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Analog Devices Inc./Maxim Integrated MAX1121EGK+D
- Part No.:
- MAX1121EGK+D
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 68-VFQFN Exposed Pad
- Datasheet:
-
MAX1121EGK+D.pdf
- Description:
- IC ADC 8BIT 250MSPS 68QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,915
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Product details
Overview
MAX1121EGK+D from Maxim Integrated is an 8-bit, 250Msps analog-to-digital converter optimized for wideband IF sampling up to 500MHz, operating on a single 1.8V supply with 477mW power dissipation at full rate and delivering 48.9dB SNR at 10MHz input - ideal for digital predistortion receivers in cellular base-station transceivers.
For engineers reviewing the MAX1121EGK+D datasheet, MAX1121EGK+D pinout, MAX1121EGK+D application, or MAX1121EGK+D equivalent, this page provides verified technical context, LVDS output timing behavior, industrial-temperature package validation, and confirmed alternatives for high-speed ADC selection in broadband communication systems.
Technical Context
The MAX1121EGK+D implements a fully differential 8-bit pipelined architecture with integrated track-and-hold and internal 1.23V bandgap reference, supporting AC- or DC-coupled differential analog inputs (±0.3125V around 1.4V common-mode) and LVDS-compatible clock/data interfaces. Its on-chip clock management circuit enforces 40–60% duty cycle and enables divide-by-2 clock division via CLKDIV control.
Digital outputs include eight LVDS data pairs (D0P/N–D7P/N), differential clock outputs (DCLKP/N), and out-of-range flags (ORP/N), all powered from a separate 1.8V OVCC rail. The T/B pin selects between two's complement or offset binary output format, with internal pulldown resistors on CLKDIV and T/B for default low-state operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit quantization with no missing codes guaranteed across -40°C to +85°C. |
| Sampling Rate | 250Msps maximum; minimum 20Msps - supports flexible IF sampling in radar and comms test equipment. |
| SNR | 48.9dB at 10MHz input; remains ≥48.7dB up to 500MHz - flat dynamic performance enables wideband signal capture. |
| SFDR | 68dBc at 100MHz input; 63.8dBc at 500MHz - critical for suppressing spurs in dense spectral environments. |
| Power Supply | Single 1.8V AVCC and separate 1.8V OVCC - decoupling required per pin with 0.1µF capacitors for noise immunity. |
| Analog Input Range | 1.25VP-P differential full-scale (±0.3125V around 1.4V common-mode) - compatible with standard RF balun outputs. |
| Output Interface | LVDS-compatible D0P/N–D7P/N, DCLKP/N, ORP/N - requires 100Ω differential termination at receiver end. |
Pinout & Package
The MAX1121EGK+D is housed in a 68-pin QFN with exposed pad (EP), specified for industrial temperature range (-40°C to +85°C). The exposed pad must be soldered to AGND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INP / INN | Differential analog input pair | Accepts ±0.3125V swing around 1.4V common-mode; self-biased via 2.2kΩ resistors; AC-coupling recommended for best SFDR. |
| CLKP / CLKN | Differential LVDS clock input | Accepts 200–500mVP-P differential drive; internal bias at 1.25V ±0.25V; duty-cycle equalizer active above 20MHz. |
| D0P/N–D7P/N | LVDS parallel data outputs (LSB to MSB) | 8-bit word in selectable two's complement or offset binary; 0.4V differential swing around 1.2V common-mode; 100Ω termination required. |
| DCLKP / DCLKN | LVDS clock output | 2.1ns delay relative to CLKP/CLKN; used to latch external logic or synchronize FPGA capture; same voltage levels as data outputs. |
| ORP / ORN | Out-of-range flag outputs | Differential pair asserting high/low when input exceeds ±FS; enables real-time clipping detection without host processor overhead. |
| CLKDIV | LVCMOS clock divider control | Pulldown resistor onboard; logic low enables divide-by-2 mode (data updated at fCLK/2); simplifies jitter-sensitive clock tree design. |
| T/B | Output format select | Pulldown resistor onboard; logic low = two's complement; logic high = offset binary - configures data interpretation in downstream logic. |
| REFIO / REFADJ | Reference I/O and adjustment | REFIO outputs 1.23V internal reference; REFADJ adjusts full-scale range via external resistor network (e.g., 100kΩ trimmer). |
Key Features
| Feature | Design Value |
|---|---|
| On-chip track-and-hold | Enables stable sampling at 250Msps without external hold capacitor or driver complexity. |
| Selectable divide-by-2 clock path | Reduces effective clock jitter impact on aperture uncertainty by halving input clock frequency before sampling. |
| LVDS digital interface | Minimizes EMI and timing skew across PCB traces; supports point-to-point or fanout-to-FPGA with proper termination. |
| Internal 1.23V bandgap reference | Eliminates need for external precision reference; adjustable full-scale range via REFADJ resistor network. |
| Out-of-range detection outputs | ORP/ORN provide immediate hardware-level clipping indication - avoids software polling latency in real-time systems. |
Applications
| Cellular Base-Station Digital Predistortion | Digital Oscilloscope Front-End |
|---|---|
Use Scenario: Capturing wideband feedback signals from PA output to adaptively correct nonlinear distortion in LTE/5G transmitters. IC Role / Device Role / Timing Role: High-speed ADC digitizing 100–500MHz IF signals with minimal added noise or spurious content. Use Value: 68dBc SFDR at 100MHz ensures clean capture of adjacent channel interference for accurate predistortion modeling. |
Use Scenario: Sampling analog waveforms up to 250Msps in portable or benchtop oscilloscopes requiring >100MHz analog bandwidth. IC Role / Device Role / Timing Role: Primary digitizer in acquisition path, interfacing directly to front-end amplifier and FPGA memory controller. Use Value: 48.9dB SNR at 10MHz and flat response to 500MHz enable accurate amplitude and harmonic measurement across full bandwidth. |
| Radar Antenna Array Processing | Communications Test Equipment |
Use Scenario: Digitizing multiple phase-aligned IF channels in phased-array radar receivers for beamforming and Doppler processing. IC Role / Device Role / Timing Role: Synchronized ADC across channels using shared LVDS clock (DCLKP/N) and precise aperture jitter (0.2ps RMS). Use Value: Low aperture jitter preserves phase coherence between channels - essential for high-resolution angle estimation. |
Use Scenario: Signal analysis in vector signal analyzers and modulated signal testers requiring high dynamic range and fast sweep rates. IC Role / Device Role / Timing Role: Core ADC in RF downconversion chain, feeding FPGA-based FFT and demodulation blocks. Use Value: Two-tone IMD of -70dBc (99/101MHz) validates linearity for multi-carrier LTE signal analysis without distortion masking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1124EGK+ | Same 8-bit, 250Msps spec, but rated for extended temperature range (-40°C to +105°C); identical pinout and LVDS interface. | Better suited for convection-cooled outdoor base stations or avionics where junction temperature exceeds +85°C. | Select MAX1124EGK+ when ambient or power dissipation pushes junction temp beyond +85°C; otherwise MAX1121EGK+D is cost-optimized. |
| ADS5272IPFP | 8-bit, 250Msps, but uses CMOS outputs (not LVDS); higher power (650mW); no on-chip clock divider or out-of-range flag. | Requires external level-shifting and termination; lacks hardware clipping detection - increases FPGA logic burden. | Choose ADS5272IPFP only if existing board uses CMOS interface and layout cannot accommodate LVDS routing or termination. |
Compared with MAX1124EGK+, the MAX1121EGK+D trades extended temperature rating for lower cost and identical performance at industrial range; versus ADS5272IPFP, it delivers lower EMI, reduced FPGA resource usage via LVDS and ORP/N, and simpler clock tree integration via CLKDIV.
Availability
MAX1121EGK+D is available at Aetrix Electronics and suitable for cellular infrastructure, test instrumentation, and radar subsystems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MAX1121EGK+D 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-speed data conversion ICs for demanding communications, industrial, and automotive applications.
The MAX1121EGK+D belongs to Maxim's high-speed ADC product line, engineered specifically for wideband IF sampling in wireless infrastructure and instrumentation where dynamic performance, low power, and LVDS interoperability are critical.
FAQ
What is the maximum analog input frequency supported by the MAX1121EGK+D?
The MAX1121EGK+D maintains flat SNR performance up to 500MHz input frequency, with full-power analog bandwidth specified at 600MHz. At 500MHz, it achieves 48.7dB SNR and 63.8dBc SFDR - making it suitable for direct IF sampling in modern wideband radio systems. This capability is enabled by its fully differential pipeline architecture and optimized input buffer design.
Does the MAX1121EGK+D require external reference components?
No - the MAX1121EGK+D integrates a 1.23V bandgap reference and reference-scaling amplifier. REFIO provides the buffered reference output, and REFADJ allows full-scale adjustment via external resistor networks. A 0.1µF capacitor on REFIO to AGND is mandatory; no external reference IC or precision resistor is needed for basic operation.
Can the MAX1121EGK+D operate with a single-ended clock input?
Although the MAX1121EGK+D is optimized for differential LVDS clock drive (CLKP/CLKN), it can accept a single-ended clock applied to CLKP with CLKN AC-coupled to 1.25V. However, this degrades SFDR by ~3–5dB and increases sensitivity to power supply noise - differential drive is strongly recommended for production systems.
What is the purpose of the ORP and ORN pins on the MAX1121EGK+D?
The ORP (true) and ORN (complementary) pins on the MAX1121EGK+D form a differential out-of-range flag that asserts when the analog input exceeds positive or negative full scale (±0.3125V around 1.4V). This hardware-level indicator eliminates software polling latency and enables immediate gain adjustment or alarm triggering in real-time signal processing chains.
How does the CLKDIV pin affect timing in the MAX1121EGK+D?
The CLKDIV pin on the MAX1121EGK+D controls whether digital outputs update at the full input clock rate (CLKDIV = high) or at half-rate (CLKDIV = low). In divide-by-2 mode, the internal clock divider reduces effective aperture jitter impact and eases clock distribution requirements - particularly valuable in systems with marginal clock source phase noise.
MAX1121EGK+D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 68-VFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 250M
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- LVDS - Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Pipelined
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 1.7V ~ 1.9V
- Voltage - Supply, Digital:
- 1.7V ~ 1.9V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 68-QFN (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1121EGK+D FAQ
1.How can I place an order for MAX1121EGK+D through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1121EGK+D 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 MAX1121EGK+D reliable?
The price and inventory of MAX1121EGK+D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1121EGK+D is usually 5 days.
3.What payment methods are accepted for MAX1121EGK+D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1121EGK+D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1121EGK+D?
MAX1121EGK+D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1121EGK+D 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 MAX1121EGK+D?
For technical support, including MAX1121EGK+D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1121EGK+D requirements.
6.How does Aetrix verify that MAX1121EGK+D is sourced from the original manufacturer or authorized distributors?
All MAX1121EGK+D 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 MAX1121EGK+D meets industry standards.
7.What is the process for return or replacement of MAX1121EGK+D?
All MAX1121EGK+D units undergo pre-shipment inspection (PSI). If there is an issue with MAX1121EGK+D, 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 MAX1121EGK+D part is unused and in its original packaging.
Return procedure for MAX1121EGK+D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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