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MAX7428 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX7428 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 21 page D/A D/A 0.1 µF 0.1 µF INA INB GND ENCODER 75 Ω 75 Ω 75 Ω **220 µF 75 Ω C1 300k Ω SERIAL I/O SYNC PULSE IN OR OUT OUT VCC 5V REXT DATA SYNCIO **220 µF *1M Ω *1M Ω MAX7428 Z0 = 75 Ω Z0 = 75 Ω 5V 10k Ω *** C1 = 1nF TO 1 µF (SEE TABLE 3) *NEEDED ONLY IN FILTER BYPASS MODE **OPTIONAL CAPACITOR ***ONLY ONE PULLUP RESISTOR NEEDED PER BUS Figure 1. MAX7428 Typical Application Circuit Detailed Description The MAX7428/MAX7430/MAX7432 filter and buffer the outputs of DAC encoder chipsets that process digital video information in applications such as set-top boxes, hard-disk recorders, DVD players, recorders, and digi- tal VCRs. These devices also filter and “clean-up” ana- log video signals. Each channel in the MAX7428/ MAX7430/MAX7432 includes an input mux to select the input channel, a 6th-order Sallen-Key filter with four adjustable high-frequency boost levels, an output buffer with a 6dB gain, a sync detector and clamp, and an external resistor to set internal bias levels. Output disable adds additional multiplexing in a wired-OR con- figuration. Filter bypass, in conjunction with the two inputs, can be used to provide filtered and unfiltered video signal processing. Maxim’s Single Pin Bus (MSPB) interface controls all of the above features. An external capacitor is used to assign each device a unique address that allows control of up to 16 devices on the same bus. Typical application circuits for the MAX7428/MAX7430/MAX7432 are shown in Figures 1, 2, and 3. Input Considerations Use a 0.1µF ceramic capacitor to AC-couple the input to the MAX7428/MAX7430/MAX7432. This input capaci- tor stores a DC level to level-shift the input signal to an optimal point between VCC and GND. The ABSEL bit on the Control Register sets which channel (IN_A or IN_B) is selected (Control Register section). The IN_A and IN_B inputs have a typical input resistance of 50k Ω. Standard Definition Video Reconstruction Filters and Buffers 6 _______________________________________________________________________________________ Pin Description (continued) PIN MAX7432 MAX7430 MAX7428 NAME FUNCTION 13 9 — OUT1 Buffer Output 1 14 10 2 VCC +5V Supply Voltage —— 1 INA Video Input A. Use a 0.1µF series input capacitor for proper operation. —— 3 INB Video Input B. Use a 0.1µF series input capacitor for proper operation. —— 5 SYNCIO Sync Pulse Input or Output —— 8 OUT Buffer Output |
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