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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:4,632
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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 supply systems. It features single-ended or differential input configuration, 133ksps sampling rate, ±0.5 LSB INL (A-grade), and operates from +5V analog supply with independent VL pin for 2.7V–5.25V digital output logic levels - used in battery-powered medical instrumentation requiring low-power, high-accuracy signal digitization.
For engineers reviewing the MAX1203ACAP datasheet, MAX1203ACAP pinout, MAX1203ACAP application, or MAX1203ACAP equivalent, this page delivers verified technical context, real-world interface constraints (SPI/MICROWIRE/TMS320 compatibility), power-down behavior under variable sampling rates, and precise reference-buffer interaction with external 4.096V references - all critical for embedded data acquisition design validation.
Technical Context
The MAX1203ACAP implements successive-approximation architecture with integrated track/hold, supporting both internal clock (1.7MHz) and external clock (up to 2MHz) conversion modes. Its analog front-end accepts unipolar (0V to VREF) or bipolar (±VREF/2) inputs across eight single-ended or four pseudo-differential channels, with channel selection controlled via 3-bit address in an 8-bit SPI-compatible control byte.
Digital interface uses a 4-wire serial protocol (CS, SCLK, DIN, DOUT) with SSTRB strobe output synchronized to conversion start/finish. The VL pin decouples digital I/O voltage (2.7V–5.25V) from analog supply, enabling direct interfacing to 3V microcontrollers without level shifters - while SHDN supports hardware-triggered full (2μA) or fast (30μA) power-down between conversions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 0.024% of full-scale range for precision sensor digitization |
| Sampling Rate | 133ksps - enables real-time capture of signals up to ~66kHz using Nyquist criterion |
| INL (A-grade) | ±0.5 LSB - ensures monotonicity and <0.012% end-point linearity error over temperature |
| Analog Supply | +5V ±5% - compatible with standard analog rail; supports dual ±5V operation for bipolar input ranges |
| Digital I/O Voltage | VL = 2.7V to 5.25V - allows direct connection to 3V, 3.3V, or 5V logic without external translators |
| Power Consumption | 1.5mA operating / 2μA full power-down - enables ultra-low average current in duty-cycled battery systems |
| Reference Requirement | External 4.096V at REF pin - eliminates internal reference drift; supports precision gain calibration via REFADJ |
Pinout & Package
MAX1203ACAP is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, RoHS-compliant and lead-free per ordering suffix '+'.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Selectable as 8 single-ended or 4 pseudo-differential inputs; IN- must remain stable within ±0.1 LSB during conversion |
| VSS (Pin 9) | Negative Analog Supply | Accepts 0V (unipolar) or –5V ±5% (bipolar); sets common-mode baseline for analog inputs |
| SHDN (Pin 10) | Three-Level Shutdown Control | Low = full shutdown (2μA); open = external compensation mode; VDD = internal compensation mode |
| REF (Pin 11) | Reference Buffer Output / ADC Reference Input | Receives external 4.096V reference; internal buffer disabled when REFADJ = VDD |
| REFADJ (Pin 12) | Reference Buffer Gain Adjustment | Tie to VDD to disable buffer; adjust ±1.5% gain trim for external reference accuracy optimization |
| GND (Pin 13) | Analog Ground / IN- for Single-Ended Mode | Primary ground reference; serves as return path for CH0–CH7 in unipolar configurations |
| VL (Pin 14) | Digital Output Supply | Sets DOUT/SSTRB high-level voltage (2.7V–5.25V); isolates digital logic swing from analog rails |
| DOUT (Pin 15) | Serial Data Output | MSB-first, SCLK-falling-edge aligned; 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, SEL2–SEL0, 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; 40–60% duty cycle required |
| VDD (Pin 20) | Positive Analog Supply | +5V ±5%; powers analog core, track/hold, and reference buffer (when enabled) |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel multiplexer with track/hold | Enables rapid scanning of multiple sensors without external sample-hold circuitry; 1.5μs acquisition time minimizes inter-channel settling delay |
| Software-configurable unipolar/bipolar mode | Single control bit (UNI/BIP) selects full-scale range: 0–VREF or ±VREF/2 - simplifies firmware handling of diverse transducer outputs |
| Reference-buffer amplifier with REFADJ | Allows ±1.5% fine-tuning of external reference gain (1.64×), compensating for resistor tolerance and PCB trace losses |
| Two power-down modes (fast/full) | Reduces supply current to 30μA or 2μA between conversions - extends battery life in intermittent-sampling applications |
| SPI/MICROWIRE/TMS320-compatible interface | Eliminates glue logic for TI C2000, STM32, or Renesas RL78; requires only CPOL=0, CPHA=0 configuration |
Applications
| Portable ECG Monitor | Industrial Process Sensor Hub |
|---|---|
Use Scenario: Digitizing low-amplitude biopotential signals (0.5–5mV) from dry-electrode ECG leads in handheld diagnostic devices. IC Role / Device Role / Timing Role: Primary ADC capturing 12-bit waveform data at 125–250Hz with <0.5 LSB INL to preserve ST-segment morphology. Use Value: VL pin set to 3.3V enables direct connection to ARM Cortex-M0+ MCU GPIOs; 2μA shutdown current extends AA-battery runtime to >12 months. |
Use Scenario: Simultaneous acquisition of 4–8 analog process variables (temperature, pressure, flow) in PLC remote I/O modules. IC Role / Device Role / Timing Role: High-accuracy front-end ADC supporting both unipolar 4–20mA loop outputs and bipolar thermocouple inputs via software-selectable mode. Use Value: External 4.096V reference + REFADJ trim achieves <±0.1% system gain error; ±5V dual supply supports industrial-grade noise immunity. |
| Battery-Powered Environmental Logger | Medical Infusion Pump Feedback Loop |
Use Scenario: Long-term logging of ambient temperature, humidity, and CO₂ using MEMS sensors with microamp-level quiescent current budgets. IC Role / Device Role / Timing Role: Low-power ADC triggered every 10 seconds; powered down between samples to minimize average current draw. Use Value: Full power-down mode draws only 2μA at +70°C - reduces total system sleep current below 5μA, enabling 5-year coin-cell operation. |
Use Scenario: Closed-loop monitoring of motor current and syringe position in Class II infusion pumps requiring IEC 60601-1 compliance. IC Role / Device Role / Timing Role: Safety-critical ADC providing redundant current sensing with <±0.5 LSB INL to detect occlusion or free-flow conditions. Use Value: Bipolar input mode captures bidirectional motor current; SSTRB strobe synchronizes sampling to PWM switching edges for accurate ripple rejection. |
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 | 8-channel, 12-bit, SPI interface; 200ksps max; internal reference only; no VL pin - fixed 3V I/O | Lacks external reference support and programmable digital voltage; unsuitable where reference trimming or mixed-voltage I/O is required | Choose ADS7822U only if internal reference suffices and system uses uniform 3V logic throughout |
| MAX11131ETE+ | 8-channel, 12-bit, SPI; 500ksps; internal 2.048V ref; VL pin supported; 10μA shutdown | Higher speed but lower DC accuracy (±1 LSB INL); smaller 16-pin TQFN package; no bipolar input mode | Select MAX11131ETE+ when sampling rate >200ksps is needed and bipolar inputs are unnecessary |
Compared with MAX1203ACAP, ADS7822U offers higher throughput but sacrifices reference flexibility and I/O voltage independence, while MAX11131ETE+ trades DC precision and bipolar capability for speed and compact packaging - making MAX1203ACAP optimal for calibrated, low-power, mixed-supply measurement systems.
Availability
MAX1203ACAP is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial sensor hubs, and battery-powered environmental loggers requiring stable component supply across extended product lifecycles.
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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and communications applications.
The MAX1202/MAX1203 family targets mixed-voltage data acquisition systems needing 12-bit accuracy, low power, and seamless 3V/5V interoperability - especially where external reference control and flexible power management are essential.
FAQ
What is the reference voltage requirement for MAX1203ACAP?
The MAX1203ACAP requires an external 4.096V reference applied to the REF pin. Unlike the MAX1202, it does not include an internal reference. The reference-buffer amplifier can be disabled by pulling REFADJ to VDD, and gain trim is supported via REFADJ adjustment (±1.5%). This configuration ensures high-precision, temperature-stable conversions in calibrated systems using MAX1203ACAP.
How does the VL pin affect MAX1203ACAP digital outputs?
The VL pin sets the high-level voltage for DOUT and SSTRB outputs, accepting 2.7V to 5.25V. When VL = 3.3V, MAX1203ACAP drives 3V logic directly without level shifters; at VL = 5V, it interfaces with 5V CMOS. Output voltage levels scale accordingly: VOH ≈ VL − 0.5V, VOL ≤ 0.4V. This flexibility makes MAX1203ACAP ideal for heterogeneous voltage-domain systems.
Can MAX1203ACAP operate in bipolar input mode?
Yes, MAX1203ACAP supports bipolar input mode via the UNI/BIP control bit. With VSS = −5V and external 4.096V reference, it accepts ±2.048V differential inputs. In pseudo-differential mode, channel pairs (e.g., CH0/CH1) are selected, and IN− must remain stable within ±0.1 LSB relative to GND. This capability enables accurate thermocouple or bridge-sensor measurements using MAX1203ACAP.
What are the power-down modes available on MAX1203ACAP?
MAX1203ACAP provides two software-selectable power-down modes via PD1/PD0 bits: fast power-down (30μA) and full power-down (2μA). Both modes retain register state and allow immediate wake-up on CS assertion. Hardware shutdown is also available via the SHDN pin. These modes let designers optimize average current in duty-cycled applications - critical for extending battery life in devices using MAX1203ACAP.
Is MAX1203ACAP compatible with SPI microcontrollers?
Yes, MAX1203ACAP is fully SPI-compatible with CPOL = 0 and CPHA = 0 configuration. It uses a 4-wire interface (CS, SCLK, DIN, DOUT) and supports 2MHz clock rates. The SSTRB strobe output aligns with conversion timing, simplifying synchronization with TMS320 or ARM-based controllers. No external logic is needed - enabling plug-and-play integration in systems deploying MAX1203ACAP.
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:
- 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:
- 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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