TDA4680 |
RFQ for TDA4680 Required Field |
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| Product | Manufacturers | Pack | D/C |
| TDA4680 | - | - | 06+ |
The TDA4680 is a monolithic integrated circuit with a colour difference interface for video processing in TV receivers. Its primary function is to process the luminance and colour difference signals from multistandard colour decoders, TDA4555, TDA4650/T, TDA4655/T or TDA4657, Colour Transient Improvement (CTI) IC, TDA4565, Picture Signal Improvement (PSI) IC, TDA4670, or from a feature module.
The required input signals are:
· Luminance and negative colour difference signals
· 2 or 3-level sandcastle pulse for internal timing pulse generation
· I2C-bus data and clock signals for microcontroller control.
Two sets of analog RGB colour signals can also be inserted, e.g. one from a peritelevision connector and the other from an on-screen display generator; both inputs are fully-controlled internally. The TDA4680 includes full I2C-bus control of all parameters and functions with automatic cut-off and white level control of the picture tube cathode currents. It provides RGB output signals for the video output stages.
There is a very similar IC TDA4681 available. The only differences are in the NTSC matrix.
Features |
| · Operates from an 8 V DC supply· Black level clamping of the colour difference, luminance and RGB input signals with coupling-capacitor DC level storage· Two fully-controlled, analog RGB inputs, selected either by fast switch signals or via I2C-bus· Saturation, contrast and brightness adjustment via I2C-bus· Same RGB output black levels for Y/CD and RGB input signals· Timing pulse generation from either a 2 or 3-level sandcastle pulse for clamping, horizontal and vertical synchronization, cut-off and white level timing pulses· Automatic cut-off control with picture tube leakage current compensation· Software-based automatic white level control or fixed white levels via I2C-bus· Cut-off and white level measurement pulses in the last 4 lines of the vertical blanking interval (I2C-bus selection for PAL, SECAM, or NTSC, PAL-M)· Increased RGB signal bandwidths for progressive scan and 100 Hz operation (selected via I2C-bus)· Two switch-on delays to prevent discolouration before steady-state operation· Average beam current and peak drive limiting· PAL/SECAM or NTSC matrix selection via I2C-bus· Three adjustable reference voltage levels (via I2C-bus) for automatic cut-off and white level control· Emitter-follower RGB output stages to drive the video output stages· Hue control output for the TDA4555, TDA4650/T, TDA4655/T or TDA4657. |
| SYMBOL | PARAMETER | MIN. | MAX. | UNIT |
| VP | supply voltage (pin 5) | - | 8.8 | V |
| Vi | input voltage (pins 1 to 8, 10 to 13, 16, 21, 23 and 25) input voltage (pins 14, 15, 18 and 19) input voltage (pins 27 and 28) |
-0.1 -0.7 -0.1 |
+VP VP + 0.7 +8.8 |
V V V |
| Iav IM I18 I26 Tstg Tamb |
average current (pins 20, 22 and 24) peak current (pins 20, 22 and 24) input current output current storage temperature operating ambient temperature |
+4 +4 0 +0.5 -20 0 |
-10 -20 2 -8 +150 70 |
mA mA mA mA °C °C |
| Ptot | total power dissipation SOT117-1 SOT261-2 |
- - |
1.2 1.0 |
W W |
