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Analog Devices Inc./Maxim Integrated MAX117CAI+T
- Part No.:
- MAX117CAI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX117CAI+T.pdf
- Description:
- IC ADC 8BIT FLASH 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,758
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Product details
Overview
MAX117CAI+T 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, features internal track/hold and ratiometric reference inputs, and supports burst-mode operation via 1µA power-down mode - ideal for battery-powered remote sensor nodes.
For engineers reviewing the MAX117CAI+T datasheet, MAX117CAI+T pinout, MAX117CAI+T application, or MAX117CAI+T equivalent, key selection criteria include its 8-channel single-supply ADC architecture, guaranteed no-missing-codes performance, 1µA power-down current, 8-bit resolution with ≤1LSB total unadjusted error, and compatibility with 8-bit parallel µP buses without external interface logic.
Technical Context
The MAX117CAI+T implements a half-flash conversion architecture using two cascaded 4-bit flash ADC sections and an internal DAC to generate residue voltage for LSB determination - enabling 8-bit accuracy with only 15 comparators. Its analog multiplexer selects among eight input channels under A0–A2 address control, with IN8 internally hardwired to REF+ for reference monitoring.
Digital interface supports two modes: read mode (MODE = 0) where RD initiates conversion and WR/RDY acts as ready-status output, and write-read mode (MODE = 1) where WR starts conversion and INT signals completion. Timing is specified for CL = 100pF loads, with pipelined operation enabled by tying WR and RD together.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete digital codes across full-scale input range |
| Sampling Rate | 400ksps - supports real-time monitoring of signals up to 200kHz Nyquist bandwidth |
| Total Unadjusted Error | ≤1LSB - ensures monotonicity and no missing codes in all operating conditions |
| Power-Down Current | 1µA typical - enables ultra-low quiescent power in intermittent-sampling systems |
| Conversion Time | 1.8µs (WR-RD mode) - allows rapid channel cycling in multi-sensor polling applications |
| Supply Voltage Range | +3.0V to +3.6V - compatible with modern low-voltage battery and LDO-regulated systems |
| Input Channels | 8 analog inputs (IN1–IN7 + IN8 = REF+) - supports consolidated signal acquisition without external MUX |
Pinout & Package
The MAX117CAI+T is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.635mm pitch, JEDEC MO-153 compliant, body size 10.2mm × 5.3mm, and exposed pad not present.
| 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 |
| PWRDN (Pin 23) | Power-down control | Logic low reduces supply current to 1µA; wake-up latency <900ns enables burst-mode efficiency |
| A0–A2 (Pins 22, 21, 19) | Multiplexer address inputs | Select one of eight analog channels (IN1–IN7 or IN8=REF+); latched on WR or RD edge |
| IN1–IN7 (Pins 1–4, 27–28, 26) | Analog input terminals | High-impedance inputs with 32pF capacitance; support source impedances ≤1.5kΩ without extended tACQ |
| IN8 / REF+ (Pin 14) | Reference monitor channel | Internally connected to REF+; provides direct digitization of reference voltage for ratiometric calibration |
| REF+ / REF− (Pins 14, 13) | Reference span inputs | Define full-scale (REF+) and zero-scale (REF−) voltages; enable ratiometric operation with sensor bridges |
| RD / WR/RDY (Pins 10, 15) | Read control / status I/O | In read mode: RD initiates conversion, WR/RDY outputs ready signal; in write-read mode: WR starts conversion, RD reads data |
| INT (Pin 11) | Interrupt output | Open-drain active-low signal indicating end of conversion; resets on rising edge of CS or RD |
| D0–D7 (Pins 6–9, 17–20) | Three-state parallel data outputs | Latched 8-bit result; directly interface to 8-bit µP data bus without glue logic; high-impedance when CS high |
| CS (Pin 16) | Chip-select input | Active-low enable; must be low for WR/RD to be recognized; controls output driver enable state |
| MODE (Pin 5) | Interface mode select | Low = read mode (RD-controlled), high = write-read mode (WR-initiated, RD-read); internally pulled low |
| GND (Pin 12) | Analog/digital ground | Single ground pin; requires low-impedance connection to system ground plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Half-flash conversion architecture | Combines speed of flash ADC with area efficiency - achieves 8-bit resolution using only 15 comparators and internal DAC residue generation |
| Ratiometric reference configuration | Enables direct digitization of bridge sensors (e.g., strain gauges) where REF+ tracks excitation voltage, eliminating gain drift errors |
| Internal track/hold circuit | Acquires fast analog transients up to 0.5V/µs slew rate; eliminates need for external sample-and-hold in most industrial sensing applications |
| 8-channel integrated multiplexer | Reduces BOM count and PCB area vs. discrete MUX + ADC solutions; IN8 hardwired to REF+ supports self-calibration sequences |
| Microprocessor-compatible parallel interface | Appears as memory-mapped or I/O-port device; three-state outputs eliminate bus contention; no external address decoding required |
Applications
| Battery-Powered Remote Sensor Node | Portable Medical Vital Sign Monitor |
|---|---|
Use Scenario: Continuous acquisition of temperature, humidity, and pressure from MEMS sensors in wireless IoT node powered by coin-cell battery. IC Role / Device Role / Timing Role: 8-bit ADC digitizing four analog sensor outputs plus reference and supply rails; operates in burst mode with PWRDN toggled between 100ms measurement intervals. Use Value: 1µA power-down current extends battery life beyond 5 years; ratiometric operation compensates for Li-ion voltage sag during discharge. | Use Scenario: Real-time acquisition of ECG, SpO₂, and respiration waveforms in handheld patient monitor with LCD display and Bluetooth LE telemetry. IC Role / Device Role / Timing Role: Primary ADC handling multi-channel biopotential signal conditioning; uses internal track/hold to capture transient QRS complexes without external S/H. Use Value: 1.8µs conversion time enables >200ksps per channel sampling; ≤1LSB TUE ensures clinical-grade amplitude fidelity for arrhythmia detection. |
| Industrial System-Health Monitoring | Communications Baseband Signal Acquisition |
Use Scenario: Periodic voltage, current, and thermal monitoring of power supply rails and FPGA core in telecom base station shelf controller. IC Role / Device Role / Timing Role: ADC scanning eight critical analog health signals (VCCINT, VCCAUX, die temp, fan RPM, etc.) under µP command via A0–A2 addressing. Use Value: IN8 monitoring of REF+ enables automatic gain correction; 400ksps aggregate rate supports sub-second full-system diagnostics. | Use Scenario: Digitizing intermediate-frequency (IF) analog signals from RF front-end in software-defined radio test equipment. IC Role / Device Role / Timing Role: Low-latency ADC capturing 30kHz–200kHz baseband tones; operates in pipelined mode (WR=RD) to sustain continuous 400ksps throughput. Use Value: 45dB SINAD and 50dB SFDR meet Class B instrumentation requirements; 8-bit resolution sufficient for dynamic range compression pre-processing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit, low-power, multi-channel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit resolution, SPI interface, 200ksps max, no internal track/hold, 2.7V–5.25V supply | Higher precision but slower; requires external S/H and serial interface logic; better for precision DC measurements | Select when 12-bit resolution and SPI compatibility outweigh speed and integration trade-offs |
| MAX11100ETE+ | 12-bit, 8-channel, SPI interface, 1MSPS, internal reference, 2.7V–3.6V supply, 3.5µA power-down | Higher speed and resolution but SPI-only; lacks parallel µP interface and 1µA ultra-low-power mode | Choose for higher-resolution data logging where µP has SPI peripheral and layout space permits serial interface |
Compared with ADS7822U and MAX11100ETE+, the MAX117CAI+T uniquely combines 8-bit parallel interfacing, 1µA power-down, internal track/hold, and 8-channel integration in a single +3V supply device - making it optimal for cost-sensitive, µP-based embedded systems requiring minimal external components and maximum sleep-mode efficiency.
Availability
MAX117CAI+T is available at Aetrix Electronics and suitable for battery-powered systems, portable medical devices, industrial system-health monitoring, and communications baseband acquisition requiring stable component supply across automotive-grade temperature ranges (0°C to +70°C).
Supply support for MAX117CAI+T 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, communications, and consumer applications.
The MAX117CAI+T belongs to Maxim's precision data acquisition product line, engineered for low-power, microprocessor-centric embedded systems where integration, supply flexibility, and burst-mode efficiency are critical design constraints.
FAQ
What is the operating temperature range for the MAX117CAI+T?
The MAX117CAI+T is rated for commercial temperature operation from 0°C to +70°C. This grade is validated per the MAX117C_I ordering code in Maxim's datasheet, and applies specifically to the SSOP package variant denoted by the "AI" suffix. The device meets all electrical specifications across this full range, including 1.8µs conversion time and ≤1LSB total unadjusted error.
Does the MAX117CAI+T require an external clock source?
No, the MAX117CAI+T does not require an external clock. It uses an internal timing generator synchronized to control signals (WR or RD), enabling fully autonomous conversion initiation. This eliminates clock distribution complexity and jitter concerns in µP-based systems - a key advantage confirmed in the Functional Diagram and Timing Characteristics section of the datasheet.
How does the IN8 channel function in the MAX117CAI+T?
In the MAX117CAI+T, IN8 is internally hardwired to REF+, so selecting channel 111 (A2=1, A1=1, A0=1) digitizes the reference voltage itself. This enables real-time monitoring of REF+ stability and supports ratiometric calibration routines - a feature explicitly documented in Table 1 (Truth Table for Input Channel Selection) and the Detailed Description section.
Can the MAX117CAI+T interface directly with an 8-bit microprocessor data bus?
Yes, the MAX117CAI+T interfaces directly with an 8-bit µP data bus via its latched, three-state D0–D7 outputs. When CS is low, data appears on these pins after conversion; when CS is high, outputs enter high-impedance state - eliminating need for external bus transceivers or address decoders, as stated in the General Description and Digital Interface sections.
What is the minimum acquisition time (tACQ) requirement for the MAX117CAI+T?
The MAX117CAI+T specifies a minimum acquisition time tACQ of 450ns (typical) at TA = +25°C and VDD = +3V. This value increases slightly with temperature and decreases with higher supply voltage. It represents the time required for the internal track/hold to settle after power-up or channel change before valid conversion begins - a parameter rigorously defined in the Timing Characteristics table.
MAX117CAI+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX117CAI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX117CAI+T 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+T reliable?
The price and inventory of MAX117CAI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX117CAI+T is usually 5 days.
3.What payment methods are accepted for MAX117CAI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX117CAI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX117CAI+T?
MAX117CAI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX117CAI+T 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+T?
For technical support, including MAX117CAI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX117CAI+T requirements.
6.How does Aetrix verify that MAX117CAI+T is sourced from the original manufacturer or authorized distributors?
All MAX117CAI+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX117CAI+T?
All MAX117CAI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX117CAI+T, 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+T part is unused and in its original packaging.
Return procedure for MAX117CAI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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