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Analog Devices Inc./Maxim Integrated MAX191BCWG-T
- Part No.:
- MAX191BCWG-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX191BCWG-T.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,925
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Product details
Overview
MAX191BCWG-T 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 PC digitizers.
For engineers reviewing the MAX191BCWG-T datasheet, MAX191BCWG-T pinout, MAX191BCWG-T application, or MAX191BCWG-T equivalent, this page provides verified electrical specifications, validated SO-24 wide-body package mapping, confirmed SPI/MICROWIRE/QSPI serial compatibility, and real-world timing constraints for synchronous µP interfacing in battery-powered and industrial DAQ systems.
Technical Context
The MAX191BCWG-T 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 ≤±0.1LSB stability during conversion.
Digital control logic enables three distinct interface modes: slow-memory parallel (two 8-bit reads), ROM-mode parallel (three-read sequence), and serial mode with SCLKOUT, SSTRB, and DOUT synchronized to CS falling edge. Clocking supports either external 100kHz–1.6MHz TTL/CMOS source or internal oscillator using 120pF CLK-to-DGND capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB = 1 part in 4096 full-scale quantization step |
| Sampling Rate | 100ksps guaranteed - supports real-time capture of signals up to 50kHz Nyquist bandwidth |
| Conversion Time | 7.5µs - fixed latency from BUSY low to BUSY high, independent of input signal |
| Integral Nonlinearity | ±1 LSB (MAX191B grade) - ensures monotonic transfer function across full temperature range |
| Reference Voltage | 4.096V internal (±20mV at +25°C) - enables precise 12-bit scaling without external reference component |
| Power-Down Current | 50µA max - reduces system standby power in battery-operated data loggers |
| Supply Range | +5V single supply or ±5V dual supply - allows direct interface to bipolar transducer outputs |
Pinout & Package
MAX191BCWG-T is housed in a 24-pin wide SO (SOIC-W) surface-mount package, 7.6mm body width, 1.27mm pitch, RoHS-compliant. Pin 1 marked by beveled corner or dot; pin count verified per Maxim's official ordering information and pin configuration diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 24) | Positive supply input | Accepts +5V ±5%; powers analog core, reference, and digital logic |
| VSS (Pin 1) | Negative supply input | Accepts 0V or −5V ±5%; enables true bipolar input range when used |
| AGND (Pin 23) | Analog ground reference | Return for AIN+, AIN−, VREF, REFADJ; must be isolated from DGND for optimal SNR |
| DGND (Pin 12) | Digital ground reference | Return for all digital I/O pins; connected to system digital ground plane |
| AIN+ (Pin 2) | Primary analog input | Sampled node for pseudo-differential operation; accepts 0V to VREF (unipolar) or ±VREF/2 (bipolar) |
| AIN− (Pin 3) | Analog input return | Stable reference point during conversion; requires 0.1µF bypass to AGND for ±0.1LSB stability |
| VREF (Pin 4) | Reference buffer output | 4.096V internal reference output; can serve as external reference input when REFADJ = VDD |
| REFADJ (Pin 5) | Reference trim input | Adjusts gain error via 2.5V–5.0V input; enables system-level calibration of full-scale error |
| CLK/SCLK (Pin 22) | Clock input / serial clock input | Accepts external 100kHz–1.6MHz clock or drives internal oscillator with 120pF capacitor to DGND |
| CS (Pin 19) | Chip-select input | Falling edge initiates conversion in serial mode; enables RD/HBEN decoding in parallel mode |
| RD (Pin 18) | Read strobe input | Triggers conversion start (with CS/HBEN low) and enables data bus output in parallel mode |
| BUSY (Pin 17) | Conversion status output | Active-low open-drain signal; low during conversion, high when result ready on data bus |
| HBEN (Pin 20) | High-byte enable input | Selects MSB (D11–D8) vs. LSB (D7–D0) output in parallel mode; controls SCLKOUT behavior in serial mode |
| PAR (Pin 21) | Interface mode select | High = parallel mode; low = serial mode (SPI/MICROWIRE/QSPI compatible) |
| PD (Pin 8) | Power-down control | Low = 50µA standby mode (bandgap only active); high = normal operation; floating = external-reference mode |
| D0/D8–D7/DOUT (Pins 9–16) | Three-state data I/O | Parallel data bus (D7–D0) or serial data output (DOUT); direction and state controlled by PAR/HBEN/RD/CS |
| BIP (Pin 6) | Bipolar/unipolar mode select | High = bipolar (−VREF/2 to +VREF/2); low = unipolar (0V to VREF); sets MSB inversion in output format |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates need for external hold capacitor; 2µs acquisition time enables fast settling from high-Z sources |
| Internal 4.096V reference | Reduces BOM count and layout area; ±80ppm/°C tempco supports stable 12-bit accuracy over 0°C to +70°C |
| REFADJ trim input | Enables system-level gain calibration by adjusting VREF output over ±1.7× nominal change per volt applied |
| Serial interface compatibility | Native support for SPI, QSPI, and MICROWIRE protocols - no glue logic required for microcontroller integration |
| Logic power-down mode | 50µA max current draw preserves battery life in intermittent-sampling applications like environmental sensors |
| Pseudo-differential input | Supports true bipolar signal acquisition without dedicated instrumentation amplifier; AIN− stability requirement met with 0.1µF AGND bypass |
Applications
| Battery-Powered Data Logging | PC Pen Digitizers |
|---|---|
Use Scenario: Portable environmental sensor nodes logging temperature, humidity, and pressure at 100Hz intervals using coin-cell batteries. IC Role / Device Role / Timing Role: ADC front-end acquiring conditioned analog sensor outputs with minimal external components and ultra-low standby current. Use Value: 50µA power-down current extends battery life to >2 years; internal reference eliminates calibration drift over temperature. |
Use Scenario: Real-time coordinate capture from resistive touch overlays on tablet PCs, requiring sub-millisecond latency and noise immunity. IC Role / Device Role / Timing Role: High-speed sampling ADC converting stylus position voltage into 12-bit digital coordinates synchronized to host µP bus. Use Value: 7.5µs conversion time and BUSY-driven handshaking enable deterministic µP read timing; pseudo-differential input rejects common-mode noise from display drivers. |
| High-Accuracy Process Control | Automatic Testing Systems |
Use Scenario: Closed-loop industrial controller monitoring thermocouple and RTD signals with <±0.1% full-scale accuracy across 0°C to +70°C ambient. IC Role / Device Role / Timing Role: Precision measurement ADC providing calibrated 12-bit resolution with gain/offset trimming via REFADJ and BIP pins. Use Value: ±1 LSB INL and ±1 LSB offset error guarantee monotonicity and linearity; internal reference tempco (80ppm/°C) meets Class A sensor requirements. |
Use Scenario: Production-line functional tester validating analog sensor modules using programmable stimulus and precision response capture. IC Role / Device Role / Timing Role: Reconfigurable ADC supporting both unipolar (0–5V) and bipolar (±2.5V) test signal ranges via BIP pin control. Use Value: Dual ±5V supply operation enables direct connection to op-amp test fixtures; serial interface simplifies FPGA-based test controller design. |
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 supply only; no internal reference; requires external 4.096V ref | Lacks internal reference and bipolar support; better suited for high-speed unipolar-only systems | Choose when higher sample rate is critical and external reference is already present in BOM |
| AD7892BRZ-1 | 12-bit, 100ksps, ±5V supply capable; internal reference (2.5V); no REFADJ trim; serial-only interface | No parallel interface or REFADJ; lower reference voltage limits dynamic range for 5V systems | Prefer when board space is constrained and only SPI interface is needed; verify 2.5V ref compatibility with system full-scale |
Compared with ADS7816U and AD7892BRZ-1, the MAX191BCWG-T uniquely combines internal 4.096V reference with REFADJ trim, dual ±5V operation, and selectable parallel/serial interfaces - making it optimal for cost-sensitive, battery-aware, and field-calibratable DAQ designs where flexibility and component count matter.
Availability
MAX191BCWG-T is available at Aetrix Electronics and suitable for battery-powered data loggers, PC pen digitizers, and high-accuracy process control systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX191BCWG-T 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX191BCWG-T belongs to Maxim's precision data-acquisition product line, designed specifically for portable and embedded systems needing low-power, high-accuracy 12-bit conversion with minimal external components and flexible µP interfacing.
FAQ
What is the operating temperature range for the MAX191BCWG-T?
The MAX191BCWG-T is rated for 0°C to +70°C ambient operation, as confirmed by Maxim's official ordering information table where "BC" suffix denotes commercial temperature grade and "WG" specifies wide SO package. This range is validated across all DC and AC parameters including INL, offset error, and reference stability.
Does the MAX191BCWG-T require external decoupling capacitors?
Yes - the MAX191BCWG-T requires a 4.7µF capacitor on VREF (Pin 4) and 0.1µF capacitors on AIN− (Pin 3) to AGND and VDD (Pin 24) to DGND, as specified in the Functional Diagram and Typical Operating Circuit (Figure 3). These are mandatory for stable reference operation and analog input integrity.
Can the MAX191BCWG-T operate with only a +5V supply?
Yes - the MAX191BCWG-T supports single +5V supply operation (VDD = +5V, VSS = 0V), enabling unipolar input ranges from 0V to VREF. In this configuration, the internal reference remains fully functional, and power-down current drops to 50µA max, making it ideal for battery-powered applications.
How is the internal reference voltage trimmed on the MAX191BCWG-T?
The MAX191BCWG-T uses the REFADJ pin (Pin 5) to adjust VREF output. Applying 2.5V–5.0V to REFADJ changes VREF by up to ±1.7× the input voltage deviation from its nominal 2.4V level, allowing system-level gain calibration to correct for sensor or amplifier errors - a capability confirmed in Note 10 of the datasheet.
Is the MAX191BCWG-T pin-compatible with other MAX191 variants?
Yes - all MAX191 variants (including MAX191ACNG, MAX191BCWG-T, MAX191AEWG) share identical 24-pin SO and DIP footprints and pin functions. The "BC" grade guarantees ±1 LSB INL and ±2 LSB offset error over 0°C to +70°C, while package code "WG" confirms wide SO mechanical compatibility.
MAX191BCWG-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX191BCWG-T FAQ
1.How can I place an order for MAX191BCWG-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX191BCWG-T 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 MAX191BCWG-T reliable?
The price and inventory of MAX191BCWG-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX191BCWG-T is usually 5 days.
3.What payment methods are accepted for MAX191BCWG-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX191BCWG-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX191BCWG-T?
MAX191BCWG-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX191BCWG-T 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 MAX191BCWG-T?
For technical support, including MAX191BCWG-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX191BCWG-T requirements.
6.How does Aetrix verify that MAX191BCWG-T is sourced from the original manufacturer or authorized distributors?
All MAX191BCWG-T 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 MAX191BCWG-T meets industry standards.
7.What is the process for return or replacement of MAX191BCWG-T?
All MAX191BCWG-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX191BCWG-T, 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 MAX191BCWG-T part is unused and in its original packaging.
Return procedure for MAX191BCWG-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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