Texas Instruments ADC12C105CISQ/NOPB

Overview

ADC12C105CISQ/NOPB from Texas Instruments is a 12-bit, 105 MSPS pipelined analog-to-digital converter with 1 GHz full-power bandwidth, internal 1.2 V reference, and single +3.0 V or +3.3 V supply operation. It features differential inputs (2 V_P-P full-scale), data-ready strobe (DRDY), and clock duty cycle stabilizer - deployed in high-IF sampling receivers and wireless base station front-ends.

For engineers reviewing the ADC12C105CISQ/NOPB datasheet, ADC12C105CISQ/NOPB pinout, ADC12C105CISQ/NOPB application, or ADC12C105CISQ/NOPB equivalent, key selection considerations include SNR (69 dBFS at 240 MHz), SFDR (82 dBFS), power-down mode (7.5 mW), WQFN-32 package thermal performance (θ_JA = 30°C/W), and pin-selectable output format (offset binary or 2's complement).

Technical Context

The ADC12C105CISQ/NOPB employs an 11-stage differential pipelined architecture with digital error correction and on-chip sample-and-hold, enabling 105 MSPS conversion while maintaining 12-bit no-missing-codes linearity. Its unique S/H stage delivers 1 GHz full-power bandwidth, supporting wideband RF digitization without external anti-aliasing complexity.

It integrates a stable 1.2 V bandgap reference (18 ppm/°C tempco) and supports external 1.2 V reference input; output drivers operate from a separate +2.5 V supply (VDR) to reduce noise coupling. The OF/DCS pin configures both data format and duty cycle stabilization, enabling flexible interface timing across diverse FPGA or ASIC receivers.

Key Specifications

Pinout & Package

The ADC12C105CISQ/NOPB is housed in a 32-pin WQFN package (5 mm × 5 mm × 0.8 mm, 0.5 mm pitch) with exposed thermal pad soldered to AGND for optimal thermal dissipation (θ_JA = 30°C/W). Pin functions are validated per TI SNAS417C Rev. April 2013.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed ADC applications.

Compared with ADS5463IPFP and AD9233BCPZ-105, the ADC12C105CISQ/NOPB uniquely combines parallel CMOS outputs, integrated 1.2 V reference, and 1 GHz bandwidth in a 5×5 mm WQFN package - making it optimal for cost-sensitive, thermally constrained, and layout-simple high-IF receiver designs.

Availability

ADC12C105CISQ/NOPB is available at Aetrix Electronics and suitable for high IF sampling receivers, wireless base station receivers, and test and measurement equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADC12C105CISQ/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-performance data converters for industrial, communications, and automotive markets.

The ADC12C105CISQ/NOPB belongs to TI's high-speed pipeline ADC product line, designed specifically for wideband communication receivers requiring high dynamic range, low latency, and simplified power/reference architecture.

FAQ

What is the maximum clock frequency supported by the ADC12C105CISQ/NOPB?

The ADC12C105CISQ/NOPB supports a maximum clock frequency of 105 MHz, as specified in its AC characteristics table. At this rate, it achieves full 12-bit performance with 69 dBFS SNR at 240 MHz input frequency. Operation below 20 MHz is not recommended due to increased aperture jitter and degraded dynamic performance.

Does the ADC12C105CISQ/NOPB require an external reference voltage?

No - the ADC12C105CISQ/NOPB includes an internal 1.2 V bandgap reference with 18 ppm/°C tempco, fully usable out-of-the-box. However, it also accepts an external 1.20 V ±2% reference applied to the VREF pin, which may be preferred in systems requiring tighter initial accuracy or lower drift than the internal reference provides.

How does the OF/DCS pin configure output data format and clock duty cycle stabilization?

The OF/DCS pin is a four-state analog control: tied to VA selects 2's complement without duty cycle stabilization; tied to AGND selects offset binary without stabilization; biased at (2/3)×VA enables 2's complement with stabilization; and (1/3)×VA enables offset binary with stabilization. This eliminates need for additional configuration pins or SPI registers.

What is the purpose of the separate VDR supply pin on the ADC12C105CISQ/NOPB?

VDR supplies only the digital output drivers (D0–D11 and DRDY), allowing them to operate from +2.4 V to VA independently of the analog supply (VA). This separation reduces digital switching noise coupling into the analog section, preserving SNR - especially critical in high-density mixed-signal PCBs where shared 3.3 V rails would degrade performance by 2–3 dB.

Can the ADC12C105CISQ/NOPB operate with a 2.5 V analog supply?

No - the ADC12C105CISQ/NOPB specifies an analog supply range of +2.7 V to +3.6 V per its Operating Ratings. Operation at 2.5 V violates the minimum VA requirement and risks degraded INL/DNL, increased missing-code probability, and failure to meet guaranteed SNR/SFDR specs. Always maintain VA ≥2.7 V for functional compliance.