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Analog Devices Inc./Maxim Integrated MAX117CPI
- Part No.:
- MAX117CPI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
MAX117CPI.pdf
- Description:
- IC ADC 8BIT FLASH 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,400
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Product details
Overview
MAX117CPI from Maxim Integrated is an 8-bit, 8-channel analog-to-digital converter (ADC) designed for low-power, microprocessor-compatible data acquisition. It operates from a single +3.0V to +3.6V supply, achieves 400ksps sampling rate with 1.8µs conversion time per channel, and features 1µA power-down current. It integrates an internal track/hold, ratiometric reference inputs, and supports both read mode and write-read digital interface modes - ideal for battery-powered remote sensing and portable health-monitoring systems.
For engineers reviewing the MAX117CPI datasheet, MAX117CPI pinout, MAX117CPI application, or MAX117CPI equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in the official MAX117 datasheet and Maxim's published specifications for the C-grade, 28-pin plastic DIP variant.
Technical Context
The MAX117CPI uses a half-flash architecture with two cascaded 4-bit flash ADC sections and an internal DAC to generate the full 8-bit result in one pipeline stage. Its analog multiplexer selects among eight input channels under A0–A2 address control, with IN8 hardwired to monitor REF+ voltage directly.
Digital interface operation depends on the MODE pin: in read mode (MODE = GND), RD initiates conversion and WR/RDY acts as a ready-status output; in write-read mode (MODE = VDD), WR starts conversion and INT signals completion while RD accesses latched data. Power-down is asserted via PWRDN low, enabling sub-µA quiescent current with <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 maximum - achieved in write-read mode with tRD < tINTL timing configuration |
| Conversion Time | 1.8µs per channel - fixed latency independent of input signal slew rate due to integrated track/hold |
| Power-Down Current | 1µA typical - enables burst-mode operation with rapid wake-up (<900ns) for ultra-low average power |
| Total Unadjusted Error | ≤ ±1LSB - guarantees monotonicity and no missing codes across full temperature range (0°C to +70°C) |
| Supply Voltage Range | +3.0V to +3.6V - single-supply operation compatible with Li-ion and regulated 3.3V systems |
| Input Channels | 8 analog inputs (IN1–IN7 + IN8) - IN8 internally connected to REF+, enabling reference monitoring |
Pinout & Package
The MAX117CPI is packaged in a 28-pin wide-body plastic DIP (Dual In-line Package), with 0°C to +70°C commercial temperature grade and through-hole mounting compatibility.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | IN1–IN8 analog inputs | IN1–IN7 accept external signals; IN8 is internally tied to REF+ and provides reference voltage monitoring |
| 9, 10, 11 | D0–D2 data outputs | Three-state, latched LSB outputs for direct connection to 8-bit µP data bus without external buffers |
| 12 | GND | Analog and digital ground reference - must be low-impedance common point for noise-sensitive ADC operation |
| 13 | REF− | Lower reference rail - sets zero-code voltage; range: GND ≤ REF− < REF+ |
| 14 | REF+ | Upper reference rail - sets full-scale voltage; range: REF− < REF+ ≤ VDD |
| 15 | WR/RDY | Configurable dual-function pin: write-control input in write-read mode; ready-status open-collector output in read mode |
| 16 | CS | Chip-select enable - must be low for WR or RD to be recognized; controls device activation and INT reset |
| 17, 18, 19 | D4–D6 data outputs | Three-state, latched mid-byte outputs - support parallel µP interfacing with standard 8-bit bus timing |
| 20 | D7 | Three-state, latched MSB output - completes 8-bit parallel data word aligned with D0–D6 |
| 21, 22, 23 | A0–A2 address inputs | 3-bit binary channel select - determines which of eight analog inputs is sampled during next conversion |
| 24 | VDD | +3.0V to +3.6V supply - powers analog core, digital logic, and internal track/hold; requires 4.7µF + 0.1µF bypassing |
| 25 | PWRDN | Active-low power-down control - reduces VDD current to 1µA; must be driven to GND or VDD (not floating) |
| 26 | MODE | Interface mode selector - low = read mode (RD-initiated); high = write-read mode (WR-initiated with INT signaling) |
| 27 | INT | Open-drain interrupt - goes low at end of conversion; resets on rising edge of CS or RD |
| 28 | RD | Read-control input - enables data output drivers in both interface modes; controls data access timing and INT reset |
Key Features
| Feature | Design Value |
|---|---|
| Ratiometric reference inputs | REF+ and REF− define full-scale and zero-scale voltages, enabling immunity to supply and reference drift in sensor bridge applications |
| Internal track/hold circuit | Eliminates need for external sample-and-hold; acquires fast analog signals up to 0.5V/µs slew rate with 450ns minimum acquisition time |
| No external clock required | All timing generated internally - simplifies system design and reduces BOM count in space-constrained portable devices |
| Microprocessor-compatible interface | Latched three-state outputs and dual-mode digital control (read/write-read) allow direct connection to 8-bit µP buses without glue logic |
| Channel-to-channel mismatch | ±1/4 LSB - ensures accurate relative measurements across multiple sensor inputs in multi-channel monitoring systems |
Applications
| Battery-Powered Remote Sensors | Portable Medical Instrumentation |
|---|---|
Use Scenario: Continuous voltage/current monitoring of environmental sensors (temperature, humidity, gas) in solar-powered field nodes with intermittent transmission. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog outputs from multiple transducers; 1.8µs conversion enables rapid channel scanning before entering 1µA sleep state. Use Value: Enables >1-year battery life via burst-mode operation - wake-up, sample 8 channels, process, transmit, return to 1µA power-down within <10ms. |
Use Scenario: Real-time acquisition of ECG, pulse oximetry, or blood pressure waveforms in handheld diagnostic tools. IC Role / Device Role / Timing Role: Digitizes low-noise analog front-end outputs with 45dB SINAD and no missing codes, supporting clinical-grade waveform fidelity. Use Value: Delivers 7.5 effective bits at 30kHz input frequency - sufficient for 12-bit-equivalent dynamic range in critical biomedical signal capture. |
| Industrial System Health Monitoring | Communications Baseband Signal Acquisition |
Use Scenario: Embedded monitoring of power supply rails, fan speeds, and thermal sensors inside network switches or PLCs. IC Role / Device Role / Timing Role: Ratiometric operation compensates for reference drift; IN8 monitoring of REF+ validates reference integrity before each measurement set. Use Value: Ensures long-term accuracy without calibration - ±1LSB TUE over 0°C to +70°C eliminates periodic recalibration in unattended equipment. |
Use Scenario: Digitizing IF or baseband analog signals in low-data-rate wireless modems (e.g., LoRa, NB-IoT) where power efficiency outweighs speed. IC Role / Device Role / Timing Role: 400ksps sampling meets Nyquist requirements for <200kHz bandwidth signals; internal track/hold captures transient bursts without external hold circuitry. Use Value: Reduces PCB area and component count - replaces discrete S&H + ADC combo with single 28-pin DIP, easing layout and qualification. |
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 | 2.7V–5.25V supply; SPI interface; 1MSPS; no internal track/hold; 6-channel | Requires external S&H for fast signals; better suited for higher-speed, serial-interface systems with tighter board space | Select when SPI bus integration and >400ksps are needed, and external track/hold is acceptable |
| MAX1113CPE+ | +5V-only supply; 4-channel; 500ksps; 1µA power-down; same package footprint but different pinout | Not pin-compatible; lacks IN8 reference monitoring; limited to 4 inputs | Consider only for legacy +5V designs requiring identical 24-pin DIP mechanical fit and lower channel count |
Compared with ADS7822U and MAX1113CPE+, the MAX117CPI uniquely combines 8-channel count, internal track/hold, ratiometric reference support, and true 1µA power-down in a single +3V-compatible DIP package - making it optimal for cost-sensitive, low-power, multi-sensor embedded systems where parallel µP interfacing is preferred.
Availability
MAX117CPI is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instrumentation, and industrial system-health monitoring requiring stable component supply across extended production lifecycles.
Supply support for MAX117CPI 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 precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and communications applications.
The MAX117CPI belongs to Maxim's legacy low-power ADC product line, engineered specifically for microprocessor-based data acquisition in resource-constrained, battery-operated environments where conversion speed, accuracy, and ultra-low standby current are jointly critical.
FAQ
What is the operating temperature range for the MAX117CPI?
The MAX117CPI is specified for 0°C to +70°C commercial temperature operation. This grade is confirmed in the Ordering Information table, where "CPI" denotes the 28-pin wide plastic DIP package with 0°C to +70°C range. It is not rated for extended industrial or automotive temperatures.
Does the MAX117CPI require an external clock source?
No, the MAX117CPI does not require an external clock. All timing-including conversion initiation, internal half-flash sequencing, and data latching-is generated internally. This eliminates clock distribution complexity and jitter sensitivity, simplifying design in portable and noise-sensitive applications.
How does the IN8 channel function in the MAX117CPI?
In the MAX117CPI, IN8 is internally hardwired to REF+, so selecting channel A2:A1:A0 = 111 reads the instantaneous REF+ voltage. This enables real-time verification of reference stability before or after conversions - a key diagnostic feature for ratiometric sensor systems.
What is the purpose of the MODE pin on the MAX117CPI?
The MODE pin on the MAX117CPI selects between two digital interface protocols: MODE = GND configures read mode (RD-initiated conversion, WR/RDY as ready output); MODE = VDD configures write-read mode (WR-initiated conversion, INT signaling completion). This flexibility supports diverse µP bus architectures without hardware changes.
Can the MAX117CPI operate from a +5V supply?
No, the MAX117CPI is not rated for +5V operation. Its absolute maximum VDD is +7V, but the electrical characteristics and guaranteed performance (including 1.8µs conversion time and 1µA power-down) are specified only for +3.0V to +3.6V. For +5V systems, Maxim recommends the pin-compatible MAX118 family instead.
MAX117CPI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX117CPI FAQ
1.How can I place an order for MAX117CPI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX117CPI 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 MAX117CPI reliable?
The price and inventory of MAX117CPI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX117CPI is usually 5 days.
3.What payment methods are accepted for MAX117CPI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX117CPI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX117CPI?
MAX117CPI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX117CPI 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 MAX117CPI?
For technical support, including MAX117CPI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX117CPI requirements.
6.How does Aetrix verify that MAX117CPI is sourced from the original manufacturer or authorized distributors?
All MAX117CPI 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 MAX117CPI meets industry standards.
7.What is the process for return or replacement of MAX117CPI?
All MAX117CPI units undergo pre-shipment inspection (PSI). If there is an issue with MAX117CPI, 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 MAX117CPI part is unused and in its original packaging.
Return procedure for MAX117CPI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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