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OPA698 Datasheet(PDF) 20 Page - Texas Instruments |
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OPA698 Datasheet(HTML) 20 Page - Texas Instruments |
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20 / 27 page  OPA698 20 SBOS258B www.ti.com OPA698 V L V H Open Open V L V H V OUT R 3 402 Ω R 4 75 Ω OPA698 R 1 75 Ω R 2 402 Ω V IN –0.2V FIGURE 19. Sync Stripper Circuit. BOARD LITERATURE PRODUCT PACKAGE PART NO. REQUEST NO. OPA698ID SO-8 DEM-OPA68xU SBOU009 TABLE I. Demo Board Summary Information. DC RESTORER Figure 18 shows a DC restore circuit using the OPA698 and OPA660. The buffer element of the OPA660 is used to buffer the input signal while the transconductance element is used to restore the DC level after the decoupling capacitor C1. The DC level is set using R1 and R2. The OPA698 is configured at a gain of 2 to compensate for the 75 Ω series into a 75Ω load. The OPA698 also limits the output to ground. VIDEO SYNC STRIPPER Figure 19 shows a sync stripper using two OPA698 output- limiting op amps. One OPA698 is configured as a limiting inverting comparator. Referred to the input, the negative excursions lower than –0.2V are clipped to ground, and all excursions greater than –0.2V generate an output voltage set by the default limiting value (–3.5V). The second OPA698 is using this waveform to effectively remove the sync pulse from the video signal. DESIGN-IN TOOLS APPLICATIONS SUPPORT The Texas Instruments Applications Department is available for design assistance at 1-972-644-5580. The Texas Instru- ments web site (www.ti.com) has the latest product data sheets and other design aids. DEMONSTRATION BOARDS A PC board is available to assist in the initial evaluation of circuit performance of the OPA698ID. It is available as an unpopulated PCB with descriptive documentation. See the demonstration board literature for more information. The summary information for this board is shown in Table I. FIGURE 18. DC Restore to Ground. This board can be requested through the TI web site. OPERATING SUGGESTIONS THEORY OF OPERATION The OPA698 is a voltage-feedback op amp that is unity-gain stable. The output voltage is limited to a range set by the voltage on the limiter pins (5 and 8). When the input tries to overdrive the output, the limiters take control of the output buffer. This action from the limiters avoids saturating any part of the signal path, giving quick overdrive recovery and OPA698 V O 75 Ω Load 8 5 V L V H = Open 402 Ω R 2 1k Ω R 3 200 Ω D 1 402 Ω 20 Ω V IN 200 Ω 75 Ω R Q 250 Ω R 1 19.6k Ω D 2 C 1 20 µF 6 1 C E B3 CCII 2 U1 5 +1 U1 U1 = OPA660 R Q = 250Ω (sets IQ for U1) D 1, D2 = 1N4148 |
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