My Inquiry
My Account
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:2,051
Please send an inquiry. Send us your inquiry, and we will respond immediately.
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 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 industrial process controllers.
For engineers reviewing the MAX191BEWG+ datasheet, MAX191BEWG+ pinout, MAX191BEWG+ application, or MAX191BEWG+ equivalent, this page provides verified electrical specifications, package-confirmed pin functions, real-world interface timing constraints, and validated alternative parts for low-power, high-accuracy 12-bit sampling systems requiring internal reference and power-down capability.
Technical Context
The MAX191BEWG+ implements a SAR architecture with on-chip track/hold and internal bandgap reference buffered to 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 stability during conversion.
Digital control includes three configurable interface modes: slow-memory parallel (two 8-bit reads), ROM-mode parallel (three-read sequence), and SPI/QSPI/MICROWIRE-compatible serial mode using SCLK, SSTRB, and SCLKOUT. Power-down is asserted via PD pin, reducing supply current 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 quantization steps |
| Sampling Rate | 100ksps guaranteed - supports real-time acquisition of signals up to 50kHz Nyquist bandwidth |
| Conversion Time | 7.5µs - fixed latency from BUSY low to BUSY high, independent of input signal slew |
| Integral Nonlinearity | ±1 LSB (MAX191B grade) - ensures monotonicity and <0.024% end-point error across full range |
| Reference Voltage | 4.096V ±20mV at +25°C - matches standard 12-bit full-scale codes (0–4095) with 1mV/LSB scaling |
| Power-Down Current | 50µA max - enables battery life extension in intermittent-sampling applications like sensor nodes |
| Supply Range | +5V ±5% or ±5V ±5% - allows direct interfacing to bipolar transducer outputs without level-shifting |
Pinout & Package
MAX191BEWG+ is housed in a 24-pin wide SO (SOIC-W) package, 7.5mm body width, 1.27mm pitch, RoHS-compliant. Pin numbering follows standard SOIC convention with Pin 1 marked by notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Accepts +5V ±5%; powers analog core, reference, and digital logic |
| VSS | Negative supply input | Accepts 0V or –5V ±5%; enables true bipolar input range (±VREF) |
| AGND | Analog ground reference | Return for AIN+, AIN−, VREF, REFADJ; must be isolated from DGND for optimal SNR |
| DGND | Digital ground reference | Return for all logic I/O; connected to system digital ground plane |
| AIN+ | Sampled analog input | Active input node for track/hold; accepts 0V to VREF (unipolar) or ±VREF/2 (bipolar) |
| AIN− | Analog input return | Pseudo-differential reference; must remain stable within ±0.5LSB relative to AGND during conversion |
| VREF | Reference buffer output | 4.096V output when REFADJ = 2.4V; adjustable ±10% via REFADJ pin |
| REFADJ | Reference gain trim input | Adjusts VREF by 1.7× applied voltage deviation from 2.4V; enables system-level gain calibration |
| CLK/SCLK | Internal oscillator capacitor or external clock input | Connect 120pF to DGND for ~1MHz internal clock; accepts 100kHz–1.6MHz TTL/CMOS external clock |
| CS | Chip-select control | Falling edge initiates conversion in serial mode; enables RD/HBEN decoding in parallel mode |
| RD | Read strobe | Triggers data output enable in parallel mode; enables SCLKOUT/SSTRB in serial mode when CS low |
| HBEN | High-byte enable | Selects MSB (D11–D8) vs LSB (D7–D0) output in parallel mode; controls SCLKOUT duty in serial mode |
| BUSY | Conversion status flag | Active-low open-drain output; low during conversion, high when result is latched and ready |
| PAR | Interface mode select | High = parallel mode; low = serial mode; sets D7/DOUT, D6/SCLKOUT, D5/SSTRB function mapping |
| PD | Power-down control | Low = 50µA standby (reference active); high = 3mA normal operation; floating = external-reference compensation |
| BIP | Bipolar/unipolar mode select | High = bipolar (2's complement output); low = unipolar (straight binary output) |
| D0/D8–D7/DOUT | Configurable data bus | Parallel: D7–D0 = LSB byte (HBEN low) or MSB nibble (HBEN high); Serial: D7/DOUT = data out, others become SCLKOUT/SSTRB |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates need for external hold capacitor; 2µs acquisition time supports ≤100kHz input bandwidth |
| Internal 4.096V reference with trim | REFADJ pin enables system-level gain calibration to compensate for sensor/PCB gain drift |
| Three µP interface modes | Supports legacy 8-bit microcontrollers (slow-memory), memory-mapped systems (ROM mode), and modern SPI/QSPI hosts |
| True bipolar input support | ±5V dual-supply operation enables direct digitization of ±2.048V signals without external op-amp level-shifting |
| 50µA power-down state | Preserves internal reference accuracy while cutting quiescent current >98%, critical for battery-powered logging |
Applications
| Battery-Powered Data Logging | Industrial Process Control |
|---|---|
Use Scenario: Continuous voltage/current monitoring of remote sensors powered by Li-ion batteries with multi-day autonomy. IC Role / Device Role / Timing Role: Primary ADC acquiring analog sensor outputs at 10–100ksps; manages its own track/hold, reference, and µP interface timing. Use Value: 50µA power-down current extends battery life; internal reference eliminates need for precision external voltage source. |
Use Scenario: High-accuracy feedback loop in PLC analog I/O modules measuring temperature, pressure, and flow transducers. IC Role / Device Role / Timing Role: Precision digitizer for 4–20mA loop receivers and RTD/thermocouple signal conditioning circuits. Use Value: ±1 LSB INL and 70dB SINAD ensure <0.025% measurement uncertainty; bipolar input handles negative error margins. |
| PC-Based Data Acquisition | Automatic Test Equipment |
Use Scenario: ISA/PCI add-in cards for laboratory-grade waveform capture and spectral analysis in Windows/Linux environments. IC Role / Device Role / Timing Role: Core sampling engine synchronized to host bus timing; interfaces via parallel port or FPGA-controlled serial link. Use Value: 100ksps sustained rate and 80dB SFDR support clean FFT analysis of 1kHz–50kHz signals without aliasing. |
Use Scenario: Modular test instruments performing parametric measurements on semiconductor devices and passive components. IC Role / Device Role / Timing Role: Calibration-grade ADC in source-measure units (SMUs), providing traceable voltage/current digitization. Use Value: Internal reference tempco of 80ppm/°C and ±1/2 LSB offset error enable one-time factory calibration over –40°C to +85°C. |
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 | Single-supply only (+5V), no internal reference, 200ksps, 16-pin SOIC | Requires external reference and level-shifting for bipolar inputs; higher speed but less integration | Choose when higher throughput is needed and board space permits external reference design |
| AD7892BRZ | 12-bit, 250ksps, internal reference, ±5V supply, 24-pin SOIC, but no serial interface | Lacks SPI/QSPI compatibility; parallel-only interface limits µP flexibility | Prefer when maximum sample rate is critical and serial communication is unnecessary |
Compared with ADS7816U and AD7892BRZ, the MAX191BEWG+ uniquely combines internal 4.096V reference, dual ±5V supply support, and SPI/QSPI/parallel interface flexibility in a single 24-pin SOIC - making it optimal for space-constrained, battery-aware, and mixed-interface embedded systems.
Availability
MAX191BEWG+ is available at Aetrix Electronics and suitable for battery-powered data loggers, industrial process controllers, and PC-based data-acquisition boards requiring stable component supply across extended temperature ranges.
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) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX191BEWG+ belongs to Maxim's legacy high-accuracy data-conversion product line, engineered specifically for low-power, wide-temperature, and system-integrated 12-bit ADC applications where internal reference and flexible µP interfacing reduce bill-of-materials cost.
FAQ
What is the operating temperature range of the MAX191BEWG+?
The MAX191BEWG+ is rated for –40°C to +85°C, matching the 'E' grade designation in Maxim's ordering nomenclature. This extended industrial temperature range ensures reliable operation in harsh environments such as factory automation cabinets and outdoor sensor enclosures, where ambient temperatures exceed commercial-grade limits.
Does the MAX191BEWG+ require external decoupling capacitors?
Yes - the MAX191BEWG+ requires a 4.7µF capacitor on VREF (to DGND) and 0.1µF capacitors on VDD, VSS, and AGND (each to DGND), as specified in Figure 3 of the datasheet. These are mandatory for stable internal reference operation and noise-free analog performance; omission causes reference drift and increased INL error.
Can the MAX191BEWG+ interface directly with an SPI host controller?
Yes - the MAX191BEWG+ supports SPI, QSPI, and MICROWIRE protocols in serial mode. When PAR = low, CS falling edge starts conversion, and data appears on D7/DOUT synchronized to SCLKOUT (or external SCLK), with SSTRB framing each 12-bit word - fully compatible with standard SPI master timing requirements.
What is the purpose of the REFADJ pin on the MAX191BEWG+?
The REFADJ pin on the MAX191BEWG+ adjusts the internal reference voltage (VREF) by ±10% around its nominal 4.096V value. Applying a voltage deviation from 2.4V to REFADJ changes VREF by 1.7× that deviation, enabling precise system-level gain calibration to correct for sensor nonlinearity or PCB trace resistance errors.
How does the power-down mode affect the internal reference in the MAX191BEWG+?
In power-down mode (PD = low), the MAX191BEWG+ disables its analog core and digital logic but maintains the internal bandgap reference active - sustaining VREF at 4.096V with full accuracy and tempco. This allows fast wake-up (<1µs) while preserving reference stability for adjacent circuitry or multi-channel synchronization.
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:
- 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:
- -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.
MAX191BEWG+ Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
