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Analog Devices Inc./Maxim Integrated MAX191BCWG
- Part No.:
- MAX191BCWG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX191BCWG.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,149
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Product details
Overview
MAX191BCWG from Maxim Integrated is a 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 PC digitizers.
For engineers reviewing the MAX191BCWG datasheet, MAX191BCWG pinout, MAX191BCWG application, or MAX191BCWG equivalent, this page provides verified electrical specs, package mapping to 24-pin wide SO, functional pin roles, real-world use cases in battery-powered instrumentation, and two validated alternative ADCs for precision sampling systems requiring low power and internal reference support.
Technical Context
The MAX191BCWG implements a SAR architecture with on-chip track/hold that acquires signals in ≤2µs and exhibits 50ps aperture jitter. Its analog front-end supports unipolar (0–VREF) or bipolar (±VREF/2) input ranges via BIP pin control, with AIN+ and AIN− referenced to AGND and stable within ±0.5LSB during conversion.
Digital interface flexibility includes three modes: slow-memory parallel (two 8-bit reads), ROM-mode parallel (three-read sequence), and SPI/MICROWIRE/QSPI-compatible serial mode using CS, SCLK, SSTRB, and DOUT-each with defined timing constraints (e.g., tCONV = 7.5µs at 1.6MHz CLK, t13 = 200ns bus-relinquish).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with ±1/2 LSB integral nonlinearity (INL) over 0°C to +70°C |
| Sample Rate | Guaranteed 100ksps - enables real-time capture of 50kHz baseband signals without aliasing |
| Conversion Time | 7.5µs - fixed latency from BUSY low to BUSY high, synchronous with external or internal 1.6MHz clock |
| Reference | Internal 4.096V ±20mV VREF with REFADJ trim input; supports external reference when REFADJ = VDD |
| Supply Range | +5V ±5% (VDD) and 0V or –5V ±5% (VSS) - permits true bipolar input operation with ground-referenced signals |
| Power-Down Current | 50µA max - reduces IDD from 3mA to near-zero while retaining bandgap reference stability |
| Input Bandwidth | 2MHz small-signal bandwidth - supports accurate digitization of transients up to 30V/µs slew rate |
Pinout & Package
MAX191BCWG is housed in a 24-pin wide SOIC (SO) package, 7.6mm body width, 1.27mm pitch, RoHS-compliant. Pin functions are electrically validated per Maxim's 19-4506 Rev 4 datasheet and functional 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 bipolar input range when used with AGND |
| AGND (Pin 8) | 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 logic I/O; connected to system digital ground plane |
| AIN+ (Pin 2) | Primary analog input | Sampled node for pseudo-differential configuration; accepts 0V to VREF (unipolar) or ±VREF/2 (bipolar) |
| AIN− (Pin 3) | Analog input return | Pseudo-differential reference; must remain stable within ±0.5LSB vs AGND during conversion |
| VREF (Pin 5) | Reference buffer output | 4.096V internal reference source; also serves as external reference input when REFADJ = VDD |
| REFADJ (Pin 4) | Reference trim input | Adjusts VREF gain error; 2.4V to 5.0V range yields ~1.7× VREF change |
| CLK/SCLK (Pin 22) | Clock input / serial clock | Accepts external 100kHz–1.6MHz TTL/CMOS clock or drives internal oscillator via 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 | Starts conversion in parallel memory mode; enables SCLKOUT/SSTRB in serial mode when CS = low |
| BUSY (Pin 17) | Conversion status output | Active-low open-drain signal; low during conversion, high when result is latched and ready |
| PAR (Pin 21) | Interface mode select | High = parallel mode; low = serial mode; configures D7/DOUT, D6/SCLKOUT, D5/SSTRB functionality |
| HBEN (Pin 20) | High-byte enable | In parallel mode: low = output LSBs (D7–D0); high = output MSBs (D11–D8) on D3–D0 with D4–D7 = 0 |
| PD (Pin 9) | Power-down control | Low = 50µA standby; high = normal operation; floating = external-reference compensation mode |
| BIP (Pin 6) | Bipolar/unipolar select | High = bipolar mode (MSB inverted); low = unipolar mode (straight binary output) |
| D0/D8–D7/DOUT (Pins 10–16, 13) | Data I/O bus | Three-state outputs; multiplexed for parallel data (D7–D0) or serial functions (DOUT, SCLKOUT, SSTRB) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates need for external hold capacitor; achieves 2µs acquisition time with 50ps aperture jitter |
| Internal voltage reference | 4.096V ±20mV VREF with 80ppm/°C tempco and REFADJ trim input for system-level gain calibration |
| Flexible µP interface | Supports SPI/MICROWIRE/QSPI serial and two 8-bit parallel read modes-no glue logic required |
| Low-power operation | 3mA active current and 50µA power-down current enable battery life extension in portable instruments |
| Dual-supply compatibility | Operates from +5V only or ±5V - allows direct digitization of ±2.048V bipolar signals without level-shifting |
Applications
| Battery-Powered Data Logging | PC Pen Digitizers |
|---|---|
Use Scenario: Portable environmental sensor nodes logging temperature, pressure, and humidity over weeks on coin-cell batteries. IC Role / Device Role / Timing Role: Primary ADC acquiring conditioned analog sensor outputs at 10–100Hz with minimal power overhead. Use Value: 50µA power-down current extends battery life; internal reference eliminates external precision voltage source; 12-bit resolution captures sub-0.1% sensor drift. |
Use Scenario: Real-time coordinate capture in stylus-based tablet interfaces with <1ms latency requirements. IC Role / Device Role / Timing Role: High-speed sampling ADC converting analog pen position signals into digital coordinates for USB HID reporting. Use Value: 100ksps sample rate supports >50kHz pen movement bandwidth; 7.5µs conversion time ensures deterministic response; pseudo-differential input rejects common-mode noise from display EMI. |
| High-Accuracy Process Control | Electromechanical Systems |
Use Scenario: Closed-loop feedback in industrial PLC analog I/O modules measuring 4–20mA current loops and thermocouple outputs. IC Role / Device Role / Timing Role: Precision front-end ADC providing calibrated 12-bit readings for PID controller inputs. Use Value: ±1/2 LSB INL and ±1 LSB DNL ensure <0.025% measurement linearity; REFADJ trim compensates for system gain drift across temperature. |
Use Scenario: Motor phase current sensing and position feedback in servo drives and robotic joints. IC Role / Device Role / Timing Role: Isolated analog input conditioner feeding current-sense amplifiers into the MAX191BCWG for real-time current profiling. Use Value: Bipolar input mode directly digitizes bidirectional motor currents; 2MHz analog bandwidth captures PWM switching artifacts; ±5V dual supply matches isolated amplifier outputs. |
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 ADC with 200ksps, no internal reference, requires external 2.5V ref; 8-pin SOIC | Lacks internal reference and bipolar input support; suited for space-constrained unipolar-only designs | Select when higher speed and smaller footprint outweigh reference integration needs |
| AD7892BRZ-1 | 12-bit SAR ADC with 600ksps, internal 2.5V ref, ±5V supply, but no REFADJ trim or serial interface | Higher speed and better SNR (74dB), but lacks serial mode and gain-adjust capability | Select for high-throughput unbuffered acquisition where trimming and interface flexibility are secondary |
Compared with ADS7816U and AD7892BRZ-1, the MAX191BCWG uniquely combines internal 4.096V reference with REFADJ trim, dual ±5V supply operation for true bipolar input, and SPI/MICROWIRE/parallel interface modes-all in a single 24-pin wide SO package-making it optimal for portable, calibration-sensitive, and mixed-interface embedded systems.
Availability
MAX191BCWG is available at Aetrix Electronics and suitable for battery-powered data loggers, PC digitizers, and high-accuracy process control systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX191BCWG 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 high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX191 product line was designed for low-power, precision data acquisition in portable and embedded systems-emphasizing integrated references, flexible µP interfacing, and robust bipolar signal handling without external support components.
FAQ
What is the operating temperature range for the MAX191BCWG?
The MAX191BCWG is specified for operation from 0°C to +70°C, as indicated by the 'C' suffix in its part number. This commercial-grade temperature range is validated across all key parameters including INL (±1 LSB), offset error (±2 LSB), and reference output (4.096V ±20mV). The device maintains full 12-bit performance without derating within this range, making it suitable for indoor industrial and consumer equipment environments where ambient temperatures remain controlled.
Does the MAX191BCWG require external passive components for basic operation?
Yes, the MAX191BCWG requires only decoupling capacitors: a 4.7µF capacitor on VREF (Pin 5) and 0.1µF capacitors on VDD (Pin 24) and AGND (Pin 8), as shown in Figure 3 of the datasheet. No external hold capacitor, reference buffer, or clock crystal is needed-the internal track/hold, 4.096V reference, and capacitor-timed oscillator eliminate these components, reducing BOM count and PCB area for the MAX191BCWG in compact designs.
How does the REFADJ pin function in the MAX191BCWG?
The REFADJ pin (Pin 4) on the MAX191BCWG provides a trim input to adjust the internal 4.096V reference voltage. Applying 2.4V–5.0V to REFADJ changes VREF by approximately 1.7× that voltage excursion, enabling system-level gain calibration to correct for sensor or signal-chain errors. When REFADJ is tied to VDD, the MAX191BCWG switches to external-reference mode, allowing use of a higher-precision or temperature-stable reference source instead of the internal one.
Can the MAX191BCWG interface directly with an SPI microcontroller?
Yes, the MAX191BCWG supports native SPI communication when PAR = low. In serial mode, it uses CS (Pin 19) as chip select, SCLK (Pin 22) as clock input, SSTRB (Pin 16) as frame strobe, and DOUT (Pin 13) as data output-fully compatible with standard SPI master peripherals. The MAX191BCWG does not require mode configuration bits or software initialization; interface behavior is determined solely by hardware pin states (PAR, RD, CS), simplifying firmware integration.
What is the significance of the 'B' grade in MAX191BCWG?
The 'B' in MAX191BCWG denotes the device's accuracy grade: ±1 LSB integral nonlinearity (INL) and ±2 LSB offset error over 0°C to +70°C, tighter than the 'A' grade (±1/2 LSB INL) but more cost-effective. This B-grade specification ensures reliable 12-bit monotonicity and <0.025% end-point linearity for most industrial and instrumentation applications-making the MAX191BCWG a balanced choice between precision, price, and availability without sacrificing functional integrity.
MAX191BCWG 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX191BCWG FAQ
1.How can I place an order for MAX191BCWG through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX191BCWG 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 reliable?
The price and inventory of MAX191BCWG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX191BCWG is usually 5 days.
3.What payment methods are accepted for MAX191BCWG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX191BCWG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX191BCWG?
MAX191BCWG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX191BCWG 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?
For technical support, including MAX191BCWG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX191BCWG requirements.
6.How does Aetrix verify that MAX191BCWG is sourced from the original manufacturer or authorized distributors?
All MAX191BCWG 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 meets industry standards.
7.What is the process for return or replacement of MAX191BCWG?
All MAX191BCWG units undergo pre-shipment inspection (PSI). If there is an issue with MAX191BCWG, 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 part is unused and in its original packaging.
Return procedure for MAX191BCWG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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