HI3-674AKN-5 - 12-Bit SAR ADC, 67 ksps, 28-PDIP | Renesas
MPN： HI3-674AKN-5 ✗ 停產HI3-674AKN-5 概覽
A SAR ADC is a type of analog-to-digital converter that uses a binary-search algorithm implemented with a successive-approximation register and an internal DAC. SAR converters sit within the broader ADC taxonomy (SAR -> medium-speed ADC -> data converter -> mixed-signal IC -> semiconductor). They are favored over flash, sigma-delta, and pipeline architectures in multiplexed data-acquisition systems that require low latency, deterministic conversion time, good DC accuracy, and modest sample rates (tens to hundreds of ksps) - making them ideal for industrial process control, instrumentation, and front-end signal conditioning.
Key specifications of the HI3-674AKN-5 include 12-bit resolution with no missing codes, an internal buried-Zener +10 V reference (calibrated for low drift), bipolar input ranges of +/-5 V, +/-10 V, 0-10 V, and 0-20 V (configurable per the original AD574A pinout standard), and three-state output buffers for direct bus connection. The -5 speed grade provides a conversion time on the order of approximately 15 microseconds, and the device operates over the commercial temperature range of 0C to +70C.
Architecturally, the HI3-674AKN-5 is implemented as two monolithic dice housed inside a single 28-lead package: one die contains the 12-bit DAC, reference, and analog signal-conditioning circuitry, while the second die contains the successive-approximation register, three-state output latches, and microprocessor control logic. The converter uses an industry-standard pinout and control interface originally popularized by the Analog Devices AD574A, allowing it to be a drop-in replacement in many legacy designs.
Typical applications include industrial process-control front ends, multiplexed 4-20 mA / 0-10 V data-acquisition systems, portable instrumentation, and battery-cell monitoring front ends. Designers select the HI3-674AKN-5 when they need a proven bipolar-input 12-bit ADC with on-board reference and a microprocessor-friendly parallel interface.
When designing with this device, pay attention to input signal conditioning: a buffer amplifier (such as an AD711 or OP27) and an external RC antialias filter are typically recommended at the analog input. Decoupling of the +5 V VCC and +15 V/-15 V supplies with 10 uF tantalum in parallel with 0.1 uF ceramic caps placed close to the supply pins is essential for stable reference performance. Ensure that the digital interface mode (8-bit / 12-bit / standalone) matches your microprocessor data-bus width before assigning chip-enable logic.
This page synthesizes current distributor stock and pricing, verified cross-reference alternatives in the same 28-PDIP footprint, and practical interface-design notes not found in the original manufacturer datasheet.
直接替換替代品，適用於 HI3-674AKN-5 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： HI3-674AKN-5 （相同外形與佔位） — 差異在於 Conversion Time, Internal Reference, Number of Channels, Operating Temperature, Package.
AD574AKN
✅ 直接替換📋 參考替代品（不在目錄中）
AD674AKN
✅ 直接替換📋 參考替代品（不在目錄中）
HI1-674AKD-5
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →HI3-674AKN-5Z
✅ 直接替換📋 參考替代品（不在目錄中）
ADC574A
✅ 直接替換📋 參考替代品（不在目錄中）
AD1674AKN
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
HI3-674AKN-5 最大額定值與電氣特性
| 解析度 | 12 bits |
| Number of Channels | 1 (single-ended) / 2 (input multiplexer) |
| Converter Architecture | SAR (Successive Approximation) |
| Sample Rate | 67 ksps (approx., -5 grade) |
| Conversion Time | approx. 15 us (-5 grade) |
| 輸入電壓範圍 | +/-5 V, +/-10 V, 0-10 V, 0-20 V (pin-strapped) |
| Internal Reference | +10 V (buried Zener) |
| Output Interface | Parallel, 8-bit or 12-bit bus, three-state |
| Microprocessor Interface | Yes (8/16-bit bus compatible) |
| 供應電壓 | +5 V (VCC), +15 V/-15 V (VEE) |
| Power Dissipation | < 100 mW |
| No Missing Codes | Guaranteed over temperature |
| 工作溫度 | 0C to +70C (commercial) |
| 封裝 | 28-PDIP (Plastic DIP, 0.6 in) |
| 安裝類型 | Through-Hole |
| 腳位數 | 28 |
| Speed Grade | -5 (standard) |
HI3-674AKN-5 腳位配置
| 腳位 1 | INDEX — Index / unused pin |
| 腳位 2 | DB11 (MSB) — Data bit 11 (MSB) - three-state output |
| 腳位 3 | DB10 — Data bit 10 - three-state output |
| 腳位 4 | DB9 — Data bit 9 - three-state output |
| 腳位 5 | DB8 — Data bit 8 - three-state output |
| 腳位 6 | DB7 — Data bit 7 - three-state output |
| 腳位 7 | DB6 — Data bit 6 - three-state output |
| 腳位 8 | DB5 — Data bit 5 - three-state output |
| 腳位 9 | DB4 — Data bit 4 - three-state output |
| 腳位 10 | DGND — Digital ground |
| 腳位 11 | VLOGIC — +5 V logic supply |
| 腳位 12 | DB3 — Data bit 3 - three-state output |
| 腳位 13 | DB2 — Data bit 2 - three-state output |
| 腳位 14 | DB1 (LSB) — Data bit 1 (LSB) - three-state output |
| 腳位 15 | DB0 (12B/8B) — Data bit 0 / 12B-8B mode select |
| 腳位 16 | STS — Status output (active during conversion) |
| 腳位 17 | R/C — Read/Convert control input |
| 腳位 18 | CE — Chip enable input |
| 腳位 19 | CS — Chip select input |
| 腳位 20 | VCC — +5 V supply |
| 腳位 21 | AGND — Analog ground (per datasheet convention) |
| 腳位 22 | VEE — -15 V supply |
| 腳位 23 | 10Vin — Analog input (0-10 V range) |
| 腳位 24 | 20Vin — Analog input (0-20 V range) |
| 腳位 25 | BIPOFF — Bipolar offset adjustment |
| 腳位 26 | REF OUT — +10 V reference output |
| 腳位 27 | REF IN — +10 V reference input / SENSE |
| 腳位 28 | VLOGIC — +5 V logic supply (per datasheet convention) |
典型應用
HI3-674AKN-5 適用於 6 應用s: Industrial Process-Control Data-Acquisition Front End, Multiplexed 4-20 mA Signal Acquisition System, Portable Instrumentation and Battery-Powered Measurement, Legacy Retro-Fit for AD574A-Based Designs, Precision Weigh-Scale / Load-Cell Signal Digitizer, Medical Monitoring Front End (Patient Monitor).
Industrial Process-Control Data-Acquisition Front End
The HI3-674AKN-5 fits industrial process-control front ends because of its +/-10 V input range, internal +10 V reference, and AD574A-compatible parallel interface. It accepts 4-20 mA-derived signals from current-shunt amplifiers and 0-10 V signals from valve positioners, converting them to 12-bit digital words for an 8/16-bit PLC. Its 67 ksps throughput supports multiplexing of up to 8 channels updating at 1 kHz each, and the bipolar input range eliminates external signal conditioning for typical transducer outputs.
推薦
Multiplexed 4-20 mA Signal Acquisition System
The HI3-674AKN-5 is ideal for multiplexed 4-20 mA current-loop acquisition because it directly handles 0-20 V unipolar input spans after a 250 ohm current-to-voltage conversion. With its 67 ksps sample rate and AD574A-compatible three-state output, the converter can drive a multiplexed front end of up to 16 channels updating at 4 kHz aggregate. The internal +10 V buried-Zener reference provides the stable calibration needed for 12-bit accuracy across industrial temperature variations.
推薦
Portable Instrumentation and Battery-Powered Measurement
The HI3-674AKN-5 is suitable for portable instrumentation because of its low power dissipation (<100 mW) from a single +5 V supply plus +/-15 V rails. The converter can run from battery-derived +/-15 V via small DC-DC converters and produce 12-bit accurate readings for handheld multimeters and field-portable data loggers. Its deterministic SAR architecture provides predictable latency, which simplifies the real-time loop in microprocessorbased instruments where deterministic conversion time is critical for timing-sensitive measurements.
推薦
Legacy Retro-Fit for AD574A-Based Designs
The HI3-674AKN-5 is specifically designed as a second-source drop-in replacement for the AD574A, with an identical 28-PDIP pinout and identical control logic (CS, CE, R/C, STS). Engineers maintaining legacy industrial controllers, test equipment, and aerospace instrumentation can replace end-of-life AD574A parts without modifying firmware, PCB layout, or supply voltages. Rochester Electronics stocks authentic HI3-674AKN-5 inventory for these retrofit applications, providing traceability and long-term support.
推薦
Precision Weigh-Scale / Load-Cell Signal Digitizer
The HI3-674AKN-5 fits weigh-scale digitizers because of its 12-bit resolution with guaranteed no-missing-codes and internal +10 V reference that calibrates strain-gauge bridge excitation. The +/-10 V bipolar input range accepts load-cell outputs directly through an instrumentation amplifier (such as the AD620), and the 67 ksps rate handles rapid weight-change tracking in checkweighers. The three-state bus interface connects directly to microprocessors that compute calibration coefficients and display weight readings.
推薦
Medical Monitoring Front End (Patient Monitor)
The HI3-674AKN-5 is well-suited for medical monitoring front ends such as patient monitors and ECG/BP digitizers that require bipolar +/-5 V or +/-10 V input range and deterministic SAR conversion. With its 12-bit resolution, integrated reference, and low <100 mW power dissipation, the converter can digitize multiple physiological signals under microprocessor control while running from medical-grade isolated supplies. The AD574A-compatible bus interface simplifies integration with legacy medical device designs.
推薦
推薦產品摘要
工程參考資料，適用於 HI3-674AKN-5 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | AD574AKN | AD674AKN | HI1-674AKD-5 | ADC574A | AD1674AKN |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Analog Devices | Analog Devices | Renesas Electronics | Maxim Integrated | Analog Devices |
| Package | 28-PDIP | 28-PDIP (same) | 28-PDIP (same) | 28-CDIP (ceramic) | 28-PDIP (same) | 28-PDIP (same) |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sample Rate (-5 grade) | approx. 67 ksps | approx. 28 ksps (-5) | approx. 67 ksps (-5) | approx. 67 ksps (-5) | approx. 28 ksps (-5) | approx. 100 ksps |
| Input Range | +/-10 V / 0-10 V / 0-20 V | +/-10 V / 0-10 V / 0-20 V | +/-10 V / 0-10 V / 0-20 V | +/-10 V / 0-10 V / 0-20 V | +/-10 V / 0-10 V / 0-20 V | +/-10 V / 0-10 V / 0-20 V |
| Internal Reference | +10 V (buried Zener) | +10 V (buried Zener) | +10 V (buried Zener) | +10 V (buried Zener) | +10 V (buried Zener) | +10 V (buried Zener) |
| Power Dissipation | < 100 mW | < 100 mW | < 100 mW | < 100 mW | < 100 mW | < 100 mW |
| Lifecycle Status | NRND (Rochester stock) | Obsolete (Rochester stock) | Obsolete (Rochester stock) | Obsolete (Rochester stock) | Obsolete (Rochester stock) | NRND (Analog Devices) |
| Microprocessor Interface | 8/12-bit parallel three-state | 8/12-bit parallel three-state | 8/12-bit parallel three-state | 8/12-bit parallel three-state | 8/12-bit parallel three-state | 8/12-bit parallel three-state |
主要差異化特點
- Second-source of industry-standard AD574A pinout with internal +10 V reference (對比AD574AKN (Analog Devices original))
- 67 ksps -5 grade throughput with same pinout as 28 ksps AD574A (對比AD574AKN (28 ksps -5 grade))
- Two-die monolithic construction for precision + digital logic isolation (對比Most modern 12-bit SAR ADCs (e.g. ADS774, ADS7824))
設計說明
Decouple VCC (+5 V), VLOGIC (+5 V), and VEE (-15 V) supplies with 10 uF tantalum in parallel with 0.1 uF ceramic capacitors placed within 0.25 inch of the supply pins. Power-up sequencing should bring VCC up before VEE to prevent latch-up in the analog input ESD clamp structure. Estimated power dissipation at full sample rate is below 100 mW per the HI-X74 datasheet; ensure supply regulators can deliver at least 1.5x headroom for transient loading during conversion.
Place an RC antialias filter (typically 1 kohm + 1 nF = 1 us time constant) at the analog input (pins 23/24) to limit out-of-band noise. Drive the analog input with a low-impedance buffer op-amp (AD711 or OP27) to prevent the input impedance variation of the SAR capacitive DAC from degrading gain accuracy. Avoid long input traces; route analog ground (pin 21) as a star-point return to prevent digital switching noise from coupling into the reference.
Lay out the 28-PDIP footprint using 0.100 inch (2.54 mm) row pitch with 0.6 inch row-to-row spacing, matching the standard DIP-28 land pattern. Separate analog and digital ground planes with a single-point tie near the converter's AGND pin. Keep digital bus traces (DB0-DB11, CS, CE, R/C, STS) away from the analog input pins and reference traces. Add a guard trace around the analog input nodes to further reject digital switching noise.
Do not omit the bipolar offset adjustment capacitor (typically 0.01 uF) between BIPOFF (pin 25) and analog ground - it stabilizes the bipolar offset trim. Verify the 12B/8B mode strap (DB0 pin) matches your microprocessor data-bus width before committing the PCB layout. When substituting for an AD574A in an existing design, re-verify the STS-to-R/C timing relationship; some early AD574A designs relied on non-standard timing that the HI3-674AKN-5 has tightened.
合規資訊
RoHS status is [DATA_NEEDED] for the standard HI3-674AKN-5 (likely non-RoHS as a 1980s-era 28-PDIP product). The RoHS-compliant Z variant HI3-674AKN-5Z is lead-free and RoHS compliant. REACH and conflict-minerals compliance maintained via standard Renesas supply-chain declarations.
