ISL26324FVZ - 12-bit 250kSPS 4-ch SAR ADC | Renesas
MPN: ISL26324FVZ ✓ Hoạt độngISL26324FVZ Tóm tắt
A SAR ADC operates by performing a binary search through an internal capacitive DAC, comparing the sampled input against successively switched reference levels on each clock cycle. The architecture delivers zero-latency conversions (a single-cycle latency at the digital interface) and excellent linearity over supply and temperature variations. SAR ADCs sit inside the broader data-converter taxonomy between delta-sigma converters (which prioritize resolution at low speeds) and flash converters (which prioritize speed at low resolution), and are typically the preferred choice for multiplexed mid-speed multi-channel acquisition where channel switching on every cycle is acceptable.
Key specifications include ±1 LSB INL and DNL over temperature, throughput up to 250 kSPS in normal mode, integrated input buffers, an SPI-compatible serial interface, and a TSSOP-16 footprint with -40 °C to +85 °C (or extended automotive) operating range. The combination buffer amplifier allows direct connection to high-impedance sensors and to signal-conditioning circuits without external op-amps. Power consumption scales with the configured sample rate, enabling software-managed trade-offs between speed and dissipation.
Typical applications include multi-channel industrial process instrumentation, factory-automation analog input modules, battery-cell voltage monitoring in battery-management systems, programmable logic controller (PLC) analog front-ends, and isolated data-acquisition front-ends. The wide supply range (2.7 V – 5.25 V) also makes the part suitable for 3.3 V and 5 V digital systems that share a common supply rail with downstream logic.
When designing the analog front-end, keep source impedances low and decouple AVDD and DVDD with 10 µF bulk plus 0.1 µF ceramic capacitors placed within 5 mm of the supply pins. The REF input requires a low-noise, low-drift reference; a single REF decoupled with 10 µF and 0.1 µF on the pin delivers rated performance. Use the chip-select pin for multi-device SPI bus sharing, and follow standard SPI mode-0 or mode-3 timing as documented in the datasheet.
This page synthesizes distributor pricing, drop-in alternatives from the same TSSOP-16 SAR family, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho ISL26324FVZ — 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 ISL26324FVZ (cùng hình factor và footprint) — khác nhau ở Package, Input Type, Resolution, Architecture, Mounting Type.
ISL26324FVZ-T7A
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISL26324FVZ-T
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ISL26324FVZ-T7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS7841PBG4
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS8343EB/2K5G4
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7822PBG4
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ISL26324FVZ Tỷ lệ tối đa & tính chất điện
| Number of Bits | 12 bit |
| Tỷ lệ lấy mẫu | 250 kSPS |
| Number of Input Channels | 4 single-ended / 2 differential |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Single-Ended, Differential |
| Analog Supply Voltage | 2.7 V to 5.25 V |
| Digital Interface | SPI-compatible serial |
| Integral Nonlinearity (INL) | ±1 LSB |
| Differential Nonlinearity (DNL) | ±1 LSB |
| Reference Type | External |
| Nhiệt độ hoạt động | -40 °C to +85 °C |
| Hộp | TSSOP-16 |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Cấu hình chân ISL26324FVZ
| Chân 1 | AIN0 — Analog input channel 0 |
| Chân 2 | AIN1 — Analog input channel 1 |
| Chân 3 | AIN2 — Analog input channel 2 |
| Chân 4 | AIN3 — Analog input channel 3 |
| Chân 5 | REF — External reference voltage input |
| Chân 6 | GND — Ground |
| Chân 7 | AVDD — Analog supply voltage |
| Chân 8 | CS — Chip select (active low) |
| Chân 9 | SCLK — Serial clock input |
| Chân 10 | DOUT — Serial data output |
| Chân 11 | DIN — Serial data input |
| Chân 12 | EOC — End-of-conversion flag |
| Chân 13 | DVDD — Digital supply voltage |
| Chân 14 | DGND — Digital ground |
| Chân 15 | RESET — Reset input |
| Chân 16 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
ISL26324FVZ phù hợp cho 6 Áp dụngs: Industrial PLC Analog Input Module, Battery Cell Voltage Monitoring (BMS Front-End), Multi-Channel Sensor Data Acquisition Module, Factory Automation Analog Front-End, Test and Measurement Front-End, Programmable Logic Controller (PLC) Analog Front-End.
Industrial PLC Analog Input Module
The ISL26324FVZ is well suited to industrial PLC analog input modules where 4-20 mA current-loop or 0-10 V voltage signals must be digitized across multiple channels at 250 kSPS aggregate throughput. The part's 4 single-ended (or 2 differential) input channels map directly to typical PLC channel counts, while the proprietary input multiplexer with built-in combination buffer amplifier removes the need for external op-amp buffers per channel, reducing BOM cost and PCB area. The 2.7-5.25 V analog supply matches 24 V-isolated PLC backplane rails after regulation, and ±1 LSB INL/DNL over the -40 °C to +85 °C industrial range preserves measurement accuracy across factory-floor temperature swings. The SPI-compatible interface simplifies galvanic isolation with digital isolators such as the Renesas ISL32740E, enabling complete 4 kV isolation between the PLC logic and field wiring.
Được đề xuất
Battery Cell Voltage Monitoring (BMS Front-End)
The ISL26324FVZ fits battery-management front-ends where individual cell voltages in a multi-cell stack must be sampled sequentially for state-of-charge and state-of-health calculations. The SAR architecture provides zero-latency conversions, allowing the BMS controller to read a channel and act on over-voltage or under-voltage conditions within a single conversion cycle - critical for lithium-ion safety. With 4 single-ended channels, the ISL26324FVZ can monitor a 4-cell Li-ion stack directly, and the 2.7-5.25 V analog supply is compatible with single-cell Li-ion and 12 V lead-acid battery stacks. The combination buffer amplifier handles the high-impedance resistive divider outputs from cell-balancing FETs, eliminating the need for separate op-amp stages between the divider and the ADC input.
Được đề xuất
Multi-Channel Sensor Data Acquisition Module
The ISL26324FVZ is an excellent fit for sensor data acquisition modules that aggregate thermocouple, RTD, strain-gauge, or pressure-sensor signals into a single digital stream. The 4-channel input mux directly handles multiple transducer outputs, while the built-in combination buffer amplifier drives the high source impedances common in bridge-sensor circuits. The 250 kSPS throughput supports oversampling to improve effective resolution beyond the rated 12 bits, a common technique for weighing scales, force measurement, and precision temperature monitoring. The SPI-compatible serial interface allows multiple ISL26324FVZ devices to share a single SPI bus via chip-select, expanding channel counts to 8, 12, 16, or more for high-density instrumentation.
Được đề xuất
Factory Automation Analog Front-End
The ISL26324FVZ fits factory automation analog front-ends that digitize actuator feedback, process variable signals, or motor-drive analog outputs. Its 250 kSPS throughput is fast enough to capture step-response dynamics in servo loops and process-control valves, while the 4-channel input mux handles the multiple feedback paths common in motion-control applications. The part operates from a 2.7-5.25 V supply shared with 3.3 V or 5 V digital logic, simplifying factory automation backplane designs that must interface with PLCs, industrial PCs, or motor controllers. The SPI-compatible interface allows direct connection to industrial microcontroller units without glue logic.
Được đề xuất
Test and Measurement Front-End
The ISL26324FVZ suits test and measurement front-ends where multi-channel signal capture from bench instruments, scope probes, or general-purpose analog inputs is required. Its 12-bit resolution at 250 kSPS allows the part to capture waveforms or transient events across 4 simultaneously-multiplexed channels, while the external reference input accepts precision references for higher accuracy. Combined with an SPI-to-USB bridge IC, the ISL26324FVZ can form the analog input section of a low-cost USB oscilloscope, data logger, or general-purpose data-acquisition card. The TSSOP-16 footprint simplifies integration into compact bench instruments with limited PCB area.
Được đề xuất
Programmable Logic Controller (PLC) Analog Front-End
The ISL26324FVZ directly serves as the analog front-end for PLC input modules, digitizing analog sensor signals from thermocouples, RTDs, pressure transmitters, and flow meters. The 4-channel input multiplexer matches the typical 4 or 8 channels per PLC module, while the 250 kSPS per-channel throughput supports fast process variable updates required for closed-loop control loops. The ±1 LSB INL ensures measurement accuracy for process-control decisions, and the -40 °C to +85 °C operating range supports PLC cabinet temperature environments. The combination buffer amplifier simplifies PCB layout by eliminating external op-amp channels per input, reducing BOM cost and shrinking the analog-input section of the PLC module.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ISL26324FVZ — 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 | ISL26324FVZ-T7A | ISL26324FVZ-T | ADS7841PBG4 | ADS8343EB/2K5G4 | ADS7822PBG4 |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | TSSOP-16 | TSSOP-16 - same | TSSOP-16 - same | TSSOP-16 - same | TSSOP-16 - same | TSSOP-16 - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | |
| Sampling Rate | 250 kSPS | 250 kSPS | 200 kSPS | 100 kSPS | 200 kSPS | |
| Input Channels | 4 SE / 2 DIFF | 4 SE / 2 DIFF | 4 SE / 2 DIFF | 4 SE / 2 DIFF | 1 SE | |
| Architecture | SAR | SAR | SAR | SAR | SAR | |
| Supply Voltage | 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 | 2.7 V to 5.25 V | |
| Interface | SPI-compatible | SPI-compatible | SPI-compatible | SPI-compatible | SPI-compatible | |
| 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 | |
| Unit Price (qty 1) | $7.95 | $7.10 | $5.95 | $6.50 | $3.95 |
Bảo phân biệt quan trọng
- Higher throughput than competing 12-bit TSSOP-16 SAR ADCs (vsADS7841PBG4)
- Integrated combination buffer amplifier (vsADS8343EB/2K5G4)
- Higher channel count than single-channel TSSOP-16 SAR ADCs (vsADS7822PBG4)
Ghi chú thiết kế
Estimated: Decouple AVDD with 10 µF bulk plus 0.1 µF ceramic placed within 5 mm of the pin; place the same combination on DVDD for the digital supply rail. Separate analog and digital ground planes with a single-point star connection near the ADC GND pin to minimize digital switching noise coupling into the analog front-end. Power dissipation scales with sample rate - at 250 kSPS the part draws approximately 8-10 mA from AVDD.
Keep analog input traces short and shielded by a continuous analog ground plane to minimize coupled noise. Place the external reference decoupling (10 µF + 0.1 µF) directly at the REF pin; for low-noise applications use a low-drift external reference such as the Renesas ISL21010 or TI REF5025. Route SPI traces (CS, SCLK, DOUT, DIN) perpendicular to analog input traces where they cross to reduce digital-to-analog crosstalk.
Do not exceed 5.25 V on AVDD or DVDD - over-voltage can permanently damage the SAR input multiplexer. Ensure the source impedance on each analog input is below 1 kΩ to allow the internal sampling capacitor to fully settle within the acquisition window. Verify CS, SCLK, and DOUT timing against the datasheet SPI mode diagrams - mode 0 and mode 3 are both supported, but mode mismatches cause corrupted conversion results. Use the RESET pin on power-up to ensure a clean conversion-ready state.
Thông tin tuân thủ
RoHS and REACH compliant per Renesas product page. Standard -FVZ suffix is not AEC-Q100 qualified; the -T7A automotive-grade variant may be available separately. MSL level not published on datasheet.
