HI3-674AKN-5 - 12-Bit SAR ADC, 67 ksps, 28-PDIP | Renesas
MPN: HI3-674AKN-5 ✗ Cuối đờiHI3-674AKN-5 Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho HI3-674AKN-5 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với HI3-674AKN-5 (cùng hình factor và footprint) — khác nhau ở Conversion Time, Internal Reference, Number of Channels, Operating Temperature, Package.
AD574AKN
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD674AKN
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
HI1-674AKD-5
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →HI3-674AKN-5Z
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADC574A
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD1674AKN
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
HI3-674AKN-5 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 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) |
| Phạm vi điện áp đầu vào | +/-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) |
| Điện áp cung cấp | +5 V (VCC), +15 V/-15 V (VEE) |
| Power Dissipation | < 100 mW |
| No Missing Codes | Guaranteed over temperature |
| Nhiệt độ hoạt động | 0C to +70C (commercial) |
| Hộp | 28-PDIP (Plastic DIP, 0.6 in) |
| Kiểu lắp đặt | Through-Hole |
| Số chân | 28 |
| Speed Grade | -5 (standard) |
Cấu hình chân HI3-674AKN-5
| Chân 1 | INDEX — Index / unused pin |
| Chân 2 | DB11 (MSB) — Data bit 11 (MSB) - three-state output |
| Chân 3 | DB10 — Data bit 10 - three-state output |
| Chân 4 | DB9 — Data bit 9 - three-state output |
| Chân 5 | DB8 — Data bit 8 - three-state output |
| Chân 6 | DB7 — Data bit 7 - three-state output |
| Chân 7 | DB6 — Data bit 6 - three-state output |
| Chân 8 | DB5 — Data bit 5 - three-state output |
| Chân 9 | DB4 — Data bit 4 - three-state output |
| Chân 10 | DGND — Digital ground |
| Chân 11 | VLOGIC — +5 V logic supply |
| Chân 12 | DB3 — Data bit 3 - three-state output |
| Chân 13 | DB2 — Data bit 2 - three-state output |
| Chân 14 | DB1 (LSB) — Data bit 1 (LSB) - three-state output |
| Chân 15 | DB0 (12B/8B) — Data bit 0 / 12B-8B mode select |
| Chân 16 | STS — Status output (active during conversion) |
| Chân 17 | R/C — Read/Convert control input |
| Chân 18 | CE — Chip enable input |
| Chân 19 | CS — Chip select input |
| Chân 20 | VCC — +5 V supply |
| Chân 21 | AGND — Analog ground (per datasheet convention) |
| Chân 22 | VEE — -15 V supply |
| Chân 23 | 10Vin — Analog input (0-10 V range) |
| Chân 24 | 20Vin — Analog input (0-20 V range) |
| Chân 25 | BIPOFF — Bipolar offset adjustment |
| Chân 26 | REF OUT — +10 V reference output |
| Chân 27 | REF IN — +10 V reference input / SENSE |
| Chân 28 | VLOGIC — +5 V logic supply (per datasheet convention) |
Ứng dụng tiêu biểu
HI3-674AKN-5 phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho HI3-674AKN-5 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Second-source of industry-standard AD574A pinout with internal +10 V reference (vsAD574AKN (Analog Devices original))
- 67 ksps -5 grade throughput with same pinout as 28 ksps AD574A (vsAD574AKN (28 ksps -5 grade))
- Two-die monolithic construction for precision + digital logic isolation (vsMost modern 12-bit SAR ADCs (e.g. ADS774, ADS7824))
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
