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Analog Devices Inc./Maxim Integrated MAX1203ACAP+
- Part No.:
- MAX1203ACAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1203ACAP+.pdf
- Description:
- IC ADC 12BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,001
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Product details
Overview
MAX1203ACAP+ from Maxim Integrated is a 12-bit, 8-channel serial analog-to-digital converter (ADC) designed for mixed 5V analog / 3V digital systems. It operates from single +5V or dual ±5V analog supplies, features an integrated track/hold, 4-wire SPI/MICROWIRE-compatible interface, 133ksps sampling rate, and requires an external reference voltage. It is used in battery-powered instrumentation where low-power operation and flexible logic-level interfacing are critical.
For engineers reviewing the MAX1203ACAP+ datasheet, MAX1203ACAP+ pinout, MAX1203ACAP+ application, or MAX1203ACAP+ equivalent, key selection considerations include its external-reference dependency, software-configurable unipolar/bipolar input mode, 20-pin SSOP package with VL-controlled 2.7–5.25V digital output swing, and shutdown current below 10μA at reduced sampling rates.
Technical Context
The MAX1203ACAP+ implements successive-approximation architecture with an internal track/hold circuit enabling 1.5μs acquisition time and 133ksps conversion rate using a 2MHz external clock. Its analog front-end supports 8-channel single-ended or 4-channel differential inputs with channel-to-channel offset matching of ±0.1 LSB and crosstalk of –85dB at 65kHz.
Digital interface compliance includes SPI Mode 0 (CPOL=0, CPHA=0) and MICROWIRE protocols; SSTRB strobe output enables direct TMS320-family DSP synchronization. The VL pin decouples digital I/O voltage (2.7–5.25V) from analog supply, allowing seamless interfacing with 3V microcontrollers while maintaining 5V analog performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 part in 4096 quantization granularity for high-fidelity signal digitization. |
| Sampling Rate | 133ksps - supports real-time capture of signals up to ~66kHz via Nyquist criterion. |
| INL (Max) | ±0.5 LSB (A-grade) - ensures monotonicity and <0.012% full-scale linearity error across temperature. |
| Power (Operating) | 1.5mA @ +5V - enables <7.5mW analog power draw, suitable for portable designs. |
| Power (Shutdown) | 2–10μA - allows aggressive duty-cycling between conversions to extend battery life. |
| Digital I/O Voltage Range | 2.7V to 5.25V (via VL pin) - eliminates level-shifter requirements when interfacing with 3V or 3.3V controllers. |
| Analog Input Config | 8 SE or 4 diff channels - provides flexible sensor multiplexing without external MUX hardware. |
Pinout & Package
MAX1203ACAP+ is housed in a 20-pin shrink small-outline package (SSOP), 0.65mm pitch, with exposed pad not electrically connected. Thermal resistance θJA = 125°C/W; derating is 8.00mW/°C above +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Selectable as 8 single-ended or 4 differential inputs; input range referenced to VSS/VDD (–5V to +5V). |
| VSS (Pin 9) | Negative analog supply | Accepts 0V (single-supply) or –5V ±5% (dual-supply); sets bipolar input common-mode baseline. |
| SHDN (Pin 10) | Three-state shutdown control | Pull low → 10μA shutdown; leave open → external REFADJ compensation; pull high → internal compensation. |
| REF (Pin 11) | Reference buffer output / ADC reference input | Receives external 4.096V reference; internal buffer disabled by pulling REFADJ to VDD. |
| REFADJ (Pin 12) | Reference buffer gain adjust | Tie to VDD to disable internal reference buffer; otherwise enables ±1.5% trim of buffered reference. |
| GND (Pin 13) | Analog ground / IN– for SE mode | Common return for analog circuitry; serves as single-ended input reference when VSS = 0V. |
| VL (Pin 14) | Digital output supply | Sets DOUT/SSTRB high-level voltage (2.7–5.25V); isolates digital logic swing from analog VDD. |
| DOUT (Pin 15) | Serial data output | MSB-first, SCLK-falling-edge synchronized; high-impedance when CS = high. |
| SSTRB (Pin 16) | Serial strobe output | Pulses high one SCLK period before MSB in external-clock mode; indicates conversion start/finish timing. |
| DIN (Pin 17) | Serial data input | Accepts 8-bit control byte (START, SELx, UNI/BIP, SGL/DIF, PD1/PD0) on SCLK rising edge. |
| CS (Pin 18) | Active-low chip select | Enables serial interface; DOUT enters high-Z state when CS = high. |
| SCLK (Pin 19) | Serial clock input | Drives data transfer and (in external mode) conversion timing; supports up to 2MHz, 40–60% duty cycle. |
| VDD (Pin 20) | Positive analog supply | +5V ±5%; powers analog core, track/hold, and reference buffer (when enabled). |
Key Features
| Feature | Design Value |
|---|---|
| External reference architecture | Requires externally applied 4.096V at REF pin; enables precision system-level reference sourcing and trimming. |
| Software-selectable input mode | Control byte bits UNI/BIP and SGL/DIF configure unipolar (0–VREF) or bipolar (±VREF/2) and single-ended/differential operation. |
| Three power-down states | Full power-down (2μA), fast power-down (30μA), and internal clock mode enable dynamic current optimization per conversion cycle. |
| Flexible digital I/O voltage | VL pin sets DOUT/SSTRB logic-high level independently of VDD, supporting direct connection to 3V, 3.3V, or 5V controllers. |
| Integrated track/hold with 4.5MHz BW | Eliminates need for external sample-hold; supports accurate digitization of transient signals and undersampling applications. |
Applications
| Battery-Powered Instrumentation | Medical Instrumentation |
|---|---|
Use Scenario: Portable ECG monitor acquiring biopotential signals from dry electrodes with limited battery capacity. IC Role / Device Role / Timing Role: 12-bit ADC digitizing amplified lead-II differential inputs at 125–250Hz with programmable gain and low-noise sampling. Use Value: 2μA shutdown current extends operating life; VL pin enables direct interface with 3.3V ARM Cortex-M MCU without level shifters. |
Use Scenario: Handheld blood glucose meter measuring amperometric sensor current through transimpedance amplifier. IC Role / Device Role / Timing Role: High-accuracy ADC converting analog sensor output with <±0.5 LSB INL to ensure clinical-grade measurement repeatability. Use Value: Channel-to-channel offset matching (±0.1 LSB) supports ratiometric calibration against reference electrode; 133ksps allows oversampling for noise reduction. |
| High-Accuracy Process Control | 5V/3V Mixed-Supply Industrial Data Acquisition |
Use Scenario: PLC analog input module conditioning 4–20mA loop signals and thermocouple outputs in factory automation. IC Role / Device Role / Timing Role: Multiplexed ADC scanning 8 sensor channels with software-configurable unipolar/bipolar ranges and gain adjustment via REFADJ. Use Value: ±85dB crosstalk and –80dB THD support simultaneous multi-channel acquisition without inter-channel interference or harmonic distortion. |
Use Scenario: Embedded controller board integrating legacy 5V analog sensors with modern 3.3V FPGA or SoC. IC Role / Device Role / Timing Role: Bridge device providing 5V-tolerant analog front-end and 3.3V-compatible digital interface in single-chip solution. Use Value: Independent VL supply (2.7–5.25V) and 5V-tolerant DIN/SCLK/CS pins eliminate external voltage translators and reduce BOM count. |
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 SSTRB output; fixed 3V digital I/O; internal reference only. | Lacks VL pin flexibility and external reference option; unsuitable for systems requiring reference trimming or mixed-voltage I/O. | Choose ADS7822U only if internal reference suffices and 3V-only digital interface is acceptable. |
| MAX11607EEE+ | 12-bit, 94.4ksps, I²C interface; 8-channel SE/4-channel diff; internal reference; VL pin supported. | No SPI/MICROWIRE compatibility; lacks SSTRB for DSP sync; lower max sampling rate than MAX1203ACAP+. | Select MAX11607EEE+ when I²C bus availability and lower power (350μA active) outweigh need for high-speed SPI or TMS320 strobe support. |
Compared with ADS7822U and MAX11607EEE+, the MAX1203ACAP+ uniquely combines external reference support, VL-configurable digital outputs, SSTRB strobe for real-time DSP coordination, and 133ksps throughput-making it optimal for mixed-supply, low-power, high-precision embedded data acquisition where system-level reference control and timing determinism are essential.
Availability
MAX1203ACAP+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, medical diagnostics equipment, industrial process monitoring, and mixed 5V/3V embedded data acquisition systems requiring stable component supply and long-term manufacturability.
Supply support for MAX1203ACAP+ 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 MAX1202/MAX1203 family was engineered for precision, low-power, mixed-voltage data acquisition-targeting portable and embedded systems where 5V analog integrity must coexist with 3V digital logic without level-shifting overhead.
FAQ
What reference voltage does the MAX1203ACAP+ require?
The MAX1203ACAP+ requires an external 4.096V reference applied to the REF pin. Unlike the MAX1202 variant, it does not include an internal reference. The reference-buffer amplifier can be disabled by pulling REFADJ to VDD, and the device supports gain trimming via REFADJ when enabled. This external-reference architecture allows system-level calibration and improved accuracy over temperature.
Does the MAX1203ACAP+ support both unipolar and bipolar input modes?
Yes, the MAX1203ACAP+ supports both unipolar (0V to VREF) and bipolar (±VREF/2) input ranges. The mode is selected dynamically via the UNI/BIP bit (bit 3) in the 8-bit control byte sent to DIN. In bipolar mode with VSS = –5V and VREF = 4.096V, the input range becomes ±2.048V, enabling accurate measurement of AC-coupled or centered sensor signals without external signal conditioning.
How does the VL pin affect digital interface operation in the MAX1203ACAP+?
The VL pin on the MAX1203ACAP+ sets the high-level voltage for DOUT and SSTRB outputs, supporting 2.7V to 5.25V logic levels. This allows direct interfacing with 3V, 3.3V, or 5V microcontrollers without external level shifters. When VL = 3.3V, VOH ≥ 2.8V and VOL ≤ 0.4V under 3mA load-ensuring reliable communication with standard 3.3V CMOS receivers while maintaining full 5V analog performance.
What are the power-down modes available on the MAX1203ACAP+?
The MAX1203ACAP+ offers three software-selectable power states via PD1/PD0 bits in the control byte: full power-down (2–10μA), fast power-down (30–70μA), and active conversion modes (internal or external clock). Full power-down disables the reference buffer and analog core, ideal for extended idle periods; fast power-down retains reference bias for quicker wake-up. Power state transitions occur automatically on serial interface access.
Is the MAX1203ACAP+ compatible with SPI and MICROWIRE interfaces?
Yes, the MAX1203ACAP+ is fully compatible with both SPI (Mode 0: CPOL = 0, CPHA = 0) and MICROWIRE protocols. It uses a 4-wire serial interface (DIN, DOUT, SCLK, CS) with MSB-first, SCLK-falling-edge data output and SCLK-rising-edge data input. No external logic is required for connection to SPI/MICROWIRE controllers, and the SSTRB output provides additional timing visibility for synchronous systems like TMS320 DSPs.
MAX1203ACAP+ 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:
- Active
- 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:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1203ACAP+ FAQ
1.How can I place an order for MAX1203ACAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1203ACAP+ 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 MAX1203ACAP+ reliable?
The price and inventory of MAX1203ACAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1203ACAP+ is usually 5 days.
3.What payment methods are accepted for MAX1203ACAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1203ACAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1203ACAP+?
MAX1203ACAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1203ACAP+ 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 MAX1203ACAP+?
For technical support, including MAX1203ACAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1203ACAP+ requirements.
6.How does Aetrix verify that MAX1203ACAP+ is sourced from the original manufacturer or authorized distributors?
All MAX1203ACAP+ 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 MAX1203ACAP+ meets industry standards.
7.What is the process for return or replacement of MAX1203ACAP+?
All MAX1203ACAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1203ACAP+, 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 MAX1203ACAP+ part is unused and in its original packaging.
Return procedure for MAX1203ACAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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