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Analog Devices Inc./Maxim Integrated MAX122ACWG+
- Part No.:
- MAX122ACWG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX122ACWG+.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,185
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Product details
Overview
The MAX122ACWG+ from Maxim Integrated is a 12-bit, 333ksps BiCMOS sampling analog-to-digital converter with integrated track/hold and -5V buried-zener reference, designed for high-speed bipolar data acquisition in systems requiring ±5V input range and TTL/CMOS-compatible microprocessor interfacing.
For engineers reviewing the MAX122ACWG+ datasheet, MAX122ACWG+ pinout, MAX122ACWG+ application, or MAX122ACWG+ equivalent, key selection considerations include its 2.6µs conversion time, 24-pin wide SO package, -40°C to +85°C industrial temperature grade, ±3/4 LSB INL, and compatibility with FIFO-buffered or wait-state-free µP interfaces.
Technical Context
The MAX122ACWG+ employs successive approximation architecture with an on-chip track/hold featuring 350ns acquisition time and 30ps aperture jitter. It operates with a 0.1MHz–5MHz external TTL/CMOS clock and supports five distinct interface modes (including continuous-conversion and full-control) via MODE, CONVST, RD, and CS pins.
Its internal -5V reference exhibits ±25ppm/°C drift and requires dual bypassing (0.1µF ceramic || 22µF low-ESR electrolytic). Analog input presents 6kΩ || 10pF impedance, accepts ±5V bipolar signals with ±15V overvoltage tolerance, and delivers 70dB SINAD and -77dB THD at 50kHz input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit, two's-complement output with no missing codes over temperature |
| Conversion Time | 2.6µs (13 clock cycles at 5MHz), enabling 333ksps sustained throughput |
| Analog Input Range | ±5V bipolar, overvoltage tolerant to ±15V - simplifies front-end protection design |
| Reference Output | -5.00V buried-zener, ±25ppm/°C drift, requires 0.1µF || 22µF AGND bypass |
| Dynamic Performance | 70dB SINAD, -77dB THD (first five harmonics), 77dB SFDR at 50kHz |
| Power Supply | +4.75V to +5.25V (VDD), -10.8V to -15.75V (VSS); 210mW typical dissipation |
| Operating Temperature | -40°C to +85°C - qualified for industrial embedded and telecom equipment |
Pinout & Package
MAX122ACWG+ is housed in a 24-pin wide SO (SOIC-W) RoHS-compliant package with standard 0.3-inch body width and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MODE) | Mode configuration input | Hardwired to VDD for INT output, DGND for BUSY output, or left open for single-conversion BUSY mode |
| 2 (VSS) | Negative power supply | Accepts -10.8V to -15.75V; supplies internal reference and analog circuitry |
| 3 (VDD) | Positive power supply | Accepts +4.75V to +5.25V; powers digital logic and output drivers |
| 4 (AIN) | Analog input | ±5V bipolar input with 6kΩ || 10pF impedance and ±15V fault tolerance |
| 5 (VREF) | Reference output | -5.00V zener reference; must be bypassed to AGND with 0.1µF || 22µF capacitors |
| 6 (AGND) | Analog ground | Separate ground return for analog section; tied to DGND only at single-point supply |
| 7–11, 13–19 (D11–D0) | Data outputs | Three-state, TTL/CMOS-compatible 12-bit bus (D11 MSB to D0 LSB) |
| 12 (DGND) | Digital ground | Ground return for digital I/O; isolated from AGND except at supply source |
| 20 (CONVST) | Convert start | Falling-edge-triggered; initiates conversion and places T/H into hold mode |
| 21 (CLKIN) | System clock input | 0.1MHz–5MHz TTL/CMOS clock; determines conversion timing and throughput |
| 22 (INT/BUSY) | Status output | Configurable as interrupt (low pulse on completion) or busy (low during conversion) |
| 23 (CS) | Chip select | Active-low enable for data outputs; falling edge can initiate conversion when RD and CONVST are low |
| 24 (RD) | Read strobe | Active-low read control; enables outputs and can trigger conversion in conjunction with CS/CONVST |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | 350ns acquisition time eliminates need for external hold capacitor and reduces board space |
| Bipolar ±5V input | Supports direct connection to op-amp stages without level-shifting circuitry |
| Five interface modes | Enables seamless integration with µPs (with/without wait states), FIFOs, or DMA-based systems |
| Low-noise -5V reference | 20ppm/°C drift (typical) and 70dB SINAD enable precision measurements in noisy environments |
| TTL/CMOS compatibility | Eliminates level-shifter requirements for 5V µP buses and simplifies timing validation |
Applications
| Digital Signal Processing | Audio and Telecom Processing |
|---|---|
Use Scenario: Real-time spectral analysis of baseband signals in cellular infrastructure equipment using FFT-based algorithms. IC Role / Device Role / Timing Role: High-throughput ADC capturing 333k samples/sec with 70dB SINAD to preserve signal fidelity for downstream DSP. Use Value: Enables accurate detection of adjacent-channel interference and modulation quality metrics without external amplification or scaling. | Use Scenario: Digitizing line-level audio inputs in VoIP gateways and DSLAM voice cards operating across -40°C to +85°C. IC Role / Device Role / Timing Role: Bipolar ±5V input interface accepting transformer-coupled or op-amp buffered signals with minimal external components. Use Value: Eliminates input DC-blocking capacitors and gain-setting resistors, reducing BOM count and thermal drift sensitivity. |
| Spectrum Analysis | Data Logging Systems |
Use Scenario: Portable RF spectrum analyzers requiring battery-efficient, high-SFDR digitization of 0–1.5MHz bandwidth signals. IC Role / Device Role / Timing Role: ADC providing 77dB SFDR and 1.5MHz full-power input bandwidth for alias-free capture of wideband IF signals. Use Value: Supports direct sampling of first IF stages without anti-alias filtering complexity, lowering system latency and component cost. | Use Scenario: Industrial environmental monitoring nodes logging temperature, pressure, and vibration waveforms over extended periods. IC Role / Device Role / Timing Role: Low-power 210mW ADC operating in continuous-conversion mode (MODE = DGND) synchronized to external clock. Use Value: Reduces µP interrupt overhead via BUSY-driven polling or FIFO buffering, extending battery life in wireless sensor nodes. |
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 |
|---|---|---|---|
| ADS7800U | 12-bit, 1.25µs conversion, ±10V input range, single +5V supply only | Requires external reference and level-shifting for ±5V bipolar signals | Preferred where single-supply operation and higher speed outweigh bipolar input convenience |
| AD7892BRZ | 12-bit, 2.2µs conversion, ±10V input, 5V-only supply, SPI interface | Lacks parallel µP interface and integrated reference; needs external clock generator | Chosen for space-constrained designs needing serial interface and lower pin count |
Compared with ADS7800U and AD7892BRZ, the MAX122ACWG+ uniquely integrates a -5V reference, supports true bipolar ±5V input without external components, and offers five flexible µP interface modes - making it optimal for industrial data acquisition where analog simplicity and µP compatibility are critical.
Availability
MAX122ACWG+ is available at Aetrix Electronics and suitable for digital signal processing, audio and telecom processing, and spectrum analysis requiring stable component supply across industrial temperature ranges.
Supply support for MAX122ACWG+ 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 U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs for industrial, communications, and computing markets.
The MAX120/MAX122 family was engineered for high-speed, precision data acquisition in µP-based systems - delivering integrated track/hold, reference, and flexible parallel interfacing in a single 24-pin package.
FAQ
What is the maximum clock frequency supported by the MAX122ACWG+?
The MAX122ACWG+ accepts TTL/CMOS-compatible clock inputs from 0.1MHz to 5MHz. At 5MHz, it achieves its rated 2.6µs conversion time and 333ksps throughput. Operation above 5MHz is not guaranteed and may result in timing violations or missing codes. The clock must meet rise/fall time specifications (tr/tf ≤ 5ns) and be referenced to DGND.
Does the MAX122ACWG+ require external components for basic operation?
Yes - the MAX122ACWG+ requires decoupling capacitors on VDD, VSS, and VREF pins: 0.1µF ceramic + 22µF low-ESR electrolytic on VREF-to-AGND, plus 0.1µF ceramics on VDD-to-DGND and VSS-to-AGND. No external hold capacitor, reference, or level-shifters are needed due to its integrated track/hold and -5V zener reference.
How does the MODE pin configure the INT/BUSY output on the MAX122ACWG+?
On the MAX122ACWG+, the MODE pin selects INT/BUSY behavior: tied to VDD configures it as an interrupt output (active-low pulse upon conversion completion); tied to DGND or left open configures it as a busy output (low during conversion, high when data is ready). This setting directly affects µP polling or interrupt service routine design.
What is the input impedance and overvoltage tolerance of the MAX122ACWG+ analog input?
The MAX122ACWG+ analog input (AIN) exhibits 6kΩ resistance in parallel with 10pF capacitance. It accepts ±5V bipolar signals and is overvoltage tolerant to ±15V relative to AGND - protecting against transient surges without external clamping diodes in many industrial sensor interface applications.
Can the MAX122ACWG+ operate in continuous-conversion mode, and how is it enabled?
Yes - the MAX122ACWG+ supports continuous-conversion mode (Mode 5) when MODE, CONVST, RD, and CS are all tied to DGND. In this mode, it performs back-to-back conversions at 14-clock-cycle intervals (2.8µs at 5MHz), delivering sustained 333ksps output with INT/BUSY rising edge indicating data validity - ideal for FIFO or DMA-based streaming.
MAX122ACWG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX122ACWG+ FAQ
1.How can I place an order for MAX122ACWG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX122ACWG+ 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 MAX122ACWG+ reliable?
The price and inventory of MAX122ACWG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX122ACWG+ is usually 5 days.
3.What payment methods are accepted for MAX122ACWG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX122ACWG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX122ACWG+?
MAX122ACWG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX122ACWG+ 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 MAX122ACWG+?
For technical support, including MAX122ACWG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX122ACWG+ requirements.
6.How does Aetrix verify that MAX122ACWG+ is sourced from the original manufacturer or authorized distributors?
All MAX122ACWG+ 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 MAX122ACWG+ meets industry standards.
7.What is the process for return or replacement of MAX122ACWG+?
All MAX122ACWG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX122ACWG+, 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 MAX122ACWG+ part is unused and in its original packaging.
Return procedure for MAX122ACWG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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