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Analog Devices Inc./Maxim Integrated MAX191ACWG+T
- Part No.:
- MAX191ACWG+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX191ACWG+T.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,081
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Product details
Overview
The MAX191ACWG+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 selectable parallel or SPI/MICROWIRE/QSPI serial 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 MAX191ACWG+T datasheet, MAX191ACWG+T pinout, MAX191ACWG+T application, or MAX191ACWG+T equivalent, this page provides verified technical context, package-specific pin functions, real-world interface timing constraints, and validated alternative options for low-power, high-accuracy 12-bit sampling systems requiring internal reference and power-down capability.
Technical Context
The MAX191ACWG+T implements a SAR architecture with on-chip track/hold that acquires signals in ≤2µs and exhibits 25ns aperture delay with 50ps jitter. Its internal reference delivers 4.096V ±20mV at +25°C with 80ppm/°C tempco and supports external trimming via REFADJ (±0.1V range around 2.4V), enabling system-level gain error correction.
Interface flexibility includes three modes: slow-memory parallel (two 8-bit reads), ROM-mode parallel (three-read sequence), and synchronous serial mode compatible with SPI, QSPI, and MICROWIRE standards - all controlled by PAR, HBEN, CS, and RD with BUSY-driven handshaking and three-state outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with ±1/2 LSB integral nonlinearity (INL) and ±1/2 LSB offset error over 0°C to +70°C - ensures monotonicity and <0.025% full-scale linearity error in precision measurement. |
| Sample Rate | Guaranteed 100ksps (10µs period) with 7.5µs conversion + 2µs acquisition - supports real-time capture of 50kHz baseband signals without undersampling artifacts. |
| Reference | Internal 4.096V bandgap reference (±20mV at +25°C, 80ppm/°C drift); REFADJ pin allows ±0.1V adjustment to correct system gain errors up to ±1.7× output change. |
| Power Modes | 3mA active supply current (VDD = +5V); 50µA max power-down current with PD = low - enables battery operation >100 hours in sleep-wake cycles. |
| Analog Input | Pseudo-differential AIN+/AIN− with ±5V dual-supply support; unipolar/bipolar mode selected by BIP pin; input protection clamps to VSS–0.3V / VDD+0.3V. |
| Digital Interface | Parallel (8-bit bus, HBEN-controlled byte multiplexing) or serial (SPI/QSPI/MICROWIRE-compatible, SCLKOUT/SSTRB/DOUT); BUSY pin indicates conversion status. |
| Timing Accuracy | 25ns aperture delay, 50ps aperture jitter, and 13-clock-cycle conversion (1.6MHz max CLK) - limits SNR degradation to <0.5dB at 1kHz input. |
Pinout & Package
MAX191ACWG+T is housed in a 24-pin wide SO (SOIC-W) package (body width 7.5mm), RoHS-compliant, with standard JEDEC MS-013AC footprint and 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (24) | Positive supply | +5V ±5% main power rail; powers analog core, reference, and digital logic - requires 0.1µF ceramic decoupling to DGND. |
| VSS (1) | Negative supply | 0V or –5V ±5% return for bipolar operation; must be stable within ±0.5LSB during conversion to avoid differential error. |
| AGND (23) | Analog ground | Separate ground return for analog section; must be star-connected to DGND at single point to minimize noise coupling. |
| DGND (12) | Digital ground | Ground reference for logic I/O; isolated from AGND except at PCB common point - prevents digital switching noise from modulating ADC performance. |
| AIN+ (2), AIN− (3) | Differential analog inputs | Pseudo-differential sampling node; AIN− must remain stable vs. AGND (±0.1LSB ideal) - use 0.1µF capacitor from AIN− to AGND. |
| REFADJ (6), VREF (7) | Reference adjust/output | VREF outputs 4.096V internal reference; REFADJ accepts 2.4V ±0.1V to trim gain error - connects to VDD for extended-range external reference mode. |
| CLK/SCLK (22) | Clock input | Accepts 100kHz–1.6MHz external TTL/CMOS clock or drives internal oscillator with 120pF capacitor to DGND (≈1MHz). |
| PAR (21), HBEN (20), CS (19), RD (18) | Interface control | PAR selects parallel/serial mode; HBEN enables high-byte read or serial clock gating; CS/RD initiate conversion and enable outputs - synchronized to avoid clock feedthrough. |
| BUSY (17), D0/D8–D7/DOUT (10–16) | Status & data I/O | BUSY low during conversion; D0–D7 are three-state outputs - multiplexed for 8-bit parallel or serial-shifted 12-bit result (D11–D0) with SCLKOUT/SSTRB strobes. |
| PD (9), BIP (5) | Power & mode control | PD = low disables ADC (50µA standby); BIP = high enables bipolar input range (–VREF to +VREF), BIP = low sets unipolar (0 to +VREF). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates need for external hold capacitor; acquires full-scale step in ≤2µs with 50ps jitter - simplifies front-end design and reduces board area. |
| Internal 4.096V reference | Stable ±20mV at +25°C with 80ppm/°C drift and REFADJ trim - enables calibrated measurements without external precision reference ICs. |
| Low-power operation | 3mA active current and 50µA power-down current - extends battery life in portable instrumentation and remote sensors. |
| Flexible µP interface | Supports slow-memory, ROM, and serial modes with BUSY handshaking - interfaces directly to 8-bit microcontrollers without glue logic. |
| Dual-supply analog input | Operates with ±5V supplies to accept true bipolar signals (–5V to +5V) referenced to AGND - ideal for industrial transducer interfaces. |
Applications
| Battery-Powered Data Logging | PC Pen Digitizers |
|---|---|
|
Use Scenario: Continuous 12-bit sampling of temperature, pressure, or voltage sensors in field-deployed environmental monitors powered by Li-ion batteries. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor outputs at 10–100ksps with internal reference stability and power-down between samples. Use Value: 50µA power-down current extends battery life to >1 year; internal reference eliminates calibration drift across temperature; pseudo-differential input rejects common-mode noise from long sensor cables. |
Use Scenario: Real-time digitization of stylus position and pressure in tablet PCs and graphics tablets using resistive or capacitive pen sensors. IC Role / Device Role / Timing Role: High-speed sampling ADC interfacing to microcontroller via parallel bus, acquiring X/Y coordinate and pressure data with <2µs acquisition. Use Value: 7.5µs conversion time enables >100 points/sec tracking; bipolar input mode supports negative offset compensation; BUSY-driven handshaking prevents data overrun during rapid pen movement. |
| High-Accuracy Process Control | Automatic Testing Systems |
|
Use Scenario: Closed-loop feedback in PLC analog I/O modules measuring 4–20mA current loops, thermocouples, or strain gauge bridges with <0.025% FS accuracy. IC Role / Device Role / Timing Role: Precision ADC providing calibrated 12-bit readings with REFADJ-trimmed gain and ±1/2 LSB INL over 0°C to +70°C operating range. Use Value: Internal reference tempco (80ppm/°C) and trimmable gain ensure <0.1% total error across industrial temperature range; dual-supply operation accommodates isolated sensor front-ends. |
Use Scenario: Functional test of mixed-signal boards where analog stimulus generation and response measurement require synchronized sampling at known intervals. IC Role / Device Role / Timing Role: Sampling ADC triggered by test controller via CS/RD, delivering 12-bit results with deterministic 7.5µs conversion latency and BUSY status. Use Value: Guaranteed 100ksps rate enables Nyquist-compliant capture of 50kHz test signals; SPI-compatible serial mode simplifies integration into automated test equipment with minimal pin count. |
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, 200ksps, single +5V supply only, no internal reference - requires external 4.096V reference and external track/hold. | Higher speed but lacks integrated reference and bipolar input support - suitable for unipolar, high-throughput systems with existing reference infrastructure. | Select when sample rate >100ksps is critical and board space allows external reference/TH; avoid if bipolar input or reference trimming is required. |
| MAX11131AUT+T | 12-bit SAR, 500ksps, internal 2.048V reference, SPI-only interface, 6-pin SOT23 - no parallel mode, no REFADJ, smaller package. | Ultra-compact, higher-speed option with lower reference voltage - optimized for space-constrained, unipolar sensor nodes rather than general-purpose data acquisition. | Select for miniaturized designs needing >100ksps and minimal footprint; avoid if parallel interface, bipolar input, or reference trimming is needed. |
Compared with ADS7816U and MAX11131AUT+T, the MAX191ACWG+T uniquely combines internal 4.096V reference with REFADJ trim, dual-supply bipolar input, parallel/serial interface flexibility, and 100ksps performance in a standard 24-pin SOIC - making it optimal for mid-speed, precision, multi-interface industrial and portable measurement systems.
Availability
MAX191ACWG+T 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-term lifecycle support, and traceable sourcing.
Supply support for MAX191ACWG+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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX191 belongs to Maxim's precision data acquisition product line, designed specifically for low-power, high-accuracy 12-bit sampling in portable and embedded systems requiring integrated reference, flexible interface, and robust analog input handling.
FAQ
What is the operating temperature range for the MAX191ACWG+T?
The MAX191ACWG+T is rated for 0°C to +70°C ambient operation, as indicated by the 'C' grade suffix in its part number. This commercial-grade temperature range is validated across all electrical specifications including ±1/2 LSB INL, 100ksps sample rate, and internal reference stability - making it suitable for indoor industrial controls and consumer electronics where extreme thermal stress is not expected.
Does the MAX191ACWG+T require external components for its internal reference to function?
No, the MAX191ACWG+T's internal 4.096V reference operates with only a 4.7µF capacitor from VREF to AGND (as specified in Figure 3 of the datasheet). The REFADJ pin is optional and used only when system-level gain trimming is needed; leaving REFADJ open or tied to AGND configures standard internal reference operation without additional parts.
Can the MAX191ACWG+T interface directly with an Arduino or similar 5V microcontroller?
Yes, the MAX191ACWG+T is fully compatible with 5V microcontrollers: its digital I/O thresholds (VIH = 2.4V, VIL = 0.8V) meet TTL/CMOS levels, and it supports SPI communication (via CS, SCLK, SSTRB, DOUT) as well as 8-bit parallel reads. No level-shifting is required - simply connect VDD to 5V, DGND to MCU ground, and use BUSY polling or interrupt-driven reads for reliable data capture.
How does the pseudo-differential input architecture of the MAX191ACWG+T affect signal acquisition?
The MAX191ACWG+T's pseudo-differential input samples only AIN+ while holding AIN− stable relative to AGND (±0.1LSB ideal). This means AIN− must be decoupled with a 0.1µF capacitor to AGND and kept free of fast transients - unlike true differential ADCs, it does not reject common-mode noise on both inputs, but still enables bipolar signal acquisition with simplified front-end design.
What is the minimum acquisition time required before starting the next conversion on the MAX191ACWG+T?
The guaranteed acquisition time for the MAX191ACWG+T is 2µs, as specified in the Electrical Characteristics table. However, actual acquisition depends on source impedance: tACQ = 10(RS + 2kΩ) × 32pF. For low-impedance sources (<1kΩ), 2µs suffices; for higher impedances, extend inter-conversion delay accordingly to avoid missing codes or gain errors.
MAX191ACWG+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:
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX191ACWG+T FAQ
1.How can I place an order for MAX191ACWG+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX191ACWG+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 MAX191ACWG+T reliable?
The price and inventory of MAX191ACWG+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX191ACWG+T is usually 5 days.
3.What payment methods are accepted for MAX191ACWG+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX191ACWG+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX191ACWG+T?
MAX191ACWG+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX191ACWG+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 MAX191ACWG+T?
For technical support, including MAX191ACWG+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX191ACWG+T requirements.
6.How does Aetrix verify that MAX191ACWG+T is sourced from the original manufacturer or authorized distributors?
All MAX191ACWG+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 MAX191ACWG+T meets industry standards.
7.What is the process for return or replacement of MAX191ACWG+T?
All MAX191ACWG+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX191ACWG+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 MAX191ACWG+T part is unused and in its original packaging.
Return procedure for MAX191ACWG+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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