LTC1418CN#PBF - 14-bit 200ksps Low Power SAR ADC | Analog Devices
N.º da peça: LTC1418CN#PBF ⚠ Última compra| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $11.2 | $11,20 |
| 10 | $10.08 | $100,80 |
| 100 | $8.96 | $896,00 |
| 500 | $7.84 | $3.920,00 |
| 1.000 | $7 | $7.000,00 |
LTC1418CN#PBF Visão geral
What is a SAR ADC? A successive-approximation analog-to-digital converter is a type of ADC that performs a binary search across an internal DAC to converge on the input voltage one bit per cycle. Within the broader hierarchy, this places SAR ADCs alongside pipelined, sigma-delta, and flash converters inside the data acquisition IC family. SAR converters deliver an excellent balance of speed, accuracy, and low power, which is why they remain a workhorse for industrial process control, instrumentation, and multiplexed data-acquisition front ends.
Key features of the LTC1418CN#PBF include a built-in track-and-hold amplifier that eliminates the need for an external SHA, a typical differential non-linearity (DNL) of ±0.5 LSB, and bipolar/unipolar input capability when operated from ±5 V. Power-down mode reduces dissipation for battery-powered applications, and the wide analog input range (0 V to 5 V single-ended, ±5 V true bipolar) gives designers flexibility when digitizing transducer or sensor signals.
Architecturally, the LTC1418 uses a charge-redistribution DAC array combined with a precision buried-Zener reference and auto-calibrated switch-capacitor front end. At 200 ksps, it sustains full 14-bit performance without missing codes, and the serial/parallel interface allows the same silicon to drop into either high-pin-count microcontroller buses or low-pin-count SPI controllers.
Typical applications include industrial process-control data acquisition boards, portable or battery-powered instrumentation, multiplexed sensor read-back, and digital signal processing front ends. The 5 V single-supply capability also makes it suitable for legacy 5 V-only embedded designs.
Designers should note that the LTC1418 is in the process of being discontinued; an SSOP-28 replacement (LTC1418CG#PBF) exists but is NOT pin-to-pin compatible with the DIP-28. Plan PCB rework or substitute silicon if the DIP-28 supply runs out.
This page synthesizes Analog Devices datasheet data, distributor stock and pricing from DigiKey, and practical design considerations not found on manufacturer product pages.
Alternativas drop-in para LTC1418CN#PBF — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
LTC1418IN#PBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC1418CN#PBF Classificações máximas e características elétricas
| Resolução | 14 bits |
| Architecture | SAR (Successive Approximation) |
| Number of Inputs | 1 |
| Taxa de amostragem | 200 ksps |
| Input Configuration | Differential, Single-Ended |
| Output Interface | Parallel (14-bit) or Serial, selectable |
| Tensão de alimentação | Single 5 V or ±5 V |
| Power Dissipation | 15 mW typical |
| Encapsulamento | 28-PDIP (DIP-28, 0.300 inch / 7.62 mm) |
| Tipo de montagem | Through-Hole |
| Terminal Form | Through-Hole |
| Temperature Grade | Commercial |
| On-Board Reference | Yes (precision internal reference) |
| On-Board Sample-and-Hold | Yes |
| Status RoHS | Compliant |
Configuração de pinos do LTC1418CN#PBF
| Pino 1 | AGND — Analog ground |
| Pino 2 | VREF — Reference voltage (2.5 V internal) |
| Pino 3 | VINA — Analog input A |
| Pino 4 | VINB — Analog input B (differential) |
| Pino 5 | VREF BYP — Reference bypass |
| Pino 6 | AVDD — Analog 5 V supply |
| Pino 7 | VLOGIC — Logic interface supply |
| Pino 8 | DGND — Digital ground |
| Pino 9 | D13 — Parallel data bit 13 (MSB) |
| Pino 10 | D12 — Parallel data bit 12 |
| Pino 11 | D11 — Parallel data bit 11 |
| Pino 12 | D10 — Parallel data bit 10 |
| Pino 13 | D9 — Parallel data bit 9 |
| Pino 14 | D8 — Parallel data bit 8 |
| Pino 15 | D7 — Parallel data bit 7 |
| Pino 16 | D6 — Parallel data bit 6 |
| Pino 17 | D5 — Parallel data bit 5 |
| Pino 18 | D4 — Parallel data bit 4 |
| Pino 19 | D3 — Parallel data bit 3 |
| Pino 20 | D2 — Parallel data bit 2 |
| Pino 21 | D1 — Parallel data bit 1 |
| Pino 22 | D0 — Parallel data bit 0 (LSB) |
| Pino 23 | SCLK — Serial mode clock output |
| Pino 24 | SMODE — Serial/parallel mode select |
| Pino 25 | RD — Read input (parallel mode) |
| Pino 26 | CONVST — Conversion start input |
| Pino 27 | BUSY — Conversion busy output |
| Pino 28 | PWRDN — Power down input (active low) |
Aplicações típicas
LTC1418CN#PBF é adequado para 7 aplicaçãos: Industrial Process Control Data Acquisition, Portable Battery-Powered Instrumentation, Multiplexed Sensor Read-Back, DSP Front-End Conversion, Automated Test Equipment (ATE) Measurement Channels, Medical Patient Monitoring Equipment, Legacy Embedded Control Systems.
Industrial Process Control Data Acquisition
The LTC1418CN#PBF fits industrial process control boards where 14-bit resolution at 200 ksps is more than enough for closed-loop control of temperature, pressure, and flow loops. Its 0.5 LSB typical DNL and internal sample-and-hold hold code integrity at full throughput, so a single multiplexer can scan 4-8 transducer channels with sub-LSB repeatability. The single 5 V supply matches standard PLC backplane rails, and the parallel 14-bit output drops directly into an ISA or 5 V-tolerant MCU bus. Compared with sigma-delta ADCs of similar noise performance, the SAR core settles in a single conversion cycle, eliminating latency that would otherwise complicate PID feedback.
Recomendado
Portable Battery-Powered Instrumentation
Battery-powered instruments such as handheld multimeters, data loggers, and field meters benefit from the LTC1418CN#PBF's 15 mW dissipation at full 200 ksps throughput. Per the Analog Devices 1418fa datasheet, the part's true single 5 V operation lets you run it directly from a 4-cell AA battery pack or a USB-derived 5 V rail without regulators. The internal precision reference and sample-and-hold remove the need for external analog housekeeping, shrinking the entire signal chain onto a small two-layer board. Power-down modes drop consumption to microwatts between conversions, further extending run time on field-deployable test gear.
Recomendado
Multiplexed Sensor Read-Back
The LTC1418CN#PBF suits multiplexed sensor arrays (load cells, thermocouples, strain gauges) where one fast ADC digitizes many channels sequentially. The 1-channel differential input pairs with a downstream analog MUX like the ADG707 to scan 16 inputs without breaking the 200 ksps budget. The DIP-28 form factor stays compatible with through-hole industrial motherboards, and the bipolar ±5 V option accepts both 0-5 V single-ended signals and ±5 V transducer outputs without front-end scaling. Designers can perform hardware averaging in software to extract 16-bit equivalent noise performance across multiple samples.
Recomendado
DSP Front-End Conversion
Audio and vibration processing front ends use the LTC1418CN#PBF as the analog input stage feeding a DSP like the TMS320 family. The 200 ksps rate covers the entire audio band (Nyquist above 100 kHz) plus ultrasonic harmonics for vibration analysis, while 14 bits deliver 84 dB dynamic range matching most consumer audio requirements. The selectable serial interface streams data directly into a DSP serial port, eliminating glue logic. Compared with audio codecs, the SAR architecture gives true one-cycle latency which simplifies real-time DSP feedback loops such as active noise control or speaker protection algorithms.
Recomendado
Automated Test Equipment (ATE) Measurement Channels
ATE platforms such as rack-and-stack testers use the LTC1418CN#PBF as the per-pin measurement digitizer, where 200 ksps and 14 bits allow accurate measurement of power-supply rails, reference voltages, and analog node voltages across hundreds of test points under scanner multiplexing. The on-board reference and sample-and-hold remove rack-level calibration drift contributions from the analog signal path, and the parallel output mode supports backplane FIFO buffering. The through-hole DIP-28 simplifies bench rework - an ATE integrators can swap failing channels quickly and re-qualify without reflow or hot-air rework.
Recomendado
Medical Patient Monitoring Equipment
Medical monitoring devices such as ECG / EEG patient monitors and infusion-pump controllers can use the LTC1418CN#PBF for analog signal channels where 200 ksps and 14 bits comfortably digitize waveforms up to 25 kHz. The single 5 V supply simplifies medical-grade isolated DC-DC designs, and the SAR architecture's deterministic single-cycle latency keeps timing predictable in feedback loops controlling patient-applied therapy. The integrated precision reference ensures measurement integrity across the device's lifetime without periodic recalibration by field service engineers, which is essential in hospital-grade equipment that must operate continuously.
Recomendado
Legacy Embedded Control Systems
Many embedded control installations remain on 5 V microcontrollers, and the LTC1418CN#PBF drops in cleanly when an 8051, HC11, or similar legacy MCU drives a parallel 14-bit ADC bus. The single 5 V supply avoids the level-shift and charge-pump circuits needed by some newer low-voltage SAR ADCs. The hardware-mode parallel interface simply connects to the MCU data bus, while software selects the channel via chip select and RD lines. Designers retain a 5 V analog signal chain without modernizing the entire system architecture, preserving legacy boards and field-deployed controllers through a single ADC substitution.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LTC1418CN#PBF — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | LTC1418IN#PBF | LTC1418CG#PBF | ADS8401IPFBT | ADC1175CIJM |
|---|---|---|---|---|---|
| Brand | Analog Devices (formerly Linear Technology) | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Package | 28-PDIP (7.62 mm / 0.300 inch) | 28-PDIP (same) | 28-SSOP (not pin-to-pin with PDIP-28) | TQFP-48 (not pin-to-pin) | PDIP-8 (not pin-to-pin, fewer pins) |
| Resolution | 14 bits | 14 bits | 14 bits | 16 bits (+2 bits) | 8 bits (-6 bits) |
| Sampling Rate | 200 ksps | 200 ksps | 200 ksps | 1.25 Msps | 50 Msps |
| Supply Voltage | Single 5 V or ±5 V | Single 5 V or ±5 V | Single 5 V or ±5 V | Single 5 V (analog) / 3 V (digital) | Single 5 V |
| Interface | Parallel (14-bit) / Serial selectable | Parallel / Serial selectable | Parallel / Serial selectable | Serial LVDS (DSP/MCU compatible) | Single-ended (analog) / single logic out |
| Lifecycle / Pin-to-Pin Compatible | Active (last-time-buy per PDN 21_0021), 28-PDIP | Active, 28-PDIP same footprint (drop-in) | Active, 28-SSOP (NOT pin-to-pin) | Active, TQFP-48 (NOT pin-to-pin) | Active, PDIP-8 (NOT pin-to-pin) |
Principais diferenciais
- Only consumer-graded, through-hole, pin-compatible LTC1418 in production (vs LTC1418CG#PBF)
- 14-bit at 200 ksps with only 15 mW - lowest power in its performance tier (vs ADS8401IPFBT)
- Selectable parallel or serial output - one part, two MCU buses (vs ADC1175CIJM)
Notas de projeto
The LTC1418CN#PBF accepts a single 5 V or ±5 V supplies; both analog (AVDD) and digital (VLOGIC) rails should be decoupled with 10 µF bulk plus 100 nF ceramic caps placed within 5 mm of the pins. Estimated: at 200 ksps and 5 V single supply, total quiescent plus dynamic draw is on the order of 3 mA, so linear LDO regulation (e.g. LT1761) is adequate to keep ripple below 1 LSB. Sharing the analog and digital grounds at one point (star-ground) prevents digital switching noise from corrupting the high-speed conversion of low-level analog inputs.
Per Analog Devices PDN 21_0021, the LTC1418CN#PBF is on last-time-buy status; do not design it into new platforms if a long-term supply line is required. The official LTC1418CG#PBF replacement is 28-SSOP and is NOT pin-to-pin compatible with the 28-PDIP footprint, so PCB rework would be needed to migrate. If true drop-in continuity is mandatory, consider third-party inventory or chose an alternative ADC family with active lifecycle and a compatible PDIP-28 footprint.
Keep analog input traces short and routed over a continuous ground plane to minimize coupling from the parallel digital output bus (D0-D13). The SMODE pin (pin 24) selects between parallel and serial output - tie to ground or VLOGIC through 100 kΩ; never leave it floating, because a floating SMODE on power-up will default to undefined bus contention on the parallel data pins. Place 100 nF X7R ceramics on VREF and VREF BYP (pins 2 and 5) to suppress reference-induced DNL errors.
For maximum 14-bit accuracy, clock the conversion start (CONVST pin 26) with a clean low-jitter source and avoid running the digital outputs (D0-D13) simultaneously with sample acquisition. The 200 ksps SAR core achieves its 0.5 LSB DNL spec only when its AVSS and DGND return paths are joined at the package substrate (pin 1 / 8); any daisy-chained ground between distant bypass capacitors reduces dynamic performance. Buffer the analog inputs with op-amps selected for low settling time (e.g. AD825, AD8628) to preserve linearity in multiplexed channels.
Informações de conformidade
PBF suffix confirms lead-free / RoHS-compliant finish per Analog Devices ordering information. Halogen-free status not explicitly stated in the verified web data.
