ISLA222S25IR1Z - Dual 12-Bit 250MSPS JESD204B ADC | Renesas
MPN: ISLA222S25IR1Z ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $43.09 | $43.09 |
| 10 | $40.2 | $402.00 |
| 100 | $35.8 | $3,580.00 |
| 500 | $32.1 | $16,050.00 |
| 1,000 | $29.5 | $29,500.00 |
| 2,500 | $27.4 | $68,500.00 |
ISLA222S25IR1Z Overview
An ADC (analog-to-digital converter) is an integrated circuit that samples continuous analog signals and converts them into discrete digital codes for processing by FPGAs, ASICs, or microprocessors. Within the system hierarchy, the ISLA222S25IR1Z sits in the signal chain between the analog front end (amplifiers, filters, drivers) and the digital processing block; its sampling rate, resolution, and interface protocol determine the achievable instantaneous bandwidth and dynamic range of the receiving system. The JESD204B subclass 1 standard transport layer ensures deterministic latency across multiple converters, which is essential for beamforming, phased-array radar, and multi-channel test instruments where sub-sample timing alignment matters.
Key features include dual 12-bit channels at 250 MSPS (200/125 MSPS variants available in the same family), 7.4 effective number of bits at Nyquist, integrated multi-chip synchronization for multi-lane alignment, automatic and power-on calibration for gain and offset, a soft reset pin, and a 1.8 V analog/digital supply with low power consumption. The 48-QFN (7x7) plastic package is RoHS-compliant and uses a heat-spreading exposed pad for thermal management.
The FemtoCharge™ switched-capacitor architecture keeps aperture latency small and consistent across temperature, while the on-chip calibration engine continuously trims gain and offset. Together these features yield excellent spurious-free dynamic range and signal-to-noise ratio across the second and third Nyquist zones, supporting direct IF sampling and high-IF telecom designs.
Typical applications include multi-channel software-defined radio receivers, phased-array radar and sonar front-ends, medical imaging systems, high-end oscilloscopes and digitizers, communications test equipment, and broadband satellite receivers where dual-channel alignment and deterministic latency are mandatory.
When designing with this ADC, route the JESD204B serial lanes with 100-ohm differential impedance and length-match traces within the inter-pair skew budgets defined in the Renesas JESD204B hardware design guide. Decouple AVDD and DVDD pins individually with 1uF and 0.1uF capacitors, and bond the exposed pad to a continuous ground pour to maintain the package thermal resistance.
This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.
Drop-in alternatives for ISLA222S25IR1Z — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ISLA222S25IR1Z (same form factor and footprint) — differing in Architecture, Operating Temperature, Input Type, Number of Channels, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISLA222P25IRZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ISLA222S20IR1Z
✅ Drop-In📋 Reference alternative (not in catalog)
ISLA222S12IR1Z
✅ Drop-In✓ In Stock
$23.1 / Unit
View Datasheet →ISLA214P25IRZ
✅ Drop-In✓ In Stock
$24.9 / Unit
View Datasheet →ISLA222S25IR1Z Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Sampling Rate (max) | 250 MSPS |
| Number of Channels | 2 (dual) |
| Architecture | SAR / FemtoCharge switched-capacitor |
| Data Output Interface | JESD204B subclass 1 serial |
| Family Sample Rates | 125 / 200 / 250 MSPS |
| Family Resolutions | 12-bit and 14-bit (pin-compatible family) |
| ADC Input Type | Single-ended analog inputs |
| Supply Voltage (analog/digital) | 1.8 V |
| Multi-chip Synchronization | Yes (JESD204B SYSREF) |
| Calibration | Auto / power-on / soft-reset calibration |
| Operating Temperature | -40 C to +85 C |
| Package | 48-QFN (7x7) with exposed pad |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Manufacturer Process Technology | Standard CMOS with FemtoCharge technology |
ISLA222S25IR1Z Pin Configuration
| Pin 1 | AIN1+ — Differential analog input channel 1, positive |
| Pin 2 | AIN1- — Differential analog input channel 1, negative |
| Pin 3 | AVDD1.8 — 1.8V analog supply |
| Pin 4 | AGND — Analog ground |
| Pin 5 | AVDD1.8 — 1.8V analog supply |
| Pin 6 | AVDD1.8 — 1.8V analog supply |
| Pin 7 | AVDD1.8 — 1.8V analog supply |
| Pin 8 | AVDD1.8 — 1.8V analog supply |
| Pin 9 | AGND — Analog ground |
| Pin 10 | AVDD1.8 — 1.8V analog supply |
| Pin 11 | AVDD1.8 — 1.8V analog supply |
| Pin 12 | AGND — Analog ground |
| Pin 13 | AIN2+ — Differential analog input channel 2, positive |
| Pin 14 | AIN2- — Differential analog input channel 2, negative |
| Pin 15 | CLK+ — Differential clock input, positive |
| Pin 16 | CLK- — Differential clock input, negative |
| Pin 17 | DVDD1.8 — 1.8V digital supply |
| Pin 18 | DGND — Digital ground |
| Pin 19 | SYSREF+ — JESD204B SYSREF input, positive |
| Pin 20 | SYSREF- — JESD204B SYSREF input, negative |
| Pin 21 | SYNC~ — JESD204B SYNC~ request input (active low) |
| Pin 22 | RESETn — Soft reset (active low) |
| Pin 23 | CSn — SPI chip select (active low) |
| Pin 24 | SCLK — SPI clock |
| Pin 25 | SDIO — SPI data I/O |
| Pin 26 | SDO — SPI data out |
| Pin 27 | CAL_RUN — Calibration run status output |
| Pin 28 | DGND — Digital ground |
| Pin 29 | DOUT0+ — JESD204B serial lane 0, positive |
| Pin 30 | DOUT0- — JESD204B serial lane 0, negative |
| Pin 31 | DOUT1+ — JESD204B serial lane 1, positive |
| Pin 32 | DOUT1- — JESD204B serial lane 1, negative |
| Pin 33 | DOUT2+ — JESD204B serial lane 2, positive |
| Pin 34 | DOUT2- — JESD204B serial lane 2, negative |
| Pin 35 | DOUT3+ — JESD204B serial lane 3, positive |
| Pin 36 | DOUT3- — JESD204B serial lane 3, negative |
| Pin 37 | DGND — Digital ground |
| Pin 38 | DVDD1.8 — 1.8V digital supply |
| Pin 39 | DVDD1.8 — 1.8V digital supply |
| Pin 40 | DVDD1.8 — 1.8V digital supply |
| Pin 41 | DGND — Digital ground |
| Pin 42 | DGND — Digital ground |
| Pin 43 | DVDD1.8 — 1.8V digital supply |
| Pin 44 | DVDD1.8 — 1.8V digital supply |
| Pin 45 | DGND — Digital ground |
| Pin 46 | DGND — Digital ground |
| Pin 47 | DGND — Digital ground |
| Pin 48 | DGND — Digital ground |
Typical Applications
ISLA222S25IR1Z is suitable for 6 applications: Multi-Channel Software-Defined Radio (SDR), Phased-Array Radar and Beamforming Front-End, Medical Imaging Acquisition Systems, High-End Oscilloscope and Digitizer Input Stage, Broadband Satellite and Microwave Receiver, Communications Test Equipment and Signal Analyzers.
Multi-Channel Software-Defined Radio (SDR)
The ISLA222S25IR1Z's dual-channel 250 MSPS throughput plus JESD204B subclass 1 deterministic latency make it ideal for multi-channel SDR receivers. According to the Renesas ISLA222S datasheet, the SYSREF-based multi-chip synchronization aligns multiple converters across the array, while the 12-bit resolution provides >7 ENOB typical for high-IF sampling. Placed after the analog front-end LNA and quadrature down-mixer, the ADC digitizes the I/Q baseband or a high-IF signal and forwards packets over the JESD204B lanes to an FPGA running the digital down-converter. Compared with parallel LVDS ADCs, the serial interface dramatically simplifies board routing at multi-channel densities; trade-off is the FPGA must contain a JESD204B IP core.
Recommended
Phased-Array Radar and Beamforming Front-End
The ISLA222S25IR1Z supports phased-array and beamforming front-ends through JESD204B's deterministic SYSREF synchronization, which holds multiple ADCs phase-coherent across the antenna array. According to the Renesas datasheet, the dual channels per IC halve the board footprint per element, and the 250 MSPS sample rate captures the full radar IF bandwidth without aliasing. The converter sits between the limiter/LNA and the FPGA digital beamformer, where it provides aligned I/Q samples for each sub-array. Designers should length-match the JESD204B serial lanes to within the inter-pair skew spec and provide a low-jitter SYSREF clock for repeatable sub-sample alignment across the array.
Recommended
Medical Imaging Acquisition Systems
In ultrasound and other medical imaging acquisition systems, the ISLA222S25IR1Z provides simultaneous dual-channel sampling at 250 MSPS which directly matches the dynamic range needs of ultrasound receive beamforming. According to Renesas, the FemtoCharge architecture maintains small aperture delay variation across temperature, allowing tight phase alignment between transducer channels - critical for image resolution. The ADC is positioned after the time-gain-compensation (TGC) amplifier and ahead of the FPGA demodulator/beamformer, with JESD204B serialization reducing the cable and connector count between the probe head and the back-end. Trade-off is the 1.8 V supply must be clean (PSRR >60 dB) for low-side leakage into the imaging data.
Recommended
High-End Oscilloscope and Digitizer Input Stage
Test-and-measurement oscilloscopes and wideband digitizers use the ISLA222S25IR1Z as a per-channel ADC when dual-channel 250 MSPS capture is sufficient. According to the Renesas datasheet, the 7+ effective number of bits and the FemtoCharge technology's aperture stability preserve waveform integrity across temperature, while JESD204B serializes the data to a memory controller/ASIC. The ADC follows the input attenuator and front-end amplifier, allowing the instrument to digitize both channels in lock-step. For oscilloscope channels requiring >1 GSPS, consider the ADC12J4000 family; the ISLA222S25IR1Z is the right fit for lower-bandwidth measurement and data-acquisition cards.
Recommended
Broadband Satellite and Microwave Receiver
Broadband satellite down-converters and microwave receivers benefit from the ISLA222S25IR1Z's ability to directly sample intermediate frequencies in the second and third Nyquist zones, eliminating a down-mixer stage. According to Renesas, the part's SFDR and SNR across the second Nyquist make it suitable for L-band and S-band IF digitization. Used between the LNA/sampler block and the FPGA demodulator, the dual channels support two independent IF chains in one chip, reducing BOM cost. Designers should provide a bandpass anti-alias filter ahead of the ADC inputs and verify the AVDD supply ripple is below 1 mVpp at the sampling clock fundamental to avoid spurious coupling.
Recommended
Communications Test Equipment and Signal Analyzers
Wireless test sets, vector signal analyzers and cable-TV head-end test equipment use the ISLA222S25IR1Z as a dual-channel baseband or IF digitizer when deterministic latency and high spurious-free dynamic range are required. The JESD204B subclass 1 transport layer preserves channel-to-channel phase alignment, which is critical for modulation-error-rate (MER) measurements on quadrature signals. The chip sits ahead of the FPGA running the demodulator/decoding chain. Per the Renesas datasheet, the FemtoCharge architecture keeps aperture delay consistent across temperature, easing the thermal management budget for the test instrument's tightly packed signal path.
Recommended
Recommended Products Summary
Engineering reference data for ISLA222S25IR1Z — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISLA222P25IRZ | ISLA222S20IR1Z | ISLA222S12IR1Z | ISLA214P25IRZ |
|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 48-QFN (7x7) | 48-QFN (7x7) - same | 48-QFN (7x7) - same | 48-QFN (7x7) - same | 48-QFN (7x7) - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 14 bits |
| Max Sample Rate | 250 MSPS | 250 MSPS | 200 MSPS | 125 MSPS | 250 MSPS |
| Channels | 2 | 2 | 2 | 2 | 2 |
| Output Interface | JESD204B subclass 1 | Parallel LVDS | JESD204B subclass 1 | JESD204B subclass 1 | Parallel LVDS |
| Multi-chip Sync (SYSREF) | Yes | No (parallel LVDS) | Yes | Yes | No (parallel LVDS) |
| Supply Voltage | 1.8 V | 1.8 V | 1.8 V | 1.8 V | 1.8 V |
| Architecture | FemtoCharge SAR | FemtoCharge SAR | FemtoCharge SAR | FemtoCharge SAR | FemtoCharge SAR |
Key Differentiators
- Dual-channel 250 MSPS JESD204B with multi-chip synchronization (vs ISLA222P25IRZ)
- Highest sample rate in the ISLA222S family (vs ISLA222S20IR1Z)
- Lower-resolution node of a pin-compatible family (vs ISLA214P25IRZ)
- FemtoCharge SAR architecture with auto-calibration (vs ISL26712IHZ-T)
Design Notes
Route the four JESD204B serial differential lanes (DOUT0+/DOUT0-/DOUT1+/DOUT1-/DOUT2+/DOUT2-/DOUT3+/DOUT3-) as 100-ohm differential pairs on the top layer beneath a continuous ground plane. Length-match all four pairs within ±10 ps to meet the inter-pair skew budget for 5 Gbps operation. Keep total lane length under 200 mm to stay inside the JESD204B channel loss budget; add a pre-emphasis or AC-coupling cap selection per the Renesas hardware design guide if the run exceeds this.
Estimated: per-channel power consumption for the ISLA222S25IR1Z at 250 MSPS dual-channel is roughly 1.1 W total (assuming 0.55 W per channel from the FemtoCharge data). With AVDD + DVDD combined at 1.8 V, the supply current is approximately 610 mA. Use at least one 10uF ceramic plus a 0.1uF ceramic placed within 3 mm of each AVDD pin to keep switching transients out of the analog input band; the Renesas datasheet recommends ferrite-bead separation between AVDD and DVDD to avoid digital-noise coupling into the analog front end.
Drive the CLK+/CLK- differential clock with a low-jitter (<100 fs RMS) LVPECL or LVDS oscillator. The aperture delay of the ISLA222S25IR1Z is sensitive to clock edge slope, so keep the differential clock rise time under 50 ps by placing the clock buffer within 25 mm of the clock pins. Mismatch in the CLK+/CLK- trace lengths greater than 1 ps will directly convert into channel-to-channel phase skew that the SYSREF cannot fully compensate for.
The 48-QFN exposed pad must be soldered to a continuous 1 sq inch copper pour with at least 12 thermal vias (8 mil pitch) connecting to the internal ground plane. Estimated: at 1.1 W total dissipation and a theta-JA around 30 C/W on a 4-layer JEDEC test board, the junction-temperature rise above ambient is around 33 C; derate linearly above 85 C ambient or add a heatsink for aerospace/industrial deployments.
Do not enable SYSREF before the clock is stable; the JESD204B ILAS step requires a coherent reference. Forget to enable the chip's automatic calibration (CAL_RUN) on power-up, which leaves residual gain/offset error across the input range. Per the Renesas datasheet, always perform a soft reset (RESETn pulse >10 ns) after DVDD reaches its 1.8 V rail before issuing the first SPI configuration write.
Compliance Information
RoHS-compliant 48-QFN plastic package per Renesas/Intersil product page. Not AEC-Q100 qualified - this ADC targets industrial/commercial systems, not automotive. Halogen-free status not explicit in supplied data - listed as unknown.
