TDA4681 Datasheet, PDF (16/28 Pages) NXP Semiconductors – Video processor with automatic cut-off and white level control

Philips Semiconductors
Video processor with automatic cut-off
and white level control
Product specification
TDA4681
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX. UNIT
Automatic cut-off and white level control (pins 19 and 18); notes 9 to 11; see Fig.8
V₁₉
I₁₉
V_24,22,20
V_19(th)
V_ref
permissible voltage (also during
−
scanning period)
output current
−
input current
150
additional input current
only during warming up −
warming up amplitude (under I²C-bus switch-on delay 1
−
control; subaddress 0AH)
voltage threshold for picture tube
switch-on delay 1
−
cathode warming up
internally controlled voltage
during leakage
−
measurement period
−
V_P − 1.4 V
−
−140 µA
−
−
µA
0.5
−
mA
V_pdl − 0.7 −
V
5.0
−
V
3.0
−
V
DATA BYTE 07H FOR RED REFERENCE LEVEL, DATA BYTE 08H FOR GREEN REFERENCE LEVEL AND DATA BYTE 09H FOR BLUE
REFERENCE LEVEL
∆V₁₉
I₁₈
R₁₈
∆V₁₉
difference between V_MEAS (cut-off or 3FH (maximum V_MEAS) 1.5
−
white level measurement voltage) and _{20H (nominal VMEAS) −}
1.0
V_ref
00H (minimum V_MEAS) −
−
input current
white level
measurement
−
−
internal resistance
to V_ref; I₁₈ ≤ 800 µA
−
100
white level register (measured value white level
within tolerance range)
measurement
−
250
−
V
−
V
0.5
V
800
µA
−
Ω
−
mV
Storage of cut-off control voltage/output clamping voltage (pins 25, 23 and 21)
I_21,23,25 charge and discharge currents
during cut-off
−
0.3
measurement lines
input currents of storage inputs
outside measurement −
−
time
−
mA
0.1
µA
Storage of leakage information (pin 17)
I₁₇
charge and discharge currents
during leakage
−
measurement period
0.4
−
mA
leakage current
outside time LM
−
−
0.1
µA
V₁₇
voltage for reset to switch-on below
−
−
3.0
V
Hue control (under I²C-bus control; subaddress 03H; data byte 3FH for maximum voltage; data byte 20H for
nominal voltage and data byte 00H for minimum voltage); note 12
V₂₆
output voltage
at 3FH
at 20H
4.8
−
−
V
−
3.0
−
V
at 00H
I_int
current of the internal current source
at pin 26
−
−
500
−
1.0
V
−
µA
1997 Mar 04
16