Connection/reference device
ADV7391/ADV7393 Low Power, Chip Scale, 16/8-Bit SD/HD Video Encoder
ADA4432-1 single-ended standard definition video filter amplifier with output short-circuit protection
ADA4433-1 differential SD video filter amplifier with output short-circuit protection
Evaluation and design support
Circuit evaluation board
CN-0264 Circuit Evaluation Board (EVAL-CN0264-EB1Z)
Design and integration files
Schematic, layout file, bill of materials
Circuit function and advantage
The circuit in Figure 1 shows a digital-to-analog video converter paired with a low-cost, low-power, fully integrated reconfigurable video filter with output short-circuit (STB) protection, ideal for use in harsh infotainment environments ( For example, in the automotive field, CVBS video is transmitted. Although many video encoders (video DACs), such as the ADV7391, can directly drive video loads, placing a video driver at the output of the video encoder is often beneficial for power-saving, filtering, line-drive, and overvoltage circuits. Protective function. Video drivers are typically configured as active filters (also known as reconstruction filters), and their primary use is in two ways: to prevent the introduction of high-frequency components of the video signal during sampling (above the Nyquist frequency); Drive the 75 Ω external cable that is connected to the video display.
Designers of infotainment and other video systems, such as rearview cameras and rear seat entertainment systems, tend to use such circuits to transmit video for the reasons described above. However, there is a third urgent design issue, namely robustness. The ADA4432-1 and ADA4433-1 provide analog video designers with integrated ICs with critical overvoltage protection, enhanced ESD tolerance, excellent video characteristics, low power consumption, and line diagnostics Features.
The ADA4432-1 and ADA4433-1 are fully integrated video reconstruction filters, single-ended and differential. Both provide an overvoltage protection (STB protection) of up to 18 V at the output, while also featuring low power consumption and line diagnostics. The line diagnostics function is provided by a logic output that can be activated in the event of a fault condition. The ADA4432-1 and ADA4433-1 have a high-order filter built in. The 3 dB cutoff frequency is 10 MHz and provides 45 dB rejection at 27 MHz.
With STB protection and robust ESD tolerance, the ADA4432-1 and ADA4433-1 provide superior protection in harsh environments.
The ADV7391 and ADA4432-1 are fully compliant with automotive applications and are ideal for infotainment systems and visual security systems in automotive applications. The ADV7391, ADA4432-1, and ADA4433-1 are available in very small LFCSP packages for small space applications.
Circuit description
The ADV7391 is a low power, fully integrated digital video encoder that converts digital 8-bit component video data from CMOS imaging devices into standard analog baseband video signals that are compatible with global standards. Three 10-digit analog-to-air video converters (operating with VAA = 2.6 V to 3.46 V) support composite (CVBS), S-video (YC) or component (YPrPb/RGB) in standard definition (SD) or high definition (HD) video formats Analog output. The circuit in Figure 1 is configured to provide low output drive only through DAC1. To further reduce power consumption, other DACs and phase-locked loops (PLLs) are turned off. The low drive mode is defined as a 4.33 mA full-scale output current. The ADV7391 contains a RSET pin. A resistor is connected between the RSET pin and AGND to control the full-scale output current. For low drive operation, RSET must be equal to 4.12 kΩ and RL must be equal to 300 Ω. The resistor connected to the RSET pin must have a 1% tolerance.
The ADV7391 includes an on-chip PLL that allows oversampling of video data. As shown in Figure 1, the PLL is disabled (subaddress 0x00, Bit 1 = 1), providing twice the SD oversampling rate. In the case of PLL disable, the external loop filter components are removed to save space and cost.
The ADA4432-1 can be used as a pseudo differential (single-ended) driver with an unbalanced transmission line. The pseudo differential mode uses one conductor to carry the unbalanced data signal transmitted from the driver to the receiver, and the other conductor acts as a ground reference signal.
The positive conductor connects the ADA4432-1 output to the positive input of the differential receiver. A negative or ground conductor from the source circuit is connected to the negative input of the receiver. The output termination resistor of the ADA4432-1 should match the impedance of the receiver input termination resistor. For example, in a 75 Ω system, each output of the ADA4432-1 is terminated with a 75 Ω resistor at the rear, which is connected to a 75 Ω resistor at the receiver.
In Figure 1, the ADA4432-1 is configured as a single-ended to single-ended driver, allowing unbalanced transmission using twisted pair, non-twisted pair, or coaxial cable.
Low power considerations
Significant power savings can be achieved with the ADA4432-1 or ADA4433-1 and series source and parallel load terminations at low supply voltages compared to direct drive video cables through the DAC output. Figure 2 shows the video DAC of the direct drive cable. A properly terminated DAC drive transmission line requires two 75 Ω loads in parallel and requires more than 33 mA to achieve a 1.3 V full-scale voltage level. Figure 3 shows the case of driving the same video load with the ADA4432-1 and series-parallel termination. This requires twice the output voltage to drive a 150 Ω equivalent, but only a little more than 15 mA is needed to achieve full-scale output. When using the same supply voltage as the DAC, this saves up to 74% compared to the circuit in Figure 2. The high-order filtering provided by the ADA4432-1 reduces DAC oversampling rate requirements, further reducing power consumption. The main source of power savings in the configuration shown in Figure 3 is the low drive mode setting of the ADV7391. Combined with oversampling requirements (PLL off) and reduced load current requirements, this mode can significantly reduce power consumption.
See the ADV7391 data sheet for details on the low drive mode.
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