MAX1421CCM+D - 12-Bit 40Msps 3.3V ADC | Maxim Integrated
MPN: MAX1421CCM+D ✓ פעילMAX1421CCM+D סקירה
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that samples continuous analog waveforms and produces discrete digital codes; within the converter family, the MAX1421CCM+D is a pipelined successive-approximation hybrid (pipelined SAR) with wideband T/H, sitting hierarchically under data converter -> ADC -> high-speed pipelined ADC -> mixed-signal IC -> semiconductor. Pipelined ADCs deliver tens-of-MHz sample rates with multi-channel per-stage gain and quantization, trading slightly higher latency for throughput efficiency - the foundation behind ultrasound, communications baseband, and CCD imaging front ends.
Key features include 12-bit resolution at 40Msps minimum sampling rate, 3.3V single-supply operation, internal precision 2.048V reference, fully-differential analog input for high common-mode rejection, wideband T/H supporting IF undersampling, and parallel offset-binary digital outputs. Per the datasheet, the part typically dissipates approximately 130 mW at 40Msps from a single 3.3V rail. Pin-compatible higher- and lower-speed drop-in variants are also offered in the same 48-pin LQFP package, simplifying board-level speed migration.
Typical applications include high-speed data acquisition, CCD pixel processing, baseband sampling in wireless transceivers, medical ultrasound imaging front ends, and IF digitization in cable-modem / set-top-box receivers. The internal reference and single 3.3V supply simplify bill-of-materials versus discrete-ADC designs that require external references and negative rails.
When laying out the PCB, keep analog input traces short and symmetric, decouple AVDD/DVDD with 0.1 uF plus 10 uF ceramic capacitors as close to the pins as possible, and isolate the digital output bus from the analog input region with a continuous ground plane. The internal reference is stable but should still be bypassed per datasheet recommendations to minimize kickback noise into the sample-and-hold.
This page consolidates distributor pricing, parametric comparison against same-family MAX1421 variants and competitor ADCs, and PCB design notes beyond what is repeated on DigiKey/Mouser product listings.
חלופות תחליף ישיר עבור MAX1421CCM+D — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם MAX1421CCM+D (אותו גורם צורה וטביעת רגל) — שונים ב Operating Temperature, Architecture, Package, Resolution, Number of Channels.
MAX1421CCM+TD
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
MAX1421ECM+D
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
MAX1420CCM+D
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←MAX1420CCM+TD
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←MAX1420ECM+T
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←MAX1421CCM+D דירוגים מרביים ומאפיינים חשמליים
| רזולוציה | 12 bits |
| Sampling Rate (Max) | 40 Msps |
| Number of Channels | 1 |
| Input Type | Differential, Single-Ended |
| Architecture | Pipelined, 12-stage |
| Data Interface | Parallel (offset-binary, CMOS, three-state) |
| Supply Voltage (Analog/Digital) | 3.3 V |
| Internal Reference | Yes (2.048 V) |
| טמפרטורת פעולה | 0C to +70C (commercial) |
| מארז / Case | 48-LQFP (LFQFP), 7 mm x 7 mm |
| Number of Terminals | 48 |
| Terminal Form | Gull Wing |
| Package Code | LFQFP |
| סוג הרכבה | Surface Mount |
| Track-and-Hold (T/H) | Wideband, on-chip |
תצורת פינים של MAX1421CCM+D
| פין 1 | AVDD — Analog supply voltage (3.3V) - datasheet pin configuration may vary; refer to MAX1421 datasheet for exact mapping |
| פין 2 | AVDD — Analog supply voltage (3.3V) |
| פין 3 | GND — Analog ground |
| פין 4 | IN+ — Positive differential analog input |
| פין 5 | IN- — Negative differential analog input |
| פין 6 | GND — Analog ground reference for input |
| פין 7 | REF_OUT — Internal reference output (2.048V) |
| פין 8 | REF_COM — Reference common / ground |
| פין 9 | REFBP — Reference bypass - decouple to GND |
| פין 10 | REFRTN — Reference return |
| פין 11 | GND — Ground |
| פין 12 | AVDD — Analog supply |
| פין 13 | DVDD — Digital supply (3.3V) |
| פין 14 | GND — Digital ground |
| פין 15 | CLK — Clock input - conversion initiated on rising edge |
| פין 16 | CLK — Complementary clock input (if used) |
| פין 17 | D11 — Data output bit 11 (MSB) |
| פין 18 | D10 — Data output bit 10 |
| פין 19 | D9 — Data output bit 9 |
| פין 20 | D8 — Data output bit 8 |
| פין 21 | GND — Digital ground |
| פין 22 | D7 — Data output bit 7 |
| פין 23 | D6 — Data output bit 6 |
| פין 24 | D5 — Data output bit 5 |
| פין 25 | D4 — Data output bit 4 |
| פין 26 | DVDD — Digital supply |
| פין 27 | D3 — Data output bit 3 |
| פין 28 | D2 — Data output bit 2 |
| פין 29 | D1 — Data output bit 1 |
| פין 30 | D0 — Data output bit 0 (LSB) |
| פין 31 | GND — Digital ground |
| פין 32 | OE — Output enable (three-state control, active low) |
| פין 33 | PD — Power-down input |
| פין 34 | GND — Ground |
| פין 35 | AVDD — Analog supply |
| פין 36 | AVDD — Analog supply |
| פין 37 | GND — Analog ground |
| פין 38 | NC — Not connected (per datasheet) |
| פין 39 | NC — Not connected (per datasheet) |
| פין 40 | AVDD — Analog supply |
| פין 41 | GND — Analog ground |
| פין 42 | NC — Not connected (per datasheet) |
| פין 43 | NC — Not connected (per datasheet) |
| פין 44 | AVDD — Analog supply |
| פין 45 | GND — Ground |
| פין 46 | AVDD — Analog supply |
| פין 47 | GND — Ground |
| פין 48 | DVDD — Digital supply |
יישומים טיפוסיים
MAX1421CCM+D מתאים עבור 6 יישוםs: High-Speed Data Acquisition Systems, CCD Imaging and Digital Photography Front Ends, Wireless Communications IF Sampling, Medical Ultrasound Imaging Front Ends, Cable Modem / Set-Top Box IF Digitization, Industrial Test and Measurement Instrumentation.
High-Speed Data Acquisition Systems
The MAX1421CCM+D fits high-speed data acquisition front ends where 12-bit resolution and 40Msps are required to capture transient analog waveforms without aliasing. Its fully-differential input rejects common-mode interference on long sensor cables, and the parallel CMOS outputs feed directly into an FPGA FIFO, eliminating serializer latency. Compared with the 10Msps MAX1420, the MAX1421 provides 4x oversampling headroom for anti-aliasing filter relaxation. Typical power dissipation is approximately 130 mW at full sample rate from a single 3.3 V rail, simplifying thermal management in compact DAQ boards.
מומלץ
CCD Imaging and Digital Photography Front Ends
The MAX1421CCM+D is well matched to CCD pixel processing where correlated double sampling requires a wideband track-and-hold and 12-bit dynamic range at pixel-clock rates up to 40 MHz. The internal 2.048 V reference eliminates the need for an external reference IC, reducing BOM cost. The differential input handles the CCD's common-mode output levels directly. Per the Maxim datasheet, the part's wideband T/H preserves pixel-to-pixel transient integrity, and the parallel CMOS outputs can drive an image processor bus at full speed without an external buffer.
מומלץ
Wireless Communications IF Sampling
In IF-sampling radio architectures, the MAX1421CCM+D digitizes intermediate-frequency signals directly at 40 Msps, replacing analog quadrature demodulation. The wideband track-and-hold supports IF frequencies up to ~70 MHz, enabling undersampling of higher-frequency IFs. The fully-differential input rejects switching noise from the digital baseband. Per the Maxim datasheet, the parallel offset-binary CMOS outputs are FPGA-compatible, allowing direct interfacing with baseband DSP engines without glue logic. Single 3.3 V supply simplifies power design in multi-radio platforms.
מומלץ
Medical Ultrasound Imaging Front Ends
The MAX1421CCM+D's combination of 12-bit resolution, 40 Msps sample rate, and fully-differential input makes it a strong fit for ultrasound beamforming front ends where transducer channels must be digitized at high speed with excellent common-mode rejection. The parallel CMOS outputs stream data directly into an FPGA beamformer at full pixel rate. The single 3.3 V supply supports portable cart-based ultrasound systems where power budget is tight. Per the Maxim datasheet, the part dissipates around 130 mW typical, allowing high channel density on a single board.
מומלץ
Cable Modem / Set-Top Box IF Digitization
Cable modem and set-top-box tuners benefit from the MAX1421CCM+D's ability to digitize IF signals directly at 40 Msps from a 3.3 V supply. The internal 2.048 V reference eliminates an external reference, and the parallel outputs drive a downstream QAM demodulator DSP. The wideband track-and-hold enables direct IF sampling at standard cable IF frequencies (e.g., 36-44 MHz), removing analog downconversion stages. The MAX1421 family offers pin-compatible higher- and lower-speed variants for product-line flexibility, all in the same 48-pin LQFP footprint.
מומלץ
Industrial Test and Measurement Instrumentation
In oscilloscopes, spectrum analyzers, and bench-top digitizers, the MAX1421CCM+D provides a 12-bit, 40 Msps digitizer channel with a wideband track-and-hold and differential input for high CMRR. The parallel CMOS outputs are easily captured by an FPGA acquisition memory. Per the Maxim datasheet, the part's commercial 0C to +70C temperature range suits laboratory environments; for industrial deployments, the MAX1421EUI+ offers the same footprint with -40C to +85C operation. The internal reference simplifies calibration procedures versus external-reference designs.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור MAX1421CCM+D — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | MAX1421CCM+TD | MAX1421ECM+D | MAX1420CCM+D | MAX1420CCM+TD | MAX1420ECM+T |
|---|---|---|---|---|---|---|
| Package | 48-LQFP (LFQFP) | 48-LQFP (LFQFP) - same | 48-LQFP (TQFP-48) - same footprint | 48-LQFP (LFQFP) - same | 48-LQFP (LFQFP) - same | 48-LQFP (LFQFP) - same |
| Brand | Maxim Integrated (Analog Devices) | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 40 Msps | 40 Msps | 40 Msps | 10 Msps | 10 Msps | 10 Msps |
| Input Type | Differential, Single-Ended | Differential, Single-Ended | Differential | Differential, Single-Ended | Differential, Single-Ended | Differential, Single-Ended |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Operating Temperature | 0C to +70C (commercial) | 0C to +70C (commercial) | -40C to +85C (extended industrial) | 0C to +70C (commercial) | 0C to +70C (commercial) | -40C to +85C (industrial) |
| Internal Reference | Yes (2.048 V) | Yes (2.048 V) | Yes (2.048 V) | Yes (2.048 V) | Yes (2.048 V) | Yes (2.048 V) |
מבדילים עיקריים
- 40 Msps throughput versus lower-speed MAX1420 family siblings (לעומתMAX1420CCM+D)
- Differential and single-ended input compatibility (לעומתMAX1421ECM+D)
- Single 3.3 V supply with internal precision reference (לעומתAD9220 (Analog Devices competitor))
הערות תכנון
Place 0.1 uF ceramic decoupling capacitors as close as possible to every AVDD and DVDD pin, with a single 10 uF bulk tantalum or ceramic capacitor per supply rail. Per the Maxim datasheet, the analog and digital grounds should join at a single star point near the ADC's GND pins to avoid digital return currents flowing through the analog ground plane. Keep the parallel digital output traces short and route them on the opposite side of the ground plane from the analog input traces to minimize digital coupling into the sensitive front end.
The MAX1421CCM+D operates from a single 3.3 V supply for both AVDD and DVDD. Estimated: total current consumption is approximately 40 mA at 40 Msps (130 mW dissipation), so each supply pin must be sized to source at least 10 mA. A ferrite bead or small LC filter between the analog 3.3 V rail and the digital 3.3 V rail is a common practice to isolate the noisy digital supply from the sensitive analog front end. Verify with the manufacturer's reference design before finalizing the power tree.
Do not omit the REFBP bypass capacitor - the internal 2.048 V reference requires a 0.1 uF ceramic cap close to the REFBP pin to maintain low output noise; without it, SNR and SFDR degrade noticeably. Also, ensure the differential input common-mode voltage is biased within the input common-mode range; use the REF_OUT pin through a resistor divider to set IN- bias if the source is DC-coupled. The OE (output enable) pin must be tied low for normal operation, or the digital outputs remain in three-state.
מידע על תאימות
RoHS/REACH/lead-free status not explicitly stated in the verified web data; check the manufacturer datasheet's ordering information table for the lead-free / RoHS-compatible part suffix. AEC-Q100 not applicable (commercial/industrial grade ADC, not automotive qualified).
