Texas Instruments ADC1175-50CIMTX

Overview

ADC1175-50 from Texas Instruments is an 8-bit, 50 MSPS analog-to-digital converter with internal track-and-hold, single +5V operation, 125 mW typical power consumption, and 6.8 effective bits at 25 MHz input frequency. It digitizes video and imaging signals in portable CCD systems requiring low-power, high-speed sampling with industry-standard pinout.

For engineers reviewing the ADC1175-50 datasheet, ADC1175-50 pinout, ADC1175-50 application, or ADC1175-50 equivalent, key selection considerations include its 7 pF input capacitance, 10 ps rms aperture jitter, power-down mode (<5 mW), straight binary output format, and dual TSSOP/WQFN package support for space-constrained imaging front-ends.

Technical Context

The ADC1175-50 employs a flash-based architecture with integrated track-and-hold, achieving 6.8 ENOB at 50 MHz clock and 25 MHz sine-wave input. Its reference ladder accepts externally defined VRT (1.0–5.0 V) and VRB (0–4.0 V) to set the 1.0–2.8 V conversion range, enabling flexible full-scale adjustment.

Digital outputs D0–D7 are CMOS/TTL-compatible, tri-stated during power-down (PD pin high), and valid 2.5 clock cycles plus 14 ns after CLK rising edge. Sampling occurs on CLK falling edge; pipeline latency is fixed at 2.5 cycles, with aperture jitter specified at 10 ps rms for timing-critical video digitization.

Key Specifications

Pinout & Package

ADC1175-50 is available in 24-pin TSSOP (PW) and 24-pin WQFN (NHW0024B) packages. Both share identical pin functions and electrical behavior; WQFN offers lower thermal resistance (θ_JA = 40°C/W vs. 92°C/W for TSSOP).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit, 50 MSPS analog-to-digital converter applications.

Compared with MAX1180BCUI+ and AD9280ARSZ, ADC1175-50 uniquely delivers 50 MSPS operation on +5V with self-biasable references and <5 mW power-down-making it the only option meeting all three requirements for portable high-speed imaging front-ends.

Availability

ADC1175-50 is available at Aetrix Electronics and suitable for digital still cameras, CCD imaging systems, electro-optic targeting pods, and broadcast video digitization equipment requiring stable component supply across extended commercial temperature ranges.

Supply support for ADC1175-50 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.

ADC1175-50 belongs to TI's precision high-speed ADC product line, designed specifically for low-power, portable video and imaging applications where 8-bit resolution, 50 MSPS throughput, and +5V simplicity are mandatory.

FAQ

What is the maximum input frequency supported by ADC1175-50 while maintaining specified AC performance?

The ADC1175-50 achieves 6.8 effective bits at 25 MHz input frequency with 50 MHz clock. Full-power bandwidth is 120 MHz, but AC specs such as SINAD and ENOB degrade above 25 MHz input under standard test conditions (VRT = 2.6 V, VRB = 0.6 V). For guaranteed 6.1-bit ENOB minimum, input must stay ≤24.9 MHz per the Electrical Characteristics table. ADC1175-50 is optimized for video-bandwidth applications-not RF sampling.

Does ADC1175-50 require external reference components, or can it operate with internal biasing?

ADC1175-50 supports both modes: connecting VRT to VRTS and VRB to VRBS enables self-biased reference voltages of ~2.6 V and ~0.6 V respectively, eliminating external resistors. However, for highest linearity (e.g., <±0.8 LSB INL), TI recommends driving VRT/VRB with low-impedance sources-as shown in Figure 19 of the datasheet-since internal biasing yields ±1.95 LSB INL max over temperature. ADC1175-50's internal resistors provide rapid prototyping capability but not metrology-grade accuracy.

What is the recommended power supply decoupling scheme for ADC1175-50?

TI specifies separate 10 µF tantalum + 0.1 µF ceramic capacitors per AVDD and DVDD pin pair, placed within 2.5 cm of the package. AVDD and DVDD must share a clean +5V source but be isolated using a wideband choke (e.g., JW Miller FB20010-3B) or ≤10 Ω resistor. AVSS and DVSS grounds must connect near the ADC1175-50 package with minimal trace length; ground separation must remain ≤100 mV. This prevents digital switching noise from corrupting analog conversion integrity in ADC1175-50.

How does the power-down mode affect digital output behavior and wake-up timing of ADC1175-50?

When PD pin is driven high, ADC1175-50 enters power-down mode consuming <5 mW and placing D0–D7 outputs in high-impedance TRI-STATE. Data becomes invalid within 140 ns of PD assertion. Upon returning PD low, the device resumes normal operation after 140 ns (t_EN), with first valid output appearing 2.5 clock cycles + t_OD after the next CLK rising edge. No re-initialization or reset sequence is required-ADC1175-50 maintains internal state and resumes sampling seamlessly.

Can ADC1175-50 interface directly with FPGA I/O banks configured for 3.3V LVTTL?

No-ADC1175-50 outputs are CMOS/TTL compatible with VOH ≥ 4.0 V (at DVDD = 4.75 V) and VOL ≤ 0.4 V, requiring +5V-tolerant or mixed-voltage FPGA I/O banks. Direct connection to 3.3V-only LVTTL inputs risks overvoltage damage or logic misreads. TI recommends level-shifting (e.g., SN74LVC4245A) or using FPGAs with 5V-tolerant inputs. The ADC1175-50 itself operates only on +5V supplies; no 3.3V IO support is provided in its specification or pinout.