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Analog Devices Inc./Maxim Integrated MAX188BEWP
- Part No.:
- MAX188BEWP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX188BEWP.pdf
- Description:
- IC ADC 12BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,092
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Product details
Overview
MAX188BEWP from Maxim Integrated is a 12-bit, 8-channel serial analog-to-digital converter (ADC) with software-configurable unipolar/bipolar and single-ended/differential inputs, internal track/hold, SPI/QSPI/MICROWIRE-compatible 4-wire interface, and ultra-low 1.5mA operating current - used in portable data loggers and battery-powered medical instruments requiring precision sampling at up to 133ksps.
For engineers reviewing the MAX188BEWP datasheet, MAX188BEWP pinout, MAX188BEWP application, or MAX188BEWP equivalent, this page delivers verified electrical parameters, package mapping to 20-pin SSOP, confirmed shutdown behavior (10µA full power-down), reference architecture (external 4.096V VREF), and real-world timing constraints including 1.5µs acquisition time and 6µs conversion time with 2MHz external clock.
Technical Context
The MAX188BEWP implements successive-approximation (SAR) conversion with an integrated track/hold circuit and 8-channel analog multiplexer. It supports both internal clock mode (1.7–10MHz) and external clock mode (up to 4MHz), with SSTRB strobe output synchronized to conversion start/end for TMS320 DSP interfacing.
Its analog input architecture enables pseudo-differential operation across four channel pairs (CH0/CH1, CH2/CH3, etc.), with IN− stability requirement of ±0.5LSB relative to AGND during conversion. The reference buffer is disabled by connecting REFADJ to VDD, and VREF accepts externally supplied 4.096V for precise scaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB = 0.024% of full-scale range, enabling 4096 discrete steps per conversion. |
| Sampling Rate | 133ksps maximum - achieved with 2MHz external clock and 15-clock conversion cycle, suitable for transient capture in industrial monitoring. |
| Analog Input Channels | 8 single-ended or 4 differential - configurable via control byte bits SEL2–SEL0 and SGL/DIF, supporting flexible sensor multiplexing. |
| Power Consumption | 1.5mA operating / 2µA full power-down - enables duty-cycled operation in battery-powered systems with sub-10µA average current at low sample rates. |
| Reference Architecture | External 4.096V reference required at VREF pin - eliminates internal reference drift; REFADJ adjusts gain scaling factor (1.638×) when enabled. |
| Serial Interface | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire - no level-shifting logic needed; DOUT active on SCLK falling edge, CS-active-low protocol. |
| Acquisition Time | 1.5µs minimum - defines shortest interval between control-byte latch and valid sample hold; critical for high-impedance source interfacing. |
Pinout & Package
MAX188BEWP is housed in a 20-pin shrink small-outline package (SSOP), RoHS-compliant and lead-free, occupying 30% less PCB area than standard 8-pin PDIP. Pin pitch is 0.65mm; body dimensions are 7.2mm × 5.3mm × 1.95mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Selectable as single-ended (vs. AGND) or differential pairs; input protection clamps to VDD/VSS ±0.3V. |
| VSS (Pin 9) | Negative supply rail | Accepts 0V (unipolar) or –5V ±5% (bipolar); sets common-mode range from VSS to VDD for all analog inputs. |
| SHDN (Pin 10) | Three-level shutdown control | Low = 10µA shutdown; high = internal compensation mode; open = external compensation mode. |
| VREF (Pin 11) | Reference voltage input/output | Accepts external 4.096V reference; outputs buffered reference (1.638×REFADJ) when REFADJ is active. |
| REFADJ (Pin 12) | Reference buffer gain adjust | Connect to VDD to disable buffer; otherwise sets VREF output magnitude; ±1.5% adjustment range. |
| AGND (Pin 13) | Analog ground reference | Return for analog inputs and internal T/H; must be separated from DGND to minimize digital noise coupling. |
| DGND (Pin 14) | Digital ground reference | Return for serial interface and logic; tied to AGND at single point near device to avoid ground loops. |
| DOUT (Pin 15) | Serial data output | 3-state, MSB-first, clocked on SCLK falling edge; high-impedance when CS is high. |
| SSTRB (Pin 16) | Serial strobe output | Pulses high before MSB in external clock mode; goes low at conversion start and high at completion in internal clock mode. |
| DIN (Pin 17) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; first "1" bit after CS fall defines MSB position. |
| CS (Pin 18) | Chip select | Active-low enable for serial interface; disables DOUT/SSTRB when high; required for every conversion sequence. |
| SCLK (Pin 19) | Serial clock input | Drives data transfer and (in external mode) conversion timing; 40–60% duty cycle required; max 4MHz in external mode. |
| VDD (Pin 20) | Positive supply rail | +5V ±5%; powers analog and digital sections; decoupling capacitor required within 1cm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input modes | Unipolar/bipolar and single-ended/differential selection via control byte - eliminates external signal conditioning for multi-sensor platforms. |
| Ultra-low power shutdown | 2µA full power-down current - enables microcontroller-controlled wake-on-event sampling without external load switches. |
| Integrated track/hold | 1.5µs acquisition time with no external hold capacitor - reduces BOM count and layout sensitivity for high-impedance sensors. |
| Flexible serial interface | SPI/QSPI/MICROWIRE/TMS320 compatibility with no glue logic - simplifies integration into existing DSP or MCU firmware stacks. |
| External reference support | VREF pin accepts precision 4.096V source - allows system-level calibration traceability and eliminates internal reference temperature drift. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over 72-hour intervals. IC Role / Device Role / Timing Role: ADC front-end acquiring 8 analog sensor outputs sequentially at 10ksps with automatic power-down between samples. Use Value: 1.5mA operating current and 2µA shutdown extend coin-cell life beyond 1 year; 12-bit resolution captures sub-0.1°C thermal gradients. |
Use Scenario: Handheld ECG monitor digitizing lead-II differential signals with programmable gain and baseline correction. IC Role / Device Role / Timing Role: Precision analog front-end converting filtered biopotential signals using CH0/CH1 differential pair and bipolar input mode. Use Value: ±0.5LSB offset matching across channels ensures accurate R-wave amplitude comparison; 133ksps supports Nyquist sampling of 50kHz harmonics. |
| Industrial Process Control | Automated Test Equipment |
Use Scenario: PLC I/O module measuring 4–20mA current loop outputs from flow, level, and pressure transmitters. IC Role / Device Role / Timing Role: Multiplexed ADC scanning 8 isolated current-loop receivers with software-selected unipolar 0–5V range and 12-bit linearity. Use Value: ±1.0LSB relative accuracy and ±0.75LSB DNL guarantee <0.025% total error over 0–70°C; REFADJ enables field calibration against master reference. |
Use Scenario: Benchtop multimeter performing rapid DC voltage measurements across 12 ranges with auto-ranging and nulling. IC Role / Device Role / Timing Role: High-speed acquisition engine capturing 12-bit samples at 133ksps, feeding FPGA-based digital filtering and statistical analysis. Use Value: 70dB SINAD and 80dB SFDR ensure >6.5 ENOB for precision metrology; SSTRB strobe synchronizes FPGA capture window to conversion completion. |
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 | 2.7–5.25V supply range; 1MSPS max rate; internal reference only; SPI-only interface; no SHDN pin. | Better suited for wide-input-voltage embedded systems but lacks bipolar mode and external reference flexibility. | Choose ADS7822U when single-supply operation below 5V and higher speed are prioritized over reference control and shutdown granularity. |
| MAX11131ETE+ | 12-bit, 1MSPS, internal reference, SPI interface, 1.8–3.6V supply; no differential input support; 10-pin µMAX package. | Targeted at space-constrained, low-voltage IoT nodes - missing 8-channel mux, bipolar mode, and external reference capability. | Choose MAX11131ETE+ for compact, low-power sensor hubs where channel count and analog flexibility are secondary to size and voltage compatibility. |
Compared with ADS7822U and MAX11131ETE+, the MAX188BEWP uniquely combines 8-channel multiplexing, external reference support, bipolar/differential configuration, and three-level shutdown - making it the only option among the three qualified for precision, multi-sensor, battery-operated instrumentation requiring field-calibratable full-scale range.
Availability
MAX188BEWP is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and industrial process control requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long-term production continuity.
Supply support for MAX188BEWP 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/MAX188 product line was designed for low-power, high-accuracy data acquisition in portable and remote sensing systems - emphasizing integration of multiplexer, track/hold, and serial interface in a single 20-pin package.
FAQ
What is the reference voltage requirement for MAX188BEWP?
The MAX188BEWP requires an external 4.096V reference applied to the VREF pin. Unlike the MAX186, it does not include an internal reference. The REFADJ pin allows gain scaling (1.638×) when enabled, or can be tied to VDD to disable the reference buffer. A 4.7µF capacitor is required at VREF for external compensation mode to ensure stability during conversion.
Does MAX188BEWP support differential input mode?
Yes, the MAX188BEWP supports pseudo-differential input mode across four channel pairs: CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. In this mode, the voltage difference |IN+ − IN−| is sampled, but IN− must remain stable within ±0.5LSB relative to AGND during conversion. A 0.1µF capacitor from the selected IN− channel to AGND is recommended to maintain stability.
What are the power-down modes available on MAX188BEWP?
The MAX188BEWP offers three power-down states controlled via the SHDN pin and control-byte bits PD1/PD0: full power-down (2µA), fast power-down (30µA), and internal clock mode (1.5mA). Pulling SHDN low activates full power-down; leaving it open configures external compensation; pulling it high selects internal compensation. Power-up occurs automatically upon CS assertion.
Can MAX188BEWP interface directly with TMS320 DSPs?
Yes, the MAX188BEWP's SSTRB serial strobe output is explicitly designed for direct connection to TMS320 family DSPs. In internal clock mode, SSTRB goes low at conversion start and high at 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.
What is the maximum sampling rate achievable with MAX188BEWP?
The MAX188BEWP achieves a maximum sampling rate of 133ksps using a 2MHz external clock and 15-clock conversion cycle. This rate assumes optimal timing margins and stable reference. At lower clock frequencies or with internal clock mode, the effective rate drops due to fixed conversion latency (≤10µs), but data can be read back asynchronously at up to 10MHz SCLK.
MAX188BEWP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- 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:
- External
- Voltage - Supply, Analog:
- ±5V, 5V
- Voltage - Supply, Digital:
- ±5V, 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX188BEWP FAQ
1.How can I place an order for MAX188BEWP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX188BEWP 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 MAX188BEWP reliable?
The price and inventory of MAX188BEWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX188BEWP is usually 5 days.
3.What payment methods are accepted for MAX188BEWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX188BEWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX188BEWP?
MAX188BEWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX188BEWP 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 MAX188BEWP?
For technical support, including MAX188BEWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX188BEWP requirements.
6.How does Aetrix verify that MAX188BEWP is sourced from the original manufacturer or authorized distributors?
All MAX188BEWP 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 MAX188BEWP meets industry standards.
7.What is the process for return or replacement of MAX188BEWP?
All MAX188BEWP units undergo pre-shipment inspection (PSI). If there is an issue with MAX188BEWP, 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 MAX188BEWP part is unused and in its original packaging.
Return procedure for MAX188BEWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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