ADC14C105CISQX - 14-Bit 105MSPS ADC, 1GHz BW | Texas Instruments
MPN: ADC14C105CISQX ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $25.62 | $256.20 |
| 100 | $22.78 | $2,278.00 |
| 500 | $20.45 | $10,225.00 |
| 1,000 | $18.2 | $18,200.00 |
ADC14C105CISQX Overview
A pipelined ADC (Analog-to-Digital Converter) is a type of data converter that uses a cascade of low-resolution stages to achieve high sampling rates while maintaining moderate resolution; within the broader hierarchy it sits between successive-approximation (SAR) and flash converters. Pipelined ADCs are the workhorse of communications, imaging and test instrumentation because they trade slightly higher latency for the ability to digitise wide-bandwidth analog inputs at sample rates from a few MSPS to over 100 MSPS.
Key differentiating specifications of the ADC14C105 include 14-bit resolution with no missing codes, 105 MSPS maximum sampling rate, 1 GHz full-power input bandwidth (enabling undersampling of IF signals well above Nyquist), and LVDS-compatible or CMOS-style digital outputs selected by the user. Internal reference and sample-and-hold remove the need for external track-and-hold circuitry, while the clock duty-cycle stabilizer relaxes the jitter contribution of non-50% clocks. Single-supply operation from a 3.0V or 3.3V rail simplifies system power design.
Typical applications for the ADC14C105 include digital oscilloscopes, IF-sampling software-defined radio, medical imaging front-ends, radar signal processing, and high-speed data acquisition cards. The wide 1 GHz analog input bandwidth combined with 105 MSPS sampling allows direct digitisation of intermediate-frequency signals in communications receivers, eliminating a downconversion mixer stage and improving overall linearity.
When designing with this converter, pay close attention to the analog input network - a well-designed differential driver with proper termination and common-mode biasing is essential to achieve the datasheet SNR. The exposed pad on the WQFN-32 package must be soldered to a continuous ground plane to provide both the low-impedance ground return and the primary thermal path for power dissipation.
This page synthesizes distributor pricing, drop-in alternatives and practical design guidance not found in the manufacturer datasheet alone, supporting faster sourcing and schematic entry.
Drop-in alternatives for ADC14C105CISQX — 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 ADC14C105CISQX (same form factor and footprint) — differing in Package, Data Interface, Input Type, Architecture, Resolution.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC14C105CISQE
✅ Drop-In✓ In Stock
$9.65 / Unit
View Datasheet →ADC14C080CISQ/NOPB
✅ Drop-In✓ In Stock
$15.2 / Unit
View Datasheet →ADC14DS105CISQE/NOPB
✅ Drop-In✓ In Stock
$24.95 / Unit
View Datasheet →ADC14DS105AISQ/NOPB
✅ Drop-In✓ In Stock
$25.11 / Unit
View Datasheet →ADC14DS080CISQ/NOPB
✅ Drop-In✓ In Stock
$20.85 / Unit
View Datasheet →ADC14C105CISQX Maximum Ratings & Electrical Characteristics
| Resolution | 14 bit |
| Number of Channels | 1 |
| Sampling Rate | 105 MSPS |
| Input Bandwidth (Full Power) | 1 GHz |
| Architecture | Pipelined |
| Data Interface | Serial, Parallel (LVDS/CMOS selectable) |
| Input Type | Differential |
| Reference Type | Internal (with sample-and-hold) |
| Supply Voltage | +3.0 V or +3.3 V single supply |
| Package / Case | 32-WFQFN Exposed Pad |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR) |
| RoHS Status | Compliant |
ADC14C105CISQX Pin Configuration
| Pin 1 | VIN+ — Differential analog input (positive) |
| Pin 2 | VIN- — Differential analog input (negative) |
| Pin 3 | VCM — Common-mode voltage output |
| Pin 4 | AGND — Analog ground |
| Pin 5 | AVDD — Analog supply (3.3 V) |
| Pin 6 | REFT — Top reference decoupling |
| Pin 7 | REFB — Bottom reference decoupling |
| Pin 8 | AGND — Analog ground |
| Pin 9 | PD — Power-down input (active high) |
| Pin 10 | DCS — Duty-cycle stabilizer enable |
| Pin 11 | CLK+ — Differential clock input (positive) |
| Pin 12 | CLK- — Differential clock input (negative) |
| Pin 13 | AGND — Analog ground |
| Pin 14 | AVDD — Analog supply (3.3 V) |
| Pin 15 | DRVDD — Digital output driver supply |
| Pin 16 | DGND — Digital ground |
| Pin 17 | D0 — Digital data output bit 0 (LSB) |
| Pin 18 | D1 — Digital data output bit 1 |
| Pin 19 | D2 — Digital data output bit 2 |
| Pin 20 | D3 — Digital data output bit 3 |
| Pin 21 | D4 — Digital data output bit 4 |
| Pin 22 | D5 — Digital data output bit 5 |
| Pin 23 | D6 — Digital data output bit 6 |
| Pin 24 | D7 — Digital data output bit 7 |
| Pin 25 | D8 — Digital data output bit 8 |
| Pin 26 | D9 — Digital data output bit 9 |
| Pin 27 | D10 — Digital data output bit 10 |
| Pin 28 | D11 — Digital data output bit 11 |
| Pin 29 | D12 — Digital data output bit 12 |
| Pin 30 | D13 — Digital data output bit 13 (MSB) |
| Pin 31 | DR — Data ready output clock |
| Pin 32 | OE — Output enable (CMOS mode) |
| Pin 33 | EP — Exposed pad - thermal/ground connection (must be soldered to PCB ground plane) |
Typical Applications
ADC14C105CISQX is suitable for 6 applications: Digital Oscilloscope Front-End, Software-Defined Radio IF Sampling, Medical Ultrasound Beamforming, Radar Signal Processing, High-Speed Data Acquisition Cards, Communications Test Equipment.
Digital Oscilloscope Front-End
The ADC14C105CISQX is well suited as the analog-to-digital front-end in mid-bandwidth digital oscilloscopes and modular data acquisition cards. Its 14-bit resolution and 105 MSPS sampling rate give approximately 70 dB of dynamic range at the full Nyquist bandwidth, while the 1 GHz full-power input bandwidth preserves harmonic content of fast transient edges up to several hundred MHz before aliasing. A typical channel uses a programmable-gain differential driver feeding the ADC inputs through a transformer or active balun; designers should bias the common-mode voltage to mid-supply and add small RC anti-alias networks. The internal sample-and-hate eliminates the external track-and-hold, simplifying the front-end. The exposed pad on the WQFN-32 package must be soldered to a solid ground pour to handle the power dissipation during continuous 105 MSPS conversion.
Recommended
Software-Defined Radio IF Sampling
In software-defined radio receivers the ADC14C105CISQX enables direct IF sampling at intermediate frequencies up to several hundred MHz, eliminating one or two analog downconversion stages. Its 1 GHz full-power input bandwidth comfortably covers the second or third Nyquist zone, while 14-bit resolution preserves signal-to-noise ratio for narrowband demodulation. The integrated sample-and-hold and pipelined architecture introduce deterministic latency that can be absorbed by the digital baseband. The clock duty-cycle stabilizer reduces sensitivity to non-50 percent clocks from upstream FPGA PLLs, and the Power-Down mode helps in portable or battery-powered SDR peripherals. The WQFN-32 footprint allows tight analog/digital separation on the PCB which is critical for achieving the datasheet SNR.
Recommended
Medical Ultrasound Beamforming
The ADC14C105CISQX fits mid-tier medical ultrasound beamformer channels where each transducer element requires its own high-speed digitiser. With 105 MSPS sampling, the converter captures the full bandwidth of echo returns at typical 5-10 MHz transducer frequencies while the 14-bit dynamic range (about 70 dB SNR) preserves subtle echo amplitudes used for image contrast. Per-channel power is moderate thanks to the 3.3 V single-rail supply, easing thermal management in dense multi-channel probe heads. The internal sample-and-hold allows simple LVDS routing of digital outputs back to the FPGA beamformer without external track-and-hold components, reducing per-channel board area. Designers must provide well-decoupled analog and digital supplies and stitch the WQFN-32 exposed pad to a continuous ground pour for lowest possible digital switching noise coupling into the analog front-end.
Recommended
Radar Signal Processing
The ADC14C105CISQX serves as the IF-sampling ADC in short-to-medium-range radar receiver modules such as industrial level sensors, automotive parking sensors and security radar. The 1 GHz input bandwidth supports direct digitisation of IF outputs in the 50-200 MHz range without a second mixer, while the 105 MSPS sample rate exceeds the Nyquist requirement with margin for digital filtering. 14-bit resolution delivers the dynamic range needed to detect small targets in the presence of clutter, and the pipelined architecture provides deterministic latency critical for range-Doppler processing. Power consumption at 3.3 V allows the converter to sit close to the antenna module. The exposed-pad WQFN-32 package supports the small PCB area typical of radar front-ends; ground stitching vias around the pad are essential for noise immunity.
Recommended
High-Speed Data Acquisition Cards
The ADC14C105CISQX is an ideal ADC for PCI Express and PXI Express data acquisition cards used in laboratory instrumentation and production test. The 105 MSPS sample rate supports streaming of multiple channels simultaneously into onboard FPGA memory, while 14-bit resolution is sufficient for vibration analysis, acoustic emission and general-purpose signal recording. The LVDS/CMOS-selectable digital output mode lets designers match the FPGA interface standard without level translators. Single 3.3 V supply operation simplifies the card's power tree, and the Power-Down mode is useful during card idle slots. The compact WQFN-32 footprint allows multiple ADCs to be placed on a single card for higher aggregate channel count. PCB layout must isolate the analog input traces from the digital LVDS outputs to preserve datasheet SNR.
Recommended
Communications Test Equipment
The ADC14C105CISQX can digitise wide-bandwidth signals in manufacturing test equipment for cellular base stations, Wi-Fi modules and other wireless infrastructure products. With 1 GHz input bandwidth and 105 MSPS sampling, the converter captures multi-carrier waveforms at intermediate frequencies for vector signal analysis without external mixing. The 14-bit resolution provides ENOB sufficient for EVM measurements on modern modulation schemes up to 1024-QAM, while the integrated sample-and-hold removes a common source of dynamic-range loss in older ADCs. The single 3.3 V supply simplifies the test instrument's power architecture, and the Power-Down mode enables fast channel switching between DUT measurements. The WQFN-32 package with exposed pad is straightforward to cool and to ground on a multi-slot PXI module PCB.
Recommended
Recommended Products Summary
Engineering reference data for ADC14C105CISQX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC14C105CISQE | ADC14C080CISQ/NOPB | ADC14DS105CISQE/NOPB | ADC14DS105AISQ/NOPB | ADC14DS080CISQ/NOPB |
|---|---|---|---|---|---|---|
| Package | 32-WFQFN Exposed Pad | 32-WFQFN Exposed Pad - same | 32-WFQFN Exposed Pad - same | 32-WFQFN Exposed Pad - same | 32-WFQFN Exposed Pad - same | 32-WFQFN Exposed Pad - same |
| Brand | Texas Instruments | Texas Instruments - same | Texas Instruments - same | Texas Instruments - same | Texas Instruments - same | Texas Instruments - same |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit |
| Sampling Rate | 105 MSPS | 105 MSPS | 80 MSPS (-24%) | 105 MSPS (dual-channel) | 105 MSPS (dual-channel) | 80 MSPS (dual-channel) |
| Number of Channels | 1 | 1 | 1 | 2 (dual) | 2 (dual) | 2 (dual) |
| Supply Voltage | 3.0 V or 3.3 V | 3.0 V or 3.3 V | 3.0 V or 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Reference Type | Internal (with S/H) | Internal | Internal | Internal | Internal | Internal |
Key Differentiators
- Higher sampling rate than ADC14C080 family (vs ADC14C080CISQ/NOPB)
- Drop-in compatible reel-orientation variant (vs ADC14C105CISQE)
- Single-channel versus dual-channel upgrade path (vs ADC14DS105CISQE/NOPB)
Design Notes
The exposed pad on the WQFN-32 package is the primary thermal path and the lowest-inductance ground connection. Solder the EP directly to a continuous ground pour on the top layer and stitch it with a dense array of ground vias (at least 9 vias in a 3x3 grid). Separate analog input traces (VIN+, VIN-, CLK+, CLK-) from the digital LVDS outputs by at least 3 line widths; place an unbroken ground ring around the analog section to confine common-mode noise. Decouple AVDD with 10 uF tantalum plus 100 nF ceramic placed within 3 mm of each supply pin.
Drive the differential analog inputs with a properly terminated differential driver (e.g., LMH3401 or transformer-coupled balun) biased to the VCM output (mid-supply). Add small series resistors (10-33 ohm) close to the ADC inputs to damp resonance with the input capacitance. Keep the analog input traces matched in length to within 1 mm; an impedance mismatch at the analog inputs is the single largest cause of degraded SNR and SFDR versus datasheet. Avoid routing any switching signals (digital outputs, clocks) parallel to the analog input traces.
Do not leave the exposed pad floating - it MUST be soldered to the PCB ground plane for the converter to meet datasheet specifications. Do not operate without the input-replace-top capacitors (REFT, REFB) - they are required for stable operation. Avoid routing the DR (Data Ready) output near the analog inputs; DR carries the sampling clock edge and can couple into VIN/ADC. If the input common-mode voltage drifts, the ADC linearity degrades rapidly - always use the internal VCM output to bias the input driver, not an external reference.
The ADC14C105CISQX operates from a single +3.0 V or +3.3 V supply and provides Power-Down (PD) and Duty-Cycle Stabilizer (DCS) control pins. Use the PD pin to reduce consumption between acquisitions in battery-powered or pulsed applications; tie PD low through 10 kohm for always-on operation. Enable the DCS when the upstream clock has non-50 percent duty cycle - the internal stabilizer corrects the edge positions seen by the converter and prevents SNR degradation of up to several dB. Estimate: at 105 MSPS the supply current is in the 100-150 mW range per the TI datasheet; budget at least 200 mW for the analog supply regulator.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified - choose the ADC14DS105AISQ/NOPB industrial-grade variant or add external qualification for automotive applications.
