ISL26312FVZ-T7A - 12-bit 125kSPS Dual-Channel SAR ADC | Renesas
MPN: ISL26312FVZ-T7A ✓ Hoạt độngISL26312FVZ-T7A Tóm tắt
A SAR ADC is a type of data converter that compares the sampled input voltage against a precision DAC one bit at a time over successive clock cycles, achieving deterministic latency and excellent DC accuracy at moderate sampling rates. SAR converters sit in the broader hierarchy: data converter -> ADC -> SAR ADC -> precision acquisition IC -> mixed-signal semiconductor. They are preferred over delta-sigma or pipeline ADCs whenever multiplexed multi-channel inputs, low power, simple SPI/QSPI/MICROWIRE digital interfaces, and excellent AC performance are needed in industrial instrumentation.
Key features of the ISL26312FVZ-T7A include 12-bit resolution, 125 kSPS throughput, two differential input channels (selectable from up to four single-ended or two differential inputs through an internal analog multiplexer), an SPI/QSPI/MICROWIRE-compatible serial interface, and a wide 2.7 V to 5.25 V analog supply range that supports single-supply 3.3 V or 5 V rails.
Technical depth comes from the proprietary input multiplexer with an integrated input buffer amplifier, which reduces input drive requirements and minimizes channel-to-channel crosstalk. The device draws microamp-level supply current at lower sample rates, and offers a hardware power-down pin for battery-sensitive applications. Linearity is maintained across the industrial -40 C to +125 C temperature range, supported by a built-in track/hold and a robust internal reference option.
Typical applications include industrial process control loops, multi-channel data-acquisition front-ends, isolated sensor signal chains, PLC analog input modules, and battery-powered instrument clusters where the combination of low power draw and clean 12-bit DC performance yields high measurement integrity.
When designing with this part, place a 10 nF ceramic decoupling capacitor directly at the AVDD pin and a 1 uF bypass at DVDD to keep the SAR comparator noise floor low. The REFIN/REFOUT pin accepts either an external reference or uses the internal 2.5 V reference - drive REFOUT with a low-ESR 10 uF ceramic for best AC performance.
This page synthesizes distributor pricing, drop-in alternatives within the ISL26310/11/12/13/14/15/19 family, and practical design notes not collected in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho ISL26312FVZ-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 ISL26312FVZ-T7A (cùng hình factor và footprint) — khác nhau ở Package, Input Configuration, Resolution, ADC Architecture, Digital Interface.
ISL26310FVZ-T7A
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISL26313FVZ-T7A
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISL26314FVZ-T7A
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISL26311FVZ-T7A
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISL26315FVZ-T7A
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ISL26319FVZ-T7A
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISL26312FVZ-T7A Tỷ lệ tối đa & tính chất điện
| Part Number | ISL26312FVZ-T7A |
| Độ phân giải | 12 bit |
| Tỷ lệ lấy mẫu | 125 kSPS |
| Number of Inputs | 2 differential (MUX-up to 4 single-ended / 2 differential) |
| Converter Architecture | SAR (Successive Approximation Register) |
| Input Configuration | Single-ended and differential inputs |
| Analog Supply Voltage | 2.7 V to 5.25 V |
| Digital Supply Voltage | 2.7 V to 5.25 V |
| DNL | 0.7 LSB (typ) |
| Điện áp tham chiếu | Internal 2.5 V or external |
| Digital Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Nhiệt độ hoạt động | -40 C to +125 C |
| Hộp | 16-pin TSSOP |
| Kiểu lắp đặt | Surface Mount |
| Shipping Carrier | Tape & Reel, 7-inch (T7A suffix) |
| Trạng thái RoHS | Compliant |
| HSUSA Code | 8542390000 |
Cấu hình chân ISL26312FVZ-T7A
| Chân 1 | AVDD — Analog supply voltage (2.7 V to 5.25 V) |
| Chân 2 | REFIO — Reference input/output (internal 2.5 V or external) |
| Chân 3 | IN0+ — Differential positive input channel 0 |
| Chân 4 | IN0- — Differential negative input channel 0 |
| Chân 5 | IN1+ — Differential positive input channel 1 |
| Chân 6 | IN1- — Differential negative input channel 1 |
| Chân 7 | GND — Analog ground |
| Chân 8 | /CS — Active-low chip select (SPI) |
| Chân 9 | SCLK — Serial clock input (SPI) |
| Chân 10 | DOUT/DRDY — Serial data output / data ready |
| Chân 11 | DIN — Serial data input (SPI) |
| Chân 12 | /PD — Active-low power-down input |
| Chân 13 | DVDD — Digital supply voltage |
| Chân 14 | DGND — Digital ground |
| Chân 15 | /RESET — Active-low reset input |
| Chân 16 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
ISL26312FVZ-T7A phù hợp cho 6 Áp dụngs: Industrial Process Control Data Acquisition, Multi-Channel Sensor Signal Chain, Programmable Logic Controller (PLC) Analog Input Modules, Battery-Powered Field Instrumentation, Medical Patient Monitoring Sensors, Factory Automation Encoder and Vibration Monitoring.
Industrial Process Control Data Acquisition
The ISL26312FVZ-T7A suits multi-loop industrial process control boards where 2 differential channels digitize 4-20 mA sensor outputs after precision current-sense amplification. Its 125 kSPS throughput oversamples the slowly varying process variables (typically <100 Hz of interest) by a factor of 1000 or more, supporting digital averaging to effective >14-bit resolution in firmware. The internal input buffer amplifier minimizes cross-talk between adjacent channels, while the 2.7 V to 5.25 V supply range lets the part sit on a 24-V-rail-derived isolated 5 V supply without an extra LDO. Using a 10 nF AVDD bypass ceramic and a 1 uF REFOUT capacitor, the SAR noise floor is held low enough to resolve 12-bit codes at full speed.
Được đề xuất
Multi-Channel Sensor Signal Chain
For bridge-type pressure, strain-gauge, and thermocouple front-ends, the ISL26312FVZ-T7A digitizes differential sensor outputs directly without an external instrumentation amplifier in many cases. The proprietary input buffer reduces drive requirements to <1 kohm source impedance, letting the SAR ADC settle to 12-bit accuracy within the acquisition window. Multi-channel thermistor or RTD boards benefit from the wide -40 C to +125 C operating range matching industrial environmental requirements. The internal 2.5 V reference is ratiometric to sensor excitation, while the low power consumption (~1.5 mA at 125 kSPS) supports handheld or battery-backed measurement systems.
Được đề xuất
Programmable Logic Controller (PLC) Analog Input Modules
PLC analog input modules require a multi-channel 12-bit ADC with deterministic latency and robust isolation. The ISL26312FVZ-T7A provides two differential channels per chip, allowing PLC designers to scale channel count by paralleling the part on a common SPI bus tied to the MCU. The SAR architecture's single-cycle conversion gives fixed, predictable latency across all inputs - critical for closed-loop PLC control. The wide 2.7 V to 5.25 V supply lets the chip share a 5 V or 3.3 V backplane, and the 16-pin TSSOP footprint supports 24-ch density on a typical 100x100 mm industrial module.
Được đề xuất
Battery-Powered Field Instrumentation
Portable handheld instruments, wireless sensor nodes, and remote monitoring devices benefit from the ISL26312FVZ-T7A's low power draw and hardware power-down pin. The /PD pin can reduce supply current to microamp-level standby between scans, extending battery life significantly when duty-cycling measurements every few seconds. The wide supply voltage lets the part run directly from a lithium 3.6 V cell after a simple boost converter, eliminating the need for an additional LDO. Its 125 kSPS throughput can be dialed down via the SCLK rate to consume even less current at lower scan rates, making it a flexible choice for power-budgeted designs.
Được đề xuất
Medical Patient Monitoring Sensors
Low-power multi-channel patient-monitoring peripherals (e.g. temperature, SpO2 front-ends, respiration) benefit from the ISL26312FVZ-T7A's combination of 12-bit resolution, low power consumption, and ability to operate over the industrial -40 C to +125 C range. The two differential channels can digitize a temperature sensor pair (thermistor bridge) and a SpO2 photodiode channel simultaneously, while the SPI interface lets the host microcontroller enter sleep between conversions. The small 16-pin TSSOP package supports wearable form factors, and the SAR architecture's deterministic conversion latency is critical when one ADC channel is shared between timing-critical and best-effort measurements.
Được đề xuất
Factory Automation Encoder and Vibration Monitoring
Predictive-maintenance vibration analyzers and factory-automation encoder readers need a SAR ADC that captures fast transients without aliasing while remaining power-efficient. The ISL26312FVZ-T7A's 125 kSPS is comfortable for vibration bands up to 50 kHz at 2.5x oversampling, allowing capture of bearing-fault signatures. The SPI/QSPI/MICROWIRE-compatible serial interface fits direct connection to DSPs and industrial motor-control MCUs. The differential input capability rejects common-mode noise from long motor-cable runs, and the wide temperature grade suits encoder boxes mounted near drive cabinets.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ISL26312FVZ-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 | ISL26310FVZ-T7A | ISL26313FVZ-T7A | ISL26314FVZ-T7A | ISL26311FVZ-T7A |
|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 16-TSSOP | 16-TSSOP - same | 16-TSSOP - same | 16-TSSOP - same | 16-TSSOP - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 125 kSPS | 125 kSPS | 125 kSPS | 125 kSPS | 125 kSPS |
| Number of Inputs | 2 differential / 4 SE | 1 differential / 2 SE | 4 differential / 8 SE | 4 differential / 8 SE | 1 differential / 2 SE |
| 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 |
| Digital Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
Bảo phân biệt quan trọng
- 2 differential / 4 SE multiplexer inputs in a 16-pin TSSOP footprint (vsISL26310FVZ-T7A)
- Lower channel overhead than ISL26313 for cost-sensitive designs (vsISL26313FVZ-T7A)
- Fully pin-compatible family scalability from 1 to 8 channels (vsISL26310/11/13/14/15/19 family)
Ghi chú thiết kế
Decouple the AVDD pin with a 10 nF X7R ceramic placed within 3 mm of the package pin, and add a 1 uF bulk capacitor at the PCB power-entry node. DVDD should be tied to the same rail or a separate 1.8 V logic supply, decoupled with a 100 nF plus 4.7 uF pair. The internal 2.5 V reference is bypassed on the REFOUT/REFIO pin with a 1 uF to 10 uF low-ESR ceramic, sized to damp the SAR comparator's transient charging pulses at 125 kSPS.
Do not leave the IN- pins floating when running single-ended measurements - tie them directly to analog ground to avoid channel-to-channel leakage paths that manifest as ~3 LSB offset drift with temperature. Pull /CS high between transactions to avoid spurious noise injection. The /PD pin must be brought high within 100 us of power-on to allow the internal bias network to settle before issuing the first conversion command.
Route the analog input traces as differential pairs with matched 50 ohm impedance when possible, keeping them short and away from switching regulator or digital clock traces. Pour an analog ground plane underneath the ADC and stitch it to the digital ground at a single point near the power-entry node. Avoid running SCLK or DOUT parallel to any analog input for more than a few millimeters to prevent digital-coupling artifacts at the 12-bit quantize level.
Thông tin tuân thủ
RoHS compliant per Renesas product page. Not AEC-Q100 qualified (industrial grade, not automotive). HSUSA export code 8542390000 per Jotrin datasheet listing.