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NTE821 Integrated Circuit TV Chroma Demodulator
Description: Specifically designed to match advances in color picture tube phosphors, the NTE821 is a monolithic silicon integrated circuit in a 14-Lead DIP type package and consists of three output amplifiers, a new resistor matrix, two double-balanced chroma demodulators, and a very stable bias circuit. When used with the NTE714 subcarrier regeneration system and the NTE715 chroma amplifier, this device completes the typical three-block chroma system. Alternatively, the NTE821 chroma demodulator can be used with the NTE738 chroma processor to form a complete two-block chroma system. The output amplifiers are specifically designed to meet the low impedance, short-circuit protected driving requirements of high-level color output amplifiers. Internal ripple filter capacitors greatly reduce the high-frequency components of demodulation and thereby extend the output voltage swing capability of the output stages and at the same time eliminates the need for external output filtering components. Features: D Output Short-Circuit Protection D Excellent Subcarrier Rejection D 600mV Maximum Offset Voltage D 2mV/C Typical Temperature Stability D Good Chroma Sensitivity Absolute Maximum Ratings: (TA = +25C unless otherwise specified) Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to +85C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Maximum Voltage and Current Ratings (TA = +25C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Table
Current in mA Pin # 1 2 3 4 5 6 7 Voltage Range in Volts No Connection No Connection 0 to +5.0 0 to +5.0 No Connection 0 to +12 0 to +12 Input - - - - - - - Output - - - - - - - Pin # 8 9 10 11 12 13 14 Voltage Range in Volts 0 to +27 0 to +20 No Connection 0 to +20 No Connection 0 to +20 Reference Current in mA Input Note 2 1.0 - 1.0 - 1.0 1.0 Output 1.0 Note 1 - Note 1 - Note 1 Note 2
Note 1. Maximum continuous current output is 20mA and is limited by package power dissipation. Short circuit current is typically 50mA. Note 2. Limited by package power dissipation.
Electrical Characteristics: (TA = +25C, VCC = 24V, RL = 3.3k, Reference Input Voltage = 1VP-P unless otherwise specified)
Parameter Static Characteristics Quiescent Output Voltage Quiescent Input Current 9, 11, 13 8 RL = , Chroma and Reference Voltage = 0 Chroma and Reference Voltage = 0 Reference Input Voltage Chroma Input Voltage Differential Output Voltage Output Temperature Coefficient Dynamic Characteristics Detector Output Voltage (B-Y) Chroma Input Voltage Detector Output Voltage (G-Y) Detector Output Voltage (R-Y) Relative Output Phase (B-Y to R-Y) Relative Output Phase (B-Y to G-Y) Demodulator Unbalanced Voltage Residual Carrier and Harmonics Reference Input Resistance Reference Input Capacitance Chroma Input Resistance Chroma Input Capacitance 13 3 9 11 13-11 13-9 Note 4 B-Y Output = 5VP-P, Note 5 Adjust B-Y Output to 5VP-P, Note 6 Adjust B-Y Output to 5VP-P, Note 6 B-Y Output = 5VP-P B-Y Output = 5VP-P 8 - 1.4 4.3 85 236 - - - - - - 13 300 1.75 4.65 90 244 250 - 2.0 6.0 1.0 2.0 - 700 2.1 5.0 95 252 500 1.5 - - - - VP-P mVP-P VP-P VP-P deg deg mVP-P VP-P k pF k pF 6, 7 3, 4 9, 11, 13 Note 3 9, 11, 13 No Output Differential Voltage, Note 3 13.0 14.3 16.0 - 6.0 - V mA mA V V mV mV/C Test Pin Test Conditions Min Typ Max Unit
16.5 19.0 25.5 - - - - 6.6 3.5 200 2.0 - - 600 -
9, 11, 13 No Chroma Input Voltage and Normal Reference Signal Input Voltage 9, 11, 13 With Input Signal Voltage, Normal Reference Signal Voltage and B-Y = 5VP-P 6, 7 6, 7 3, 4 3, 4 Chroma Input = 0 Chroma Input = 0
Note 3. With chroma input signal voltage = 0 and normal reference input signal voltage (1VP-P), all output voltages will be within specified limits and will not differ from each other by greater than 0.6V. Note 4. With normal reference input signal voltage, adjust chroma input signal voltage to 1.2VP-P. Note 5. With normal reference input signal voltage, adjust chroma input signal voltage until the B-Y output voltage = 5VP-P. The chroma input voltage at this point should be equal to or less than 0.7VP-P. Note 6. With normal reference input signal voltage, adjust the chroma input signal until the B-Y output voltage = 5VP-P. At this point, the R-Y and G-Y voltages will fall within the specified limits.
Pin Connection Diagram
N.C. N.C. Chroma Input Chroma Input N.C. Ref Subcarrier Ref Subcarrier
1 2 3 4 5 6 7
14 GND 13 B - Y Output 12 N.C. 11 R - Y Output 10 N.C. 9 8 G - Y Output VCC
14
8
1
7
.785 (19.95) Max
.300 (7.62)
.200 (5.08) Max
.100 (2.45) .600 (15.24)
.099 (2.5) Min

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