ADC14C105CISQ - 14-Bit 105MSPS 1GHz ADC | Texas Instruments
MPN: ADC14C105CISQ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $38.5 | $38.50 |
| 10 | $34.65 | $346.50 |
| 100 | $30.8 | $3,080.00 |
| 500 | $27.5 | $13,750.00 |
| 1,000 | $24.2 | $24,200.00 |
ADC14C105CISQ Overview
An analog-to-digital converter (ADC) is a data conversion IC that transforms a continuous analog input voltage into a discrete digital code. The ADC14C105 belongs to the high-speed pipeline ADC sub-category, sitting within the data converter hierarchy of signal chain ICs, which itself falls under the broader class of analog mixed-signal semiconductors. Pipeline ADCs are the workhorse of communications, test-and-measurement, and imaging systems where sample rates between 10 MSPS and 250 MSPS are required at moderate resolution (10-16 bits).
Key specifications include 14-bit resolution, 105 MSPS maximum sample rate, 1.0 GHz full-power input bandwidth, internal 1.2V reference, and a power-down mode for low-power standby. The 32-WQFN package with exposed thermal pad provides low thermal resistance for high-density layouts. The LVDS/CMOS-selectable digital interface and the clock duty-cycle stabilizer allow the part to maintain SNR performance even with degraded clock sources, which is critical when the ADC is fed from a noisy FPGA or serializer.
The ADC14C105 uses a pipelined multi-stage architecture with digital error correction, providing excellent linearity (typically ±0.5 LSB INL/DNL) and spurious-free dynamic range suited to demanding IF-sampling applications. The wide input bandwidth enables direct IF sampling of intermediate-frequency signals up to several hundred MHz, eliminating downconversion stages in radio architectures.
Typical applications include software-defined radio (SDR), digital oscilloscopes, medical imaging ultrasound receivers, communications base-station IF chains, and high-speed data acquisition. The part is qualified for the industrial temperature range (-40C to +85C), making it suitable for non-automotive industrial and instrumentation systems.
When designing with the ADC14C105, follow the input-drive network recommended in the datasheet (typically a differential transformer or fully-differential amplifier such as the LMH6554) to preserve the 1 GHz input bandwidth. A 1.0 uF decoupling capacitor placed within 5 mm of each power pin is essential, and the exposed thermal pad must be soldered to a continuous ground plane for thermal dissipation.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single reference for the ADC14C105CISQ's positioning within TI's high-speed ADC portfolio.
Drop-in alternatives for ADC14C105CISQ — 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 ADC14C105CISQ (same form factor and footprint) — differing in Package, Resolution, Architecture, Operating Temperature, Data Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC12C105CISQ
✅ Drop-In✓ In Stock
$9.05 / Unit
View Datasheet →ADC14C105CISQE/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC14C105CISQ/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
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 →AD9645BCPZ-80
✅ Drop-In📋 Reference alternative (not in catalog)
ADC14C105CISQ Maximum Ratings & Electrical Characteristics
| Resolution | 14 bit |
| Number of Channels | 1 |
| Sample Rate | 105 MSPS |
| Input Bandwidth (Full Power) | 1.0 GHz |
| Architecture | Pipelined |
| Analog Supply Voltage | 3.0 V or 3.3 V |
| Digital Supply Voltage | 1.8 V to 3.3 V |
| Analog Input Type | Differential |
| Input Voltage Range | 1.6 V max (differential) |
| Reference Type | Internal |
| Reference Voltage | 1.2 V (internal) |
| Data Interface | LVDS / Parallel CMOS |
| Linearity Error (INL) | 0.0244 % (typ) |
| Operating Temperature | -40 C to +85 C |
| Package | 32-WQFN (5x5 mm) with exposed thermal pad |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
ADC14C105CISQ Pin Configuration
| Pin 1 | AVDD — Analog supply voltage (3.0V or 3.3V) |
| Pin 2 | AGND — Analog ground |
| Pin 3 | IN+ — Differential analog input positive |
| Pin 4 | IN- — Differential analog input negative |
| Pin 5 | VCM — Common-mode voltage output (typically 1.5V) |
| Pin 6 | VBG — Bandgap reference output (decouple to ground) |
| Pin 7 | REXT — External reference resistor (sets internal bias) |
| Pin 8 | AGND — Analog ground |
| Pin 9 | AVDD — Analog supply voltage |
| Pin 10 | PD — Power-down input (active high) |
| Pin 11 | DFS — Digital output format select (LVDS/CMOS) |
| Pin 12 | DRVDD — Digital output driver supply |
| Pin 13 | DRGND — Digital output driver ground |
| Pin 14 | D0 — Data output bit 0 (LSB) |
| Pin 15 | D1 — Data output bit 1 |
| Pin 16 | D2 — Data output bit 2 |
| Pin 17 | D3 — Data output bit 3 |
| Pin 18 | D4 — Data output bit 4 |
| Pin 19 | D5 — Data output bit 5 |
| Pin 20 | D6 — Data output bit 6 |
| Pin 21 | D7 — Data output bit 7 |
| Pin 22 | D8 — Data output bit 8 |
| Pin 23 | D9 — Data output bit 9 |
| Pin 24 | D10 — Data output bit 10 |
| Pin 25 | D11 — Data output bit 11 |
| Pin 26 | D12 — Data output bit 12 |
| Pin 27 | D13 — Data output bit 13 (MSB) |
| Pin 28 | DRDY — Data ready output clock |
| Pin 29 | OFC — Offset correction input |
| Pin 30 | CLK+ — Differential clock input positive |
| Pin 31 | CLK- — Differential clock input negative |
| Pin 32 | DRVDD — Digital output driver supply |
Typical Applications
ADC14C105CISQ is suitable for 7 applications: Software-Defined Radio (SDR) Receivers, Digital Oscilloscope Front-End, Medical Ultrasound Imaging Receiver, Communications Base-Station IF Sampling, High-Speed Data Acquisition Systems, Radar and Lidar Signal Processing, Industrial Process Control Instrumentation.
Software-Defined Radio (SDR) Receivers
The ADC14C105CISQ is well-suited for software-defined radio (SDR) receiver front-ends where 14-bit resolution at 105 MSPS captures wide-bandwidth signals with 73 dBFS SNR. Its 1.0 GHz full-power input bandwidth allows direct IF-sampling of intermediate-frequency signals in the 70-300 MHz range, eliminating analog downconversion mixers. In an SDR design, the ADC is fed from a differential transformer (such as Mini-Circuits ADT1-1WT) or a fully-differential amplifier (LMH6554), with the digital outputs routed to an FPGA for digital downconversion. The clock duty-cycle stabilizer maintains SNR performance even with non-50% clock duty cycle, which is typical of FPGA-generated clocks.
Recommended
Digital Oscilloscope Front-End
In a 4-channel 1 GHz digital oscilloscope, the ADC14C105CISQ serves as the analog-to-digital front-end per channel, digitizing 100 MHz full-scale signals with 14-bit resolution. The 1.0 GHz input bandwidth provides comfortable Nyquist margin for real-time bandwidth measurements up to 350 MHz, and the internal sample-and-hold eliminates the need for an external track-and-hold. The 32-WQFN package allows four ADCs plus their driver amplifiers to fit in a 50x80 mm area, while the LVDS digital interface streams data into an FPGA for triggering, measurement, and display. Power-down mode reduces idle channel consumption below 5 mW, critical for battery-powered portable oscilloscopes.
Recommended
Medical Ultrasound Imaging Receiver
In medical ultrasound beamformer designs, the ADC14C105CISQ digitizes the received echo signal at 105 MSPS with 14-bit resolution, providing 73 dBFS dynamic range sufficient to resolve tissue reflections at 15-20 cm depth. Its 1.0 GHz input bandwidth captures the full 30 MHz transducer bandwidth without aliasing. Each ultrasound channel uses one ADC per element, so 32- or 64-channel systems employ 32-64 ADC14C105 parts in parallel, with the LVDS digital outputs summed by an FPGA beamformer. The 32-WQFN package with exposed thermal pad allows direct PCB mounting for high-density channel arrays, and the -40C to +85C industrial temperature range accommodates hospital and portable scanner environments.
Recommended
Communications Base-Station IF Sampling
In a 4G LTE or 5G NR base-station receiver, the ADC14C105CISQ digitizes the IF signal at 105 MSPS with 14-bit resolution, providing the 70+ dB dynamic range needed for multi-carrier reception. Its 1.0 GHz full-power input bandwidth allows direct sampling of the 184.32 MHz LTE IF, eliminating analog downconversion stages and reducing BOM cost. The LVDS interface connects directly to an FPGA digital downconverter (DDC) and Crest Factor Reduction (CFR) block. Multiple ADC14C105CISQ parts can be synchronized for MIMO or carrier aggregation. The internal 1.2V reference eliminates the need for an external reference IC, simplifying the base-station RF frontend.
Recommended
High-Speed Data Acquisition Systems
In high-speed multi-channel data acquisition (DAQ) cards for instrumentation, the ADC14C105CISQ captures 14-bit samples at 105 MSPS for transient recorders, vibration analyzers, or radar receivers. The 1.0 GHz input bandwidth supports 50 MHz full-power signals with comfortable Nyquist margin, and the pipelined architecture provides deterministic latency. The CMOS/LVDS-selectable digital interface allows a 16-bit bus width or serialized LVDS output for FPGA-based processing. The 32-WQFN package with exposed thermal pad allows compact 2-layer PCB layouts with proper ground-plane stitching. The 1.0 uF decoupling capacitor and the differential input transformer network should follow TI's reference design recommendations to preserve ENOB.
Recommended
Radar and Lidar Signal Processing
In automotive short-range radar and industrial lidar receivers, the ADC14C105CISQ digitizes the down-converted IF signal at 105 MSPS with 14-bit resolution. Its 1.0 GHz full-power input bandwidth supports the 80-200 MHz IF range typical of FMCW radar and pulsed lidar, and the 73 dBFS SNR preserves the dynamic range needed for target identification at 100+ meters. The pipelined architecture with digital error correction provides the linearity (typically ±0.5 LSB INL/DNL) required for high-contrast target discrimination. For multi-channel systems, multiple ADC14C105CISQ parts can be synchronized using a common LVDS clock, with LVDS digital outputs aggregated in an FPGA for FFT-based signal processing.
Recommended
Industrial Process Control Instrumentation
In industrial process control instrumentation such as vibration analyzers, high-speed transient recorders, or power-quality monitors, the ADC14C105CISQ provides 14-bit precision at 105 MSPS for real-time waveform capture. The 1.0 GHz full-power input bandwidth captures fast transients and switching-converter ripple waveforms, and the internal 1.2V reference eliminates the need for an external reference IC, reducing BOM cost. The -40C to +85C industrial temperature range ensures reliable operation in factory environments. The exposed thermal pad provides low thermal resistance (typically 30 C/W theta-JA on a 4-layer JEDEC board), allowing continuous operation at 105 MSPS in sealed industrial enclosures without active cooling.
Recommended
Recommended Products Summary
Engineering reference data for ADC14C105CISQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC12C105CISQ | ADC14C105CISQE/NOPB | ADC14C105CISQ/NOPB | ADC14DS105CISQE/NOPB | AD9645BCPZ-80 |
|---|---|---|---|---|---|---|
| Package | 32-WQFN (5x5 mm) | 32-WQFN (5x5 mm) - same | 32-WQFN (5x5 mm) - same | 32-WQFN (5x5 mm) - same | 32-WQFN (5x5 mm) - same | 32-LFCSP (5x5 mm) - close |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Resolution | 14 bit | 12 bit | 14 bit | 14 bit | 14 bit | 14 bit |
| Sample Rate | 105 MSPS | 105 MSPS | 105 MSPS | 105 MSPS | 105 MSPS (per channel, dual) | 80/105 MSPS |
| Number of Channels | 1 | 1 | 1 | 1 | 2 | 1 |
| Input Bandwidth | 1.0 GHz | 1.0 GHz | 1.0 GHz | 1.0 GHz | 1.0 GHz | 650 MHz |
| Analog Supply | 3.0V or 3.3V | 3.0V or 3.3V | 3.0V or 3.3V | 3.0V or 3.3V | 3.0V or 3.3V | 1.8V |
| Data Interface | LVDS / Parallel CMOS | LVDS / Parallel CMOS | LVDS / Parallel CMOS | LVDS / Parallel CMOS | LVDS / Parallel CMOS | LVDS / CMOS |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Single-channel 14-bit precision in the TI PowerWise family (vs ADC12C105CISQ)
- Wide 1.0 GHz full-power input bandwidth (vs AD9645BCPZ-80 (Analog Devices))
- Dual-channel upgrade path in same 32-WQFN footprint (vs ADC14DS105CISQE/NOPB)
Design Notes
Estimated: The ADC14C105CISQ's 1 GHz input bandwidth makes it very sensitive to PCB layout. Place input traces with 50 ohm controlled impedance and 100 ohm differential pairs for IN+/IN- and CLK+/CLK- routes. Use a 4-layer PCB with a dedicated ground plane directly under the WQFN thermal pad. Keep analog input traces away from digital output traces and clock traces by at least 5 mm to avoid digital-to-analog coupling. Source: TI WQFN layout application guidance.
Decouple each AVDD and DRVDD pin with a 1.0 uF ceramic capacitor placed within 5 mm of the pin, plus a 0.1 uF high-frequency bypass capacitor. Add a 10 uF bulk capacitor on each supply rail near the IC. Use ferrite beads (600-1000 ohm at 100 MHz) to isolate AVDD from the digital supply rails, as the input clock and digital outputs can inject high-frequency noise into the analog supply. Source: TI ADC14C105 datasheet decoupling recommendations.
Drive the ADC inputs through a fully-differential amplifier (such as the LMH6554) or a 1:1 input transformer (such as Mini-Circuits ADT1-1WT) to maintain the 1 GHz input bandwidth. A single-ended input directly to IN+ or IN- will degrade SFDR and may cause -3 dB bandwidth loss. Drive the CLK+/CLK- differential inputs with a low-jitter clock source (RMS jitter < 1 ps) to preserve the SNR at 105 MSPS. Source: TI ADC14C105 input drive network application note.
Estimated: The ADC14C105CISQ's 32-WQFN package has a typical theta-JA of 30-35 C/W on a 4-layer JEDEC board (JESD51-7). At full 105 MSPS operation with both AVDD and DRVDD loaded, total power consumption is approximately 300-350 mW, resulting in a junction temperature rise of 9-12 C above ambient. The exposed thermal pad must be soldered to a continuous 5x5 mm copper pour with 9 thermal vias for proper heat dissipation. Source: TI WQFN package thermal guidance.
Do not exceed the 1.6 V maximum differential analog input voltage (per Partstack listing of the ADC14C105CISQ datasheet). Apply input signals through the recommended transformer or differential amplifier to maintain the input common-mode voltage near VCM (typically 1.5V). Avoid hot-plugging the ADC into a live supply - the input protection diodes can latch up. Do not apply LVDS clock to a CMOS-mode part, or CMOS clock to an LVDS-mode part; the DFS pin state must match the output format. Source: TI ADC14C105 datasheet.
Compliance Information
RoHS compliant per TI product page. The /NOPB finish variant explicitly documents lead-free status. Not AEC-Q100 qualified - the ADC14C105CISQ is industrial temperature grade (-40C to +85C), not automotive. Halogen-free status not explicitly stated in available data.
