ISL26315FVZ-T7A - 12-bit 125kSPS 4-CH SAR ADC | Renesas
MPN: ISL26315FVZ-T7A ✓ Hoạt độngISL26315FVZ-T7A Tóm tắt
A SAR ADC is a successive-approximation-register analog-to-digital converter that performs one conversion per clock cycle using a binary-search algorithm against an internal precision DAC, then digitizes a single input sample per acquisition. Unlike delta-sigma ADCs, SAR converters offer deterministic latency, no pipeline delay, and excellent DC accuracy, which is why they dominate multiplexed data acquisition, industrial process control, and precision instrumentation. The ISL26315FVZ-T7A fits the SAR -> ADC -> data converter -> signal chain IC hierarchy.
Key parametric features include ±1 LSB INL/DNL (max), 4 single-ended analog inputs routed through an internal MUX, an SPI/QSPI/MICROWIRE-compatible serial interface, and a hardware pin-selectable sequencer that cycles through pre-programmed input channels. The device supports both unipolar (0 to VREF) and bipolar (programmed through input scaling) input ranges by changing the reference voltage.
Architecturally, the ISL26315FVZ-T7A uses a charge-redistribution DAC array with a high-impedance input stage. The internal buffer allows direct connection to high-impedance sources, while the SAR engine completes a 12-bit conversion in 8 µs. Power consumption scales linearly with sample rate, drawing roughly 3 mA at 125 kSPS and dropping into the µA range at lower throughput, enabled by an automatic power-down between conversions.
Typical applications include industrial process control, battery-powered instrumentation, multi-channel sensor monitoring (temperature, pressure, strain gauges), and portable medical devices. The wide supply range and internal buffer make it ideal for monitoring multiple transducers with one ADC.
Design consideration: place a 10 µF tantalum plus 0.1 µF ceramic bypass close to pins 13 (AVDD) and 2 (DVDD), and keep the analog ground return isolated from digital switching currents. Decoupling and short analog traces are critical for meeting the ±1 LSB linearity spec.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho ISL26315FVZ-T7A — 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 ISL26315FVZ-T7A (cùng hình factor và footprint) — khác nhau ở Number of Input Channels, Input Type, Package, Interface, RoHS Status.
ISL26312FVZ-T
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ISL26311FBZ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ISL26314FVZ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →AD7993BRU-0REEL
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7822PG4
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ISL26315FVZ-T7A Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bits |
| Sample Rate | 125 kSPS |
| Number of Input Channels | 4 single-ended (1 differential option) |
| ADC Architecture | SAR |
| Input Type | Single-ended |
| Analog Supply Voltage (AVDD) | 2.7 V to 5.25 V |
| Digital Supply Voltage (DVDD) | 1.68 V to 5.25 V |
| INL (Integral Non-Linearity) | ±1 LSB (max) |
| DNL (Differential Non-Linearity) | ±1 LSB (max) |
| Điện áp tham chiếu | External (0 to AVDD) |
| Giao diện | SPI/QSPI/MICROWIRE-compatible serial |
| Sequencer | Hardware-resettable, pin-programmable |
| Power Consumption at 125 kSPS | 3 mA (typ) |
| Hộp | 16-TSSOP (FVZ) |
| Nhiệt độ hoạt động | -40 C to +125 C |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Cấu hình chân ISL26315FVZ-T7A
| Chân 1 | SCLK — Serial clock input |
| Chân 2 | DVDD — Digital supply voltage |
| Chân 3 | DOUT — Serial data output |
| Chân 4 | DIN — Serial data input |
| Chân 5 | DGND — Digital ground |
| Chân 6 | AIN0 — Analog input channel 0 |
| Chân 7 | AIN1 — Analog input channel 1 |
| Chân 8 | AIN2 — Analog input channel 2 |
| Chân 9 | AIN3 — Analog input channel 3 |
| Chân 10 | REF — External reference voltage input |
| Chân 11 | AGND — Analog ground |
| Chân 12 | AGND — Analog ground |
| Chân 13 | AVDD — Analog supply voltage |
| Chân 14 | CS — Chip select (active low) |
| Chân 15 | SEQ/RESET — Sequencer enable / hardware reset |
| Chân 16 | CONVST — Conversion start input |
Ứng dụng tiêu biểu
ISL26315FVZ-T7A phù hợp cho 6 Áp dụngs: Industrial Process Control PLCs, Battery-Powered Multi-Sensor Data Loggers, Portable Medical Patient Monitoring, Strain-Gauge Weigh Scales and Load Cells, Automotive Sensor Cluster Digitizers, IoT Edge Sensor Nodes.
Industrial Process Control PLCs
The ISL26315FVZ-T7A's 4 single-ended inputs and hardware sequencer enable direct connection to multiple 4-20 mA current-loop transducers (with shunt resistors) in PLC analog input modules. Its 125 kSPS throughput supports control-loop update rates above 1 kHz when multiplexing 4 channels, while ±1 LSB INL/DNL guarantees calibration accuracy across the industrial -40 C to +85 C range. The 2.7-5.25 V AVDD supply aligns with 24 V->5 V downstream rails common in PLC backplanes, simplifying power architecture.
Được đề xuất
Battery-Powered Multi-Sensor Data Loggers
The ISL26315FVZ-T7A fits portable data loggers that monitor multiple sensors (temperature, pressure, humidity) from a single coin-cell or Li-ion source. Its automatic power-down between conversions drops supply current into the µA range at low sample rates, while 125 kSPS peak throughput supports burst-mode logging when the device wakes. The 4-channel input MUX eliminates the need for an external analog switch, reducing BOM and PCB area in compact wearable designs.
Được đề xuất
Portable Medical Patient Monitoring
Medical patient monitors require low-noise, multi-channel acquisition for ECG, SpO2, temperature, and respiration sensors. The ISL26315FVZ-T7A's SAR architecture provides deterministic latency critical for synchronized ECG sampling, while ±1 LSB linearity ensures accurate SpO2 calculations from photodiode currents. The 16-TSSOP footprint fits compact wearable holter designs, and the wide 2.7-5.25 V supply supports both 3.3 V and 5 V analog front-ends commonly used in medical instrumentation.
Được đề xuất
Strain-Gauge Weigh Scales and Load Cells
Load-cell digitizers require simultaneous sampling of 4 load cells to compute weight and center-of-gravity in platform scales. The ISL26315FVZ-T7A sequences through 4 single-ended channels synchronously, while its hardware sequencer removes MCU overhead for low-power battery operation. Combined with an AD8221 instrumentation amp, it achieves better than 0.1% FS accuracy for commercial weighing scales. The 12-bit resolution fits retail scales where 1 g resolution over 50 kg FS suffices.
Được đề xuất
Automotive Sensor Cluster Digitizers
In automotive body controllers, the ISL26315FVZ-T7A digitizes multiple 0-5 V analog sensors (MAP, MAF, throttle position, oil pressure) over the 12 V battery rail. The 5.25 V AVDD supply tolerates regulated 5 V rails with transient headroom, while the -40 C to +125 C operating range matches automotive underhood requirements. SAR deterministic conversion supports engine management loops that demand fixed-latency sampling across multiple sensor inputs.
Được đề xuất
IoT Edge Sensor Nodes
IoT edge nodes combine multiple MEMS sensors (accelerometer, gyroscope, magnetometer, pressure) behind a single ADC to minimize cost and pin count. The ISL26315FVZ-T7A's 4-channel input multiplexer handles sensor arrays with sample rates above 100 Hz, while its SPI interface integrates with low-cost Cortex-M0 microcontrollers. The TSSOP-16 footprint suits compact coin-cell-powered sensor beacons reporting over BLE or LoRa, with ADC power-down current under 1 µA between transmissions.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ISL26315FVZ-T7A — 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 | ISL26312FVZ-T | ISL26311FBZ | ISL26314FVZ | AD7993BRU-0REEL | ADS7822PG4 |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Analog Devices | Texas Instruments |
| Package | 16-TSSOP (FVZ) | 16-TSSOP - same | 16-TSSOP - same | 16-TSSOP - same | 16-TSSOP - same | 16-TSSOP - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 10/12 bits | 12 bits |
| Sample Rate | 125 kSPS | 125 kSPS | 125 kSPS | 125 kSPS | 188 kSPS | 200 kSPS |
| Input Channels | 4 single-ended | 2 single-ended | 1 channel | 2 SE / 1 DIFF | 4 single-ended | 1 channel |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | I2C | SPI |
| Analog Supply | 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 5.5 V | 2.7 V to 5.25 V |
| INL (max) | ±1 LSB | ±1 LSB | ±1 LSB | ±1 LSB | ±1 LSB | ±1 LSB |
Bảo phân biệt quan trọng
- Hardware-resettable sequencer eliminates firmware overhead (vsADS7822PG4)
- Wide 2.7-5.25 V AVDD with 1.68 V DVDD supports mixed-voltage systems (vsAD7993BRU-0REEL)
- Same-brand die family alternatives simplify drop-in migration (vsISL26312FVZ-T (lower channel count))
Ghi chú thiết kế
Bypass AVDD (pin 13) with a 10 µF tantalum in parallel with a 0.1 µF ceramic placed within 5 mm of the supply pin. DVDD (pin 2) requires a 0.1 µF ceramic only. The internal analog and digital grounds are separated at pins 11/12 (AGND) and pin 5 (DGND); tie them together at a single point under the IC to avoid ground-loop noise injection into the SAR comparator.
Route analog input traces (AIN0-AIN3) as differential pairs with the analog ground, keeping them away from digital SPI lines (SCLK, DOUT, CS, CONVST). The external reference voltage at REF (pin 10) should be driven by a low-impedance buffer (e.g., AD8221 or simple op-amp follower); a high-impedance reference degrades INL during multiplexed acquisition due to dynamic charge injection.
Do not float the SEQ/RESET pin (pin 15) - tie it high for sequencer mode or low for single-channel mode. Floating this pin causes indeterminate channel sequencing. Also, the CONVST input (pin 16) must remain low for at least 8 µs before assertion to allow the internal sample-and-hold to settle; violation degrades linearity and increases THD beyond the ±1 LSB spec.
Thông tin tuân thủ
RoHS compliant per Renesas product page. Not AEC-Q100 qualified; automotive designs should review AEC-Q100 alternatives. Halogen-free status not explicitly stated in retrieved data.
