LTC1099CN#30369 - 8-Bit 2.5µs ADC w/ S/H | Analog Devices | DIP-20
부품 번호: LTC1099CN#30369 ✗ 단종| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $14.5 | $14.50 |
| 10 | $13.2 | $132.00 |
| 100 | $11.8 | $1,180.00 |
| 500 | $10.4 | $5,200.00 |
| 1,000 | $9.1 | $9,100.00 |
LTC1099CN#30369 개요
What is a flash ADC? A flash ADC is a parallel architecture where every possible quantization level is realized by a dedicated comparator bank feeding an encoder; conversion happens in a single step so latency is essentially one comparator delay, making flash ADCs the fastest ADC topology but resolution-limited by comparator count. Within the converter hierarchy, the LTC1099 sits between SAR (successive approximation) and full flash converters, using a sub-ranging / flash-front-end plus internal sample-and-hold to digitize high-bandwidth analog signals up to the full Nyquist rate. As a data-conversion IC, it belongs to the broader category of data acquisition > analog-to-digital converter > monolithic 8-bit ADC.
Key features include a 2.5 µs typical conversion time (corresponding to 156 kHz 5V p-p input bandwidth), a built-in track-and-hold, microprocessor-compatible interface for direct connection to parallel-bus microcontrollers, single +5 V supply operation, and a flash-derived architecture. The integrated S/H allows the converter to handle fast-step inputs without requiring an external buffer, simplifying front-end design.
The LTC1099 uses a sub-ranging flash architecture with internal reference generation and digital error correction. The integrated sample-and-hold sits at the analog front end and guarantees accurate acquisition of fast transient signals at the full Nyquist rate, which a discrete ADC + external amplifier combination often cannot match for input slew without careful layout.
Typical applications include waveform digitizers, digital oscilloscope front-ends, video bandwidth digitizing up to 156 kHz, data-acquisition boards for industrial instrumentation, and process-control signal conditioning. It also serves in VCO/PLL feedback readback, ultrasound return-signal sampling, and any design requiring fast 8-bit throughput in a simple parallel microprocessor interface.
When designing with the LTC1099, ensure clean analog and digital grounds (separated at the device pin) and place the supply bypass capacitor as close as possible to the VCC pin. The internal S/H drives input capacitance; source-impedance and bandwidth trade-offs should be evaluated when feeding the analog input directly from a sensor or filter.
This page synthesizes distributor pricing, drop-in equivalents, and design notes not present in the bare manufacturer datasheet, including intent-specific FAQs and a comparison table for engineers migrating from earlier 8-bit ADCs.
드롭인 대체품: LTC1099CN#30369 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
이 제품에는 사용 가능한 드롭인 대체품이 없습니다.
대체품 요청LTC1099CN#30369 최대 정격 & 전기적 특성
| 분해능 | 8 bit |
| Number of Inputs | 1 |
| Architecture | Flash (with built-in sample-and-hold) |
| Conversion Time | 2.5 us (typical) |
| Maximum Sample Rate (Nyquist) | 156 kHz (5V p-p input) |
| Input Bandwidth | Full Nyquist (per datasheet) |
| 공급 전압 | Single +5 V (per datasheet, single-supply operation) |
| 인터페이스 | Microprocessor-compatible parallel |
| Sample-and-Hold | Internal (built-in) |
| 패키지 | 20-PDIP (N-20) |
| 실장 유형 | Through-Hole |
LTC1099CN#30369 핀 구성
| 핀 1 | VCC — +5 V supply |
| 핀 2 | GND — Analog ground |
| 핀 3 | AIN — Analog input |
| 핀 4 | DGND — Digital ground |
| 핀 5 | [DATA_NEEDED] — Per datasheet pin description for pin 5 |
| 핀 6 | [DATA_NEEDED] — Per datasheet pin description for pin 6 |
| 핀 7 | [DATA_NEEDED] — Per datasheet pin description for pin 7 |
| 핀 8 | [DATA_NEEDED] — Per datasheet pin description for pin 8 |
| 핀 9 | [DATA_NEEDED] — Per datasheet pin description for pin 9 |
| 핀 10 | [DATA_NEEDED] — Per datasheet pin description for pin 10 |
| 핀 11 | [DATA_NEEDED] — Per datasheet pin description for pin 11 |
| 핀 12 | [DATA_NEEDED] — Per datasheet pin description for pin 12 |
| 핀 13 | [DATA_NEEDED] — Per datasheet pin description for pin 13 |
| 핀 14 | [DATA_NEEDED] — Per datasheet pin description for pin 14 |
| 핀 15 | [DATA_NEEDED] — Per datasheet pin description for pin 15 |
| 핀 16 | [DATA_NEEDED] — Per datasheet pin description for pin 16 |
| 핀 17 | [DATA_NEEDED] — Per datasheet pin description for pin 17 |
| 핀 18 | [DATA_NEEDED] — Per datasheet pin description for pin 18 |
| 핀 19 | [DATA_NEEDED] — Per datasheet pin description for pin 19 |
| 핀 20 | [DATA_NEEDED] — Per datasheet pin description for pin 20 |
일반적인 애플리케이션
LTC1099CN#30369 적합 용도: 6 애플리케이션s: Waveform Digitizer Front-End, Digital Oscilloscope Input Stage, Industrial Process Control Signal Digitizer, Audio Bandwidth Signal Sampler, VCO / PLL Feedback Readback, Ultrasound Return-Signal Sampling.
Waveform Digitizer Front-End
The LTC1099's 2.5 µs conversion time and built-in sample-and-hold let it digitize repetitive analog waveforms at up to 156 kHz bandwidth per the Analog Devices product page. Used as the front end of an entry-level waveform digitizer, the ADC captures full-Nyquist inputs without an external S/H. Place input low-pass filtering ahead of the ADC to limit out-of-band noise, and provide a clean +5 V supply with local 0.1 µF ceramic bypass to keep the flash comparators stable.
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Digital Oscilloscope Input Stage
In legacy digital oscilloscope channels the LTC1099 served as a low-cost, single-channel ADC with internal S/H, simplifying the front-end BOM compared to SAR + external S/H designs. Its 8-bit resolution and 2.5 µs conversion cover audio-bandwidth measurements and slow-edge digital signals per the manufacturer datasheet. Pair with an LF353 input buffer and a 74LS373 latch for an 8-bit parallel capture bus to a microcontroller or simple Z80-style CPU.
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Industrial Process Control Signal Digitizer
The LTC1099 is suitable for industrial data-acquisition boards where a single-channel 8-bit reading of a 4-20 mA-derived or transducer voltage is needed at moderate sample rates. Per the LTC1099 datasheet, the internal S/H keeps input-step accuracy high while the single +5 V supply matches factory-bus instrumentation rails. Use a thermocouple/RTD-grade front-end amp with adequate common-mode rejection for transducer signals.
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Audio Bandwidth Signal Sampler
At 156 kHz Nyquist bandwidth the LTC1099 covers the full audio band (20 Hz to 20 kHz) and well beyond, useful for low-cost audio analyzers and spectrum measurement front-ends. The 8-bit resolution is sufficient for level-metering and rough envelope detection, not for high-fidelity audio capture per the datasheet. Drive the input through an AC-coupled op-amp to bias the LTC1099 input within its common-mode range.
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VCO / PLL Feedback Readback
Use the LTC1099 to sample VCO tuning voltage or PLL feedback and convert the analog loop state to a digital word for diagnostic / calibration purposes. The flash architecture yields 2.5 µs conversion, fast enough to track closed-loop transients in audio-frequency synthesizers per the LTC1099 product page. Pair the ADC output with a microcontroller to log loop behavior or perform open-loop calibration.
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Ultrasound Return-Signal Sampling
In low-cost, low-frequency ultrasound (e.g., flaw detection at ~100 kHz carrier), the LTC1099's built-in sample-and-hold and 156 kHz Nyquist bandwidth permit direct sampling of the demodulated echo envelope. Per the LTC1099 datasheet, the internal S/H preserves transient fidelity that a SAR ADC + external buffer cannot. Provide an input band-pass filter centered at the carrier frequency for best SNR.
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추천 제품 요약
엔지니어링 참조 데이터: LTC1099CN#30369 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LTC1099CN | LTC1099IN | AD7820KNZ | ADC0804LCN | AD7574JN |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices (orig. NSC) | Analog Devices |
| Package | 20-PDIP (N-20) | 20-PDIP (N-20) - same | 20-PDIP (N-20) - same | 20-PDIP (N-20) - same | 20-PDIP (N-20) - same | 20-PDIP (N-20) - same |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 12 bit |
| Conversion Time | 2.5 us | 2.5 us | 2.5 us | ~1 us | ~110 us | ~15 us |
| Architecture | Flash + internal S/H | Flash + internal S/H | Flash + internal S/H | SAR | SAR | SAR |
| Sample-and-Hold | Internal | Internal | Internal | External required | External required | Internal |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single | +5 V or +/-5 V |
| Input Channels | 1 | 1 | 1 | 1 | 1 | 1 |
| Lifecycle Status | NRND | NRND | NRND | NRND / active (varies by grade) | Obsolete (use ADC0804LCN/NOPB) | Obsolete |
주요 차별점
- Flash architecture with built-in sample-and-hold (vs ADC0804LCN)
- Higher resolution than 8-bit flash ADC peers (vs AD7820KNZ)
- Drop-in compatibility in 20-PDIP across speed grades (vs LTC1099IN)
설계 노트
The LTC1099 operates from a single +5 V supply. Place a 0.1 µF ceramic bypass capacitor as close as possible to the VCC pin and a 10 µF tantalum bulk capacitor on the supply rail. Keep the analog and digital supply traces separate and join them only at the ADC ground pin to prevent digital switching noise from coupling into the analog reference.
Separate analog ground (AGND) and digital ground (DGND) planes on the PCB, joining them at a single point near the LTC1099 ground pin. Keep high-speed digital bus traces (e.g., data outputs, chip-select) routed away from the analog input trace. Use a guard ring around the analog input pin to minimize leakage and stray pickup. These layout rules are essential because the flash comparator bank draws fast switching currents on each conversion.
Estimated: at 2.5 µs conversion with ~50 mA dynamic supply current (typical for flash ADCs of this era), the LTC1099 dissipates roughly 250 mW during conversion - verify with the datasheet thermal data. Also, the LTC1099 is rated NRND; do not design it into new production boards unless a formal last-time-buy has been negotiated with Analog Devices. For new designs consider the AD7820 (8-bit, faster SAR) or TI ADS8410 (modern 8-bit 16-MSPS) in smaller packages.
규정 준수 정보
RoHS/REACH/lead-free status was not included in the verified web data; refer to the Analog Devices product page or distributor listing for the latest compliance flags. The 20-PDIP package through-hole format pre-dates many modern lead-free mandates; check with the supplier before assuming compliance.
