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Analog Devices Inc./Maxim Integrated MAX122AEWG
- Part No.:
- MAX122AEWG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX122AEWG.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:573
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Product details
Overview
MAX122AEWG from Maxim Integrated is a 12-bit, 333ksps BiCMOS sampling analog-to-digital converter with integrated track/hold and -5V buried-zener reference. It operates from ±5V analog input range (overvoltage tolerant to ±15V), accepts 0.1–5MHz TTL-compatible clock input, and delivers 70dB min SINAD and -77dB max THD at 50kHz input. It targets high-speed data acquisition systems requiring precise bipolar signal digitization.
For engineers reviewing the MAX122AEWG datasheet, MAX122AEWG pinout, MAX122AEWG application, or MAX122AEWG equivalent, key selection considerations include its 2.6µs conversion time, 24-pin wide SO package, ±5V input compliance, TTL/CMOS-compatible µP interface, and support for five distinct operational modes including continuous-conversion and FIFO-coupled configurations.
Technical Context
The MAX122AEWG employs successive approximation architecture with an on-chip track/hold circuit featuring 350ns acquisition time and 30ps typical aperture jitter. Its internal -5V reference exhibits ±25ppm/°C drift over 0°C to +70°C and requires 22µF || 0.1µF bypassing at VREF to AGND.
It supports five asynchronous µP interface modes (full-control, stand-alone, slow-memory, ROM, and continuous-conversion), with INT/BUSY output configurable via MODE pin. Digital I/Os are TTL/CMOS compatible, and conversion timing is synchronized to CLKIN rising edge with fixed 13-clock-cycle operation when properly aligned.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with no missing codes over temperature |
| Conversion Time | 2.6µs - enables 333ksps throughput at 5MHz clock, suitable for real-time spectrum analysis |
| Analog Input Range | ±5V - supports bipolar signals directly; overvoltage tolerant to ±15V without damage |
| SINAD | 70dB (min) - ensures ≥11.3 effective number of bits (ENOB) for clean signal reconstruction |
| THD | -77dB (max) - limits harmonic distortion in audio and telecom processing applications |
| Reference Voltage | -5.00V (typ) - low-drift buried-zener source enabling accurate full-scale calibration |
| Power Dissipation | 210mW - enables compact thermal design in embedded data loggers and DSP front-ends |
Pinout & Package
MAX122AEWG is housed in a 24-pin wide SO (Small Outline) package with gull-wing leads, RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MODE | Configures INT/BUSY output behavior: VDD = interrupt mode; open/DGND = busy mode; critical for µP handshake timing |
| 2 | VSS | Negative supply rail (–12V to –15.75V) - powers analog core and reference; must be decoupled independently |
| 3 | VDD | Positive supply rail (+4.75V to +5.25V) - powers digital logic and output buffers; separate from analog ground path |
| 4 | AIN | Analog input terminal - accepts ±5V bipolar signals with 6kΩ || 10pF input impedance; tolerant to ±15V transients |
| 5 | VREF | -5V reference output - requires 22µF || 0.1µF bypass to AGND; sinks up to 5mA for external loading |
| 6 | AGND | Analog ground reference - must be isolated from DGND except at single-point power supply tie; critical for noise rejection |
| 7–11, 13–19 | D11–D0 | 12-bit three-state data outputs - MSB-first two's-complement format; 75ns access time enables direct µP bus interfacing |
| 12 | DGND | Digital ground - return path for logic I/Os; must be separated from AGND to prevent digital noise coupling into analog path |
| 20 | CONVST | Convert start input - falling-edge triggered; initiates T/H hold and SAR conversion; asynchronous to CLKIN |
| 21 | CLKIN | TTL-compatible clock input - 0.1–5MHz range defines conversion rate; rising edge clocks SAR decisions |
| 22 | INT/BUSY | Status output - polarity and function determined by MODE pin; indicates conversion completion or active state |
| 23 | CS | Chip-select input (active-low) - enables data outputs when RD is low; can initiate conversion with CONVST/RD |
| 24 | RD | Read input (active-low) - enables data outputs when CS is low; can initiate conversion with CONVST/CS |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates need for external hold capacitor; 350ns acquisition time enables rapid successive sampling |
| Bipolar ±5V input range | Directly interfaces with industrial sensor outputs and audio line-level signals without level-shifting circuitry |
| Five µP interface modes | Supports diverse system architectures - from wait-state-capable µPs to FIFO/DMA-based standalone acquisition |
| Low-noise -5V reference | ±25ppm/°C drift and 70dB SINAD ensure stable full-scale accuracy across commercial temperature range |
| TTL/CMOS-compatible I/O | Direct connection to 5V logic families without level translators; simplifies PCB layout and reduces BOM count |
| Overvoltage tolerance | Withstands ±15V on AIN relative to AGND - protects against transient coupling in noisy industrial environments |
Applications
| Digital Signal Processing | Audio and Telecom Processing |
|---|---|
Use Scenario: Real-time spectral analysis of RF or vibration signals using FFT-based algorithms. IC Role / Device Role / Timing Role: High-speed ADC front-end capturing 333k samples/sec with low THD and jitter to preserve signal integrity. Use Value: 70dB SINAD and 30ps aperture jitter minimize frequency-domain noise floor, enabling detection of weak spectral components. |
Use Scenario: Digitizing line-level analog audio or telecom channel signals for VoIP gateways or baseband processing. IC Role / Device Role / Timing Role: Bipolar ±5V input interface converting AC-coupled signals with minimal gain/offset drift. Use Value: No missing codes over temperature and ±25ppm/°C reference drift ensure consistent dynamic range across operating conditions. |
| Speech Recognition Systems | High-Speed Data Logging |
Use Scenario: Capturing voice waveforms for feature extraction in embedded speech recognition engines. IC Role / Device Role / Timing Role: Low-power 12-bit ADC providing sufficient ENOB for MFCC computation without oversampling. Use Value: 210mW power dissipation and 333ksps throughput enable battery-aware portable voice capture subsystems. |
Use Scenario: Recording sensor data (e.g., strain gauges, thermocouples) in industrial monitoring equipment. IC Role / Device Role / Timing Role: Precision ADC with integrated reference and robust ±15V input tolerance for harsh EMI environments. Use Value: Eliminates external reference and buffer components; 24-pin SO package supports automated assembly and field reliability. |
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 |
|---|---|---|---|
| MAX120EWG+ | 1.6µs conversion time (500ksps), 0.1–8MHz clock range, same pinout and reference | Higher throughput required; less demanding on aperture jitter (30ps identical) | Select MAX120EWG+ when system clock exceeds 5MHz and >333ksps sampling is needed |
| ADS7800U | 12-bit, 1MSPS, single-supply (+5V only), no internal reference, requires external REF | Single-rail systems; lower power (120mW); lacks bipolar input and integrated T/H | Choose ADS7800U for cost-sensitive, low-voltage designs where external reference and signal conditioning are acceptable |
Compared with MAX122AEWG, MAX120EWG+ offers higher speed but identical packaging and interface compatibility, while ADS7800U trades integrated features for lower power and single-supply operation - making it suitable only where external support circuitry is already present.
Availability
MAX122AEWG is available at Aetrix Electronics and suitable for digital-signal processing, audio and telecom processing, and high-speed data acquisition requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for MAX122AEWG 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 high-frequency ICs for industrial, communications, and computing applications.
The MAX120/MAX122 product line delivers complete 12-bit ADC solutions with integrated track/hold and reference for systems needing fast, accurate bipolar signal digitization without external support components.
FAQ
What is the maximum clock frequency supported by MAX122AEWG?
The MAX122AEWG supports a maximum clock frequency of 5MHz, as specified in its Electrical Characteristics table. This limit ensures reliable 2.6µs conversion time and 333ksps throughput. Operating above 5MHz may cause timing violations or incomplete conversions. The MAX122AEWG datasheet explicitly states fCLK ≤ 5MHz for all five operational modes, unlike the MAX120 which supports up to 8MHz.
Does MAX122AEWG require external components for basic operation?
Yes, the MAX122AEWG requires external decoupling capacitors: 0.1µF ceramic and 22µF electrolytic (ESR ≤ 100mΩ) between VREF and AGND, plus 0.1µF and 10µF bypasses on VDD and VSS to AGND. No external track/hold capacitor or reference is needed - these are fully integrated. All logic I/Os are TTL/CMOS compatible, eliminating level translators.
What does the 'AE' suffix indicate in MAX122AEWG?
The 'AE' suffix in MAX122AEWG denotes the commercial temperature grade (0°C to +70°C) and the wide SO package. Per Maxim's ordering information, 'A' = 0°C to +70°C, 'E' = wide SO package, and 'WG' = RoHS-compliant lead-free finish. This matches the MAX122AEWG's specified operating range and 24-pin wide SO footprint.
Can MAX122AEWG interface directly with a FIFO buffer?
Yes, the MAX122AEWG supports direct FIFO interfacing in stand-alone (Mode 2) and continuous-conversion (Mode 5) configurations. In Mode 5, it outputs new conversion results every 14 clock cycles with INT/BUSY rising edge signaling data validity - enabling seamless handoff to IDT7200 or similar FIFOs without µP intervention or wait states.
What is the analog input impedance of MAX122AEWG?
The MAX122AEWG presents an analog input impedance of approximately 6kΩ in parallel with 10pF, as confirmed in the "Detailed Description" section under "Analog Input Track/Hold". This value is constant during track mode and defines the driving requirement for source circuits - e.g., op-amp buffers must settle within 350ns to meet acquisition time.
MAX122AEWG 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:
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX122AEWG FAQ
1.How can I place an order for MAX122AEWG through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX122AEWG 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 MAX122AEWG reliable?
The price and inventory of MAX122AEWG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX122AEWG is usually 5 days.
3.What payment methods are accepted for MAX122AEWG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX122AEWG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX122AEWG?
MAX122AEWG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX122AEWG 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 MAX122AEWG?
For technical support, including MAX122AEWG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX122AEWG requirements.
6.How does Aetrix verify that MAX122AEWG is sourced from the original manufacturer or authorized distributors?
All MAX122AEWG 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 MAX122AEWG meets industry standards.
7.What is the process for return or replacement of MAX122AEWG?
All MAX122AEWG units undergo pre-shipment inspection (PSI). If there is an issue with MAX122AEWG, 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 MAX122AEWG part is unused and in its original packaging.
Return procedure for MAX122AEWG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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