Details, datasheet, quote on part number: MC44251D
DatasheetDownload MC44251D datasheet


Features, Applications

Advance Information Triple 8-Bit Video ADC Three-State Outputs

The MC44251 contains three independent parallel analog­to­digital flash converters (ADC). Each ADC consists of 256 latching comparators and an encoder. Video may or dc coupled. With ac coupling, input clamping provides for internal dc restoration. The MC44251 also contains a dithering generator for video processing performance enhancements. The MC44251 is especially suitable as a front­end converter in TV­picture digital processing (picture­in­picture, frame storage, etc.). The high speed conversion rate of the ADC is suitable for video bandwidth of well over 6 MHz. 18 MHz Maximum Sampling Rate Three­State Output Buffers Output Latching Minimizes Skew Input Clamps Suitable for RGB and YUV Applications Built­In Dither Generator with Subsequent Digital Correction Single 5­Volt Power Supply Operating Temperature Range: + 85°C VTN and HZ Input Threshold Hysteresis Built­In

NOTE: The FN package is not recommended for new designs. It is scheduled for phase out in late 1996.

This document contains information on a new product. Specifications and information herein are subject to change without notice. REV 4 7/96

Symbol VDD(A), VDD(D), VDD(R) Vin Iin Iout Tstg Characteristic DC Supply Voltage (referenced to VSS) Input Voltage, All Pins DC Input Current per Pin DC Output Current per Pin Storage Temperature Range Value 0.5 to VDD + 150 Unit mA °C This device contains protection circuitry to guard against damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high­impedance circuit. For proper operation, Vin and Vout should be constrained to the range VSS (Vin or Vout) VDD. Unused inputs must always be tied to an appropriate logic voltage level (e.g., either VSS or VDD). Unused outputs must be left open.

NOTE: Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions.

ELECTRICAL CHARACTERISTICS (Voltages Referenced to VSS) (VDD(R) = VDD(A) = VDD(D); Rbias (Pin k to ground) OPERATING RANGES

Symbol VDD(A), VDD(D), VDD(R) IDD(A) IDD(R) IDD(D) TA Power Supply Voltage Analog Supply Current Reference Supply Current Digital Supply Current Operating Ambient Temperature Range Characteristic Min ­ 40 Max Unit mA °C

Symbol Cin Vmin Vmax Vrange Gain DNL INL Egain Eoff Input Capacitance See Figure 11 See Figure 11 See Figure 11 See Figure 11 (Note 1) Differential Nonlinearity (Note 1) Integral Nonlinearity (Note 1) Gain Difference (Note 2) Offset Difference (Notes 1, 2) Characteristic Min 0.3 x VDD 0.89 x VDD 0.57 x VDD 0.95 Max 0.36 x VDD 0.93 x VDD 0.59 x VDD Unit pF V LSB % LSB


Symbol VIH VIL IIL IIH RATE twL twH tr tf Clock Input High Level Clock Input Low Level Low Level Input Current High Level Input Current Conversion Rate Clock Low Duration, Figure 1 Clock High Duration, Figure 1 Clock Rise Time to 90%), Figure 1 Clock Fall Time to 90%), Figure 1 Characteristic Min 4.2 27.5 Max Unit V µA ms/s ns

Symbol VIH VIL VHYS IIL IIH tH Characteristic HZ and VTN Input Turn­On Threshold Voltage HZ and VTN Input Turn­Off Threshold Voltage Hysteresis Voltage Low Level Input Current High Level Input Current HZ High Time, Figure 3 Min 0.56 x VDD 0.11 x VDD 3 Max 0.29 x VDD 0.17 x VDD Unit µA ns

Symbol VIH VIL IIN Input High Level Clamping Source Current Input Leakage Current Characteristic Min 3.5 Max ± 2.0 Unit V µA

Symbol Isink Isource DICL Clamping Sink Current Clamping Source Current Clamping Current Difference (Note 2) Clamping Levels (Max. Deviation Compared to Table 1) Characteristic Min ­ 5.0 Max Unit µA LSB

Characteristic RTOP Output Impedance RBOT Output Impedance RMID Output Impedance Min 28 70 Max 48 130 Unit

Symbol VIL VIH VIZ IIL IIH IIZ Logical "0" Level Logical "1" Level Logical "Open" Level Input Current at "0" Level Input Current at "1" Level Input Current at "Open" Level Characteristic Min 4.2 2 Max 0.8 VDD(D) Unit V µA


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