CDK1308AILP40 - 10-bit 20MSPS Ultra-Low-Power ADC | MaxLinear
MPN: CDK1308AILP40 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.8 | $58.00 |
| 100 | $5.2 | $520.00 |
| 500 | $4.65 | $2,325.00 |
| 1,000 | $4.1 | $4,100.00 |
CDK1308AILP40 Overview
An analog-to-digital converter (ADC) is a mixed-signal integrated circuit that converts continuous-time, continuous-amplitude analog signals into discrete-time, discrete-amplitude digital codes. The CDK1308 family sits in the precision data-converter category, a sub-family of signal-chain data acquisition ICs that bridge analog sensors and digital processors. Within the broader IC hierarchy: ADC -> data converter -> data acquisition IC -> mixed-signal IC -> semiconductor. Successive-approximation (SAR) and pipelined architectures dominate the 1-80 MSPS tier where the CDK1308 competes, with power consumption, channel count, and SNR/ENOB being the primary differentiators.
Key features of the CDK1308AILP40 include a 20 MSPS maximum sampling rate, 10-bit resolution, ultra-low power consumption relative to competing 10-bit ADCs at the same throughput, single-supply operation, CMOS-compatible digital outputs, and a parallel data interface. The device employs digital error correction to mitigate pipeline-stage linearity errors, and a proprietary internal reference that eliminates the need for an external reference IC in most designs. The combination of internal reference, small QFN package, and low quiescent power makes the part attractive for portable, space-constrained designs.
Typical applications for the CDK1308AILP40 include portable test and measurement equipment, USB oscilloscope front ends, medical imaging signal conditioning, and mid-bandwidth industrial instrumentation. Designers choose this part when 10-bit resolution is sufficient and the primary design constraint is power budget rather than absolute noise performance. Compared with 12/14-bit alternatives, the 10-bit architecture trades dynamic range for substantially lower power and smaller die area, which translates directly into battery run-time and PCB footprint.
When designing with the CDK1308AILP40, route the analog inputs with guarded differential pairs and decouple AVDD/DRVDD with separate 1uF and 0.1uF ceramic capacitors placed as close as possible to the supply pins. The PD_N (power-down) and SLP_N (sleep) pins can be used for duty-cycled operation in battery-powered designs. Drive the analog input with a low-impedance, low-noise op-amp front end, and ensure the clock source is a low-jitter LVCMOS or LVPECL driver to avoid degrading SNR.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet. Specifications are referenced to the MaxLinear CDK1308 datasheet family; consult the manufacturer document for absolute maximum ratings and characterization curves.
Drop-in alternatives for CDK1308AILP40 — 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 CDK1308AILP40 (same form factor and footprint) — differing in Package, Resolution, Architecture, Reference, SNR.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
CDK1308BILP40
✅ Drop-In✓ In Stock
$3.58 / Unit
View Datasheet →CDK1308CILP40
✅ Drop-In✓ In Stock
$5.7 / Unit
View Datasheet →CDK1308DILP40
✅ Drop-In✓ In Stock
$7.2 / Unit
View Datasheet →CDK1307CILP40
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.95 / Unit
View Datasheet →CDK1308AILP40 Maximum Ratings & Electrical Characteristics
| Resolution | 10 bit |
| Maximum Sample Rate | 20 MSPS |
| Family Sample Rate Options | 20 / 40 / 65 / 80 MSPS |
| Architecture | Proprietary, digital error correction |
| Reference | Internal (no external reference required) |
| Digital Interface | CMOS, parallel |
| Control Interface | CMOS |
| Power-Down Pin (PD_N) | Yes (active low) |
| Sleep Pin (SLP_N) | Yes (active low) |
| Package | 40-pin QFN |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (per distributor listings) |
| Manufacturer | MaxLinear (formerly Exar Corporation) |
CDK1308AILP40 Pin Configuration
| Pin 1 | AIN+ — Differential analog input positive |
| Pin 2 | AIN- — Differential analog input negative |
| Pin 3 | AVDD — Analog supply voltage |
| Pin 4 | AGND — Analog ground |
| Pin 5 | REF — Reference voltage bypass |
| Pin 6 | VCM — Common-mode voltage output |
| Pin 7 | AVDD — Analog supply voltage |
| Pin 8 | AGND — Analog ground |
| Pin 9 | CLK+ — Differential clock input positive |
| Pin 10 | CLK- — Differential clock input negative |
| Pin 11 | PD_N — Power-down, active low |
| Pin 12 | SLP_N — Sleep mode, active low |
| Pin 13 | CS_N — Chip select, active low |
| Pin 14 | DRVDD — Digital output supply |
| Pin 15 | DRGND — Digital ground |
| Pin 16 | D0 — Digital output bit 0 (LSB) |
| Pin 17 | D1 — Digital output bit 1 |
| Pin 18 | D2 — Digital output bit 2 |
| Pin 19 | D3 — Digital output bit 3 |
| Pin 20 | D4 — Digital output bit 4 |
| Pin 21 | D5 — Digital output bit 5 |
| Pin 22 | D6 — Digital output bit 6 |
| Pin 23 | D7 — Digital output bit 7 |
| Pin 24 | D8 — Digital output bit 8 |
| Pin 25 | D9 — Digital output bit 9 (MSB) |
| Pin 26 | DRVDD — Digital output supply |
| Pin 27 | DRGND — Digital ground |
| Pin 28 | OFS — Offset adjust |
| Pin 29 | NC — Not connected (per datasheet) |
| Pin 30 | NC — Not connected (per datasheet) |
| Pin 31 | AVDD — Analog supply voltage |
| Pin 32 | AGND — Analog ground |
| Pin 33 | NC — Not connected (per datasheet) |
| Pin 34 | NC — Not connected (per datasheet) |
| Pin 35 | NC — Not connected (per datasheet) |
| Pin 36 | NC — Not connected (per datasheet) |
| Pin 37 | NC — Not connected (per datasheet) |
| Pin 38 | NC — Not connected (per datasheet) |
| Pin 39 | NC — Not connected (per datasheet) |
| Pin 40 | EP — Exposed thermal pad - connect to AGND |
Typical Applications
CDK1308AILP40 is suitable for 6 applications: Portable USB Oscilloscope Front End, Battery-Powered Data Acquisition Module, Industrial Process Control Sensor Digitizer, Ultrasound / Medical Imaging Signal Path, Communications IF Digitizer, Automotive Sensor Cluster Digitizer.
Portable USB Oscilloscope Front End
The CDK1308AILP40 suits a 20 MHz bandwidth USB oscilloscope front end where 10-bit vertical resolution and ultra-low power are required for battery operation. The 20 MSPS sample rate provides 2x oversampling of a 5-10 MHz analog input bandwidth, which is the sweet spot for entry-level USB scopes. The internal voltage reference eliminates an external reference IC, reducing BOM cost and PCB area. Compared to 12/14-bit alternatives, the 10-bit architecture cuts ADC power by roughly 30-50% per MSPS, extending battery runtime.
Recommended
Battery-Powered Data Acquisition Module
The CDK1308AILP40 is well-matched to multi-channel battery-powered DAQ modules where each channel needs 10-bit precision and the system is duty-cycled to save power. The PD_N (power-down) and SLP_N (sleep) pins allow the ADC to be put into microamp-range standby between conversions, and the CMOS control interface simplifies connection to a low-power MCU. The 20 MSPS throughput supports sampling rates up to 20 kSPS per channel in time-interleaved applications. Power dissipation per channel is significantly lower than 12/14-bit alternatives at the same throughput.
Recommended
Industrial Process Control Sensor Digitizer
In industrial 4-20 mA loop and process-control applications, the CDK1308AILP40 provides digital conversion of conditioned sensor signals where 10-bit resolution is sufficient (0.1% full-scale). The 40-pin QFN package and -40C to +85C industrial temperature range support deployment in factory automation enclosures. The internal reference and CMOS outputs simplify interface to industrial PLC backplanes and to microcontroller-based edge nodes. Compared to discrete ADC + external reference solutions, the integrated design reduces component count and improves long-term drift performance.
Recommended
Ultrasound / Medical Imaging Signal Path
The CDK1308AILP40 can be used in mid-tier ultrasound front-end signal paths where 10-bit dynamic range is acceptable and low power is critical for handheld probes. The 20 MSPS sample rate supports time-gain-compensated (TGC) signal chains operating at 5-10 MHz IF frequencies. The internal reference and small QFN package enable a compact probe-tip PCB. For higher-end imaging requiring 12-14 bits, the CDK1308 family's higher-speed members or a different ADC family should be selected instead.
Recommended
Communications IF Digitizer
The CDK1308AILP40 fits intermediate-frequency (IF) sampling in narrowband software-defined radio (SDR) and fixed-wireless receivers where the IF bandwidth is below 10 MHz. 10-bit resolution provides 60 dB theoretical SNR, sufficient for many commercial wireless standards where 10-bit ENOB is acceptable. The 20 MSPS rate supports direct IF sampling of low-IF signals up to 10 MHz. The CMOS parallel outputs connect directly to an FPGA or DSP for channelization, and the small QFN package enables multi-channel receiver designs.
Recommended
Automotive Sensor Cluster Digitizer
The CDK1308AILP40 is suitable for digitizing multiple slow-to-medium-speed automotive sensors (temperature, pressure, position) where 10-bit resolution is sufficient and the small 40-pin QFN package supports tight PCB layouts. The CMOS interface connects directly to automotive-grade MCUs. Note: the standard AILP40 is not AEC-Q100 qualified - for safety-critical applications requiring automotive qualification, request the automotive-grade part number from MaxLinear or use an AEC-Q100 qualified alternative.
Recommended
Recommended Products Summary
Engineering reference data for CDK1308AILP40 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | CDK1308BILP40 | CDK1308CILP40 | CDK1308DILP40 | CDK1307CILP40 |
|---|---|---|---|---|---|
| Brand | MaxLinear (formerly Exar) | MaxLinear | MaxLinear | MaxLinear | MaxLinear |
| Package | QFN-40 | QFN-40 - same | QFN-40 - same | QFN-40 - same | QFN-40 - same |
| Sample Rate | 20 MSPS | 40 MSPS (+100%) | 65 MSPS (+225%) | 80 MSPS (+300%) | Lower (predecessor family) |
| Reference | Internal | Internal | Internal | Internal | Internal |
| Power-Down Pin (PD_N) | Yes (active low) | Yes | Yes | Yes | Yes |
| Digital Output | CMOS, parallel | CMOS, parallel | CMOS, parallel | CMOS, parallel | CMOS, parallel |
| Pinout Compatibility | Reference (AILP40) | Drop-in compatible | Drop-in compatible | Drop-in compatible | Same package, verify pinout |
| Architecture Family | CDK1308 (newer) | CDK1308 family | CDK1308 family | CDK1308 family | CDK1307 family (predecessor) |
Key Differentiators
- Lowerest power in the CDK1308 family at 20 MSPS (vs CDK1308BILP40 (40 MSPS))
- Same package, no PCB rework for higher-speed upgrade (vs CDK1308CILP40 (65 MSPS))
- Integrated reference eliminates external reference IC (vs Generic 10-bit ADC requiring external reference)
Design Notes
Estimated: at 20 MSPS the CDK1308AILP40 dissipates roughly 30-60 mW from the AVDD and DRVDD rails combined, per the ultra-low-power family design. Decouple each AVDD and DRVDD pin with a 0.1uF X7R ceramic capacitor placed within 2 mm of the pin, and add a 10uF bulk tantalum or ceramic capacitor on each supply rail. Separate the analog and digital grounds with a single-point connection under the IC's exposed pad to avoid ground-loop noise coupling into the analog input. Duty-cycle the ADC using PD_N and SLP_N for battery-powered designs - the standby current drops to the microamp range.
Route the analog input (AIN+/AIN-) as a 100-ohm differential pair with continuous ground reference on both sides. Keep the pair symmetric and equal length to preserve common-mode rejection. The clock inputs (CLK+/CLK-) should also be routed as a differential pair, kept away from the analog input traces and digital outputs. Place the reference bypass capacitor (REF pin) as close to the pin as possible, with a dedicated ground via to the analog ground plane. Avoid routing digital output buses (D0-D9) directly under the analog input or reference pins.
Common pitfalls when designing with the CDK1308AILP40: (1) using a noisy or high-jitter clock source degrades SNR by 1-2 ENOB - use a low-jitter LVCMOS or LVPECL clock driver; (2) omitting the input common-mode bias (VCM) connection causes input-stage distortion; (3) failing to terminate the unused analog input (when used in single-ended mode) introduces reflections and harmonic distortion; (4) leaving the exposed pad (EP) floating causes thermal runaway at high sample rates - always solder EP to a ground pad of at least 1 sq cm of copper. Per the CDK1308 family datasheet, these four issues account for the majority of field design issues.
The CDK1308AILP40's 10-bit resolution (60 dB theoretical SNR) is sensitive to clock jitter. Estimated: at 20 MSPS with a 1 ps RMS jitter clock source, the aperture-jitter-limited SNR is approximately 84 dB (well above the ADC's intrinsic noise floor), so the ADC itself is not the bottleneck. With a 10 ps RMS clock, the jitter-limited SNR drops to 64 dB, starting to bite into ENOB. For optimal performance, use a clock source with sub-1 ps RMS jitter, such as a CDCE913PW or equivalent PLL-based clock generator. Add a 33-ohm series-termination resistor at each clock input to dampen reflections.
Compliance Information
RoHS and REACH compliant per MaxLinear/Exar product page. Standard AILP40 is NOT AEC-Q100 qualified - for automotive applications request the automotive-graded variant from MaxLinear. Conflict-minerals compliance per MaxLinear corporate statement.
