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Analog Devices Inc./Maxim Integrated MAX186DEPP
- Part No.:
- MAX186DEPP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX186DEPP.pdf
- Description:
- IC ADC 12BIT SAR 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,380
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Product details
Overview
MAX186DEPP from Maxim Integrated is a low-power, 12-bit successive-approximation analog-to-digital converter (ADC) with integrated 8-channel multiplexer, track/hold, and SPI-/QSPI-/MICROWIRE-compatible 4-wire serial interface. It operates from a single +5V supply or dual ±5V supplies, features an internal 4.096V reference, software-configurable unipolar/bipolar and single-ended/differential inputs, and achieves 133ksps sampling rate with 1.5mA operating current - used in portable data loggers and battery-powered medical instruments.
For engineers reviewing the MAX186DEPP datasheet, MAX186DEPP pinout, MAX186DEPP application, or MAX186DEPP equivalent, this page delivers verified technical context, real-world design meaning for key specs (e.g., 1.5µs acquisition time, ±1.0 LSB relative accuracy), package-specific layout guidance, and two confirmed alternative ADCs for similar 12-bit serial data-acquisition use cases.
Technical Context
The MAX186DEPP implements a capacitive DAC-based successive-approximation architecture with integrated track/hold circuitry, supporting both internal clock (up to 10MHz serial readout) and external clock (up to 4MHz) operation modes. Its analog front-end accepts up to eight single-ended or four differential inputs, with input common-mode range spanning VSS to VDD and on-chip reference-buffer amplifier enabling precise gain trim via REFADJ.
Conversion control is fully software-defined via an 8-bit command byte specifying channel, polarity, input mode, and power-down state. The device supports three power-down modes (full, fast, and internal-clock active), achieving <10µA quiescent current between conversions - critical for energy-constrained embedded sensing nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 1 part in 4096 full-scale precision for high-accuracy sensor digitization. |
| Sampling Rate | 133ksps - enables real-time capture of signals up to ~66kHz (Nyquist-limited) without aliasing when paired with anti-alias filter. |
| Relative Accuracy | ±1.0 LSB - ensures monotonicity and ≤0.024% full-scale error after calibration, meeting industrial process control requirements. |
| Supply Current | 1.5mA (active), 2µA (full power-down) - allows duty-cycled operation in battery-powered systems with >1-year runtime at 10Hz sampling. |
| Input Bandwidth | 4.5MHz small-signal - supports undersampling of RF or transient events while maintaining integrity of baseband measurements. |
| Reference | Internal 4.096V (±30ppm/°C tempco) - eliminates external reference component count and simplifies PCB layout for compact designs. |
| Serial Interface | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire - interoperates directly with common microcontrollers without level-shifting or glue logic. |
Pinout & Package
MAX186DEPP is supplied in a 20-pin plastic DIP (PDIP) package with 0.3-inch body width, RoHS-compliant lead finish, and through-hole mounting compatibility for prototyping and legacy industrial assemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Software-selectable as eight single-ended or four differential inputs; each supports ±5V input swing with internal clamping diodes. |
| VSS (Pin 9) | Negative Supply Rail | Accepts 0V (unipolar) or –5V (bipolar) - defines analog input common-mode baseline and reference return path. |
| SHDN (Pin 10) | Three-Level Control Input | Pull low for 10µA shutdown; leave floating for external compensation; pull high to enable internal compensation mode for VREF stability. |
| VREF (Pin 11) | Reference Voltage Node | Outputs 4.096V (MAX186) or buffers external REFADJ-derived voltage; requires 4.7µF bypass capacitor in external-compensation mode. |
| REFADJ (Pin 12) | Reference Buffer Gain Control | Adjusts VREF output via resistor divider; connect to VDD to disable buffer - essential for precision external reference use in MAX188 variants. |
| AGND (Pin 13) | Analog Ground Reference | Return for analog inputs and internal T/H circuitry; must be separated from DGND and tied at single point to minimize noise coupling. |
| DGND (Pin 14) | Digital Ground Reference | Return for serial interface and logic circuits; isolation from AGND prevents digital switching noise from corrupting conversion accuracy. |
| DOUT (Pin 15) | Serial Data Output | 3-state MSB-first output synchronized to SCLK falling edge; high-impedance when CS is high to allow bus sharing. |
| SSTRB (Pin 16) | Serial Strobe Output | Indicates conversion start/end: low during conversion (internal clock) or pulses high before MSB (external clock) - enables synchronous DSP interfacing. |
| DIN (Pin 17) | Serial Data Input | Accepts 8-bit command byte on SCLK rising edge; first '1' bit after CS fall initiates control word parsing - tolerant of leading zeros. |
| CS (Pin 18) | Chip Select | Active-low enable for serial interface; controls DOUT/SSTRB tri-state behavior and prevents spurious conversions during bus contention. |
| SCLK (Pin 19) | Serial Clock Input | Drives data transfer and (in external mode) conversion timing; 40–60% duty cycle required; max 4MHz for reliable SAR operation. |
| VDD (Pin 20) | Positive Supply Rail | +5V ±5% main power; powers analog and digital sections; PSR of ±0.06mV ensures immunity to supply ripple in noisy environments. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel multiplexer with pseudo-differential architecture | Enables flexible signal routing across sensors or transducers while minimizing external components - no hold capacitors needed. |
| Software-configurable unipolar/bipolar and single-ended/differential modes | Eliminates need for external signal conditioning circuitry; supports direct connection of thermocouples, strain gauges, and current-sense amplifiers. |
| Internal track/hold with 1.5µs acquisition time | Reduces external anti-alias filter complexity and allows accurate sampling of high-Z sources (<5kΩ) without added settling delay. |
| Three selectable power-down modes | Supports adaptive power management: full shutdown (2µA), fast wake-up (30µA), or internal-clock active (ready for immediate conversion). |
| Reference-buffer amplifier with REFADJ pin | Permits fine gain trimming and external reference integration - critical for metrology-grade calibration and multi-device matching. |
Applications
| Portable Data Logging | Data-Acquisition Systems |
|---|---|
|
Use Scenario: Battery-powered environmental monitor logging temperature, humidity, and pressure over weeks. IC Role / Device Role / Timing Role: Primary ADC digitizing multiple sensor outputs via multiplexed analog inputs; internal reference ensures stable full-scale across temperature. Use Value: 1.5mA active current and 2µA shutdown extend battery life beyond 12 months at 1Hz sampling; 12-bit resolution captures sub-degree thermal changes. |
Use Scenario: Rack-mounted industrial DAQ unit acquiring synchronized analog signals from PLC I/O modules. IC Role / Device Role / Timing Role: High-accuracy front-end ADC with software-selectable bipolar input range for ±10V industrial signals. Use Value: ±1.0 LSB relative accuracy and 80dB THD meet Class A measurement standards; SPI interface simplifies FPGA-based controller integration. |
| Medical Instruments | Battery-Powered Test Equipment |
|
Use Scenario: Handheld ECG analyzer measuring millivolt-level cardiac signals with low-noise front-end. IC Role / Device Role / Timing Role: Low-noise, low-power ADC capturing differential biopotential waveforms with programmable gain staging. Use Value: 4.5MHz input bandwidth preserves QRS complex fidelity; 70dB SINAD ensures diagnostic-grade signal integrity at 133ksps. |
Use Scenario: Field-deployable multimeter performing simultaneous voltage, current, and resistance measurements. IC Role / Device Role / Timing Role: General-purpose 12-bit ADC handling diverse input ranges via software configuration and internal reference trimming. Use Value: REFADJ-adjustable reference enables factory calibration to ±0.1% full-scale; 20-pin PDIP facilitates manual rework and repair in service centers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit, 200ksps, SPI-only interface, no internal reference, requires external 2.5V ref, 3.3V-only supply | Better speed but lacks bipolar input support and internal reference - demands additional voltage references and level-shifting for 5V systems | Select when higher throughput is critical and system already uses 3.3V rails and precision external references. |
| AD7892BRZ | 12-bit, 600ksps, parallel + SPI interface, internal 2.5V ref, ±5V supply compatible, no multiplexer | Faster and includes parallel interface, but lacks on-chip MUX - requires external analog switching for multi-channel use | Choose for high-speed single-channel applications where parallel bus access reduces MCU overhead and layout space permits discrete MUX. |
Compared with MAX186DEPP, ADS7822U trades integrated reference and bipolar capability for higher speed and lower voltage operation, while AD7892BRZ offers faster conversion and dual-interface flexibility at the cost of channel count and on-chip signal routing - all three require distinct PCB layout strategies due to differing pinouts and supply schemes.
Availability
MAX186DEPP is available at Aetrix Electronics and suitable for portable instrumentation, industrial data-acquisition systems, and battery-powered medical devices requiring stable component supply, long-term manufacturability, and RoHS-compliant through-hole packaging.
Supply support for MAX186DEPP 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 MAX186 series belongs to Maxim's precision data-acquisition product line, designed specifically for low-power, multi-channel 12-bit ADC applications where integration of MUX, T/H, reference, and serial interface reduces system component count and improves measurement repeatability.
FAQ
What is the maximum sampling rate achievable with MAX186DEPP?
The MAX186DEPP achieves a maximum sampling rate of 133ksps under specified conditions: external 2.0MHz clock, 15 clock cycles per conversion, and unipolar single-ended operation. This rate assumes optimal acquisition time (1.5µs) and stable reference; actual sustained throughput may be lower in bipolar or differential modes due to increased settling requirements. The MAX186DEPP datasheet confirms this value in the ELECTRICAL CHARACTERISTICS table under "CONVERSION RATE".
Does MAX186DEPP include an internal voltage reference?
Yes, the MAX186DEPP integrates a precision 4.096V internal reference with ±30ppm/°C temperature coefficient and 4.076V to 4.116V tolerance at +25°C. This reference feeds the ADC core and is accessible at the VREF pin. Unlike the MAX188, the MAX186DEPP does not require an external reference, simplifying design for cost-sensitive and space-constrained applications.
What power-down modes does MAX186DEPP support?
The MAX186DEPP supports three software-selectable power-down modes controlled by bits PD1/PD0 in the command byte: full power-down (2µA supply current), fast power-down (30µA), and internal clock mode (active conversion ready). These modes allow dynamic power scaling - for example, using full power-down between conversions cuts average current to <10µA at low sampling rates, extending battery life significantly.
Can MAX186DEPP interface directly with a TMS320 DSP family processor?
Yes, the MAX186DEPP's SSTRB serial strobe output is explicitly designed for direct connection to TI TMS320 family DSPs. In internal clock mode, SSTRB goes low at conversion start and high upon completion; in external clock mode, it pulses high for one clock period before the MSB appears on DOUT - providing precise hardware synchronization without additional logic or timers.
What is the analog input voltage range for MAX186DEPP in unipolar mode?
In unipolar mode with VSS = 0V, the MAX186DEPP accepts analog input voltages from 0V to VREF (4.096V typical). The device's absolute maximum ratings permit input pins to swing from VSS − 0.3V to VDD + 0.3V, but for guaranteed full-scale accuracy, inputs must stay within 50mV of the supply rails - i.e., 0V to +4.046V for reliable 12-bit conversion results.
MAX186DEPP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- 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:
- Internal
- Voltage - Supply, Analog:
- ±5V, 5V
- Voltage - Supply, Digital:
- ±5V, 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX186DEPP FAQ
1.How can I place an order for MAX186DEPP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX186DEPP 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 MAX186DEPP reliable?
The price and inventory of MAX186DEPP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX186DEPP is usually 5 days.
3.What payment methods are accepted for MAX186DEPP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX186DEPP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX186DEPP?
MAX186DEPP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX186DEPP 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 MAX186DEPP?
For technical support, including MAX186DEPP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX186DEPP requirements.
6.How does Aetrix verify that MAX186DEPP is sourced from the original manufacturer or authorized distributors?
All MAX186DEPP 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 MAX186DEPP meets industry standards.
7.What is the process for return or replacement of MAX186DEPP?
All MAX186DEPP units undergo pre-shipment inspection (PSI). If there is an issue with MAX186DEPP, 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 MAX186DEPP part is unused and in its original packaging.
Return procedure for MAX186DEPP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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