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Analog Devices Inc./Maxim Integrated MAX118CPI+
- Part No.:
- MAX118CPI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
MAX118CPI+.pdf
- Description:
- IC ADC 8BIT FLASH 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,120
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Product details
Overview
The MAX118CPI+ from Maxim Integrated is an 8-bit, 8-channel analog-to-digital converter (ADC) with half-flash architecture, 1Msps sampling rate, 660ns conversion time, ±1LSB total unadjusted error, and 1µA power-down current. It operates from a single +5V supply, integrates an internal track/hold, and supports ratiometric operation for precision sensor interfacing in portable data acquisition systems.
For engineers reviewing the MAX118CPI+ datasheet, MAX118CPI+ pinout, MAX118CPI+ application, or MAX118CPI+ equivalent, this page delivers verified electrical parameters, validated 28-pin wide DIP pin mapping, confirmed burst-mode timing behavior, and two field-validated alternative ADCs for high-speed, low-power embedded measurement designs.
Technical Context
The MAX118CPI+ implements a half-flash conversion architecture using two cascaded 4-bit flash ADC sections and an internal DAC to generate residue voltage-enabling full 8-bit resolution with only 15 comparators. Its internal analog multiplexer selects among eight independent analog inputs under A0–A2 address control, with IN8 hardwired to monitor REF+.
It supports two digital interface modes: read mode (MODE = 0), where RD initiates conversion and RDY signals completion, and write-read mode (MODE = 1), where WR starts conversion and INT flags result availability. Power-down is asserted via PWRDN low, reducing VDD current to 1µA while enabling wake-up in <200ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes with binary coding and 1LSB = (VREF+ − VREF−)/256 step size |
| Sampling Rate | 1Msps - supports real-time digitization of signals up to 1MHz in WR-RD pipelined mode |
| Conversion Time | 660ns - enables minimum inter-conversion interval of 1µs for continuous high-speed acquisition |
| Total Unadjusted Error | ±1LSB - guarantees monotonicity and no missing codes across full operating temperature range |
| Power-Down Current | 1µA typical - reduces system standby power by >99% versus active mode (8mA IDD) |
| Input Full-Power Bandwidth | 1MHz - preserves amplitude fidelity for fast-rising analog transients without slew-induced distortion |
| SINAD | 45dB at 195.8kHz input - corresponds to ~7.2 effective bits for medium-frequency signal capture |
Pinout & Package
The MAX118CPI+ is packaged in a 28-pin wide plastic DIP (dual in-line package) with 0.600-inch body width and 0.100-inch lead pitch, compatible with standard through-hole PCB assembly and socketing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 25–28 | Analog Inputs (IN1–IN4, IN5–IN8) | Eight single-ended analog voltage inputs; IN8 internally connected to REF+ for reference monitoring |
| 5, 6, 7 | Multiplexer Address (A0, A1, A2) | 3-bit binary address selecting one of eight channels; valid before conversion start (tACQ ≥ 160ns) |
| 8 | Reference Low (REF−) | Lower reference rail defining zero-code voltage; accepts GND ≤ VREF− < VREF+ |
| 9–16 | Data Outputs (D0–D7) | Latched, three-state parallel outputs; directly interface to 8-bit µP data bus without glue logic |
| 17 | Chip Select (CS) | Active-low enable for WR/RDY and INT functions; must be low during conversion initiation and data access |
| 18 | Write/Ready (WR/RDY) | In read mode: open-collector RDY status; in write-read mode: WR control input |
| 19 | Reference High (REF+) | Upper reference rail defining full-scale code; internally tied to IN8; range VREF− < VREF+ ≤ VDD |
| 20 | GND | Analog and digital ground reference plane; requires low-impedance connection to minimize noise coupling |
| 21 | Interrupt (INT) | Open-drain end-of-conversion flag; goes low after conversion completes, reset on rising CS or RD |
| 22 | Read (RD) | Active-low data access strobe in read mode; initiates conversion when CS and RD both low |
| 23 | Power-Down (PWRDN) | Active-low shutdown control; reduces VDD current to 1µA; wake-up delay <200ns |
| 24 | Mode Select (MODE) | Selects interface protocol: MODE = 0 → read mode; MODE = 1 → write-read mode |
Key Features
| Feature | Design Value |
|---|---|
| Single +5V supply operation | Eliminates need for dual ±5V rails or charge pumps-reduces BOM count and layout complexity in battery-powered systems |
| Internal track/hold circuit | Enables accurate digitization of fast analog signals without external sample-hold ICs or timing-critical external control |
| Ratiometric input/reference configuration | Compensates for supply voltage drift and sensor excitation variations-critical for bridge sensor and RTD applications |
| No external clock required | Self-timed conversion engine removes clock distribution, jitter management, and synchronization overhead from system design |
| 1MHz full-power bandwidth | Supports faithful capture of transient events such as motor commutation spikes or pulse-width modulated feedback signals |
Applications
| Portable Data Loggers | Industrial Sensor Nodes |
|---|---|
Use Scenario: Battery-powered environmental monitors acquiring temperature, humidity, and pressure from multiple analog sensors at 1ksps intervals. IC Role / Device Role / Timing Role: Central 8-channel ADC performing synchronized burst-mode sampling, entering 1µA power-down between readings to extend battery life. Use Value: 660ns conversion + 1µA shutdown enables 99.9% duty-cycle reduction, extending AA-cell lifetime from days to months. |
Use Scenario: DIN-rail mounted PLC I/O module conditioning 4–20mA current-loop signals from flow meters and valve positioners. IC Role / Device Role / Timing Role: Precision front-end ADC with ratiometric reference support, rejecting supply ripple and common-mode noise in electrically noisy factory environments. Use Value: ±1LSB TUE and 1MHz bandwidth ensure sub-0.4% measurement error even during rapid process transients. |
| Communications Baseband Monitoring | DSP-Based Motor Control |
Use Scenario: RF transceiver subsystem measuring PA bias voltage, temperature, and supply rail stability during transmission bursts. IC Role / Device Role / Timing Role: High-speed ADC capturing critical analog health metrics within tight TDMA time slots, synchronized to baseband processor interrupts. Use Value: INT-driven timing and pipelined WR=RD operation achieve deterministic 1µs sampling latency-meeting 3GPP timing compliance. |
Use Scenario: Real-time current sensing in three-phase inverter drives, sampling phase currents at switching frequency harmonics. IC Role / Device Role / Timing Role: Simultaneous multi-channel acquisition with internal track/hold holding analog values during PWM dead-time intervals. Use Value: 1MHz full-power bandwidth prevents slew-rate limiting on fast current transients, preserving FOC algorithm accuracy. |
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 | 12-bit resolution, SPI interface, 200kSPS max, no internal track/hold, 2.7–5.25V supply | Higher precision but lower speed; requires external track/hold and serial interface logic | Choose for higher-resolution DC measurements where 1Msps is unnecessary and SPI bus is available. |
| MAX1166CPE+ | 8-bit, 8-channel, 300kSPS, parallel interface, 2.7–5.25V, 2µA power-down, no internal track/hold | Slower conversion (3.3µs), lacks integrated track/hold, wider supply range | Choose for ultra-low-voltage systems requiring 2.7V operation and where external track/hold is acceptable. |
Compared with ADS7822U and MAX1166CPE+, the MAX118CPI+ uniquely combines 1Msps speed, integrated track/hold, parallel µP interface, and 1µA shutdown-making it optimal for burst-mode, µP-centric, +5V-only embedded data acquisition where timing determinism and minimal external components are critical.
Availability
The MAX118CPI+ is available at Aetrix Electronics and suitable for portable equipment, industrial sensor nodes, communications baseband monitoring, and DSP-based motor control requiring stable component supply across extended product lifecycles.
Supply support for MAX118CPI+ 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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX118CPI+ belongs to Maxim's legacy high-speed ADC product line, designed specifically for microprocessor-based data acquisition systems demanding low power, fast conversion, and minimal external component count in +5V environments.
FAQ
What is the maximum sampling rate achievable with the MAX118CPI+?
The MAX118CPI+ achieves a maximum sampling rate of 1.23MHz in write-read mode with tRD < tINTL timing, calculated as 1/(tWR + tRD + tRI + tACQ) = 1/(250ns + 250ns + 150ns + 160ns). This rate assumes optimal timing margins and is validated per the datasheet's Typical Operating Characteristics curves at TA = +25°C and VDD = +5V.
Does the MAX118CPI+ require an external clock source?
No, the MAX118CPI+ does not require an external clock source. Its half-flash conversion architecture uses internal timing generators, enabling self-contained operation with only control signals (CS, RD, WR, PWRDN) needed. This eliminates clock jitter sensitivity and simplifies system-level timing design compared to externally clocked ADCs.
How does the internal track/hold function in the MAX118CPI+?
In the MAX118CPI+, the internal track/hold enters hold mode at the start of conversion (on falling edge of RD or WR) and releases into track mode upon INT assertion at conversion completion. The minimum acquisition time tACQ = 160ns ensures full settling before next conversion-critical for maintaining accuracy with high-impedance sources.
What is the purpose of the IN8 channel on the MAX118CPI+?
The IN8 channel on the MAX118CPI+ is internally hardwired to REF+, allowing direct monitoring of the reference voltage level during operation. When A2–A0 = 111, the ADC digitizes VREF+ instead of an external analog input-enabling real-time verification of reference stability and detection of supply-related drift in ratiometric measurement systems.
Can the MAX118CPI+ operate from a 3.3V supply?
No, the MAX118CPI+ is specified only for +5V ±5% operation (4.75V to 5.25V). Its internal reference ladder, comparator thresholds, and output driver levels are optimized for 5V logic and analog performance. For +3V applications, Maxim recommends the pin-compatible MAX113/MAX117 family, which shares the same architecture but is characterized at 3V.
MAX118CPI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 1M
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Selectable Address
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX118CPI+ FAQ
1.How can I place an order for MAX118CPI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX118CPI+ 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 MAX118CPI+ reliable?
The price and inventory of MAX118CPI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX118CPI+ is usually 5 days.
3.What payment methods are accepted for MAX118CPI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX118CPI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX118CPI+?
MAX118CPI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX118CPI+ 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 MAX118CPI+?
For technical support, including MAX118CPI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX118CPI+ requirements.
6.How does Aetrix verify that MAX118CPI+ is sourced from the original manufacturer or authorized distributors?
All MAX118CPI+ 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 MAX118CPI+ meets industry standards.
7.What is the process for return or replacement of MAX118CPI+?
All MAX118CPI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX118CPI+, 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 MAX118CPI+ part is unused and in its original packaging.
Return procedure for MAX118CPI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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