BEWG part is unused and in its original packaging.
Return procedure for MAX191BEWG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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