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| TV SAT IF-FM-Demodulator TDA 6140-5X Preliminary Data Bipolar IC Features q q q q q Input sensitivity approx. - 40 dBm Symmetrical, low impedance IF-Input Two AFC-Outputs for up and down direction of tuning AFC-offset adjustable by an external control voltage Reduced external components P-DSO-16-1 Type TDA 6140-5X Ordering Code Q67000-A5172 Package P-DSO-16-1 (SMD) Amplifier and IF demodulator for satellite applications, consisting of: two-stage limiter amplifier; divider by 4; video amplifier; AGC; AFC-stage; reverse polarity switch for video signals. Semiconductor Group 1 04.95 TDA 6140-5X Pin Configuration (top view) P-DSO-16-1 Pin Definitions and Functions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol AGC AS SK SK GND VP + VAFC - VAFC A0 AF TF VA Function AGC-control voltage output AGC-threshold adjust Demodulator tank circuit Demodulator tank circuit Ground Video polarity switch input for positive or negative modulation Output for AFC-control (up) Output for AFC-control (down) External AFC-offset voltage input AFC-window width-adjust AFC-lowpass filter Video output Supply voltage IF-reference input IF-input AGC-lowpass filter VS IFREF IFIN ATF Semiconductor Group 2 TDA 6140-5X Block Diagram Semiconductor Group 3 TDA 6140-5X Circuit Description By capacitive coupling, the FM modulated satellite IF-signal is fed into the input of a symmetrical limiter amplifier. Asymmetrical operation of this limiter amplifier is also possible, if one of the two inputs is blocked against high frequency signals. The output signal of the amplifier is divided by four and sent directly as well as phase shifted to the quadrature demodulator. The phase shifting is done using an external LC tank circuit. The demodulated video signal is amplified and available on the video output. The AFC stage detects frequency offsets. The output signals of the AFC stage are available at the AFC "up" and AFC "down" control pins as an information to be processed in a microprocessor. A channel-dependent offset of the AFC curve can be adjusted by an external DC-voltage applied to the "AFC offset voltage" input pin. The AFC window width can be adjusted in the range of 0.5 to 1.5 MHz by means of an external resistance. The information for the field strength of the FM modulated IF satellite signal is available as a DC voltage at the AGC-output. The AGC-threshold can be adjusted by a potentiometer. The polarity of the demodulated video signal can be inverted by an external switching voltage fed into the polarity switch input pin (positive or negative modulation). Semiconductor Group 4 TDA 6140-5X Absolute Maximum Ratings TA = 0 to 70 C Parameter Supply voltage AGC-control voltage output AGC-threshold input Demodulator LC-circuit input Video P/N-switching AFC-control AFC-offset input AFC-window width AFC-lowpass filter Video output IF-inputs AGC-lowpass filter Junction temperature Storage temperature Thermal resistance Operating Range Supply voltage Input frequency range Ambient temperature during operation Symbol min. Limit Values max. 6 13 2 3 6 6 5 2 5 5 3 5 150 - 40 125 125 V V V V V V V V V V V V C C K/W Open collector Open collector 0 1 0.3 - 0.3 - 0.3 0 0 0.3 0 1 - 0.3 - 0.3 Unit Test Condition VS V1 V2 V3, 4 V6 V7, 8 V9 V10 V11 V12 V14, 15 V16 Tj Tstg Rth SA VS f15 TA 4.5 300 0 5.5 900 70 V MHz C Semiconductor Group 5 TDA 6140-5X Characteristics TA = 25 C; VS = 5 V (test circuit 1) Parameter Power consumption Static Specifications Input Sensitivity IF-input Input impedance Symbol min. Limit Values typ. 40 max. 50 mA 30 Unit Test Condition IS a15 R14, 15 C14, 15 - 40 500 1.3 3 dBm pF f15 = 480 MHz Parallel equivalent circuit Parallel equivalent circuit Video Output Voltage (Frequency deviation f = 13.5 MHz) Distortion factor Signal/noise ratio Video P/N-Switching Positive polarity Input current Negative polarity Input current V12 THD S/N 300 <1 70 700 mV % dB V6 I6 H V6 I6 L 3.5 50 1 - 50 V A V A AGC-Current (Open-collector current limited) a15 = - 22 dBm a15 = - 8 dBm I1 I1 10 500 A A V1 = 8 V; Pin 2 on ground V1 = 8 V; Pin 2 on ground AFC-Control (Open-collector current limited) f15 = 480 MHz f15 = 480 MHz +200 kHz V7/8 V7 V8 0.5 VS - 0.5 V V V RAFC = RAFC = (V8 = Low) RAFC = (V7 = Low) f15 =480 MHz - 200 kHz VS - 0.5 Semiconductor Group 6 TDA 6140-5X Test Circuit 1 Semiconductor Group 7 TDA 6140-5X Application Circuit Semiconductor Group 8 |
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