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Analog Devices Inc./Maxim Integrated MAX122AENG
- Part No.:
- MAX122AENG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX122AENG.pdf
- Description:
- IC ADC 12BIT SAR 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,460
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Product details
Overview
The MAX122AENG from Maxim Integrated is a 12-bit, 333ksps BiCMOS sampling analog-to-digital converter with integrated track/hold and -5V internal reference, designed for high-speed bipolar data acquisition in industrial and telecom signal chains. It operates from ±5V analog input range (overvoltage tolerant to ±15V), consumes 210mW, and accepts 0.1MHz–5MHz TTL-compatible clock inputs.
For engineers reviewing the MAX122AENG datasheet, MAX122AENG pinout, MAX122AENG application, or MAX122AENG equivalent, this page delivers verified electrical specs, mode-specific timing behavior, true two's-complement output format, real-world FIFO interfacing guidance, and validated alternatives for ±5V, 333ksps ADC replacement in spectrum analysis, audio processing, and data logging systems.
Technical Context
The MAX122AENG implements successive approximation architecture with an on-chip track/hold featuring 350ns acquisition time and 30ps aperture jitter. Its internal -5V buried-zener reference provides ±25ppm/°C drift and supports external overdrive between -5.05V and -5.10V with ≥5mA sink capability.
It supports five distinct interface modes-including continuous-conversion (mode 5), full-control (mode 1), and ROM mode (mode 4)-all requiring only passive decoupling components. Digital I/Os are TTL/CMOS compatible, and conversion start is triggered by falling edges on CONVST, RD, or CS depending on configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes over temperature |
| Throughput Rate | 333ksps at 5MHz clock; fixed 2.6µs conversion time |
| Analog Input Range | ±5V bipolar, overvoltage tolerant to ±15V |
| Reference Output | -5.00V buried-zener, ±25ppm/°C drift, requires 22µF || 0.1µF bypass |
| Power Dissipation | 210mW typical at VDD = +5V, VSS = -12V, VAIN = 0V |
| SINAD | 70dB min at 50kHz input (MAX122BC/BE grade) |
| THD | -77dB max (first five harmonics) at +25°C |
| Aperture Jitter | 30ps typical - directly limits SNR at high input frequencies |
Pinout & Package
MAX122AENG is housed in a 24-pin narrow plastic DIP package (PDIP), RoHS-compliant, rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MODE | Mode configuration input | Hardwired to VDD for INT output; open or DGND for BUSY output; DGND enables continuous-conversion mode |
| 2 VSS | Negative power supply | Accepts -10.8V to -15.75V; must be decoupled to AGND with 0.1µF + 10µF |
| 3 VDD | Positive power supply | +4.75V to +5.25V; bypassed to AGND with 0.1µF + 10µF |
| 4 AIN | Analog input | ±5V bipolar input with 6kΩ || 10pF impedance; tolerant to ±15V transients |
| 5 VREF | Internal reference output | -5.00V zener reference; requires 22µF electrolytic || 0.1µF ceramic to AGND |
| 6 AGND | Analog ground | Separate ground plane required; tied to DGND only at single low-impedance point |
| 7–11,13–19 D11–D0 | Three-state digital outputs | 12-bit two's-complement data bus; TTL/CMOS compatible; 75ns access time |
| 12 DGND | Digital ground | Must be isolated from AGND except at star ground point |
| 20 CONVST | Convert start trigger | Falling-edge initiated; starts T/H hold and SAR conversion sequence |
| 21 CLKIN | System clock input | 0.1MHz–5MHz TTL-compatible; determines conversion rate and timing precision |
| 22 INT/BUSY | Status indicator | Configurable as interrupt (MODE=VDD) or busy flag (MODE=open/DGND) |
| 23 CS | Chip select | Active-low; enables outputs when RD is low; initiates conversion if CONVST and RD also low |
| 24 RD | Read strobe | Active-low; enables outputs when CS is low; initiates conversion if CONVST and CS also low |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates need for external hold capacitor; 350ns acquisition time enables 333ksps throughput |
| Bipolar ±5V input | Direct interface to op-amp stages without level-shifting; ±15V overvoltage tolerance protects against transient faults |
| Five configurable interface modes | Supports µP wait-state, FIFO buffering, DMA, and stand-alone operation without firmware overhead |
| Low-noise -5V reference | 25ppm/°C drift ensures stable full-scale accuracy across industrial temperature range |
| TTL/CMOS-compatible I/O | Direct connection to 8051, Z80, or FPGA without level translators or buffers |
| Two's-complement output format | Native signed integer representation simplifies DSP math and eliminates post-conversion sign extension |
Applications
| Audio Signal Digitization | Spectrum Analyzer Front-End |
|---|---|
Use Scenario: Digitizing line-level or microphone-preamp outputs in real-time audio analyzers and voice codecs. IC Role / Device Role / Timing Role: Primary ADC capturing 50kHz bandwidth signals with <70dB SINAD and -77dB THD. Use Value: Enables accurate spectral decomposition without external gain/offset trimming due to guaranteed no-missing-codes performance. | Use Scenario: Sampling RF IF outputs (e.g., 10.7MHz or 455kHz) after bandpass filtering in portable spectrum analyzers. IC Role / Device Role / Timing Role: High-fidelity digitizer providing 333ksps sample stream for FFT-based frequency-domain analysis. Use Value: 30ps aperture jitter preserves phase coherence across bins; ±5V input accommodates variable IF amplifier gains. |
| Industrial Data Logger | Telecom Channel Monitor |
Use Scenario: Recording sensor outputs (temperature, pressure, vibration) in unattended field-deployed loggers. IC Role / Device Role / Timing Role: Low-power, wide-temp ADC acquiring synchronized multi-channel samples via shared CLKIN and CONVST. Use Value: 210mW dissipation allows extended battery life; -40°C to +85°C rating ensures reliability in outdoor enclosures. | Use Scenario: Monitoring analog channel parameters (gain, distortion, noise floor) in DSLAM or base station line cards. IC Role / Device Role / Timing Role: Embedded diagnostic ADC sampling analog test points under system control via µP interface. Use Value: Five interface modes allow seamless integration into existing µP buses without custom timing logic or wait states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, 300–500ksps ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7800U | 12-bit, 1.25MSPS, single-supply (+5V only), no internal reference | Requires external ±5V generation and reference; higher speed but less integrated | Choose when >500ksps throughput is mandatory and board space permits external support circuitry |
| MAX125ACNG+ | 14-bit, 100ksps, dual simultaneous-sampling, ±10V input range | Lower throughput but higher resolution and dual-channel sync capture | Choose when measuring correlated analog pairs (e.g., current/voltage) with better than 12-bit precision |
Compared with ADS7800U and MAX125ACNG+, the MAX122AENG offers optimal balance of integration (on-chip ±5V reference, T/H), industrial temperature range, and proven 333ksps performance-making it ideal for cost-sensitive, space-constrained designs where external component count must be minimized.
Availability
MAX122AENG is available at Aetrix Electronics and suitable for high-speed data acquisition, telecom channel monitoring, and industrial data logging systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX122AENG 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 computing applications.
The MAX120/MAX122 product line was engineered for precision, high-throughput data acquisition in systems demanding integrated references, robust bipolar input handling, and flexible µP interfacing-targeting test equipment, medical instrumentation, and automated measurement platforms.
FAQ
What is the maximum clock frequency supported by the MAX122AENG?
The MAX122AENG supports a maximum clock frequency of 5MHz, which is lower than the MAX120's 8MHz limit. This 5MHz ceiling ensures stable 2.6µs conversion time and 333ksps throughput across its full -40°C to +85°C operating range. Exceeding 5MHz may cause timing violations or missing codes, particularly at temperature extremes.
Does the MAX122AENG require external components for basic operation?
Yes - the MAX122AENG requires external decoupling capacitors: 0.1µF + 10µF on VDD and VSS, plus 22µF || 0.1µF on VREF to AGND. No external hold capacitor, op-amps, or reference ICs are needed. These values are mandatory for specified noise performance, reference stability, and power-supply rejection per the MAX122AENG datasheet.
How does the MODE pin affect the INT/BUSY output behavior in the MAX122AENG?
In the MAX122AENG, the MODE pin configures INT/BUSY as either an interrupt (MODE = VDD) or busy flag (MODE open or tied to DGND). In interrupt mode, INT/BUSY pulses low upon conversion completion and returns high after data read. In busy mode, it stays low during conversion and goes high only when data is valid and ready to read - critical for µP wait-state synchronization.
Can the MAX122AENG interface directly with a FIFO buffer without a microprocessor?
Yes - the MAX122AENG supports stand-alone and continuous-conversion modes (modes 2 and 5) that enable direct FIFO interfacing. In mode 5 (CONVST = RD = CS = MODE = DGND), it performs autonomous conversions at 333ksps and drives data continuously onto D11–D0, with INT/BUSY rising to signal new data - eliminating µP interrupt overhead entirely.
What is the significance of the "A" in MAX122AENG's part number?
The "A" in MAX122AENG denotes the accuracy grade: ±1 LSB integral nonlinearity (INL) over temperature, matching the MAX120C/E and MAX122BC/BE specifications. This grade guarantees no missing codes and tighter DC accuracy than the "C" or "E" variants alone, making MAX122AENG suitable for applications requiring consistent linearity across the full industrial temperature range.
MAX122AENG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX122AENG FAQ
1.How can I place an order for MAX122AENG through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX122AENG 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 MAX122AENG reliable?
The price and inventory of MAX122AENG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX122AENG is usually 5 days.
3.What payment methods are accepted for MAX122AENG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX122AENG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX122AENG?
MAX122AENG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX122AENG 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 MAX122AENG?
For technical support, including MAX122AENG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX122AENG requirements.
6.How does Aetrix verify that MAX122AENG is sourced from the original manufacturer or authorized distributors?
All MAX122AENG 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 MAX122AENG meets industry standards.
7.What is the process for return or replacement of MAX122AENG?
All MAX122AENG units undergo pre-shipment inspection (PSI). If there is an issue with MAX122AENG, 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 MAX122AENG part is unused and in its original packaging.
Return procedure for MAX122AENG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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