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Analog Devices Inc./Maxim Integrated MAX122BCWG+
- Part No.:
- MAX122BCWG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
MAX122BCWG+.pdf
- Description:
- IC ADC 12BIT 333KSPS 24-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,052
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Product details
Overview
MAX122BCWG+ 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 data acquisition in ±5V bipolar input systems. It operates from 0.1MHz to 5MHz clock, consumes 210mW, and delivers 69dB SINAD and -75dB THD at 50kHz input.
For engineers reviewing the MAX122BCWG+ datasheet, MAX122BCWG+ pinout, MAX122BCWG+ application, or MAX122BCWG+ equivalent, key selection considerations include its 24-pin wide SO package, TTL/CMOS-compatible parallel interface, continuous-conversion mode support, and ±5V overvoltage-tolerant analog input (±15V).
Technical Context
The MAX122BCWG+ implements successive approximation architecture with an internal 350ns acquisition-time track/hold and a low-drift -5V reference. Its conversion time is fixed at 2.6µs (13–14 clock cycles), enabling 333ksps throughput under 5MHz clock operation.
It supports five microprocessor interface modes-including full-control (mode 1), stand-alone (mode 2), slow-memory (mode 3), ROM (mode 4), and continuous-conversion (mode 5)-with configurable INT/BUSY output via MODE pin and three-state 12-bit parallel data bus (D11–D0) compatible with 16-bit systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit, two's-complement output with no missing codes over temperature |
| Throughput Rate | 333ksps - enables real-time spectral analysis and audio digitization at 50kHz input bandwidth |
| Conversion Time | 2.6µs - deterministic latency critical for synchronized multi-channel sampling |
| Analog Input Range | ±5V bipolar - supports industrial sensor interfaces without external level-shifting |
| Reference Output | -5.00V buried-zener - stable internal reference requiring only 0.1µF || 22µF bypass at VREF |
| Power Supply | +5V (VDD), -12V to -15.75V (VSS) - dual-rail operation for true bipolar signal handling |
| SINAD / THD | 69dB / -75dB - meets requirements for telecom voice encoding and medium-fidelity audio capture |
Pinout & Package
MAX122BCWG+ is housed in a 24-pin wide SO (Small Outline) package, RoHS-compliant and lead-free, with 0.300-inch body width and standard JEDEC MS-013AC footprint.
| 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 -12V to -15.75V - supplies internal DAC and reference circuitry; requires local 0.1µF bypass |
| 3 (VDD) | Positive power supply | +4.75V to +5.25V - powers digital logic and output drivers; TTL/CMOS compatible |
| 4 (AIN) | Analog input | ±5V bipolar input with ±15V overvoltage tolerance - connects directly to transducer outputs without clamping diodes |
| 5 (VREF) | Reference output | -5.00V zener reference - must be bypassed to AGND with 0.1µF ceramic + 22µF electrolytic (ESR ≤100mΩ) |
| 6 (AGND) | Analog ground | Separate ground return for analog section - must tie to DGND at single point near power supply |
| 7–11, 13–19 (D11–D0) | Data outputs | Three-state, 12-bit parallel bus (MSB D11 to LSB D0) - directly interfaces to 16-bit µP data buses without glue logic |
| 12 (DGND) | Digital ground | Dedicated ground for digital I/O - prevents noise coupling into analog path when split-plane layout is used |
| 20 (CONVST) | Convert start | Falling-edge triggered - initiates conversion and places T/H into hold mode; asynchronous to CLKIN |
| 21 (CLKIN) | Master clock input | TTL-compatible 0.1–5MHz input - defines conversion timing; aperture jitter is 30ps RMS |
| 22 (INT/BUSY) | Status output | Configurable as interrupt (low pulse on completion) or busy (low during conversion) - synchronizes µP read timing |
| 23 (CS) | Chip select | Active-low enable - when low with RD, enables data outputs; with CONVST low, triggers conversion on CS fall |
| 24 (RD) | Read strobe | Active-low read control - latches valid data onto D11–D0; used with CS to initiate conversion in some modes |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | 350ns acquisition time eliminates need for external sample-hold IC or capacitor |
| Bipolar ±5V input | Supports direct connection to industrial sensors, audio line-level signals, and op-amp outputs without level-shifting |
| Five interface modes | Enables flexible integration - from µP-controlled burst acquisition (mode 1) to FIFO-driven continuous streaming (mode 5) |
| Low-noise -5V reference | 20ppm/°C drift and 5mA sink capability allow stable precision measurement without external reference IC |
| TTL/CMOS compatibility | Eliminates level translators - all digital I/O meet VIH ≥2.4V and VIL ≤0.8V across temperature |
Applications
| Digital Signal Processing | Audio and Telecom Processing |
|---|---|
Use Scenario: Real-time FFT-based spectrum analysis of vibration signals in predictive maintenance systems. IC Role / Device Role / Timing Role: ADC front-end capturing 333k samples/sec with 69dB SINAD to resolve harmonic content up to 150kHz. Use Value: Enables detection of bearing faults via amplitude modulation sidebands without oversampling or external decimation filters. | Use Scenario: Digitizing analog voice channels in VoIP gateways and PBX line cards. IC Role / Device Role / Timing Role: High-fidelity 12-bit sampling at 333ksps with -75dB THD preserves speech intelligibility and tone quality. Use Value: Meets ITU-T G.711 PCM encoding requirements while reducing BOM count by integrating reference and T/H. |
| Speech Recognition and Synthesis | High-Speed Data Acquisition |
Use Scenario: Edge-based keyword spotting in smart speaker microcontroller units with analog mic preamp output. IC Role / Device Role / Timing Role: Low-latency 2.6µs conversion with configurable BUSY output allows deterministic µP polling without interrupts. Use Value: Supports sub-10ms wake-word detection pipelines using on-chip FIR filtering and feature extraction. | Use Scenario: Multi-channel oscilloscope front-end acquiring transient waveforms from power electronics switching nodes. IC Role / Device Role / Timing Role: ±15V overvoltage-tolerant AIN pin accepts direct connection to isolated current-sense amplifiers. Use Value: Eliminates external protection components and enables 12-bit resolution at 333ksps without signal degradation. |
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; single +5V supply; no internal reference | Requires external reference and level-shifting for ±5V inputs; suited for space-constrained PCBs with serial interface preference | Select when board area is limited and µP has SPI but lacks parallel bus; verify external reference stability meets system accuracy needs |
| AD7892BRZ | 12-bit, 600ksps SAR ADC; ±10V input range; internal 2.5V reference; 24-pin SOIC | Wider input range but unipolar reference; higher power (300mW); no built-in track/hold | Choose for higher throughput and extended voltage range where external T/H is acceptable; confirm layout accommodates separate T/H decoupling |
Compared with ADS7822U and AD7892BRZ, the MAX122BCWG+ uniquely integrates a -5V reference and track/hold in a 24-pin wide SO package, delivering 333ksps with ±5V bipolar input support and five flexible interface modes - making it optimal for µP-based data loggers and telecom signal chains requiring minimal external components.
Availability
MAX122BCWG+ 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 packaging.
Supply support for MAX122BCWG+ 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, communications, and consumer applications.
The MAX120/MAX122 product line delivers high-speed, low-power 12-bit ADCs with integrated references and track/hold for applications demanding compact, reliable digitization of bipolar analog signals without external support components.
FAQ
What is the maximum clock frequency supported by the MAX122BCWG+?
The MAX122BCWG+ accepts clock frequencies from 0.1MHz to 5MHz. Operation above 5MHz is not guaranteed and may result in invalid conversions or timing violations. The 5MHz limit ensures stable 2.6µs conversion time and compliance with specified dynamic performance metrics including 69dB SINAD and -75dB THD at 50kHz input.
Does the MAX122BCWG+ require external components for basic operation?
Yes - the MAX122BCWG+ requires external decoupling capacitors: 0.1µF ceramic + 22µF electrolytic (ESR ≤100mΩ) on VREF to AGND, plus 0.1µF bypass capacitors on VDD and VSS to AGND. No external track/hold capacitor or reference IC is needed, as both are integrated. These components ensure reference stability, low-noise operation, and proper power-supply rejection.
Can the MAX122BCWG+ interface directly with a microprocessor without wait states?
Yes - the MAX122BCWG+ features data-access and bus-release timing compatible with most popular µPs (e.g., 8051, ARM Cortex-M) without wait states in full-control mode (mode 1). Its 75ns data-access time and 65ns bus-relinquish time meet timing requirements of common 16-bit buses. For slower µPs, slow-memory mode (mode 3) uses BUSY as a wait input.
What is the analog input overvoltage tolerance of the MAX122BCWG+?
The MAX122BCWG+ analog input (AIN) is rated for ±15V overvoltage tolerance relative to AGND, exceeding its specified ±5V operating range. This protects the internal comparator and sampling switch during fault conditions or transients, eliminating need for external clamping diodes in industrial sensor interfaces where ±10V spikes may occur.
How does the MODE pin configure the INT/BUSY output on the MAX122BCWG+?
The MODE pin configures the INT/BUSY output function: tied to VDD → INT output (active-low pulse on conversion completion); tied to DGND or left open → BUSY output (active-low during conversion, returns high when data is ready). This selection determines whether the µP uses edge-triggered interrupts or level-sensitive polling, directly impacting firmware design for real-time acquisition loops.
MAX122BCWG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
MAX122BCWG+ FAQ
1.How can I place an order for MAX122BCWG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX122BCWG+ 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 MAX122BCWG+ reliable?
The price and inventory of MAX122BCWG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX122BCWG+ is usually 5 days.
3.What payment methods are accepted for MAX122BCWG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX122BCWG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX122BCWG+?
MAX122BCWG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX122BCWG+ 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 MAX122BCWG+?
For technical support, including MAX122BCWG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX122BCWG+ requirements.
6.How does Aetrix verify that MAX122BCWG+ is sourced from the original manufacturer or authorized distributors?
All MAX122BCWG+ 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 MAX122BCWG+ meets industry standards.
7.What is the process for return or replacement of MAX122BCWG+?
All MAX122BCWG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX122BCWG+, 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 MAX122BCWG+ part is unused and in its original packaging.
Return procedure for MAX122BCWG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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