ISL26712IHZ-T - 12-bit 1MSPS SAR ADC | Renesas | SOT-23-8
料号： ISL26712IHZ-T ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.28 | $6.28 |
| 10 | $5.65 | $56.50 |
| 100 | $5.02 | $502.00 |
| 500 | $4.46 | $2,230.00 |
| 1,000 | $3.96 | $3,960.00 |
ISL26712IHZ-T 概述
A successive-approximation register (SAR) ADC is a converter architecture that performs a binary search across an internal precision DAC during each conversion cycle. Within the converter hierarchy, SAR ADCs sit between high-speed flash converters and high-resolution sigma-delta ADCs, providing an optimal mix of speed (up to multi-MSPS) and resolution (8-18 bits) for general-purpose data acquisition. The ISL26712 belongs to Renesas's precision-SAR family designed for industrial instrumentation, process control, and battery-powered sensing.
Key features include 12-bit resolution with no missing codes, throughput up to 1MSPS, fully differential analog inputs with high input impedance to minimize leakage-induced errors, a wide 2.7V-5.25V analog supply range, and an SPI/QSPI/MICROWIRE-compatible serial interface. The internal reference can be overdriven by an external VREF for absolute-accuracy applications. Robust ESD ratings (HBM 4kV, CDM 1.5kV) and a -40C to +85C industrial operating range support demanding field-deployed instrumentation.
The ISL26712 uses a charge-redistribution DAC with input sampling on internal capacitors, achieving excellent linearity across temperature and supply variations. The robust sampling front-end tolerates input signals up to the supply rails without linearity degradation, and the simple CS/SHDN-controlled conversion start simplifies MCU/DSP handshaking without complex sequencer overhead.
Typical applications include industrial process control loops, weight scales and load-cell digitizers, portable instrumentation, motor-control current sensing, temperature-measurement systems using thermocouples or RTDs, and data acquisition front-ends. The 1MSPS throughput also supports digital oscilloscope front-ends and feedback-loop digitizers inside switching power converters.
When designing with this device, place the 0.1uF VREF bypass capacitor as close as possible to the VREF pin and provide a clean ground return separate from noisy digital returns to preserve AC performance. Series resistance between the input source and the +IN/-IN pins should be kept below 50 ohm to avoid conversion-time-induced gain error.
This page synthesizes distributor pricing, drop-in alternatives from the same Renesas/Intersil SAR family, and practical layout notes not consolidated in the manufacturer datasheet.
直接替换替代料： ISL26712IHZ-T ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ISL26712IHZ-T （相同外形与封装尺寸） ——差异在于 Input Type, RoHS Status, Resolution, Architecture, Number of Input Channels.
快速对比工具——选择替代料号进行并排对比：
ISL26710IHZ-T
✅ 直接替换📋 参考替代料（不在目录中）
ISL26708IHZ-T
✅ 直接替换✓ 有现货
$1.42 / 个
查看数据手册 →ISL26712IHZ-T 最大额定值与电气特性
| 分辨率 | 12 bits |
| 采样率 | 1 MSPS |
| Architecture | SAR (Successive Approximation Register) |
| Number of Input Channels | 1 (true differential) |
| Analog Supply Voltage | 2.7 V to 5.25 V |
| Digital Supply Voltage | 2.7 V to VCC |
| Input Type | Differential (high impedance) |
| Integral Nonlinearity (INL) | ±1 LSB (max) |
| Differential Nonlinearity (DNL) | ±0.5 LSB (max) |
| Signal-to-Noise Ratio (SNR) | 73 dB (typ) |
| Effective Number of Bits (ENOB) | 11.8 bits (typ) |
| Reference Input | External or internal (overdriven) |
| Digital Interface | SPI / QSPI / MICROWIRE-compatible |
| Power Consumption | 12.5 mW at 1 MSPS, 5V |
| 工作温度 | -40C to +85C (industrial) |
| 封装 | SOT-23-8 |
| ESD Rating (HBM) | 4 kV |
| ESD Rating (CDM) | 1.5 kV |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
ISL26712IHZ-T 引脚配置
| 引脚 1 | VREF — Reference input (or internal reference out) |
| 引脚 2 | +IN — Non-inverting differential analog input |
| 引脚 3 | -IN — Inverting differential analog input (connect to ground or remote sense) |
| 引脚 4 | GND — Ground |
| 引脚 5 | CS/SHDN — Chip select / shutdown (active low) |
| 引脚 6 | DOUT — Serial data output (SPI) |
| 引脚 7 | DCLOCK — Serial data clock input |
| 引脚 8 | VCC — Analog and digital supply (2.7V to 5.25V) |
典型应用
ISL26712IHZ-T 适用于 7 应用s: Industrial Process Control Loop Digitizer, Weigh Scale / Load Cell Digitizer, Portable Battery-Powered Instrumentation, Motor Control Current Sensing, RTD/Thermocouple Temperature Measurement, Digital Oscilloscope Front-End, Switching Power Supply Feedback Digitizer.
Industrial Process Control Loop Digitizer
The ISL26712IHZ-T's 12-bit 1MSPS throughput and ±1 LSB INL make it ideal for digitizing 4-20mA current-loop sense voltages inside PLC analog input modules and distributed control systems. The fully-differential high-impedance input tolerates common-mode voltages up to the supply rails, eliminating front-end instrumentation amplifiers in many loops. Power dissipation at 12.5 mW allows dense multi-channel PCBs without thermal concerns.
推荐
Weigh Scale / Load Cell Digitizer
The ISL26712IHZ-T delivers 73 dB SNR and 11.8 effective bits, sufficient for sub-gram resolution in commercial weigh scales using 2mV/V load cells. Differential inputs reject thermocouple and supply noise, supporting ungrounded bridge excitation. The SOT-23-8 footprint supports 25 mm x 25 mm scale electronics without resorting to oversize IC packages. Power consumption scales with sample rate for battery-powered portable scales.
推荐
Portable Battery-Powered Instrumentation
The ISL26712IHZ-T operates from a single 2.7V to 5.25V supply consuming only 12.5 mW at full 1MSPS throughput, suiting handheld oscilloscope, multimeter, and field data-logger designs. The CS/SHDN pin enables power-cycling to reduce idle current to microampere levels between conversion bursts, extending battery life on lithium coin cells. Industrial -40C to +85C operating range supports outdoor and cold-storage deployments.
推荐
Motor Control Current Sensing
The ISL26712IHZ-T samples motor phase currents at 1MSPS within FOC and trapezoidal commutation loops, leveraging true-differential inputs to reject ground bounce across high-side/low-side shunt resistors. Single-conversion CS-controlled latency simplifies synchronizing ADC sampling with PWM edges for sub-microsecond control latency. SOT-23-8 footprint fits inside compact ESC modules for drones and e-bikes.
RTD/Thermocouple Temperature Measurement
The ISL26712IHZ-T digitizes platinum RTD and K-type thermocouple signals with 12-bit resolution, providing ~0.1C accuracy after linearization. Differential inputs reject common-mode pickup from heater-resistance noise, and the wide 2.7V-5.25V supply range supports 3.3V and 5V signal-isolator front-ends. The SOT-23-8 footprint suits 4-wire DIN-style sensor modules for industrial furnace and HVAC monitoring.
Digital Oscilloscope Front-End
The ISL26712IHZ-T's 1MSPS sampling meets the bandwidth requirements of USB-pc oscilloscope and lab diagnostics into the audio band (~250kHz useful bandwidth per Nyquist). Using only 12.5 mW it does not heat the front-end PCB, eliminating thermocouple-induced drift at the analog input stage. The CS/SHDN line gives the host MCU deterministic capture-window control without DMA arbitration overhead.
Switching Power Supply Feedback Digitizer
The ISL26712IHZ-T digitizes output voltage and current on each switching cycle, enabling cycle-by-cycle digital control of PFC and LLC converters without analog error amplifiers. Differential inputs reject high-dV/dt transients common in switch-mode designs. The 1MSPS sampling rate is more than adequate for 100kHz-class switching converters, leaving firmware headroom for decimation averaging.
推荐
推荐产品汇总
工程参考数据： ISL26712IHZ-T ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ISL26710IHZ-T | ISL26708IHZ-T |
|---|---|---|---|
| Package | SOT-23-8 | SOT-23-8 (same) | SOT-23-8 (same) |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Resolution | 12 bits | 10 bits (-2 bits) | 8 bits (-4 bits) |
| Sampling Rate | 1 MSPS | 1 MSPS | 1 MSPS |
| Input Type | True differential | True differential | True differential |
| Analog Supply | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V |
| INL (max) | ±1 LSB | ±0.5 LSB (10-bit scale) | ±0.25 LSB (8-bit scale) |
| Power at 1 MSPS | 12.5 mW | 12.5 mW | 12.5 mW |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE |
关键差异点
- Highest-resolution SOT-23-8 1MSPS SAR from Renesas family （对比 ISL26710IHZ-T)
- Wide supply range 2.7V-5.25V enables single-rail portable designs （对比 ADS7250 (TI))
- True-differential input with common-mode range to rails （对比 ADS8342 (TI, 16-bit, SOT-23))
设计说明
Place the 0.1uF VREF bypass capacitor within 3 mm of the VREF pin (pin 1) and tie the ground side directly to the analog ground return without sharing vias with digital currents. Series resistance from the input source to +IN/-IN must stay below 50 ohm to avoid conversion-time gain error; values above 100 ohm introduce measurable 0.3% full-scale error at 1MSPS throughput. Keep digital traces (DOUT, DCLOCK, CS/SHDN) physically separated from the +IN/-IN traces or guarded with a ground island to preserve SNR.
Decouple the VCC pin with a 10uF tantalum (or 4.7uF ceramic) bulk capacitor in parallel with a 0.1uF ceramic placed within 5 mm of pin 8. The CS/SHDN pin can be tied to logic high to disable the device, dropping quiescent current to under 10 uA - useful for battery-powered designs that sample on a duty cycle. Pull CS/SHDN high through a 10k ohm resistor so that an open connection returns to safe shutdown rather than continuous conversion.
Drive the +IN and -IN pins with matched source impedances; asymmetry above 5 ohm between the two paths introduces input-referred offset and degrades CMRR below the datasheet 80 dB rating. The CS/SHDN falling edge marks the start of acquisition - hold DCLOCK idle for at least 200 ns after CS falling to meet the datasheet timing. When clocking in burst conversions, ensure DCLOCK idle low during CS high intervals to maintain the no-transaction state.
Do not exceed the absolute-maximum VCC of 6.0V or apply analog inputs outside the 0V-to-VCC range - doing so triggers input ESD clamp conduction and may permanently degrade INL. The internal reference is bypassed internally; if using external reference, drive VREF with a low-noise source such as the ADR01 and bypass with 10uF. Avoid using one DSP port pin for both CS and another peripheral without tri-state buffering, since glitches during CS transitions can cause false starts.
合规信息
RoHS compliant per Renesas product page. AEC-Q100 not qualified - this is an industrial-grade part. Lead-free matte-tin finish, MSL1 reflow compatible to 260C per IPC J-STD-020.
