My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX122ACNG+
- Part No.:
- MAX122ACNG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX122ACNG+.pdf
- Description:
- IC ADC 12BIT SAR 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,080
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX122ACNG+ from Maxim Integrated is a 12-bit, 333ksps BiCMOS 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, TTL/CMOS-compatible digital interface, and low-noise performance (70dB SINAD, -77dB THD).
For engineers reviewing the MAX122ACNG+ datasheet, MAX122ACNG+ pinout, MAX122ACNG+ application, or MAX122ACNG+ equivalent, this page delivers verified electrical specs, mode-configurable timing behavior, real-world FIFO interfacing guidance, and precise thermal and supply rejection characteristics per official Maxim documentation.
Technical Context
The MAX122ACNG+ employs successive approximation architecture with an internal 350ns acquisition-time track/hold and a -5V precision reference (±25ppm/°C drift). It operates with 0.1MHz–5MHz external TTL/CMOS clocks and supports five distinct interface modes-including continuous-conversion (mode 5) and full-control (mode 1)-via MODE, CONVST, RD, and CS pins.
Its analog input presents a 6kΩ || 10pF impedance, accepts ±5V bipolar signals with ±15V overvoltage tolerance, and delivers two's-complement output data with 75ns access time. Digital I/Os are fully TTL/CMOS compatible, and power supplies require separate analog/digital grounding with dedicated 22µF + 0.1µF VREF bypassing.
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 (ensures ≥11.3 effective bits at 50kHz input) |
| THD | -77dB max (dominated by 2nd–5th harmonics) |
| Reference Output | -5.00V ±2mV at +25°C, ±25ppm/°C drift |
| Power Dissipation | 210mW typical at VDD = +5V, VSS = -12V |
Pinout & Package
MAX122ACNG+ is housed in a 24-pin narrow plastic DIP (Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, and the package is RoHS-compliant and lead-free (+ suffix).
| 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 BUSY - determines interrupt signaling behavior |
| 2 (VSS) | Negative Power Supply | Accepts -10.8V to -15.75V; critical for reference stability and analog performance |
| 3 (VDD) | Positive Power Supply | Requires +4.75V to +5.25V; decoupling mandatory for noise-sensitive SAR operation |
| 4 (AIN) | Analog Input | ±5V bipolar input with 6kΩ || 10pF impedance; tolerant to ±15V transients |
| 5 (VREF) | Reference Output | -5.00V buried-zener source; requires 22µF || 0.1µF bypass to AGND for <100mΩ ESR |
| 6 (AGND) | Analog Ground | Must be isolated from DGND except at single-point supply return to minimize noise coupling |
| 7–11, 13–19 (D11–D0) | Data Outputs | Three-state, TTL/CMOS-compatible 12-bit bus; MSB-first two's-complement format |
| 12 (DGND) | Digital Ground | Separate return path for digital logic; tied to AGND only at power supply star point |
| 20 (CONVST) | Convert Start | Falling-edge triggered; initiates sampling and conversion sequence independently of RD/CS |
| 21 (CLKIN) | System Clock Input | 0.1MHz–5MHz TTL/CMOS clock; defines conversion timing and throughput rate |
| 22 (INT/BUSY) | Status Output | Configurable as interrupt (low pulse on completion) or busy flag (low during conversion) |
| 23 (CS) | Chip Select | Active-low enable for data outputs; combined with RD enables read or start new conversion |
| 24 (RD) | Read Strobe | Active-low; latches conversion result onto D11–D0 when CS is low |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Track/Hold | 350ns acquisition time eliminates need for external hold capacitor and reduces system component count |
| Bipolar ±5V Input | Direct interface to industrial sensors and audio line-level signals without external level-shifting circuitry |
| Five Interface Modes | Supports µP wait-state, FIFO/DMA, ROM-mapped, and continuous-sampling architectures without firmware changes |
| On-Chip -5V Reference | Stable ±25ppm/°C drift enables accurate DC-coupled measurements without external reference ICs |
| TTL/CMOS Compatibility | Eliminates level translators in 5V logic systems and ensures reliable timing with standard microprocessors |
Applications
| Industrial Data Acquisition | Audio Signal Processing |
|---|---|
Use Scenario: High-precision monitoring of motor phase currents, temperature sensor arrays, and vibration transducers in PLC-based control cabinets. IC Role / Device Role / Timing Role: ADC front-end capturing ±5V sensor outputs at 333ksps with synchronized trigger via CONVST for deterministic sampling windows. Use Value: Eliminates external reference and T/H components, reducing BOM cost and layout area while maintaining 12-bit linearity across 0°C to +70°C. | Use Scenario: Digitizing line-level stereo audio (±2.5V nominal) for real-time spectral analysis and dynamic range compression in broadcast equipment. IC Role / Device Role / Timing Role: Bipolar-input ADC operating in continuous-conversion mode (MODE = DGND), feeding dual-channel FIFO buffers for DMA-driven FFT processing. Use Value: 70dB SINAD and -77dB THD meet professional audio SNR requirements; 24-pin DIP simplifies prototyping and thermal management in analog-digital hybrid boards. |
| Spectrum Analyzer Front-End | Telecom Channel Monitoring |
Use Scenario: Capturing RF IF signals (e.g., 45MHz intermediate frequency) after downconversion in portable spectrum analyzers. IC Role / Device Role / Timing Role: High-speed sampling ADC using external 5MHz clock and full-control mode (mode 1) for precise trigger alignment with local oscillator phases. Use Value: Aperture jitter of 30ps and 1.5MHz full-power bandwidth preserve signal integrity up to Nyquist (166.5kHz), enabling accurate harmonic detection. | Use Scenario: Monitoring analog voice channel parameters (gain, distortion, noise floor) in carrier-class DSLAM line cards under varying temperature and load conditions. IC Role / Device Role / Timing Role: Stand-alone ADC (MODE = open, RD = CS = DGND) continuously streaming samples into memory-mapped buffers for real-time diagnostics. Use Value: Guaranteed no missing codes and ±1 LSB INL ensure measurement repeatability across -40°C to +85°C industrial temperature range. |
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 | 12-bit, 200ksps SAR ADC; SPI interface only; no internal reference or T/H; requires external -5V ref and sample clock | Best suited for space-constrained PCBs where serial interface reduces pin count; not drop-in due to different protocol and missing analog features | Select when system already uses SPI infrastructure and external reference is available; avoid if ±5V bipolar input or FIFO interfacing is required |
| MAX112ACNG+ | 12-bit, 500ksps variant with identical pinout, package, and feature set but rated for 0°C to +70°C and 8MHz clock support | Direct functional upgrade path where higher throughput is needed; shares same layout, firmware, and power design | Choose for applications needing >333ksps without changing hardware; verify clock source capability and thermal margin at 8MHz |
Compared with ADS7822U, MAX122ACNG+ integrates reference and T/H to reduce external components and simplify analog front-end design; compared with MAX112ACNG+, it trades 167ksps throughput for lower clock frequency compliance and tighter THD specification in telecom-grade signal chains.
Availability
MAX122ACNG+ is available at Aetrix Electronics and suitable for industrial data acquisition, audio signal processing, spectrum analyzer front-ends, and telecom channel monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX122ACNG+ 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, medical, and communications applications.
The MAX120/MAX122 product line delivers integrated, high-speed 12-bit ADCs optimized for systems demanding low-noise bipolar sampling, minimal external components, and flexible µP or FIFO interfacing in harsh environments.
FAQ
What is the maximum clock frequency supported by the MAX122ACNG+?
The MAX122ACNG+ supports a maximum clock frequency of 5MHz, as specified in its Electrical Characteristics table. This limit ensures stable 2.6µs conversion time and 333ksps throughput across the full operating temperature range. Exceeding 5MHz may cause timing violations, incomplete conversions, or degraded dynamic performance such as reduced SINAD. The MAX122ACNG+ datasheet explicitly states fCLK ≤ 5MHz for all five operational modes.
Does the MAX122ACNG+ require external components for basic operation?
Yes - the MAX122ACNG+ requires external decoupling capacitors on VDD, VSS, and VREF pins. Specifically, the VREF pin must be bypassed to AGND with a 22µF electrolytic capacitor (ESR ≤ 100mΩ) in parallel with a 0.1µF ceramic capacitor. Additional 0.1µF capacitors are recommended on VDD and VSS near the package. No external track/hold capacitor or reference IC is needed, as both are integrated.
How does the MODE pin configuration affect the INT/BUSY output behavior of the MAX122ACNG+?
When MODE is tied to VDD, INT/BUSY functions as an interrupt output: it pulses low upon conversion completion and returns high after data is read. When MODE is open or connected to DGND, INT/BUSY acts as a busy flag: it goes low at conversion start and remains low until data is valid and ready to read. This configuration directly determines µP polling vs. interrupt-driven software architecture for the MAX122ACNG+.
What is the analog input impedance and overvoltage tolerance of the MAX122ACNG+?
The MAX122ACNG+ analog input (AIN) exhibits a 6kΩ resistance in parallel with 10pF capacitance. It accepts ±5V bipolar signals and tolerates transient overvoltages up to ±15V relative to AGND without damage or latch-up, as confirmed in the Absolute Maximum Ratings table. This robustness allows direct connection to industrial sensors and line-level audio sources without external protection circuitry in most cases.
Can the MAX122ACNG+ operate with a single +5V supply?
No - the MAX122ACNG+ requires dual supplies: a positive supply (VDD = +4.75V to +5.25V) and a negative supply (VSS = -10.8V to -15.75V). This is necessary to bias the internal -5V buried-zener reference and support the ±5V analog input range. Attempting operation with only +5V will prevent proper reference generation, disable analog functionality, and likely violate absolute maximum ratings for VSS-to-DGND voltage.
MAX122ACNG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX122ACNG+ FAQ
1.How can I place an order for MAX122ACNG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX122ACNG+ 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 MAX122ACNG+ reliable?
The price and inventory of MAX122ACNG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX122ACNG+ is usually 5 days.
3.What payment methods are accepted for MAX122ACNG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX122ACNG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX122ACNG+?
MAX122ACNG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX122ACNG+ 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 MAX122ACNG+?
For technical support, including MAX122ACNG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX122ACNG+ requirements.
6.How does Aetrix verify that MAX122ACNG+ is sourced from the original manufacturer or authorized distributors?
All MAX122ACNG+ 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 MAX122ACNG+ meets industry standards.
7.What is the process for return or replacement of MAX122ACNG+?
All MAX122ACNG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX122ACNG+, 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 MAX122ACNG+ part is unused and in its original packaging.
Return procedure for MAX122ACNG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX122ACNG+ Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
