CXD1178Q Sony, CXD1178Q Datasheet
CXD1178Q
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CXD1178Q Summary of contents
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... RGB 3-channel D/A Converter Description The CXD1178Q is an 8-bit high-speed D/A converter for video band use. It has an input/output equivalent to 3 channels and suitable for use of digital TV, graphic display, and others. Features • Resolution 8-bit • Maximum conversion speed 40MSPS • ...
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... LATCHES CURRENT CELLS CLOCK GENERATOR 2LSB’S CURRENT CELLS 6MSB’S LATCHES CURRENT CELLS CLOCK GENERATOR 2LSB’S CURRENT CELLS 6MSB’S LATCHES CURRENT CELLS CLOCK GENERATOR CURRENT CELLS (FOR FULL SCALE) BIAS VOLTAGE GENERATOR —2— CXD1178Q RCK ...
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... Equivalent circuit —3— Description Digital input R0 (LSB (MSB) G0 (LSB (MSB) B0 (LSB (MSB) Blanking input. This is synchronized with the clock input signal for each channel. No signal at “H” (Output 0 V). Output condition at “L”. Connect a capacitor of about 0.1 µF. CXD1178Q ...
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... —4— CXD1178Q Description Clock input. Digital GND Analog GND Chip enable input. This is not synchronized with the clock input signal. No signal (Output “H” and minimizes power consumption. Reference current output. Connect a resistance 16 times “16R ” that of output resistance OUT value “ ...
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... Pin No. Symbol I 47 — DD Equivalent circuit —5— CXD1178Q Description Current output pins. Voltage output can be obtained by connecting a resistance. Inverted current output. Normally dropped to analog GND. Digital V DD ...
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... CE CE Full-scale voltage of channel —6— =200 Ω =2.0 V, Ta=25 °C) DD OUT REF Min. Typ. Max. 8 0.5 40 –2.5 2.5 –0.3 0.3 1.8 2.0 2.2 0 1.5 3 2.4 0.8 – 1.8 4 1.8 4 –1 100 (%) CXD1178Q Unit bit MSPS LSB LSB pV• MΩ µ ...
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... Measurement Circuit Digital Input Current Maximum Conversion Velocity Measurement Circuit 8bit COUNTER with LATCH CLK 40MHz SQUARE WAVE +5.25V CXD1178Q BLK 26 CE 0.1µ VREF 27 RCK 28 35 GCK IREF 29 BCK —7— CXD1178Q 200 AV SS OSCILLOSCOPE 200 AV SS 200 0.1µ ...
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... SQUARE WAVE BLK 26 CE 0.1µ VREF 27 RCK 28 GCK IREF 29 BCK ALL “1” BLK 26 CE 0.1µ VREF 27 RCK 28 35 GCK IREF 29 BCK —8— OSCILLOSCOPE 0.1µ 1. 200 SPECTRUM AV SS ANALIZER 200 AV SS 200 0.1µ CXD1178Q ...
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... BLK 26 CE 0.1µ VREF 27 RCK 28 35 GCK IREF 29 BCK BLK 26 CE 0.1µ VREF 27 RCK 28 35 GCK IREF 29 BCK —9— 200 AV SS DVM 200 AV SS 200 0.1µ 200 AV SS OSCILLOSCOPE 200 AV SS 200 0.1µ CXD1178Q ...
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... PW1 PW0 0.1µ • • • • • • • • B (Blue) IN —10— 100% 50 (Blue) OUT 200 (Green) OUT 200 (Red) OUT 200 3. 0.1µ CLOCK CXD1178Q ...
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... Notes on Operation • How to select the output resistance The CXD1178Q is a D/A converter of the current output type. To obtain the output voltage connect the resistance to current output pins (RO, GO and BO). For specifications we have; Output full scale voltage Output full scale current Calculate the output resistance value from the relation of V output resistance is connected to reference current pin IREF ...
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... Latch Up Prevention The CXD1178Q is a CMOS IC which required latch up precautions. Latch up is mainly generated by the lag in the voltage rising time of AV (Pins 43 to 46) and Correct usage a. When analog and digital supplies are from different sources AV DD +5V + When analog and digital supplies are from a common source ...
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... Example when latch up easily occurs a. When analog and digital supplies are from different sources AV DD +5V + When analog and digital supplies are from common source ( (ii + CXD1178Q CXD1178Q CXD1178Q —13— DIGITAL IC C DIGITAL IC C DIGITAL IC C CXD1178Q ...
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... REF R =200 OUT R =3. —14— AV =DV = =2.0V REF R 16R IR OUT Ta=25°C 100 Output resistance OUT Glitch energy vs. Output resistance = =2.0V REF R =200 40 OUT R =3.3k IR Ta=25°C 100k 1M Output frequency F [Hz] OUT Crosstalk vs. Output frequency CXD1178Q 200 =5V DD 10M ...
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... M 0.24 PACKAGE STRUCTURE PACKAGE MATERIAL LEAD TREATMENT QFP-48P-L04 LEAD MATERIAL QFP048-P-1212 PACKAGE MASS —15— + 0.1 0.15 – 0.05 0.15 + 0.2 0.1 – 0.1 + 0.35 2.2 – 0.15 EPOXY RESIN SOLDER / PALLADIUM PLATING 42/COPPER ALLOY 0.7g CXD1178Q ...