ADS574KPG4 - 12-Bit 40kS/s SAR ADC, 28-PDIP | Texas Instruments
부품 번호: ADS574KPG4 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $38.9 | $38.90 |
| 10 | $33.2 | $332.00 |
| 100 | $27.85 | $2,785.00 |
| 250 | $25.1 | $6,275.00 |
| 500 | $22.4 | $11,200.00 |
ADS574KPG4 개요
An SAR ADC (successive-approximation-register analog-to-digital converter) is a type of data converter that uses a binary-search algorithm and an internal capacitive DAC (CDAC) to convert an analog input voltage to a 12-bit digital code. The SAR architecture occupies the middle ground between flash ADCs (fastest, highest power) and sigma-delta ADCs (highest resolution, lowest bandwidth) and is the dominant topology for 8-16 bit precision conversions up to a few MSPS. The ADS574KPG4 belongs to the precision-converter hierarchy: SAR ADC -> data converter -> ADC -> signal chain -> mixed-signal IC.
Key features include 12-bit resolution, 40 kS/s maximum sampling rate, 25 microseconds maximum acquisition-plus-conversion time, single +5 V supply operation (with optional -15 V for bipolar input range), parallel 12-bit output bus, and 0-70 degrees C commercial operating temperature range. The device is a direct drop-in replacement for the older ADC574 in most new designs, offering internal sampling, lower CMOS power, and a simpler single-supply option.
The converter uses an innovative low-power CMOS capacitor-array DAC (CDAC) architecture that eliminates the need for an external sample-and-hold in most DC and slowly-varying applications. This simplification, combined with the integrated reference and clock, lets designers add 12-bit data acquisition to microprocessor-based systems with a minimal external parts count, while keeping total power well below bipolar ADC574 implementations.
Typical applications include industrial process-control front ends, multiplexed data-acquisition boards, microprocessor-based instrumentation, factory-automation input modules, and legacy 12-bit replacement designs that previously used the ADC574. The 28-PDIP package is convenient for through-hole prototyping, repair, and field-replacement of older systems where SMD parts cannot be retrofitted without a board re-spin.
When designing with the ADS574KPG4, ensure the analog input stays within the specified common-mode range for the chosen unipolar/bipolar mode, decouple the supply pins with 0.1 microfarad and 10 microfarad capacitors placed close to the IC, and observe the 25 microsecond conversion-time budget when sequencing multiple channels through an external multiplexer. Note the parallel bus timing carefully when interfacing to modern microcontrollers, which may require logic-level translation.
This page synthesizes current distributor pricing, drop-in replacement candidates, application guidance, and practical design notes not found in the manufacturer datasheet, helping engineers select and source the ADS574KPG4 efficiently for new and legacy designs.
드롭인 대체품: ADS574KPG4 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: ADS574KPG4 (동일 폼 팩터 및 풋프린트) — 차이점: RoHS Status, Mounting Type, Resolution, Operating Temperature, ADC Architecture.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
ADS574KP
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS574JPG4
✅ 드롭인✓ 재고 있음
$14.5 / 개
데이터시트 보기 →ADS574JPG4
✅ 드롭인✓ 재고 있음
$14.5 / 개
데이터시트 보기 →AD1674BR
✅ 드롭인✓ 재고 있음
$24.1 / 개
데이터시트 보기 →ADS7813UB/1K
✅ 드롭인✓ 재고 있음
$9.85 / 개
데이터시트 보기 →ADS574KPG4 최대 정격 & 전기적 특성
| 분해능 | 12 bits |
| Number of Analog Inputs | 1 (single-ended) |
| ADC Architecture | SAR (Successive Approximation) with capacitive DAC |
| Sampling Rate (max) | 40 kS/s |
| Acquisition + Conversion Time | 25 microseconds (max) |
| Data Interface | Parallel (12-bit) microprocessor-compatible |
| 패키지 / 케이스 | 28-DIP (0.600 in / 15.24 mm) |
| 동작 온도 범위 | 0 degrees C to +70 degrees C |
| Supply Voltage (Digital VDD) | +5 V |
| Reference | Internal |
| Internal Clock | Yes |
| 실장 유형 | Through-Hole |
| Packaging | Tube |
| RoHS 상태 | Compliant (G4 / Pb-free green finish) |
| Lead-Free | Yes |
| Drop-In Replacement For | ADC574 (most applications) |
ADS574KPG4 핀 구성
| 핀 1 | VCC — Analog +12 V (or +5 V in single-supply mode) |
| 핀 2 | ANALOG IN — Analog input (single-ended) |
| 핀 3 | GND — Analog ground |
| 핀 4 | REF OUT — Internal reference output |
| 핀 5 | REF IN — Reference input (decoupled) |
| 핀 6 | BIPOFF — Bipolar offset adjustment |
| 핀 7 | DB11 (MSB) — Parallel data output bit 11 |
| 핀 8 | DB10 — Parallel data output bit 10 |
| 핀 9 | DB9 — Parallel data output bit 9 |
| 핀 10 | DB8 — Parallel data output bit 8 |
| 핀 11 | DB7 — Parallel data output bit 7 |
| 핀 12 | DB6 — Parallel data output bit 6 |
| 핀 13 | DB5 — Parallel data output bit 5 |
| 핀 14 | DB4 — Parallel data output bit 4 |
| 핀 15 | DB3 — Parallel data output bit 3 |
| 핀 16 | DB2 — Parallel data output bit 2 |
| 핀 17 | DB1 — Parallel data output bit 1 |
| 핀 18 | DB0 (LSB) — Parallel data output bit 0 |
| 핀 19 | STS — Status output (conversion complete) |
| 핀 20 | CS — Chip select (active low) |
| 핀 21 | R/C — Read/convert control |
| 핀 22 | CE — Chip enable |
| 핀 23 | VSS — Digital ground |
| 핀 24 | DGND — Digital ground |
| 핀 25 | VDD — Digital +5 V supply |
| 핀 26 | MODE — Mode select (8-bit / 12-bit) |
| 핀 27 | CLK OUT — Internal clock output |
| 핀 28 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
ADS574KPG4 적합 용도: 6 애플리케이션s: Legacy 12-Bit Data Acquisition Front End, Multiplexed Multi-Channel DAQ Boards, Microprocessor-Based Instrumentation, Process Control Analog Input Modules, Field Replacement of Legacy ADC574 Boards, Educational and Prototyping Platforms.
Legacy 12-Bit Data Acquisition Front End
The ADS574KPG4 is a drop-in replacement for the older ADC574 in industrial 12-bit data-acquisition boards. Its integrated reference, internal clock, and 40 kS/s SAR throughput let designers add a 12-bit ADC channel to a microprocessor backplane with only decoupling caps, simplifying the analog front end. The 28-PDIP through-hole package makes the part ideal for repairing, cloning, or maintaining legacy PLC analog input modules where an SMD part cannot be retrofitted. The 25 microsecond conversion time is well within the polling cycle of 8-bit and 16-bit microcontrollers of the era. In new designs the part remains viable for any 12-bit, low-channel-count precision measurement where acquisition speed is secondary to ease of integration and pin compatibility.
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Multiplexed Multi-Channel DAQ Boards
The ADS574KPG4's 40 kS/s sampling rate and 12-bit resolution fit well behind an external analog multiplexer, allowing one ADC to digitize 4, 8, or 16 analog input channels. The integrated reference eliminates the need for an external precision reference on the multiplexer board, reducing both BOM cost and layout area. The parallel 12-bit output bus is straightforward to connect to a CPLD or FPGA that performs channel-address decoding and FIFO buffering, freeing the main microprocessor from tight timing constraints. Each conversion is deterministic at 25 microseconds, so the total board-level throughput is predictable - useful for closed-loop control applications. Designers should place the multiplexer close to the ADS574KPG4's input pin and add a small RC anti-aliasing filter on each channel.
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Microprocessor-Based Instrumentation
The ADS574KPG4's parallel 12-bit bus was designed to interface directly to 8-bit and 16-bit microprocessors and microcontrollers, including 8051 family, 68HC11, and 80C196-class parts. The chip-select, read, write, and conversion-start pins map cleanly to standard memory-mapped or port-mapped peripheral interfaces, so a 12-bit ADC channel can be added to a legacy instrument with only a few lines of driver code. The single +5 V supply option simplifies power design in low-power portable instruments. The 0 to 70 degrees C commercial temperature range is sufficient for laboratory and shop-floor equipment. For new microprocessor designs, however, modern SAR ADCs with SPI/I2C interfaces and SMD packages are easier to integrate and may be preferred unless a parallel interface is specifically required.
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Process Control Analog Input Modules
The ADS574KPG4 is well suited to industrial process-control modules that digitize 4-20 mA or 0-10 V transducer signals, where 12-bit resolution and 40 kS/s throughput are more than adequate. Its CMOS construction keeps power consumption low, important for high-channel-density 24 V loop-powered I/O modules. The internal reference and clock reduce the analog expertise required to bring up a new channel, allowing process-control OEMs to shorten time-to-market. The 28-PDIP package simplifies the through-hole assembly still common in DIN-rail-mounted I/O modules. For wide-temperature-range deployments (-40 to +85 degrees C) or hazardous-location certification, a modern SAR ADC with extended temperature grading may be required, but the ADS574KPG4 remains a viable option for indoor control panels and OEM subsystems.
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Field Replacement of Legacy ADC574 Boards
The ADS574KPG4 is the modern, RoHS-compliant drop-in replacement for the discontinued ADC574 family, making it the natural choice for field repair of legacy boards. Its 28-PDIP footprint and pin-compatible parallel bus mean no layout change is required - the new chip can be soldered into the old footprint directly, and the existing microprocessor firmware continues to work with at most minor timing adjustments. This dramatically reduces mean-time-to-repair for industrial customers who cannot re-spin their boards. The 'G4' lead-free finish simplifies compliance with RoHS-based export and EU sale requirements. Repair shops and OEMs supporting long-life industrial systems should keep stock of the ADS574KPG4 specifically for these drop-in maintenance applications.
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Educational and Prototyping Platforms
The ADS574KPG4 is a useful teaching tool for university electronics and computer-engineering labs because it exposes every key SAR ADC block - reference, CDAC, comparator, SAR register, and parallel bus - in a single through-hole IC. Students can probe the analog input, conversion-start pin, and 12-bit parallel bus with standard lab instruments, observing a real successive-approximation cycle in 25 microseconds. The 28-PDIP package is breadboard-friendly and easy to socket, eliminating the need for reflow equipment in a teaching environment. The 0 to 70 degrees C commercial temperature range is ideal for lab conditions. For modern lab courses that target SMD soldering skills, however, a smaller 12-bit SAR ADC in MSOP-10 or QFN would be a better pedagogical choice.
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추천 제품 요약
엔지니어링 참조 데이터: ADS574KPG4 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ADS574KP | ADS574JPG4 | ADS574JP | AD1674BR | ADS7813UB/1K |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Texas Instruments |
| Package | 28-PDIP | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Data Interface | Parallel 12-bit | Parallel 12-bit | Parallel 12-bit | Parallel 12-bit | Parallel 12-bit | Parallel 16-bit (12-bit used) |
| Internal Reference | Yes | Yes | Yes | Yes | Yes | Yes |
| Internal Clock | Yes | Yes | Yes | Yes | Yes | Yes |
주요 차별점
- Direct drop-in replacement for legacy ADC574 boards (vs ADS574KP)
- Cross-brand 12-bit SAR alternative in identical package (vs AD1674BR)
- Modern faster 12-bit SAR ADC upgrade in same package (vs ADS7813UB/1K)
설계 노트
Decouple the analog VCC and digital VDD pins with both 0.1 microfarad ceramic and 10 microfarad electrolytic capacitors placed as close to the IC as possible. The ADS574KPG4 draws a small fraction of the original ADC574's current thanks to its CMOS design, but switching noise on the digital supply can still couple into the analog input - keep digital and analog grounds tied to a single star point under the IC. Estimated: at +5 V supply and 40 kS/s, average current draw is approximately 15-30 mA depending on output loading, so a standard LDO or 78L05 is sufficient.
Place input decoupling caps, the reference bypass capacitor, and the analog input trace as close to pins 1-5 of the 28-PDIP as possible. Keep the analog input trace short and guarded on both sides with analog ground to reduce digital switching noise pickup from the parallel bus on pins 7-18. The 28-PDIP package is forgiving for hand-wired prototypes, but a small ground plane on the analog side significantly improves noise performance for the 12-bit LSB.
Do not exceed the 0 to +70 degrees C commercial temperature range - if you need industrial -40 to +85 C, choose the ADS574JP (or an equivalent industrial-grade SAR ADC) instead. The bipolar offset adjustment (BIPOFF, pin 6) must be left open in unipolar mode and driven only when the bipolar input range is used; leaving it connected incorrectly in unipolar mode can shift the LSB. Finally, observe the 25 microsecond acquisition-plus-conversion time when sequencing multiple channels - the R/C pin must be high long enough for the internal capacitor DAC to fully settle before each conversion.
규정 준수 정보
RoHS-compliant (G4 / lead-free green finish) per TI product page. AEC-Q100 not applicable - this is a general-purpose industrial/commercial ADC, not automotive-qualified.
