Analog Devices Inc. AD723ARUZ-REEL7

Overview

AD723ARUZ-REEL7 from Analog Devices is a 28-lead TSSOP RGB-to-NTSC/PAL video encoder IC that converts analog R/G/B inputs into composite (CV) and S-video (Y/C) outputs for TV display. It operates from 2.7 V to 5.5 V, delivers <100 mW typical power in composite mode, supports smart load detection via TVDET pin, and integrates active termination, Y-trap filtering, and 4FSC-synchronized encoding for both NTSC (14.318 MHz) and PAL (17.734 MHz) standards.

For engineers reviewing the AD723ARUZ-REEL7 datasheet, AD723ARUZ-REEL7 pinout, AD723ARUZ-REEL7 application, or AD723ARUZ-REEL7 equivalent, this page provides verified functional context, exact pin roles, real-world timing alignment specs (e.g., chroma/luma time alignment = 19 ns), load-detect behavior under CE-controlled sleep mode, and validated alternatives for embedded video output design.

Technical Context

The AD723ARUZ-REEL7 implements a predominantly analog signal path with digital timing control driven by an external 4FSC clock-14.318180 MHz for NTSC, 17.734475 MHz for PAL-and uses XNOR-combined HSYNC/VSYNC for sync separation. Its RGB-to-YUV matrix applies standard coefficients (Y = 0.299R + 0.587G + 0.114B; U = 0.493(B−Y); V = 0.877(R−Y)) with on-chip DC clamping synchronized to burst flag timing.

Luminance processing includes a 4-pole Bessel prefilter (8 MHz NTSC / 10 MHz PAL), 8FSC sampled delay line, and post-filter (7.5 MHz NTSC / 9 MHz PAL), achieving 4.7 MHz NTSC / 6.1 MHz PAL −3 dB bandwidth. Chrominance uses quadrature modulation at FSC (3.579545 MHz NTSC / 4.433618 MHz PAL), balanced modulators with per-line offset cancellation, and 6 MHz NTSC / 8 MHz PAL final filtering.

Key Specifications

Pinout & Package

AD723ARUZ-REEL7 is housed in a 28-lead TSSOP (RU-28) package with 0.65 mm pitch, exposed pad for thermal dissipation, and JEDEC MO-153 compliant footprint. Pin functions are validated per Analog Devices AD723 Rev. 0 datasheet Figure 2 and Pin Function Descriptions (pp. 4–5).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RGB-to-analog-video encoding applications.

Compared with ADV7170KSTZ and THS8135PFP, AD723ARUZ-REEL7 uniquely combines wide-supply operation (2.7–5.5 V), integrated TV presence detection, and switchable RGB termination - delivering lowest system-level component count and firmware dependency for portable and consumer video output.

Availability

AD723ARUZ-REEL7 is available at Aetrix Electronics and suitable for TV-out in laptops, digital cameras, set-top boxes, and video game consoles requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for AD723ARUZ-REEL7 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

Analog Devices is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and communications infrastructure.

The AD723ARUZ-REEL7 belongs to Analog Devices' video encoder product line, designed specifically for cost-sensitive, low-power embedded systems requiring seamless analog TV output without external support circuitry.

FAQ

What video standards does the AD723ARUZ-REEL7 support?

The AD723ARUZ-REEL7 supports both NTSC and PAL standards through hardware configuration: STND pin HIGH selects NTSC (14.318180 MHz 4FSC clock, 525-line timing), LOW selects PAL (17.734475 MHz 4FSC clock, 625-line timing). Burst amplitude, sync timing, and filter bandwidths are automatically adapted per standard without register programming.

How does the AD723ARUZ-REEL7 implement TV load detection?

The AD723ARUZ-REEL7 performs load detection by monitoring DC voltage levels at Y and CV outputs during vertical blanking intervals. When CE is HIGH, it checks once per 64 fields; when CE is pulsed HIGH in power-down mode, it uses a small test current on CV/CVSET or Y/YSET pins. Detection result appears on TVDET pin within 18 µs after sync pulse edge.

What is the purpose of the YTRAP pin on the AD723ARUZ-REEL7?

The YTRAP pin on the AD723ARUZ-REEL7 provides access to the luminance signal pre-filtering stage, allowing connection of an external series L-C resonant network tuned to 3.579545 MHz (NTSC) or 4.433618 MHz (PAL). This creates a notch filter that attenuates subcarrier-frequency energy in the Y path, eliminating cross-color artifacts visible as rainbow patterns on fine detail.

Can the AD723ARUZ-REEL7 operate from a 3.3 V supply?

Yes, the AD723ARUZ-REEL7 operates across 2.7 V to 5.5 V, making 3.3 V fully supported. At 3.3 V, it delivers <100 mW typical power in composite mode and maintains full specification compliance including 4.7 MHz NTSC bandwidth, 19 ns Y/C alignment, and TVDET functionality - verified in Analog Devices AD723 Rev. 0 datasheet Section "Specifications".

What termination configuration is recommended for the CV output of the AD723ARUZ-REEL7?

Analog Devices recommends active termination for the CV output of the AD723ARUZ-REEL7: connect a 300 Ω resistor between CVSET and ground, and route CV to a remote 75 Ω load. This configuration minimizes current draw versus standard shunt termination (150 Ω CVSET), achieves true 75 Ω output impedance up to 100 MHz, and eliminates need for series termination resistors on the PCB.