ADS7822PG4 - 12-Bit 200kSPS Micropower ADC | Texas Instruments
부품 번호: ADS7822PG4 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $5.45 | $5.45 |
| 10 | $4.91 | $49.10 |
| 100 | $4.36 | $436.00 |
| 500 | $3.71 | $1,855.00 |
| 1,000 | $3.2 | $3,200.00 |
ADS7822PG4 개요
An SAR ADC is a type of analog-to-digital converter that uses a binary-search algorithm against a precision DAC and comparator to resolve each input sample in N clock cycles. SAR ADCs are prized for their deterministic latency (no pipeline delay), excellent DC accuracy, and inherently low noise floor at moderate sample rates. The ADS7822 sits within the broader taxonomy of data converters -> ADCs -> SAR ADCs -> precision/low-power SAR ADCs, serving applications that demand a clean, accurate single-shot conversion without the overhead of a complex digital interface.
Key features include 12-bit resolution with no missing codes, a single 2.7 V to 5.25 V analog supply, a synchronous serial (SPI/QSPI/MICROWIRE-compatible) digital interface, an analog input range of 0 V to VREF (or 0 V to VDD with internal reference), and an internal 2.5 V reference option. Power consumption is typically 1.6 mW at 200 kSPS with a 5 V supply, and the part automatically powers down between conversions for energy-efficient duty-cycled operation.
Architecturally, the converter combines a capacitive-charge-distribution DAC, a high-bandwidth comparator, a SAR, and an on-chip reference. The internal clock does not require an external oscillator, simplifying PCB routing. The 8-pin PDIP package is pin-compatible with legacy through-hole designs and is also available in SOIC-8 and MSOP-8 versions of the same silicon, allowing easy migration between through-hole and surface-mount assemblies without re-layout.
Typical applications include portable instrumentation, battery-powered data loggers, isolated sensor front ends, pen-digitizers and touch-screen controllers, point-of-sale terminals, and general-purpose analog signal conditioning in microcontroller-based systems. The wide supply range and micropower operation make it a strong fit for any 3.3 V or 5 V mixed-signal design.
When designing with this device, ensure the analog input source drives a low-impedance buffer to avoid ADC drive-induced gain errors, and decouple AVDD with a 10 µF tantalum plus 0.1 µF ceramic combination placed within 5 mm of the supply pin. The serial interface is straightforward but requires precise SCLK timing - review TI's timing diagrams before connecting it to a microcontroller.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes that complement the manufacturer datasheet, helping engineers select and qualify the ADS7822PG4 quickly.
드롭인 대체품: ADS7822PG4 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: ADS7822PG4 (동일 폼 팩터 및 풋프린트) — 차이점: Data Interface, Package, Sampling Rate, RoHS Status, Number of Input Channels.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
ADS7822PBG4
✅ 드롭인✓ 재고 있음
$2.1 / 개
데이터시트 보기 →ADS7822PBG4
✅ 드롭인✓ 재고 있음
$2.1 / 개
데이터시트 보기 →ADS7813PG4
✅ 드롭인✓ 재고 있음
$18.75 / 개
데이터시트 보기 →ADS7805PG4
✅ 드롭인✓ 재고 있음
$17.9 / 개
데이터시트 보기 →ADS7806PG4
✅ 드롭인✓ 재고 있음
$13.2 / 개
데이터시트 보기 →ADS7822PG4 최대 정격 & 전기적 특성
| 분해능 | 12 bits |
| Sample Rate | 200 kSPS |
| Number of Input Channels | 1 single-ended |
| Architecture | SAR (Successive Approximation) |
| Supply Voltage Range | 2.7 V to 5.25 V |
| Analog Input Range | 0 V to VREF (or 0 V to VDD with internal reference) |
| Internal Reference | 2.5 V (typ) |
| Power Consumption | 1.6 mW at 200 kSPS, 5 V supply (typ) |
| Auto Power-Down | Yes (between conversions) |
| Digital Interface | SPI / QSPI / MICROWIRE-compatible synchronous serial |
| No Missing Codes | 12-bit guaranteed |
| 동작 온도 | -40 °C to +85 °C |
| 패키지 | 8-PDIP (P) |
| 실장 유형 | Through-Hole |
| RoHS 상태 | Compliant (Pb-free suffix G4) |
ADS7822PG4 핀 구성
| 핀 1 | VIN — Analog input (0 V to VREF) |
| 핀 2 | GND — Analog ground |
| 핀 3 | REF — Reference input/output (internal 2.5 V) |
| 핀 4 | VDD — Analog supply (2.7 V to 5.25 V) |
| 핀 5 | /CS — Chip select, active low |
| 핀 6 | DOUT — Serial data output (SPI) |
| 핀 7 | SCLK — Serial clock input |
| 핀 8 | GND — Digital ground (tie to pin 2) |
일반적인 애플리케이션
ADS7822PG4 적합 용도: 6 애플리케이션s: Portable Instrumentation & Data Loggers, Isolated Sensor Front Ends, Pen Digitizers and Touch-Screen Controllers, Point-of-Sale Terminals, General-Purpose 12-bit Mixed-Signal Designs, Industrial Process Monitor Channels.
Portable Instrumentation & Data Loggers
The ADS7822PG4's 1.6 mW typical dissipation at 200 kSPS and automatic power-down between conversions make it ideal for portable, battery-powered instrumentation. With its 2.7 V minimum supply, the converter runs directly from a single lithium coin cell or 3.3 V regulator, supporting thousands of hours of duty-cycled measurement. Unlike higher-speed pipeline ADCs, the SAR architecture provides deterministic single-shot conversion latency, simplifying event-triggered logging firmware. Designers typically place the ADS7822PG4 between a sensor signal conditioner and an MSP430 or similar low-power MCU, sampling analog inputs at 200 kSPS bursts before returning to microampere sleep current.
추천
Isolated Sensor Front Ends
The ADS7822PG4's synchronous serial interface and unipolar 0-VREF input simplify galvanic isolation design because the digital SPI link can cross an optocoupler or digital isolator with only four signal lines (CS, SCLK, DOUT, GND). At 200 kSPS, the throughput supports high-bandwidth transducer front ends for strain gauges, pressure sensors, and temperature bridges. The 12-bit no-missing-codes performance and integrated 2.5 V reference keep calibration error low without external precision components, reducing BOM cost and PCB area on the isolated side of the barrier.
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Pen Digitizers and Touch-Screen Controllers
Touch-screen and pen-digitizer designs benefit from the ADS7822PG4's single-channel SAR architecture with sub-microsecond acquisition, which can sample resistive touch coordinates faster than mechanical stylus motion. The 12-bit resolution yields 4096 steps across a typical 4-wire resistive panel, providing <0.025 % positional accuracy. Its micropower operation keeps standby current negligible between stylus events, and its SPI interface ties directly into most touch controllers and embedded MCUs without glue logic. The 8-PDIP package is friendly to prototyping and rework on touch-panel evaluation fixtures.
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Point-of-Sale Terminals
POS terminals require reliable analog sampling of card-reader sensors, battery monitors, and printer temperature while drawing minimal quiescent current from the main battery. The ADS7822PG4's 2.7-5.25 V supply range, automatic power-down, and 12-bit resolution meet these requirements in a compact 8-PDIP footprint that fits legacy through-hole POS mainboards. The internal 2.5 V reference simplifies ratiometric battery monitoring without adding extra components, while the SPI interface shares bus pins with displays and contactless card readers, reducing pin count at the host MCU.
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General-Purpose 12-bit Mixed-Signal Designs
For any 3.3 V or 5 V microcontroller-based system that needs a precision 12-bit analog channel, the ADS7822PG4 is a straightforward building block. It works equally well at full 200 kSPS for control loops or down at 1 kSPS for slowly varying signals, automatically scaling power with throughput. Designers value its deterministic SAR latency, which avoids the unpredictable delays of pipeline or sigma-delta converters in real-time control. With an 8-PDIP footprint compatible with DIP sockets, the part is also a teaching-grade and hobby-friendly ADC for universities and maker projects.
추천
Industrial Process Monitor Channels
Process-monitoring PLCs and SCADA modules often need an isolated, low-speed analog front end per channel. The ADS7822PG4's -40 °C to +85 °C industrial temperature rating and 12-bit no-missing-codes guarantee across that range make it a solid choice for thermocouple, RTD, or 4-20 mA loop digitization at modest rates. The micropower operation allows many channels to be multiplexed behind a single low-power regulator. Combined with an external op-amp input conditioner and the internal 2.5 V reference, the ADS7822PG4 delivers factory-floor accuracy without expensive precision components.
추천
추천 제품 요약
엔지니어링 참조 데이터: ADS7822PG4 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ADS7822PBG4 | ADS7822P | ADS7813PG4 | ADS7805PG4 | ADS7806PG4 |
|---|---|---|---|---|---|---|
| Package | 8-PDIP (P) | 8-PDIP (P) - same | 8-PDIP (P) - same | 8-PDIP (P) - same | 8-PDIP (P) - same | 8-PDIP (P) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sample Rate | 200 kSPS | 200 kSPS | 200 kSPS | 40 kSPS | 100 kSPS | 200 kSPS |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 4.5 V to 5.25 V | 4.5 V to 5.25 V |
| Input Range | 0 V to VREF (unipolar) | 0 V to VREF | 0 V to VREF | 0 V to VREF | 0 V to VREF | ±10 V bipolar |
| Interface | SPI / QSPI / MICROWIRE | SPI | SPI | SPI | Parallel | Parallel |
| RoHS / Lead-Free | Yes (G4 suffix) | Yes | SnPb / non-RoHS | Yes | Yes | Yes |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
주요 차별점
- 200 kSPS at 1.6 mW - one of the lowest power-per-sample rates in 12-bit SAR ADCs (vs ADS7813PG4)
- Through-hole 8-PDIP package friendly to breadboarding and educational use (vs ADS7817UBG4)
- Integrated 2.5 V reference reduces BOM for ratiometric measurements (vs ADS7805PG4)
설계 노트
Decouple the VDD pin (pin 4) with a 10 µF tantalum in parallel with a 0.1 µF ceramic placed within 5 mm of the pin. The micropower auto-power-down feature relies on clean supply rails - noisy VDD directly couples into the reference and degrades ADC noise performance. Estimated: with 10 µF bulk, digital transients from a nearby MCU toggling at 20 MHz stay below 5 mV peak on VDD, preserving 12-bit ENOB margin.
Tie both GND pins (2 and 8) together at the PCB ground pour directly under the package. Use a star-ground topology for the analog input trace to avoid sharing return paths with digital SPI signals. Place the REF decoupling capacitor (0.1 µF) as close as possible to pin 3; long traces on REF will inject kickback noise into the next conversion and degrade linearity.
Do not drive the VIN pin directly from a high-impedance source (>5 kΩ). The ADC's switched-capacitor input draws transient charge during acquisition, and inadequate drive causes gain error and distortion. Buffer the input with a low-offset, low-noise op-amp such as the OPA333 or OPA2333. Avoid exceeding the absolute maximum analog input voltage of VDD + 0.3 V - exceeding this can permanently damage the input ESD structure.
규정 준수 정보
The G4 suffix on ADS7822PG4 indicates a Pb-free / RoHS-compliant ordering code per TI product marking conventions. AEC-Q100 qualification is not applicable - this is a general-purpose industrial ADC.
