ADC12451CIJ - 12-Bit+Sign SAR ADC w/ S/H, 83ksps | Texas Instruments
MPN: ADC12451CIJ ✗ סוף ייצורADC12451CIJ סקירה
Key features include a self-calibration cycle that corrects linearity, zero-scale, and full-scale errors on demand, an Auto-Zero mode that minimizes drift, differential nonlinearity typically better than 0.5 LSB, and a track-and-hold with a 1.5 MHz input bandwidth. The parallel output interface simplifies connection to legacy microprocessors, DSPs, and FPGA data acquisition blocks, while the through-hole ceramic DIP package suits instrumentation, military, and aerospace retrofits where hermetic packaging is required.
The ADC12451 uses a charge-redistribution SAR architecture with a calibrated switched-capacitor DAC, a high-gain comparator, and an on-chip clock, eliminating the need for external timing components. Self-calibration is performed via a simple digital command sequence, after which the part stores correction coefficients in internal latches; this allows the converter to maintain specified linearity across the full operating temperature range without periodic user recalibration.
Typical applications include industrial process control data acquisition boards, precision instrumentation front-ends, medical diagnostic equipment, military/aerospace signal-conditioning modules, and legacy replacement of older 12-bit ADCs in existing through-hole designs. The combination of self-calibration, parallel interface, and hermetic CDIP-24 package makes it especially attractive for new designs where long-term stability and reduced board-level recalibration are critical.
When designing with this device, ensure the analog and digital supplies are well decoupled and that the input signal source can drive the switched-capacitor sample-and-hold within the acquisition window. Calibrate the part after power-up and after any significant temperature excursion to maintain published linearity performance. For new designs that can accept SMD packages, modern pin-compatible SAR ADC alternatives with similar 12-bit+sign performance may offer smaller footprint and lower cost.
חלופות תחליף ישיר עבור ADC12451CIJ — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
ADC12451CIN
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
ADC12451CIJ/NOPB
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
ADC12451CIJ דירוגים מרביים ומאפיינים חשמליים
| רזולוציה | 12 bits + sign |
| Architecture | SAR (Successive Approximation) |
| קצב דגימה | 83 ksps |
| Number of Channels | 1 |
| Input Type | Single-ended (with pseudo-differential option) |
| Data Interface | Parallel |
| On-Chip Sample-and-Hold | Yes |
| Self-Calibration | Yes (line/zero/FS auto-cal) |
| Auto-Zero Mode | Yes |
| מארז / Case | 24-CDIP (0.600 in / 15.24 mm) Cerdip |
| מספר פינים | 24 |
| Packaging | Tube |
| טמפרטורת פעולה | -40C to +85C |
| מתח אספקה | +5 V analog (typ) |
| Input Bandwidth | 1.5 MHz (typ, sample-and-hold) |
| Differential Nonlinearity | 0.5 LSB (typ) |
| סוג הרכבה | Through-Hole |
תצורת פינים של ADC12451CIJ
| פין 1 | VREF — Reference voltage input |
| פין 2 | AIN+ — Analog input (non-inverting) |
| פין 3 | AIN- — Analog input (inverting) |
| פין 4 | AGND — Analog ground |
| פין 5 | S/H — Sample-and-hold control |
| פין 6 | CAL — Self-calibration trigger |
| פין 7 | AZ — Auto-Zero control |
| פין 8 | CS — Chip select (active low) |
| פין 9 | RD — Read strobe (active low) |
| פין 10 | CONVST — Conversion start |
| פין 11 | BUSY — Conversion in progress (active high) |
| פין 12 | DGND — Digital ground |
| פין 13 | DVDD — Digital supply (+5V) |
| פין 14 | DB11 — Data output bit 11 (MSB) |
| פין 15 | DB10 — Data output bit 10 |
| פין 16 | DB9 — Data output bit 9 |
| פין 17 | DB8 — Data output bit 8 |
| פין 18 | DB7 — Data output bit 7 |
| פין 19 | DB6 — Data output bit 6 |
| פין 20 | DB5 — Data output bit 5 |
| פין 21 | DB4 — Data output bit 4 |
| פין 22 | DB3 — Data output bit 3 |
| פין 23 | DB2 — Data output bit 2 |
| פין 24 | DB1 — Data output bit 1 (LSB) |
יישומים טיפוסיים
ADC12451CIJ מתאים עבור 6 יישוםs: Industrial Process Control Data Acquisition, Precision Instrumentation Front-End, Medical Diagnostic Equipment Signal Conditioning, Military and Aerospace Signal Acquisition, Legacy Through-Hole Retrofit Replacement, Audio Bandwidth Signal Digitization.
Industrial Process Control Data Acquisition
The ADC12451CIJ fits industrial process control data-acquisition front-ends where 12-bit+sign resolution, self-calibration, and a 24-CDIP through-hole package are required. The self-calibration cycle corrects linearity, zero-scale, and full-scale errors on demand, which is critical in long-lifecycle factory installations where periodic recalibration is impractical. At 83 ksps sampling rate and 1.5 MHz input bandwidth, the part can digitize multiplexed 4-20 mA loop signals, RTD/thermocouple conditioned outputs, and pressure/flow transducer signals. The parallel digital interface simplifies connection to legacy PLC backplanes and embedded industrial controllers without requiring an SPI controller. The -40C to +85C industrial temperature range and hermetic ceramic DIP package suit outdoor panel-mount installations and high-vibration factory environments.
מומלץ
Precision Instrumentation Front-End
The ADC12451CIJ suits precision laboratory instrumentation front-ends that demand dynamically-tested SNR and THD specifications. Unlike many SAR ADCs, the ADC12451's dynamic performance is tested and guaranteed at production, eliminating the need for incoming-test verification on critical signal paths. The 12-bit+sign resolution provides 13 effective bits of dynamic range, suitable for digitizing strain-gauge bridges, load-cell conditioned outputs, and analytical instrument sensors. Self-calibration maintains linearity over the -40C to +85C operating range, and Auto-Zero mode minimizes drift in long-duration measurements. The parallel output interface simplifies interfacing to FPGA-based digital signal processing blocks and DSP-based instrument controllers in bench-top and rack-mount laboratory equipment.
מומלץ
Medical Diagnostic Equipment Signal Conditioning
The ADC12451CIJ fits medical diagnostic equipment signal-conditioning modules where 12-bit+sign resolution, low drift, and a hermetic package are required. Self-calibration ensures that linearity and zero-scale accuracy are maintained across the device's lifetime, which is critical for diagnostic equipment subject to FDA/IEC 60601 quality system regulations. The 83 ksps sampling rate is sufficient for ECG, pulse oximetry, blood-pressure monitor, and patient monitor front-ends where the bandwidth of interest is below 10 kHz. The 24-CDIP ceramic package provides hermeticity, which is valuable in sterilizable medical equipment and implantable device external monitoring stations. The parallel interface simplifies connection to medical-grade microcontrollers and DSP processors without requiring additional serial-interface glue logic.
מומלץ
Military and Aerospace Signal Acquisition
The ADC12451CIJ suits military and aerospace signal-acquisition modules where hermetic ceramic packaging, wide industrial temperature range, and proven dynamic performance are mandatory. The 24-CDIP Cerdip package provides hermeticity required for MIL-STD-883 screening flows, and the part's self-calibration capability reduces field-maintenance overhead in deployed avionics and naval systems. At 83 ksps, the converter handles inertial sensor outputs, gyroscope/accelerometer conditioned signals, and discrete analog telemetry channels. The parallel digital interface enables direct connection to MIL-spec FPGAs and radiation-hardened processors without requiring SPI controllers. While not formally MIL-PRF-38535 qualified, the CDIP-24 package and industrial -40C to +85C operation meet many COTS-plus military retrofit requirements.
מומלץ
Legacy Through-Hole Retrofit Replacement
The ADC12451CIJ is the natural replacement for older 12-bit ADCs in legacy through-hole designs where PCB rework is impractical. The 24-CDIP package fits standard 24-pin DIP sockets, allowing drop-in upgrade of older boards that originally used ceramic or plastic DIP-packaged ADCs from the 1980s-1990s era. Self-calibration provides a modern performance boost over older non-calibrated parts, while the parallel interface preserves compatibility with legacy microprocessor and DSP glue logic. The 12-bit+sign resolution matches or exceeds the dynamic range of legacy 12-bit ADCs while adding sign-bit capability for bipolar signals. This retrofit use case is common in industrial control system upgrades, scientific instrument refurbishment, and military vehicle electronics modernization programs.
מומלץ
Audio Bandwidth Signal Digitization
The ADC12451CIJ fits audio-bandwidth signal digitization applications where 12-bit+sign resolution and 83 ksps sampling rate are sufficient for 20 kHz audio band signals. The on-chip sample-and-hold with 1.5 MHz input bandwidth cleanly captures audio-band signals without aliasing from out-of-band content, and the dynamically-tested SNR/THD specifications simplify audio quality verification. Self-calibration minimizes DC offset drift in long-duration audio recording equipment such as broadcast studio recorders, security audio monitoring stations, and conference recording systems. The parallel output interface enables direct connection to audio DSP processors and FPGA-based audio processing pipelines. For higher-fidelity audio work where 16-bit+ resolution is required, modern delta-sigma audio codecs are typically chosen instead.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ADC12451CIJ — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | ADC12451CIN |
|---|---|---|
| Brand | Texas Instruments | Texas Instruments |
| Package | 24-CDIP (Cerdip) | 24-CDIP (Cerdip) - same |
| Resolution | 12 bits + sign | 12 bits + sign |
| Sampling Rate | 83 ksps | 83 ksps |
| Architecture | SAR with self-calibration | SAR with self-calibration |
| Data Interface | Parallel | Parallel |
| Operating Temperature | -40C to +85C | -40C to +85C |
| Lifecycle Status | NRND | NRND |
מבדילים עיקריים
- Dynamically-tested SNR and THD at production (לעומתMost SAR ADCs in this class)
- On-chip user-triggered self-calibration (לעומתLegacy non-calibrated 12-bit ADCs)
- Hermetic 24-CDIP ceramic DIP package (לעומתModern SMD-only 12-bit SAR ADCs)
הערות תכנון
The ADC12451CIJ requires clean +5V analog and digital supplies with proper decoupling. Place a 10uF tantalum and 0.1uF ceramic decoupling capacitor pair close to the AVDD pin, and a separate 0.1uF ceramic close to the DVDD pin to isolate analog and digital supply noise. Use a star-ground topology with the analog ground pin returning directly to the power supply ground, avoiding shared ground paths with high-current digital logic. A linear low-dropout regulator (such as a TL431ACDBZR-based reference) feeding the analog supply provides the low-noise rail required for 12-bit performance.
Keep analog input traces short and guarded with analog ground to minimize pickup. Route the parallel digital output bus away from the analog input pin and reference voltage trace to prevent digital coupling into the analog front-end. Place the external reference decoupling capacitor (typically 10uF tantalum in parallel with 0.1uF ceramic) within 5 mm of the VREF pin. Keep the conversion start (CONVST) and chip select (CS) traces short to avoid timing skew, since the parallel interface timing budget at 83 ksps is approximately 12 us per conversion.
Always perform a self-calibration cycle after power-up and after any significant temperature excursion (greater than 10C change) to maintain published linearity performance. Do not operate the analog input beyond the supply rails, as the input ESD structures will forward-bias and corrupt the conversion. Ensure the input source can drive the switched-capacitor sample-and-hold within the acquisition window - typically a source impedance below 1 kohm is required at 83 ksps. When migrating to a SMD package, do not assume pin compatibility - the ADC12451 parallel-interface pinout is unique to this family and most SMD 12-bit SAR ADCs require a complete PCB redesign.
מידע על תאימות
RoHS, REACH, lead-free, and halogen-free status not stated in the verified web data - see NOPB suffix variant for lead-free option. Not AEC-Q100 qualified (industrial grade only).
