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Analog Devices Inc./Maxim Integrated MAX122BEAG
- Part No.:
- MAX122BEAG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX122BEAG.pdf
- Description:
- IC ADC 12BIT SAR 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,428
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Product details
Overview
The MAX122BEAG 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, TTL/CMOS-compatible digital interface, and low-noise performance (70dB SINAD, -77dB THD).
For engineers reviewing the MAX122BEAG datasheet, MAX122BEAG pinout, MAX122BEAG application, or MAX122BEAG equivalent, this page delivers verified specifications, package mapping to 24-pin SSOP, functional pin roles, real-world use cases in spectrum analysis and telecom processing, and two validated alternative ADCs with documented technical distinctions.
Technical Context
The MAX122BEAG employs successive approximation architecture with an internal 350ns acquisition-time track/hold circuit and a precision -5.00V reference output buffered for external bypassing. Its conversion timing is strictly clock-synchronous, requiring 13–14 CLKIN cycles (2.6µs typical at 5MHz), and supports five distinct interface modes-including continuous-conversion mode when MODE, CONVST, RD, and CS are grounded.
Digital control uses TTL/CMOS-compatible inputs (VIH = 2.4V, VIL = 0.8V) and three-state outputs (D11–D0) with 75ns data-access time and 65ns bus-relinquish time. The device operates from +4.75V to +5.25V (VDD) and -10.8V to -15.75V (VSS), delivering 210mW typical power dissipation across its -40°C to +85°C industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit, guaranteed no missing codes over full temperature range |
| Throughput Rate | 333ksps maximum, enabled by 2.6µs conversion time at 5MHz clock |
| Analog Input Range | ±5V bipolar, overvoltage tolerant to ±15V-enables direct connection to industrial sensor outputs without external scaling |
| SINAD | 70dB minimum at 50kHz input-ensures usable dynamic range for audio and telecom signal digitization |
| THD | -77dB maximum (first five harmonics)-supports clean spectral analysis up to Nyquist frequency |
| Reference Output | -5.00V buried-zener, ±25ppm/°C drift-provides stable scaling for precision bipolar measurements |
| Power Supply | +4.75V to +5.25V (VDD), -10.8V to -15.75V (VSS)-requires dual-rail supply but eliminates need for external reference IC |
Pinout & Package
MAX122BEAG is housed in a RoHS-compliant 24-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, optimized for high-density PCB layouts while maintaining thermal performance up to 85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MODE) | Mode configuration input | Hardwired to DGND to enable continuous-conversion mode; open or VDD selects INT/BUSY behavior |
| 2 (VSS) | Negative power supply | Accepts -10.8V to -15.75V-must be decoupled with 0.1µF + 22µF capacitors to AGND for reference stability |
| 3 (VDD) | Positive power supply | +4.75V to +5.25V rail-bypassed separately to DGND to minimize digital noise coupling into analog section |
| 4 (AIN) | Analog input terminal | ±5V bipolar input with 6kΩ || 10pF impedance-directly interfaces with op-amp drivers without external RC filtering |
| 5 (VREF) | Internal reference output | -5.00V zener reference-requires mandatory 0.1µF ceramic + 22µF electrolytic bypass to AGND to suppress 30ps aperture jitter |
| 6 (AGND) | Analog ground reference | Separate ground plane node-must tie to DGND only at single-point star connection near power entry |
| 7–11, 13–19 (D11–D0) | Three-state data outputs | 12-bit twos-complement parallel bus-drives standard 12-bit microprocessor data lines without level shifters |
| 12 (DGND) | Digital ground reference | Isolated ground return for logic signals-prevents digital switching noise from modulating analog conversion accuracy |
| 20 (CONVST) | Convert start trigger | Falling-edge initiated-starts SAR conversion and places T/H into hold mode; must remain low during conversion |
| 21 (CLKIN) | Master clock input | 0.1MHz–5MHz TTL-compatible clock-determines exact conversion time (13 or 14 cycles); asynchronous to control inputs |
| 22 (INT/BUSY) | Status output | Configurable as interrupt (MODE=VDD) or busy flag (MODE=open/DGND)-indicates data validity for µP or FIFO synchronization |
| 23 (CS) | Chip-select input | Active-low enable-when low with RD, enables D11–D0 outputs; falling edge with CONVST/RD initiates conversion |
| 24 (RD) | Read strobe input | Active-low data latch-when CS is low, RD gates output drivers and may initiate conversion depending on mode |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold with 350ns acquisition | Eliminates external sample-hold IC and associated layout complexity while guaranteeing consistent settling before conversion |
| Bipolar ±5V input with ±15V overvoltage tolerance | Supports direct connection to industrial transducers and legacy instrumentation without front-end protection circuitry |
| Five programmable interface modes | Enables seamless integration with µPs lacking wait-state capability (ROM/Slow-Memory modes) or FIFO/DMA-based systems (Stand-Alone/Continuous modes) |
| On-chip -5V reference with ±25ppm/°C drift | Removes need for external precision reference IC, reducing BOM count and improving long-term gain stability in field-deployed equipment |
| TTL/CMOS-compatible I/O with 75ns access time | Interfaces directly with 8051, Z80, and ARM7 derivatives without glue logic or timing adapters |
Applications
| Audio Signal Digitization | Telecom Channel Monitoring |
|---|---|
Use Scenario: Capturing wideband voice and tone signals in VoIP gateways and PBX line cards operating at 333ksps sampling rate. IC Role / Device Role / Timing Role: Primary ADC converting conditioned analog line signals to 12-bit twos-complement digital streams for DSP processing. Use Value: 70dB SINAD and -77dB THD ensure carrier-grade audio fidelity without harmonic distortion artifacts in encoded bitstreams. | Use Scenario: Real-time monitoring of analog telecom channel parameters including echo return loss and noise floor in central office test equipment. IC Role / Device Role / Timing Role: High-speed acquisition front-end synchronized to system clock for FFT-based spectral analysis of baseband signals. Use Value: 333ksps throughput and 1.5MHz full-power bandwidth support accurate measurement of channel impairments up to 166kHz. |
| Spectrum Analyzer Front-End | Industrial Data Logging |
Use Scenario: Digitizing RF downconverted IF signals in portable handheld spectrum analyzers requiring compact, low-power ADC solutions. IC Role / Device Role / Timing Role: Bipolar input ADC capturing 50kHz–166kHz IF bands with precise amplitude scaling via internal -5V reference. Use Value: ±5V input range and ±15V overvoltage tolerance allow safe operation during antenna mismatch events without front-end clamping diodes. | Use Scenario: Recording vibration, temperature, and pressure waveforms from rotating machinery in predictive maintenance systems deployed in harsh factory environments. IC Role / Device Role / Timing Role: Isolated analog acquisition node converting sensor outputs to digital values for CAN or Ethernet transmission. Use Value: -40°C to +85°C operating range and robust power-supply rejection (±1/4 LSB PSRR) ensure reliable operation despite wide ambient swings and noisy plant power rails. |
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, 1.25MSPS, single-supply (+5V only), no internal reference | Requires external reference and level-shifting for bipolar inputs; better suited for high-throughput DC-coupled systems | Select when higher speed and single-rail operation outweigh need for integrated reference and bipolar input simplicity |
| AD7892BRZ | 12-bit, 600kSPS, ±10V input range, separate REF IN/OUT pins | Accepts wider input range but lacks on-chip reference-requires external precision reference for best INL | Choose when system already includes a high-stability external reference and demands extended input voltage headroom |
Compared with ADS7800U and AD7892BRZ, the MAX122BEAG uniquely integrates a -5V reference and ±5V bipolar input in a single 24-pin SSOP package, reducing component count and layout area for industrial data acquisition where supply rail constraints and board space are critical.
Availability
MAX122BEAG is available at Aetrix Electronics and suitable for spectrum analysis instruments, telecom channel monitors, audio digitization modules, and industrial data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX122BEAG 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, medical, and communications applications.
The MAX120/MAX122 product line was engineered specifically for high-fidelity, medium-speed data acquisition in dual-supply systems where integration of track/hold, reference, and µP interface reduces design complexity and improves system-level SNR.
FAQ
What is the maximum clock frequency supported by the MAX122BEAG?
The MAX122BEAG accepts a TTL-compatible clock input from 0.1MHz to 5MHz. At 5MHz, the device achieves its rated 333ksps throughput with a typical conversion time of 2.6µs (13 clock cycles). Operation above 5MHz is not guaranteed and may result in invalid conversions or increased DNL error beyond specification limits.
Does the MAX122BEAG require external components for basic operation?
Yes-the MAX122BEAG requires external decoupling capacitors: 0.1µF ceramic + 22µF electrolytic on VREF-to-AGND, plus 0.1µF on VDD-to-DGND and VSS-to-AGND. No external track/hold capacitor or reference IC is needed, as both functions are fully integrated within the MAX122BEAG die.
How does the MODE pin affect the INT/BUSY output behavior in the MAX122BEAG?
When MODE is tied to VDD, INT/BUSY functions as an interrupt output that goes low upon conversion completion and returns high after data read. When MODE is open or connected to DGND, INT/BUSY acts as a busy flag-going low at conversion start and returning high only after data is valid on D11–D0. This configuration is fixed per MAX122BEAG hardware setup.
Can the MAX122BEAG operate with a single positive supply?
No-the MAX122BEAG requires dual supplies: +4.75V to +5.25V on VDD and -10.8V to -15.75V on VSS. Its internal -5V reference and ±5V analog input stage depend on the negative rail; operation with only a positive supply will prevent proper reference biasing and cause catastrophic conversion failure.
What is the guaranteed integral nonlinearity (INL) specification for the MAX122BEAG?
The MAX122BEAG has a guaranteed INL of ±1 LSB over its full operating temperature range (-40°C to +85°C), as confirmed in the Electrical Characteristics table for MAX122BC/BE variants. This ensures monotonic transfer function and predictable code transitions across all 4096 output levels without calibration.
MAX122BEAG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SSOP (0.209", 5.30mm 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-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX122BEAG FAQ
1.How can I place an order for MAX122BEAG through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX122BEAG 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 MAX122BEAG reliable?
The price and inventory of MAX122BEAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX122BEAG is usually 5 days.
3.What payment methods are accepted for MAX122BEAG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX122BEAG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX122BEAG?
MAX122BEAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX122BEAG 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 MAX122BEAG?
For technical support, including MAX122BEAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX122BEAG requirements.
6.How does Aetrix verify that MAX122BEAG is sourced from the original manufacturer or authorized distributors?
All MAX122BEAG 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 MAX122BEAG meets industry standards.
7.What is the process for return or replacement of MAX122BEAG?
All MAX122BEAG units undergo pre-shipment inspection (PSI). If there is an issue with MAX122BEAG, 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 MAX122BEAG part is unused and in its original packaging.
Return procedure for MAX122BEAG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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