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TDA4680

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 a...

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SeekIC No. : 004516372 Detail

TDA4680: 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 ...

TDA4680 Data Sheet

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Part Number:
TDA4680
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



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.


Pinout

Connection Diagram


Specifications

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



Description

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 of the TDA4680 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 TDA4680 available. The only differences are in the NTSC matrix.




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