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| aqlN/|--1/2q Weltrend Semiconductor, Inc. WT9101 Video Amplifier System with OSD & DACs Data Sheet Preliminary REV. 0.92 Feb, 5, 2002 The information in this document is subject to change without notice. (c)Weltrend Semiconductor, Inc. All Rights Reserved. *s |E i 3/4C u *~ e I u *~ F E o 24 2 1/4O 2F, No. 24, Industry E. 9 th RD., Science-Based Industrial Park, Hsin-Chu, Taiwan TEL:886-3-5780241 FAX:886-3-5794278.5770419 WT9101 Data Sheet Rev. 0.92 GENERAL DESCRIPTION The WT9101 pre-amp is an integrated CMOS CRT pre-amp. The IC is I2 C compatible, and allows control of all the parameters necessary to directly setup and adjust the gain and contrast in the CRT display. Brightness and bias can be controlled through the DAC outputs. Black level clamping of the signal is carried out directly on the AC coupled input signal into the high impedance preamplifier input, thus eliminating the need for the additional black level clamp capacitors. The IC is packaged in an industry standard 24-lead DIP molded plastic package. FEATURES * * * * * * 110 MHz bandwidth preamplifier with full video signal parametric control. I 2 C compatible interface to micro-controller. 4 external 8-bit DACs for bus controlled Bias and brightness. On Screen Display(OSD) mixing. Auto Beam current limiting. Suitable for use with discrete or integrated clamp, with software configurable brightness mixer. * Power Save (Green) Mode, 80% power reduction. BLOCK DIAGRAM and CONNECTION DIAGRAM To Other Video Channels R OSD 1 G OSD 2 B OSD 3 OSD Select 4 R Video 5 G Video 6 B Video 7 Analog GND 8 Vcc 9 V REXT REF 10 V SDA 11 SCL 12 Registers V REF DC DACs Offset Hi Z Input Auto Beam Buffer Amp Contrast Limit Amp OSD Mixer Gain Output Buffer Amp OSD Contrast Clamp DC Restore Amp H H Blank 24Flybac 23Clamp 22 ABL 21V OU V REF 20R Out 19G Out 18B Out Digital 17GND 16DAC1 15DAC2 I2C Interface 14DAC3 DACs 13DAC4 Weltrend Semiconductor, Inc. Page 2 WT9101 Data Sheet Rev. 0.92 PIN DESCRIPTION Pin No. 1 2 3 4 Pin Name Description Red OSD Input These inputs accept standard TTL or CMOS inputs. Each color is Green OSD Input either fully on (logic high) or fully off (logic low). Unused pins Blue OSD Input should be connected to ground with a 47k resistor. OSD Select This input accepts a standard TTL or CMOS input. H = OSD L = Video Connect to ground with a 47k resistor if not using OSD. Video inputs. These inputs must be AC coupled with a 0.047F cap. DC restoration is done at these inputs. A series resistor of about 33[ and external ESD protection diodes should also be used for ESD protection. Ground Pin for the analog circuits of the WT9101 Power supply pin for WT9101 Sets the internal current sources through a 10 k[ 1% external resistor. Resistor value and accuracy is critical for optimum operation of the WT9101 2 The I C data line. A pull-up resistor of about 2[ should be connected between this pin and +5V. A 300[ resistor should be connected in series with the data line for protection against arcing. 5 6 7 8 9 10 Red Video In Green Video In Blue Video In Analog Ground Vcc VREFREXT 11 SDA 12 SCL 13 14 15 16 17 18 19 20 21 DAC4 DAC3 DAC2 DAC1 Digital Ground Blue Video Out Green Video Out Red Video Out VREFOut The I2 C Clock line. A pull-up resistor of about 2k[ should be connected between this pin and +5V. A 300[ resistor should be connected in series with the clock line for protection against arcing. DAC outputs for cathode cut-off adjustments and brightness control. DAC 4 can be set to change the outputs of the other three DACs, acting as the brightness control. The DACS are set through the I2 C bus. Ground Pin for the digital circuits of the WT9101 Video outputs of the WT9101. The ideal driver for this part is CRT driver, which has the necessary gain of 26 dB or 20 V/V. A 0.1F capacitor must be placed close to this pin for decoupling the internal Vref. This pin may be used for an external voltage reference with proper buffering The Auto Beam Limit control reduces the gain of the video amplifier in response to a control voltage proportional to the CRT beam current. The ABL acts identically on all three channels. ABL is required for CRT life and X-ray protection 22 ABL Weltrend Semiconductor, Inc. Page 3 WT9101 Data Sheet Rev. 0.92 Pin No. 23 Pin Name Clamp Pulse Description This input accepts a standard TTL or CMOS input. A positive signal activates the clamp pulse for DC restoration of the video input. The AC coupling capacitors at the video inputs are used for holding the DC correction voltage, eliminating the need for additional capacitors H flyback is an analog signal input from the monitor horizontal scan. The WT9101 is able to generate an accurate blanking pulse in the video outputs from this input. The horizontal flyback from the monitor must be a clean signal, with no ringing or other noise on the signal 24 H Flyback Weltrend Semiconductor, Inc. Page 4 |
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