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Analog Devices Inc./Maxim Integrated MAX192ACAP
- Part No.:
- MAX192ACAP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX192ACAP.pdf
- Description:
- IC ADC 10BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,369
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Product details
Overview
MAX192ACAP from Maxim Integrated is a low-power, 8-channel, serial 10-bit analog-to-digital converter (ADC) with integrated track/hold, internal 4.096V reference, and SPI/QSPI/Microwire-compatible 4-wire serial interface. It operates from a single +5V supply, supports software-configurable single-ended or differential (unipolar/bipolar) inputs, and achieves 133ksps sampling rate with 1.5mA operating current. It is used in battery-powered data loggers and portable medical instruments requiring precision, low power, and compact footprint.
For engineers reviewing the MAX192ACAP datasheet, MAX192ACAP pinout, MAX192ACAP application, or MAX192ACAP equivalent, this page delivers verified technical context, exact pin functions, real-world use-value per application, validated alternatives with documented functional differences, and supply-chain-ready availability details - all grounded in the official MAX192 family datasheet (Rev. 1, 4/97) and Maxim's product specifications.
Technical Context
The MAX192ACAP implements a successive-approximation register (SAR) ADC architecture with an on-chip track/hold amplifier and flexible 8-channel analog multiplexer. Its conversion timing is governed by either an internal clock (enabling up to 10MHz serial readout) or an external serial clock (up to 10MHz), with acquisition time fixed at 1.5µs minimum and aperture jitter under 50ps.
It features dual power-down modes (fast: 30µA; full: 2µA), a three-level SHDN pin for shutdown control and reference-buffer compensation mode selection, and hardware-compatible data framing with SPI (CPOL=0, CPHA=0), QSPI, and Microwire protocols. The internal 4.096V reference has ±30ppm/°C drift and supports external adjustment via REFADJ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR - delivers 1024 discrete output codes with no missing codes over temperature (MAX192A grade) |
| Sampling Rate | 133ksps - enables real-time capture of signals up to 65kHz full-power bandwidth |
| Analog Inputs | 8-channel single-ended or 4-channel differential - configurable via control byte bits SGL/DIF and UNI/BIP |
| Reference | Internal 4.096V ±0.75% (±30ppm/°C drift) - eliminates need for external reference in most applications |
| Supply Current | 1.5mA active / 2µA full power-down - enables >1-year battery life in intermittent-sampling systems |
| Interface | 4-wire SPI/QSPI/Microwire - direct connection to TMS320 DSPs via SSTRB strobe without glue logic |
| INL / DNL | ±1 LSB / ±1 LSB (MAX192A) - ensures monotonicity and <0.1% end-point linearity error after calibration |
Pinout & Package
MAX192ACAP is housed in a 20-pin shrink small-outline package (SSOP), occupying 30% less board area than an 8-pin DIP. Pin functions are electrically identical across DIP/SO/SSOP variants per Maxim's pin compatibility guarantee.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Selectable as single-ended inputs (vs. AGND) or differential pairs (CH0/CH1, CH2/CH3, etc.) via control byte |
| AGND (Pins 9, 13) | Analog ground reference | Must be tied to clean analog ground; serves as IN− in single-ended mode and common-mode reference in differential mode |
| SHDN (Pin 10) | Three-level shutdown control | Low = 10µA shutdown; high = internal compensation; floating = external compensation (4.7µF at VREF) |
| VREF (Pin 11) | Reference voltage output/input | Delivers 4.096V (internal ref) or accepts external precision reference; requires 4.7µF bypass in external-comp mode |
| REFADJ (Pin 12) | Reference buffer gain control | Tie to VDD to disable buffer; adjust to trim VREF output within ±1.5% range using external resistor divider |
| DGND (Pin 14) | Digital ground return | Separate from AGND to minimize digital noise coupling into analog path; must be connected to system digital ground |
| DOUT (Pin 15) | Serial data output | MSB-first, clocked on SCLK falling edge; high-impedance when CS is high |
| SSTRB (Pin 16) | Serial strobe output | Signals conversion start/end: low during conversion (internal clock) or pulses high before MSB (external clock) |
| DIN (Pin 17) | Serial data input | Accepts 8-bit control byte (START, SEL2–SEL0, UNI/BIP, SGL/DIF, PD1/PD0) on SCLK rising edge |
| CS (Pin 18) | Active-low chip select | Enables serial interface; DOUT and SSTRB enter high-Z state when CS is high |
| SCLK (Pin 19) | Serial clock input | Drives data transfer and (in external mode) conversion timing; duty cycle 40–60% required |
| VDD (Pin 20) | +5V ±5% supply | Single-supply operation only; absolute max rating is +6V; PSR = ±0.5mV over VDD variation |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (8 ch) or differential (4 ch) with unipolar/bipolar support - eliminates external mux or level-shifting circuitry |
| Integrated track/hold with 1.5µs acquisition | Removes need for external hold capacitor and reduces layout sensitivity to source impedance (RS ≤ 5kΩ) |
| Two sub-LSB bits | Provides 12-bit data frame (10 true + 2 fractional bits) - improves effective resolution for averaging or oversampling |
| Pin-compatible 12-bit upgrade path | Direct replacement with MAX186/MAX188 - same pinout, interface, and control protocol; enables resolution scaling without PCB change |
| Three power-down states | Full shutdown (2µA), fast wake-up (30µA), and active (1.5mA) - allows dynamic power management per sample interval |
Applications
| Battery-Powered Data Logging | Portable Medical Instrumentation |
|---|---|
Use Scenario: Continuous voltage/current monitoring in handheld ECG or glucose meters with multi-day battery life. IC Role / Device Role / Timing Role: ADC front-end digitizing biopotential signals at 1–10ksps with ultra-low quiescent current between samples. Use Value: 2µA full power-down current extends CR2032 battery life beyond 18 months in sleep-wake cycles; internal reference eliminates calibration drift. |
Use Scenario: Analog sensor interfacing in portable pulse oximeters requiring precise ratiometric measurement against LED drive current. IC Role / Device Role / Timing Role: Simultaneous sampling of photodiode and reference channel via pseudo-differential mode to reject common-mode LED noise. Use Value: ±1 LSB INL and 70dB channel-to-channel crosstalk ensure accurate SpO₂ calculation; SSOP package fits tight space constraints. |
| Automotive Body Control Modules | Industrial Sensor Signal Conditioning |
Use Scenario: Monitoring cabin temperature, seat position, and door lock status in 12V automotive subsystems with wide ambient temperature range. IC Role / Device Role / Timing Role: Low-voltage ADC acquiring thermistor, potentiometer, and switch inputs while surviving load-dump transients. Use Value: ±30ppm/°C reference drift maintains accuracy from −40°C to +85°C (E-grade compatible); AGND/DGND separation prevents CAN bus noise coupling. |
Use Scenario: Digitizing 4–20mA loop outputs or RTD bridge signals in programmable logic controller (PLC) I/O modules. IC Role / Device Role / Timing Role: High-accuracy ADC with internal reference buffering signal chains where external references add cost and board area. Use Value: Internal 4.096V reference with ±0.75% initial tolerance and REFADJ trim simplifies factory calibration; 133ksps supports fast loop update rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX186BCPP | 12-bit resolution, same 20-pin DIP/SO/SSOP pinout, identical serial interface and control protocol | Higher resolution required for precision sensor measurement; same power profile (1.6mA active) | Select MAX186BCPP when 12-bit accuracy is mandatory and board layout reuse is critical |
| ADS7822U | 12-bit, SPI-only interface (no QSPI/Microwire), 2.7–5.25V supply, 1.25mW typical power at 5V | Lower supply voltage operation needed; lacks SSTRB strobe for DSP sync | Choose ADS7822U for mixed-voltage systems or when TI ecosystem integration is preferred |
Compared with MAX192ACAP, MAX186BCPP offers higher resolution with zero layout impact, while ADS7822U provides wider supply range and lower voltage operation but sacrifices multi-protocol compatibility and DSP strobe capability - making MAX192ACAP optimal for legacy SPI/QSPI designs needing proven low-power performance in +5V systems.
Availability
MAX192ACAP is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX192ACAP 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 demanding industrial, automotive, and medical applications.
The MAX192ACAP belongs to Maxim's low-power serial ADC product line, engineered specifically for portable and energy-constrained systems requiring high accuracy, minimal external components, and seamless microcontroller integration via standard serial protocols.
FAQ
What is the operating temperature range of the MAX192ACAP?
The MAX192ACAP is specified for 0°C to +70°C operation, as indicated by the "AC" suffix in its part number (MAX192ACAP). This commercial-grade temperature range aligns with standard industrial and consumer equipment requirements. The device maintains ±1 LSB INL and ±1 LSB DNL across this full range, and its internal 4.096V reference exhibits ±30ppm/°C typical drift - ensuring consistent accuracy without external calibration.
Does the MAX192ACAP require external components for basic operation?
Yes, the MAX192ACAP requires at minimum a 4.7µF capacitor from VREF to AGND when using external compensation mode (SHDN floating), and 0.01µF capacitors on REFADJ and VDD. A 0.1µF capacitor is recommended on each analog input for high-source-impedance signals. No external track/hold capacitor or reference IC is needed - the internal track/hold and 4.096V reference eliminate those bill-of-materials items, reducing total solution size and cost.
How does the MAX192ACAP handle differential input configurations?
The MAX192ACAP supports pseudo-differential inputs via its internal multiplexer: in differential mode (SGL/DIF = 0), it samples the voltage difference between paired channels (e.g., CH0–CH1, CH2–CH3). The negative input (IN−) must remain stable within ±0.5LSB of AGND during conversion - achieved by placing a 0.1µF capacitor from the selected IN− channel to AGND. Output coding is twos-complement for bipolar differential mode and straight binary for unipolar differential mode.
Can the MAX192ACAP interface directly with a TMS320 DSP?
Yes, the MAX192ACAP interfaces directly with TMS320 family DSPs using its dedicated SSTRB (serial strobe) output. In internal clock mode, SSTRB goes low at conversion start and high upon completion - enabling precise hardware-triggered data reads. In external clock mode, SSTRB pulses high for one clock period before the MSB appears on DOUT, allowing synchronous capture without polling or software delay loops - eliminating the need for external logic or GPIO bit-banging.
What power-down modes does the MAX192ACAP support, and how are they controlled?
The MAX192ACAP supports two software-selectable power-down modes via bits PD1/PD0 in the control byte: full power-down (PD1=0, PD0=0) draws ≤2µA, and fast power-down (PD1=0, PD0=1) draws ≤30µA with quicker wake-up. Additionally, the SHDN pin provides hardware shutdown: pulling SHDN low forces full power-down (≤10µA), independent of serial commands. All modes retain register state, allowing immediate resumption of conversion upon wake-up.
MAX192ACAP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 133k
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX192ACAP FAQ
1.How can I place an order for MAX192ACAP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX192ACAP 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 MAX192ACAP reliable?
The price and inventory of MAX192ACAP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX192ACAP is usually 5 days.
3.What payment methods are accepted for MAX192ACAP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX192ACAP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX192ACAP?
MAX192ACAP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX192ACAP 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 MAX192ACAP?
For technical support, including MAX192ACAP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX192ACAP requirements.
6.How does Aetrix verify that MAX192ACAP is sourced from the original manufacturer or authorized distributors?
All MAX192ACAP 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 MAX192ACAP meets industry standards.
7.What is the process for return or replacement of MAX192ACAP?
All MAX192ACAP units undergo pre-shipment inspection (PSI). If there is an issue with MAX192ACAP, 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 MAX192ACAP part is unused and in its original packaging.
Return procedure for MAX192ACAP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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