ISL26708IRTZ-T7A - 8-Bit 1MSPS SAR ADC, 8-TDFN | Renesas
N.º de pieza: ISL26708IRTZ-T7A ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $5.2 | $5,20 |
| 10 | $4.65 | $46,50 |
| 100 | $4.07 | $407,00 |
| 500 | $3.55 | $1.775,00 |
| 1.000 | $3.1 | $3.100,00 |
ISL26708IRTZ-T7A Descripción general
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 an analog input to a digital code in one conversion cycle per bit. SAR ADCs combine high throughput (often hundreds of kSPS to multi-MSPS) with deterministic latency and excellent DC accuracy - placing them in the broader taxonomy: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor.
Key features include 1 MSPS throughput, ±1 LSB INL/DNL (typical), a SPI-/QSPI-/MICROWIRE-compatible serial interface, low 8 mW power dissipation at 1 MSPS with 3 V supply, and a 2.5 V reference input accepting external references for system-level gain trim. The wide supply range allows direct interfacing to 3.3 V and 5 V microcontrollers or DSPs without level translators. An exposed thermal pad (EP) reduces junction-to-ambient thermal resistance, which is important for sustained 1 MSPS operation at elevated ambient temperatures.
The converter is built on a BiCMOS process that pairs a precision analog front-end with a small-footprint serial host interface, delivering low total harmonic distortion at full Nyquist input while keeping quiescent supply current modest in partial-power-down and full-power-down modes.
Typical applications include industrial process control loop readouts, multi-channel data-acquisition front ends, optical-module monitor photodiodes, and precision sensor conditioning where deterministic latency and small PCB area matter. An end-of-conversion (EOC) flag and dedicated CNVST rising-edge conversion control simplify DMA hand-off and oversampling schemes in embedded designs.
When designing with the ISL26708, allocate the analog and digital ground planes as a single star-ground tied under the EP, and bypass AVDD and DVDD independently with 10 uF bulk plus 100 nF high-frequency ceramic capacitors within 5 mm of the pins.
This page bundles distributor pricing, drop-in alternates, application examples, and design notes curated for engineers evaluating SAR ADCs in industrial, sensor, and instrumentation designs.
Alternativas directas para ISL26708IRTZ-T7A — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ISL26708IRTZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL26708IRTZ-T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL26710IRTZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL26712IRTZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL26708IRTZ-T7A Valores máximos y características eléctricas
| Manufacturer | Renesas Electronics |
| Part Number | ISL26708IRTZ-T7A |
| Converter Type | SAR ADC (Successive Approximation Register) |
| Resolución | 8 bit |
| Frecuencia de muestreo | 1 MSPS |
| Number of Input Channels | 1 |
| Input Type | Single-ended (pseudo-differential) |
| Analog Supply Voltage | 2.7 V to 5.25 V |
| Reference Input | External, up to AVDD |
| INL (typical) | ±1 LSB (max) |
| DNL (typical) | ±0.7 LSB |
| Power Dissipation (typ. at 1 MSPS) | 8 mW (3 V); 18 mW (5 V) |
| Power-Down Current | 1 uA typical |
| Serial Interface | SPI / QSPI / MICROWIRE-compatible |
| Encapsulado | 8-TDFN-EP (3x3 mm) with exposed thermal pad |
| Tipo de montaje | Surface Mount |
| Temperatura de funcionamiento | -40 C to +85 C (industrial) |
| Estado RoHS | Compliant |
| Nivel MSL | 1 |
| Lead-Free / Halogen-Free | Yes / Yes (per Renesas / Intersil datasheet) |
Configuración de pines de ISL26708IRTZ-T7A
| Pin 1 | AVDD — Analog supply voltage input, 2.7 V to 5.25 V |
| Pin 2 | REF — External reference input; bypass to AGND with 1 uF + 100 nF |
| Pin 3 | IN+ — Analog input (single-ended, pseudo-differential) |
| Pin 4 | AGND — Analog ground |
| Pin 5 | CNVST — Conversion start (rising edge triggers SAR conversion) |
| Pin 6 | EOC — End of conversion flag (active low) |
| Pin 7 | SCLK — Serial clock input |
| Pin 8 | SDOUT — Serial data output (SPI / QSPI / MICROWIRE-compatible) |
| Pin 9 | EP — Exposed thermal pad - solder to analog ground copper pour for thermal relief |
Aplicaciones típicas
ISL26708IRTZ-T7A es adecuado para 6 aplicacións: Industrial Process-Control Loop Readout, Optical Module Photodiode Monitor, Multi-Channel Data Acquisition Front-End, Precision Sensor Conditioning - Bridge / Thermocouple Readout, Battery-Operated Handheld Test Equipment, Industrial Digital Setpoint / Threshold Detection.
Industrial Process-Control Loop Readout
The ISL26708IRTZ-T7A's 1 MSPS throughput and 8-bit SAR core suit high-speed industrial loop readouts from 4-20 mA current loops and 0-10 V process signals. The 2.7 V to 5.25 V analog supply is fully compatible with 3.3 V PLC backplanes and 24 V-DC-isolated rails post-regulation, and the integrated track-and-hold removes the need for an external buffer. The 8-TDFN-EP 3 x 3 mm package keeps PCB area small for dense channel-count PLCs. With SPI / QSPI / MICROWIRE-compatible serial host, the device mates directly with industrial MCUs such as Renesas RX100 or TI MSP430 without glue logic. Power-down mode (1 uA typical) lets unused channels idle between scans, suiting multiplexed 8-to-1 loop monitors.
Recomendado
Optical Module Photodiode Monitor
Inside optical transceiver modules (SFP, QSFP, XFP), the ISL26708IRTZ-T7A digitises monitor photodiodes for laser bias and received-power feedback. The 1 MSPS sample rate exceeds typical TIA bandwidth in 10 Gbps modules, giving margin for 4x oversampling to remove noise. The 8-bit resolution is sufficient for APC loops and Tx-power calibration, where 8-bit granularity on log-monitor currents keeps an SFP within MSA eye-mask spec. The exposed thermal pad on the 8-TDFN-EP package couples heat to the module's chassis ground plane. Combined with the 8 mW typical power dissipation at 3 V, the part fits tight thermals inside an SFP cage. SPI bus is shared with the module's MCU, minimising pin count.
Recomendado
Multi-Channel Data Acquisition Front-End
Pair the ISL26708IRTZ-T7A with an analog multiplexer to build a compact, fast multi-channel DAQ subsystem. The deterministic SAR latency and 1 MSPS throughput allow round-robin scanning of up to 16 multiplexer inputs in 16 us. The 2.5 V external reference input takes a precision REF5025 or REF3125 for low-noise ADC ground-reference scaling. The exposed thermal pad and 3.3 V or 5 V supply operation simplify integration with industrial-grade DSPs and MCUs. The 1 uA power-down current between sweeps lets a portable DAQ run on battery, and the industrial -40 C to +85 C rating covers outdoor and instrumentation-cabinet deployments.
Recomendado
Precision Sensor Conditioning - Bridge / Thermocouple Readout
The ISL26708IRTZ-T7A's low noise and 1 MSPS conversion rate make it a good fit for sensor readout in bridge sensors (load cells, strain gauges) and K-type thermocouple pipelines that have already been amplified and cold-junction-compensated. Designers can pick 8-bit resolution when the signal swing has been pre-gained into a 2.5 V reference window, keeping system cost low. The serial-host EOC flag supports DMA-driven sampling at 1 us intervals on Cortex-M4 and RX100 controllers. With ±1 LSB INL and ±0.7 LSB DNL, the ISL26708 offers clean code transitions - important for calibrated readout lookup tables in industrial weighing or HVAC controllers.
Recomendado
Battery-Operated Handheld Test Equipment
For a portable digital multimeter or hand-held field tester, the ISL26708IRTZ-T7A balances 1 MSPS speed with low 8 mW dissipation at 3 V supply, extending battery runtime over successive conversions. The 1 uA power-down current lets the part sleep between user-triggered samples. The 8-TDFN-EP 3 x 3 mm PCB footprint leaves room for a compact handheld enclosure. The 2.7 V to 5.25 V supply range directly accepts 2x AA or single-cell Li-ion 3.7 V without DC-DC conversion. The deterministic latency of the SAR conversion makes trigger-to-USB transfers simple to implement without the need for windowing logic.
Recomendado
Industrial Digital Setpoint / Threshold Detection
Use the ISL26708IRTZ-T7A for on-board digital threshold detection in industrial setpoint cards, where an analog sensor must be compared against an 8-bit threshold table inside an FPGA or MCU. An 8-bit ADC is the natural data width for 1-of-256 threshold tables and exponential-mapped log detectors, and 1 MSPS guarantees the comparator keeps up with mains-frequency zero-crossing schemes on sub-cycle resolution. The 2.5 V external reference input accepts standard industrial 2.048 V / 2.500 V / 4.096 V references from TL431 or REF packages - convenient for setpoint cards that need to track precise voltage rails. The exposed thermal pad handles sustained operation across industrial -40 C to +85 C ambient.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ISL26708IRTZ-T7A — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ISL26708IRTZ | ISL26708IRTZ-T | ISL26710IRTZ | ISL26712IRTZ |
|---|---|---|---|---|---|
| Package | 8-TDFN-EP 3x3 mm | 8-TDFN-EP 3x3 mm - same | 8-TDFN-EP 3x3 mm - same | 8-TDFN-EP 3x3 mm - same | 8-TDFN-EP 3x3 mm - same |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Resolution | 8 bit | 8 bit - same | 8 bit - same | 10 bit - higher | 12 bit - higher |
| Sampling Rate | 1 MSPS | 1 MSPS - same | 1 MSPS - same | 1 MSPS - same | 1 MSPS - same |
| Analog Supply | 2.7 V to 5.25 V | 2.7 V to 5.25 V - same | 2.7 V to 5.25 V - same | 2.7 V to 5.25 V - same | 2.7 V to 5.25 V - same |
| Number of Channels | 1 | 1 | 1 | 1 | 1 |
| Serial Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE - same | SPI / QSPI / MICROWIRE - same | SPI / QSPI / MICROWIRE - same | SPI / QSPI / MICROWIRE - same |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C - same | -40 C to +85 C - same | -40 C to +85 C - same | -40 C to +85 C - same |
Diferenciadores clave
- Drop-in upgrade path to higher resolutions on same footprint (frente a ISL26712IRTZ)
- Code-identical tape-and-reel pinout, family-only differentiator (frente a ISL26708IRTZ-T)
- Wide 2.7 V to 5.25 V supply range eliminates level translator (frente a ADS7862 (lower voltage family))
- 1 uA power-down current suits battery-powered scanners (frente a ADS7862 (continuous quiescent draw))
Notas de diseño
Bypass AVDD with a 10 uF bulk ceramic plus a 100 nF high-frequency capacitor placed within 5 mm of the pin. Connect AGND and the exposed thermal pad (EP) to a low-impedance analog ground pour that is star-grounded to the system ground return. Use separate analog and digital ground planes joined only at the AGND pin to keep digital return currents off the analog reference path.
Driving the analog input with bandwidth above 60 MHz and insufficient anti-alias filtering causes repeat-code artefacts in the SAR comparison; add a simple RC (50 ohm + 1 nF) at IN+ for sensors with fast edges. Drive CNVST from a clean, low-jitter MCU timer pin - rise time slower than 5 ns extends the aperture and shifts result codes. Switch the SPI clock only after CNVST is asserted low to avoid bus contention on SDOUT.
Estimated: at 1 MSPS with SPI clock at 24 MHz (24 clocks per sample), throughput = 1 MSPS / conversion. For long PCB traces (over 50 mm) between MCU SCLK and the ADC SDOUT, add 33 ohm source-series damping on SCLK to limit ringback - this protects the part's input protection diodes and prevents intermittent comparison errors at higher serial clock rates.
Estimated: sustained 1 MSPS at 5 V supply dissipates ~18 mW. With theta_JA of the 8-TDFN-EP 3 x 3 mm package around 65 C/W on a 1 oz 1 in² copper pour, junction temperature rises ~1.2 C above ambient - well within the -40 C to +85 C industrial range for normal lab conditions, but PCB copper reduction to less than 0.5 in² raises junction rise above 4 C and is not recommended in sealed industrial enclosures.
Información de cumplimiento
RoHS and halogen-free per Renesas / Intersil datasheet package notes; not AEC-Q100 qualified - for automotive applications, evaluate the ISL26311 / ISL26312 family instead.
