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Analog Devices Inc./Maxim Integrated MAX1203BCAP+
- Part No.:
- MAX1203BCAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1203BCAP+.pdf
- Description:
- IC ADC 12BIT 8CH 20-SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,388
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Product details
Overview
The MAX1203BCAP+ 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 operates from single +5V or dual ±5V analog supplies, integrates an internal track/hold amplifier, supports unipolar/bipolar and single-ended/differential input configurations, and delivers 133ksps sampling rate with ±1 LSB INL at 0°C to +70°C. It is used in battery-powered instrumentation requiring low-power, high-accuracy data acquisition.
For engineers reviewing the MAX1203BCAP+ datasheet, MAX1203BCAP+ pinout, MAX1203BCAP+ application, or MAX1203BCAP+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support for industrial and medical embedded designs.
Technical Context
The MAX1203BCAP+ uses successive-approximation architecture with integrated track/hold and flexible serial interface. It accepts external reference voltage (4.096V typical), supports software-configurable input modes (unipolar/bipolar, single-ended/differential), and features dual clocking-internal (1.7MHz) or external (up to 2MHz)-with 15-clock conversion cycles.
Its reference-buffer amplifier is disabled by pulling REFADJ to VDD, and its digital I/O levels are user-adjustable via VL (2.7V–5.25V). Power management includes two software-selectable power-down modes (fast: 30µA; full: 2µA), with automatic wake-up on serial interface access and turn-on time enabling per-conversion shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization |
| Sampling Rate | 133ksps - enables real-time capture of signals up to ~66kHz (Nyquist-limited) |
| INL (Integral Nonlinearity) | ±1 LSB - ensures monotonicity and <0.024% full-scale error across temperature |
| Analog Input Channels | 8 single-ended or 4 differential - supports multiplexed sensor arrays without external MUX |
| Supply Voltage Range | +5V ±5% analog, -5V/0V negative rail, VL = 2.7V–5.25V - enables direct interfacing to 3V/3.3V/5V logic domains |
| Power Consumption | 1.5mA operating, 2µA full power-down - extends battery life in portable instruments |
| Serial Interface | SPI/MICROWIRE/TMS320-compatible 4-wire - connects directly to microcontrollers without level shifters or glue logic |
Pinout & Package
MAX1203BCAP+ is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm pitch, RoHS-compliant and lead-free (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Selectable as 8 single-ended inputs or 4 differential pairs (CH0/CH1, CH2/CH3, etc.) |
| VSS (Pin 9) | Negative analog supply | Accepts 0V (single-supply) or -5V ±5% (bipolar operation) |
| SHDN (Pin 10) | Three-level shutdown control | Pull low → 10µA shutdown; leave open → external compensation mode; tie to VDD → internal compensation |
| 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 reference buffer; otherwise enables ±1.5% fine-tuning of reference gain |
| GND (Pin 13) | Analog ground / IN- for single-ended mode | Common return for analog circuitry and serves as reference for single-ended conversions |
| VL (Pin 14) | Digital output supply | Sets DOUT/SSTRB logic-high level (2.7V–5.25V); enables safe interfacing with 3V/3.3V/5V controllers |
| DOUT (Pin 15) | Serial data output | MSB-first 12-bit result clocked on SCLK falling edge; 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/end timing |
| DIN (Pin 17) | Serial data input | Accepts 8-bit control byte (channel, mode, power-down) on SCLK rising edge |
| CS (Pin 18) | Active-low chip select | Enables serial interface; DOUT/SSTRB enter high-Z state when CS = high |
| SCLK (Pin 19) | Serial clock input | Drives data transfer and (in external mode) controls conversion timing; 0.1–2.0MHz range |
| VDD (Pin 20) | Positive analog supply | +5V ±5% main supply; powers analog core, track/hold, and internal logic |
Key Features
| Feature | Design Value |
|---|---|
| User-adjustable digital output voltage | VL pin sets DOUT/SSTRB swing from 2.7V to 5.25V - eliminates need for external level translators with 3V µCs |
| Software-configurable input modes | Control byte selects unipolar/bipolar and single-ended/differential - enables dynamic reconfiguration without hardware change |
| Two-tier power-down architecture | Fast (30µA) and full (2µA) modes - allows adaptive current scaling between conversions to minimize average power |
| Internal track/hold with 1.5µs acquisition | Eliminates external T/H circuitry; supports source impedances ≤1kΩ without performance degradation |
| Reference-buffer amplifier disable | REFADJ tied to VDD disables internal buffer - ensures stable 4.096V external reference path with minimal drift |
| SPI/MICROWIRE/TMS320 compatibility | No external logic required - direct connection to TI C2000, STM32, or Renesas RL78 serial peripherals |
Applications
| Battery-Powered Data Loggers | Medical Patient Monitoring Systems |
|---|---|
Use Scenario: Continuous acquisition of ECG, SpO₂, and temperature sensor outputs in handheld diagnostic devices. IC Role / Device Role / Timing Role: Primary 12-bit ADC handling multi-channel analog front-end digitization with configurable input ranges and low quiescent current. Use Value: 2µA full power-down mode extends battery life; 3V-compatible digital interface simplifies integration with ultra-low-power MCUs. |
Use Scenario: High-accuracy analog signal conditioning in portable ultrasound or infusion pump controllers. IC Role / Device Role / Timing Role: Precision ADC for sensor feedback loops requiring ±1 LSB linearity and bipolar input support. Use Value: ±1 LSB INL and 70dB SINAD ensure clinical-grade measurement fidelity; dual ±5V supply enables true bipolar signal capture. |
| Industrial Process Control Sensors | Automotive Diagnostic Tools |
Use Scenario: Multi-point temperature, pressure, and current sensing in PLC analog input modules. IC Role / Device Role / Timing Role: Channel-multiplexed ADC providing isolated analog input digitization with software-selectable gain and offset calibration. Use Value: Channel-to-channel offset matching (±0.1 LSB) ensures consistent readings across all 8 inputs; robust ±5V supply tolerance suits harsh environments. |
Use Scenario: Portable OBD-II scanners capturing analog signals from vehicle sensors (TPS, MAP, coolant temp). IC Role / Device Role / Timing Role: Mixed-voltage ADC bridging 5V automotive sensor outputs and 3.3V ARM-based host processors. Use Value: VL pin enables direct 3.3V logic interfacing; 133ksps sampling captures transient engine events without aliasing. |
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 T/H, requires external reference buffer | Lacks integrated track/hold and software-configurable bipolar mode; higher speed but less system integration | Choose when maximum throughput >133ksps is critical and external T/H is acceptable |
| MAX11131ETE+ | 12-bit, 500ksps, internal reference, 10-pin µMAX, no differential input support | Smaller package and higher speed, but only single-ended inputs and fixed 4.096V reference | Choose for space-constrained 8-channel single-ended designs where differential capability is unnecessary |
Compared with ADS7822U and MAX11131ETE+, the MAX1203BCAP+ uniquely combines integrated track/hold, software-selectable differential/unipolar/bipolar modes, and VL-adjustable logic levels - making it optimal for mixed-supply, multi-sensor embedded systems where board area, power, and interface flexibility are jointly constrained.
Availability
MAX1203BCAP+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, medical patient monitors, industrial process controllers, and automotive diagnostic tools requiring stable component supply and long-term production continuity.
Supply support for MAX1203BCAP+ 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 product line was designed for precision, low-power, mixed-voltage data acquisition in portable and embedded systems - emphasizing seamless 3V/5V interoperability, integrated signal conditioning, and flexible serial interfacing.
FAQ
What is the reference voltage requirement for MAX1203BCAP+?
The MAX1203BCAP+ requires an external reference voltage applied to the REF pin, typically 4.096V. Unlike the MAX1202, it does not include an internal reference. The reference-buffer amplifier must be disabled by tying REFADJ to VDD to ensure accurate external reference operation. The device specifies ±1.5 LSB gain error with a 4.096V reference and supports input voltages from 2.50V to VDD + 50mV at the REF pin.
Does MAX1203BCAP+ support differential input mode?
Yes, the MAX1203BCAP+ supports pseudo-differential input mode using channel pairs (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7), selectable via the SGL/DIF bit in the control byte. In this mode, only the positive input (IN+) is sampled, while the negative input (IN−) must remain stable within ±0.1 LSB. A 0.1µF capacitor from IN− to GND is recommended to maintain stability during conversion.
What are the power-down modes available on MAX1203BCAP+?
The MAX1203BCAP+ offers two software-selectable power-down modes controlled by PD1/PD0 bits in the control byte: fast power-down (30µA typical) and full power-down (2µA typical). Both modes retain register state and allow immediate wake-up via serial interface access. Full power-down reduces supply current below 10µA at reduced sampling rates, optimizing energy use in intermittent acquisition systems.
Can MAX1203BCAP+ interface directly with a 3.3V microcontroller?
Yes, the MAX1203BCAP+ interfaces directly with 3.3V microcontrollers via its VL pin, which sets digital output levels (DOUT and SSTRB) to match the host logic supply. With VL = 3.3V, outputs swing from 0V to 2.8V (VOH ≥ VL − 0.5V), meeting 3.3V logic thresholds. Its digital inputs (DIN, SCLK, CS, SHDN) accept 0.8V/2.0V thresholds compatible with both 3.3V and 5V CMOS.
What is the maximum sampling rate of MAX1203BCAP+ and how is it achieved?
The MAX1203BCAP+ achieves a maximum sampling rate of 133ksps using an external 2.0MHz SCLK in external clock mode with 15 clocks per conversion cycle. Conversion time is fixed at 7.5µs (15 × 500ns), and the track/hold acquisition time is guaranteed at 1.5µs. This rate is maintained across the full 0°C to +70°C commercial temperature range and supports continuous high-fidelity waveform capture.
MAX1203BCAP+ 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:
- -
MAX1203BCAP+ FAQ
1.How can I place an order for MAX1203BCAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1203BCAP+ 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 MAX1203BCAP+ reliable?
The price and inventory of MAX1203BCAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1203BCAP+ is usually 5 days.
3.What payment methods are accepted for MAX1203BCAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1203BCAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1203BCAP+?
MAX1203BCAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1203BCAP+ 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 MAX1203BCAP+?
For technical support, including MAX1203BCAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1203BCAP+ requirements.
6.How does Aetrix verify that MAX1203BCAP+ is sourced from the original manufacturer or authorized distributors?
All MAX1203BCAP+ 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 MAX1203BCAP+ meets industry standards.
7.What is the process for return or replacement of MAX1203BCAP+?
All MAX1203BCAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1203BCAP+, 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 MAX1203BCAP+ part is unused and in its original packaging.
Return procedure for MAX1203BCAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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