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Analog Devices Inc./Maxim Integrated MAX122ACAG
- Part No.:
- MAX122ACAG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX122ACAG.pdf
- Description:
- IC ADC 12BIT SAR 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,469
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Product details
Overview
The MAX122ACAG from Maxim Integrated is a 12-bit, 333ksps BiCMOS analog-to-digital converter with integrated track/hold and -5V internal reference, operating from ±5V analog input range and requiring only decoupling capacitors for power and reference. It delivers 70dB SINAD and -77dB THD at 50kHz input, targeting high-speed data acquisition in industrial instrumentation and telecom signal processing.
For engineers reviewing the MAX122ACAG datasheet, MAX122ACAG pinout, MAX122ACAG application, or MAX122ACAG equivalent, this page provides verified timing behavior, bipolar two's-complement output format, TTL/CMOS-compatible digital interface, and SSOP-24 package-specific thermal derating and layout guidance.
Technical Context
The MAX122ACAG implements successive approximation architecture with a dedicated on-chip track/hold circuit exhibiting 350ns acquisition time and 10ns aperture delay. Its internal -5V buried-zener reference has ±25ppm/°C drift and supports up to 5mA external sink load when bypassed with 22µF || 0.1µF at VREF–AGND.
Digital control uses asynchronous CONVST, CS, and RD inputs with five configurable operating modes-including continuous-conversion (mode 5) at 14-clock-cycle intervals-and outputs INT/BUSY status based on MODE pin configuration (VDD = interrupt, DGND/open = busy). Data appears in two's-complement format on D11–D0 with 75ns access time and 65ns bus-relinquish time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit, guaranteed no missing codes over temperature |
| Throughput Rate | 333ksps (2.6µs conversion time at 5MHz clock) |
| Analog Input Range | ±5V bipolar, overvoltage tolerant to ±15V |
| SINAD | 70dB min at 50kHz input, enabling 10.3 ENOB for spectral analysis |
| THD | -77dB max (first five harmonics), critical for low-distortion audio capture |
| Power Dissipation | 210mW typical at VDD=+5V, VSS=-12V, supporting thermally constrained PCB layouts |
| Reference Output | -5.00V ±2mV at +25°C, ±25ppm/°C drift, requires 22µF || 0.1µF bypass |
Pinout & Package
MAX122ACAG is housed in a 24-pin SSOP (Shrink Small Outline Package) with 0.635mm pitch, 8.65mm × 3.9mm body size, and RoHS-compliant lead-free finish. Thermal derating is 8.00mW/°C above +70°C (640mW max at TA=+70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MODE | Mode Configuration Input | Hardwired to VDD for INT output; DGND or open for BUSY output; sets operational mode logic |
| 2 VSS | Negative Power Supply | -10.8V to -15.75V supply rail; must be decoupled to AGND with 0.1µF ceramic |
| 3 VDD | Positive Power Supply | +4.75V to +5.25V supply rail; bypassed to DGND with 0.1µF + 10µF |
| 4 AIN | Analog Input | ±5V bipolar input with 6kΩ || 10pF equivalent impedance; tolerant to ±15V fault |
| 5 VREF | Internal Reference Output | -5.00V reference; requires 22µF electrolytic || 0.1µF ceramic to AGND |
| 6 AGND | Analog Ground | Separate ground return for analog section; tied to DGND at single point near supply |
| 7–11,13–19 D11–D0 | Data Outputs | Three-state, TTL/CMOS-compatible 12-bit bus; D11 = MSB, D0 = LSB, two's-complement format |
| 12 DGND | Digital Ground | Ground return for digital I/O; isolated from AGND except at star point |
| 20 CONVST | Convert Start | Falling-edge triggered; initiates conversion and places T/H into hold mode |
| 21 CLKIN | Master Clock Input | 0.1MHz–5MHz TTL-compatible clock; determines conversion rate and timing precision |
| 22 INT/BUSY | Status Output | Configurable as interrupt (MODE=VDD) or busy flag (MODE=DGND/open); indicates conversion completion or in-progress state |
| 23 CS | Chip Select | Active-low enable for data outputs; falling edge with RD low initiates conversion in mode 1 |
| 24 RD | Read Strobe | Active-low read control; enables outputs when CS is low; falling edge initiates conversion in ROM mode |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Track/Hold | 350ns acquisition time eliminates need for external hold capacitor and reduces board space |
| Bipolar ±5V Input | Direct interface to industrial sensor outputs without level-shifting circuitry |
| Five Operating Modes | Supports µP wait-state, FIFO-buffered, DMA-linked, and stand-alone systems without firmware modification |
| On-Chip -5V Reference | Stable 20ppm/°C drift enables precision measurements without external reference IC |
| TTL/CMOS-Compatible I/O | Direct connection to legacy microprocessors and FPGAs without level translators |
Applications
| Industrial Data Acquisition | Telecom Signal Processing |
|---|---|
Use Scenario: Real-time monitoring of motor current, voltage, and temperature in programmable logic controller (PLC) backplanes. IC Role / Device Role / Timing Role: ADC front-end converting ±5V sensor outputs at 333ksps with 70dB SINAD for FFT-based fault detection. Use Value: Enables 12-bit resolution across full industrial temperature range without calibration drift compensation. | Use Scenario: Digitizing baseband voice signals in channelized T1/E1 line cards before DSP-based echo cancellation. IC Role / Device Role / Timing Role: High-fidelity sampling of ±5V analog voice channels at 50kHz bandwidth with -77dB THD. Use Value: Maintains carrier-grade SNR in multi-channel telecom systems using shared clock and reference resources. |
| Audio Test Equipment | Spectrum Analysis Systems |
Use Scenario: Capturing transient audio waveforms in benchtop audio analyzers during amplifier distortion testing. IC Role / Device Role / Timing Role: Precision ADC capturing 100ms bursts at 333ksps with two's-complement output for real-time harmonic analysis. Use Value: Delivers 10.3 effective bits (ENOB) at 50kHz, meeting AES17 standard for audio measurement accuracy. | Use Scenario: Real-time RF spectrum monitoring in EMI pre-compliance test receivers scanning 0–10MHz bands. IC Role / Device Role / Timing Role: High-speed digitizer feeding FPGA-based FFT engine with deterministic 2.6µs conversion latency. Use Value: Supports 12-bit dynamic range across full Nyquist band without missing codes, ensuring reliable spurious detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, medium-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7V–5.25V single-supply, SPI interface, 200ksps, no internal reference | Requires external reference and level-shifting for ±5V inputs; suited for battery-powered portable instruments | Select when system uses SPI bus and operates from single 3.3V/5V rail with lower power budget |
| AD7892BRZ-1 | ±5V dual-supply, parallel interface, 500ksps, 12-bit, no internal T/H | Needs external track/hold for AC-coupled signals; higher throughput but larger footprint (28-lead SOIC) | Select when maximum speed (500ksps) is required and board space allows external T/H integration |
Compared with ADS7822U and AD7892BRZ-1, the MAX122ACAG uniquely integrates track/hold, -5V reference, and ±5V input tolerance in a compact SSOP-24 package-reducing BOM count and layout complexity for fixed-function industrial data loggers.
Availability
MAX122ACAG is available at Aetrix Electronics and suitable for industrial data acquisition, telecom signal processing, and audio test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX122ACAG 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 industrial, automotive, and communications applications.
The MAX120/MAX122 product line delivers high-speed, high-accuracy ADCs with integrated references and track/hold for demanding signal acquisition in instrumentation and telecom infrastructure.
FAQ
What is the maximum clock frequency supported by the MAX122ACAG?
The MAX122ACAG accepts clock frequencies from 0.1MHz to 5MHz. At 5MHz, it achieves its rated 333ksps throughput with 2.6µs conversion time. Operation above 5MHz is not specified and may cause timing violations or missing codes, as confirmed in the Electrical Characteristics table under "Clock Frequency" parameter.
Does the MAX122ACAG require external components for basic operation?
Yes-the MAX122ACAG requires external decoupling capacitors: 0.1µF ceramic + 10µF electrolytic on VDD to DGND, and 22µF electrolytic || 0.1µF ceramic on VREF to AGND. No external track/hold capacitor or reference IC is needed, as both are integrated. These values are specified in the Pin Description and Layout sections of the datasheet.
How does the MODE pin affect the INT/BUSY output behavior of the MAX122ACAG?
When MODE is connected to VDD, INT/BUSY functions as an interrupt output that goes low upon conversion completion and returns high after data read. When MODE is open or tied to DGND, INT/BUSY acts as a busy flag-going low at conversion start and returning high only after data is valid. This behavior is defined in the Pin Description and Operating Modes sections.
What is the analog input impedance of the MAX122ACAG at the AIN pin?
The MAX122ACAG presents an input impedance of approximately 6kΩ in parallel with 10pF at the AIN pin, as stated in the "Analog Input" section under "Input Current" and "Input Capacitance" parameters. This value remains consistent across temperature and supply conditions and is critical for anti-alias filter design.
Can the MAX122ACAG operate with a single positive supply voltage?
No-the MAX122ACAG requires dual supplies: +4.75V to +5.25V on VDD and -10.8V to -15.75V on VSS. The internal -5V reference and ±5V analog input range depend on this dual-rail configuration. Attempting single-supply operation violates Absolute Maximum Ratings and will result in nonfunctional or damaged units.
MAX122ACAG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 333k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V, -10.8V ~ 15.75V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX122ACAG FAQ
1.How can I place an order for MAX122ACAG through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX122ACAG 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 MAX122ACAG reliable?
The price and inventory of MAX122ACAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX122ACAG is usually 5 days.
3.What payment methods are accepted for MAX122ACAG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX122ACAG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX122ACAG?
MAX122ACAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX122ACAG 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 MAX122ACAG?
For technical support, including MAX122ACAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX122ACAG requirements.
6.How does Aetrix verify that MAX122ACAG is sourced from the original manufacturer or authorized distributors?
All MAX122ACAG 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 MAX122ACAG meets industry standards.
7.What is the process for return or replacement of MAX122ACAG?
All MAX122ACAG units undergo pre-shipment inspection (PSI). If there is an issue with MAX122ACAG, 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 MAX122ACAG part is unused and in its original packaging.
Return procedure for MAX122ACAG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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