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Analog Devices Inc./Maxim Integrated MAX117CAI+
- Part No.:
- MAX117CAI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX117CAI+.pdf
- Description:
- IC ADC 8BIT FLASH 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,742
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Product details
Overview
MAX117CAI+ from Maxim Integrated is an 8-bit, 8-channel analog-to-digital converter (ADC) optimized for low-power, single-supply operation at +3.0V to +3.6V. It delivers 400ksps sampling rate with 1.8µs conversion time, ±1LSB total unadjusted error, and 1µA power-down current. It integrates an internal track/hold, ratiometric reference inputs, and supports microprocessor interface via parallel 8-bit bus without external logic.
For engineers reviewing the MAX117CAI+ datasheet, MAX117CAI+ pinout, MAX117CAI+ application, or MAX117CAI+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed use cases in battery-powered and remote sensing systems, and two rigorously cross-checked alternative parts.
Technical Context
The MAX117CAI+ employs a half-flash architecture with dual 4-bit flash ADC sections and an internal DAC to generate residue voltage-enabling full 8-bit resolution with only 15 comparators. Its analog multiplexer selects among eight input channels under A0–A2 address control, with IN8 hardwired to monitor REF+.
It operates in two digital interface modes: read mode (MODE = 0) using RD/CS for conversion initiation and RDY status, and write-read mode (MODE = 1) using WR to start conversion and INT to signal completion. Power-down is asserted by pulling PWRDN low, achieving sub-µA quiescent current and <900ns wake-up latency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes with binary coding and 1LSB = (REF+ − REF−)/256 |
| Sampling Rate | 400ksps - supports continuous acquisition at up to 400k samples per second in WR-RD mode |
| Total Unadjusted Error | ±1LSB - guarantees monotonicity and no missing codes across full operating temperature range (0°C to +70°C) |
| Conversion Time | 1.8µs - fixed latency per channel in WR-RD mode; enables deterministic timing in burst-mode data acquisition |
| Power-Down Current | 1µA typical - reduces system-level standby power in portable or energy-harvested sensor nodes |
| Supply Voltage | +3.0V to +3.6V - eliminates need for level-shifting when interfacing with 3.3V µPs or FPGAs |
| SINAD | 45dB at 30.273kHz input - corresponds to ~7.2 effective bits, suitable for medium-fidelity sensor digitization |
Pinout & Package
MAX117CAI+ is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.635mm pitch, JEDEC MS-012AC compliant, and rated for 0°C to +70°C industrial operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 24) | Positive supply input | Accepts +3.0V to +3.6V; requires 4.7µF + 0.1µF bypassing to GND for stable conversion performance |
| PWRDN (Pin 23) | Power-down enable | Logic-low assertion reduces VDD current to 1µA; must be driven to rail (not floating) to minimize leakage in shutdown |
| A0–A2 (Pins 22, 21, 20) | Multiplexer channel address inputs | Select one of eight analog inputs (IN1–IN7, IN8=REF+); latched on WR or RD edge depending on MODE |
| IN1–IN7 (Pins 1–4, 25–27) | Analog input channels | High-impedance inputs with 32pF capacitance; support source impedances ≤1.5kΩ without extended tACQ |
| IN8 / REF+ (Pin 14) | Internal reference monitor | Hardwired to REF+; reads full-scale reference voltage when selected-used for ratiometric calibration checks |
| REF+ (Pin 14), REF− (Pin 13) | Ratiometric reference span | Define zero-code (REF−) and full-scale (REF+) voltages; internal 1kΩ resistance between them draws current even in power-down |
| CS (Pin 16), RD (Pin 10), WR/RDY (Pin 15) | Digital interface control | Enable device selection (CS), initiate read cycle (RD), or start conversion/status (WR/RDY); three-state outputs drive 8-bit µP bus directly |
| D0–D7 (Pins 6–9, 17–20) | Parallel data outputs | Latched, three-state buffers; D0 = LSB, D7 = MSB; VOL ≤0.4V @ 400µA sink ensures TTL/CMOS compatibility |
| INT (Pin 11) | Interrupt output | Open-collector active-low signal indicating conversion completion; resets on rising edge of CS or RD |
| MODE (Pin 5) | Interface mode select | Internally pulled low (15µA); MODE = 0 → read mode (RD-driven), MODE = 1 → write-read mode (WR-initiated) |
Key Features
| Feature | Design Value |
|---|---|
| Single +3V supply operation | Eliminates dual-rail or LDO requirements-reduces BOM count and PCB area in 3.3V systems |
| Internal track/hold circuit | Enables accurate digitization of signals with >0.28V/µs slew rate without external sample-hold components |
| Ratiometric reference inputs | Allows direct connection to resistive sensors (e.g., RTDs, potentiometers) where REF+ tracks excitation voltage-rejects supply variation |
| 8-channel analog multiplexer | Reduces component count vs. multiple single-channel ADCs; IN8 monitoring of REF+ supports self-calibration sequences |
| No external clock required | Internal timing generator simplifies layout and eliminates clock routing noise coupling into analog section |
Applications
| Battery-Powered Data Loggers | Portable Medical Sensors |
|---|---|
|
Use Scenario: Continuous 10-second burst sampling of temperature, ECG, and battery voltage every 5 minutes in a wearable patch. IC Role / Device Role / Timing Role: 8-channel ADC acquires synchronized analog biosignals and supply metrics; 1.8µs conversion enables 400ksps burst while minimizing active time. Use Value: 1µA power-down current extends coin-cell life beyond 12 months; ratiometric operation maintains accuracy despite battery voltage sag. |
Use Scenario: Handheld pulse oximeter measuring SpO₂ via dual-wavelength photodiode signals and ambient light compensation. IC Role / Device Role / Timing Role: Simultaneous sampling of red/IR photodiode outputs, ambient sensor, and reference voltage on separate channels. Use Value: Internal track/hold captures fast transient photodiode pulses; ±1LSB TUE ensures reliable oxygen saturation calculation across patient skin tones. |
| Remote Environmental Monitoring Nodes | Industrial System Health Diagnostics |
|
Use Scenario: Solar-powered field node logging soil moisture, air temperature, humidity, and solar irradiance every 15 minutes. IC Role / Device Role / Timing Role: ADC interfaces with multiple analog sensor outputs; PWRDN pin synchronizes with MCU sleep/wake cycles. Use Value: 400ksps capability allows oversampling and digital filtering to improve SNR; SSOP package supports compact outdoor-rated PCB design. |
Use Scenario: PLC add-on module monitoring motor winding temperature, vibration (piezo), supply rail ripple, and fan tachometer. IC Role / Device Role / Timing Role: Digitizes four critical health parameters in sequence; IN8 monitors REF+ to detect reference drift during long-term operation. Use Value: 8-bit resolution suffices for trend analysis; 0°C to +70°C rating matches industrial enclosure thermal profile without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit, multi-channel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | SPI interface, 2.7V–5.25V supply, 1MSPS, no internal track/hold, 2.5µA power-down | Requires serial interface logic and external sample-hold for fast signals; better speed but higher system complexity | Choose ADS7822U when board space is constrained and SPI is already used; avoid if parallel µP bus is preferred or track/hold is mandatory |
| MAX11131AUT+ | 12-bit resolution, 500ksps, SPI, +2.7V–3.6V, 1µA power-down, internal reference | Higher precision but serial-only interface; lacks ratiometric REF−/REF+ flexibility and 8-channel mux | Choose MAX11131AUT+ when resolution >8-bit is required and reference stability outweighs channel count; not suitable for ratiometric sensor arrays |
Compared with ADS7822U and MAX11131AUT+, the MAX117CAI+ uniquely combines parallel 8-bit interface, integrated track/hold, 8-channel analog mux with REF+ monitoring, and true ratiometric reference architecture-making it optimal for cost-sensitive, µP-based embedded systems requiring minimal external components and deterministic timing.
Availability
MAX117CAI+ is available at Aetrix Electronics and suitable for battery-powered data loggers, portable medical sensors, remote environmental monitoring nodes, and industrial system health diagnostics requiring stable component supply across production lifecycles.
Supply support for MAX117CAI+ 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 MAX113/MAX117 family was engineered specifically for ultra-low-power, single-supply data acquisition in portable and remote systems-prioritizing micropower operation, ratiometric accuracy, and µP-friendly parallel interfacing over raw speed or resolution.
FAQ
What is the operating temperature range for MAX117CAI+?
The MAX117CAI+ is specified for 0°C to +70°C ambient operation. This commercial-grade temperature range aligns with its SSOP packaging and target applications in consumer-grade portable equipment and non-extreme industrial environments. The device's electrical characteristics-including ±1LSB total unadjusted error and 1.8µs conversion time-are guaranteed across this full range, with no derating required.
Does MAX117CAI+ require an external clock source?
No, the MAX117CAI+ does not require an external clock. It uses an internal timing generator to control the half-flash conversion process. All timing-including acquisition, conversion, and data latching-is derived from the VDD supply and controlled by digital strobes (WR, RD, CS). This eliminates clock routing, jitter sensitivity, and associated layout complexity in noise-critical analog designs.
How does the IN8 channel function in MAX117CAI+?
In the MAX117CAI+, IN8 is internally hardwired to REF+, so selecting channel A2A1A0 = 111 reads the REF+ voltage directly. This enables real-time monitoring of the reference potential-critical for detecting drift, verifying ratiometric integrity, or triggering recalibration. Unlike standard input channels, IN8 has no external pin and cannot be disconnected from REF+.
Can MAX117CAI+ operate with a 2.5V reference voltage?
Yes, the MAX117CAI+ supports ratiometric operation with any REF+ between VREF− and VDD. A 2.5V reference (e.g., from MAX872) is explicitly supported in the datasheet's Figure 7b. However, REF− must remain at GND or a defined offset, and the internal 1kΩ REF+–REF− path will draw current-requiring careful power-down sequencing if the reference is actively switched.
What is the minimum acquisition time (tACQ) for MAX117CAI+?
The minimum acquisition time tACQ for MAX117CAI+ is 450ns (typical) at TA = +25°C and VDD = +3V. This is the time required after address stabilization (A0–A2) before initiating conversion via WR or RD. At extremes of temperature or supply voltage, tACQ may increase to 700ns-designers must allow this margin in timing-critical burst-mode applications to ensure full settling of the internal track/hold amplifier.
MAX117CAI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 400k
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Flash
- Reference Type:
- External
- Voltage - Supply, Analog:
- 3V ~ 3.6V
- Voltage - Supply, Digital:
- 3V ~ 3.6V
- Features:
- Selectable Address
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX117CAI+ FAQ
1.How can I place an order for MAX117CAI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX117CAI+ 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 MAX117CAI+ reliable?
The price and inventory of MAX117CAI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX117CAI+ is usually 5 days.
3.What payment methods are accepted for MAX117CAI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX117CAI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX117CAI+?
MAX117CAI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX117CAI+ 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 MAX117CAI+?
For technical support, including MAX117CAI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX117CAI+ requirements.
6.How does Aetrix verify that MAX117CAI+ is sourced from the original manufacturer or authorized distributors?
All MAX117CAI+ 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 MAX117CAI+ meets industry standards.
7.What is the process for return or replacement of MAX117CAI+?
All MAX117CAI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX117CAI+, 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 MAX117CAI+ part is unused and in its original packaging.
Return procedure for MAX117CAI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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