Texas Instruments ADC08351CIMTCX/NOPB

Overview

ADC08351CIMTCX/NOPB from Texas Instruments is an 8-bit, 42 MSPS analog-to-digital converter optimized for video and imaging systems operating on a single +3V supply. It delivers 7.2 effective bits at 4.4 MHz input with 42 MHz clock, features internal sample-and-hold, TRI-STATE outputs, and power-down mode consuming <7 mW - enabling portable digital camcorders and medical imaging front-ends.

For engineers reviewing the ADC08351CIMTCX/NOPB datasheet, ADC08351CIMTCX/NOPB pinout, ADC08351CIMTCX/NOPB application, or ADC08351CIMTCX/NOPB equivalent, key selection criteria include ENOB vs. input frequency trade-offs, analog input capacitance switching (4 pF/11 pF), VREF biasing requirements, and TSSOP-20/WQFN-24 package compatibility in high-speed layout-sensitive designs.

Technical Context

The ADC08351CIMTCX/NOPB employs a pipelined architecture with 2.5-clock-cycle latency and sampling triggered on the falling edge of CLK. Its internal reference ladder sets full-scale range at 0.7468 × VREF, with zero-scale at 0.0665 × VREF - defining a usable 0.5–0.68 VA input range and ensuring no missing codes across temperature.

It integrates self-biasing (18 kΩ pull-up to VREF, 12 kΩ pull-down to AGND) for AC/DC-coupled inputs and requires separate bypassing of VA and VD with 10 µF + 0.1 µF capacitors. Digital outputs are CMOS/TTL-compatible, enabled by OE and tri-stated during PD = high or OE = high.

Key Specifications

Pinout & Package

ADC08351CIMTCX/NOPB is packaged in a 20-pin TSSOP (thin shrink small outline package) with exposed pad option per TI's SNAS026E datasheet. Pin numbering follows standard top-view orientation; AGND/DGND pins are assigned to minimize ground bounce in mixed-signal layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit, 40+ MSPS analog-to-digital converter applications.

Compared with ADS7822U and MAX1186EEE+, ADC08351CIMTCX/NOPB provides optimal balance of speed, integrated biasing, and power efficiency for video and portable imaging - eliminating external reference and S/H components while maintaining 7.2 ENOB at 42 MSPS, unlike the slower SAR or less-integrated alternatives.

Availability

ADC08351CIMTCX/NOPB is available at Aetrix Electronics and suitable for video digitization, digital still cameras, and medical imaging applications requiring stable component supply, long-term manufacturability, and industrial temperature support (−40°C to +85°C).

Supply support for ADC08351CIMTCX/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, automotive, and communications markets.

ADC08351CIMTCX/NOPB belongs to TI's legacy high-speed ADC portfolio designed specifically for cost-sensitive, low-power video and imaging front-ends where integration, single-supply operation, and guaranteed no-missing-codes performance are critical.

FAQ

What is the maximum input frequency the ADC08351CIMTCX/NOPB can accurately digitize?

The ADC08351CIMTCX/NOPB has a full-power bandwidth of 120 MHz, meaning it maintains full-scale accuracy up to that frequency. However, effective resolution drops with increasing input frequency: ENOB is 7.2 bits at 4.4 MHz input and 6.8 bits at 21 MHz input under 42 MHz clock conditions. For optimal video fidelity, keep f_IN ≤ 21 MHz.

Does the ADC08351CIMTCX/NOPB require an external reference voltage?

Yes, the ADC08351CIMTCX/NOPB requires an external reference voltage applied to VREF (Pin 14), which must be between 0.75 V and VA (typically +3 V). The internal resistor ladder scales full-scale input to 0.7468 × VREF, so reference stability directly impacts gain accuracy and ENOB performance.

How does the power-down mode affect the ADC08351CIMTCX/NOPB's output behavior?

When PD (Pin 15) is driven high, the ADC08351CIMTCX/NOPB enters power-down mode, reducing total current to <1 mA and total power to <7 mW. In this state, conversion halts, and all digital outputs enter high-impedance regardless of OE state - ensuring no bus contention during sleep.

What is the significance of the dual input capacitance specification (4 pF / 11 pF) for the ADC08351CIMTCX/NOPB?

The ADC08351CIMTCX/NOPB exhibits clock-dependent input capacitance: 4 pF when CLK is low and 11 pF when CLK is high. This dynamic loading demands a driver amplifier capable of stable operation across both states - inadequate drive strength causes aperture uncertainty, increased THD, and degraded SFDR, especially above 10 MHz.

Can the ADC08351CIMTCX/NOPB interface directly to a 3.3V FPGA without level-shifting?

Yes - the ADC08351CIMTCX/NOPB's digital outputs are CMOS/TTL-compatible with VOH ≥ 2.65 V and VOL ≤ 0.2 V at VD = 2.7 V, meeting 3.3V logic thresholds. However, VD must be supplied at +3.0 V ±0.3 V (operating range +2.7V to +3.6V), and OE must be actively controlled to avoid floating outputs.