ISL26708IHZ-T - 8-Bit 1MSPS SAR ADC SOT-23-8 | Renesas
Teilenummer: ISL26708IHZ-T ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $3.2 | $3,20 |
| 10 | $2.88 | $28,80 |
| 100 | $2.55 | $255,00 |
| 500 | $2.18 | $1.090,00 |
| 1.000 | $1.78 | $1.780,00 |
| 3.000 | $1.42 | $4.260,00 |
ISL26708IHZ-T Übersicht
A SAR ADC is a successive-approximation-register analog-to-digital converter that uses a binary-search algorithm and an internal capacitive DAC to convert each analog sample to a digital code in one conversion cycle per bit. Within the broader converter hierarchy, SAR converters sit between flash ADCs (fastest, most power) and sigma-delta ADCs (highest resolution, lowest speed). The SAR topology delivers an excellent speed-vs-power trade-off for industrial instrumentation, motor control, and portable data-acquisition front-ends where mid-bandwidth 8-to-12-bit conversion is required.
Key features of the ISL26708IHZ-T include 1 MSPS guaranteed throughput with no latency, low integral and differential non-linearity across the full supply and temperature range, an SPI-compatible serial interface, a true-differential analog input with high common-mode rejection, and an operating temperature range suited to industrial environments. The fully-differential input simplifies direct connection to bridge sensors, current-shunt amplifiers, and audio line inputs without external instrumentation amplifiers.
The architecture combines a high-impedance track-and-hold front end with a precision charge-redistribution DAC. Each conversion is initiated by the user via the CNVST pin and the result is clocked out on the SDO pin through a standard SPI frame. Power consumption scales linearly with sampling rate, allowing the device to idle at microamp-level standby currents between bursts, which is valuable for battery-powered or duty-cycled applications.
Typical applications include industrial process-control analog front ends, portable instrumentation and battery monitors, optical-module monitoring (SFP/QSFP), temperature and pressure sensor digitizers, motor control feedback, and consumer audio metering. The wide supply range (2.7V to 5.25V) covers both 3.3V and 5V rails, and the differential input tolerates ground-referenced or rail-referenced sensor outputs.
When designing with this device, place the 0.1uF decoupling capacitor as close as possible to the AVDD pin and keep the analog and digital ground returns separated until they join at a single point beneath the IC. The reference decoupling capacitor value and ESR directly affect AC performance; a low-ESR ceramic on REF is recommended for full 1 MSPS operation.
This page synthesizes distributor pricing, drop-in alternatives from Renesas and select competitors, and practical design notes not found in the manufacturer datasheet alone.
Drop-in-Alternativen für ISL26708IHZ-T – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit ISL26708IHZ-T (gleiche Bauform und Footprint) – abweichend in Input Type, Resolution, Architecture, Package, Sampling Rate.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
ISL26710IHZ-T
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ISL26712IHZ-T
✅ Drop-In✓ Auf Lager
$3.96 / Stück
Datenblatt ansehen →ISL26708IHZ-T7A
✅ Drop-In✓ Auf Lager
$0.78 / Stück
Datenblatt ansehen →ISL26708IHZ-T Grenzwerte & elektrische Eigenschaften
| Auflösung | 8 bit |
| Abtastrate | 1 MSPS |
| Converter Type | SAR (Successive Approximation Register) |
| Architecture | Fully-Differential Input |
| Analog Supply Voltage | 2.7 V to 5.25 V |
| Reference Voltage Input Range | 0 V to VDD |
| Input Common-Mode Range | Rail-to-rail |
| Number of Channels | 1 |
| Schnittstelle | SPI-compatible serial |
| Betriebstemperaturbereich | -40 C to +85 C (industrial) |
| Gehäuse | SOT-23-8 |
| Montageart | Surface Mount |
| RoHS-Status | Compliant |
| Input Type | True differential, high impedance |
| Conversion Latency | 0 (no pipeline delay) |
ISL26708IHZ-T Pin-Konfiguration
| Pin 1 | AVDD — Analog supply voltage (2.7V to 5.25V) |
| Pin 2 | REF — Reference voltage input (0V to AVDD) |
| Pin 3 | AGND — Analog ground |
| Pin 4 | IN+ — Positive differential analog input |
| Pin 5 | IN- — Negative differential analog input |
| Pin 6 | CNVST — Conversion start (active low) |
| Pin 7 | SDO — Serial data output (SPI) |
| Pin 8 | SCLK — Serial clock input |
Typische Anwendungen
ISL26708IHZ-T ist geeignet für 7 Anwendungs: Industrial Process Control Analog Front End, Portable Instrumentation and Data Acquisition, Optical Module Monitoring (SFP/QSFP), Motor Control Current and Voltage Feedback, Temperature and Pressure Sensor Digitizer, Consumer Audio Level Metering, Battery Cell Voltage Monitoring.
Industrial Process Control Analog Front End
The ISL26708IHZ-T fits industrial process-control analog front ends because of its 1 MSPS throughput, true-differential rail-to-rail input, and -40 C to +85 C industrial temperature range. The fully-differential input connects directly to 4-20 mA current-loop receivers, RTD bridges, and thermocouple amplifiers without external instrumentation stages, while the SPI-compatible interface simplifies isolation through digital isolators. The 8-bit resolution is sufficient for setpoint monitoring, threshold detection, and PID feedback in PLC and DCS cards where higher-precision monitoring is reserved for separate calibration channels.
Empfohlen
Portable Instrumentation and Data Acquisition
The ISL26708IHZ-T is well suited to battery-powered portable data-acquisition modules because the SAR topology scales power linearly with sample rate and the device idles at low standby current between bursts. Operating from a single 2.7V-5.25V supply, the ADC runs directly from a Li-ion cell without additional regulation. The 1 MSPS speed allows 8-bit digitizing of audio-band and mechanical-vibration signals, while the SPI interface connects to low-power MCUs such as RL78 or RX100 in handheld multimeter, vibration analyzer, and field-recorder designs.
Empfohlen
Optical Module Monitoring (SFP/QSFP)
In SFP, QSFP, and SFP+ optical transceivers, the ISL26708IHZ-T digitizes TX bias current, TX optical power, received signal strength indicator (RSSI), temperature, and supply rail voltages with a single shared SPI bus. The SOT-23-8 footprint fits the small host-board area, and the rail-to-rail differential input accepts the 0-2.5V analog signals from monitor photodiodes without scaling. The 8-bit resolution is more than adequate because monitor channels are typically mapped to 0.5 C or 0.1 mA resolution steps defined by the SFF-8472 specification.
Empfohlen
Motor Control Current and Voltage Feedback
Brushless DC and stepper motor control loops use the ISL26708IHZ-T to digitize phase-current shunt-amplifier outputs and DC-bus voltage feedback. The true-differential input rejects switching noise from the half-bridge, and the 1 MSPS throughput captures the PWM-synchronized current waveform with sub-microsecond resolution. The 8-bit resolution is appropriate for torque-ripple profiling, while a second ISL26712IHZ-T can be reserved for precision speed-control feedback where 12-bit accuracy is needed. The SOT-23-8 package keeps the analog island small on the motor-control PCB.
Empfohlen
Temperature and Pressure Sensor Digitizer
The ISL26708IHZ-T digitizes analog outputs of bridge-type pressure sensors, MEMS microphones, and amplified thermocouples. The high-impedance differential input connects directly to the bridge without loading the sensor, while the rail-to-rail input accepts unipolar 0-5V outputs from instrumentation amplifiers. With one sample per millisecond, the converter provides 1 kSPS per channel which exceeds the update rate of most industrial temperature and pressure transmitters. The -40 C to +85 C industrial range matches outdoor HVAC and refrigeration sensor nodes.
Empfohlen
Consumer Audio Level Metering
AV receivers, mixers, and powered speakers use the ISL26708IHZ-T for VU/peak meter digitizing because the 1 MSPS throughput captures audio-band energy without aliasing. The differential input allows direct AC coupling of line-level signals, while the 2.7V-5.25V supply range supports 3.3V digital rails. The 8-bit resolution is acceptable for logarithmic level metering where the display driver further compresses the codes. The compact SOT-23-8 footprint simplifies routing on dense front-panel PCBs with many analog inputs.
Empfohlen
Battery Cell Voltage Monitoring
Battery-management systems in UPS, e-bike, and portable medical carts use the ISL26708IHZ-T to digitize individual cell voltages in stacks of 2-12 Li-ion cells. The differential input tolerates the common-mode step when scanning the top of the stack versus the bottom, eliminating level-shift circuitry. The wide 2.7V-5.25V supply allows direct operation from the pack, while the 1 MSPS throughput multiplexes multiple cells through an external analog switch. The 8-bit resolution corresponds to 20 mV LSB at 5V full-scale, matching the cell-balancing threshold resolution.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ISL26708IHZ-T – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | ISL26710IHZ-T | ISL26712IHZ-T | ISL26708IHZ-T7A | HI5812JIBZ-T |
|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | SOT-23-8 | SOT-23-8 (same) | SOT-23-8 (same) | SOT-23-8 (same) | SOIC-8 (different) |
| Resolution | 8 bit | 10 bit | 12 bit | 8 bit (same) | 12 bit |
| Sampling Rate | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS |
| Converter Type | SAR | SAR | SAR | SAR | SAR |
| Input Type | True differential | True differential | True differential | True differential | Single-ended |
| 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 |
| Reel Size / Packaging | Tape & Reel, 3000 | Tape & Reel, 3000 | Tape & Reel, 3000 | Tape & Reel, 500 (7-inch reel) | Tape & Reel |
Wichtigste Unterscheidungsmerkmale
- Smallest-footprint 8-bit differential SAR ADC at 1 MSPS (vs. ISL26710IHZ-T)
- Lower cost than 10-bit and 12-bit family siblings (vs. ISL26710IHZ-T / ISL26712IHZ-T)
- Higher resolution than typical 8-bit pipelined alternatives (vs. AD9051BRSRL / lower-resolution 8-bit ADCs)
Designhinweise
Place a 0.1uF ceramic decoupling capacitor as close as possible to the AVDD pin (pin 1) using a short, wide trace to the analog ground pin (pin 3). Add a bulk 1uF to 10uF tantalum or ceramic bypass on the same rail near the IC. Avoid routing digital switching currents through the analog ground plane; instead, use a star-ground topology that ties the AGND pin directly to a low-impedance ground pour.
Route the SPI bus signals (SCLK, SDO, CNVST) as short as possible and keep them on the opposite side of the PCB from the analog input traces to minimize digital-to-analog crosstalk. Place a ground guard trace between the IN+/IN- pair and any digital signal traces. Use a solid analog ground pour on the layer directly beneath the ADC to provide a low-impedance return path and to shield the input traces from board-level EMI.
The reference voltage REF (pin 2) is the dominant factor in ADC linearity, so decouple it with a low-ESR ceramic capacitor (typically 10uF in parallel with 0.1uF) placed within 2 mm of the pin. The reference input source impedance should be below 10 ohms at 1 MSPS to avoid gain error. If the reference is shared with another ADC, add a buffer amplifier to prevent code-dependent reference current from distorting the conversion result.
Do not exceed the absolute maximum analog input voltage (AVDD + 0.3V) on IN+ or IN-; if the sensor can produce transients above AVDD, add external clamping diodes to AVDD. Confirm that the SPI host MCU's VDD matches AVDD (or use level-shifters) to avoid permanent damage to the SDO pin. Finally, ensure that CNVST returns high before the next conversion is triggered, or the internal state machine will miss the start edge and return an old sample.
Compliance-Informationen
RoHS compliant per Renesas product page. Not AEC-Q100 qualified - consult Renesas automotive catalog for qualified variants. Lead-free reflow profile per JEDEC J-STD-020.
