The TDA4882 is an RGB pre-amplifier for colour monitor
systems with SVGA performance, intended for DC or AC
coupling of the colour signals to the cathodes of the CRT.
With special advantages the circuit can be used in
conjunction with the TDA485x monitor deflection IC family.
• White level adjustment for 2 channels only
• Brightness control with correct grey scale tracking
• Contrast control for all 3 channels simultaneously
• Cathode feedback to internal reference for cut-off
control, which allows unstabilized video supply voltage
• Current outputs for RGB signal currents
• RGB voltage outputs to external peaking circuits
• Blanking and switch-off input for screen protection
Figure 4 illustrates the signal processing. The RGB input
signals 0.7 V (p-p) are capacitively coupled into the
TDA4882 from a low ohmic source and are clamped to an
internal DC voltage (artificial black level). Composite
signals will not disturb normal operations because an
internal clipping circuit cuts all signal parts below black
level. Channels 1 and 3 have a maximum total voltage
gain of 7 dB (maximum contrast and maximum individual
channel gain), channel 2 having 4.4 dB (maximum
contrast and nominal gain). With the nominal channel gain
of 1 dB and nominal contrast setting the nominal
black-to-white output signal is 0.79 V (p-p). Brightness,
contrast and gain control is by DC voltage.
7.2Brightness control
Brightness control (Fig.4) yields a simultaneous signal
black-level shift of the three channels relative to a
reference black level.
1997 Sep 045
For nominal brightness (pin 1 open-circuit) the signal black
level is equal to the reference black level.
7.3Contrast control
Contrast is voltage controlled to affect the three channels
simultaneously (Fig.4). To provide the correct white point,
individual gain controls adjust the signals of channels 1
and 3 relative to the reference channel 2. Gain setting also
changes contrast to achieve correct grey scale tracking.
7.4Output stages
The output stages provide both voltage and current
outputs. External cascode transistors reduce power
consumption of the IC and prevent breakdown of the
output transistors. Signal output currents and peaking
characteristics are determined by external components at
the voltage outputs and the video supply. The channels
have separate internal feedback loops which ensure large
signal linearity and marginal signal distortion irrespective
of output transistor thermal V
variation (Fig.8).
BE
Page 6
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
7.5Input clamping
The clamping pulse (Fig.17) is for input clamping only.
The input signals are at black level during the clamping
pulse and are clamped to an internal artificial black level.
The coupling capacitors provide black-level storage.
The threshold for the clamping pulse is higher than that for
vertical blanking, therefore, the rise and fall times of the
clamping pulse need to be faster than 75 ns/V during
transition from 1 to 3.5 V.
7.6Vertical blanking
The vertical blanking pulse (Fig.17) will be detected if the
input voltage is higher than the threshold voltage for
approximately 320 ns but does not exceed the threshold
for the clamping pulse in the time between. During the
vertical blanking pulse the input clamping is disabled to
avoid misclamping in the event of composite input signals.
The input signal is blanked and the artificial black level is
inserted instead. Also the brightness is set internally to its
nominal value, thus the output signal is at reference black
level. The DC value of the reference black level will be
adjusted by cut-off stabilization.
7.7Horizontal blanking
During horizontal blanking (Fig.18) the output signal is set
to reference black level and output clamping is activated.
If the voltage exceeds the switch-off threshold, the signal
is blanked and switched to ultra-black level for screen
protection and spot suppression during V-flyback.
Ultra-black level is the lowest possible channel output
voltage and is not dependent on cut-off stabilization.
7.8Cut-off and black-level stabilization
For cut-off stabilization (DC coupling to the CRT) and
black-level stabilization (AC coupling) the video signal at
the cathode or the coupling capacitor is divided by an
adjustable voltage divider and fed to the channel feedback
inputs. During horizontal blanking time this signal is
compared with an internal DC voltage of approximately
5.8 V. Any difference will lead to a reference black-level
correction by charging or discharging the integrated
capacitor which stores the reference black-level
information between the horizontal blanking pulses.
7.9On Screen Display
For OSD (Fig.3), fast switching of control pin 6 to less than
1 V (e.g. 0.7 V) blanks the input signals. The OSD signals
can easily be inserted to the external cascode transistor.
7.10Test mode
During test mode (pins 9 and 10 connected to V
) the
P
black levels at the channel voltage outputs are set
internally to typical 0.7 V with nominal brightness and
3 V DC at channel signal inputs.
handbook, full pagewidth
OSD
fast blanking
1 kΩ
4.7 kΩ
100 pF
contrast
PH2222
TDA4882
6
20
17
14
Fig.3 OSD application.
1997 Sep 046
channel 1
channel 2
current
output
BFQ235
PH2222
150 Ω
channel 3
220 Ω
depending on
channel gain
1 kΩ to 10 kΩ
OSD
signal input
MHA816
Page 7
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
8LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOLPARAMETERMIN.MAX.UNIT
V
I
o(av)
I
OM
P
T
T
T
V
ext
tot
stg
amb
j
ESD
external DC voltage applied to the following pins:
pin 7 (V
pins 2, 5 and 8 (signal inputs)−0.1V
pins 20, 17 and 14 (current outputs)−0.1V
)08.8V
P
P
P
V
V
pins 12, 15 and 18 (channel feedback inputs)−0.1+0.7V
pins 1, 6, 3 and 11 (brightness, contrast and gain control inputs)−0.1V
pin 9 (horizontal blanking input)−0.1V
pin 10 (input clamping input)−0.1V
P
+ 0.7V
P
+ 0.7V
P
V
average output current (pins 20, 17 and 14); note 1050mA
peak output current (pins 20, 17 and 14)0100mA
total power dissipation−1200mW
storage temperature−25+150°C
operating ambient temperature−20+70°C
junction temperature−25+150°C
electrostatic handling for all pins; note 2−500+500V
Notes
1. Signal amplitude of 50 mA black-to-white is possible if the average current (including blanking times and signal
variation against time) does not exceed 50 mA. The maximum power dissipation of 1200 mW has to be considered.
2. Equivalent to discharging a 200 pF capacitor through a 0 Ω series resistor.
9THERMAL CHARACTERISTICS
SYMBOLPARAMETERCONDITIONSVALUEUNIT
R
th(j-a)
thermal resistance from junction to ambientin free air65K/W
1997 Sep 047
Page 8
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
10 CHARACTERISTICS
V
= 8.0 V; T
P
SYMBOLPARAMETERCONDITIONSMIN.TYP.MAX.UNIT
V
P
I
P
Video signal inputs (channels 1, 2 and 3)
V
i(b-w)
V
I(clamp)
I
I
Brightness control; note 2; Fig.5
V
i(BC)
R
i(BC)
V
i(BC)(nom)
∆V
bl
∆V
BT
=25°C; all voltages measured to GND (pin 4); note 1; see Fig.4; unless otherwise specified.
amb
supply voltage7.28.08.8V
supply current364860mA
input voltage, black-to-white−0.71.0V
DC voltage during input clamping
2.83.13.4V
(artificial black + VBE)
DC input currentno clamping; Vi=V
T
= −20 to +70 °C
amb
during clamping;
V
i=VI(clamp)
+ 0.7 V
during clamping;
V
i=VI(clamp)
− 0.7 V
I(clamp)
;
−0.05+0.05+0.250µA
5075120µA
−120−75−50µA
input voltage1.0−6.0V
input resistance405060kΩ
input voltage for nominal brightness pin 1 open-circuit2.02.252.5V
black-level voltage change at
voltage outputs referred to
reference black level during output
clamping (V
> 1.6 V) related
i(HBL)
V
= 1.0 V−13−11−9.5%
i(BC)
V
=6.0V303437%
i(BC)
pin 1 open-circuit−−0.8%
to output signal amplitude with
nominal 0.7 V (p-p) input signal and
nominal contrast (V
i(CC)
= 4.3 V) for
any gain setting
difference of ∆Vbl between any two
−1.20+1.2%
channels
Contrast control; note 3; Fig.6
V
i(CC)
V
i(CC)(max)
V
i(CC)(nom)
I
i(CC)
C/C
nom
input voltage1.0−6.0V
maximum input voltage−−V
input voltage for nominal contrastnote 4−4.3−V
input currentV
contrast relative to nominal contrast V
i(CC)
i(CC)
pins 3 and 11 open-circuit
V
i(CC)
pins 3 and 11 open-circuit
V
i(CC)(min)
∆G
track
input voltage for minimum contrastpins 3 and 11 open-circuit−0.7−V
tracking of output signals of
1V<V
channels 1, 2 and 3
t
df(C)
delay between leading (falling)
edges of contrast voltage and
voltage output waveforms
V
i(CC)
input fall time at pin 6:
t
f(CC)
1997 Sep 048
−1V
P
= 4.3 V−5−1−0.1µA
= 6.0 V;
= 1.0 V;
< 6 V; note 5−00.5dB
i(CC)
= 4.3 V to 0.7 V;
2.43.4−dB
−26−22−19dB
−720ns
= 2 ns; note 6; Fig.10
Page 9
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
SYMBOLPARAMETERCONDITIONSMIN.TYP.MAX.UNIT
t
dr(C)
t
f(C)
t
r(C)
Gain control (channel 1 and channel 3); note 7; Fig.7
V
i(GC)
V
i(GC)(nom)
R
i(GC)
∆Ggain control difference relative to
delay between trailing edges
(rising) of contrast voltage and
voltage output waveforms
fall time of voltage output waveform 90% to 10% amplitude; input
V
= 0.7 V to 4.3 V;
i(CC)
input rise time at pin 6:
t
= 2 ns; note 6; Fig.10
r(CC)
fall time at pin 6: t
f(CC
−1525ns
−615ns
) = 2 ns;
note 6; Fig.10
rise time of voltage output
waveform
10% to 90% amplitude; input
rise time at pin 6:
t
= 2 ns; note 6; Fig.10
r(CC)
−615ns
input voltage1.0−6.0V
input voltage for nominal gainpins 3 and 11 open-circuit3.63.753.95V
input resistance445566kΩ
V
nominal gain
(channels 1 and 3 only)
V
i(CC)
i(CC)
= 4.3 V; V
= 4.3 V; V
= 6 V22.63.3dB
i(GC)
=1V−5.5−5−4.5dB
i(GC)
Feedback input (channels 1, 2 and 3); note 8; Fig.8
V
ref(int)
I
o(FB)(max)
∆V
bl(CRT)
∆V
ref(T)
internal reference voltage5.65.86.1V
maximum output currentduring output clamping;
V
=3V
i(FB)
−500−100−60nA
black-level variation at CRTnote 9040200mV
variation of V
ref(int)
in the
T
= −20 to +70 °C02050mV
amb
temperature range
∆V
ref(int)(VP)
variation of V
with supply
ref(int)
7.2 V ≤ VP≤ 8.8 V060100mV
voltage
Voltage outputs (channels 1, 2 and 3)
V
o(b-w)(nom)
V
blx(max)
V
bl(SO)
nominal signal output voltage
(black-to-white value)
maximum adjustable black-level
voltage
black-level voltage during
switch-off, equal to minimum
pins 3 and 11 open-circuit;
V
i(CC)
= 4.3 V; V
i(b-w)
= 0.7 V
during output clamping;
T
= −20 to +70 °C
amb
V
i(HBL)=VP
T
amb
; RO=33Ω;
= −20 to +70 °C
0.690.790.89V
11.21.4V
3045100mV
adjustable black-level voltage
V
bl(TST)
black-level voltage during test
mode
V
i(HBL)=VP
; V
i(CL)=VP
open-circuit; Vi=V
I(clamp)
; pin 1
;
0.30.71.2V
note 10
S/Nsignal-to-noise rationote 11−5044dB
d
∆V
O(th)
bl(fl)
output thermal distortionI
black-level variation between
= 50 mA; note 12−0.61%
o(b-w)
line frequency 30 kHz−0.54.5mV
clamping pulses
V
offset(max)
maximum offset during sync
clipping
VI<V
I(clamp)
note 13; Fig.9
;
0715mV
1997 Sep 049
Page 10
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
SYMBOLPARAMETERCONDITIONSMIN.TYP.MAX.UNIT
∆V
o(b-w)(T)
Current outputs (channels 1, 2 and 3); note 14
I
o(b-w)
V
; V
20-19
V
14-13
I
bl(SO)
Frequency response at voltage outputs; note 15; Figs 11, 12 and 13
∆G
(f)
t
r(O)
dV
O
Crosstalk at voltage outputs with speed up circuit; note 16; Figs 14, 15 and 16
α
ct(tr)
Threshold voltages for clamping, blanking and switch-off; note 17
V
i(HBL)
R
i(HBL)
t
d(Hblank)
V
i(CL)
I
i(CL)
variation of nominal output signal
(black-to-white value) with
temperature
output current
(black-to-white value)
;
start of HF-saturation voltage of
17-16
output transistors
output current during switch-offV
gain decrease by frequency
pins 3 and 11 open-circuit;
V
= 4.3 V; V
i(CC)
T
= −20 to +70 °C
amb
i(b-w)
= 0.7 V;
02.510%
−50−mA
with peaking−−100mA
Io=50mA−−2.0V
= 100 mA−−2.2V
I
o
i(HBL)=VP
; RO=33Ω020900µA
70 MHz; single channel−1.33dB
response
rise time at voltage output10% to 90% amplitude; input
−4.15.0ns
rise time = 1 ns
overshoot of output signal pulse
related to actual output pulse
amplitude
single channel;
input rise time = 2.5 ns;
V
= 0.7 V;
i(b-w)
−48%
pins 3 and 11 open-circuit;
V
= 4.3 V
i(CC)
transient crosstalk−−−20dB
threshold for horizontal blanking
1.21.41.6V
(blanking, output clamping)
threshold for switch-off (blanking,
5.86.56.8V
minimum black-level, no output
clamping)
input resistanceagainst ground5080110kΩ
delay between horizontal blanking
input and output signal blanking
input rise time at
pin 9 > 100 ns;
−4060ns
note 18; Fig.18
threshold for vertical blanking
note 19; Fig.171.21.41.6V
(blanking, no input clamping)
threshold for clamping
note 19; Fig.172.63.03.5V
(input clamping, no blanking)
threshold for test mode
(no clamping, no blanking, see
V
bl(TST)
above)
currentV
for test mode also
V
> 6.8 V (switch-off)
i(HBL)
i(CL)<VP
V
i(CL)
−1V−3−1−µA
≥ VP− 1V−100−µA
VP− 1 −V
V
P
1997 Sep 0410
Page 11
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
SYMBOLPARAMETERCONDITIONSMIN.TYP.MAX.UNIT
t
, t
r(CL)
f(CL)
t
w(clamp)
t
d(Vblank)
Notes to the characteristics
1. Definition of levels:
a) Artificial black level: internal signal level behind input emitter follower during input clamping and signal clipping.
This level is inserted instead of the input signal during blanking.
b) Reference black level: DC voltage during output clamping at voltage outputs, not influenced by brightness,
contrast or gain setting, adjustable by cut-off stabilization.
c) Cut-off level: corresponding DC voltage at CRT cathode in closed feedback loop.
d) Black level: actual signal black level at either the voltage outputs or cathode, it can be adjusted by
(brightness × gain), it refers to reference black level or cut-off level.
e) Ultra-black level, switch-off level: lowest adjustable reference black level, lowest signal level at voltage outputs.
f) The minimum guaranteed control range for reference black level is 0.1 to 1 V. The ultra-black level is dependent
on the external resistor RO at pins 13, 16 and 19 (voltage outputs) to ground.
rise and fall time for clamping pulse note 19; Fig.17−−75ns/V
width of clamping pulse0.6−−µs
delay between vertical blanking
note 19; Fig.17260320380ns
input and internal blanking
R
V
g)
bl(SO)
2. Linear control range is 1 to 6 V for V
3. Linear control range is 1 to 6 V for V
setting. It is recommended not to exceed V
V
i(CC)<Vi(CC)(min)
o
-------------------------------
3.5 kΩ Ro+
4.65 V×≈
, independent of supply voltage.
i(BC)
, independent of supply voltage. Open pin 6 leads to maximum contrast
i(CC)
i(CC)=VP
−1 V to avoid saturation of internal circuitry. For
≈ 0.7 V a small negative signal (≈−40 dB) will appear. For frequency dependency of contrast
control see note 15.
4. Definition for nominal output signals: input V
V
i(CC)=Vi(CC)(nom)
5.dB
∆G
track
.
A
A
1
20 maximum of
×=
log
×
-------- -
-------- -
A
10
= 0.7 V, gain pins 3 and 11 open-circuit, contrast control
i(b-w)
A
20
A
2
A
1
log
-------- A
30
×
-------- A
10
3
log;;
A
-------- A
A
2
30
×
-------- A
20
3
Ax: signal output amplitude in channel x at any contrast setting between 1 and 6 V.
A
: signal output amplitude in channel x at nominal contrast and same gain setting.
x0
6. Typical step in contrast voltage and response at signal outputs for nominal input signal V
i(b-w)
= 0.7 V
(OSD fast blanking input/output).
7. Linear control range is 1 to 6 V for V
, independent of supply voltage.
i(GC)
8. The internal reference voltage can be measured at pins 18, 15 and 12 (channel feedback inputs) during output
clamping (V
9. Slow variations of video supply voltage V
Change of V
= 2 V) in closed feedback loop.
i(HBL)
(Fig.1) will be suppressed at CRT cathode by cut-off stabilization.
CRT
by 5 V leads to specified change of cut-off voltage.
CRT
10. The test mode allows testing without input and output clamping pulses. The signal inputs have to be biased via
resistors to the previously measured clamp voltages of approximately 3 V (artificial black level + VBE). Signal and
brightness blanking is not possible during test mode. The current outputs should be adjusted by resistors >> R0 from
voltage outputs to a positive voltage (e.g. VP).
1997 Sep 0411
Page 12
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
11. The signal-to-noise ratio is calculated by the formula (frequency range 1 to 70 MHz):
S
20
--- N
12. Large output swing e.g. I
Thermal VBE variation is compensated.
13. Composite signals will not disturb normal operation because an internal clipping circuit cuts all signal parts below
black level.
peak-to-peak value of the nominal signal output voltage
---------------------------------------------------------------------------------------------------------------------------------------------------log×=
RMS value of the noise output voltage
= 50 mA leads to signal-dependent power dissipation in output transistors.
o(b-w)
dB
14. The output current approximately follows the equation for V
R
= external resistor at voltage output to ground. The external RC combination (Fig.1) at pins 19, 16 and 13
O
I
o
------- -
o
R
1
V
O
+
----------------- -
2.2 kΩ
1
500 µA–=
o>Vbl(SO)
and with
(voltage outputs) enables peak currents during transients.
15. Frequency response, crosstalk and pulse response have been measured at voltage outputs on a special
printed-circuit board with 50 Ω line in/out connections and without peaking, see Chapter 11.
16. Crosstalk between any two voltage outputs (e.g. channels 1 and 2).
a) Input conditions: one channel (channel 1) with nominal input signal and minimum rise time. The inputs of the
other channels capacitively coupled to ground (channels 2 and 3). Gain pins 3 and 11 open-circuit.
b) Output conditions: output signal of channel 1 is set by contrast control voltage, to V
the rise time should be 5 ns. Output signal of channel 2 then is V
V
c) Transient crosstalk:dB
α
ct(tr)
20
o(VOUT2)
------------------------log×=
V
o(VOUT1)
o(b-w)=Vo(VOUT2)
.
o(b-w)=Vo(VOUT1)
= 0.7 V,
d) Crosstalk as a function of frequency has been measured without peaking circuit, with nominal input signal and
nominal settings.
17. The internal threshold voltages are derived from a stabilized voltage. The internal pulses are generated while the
input pulses are higher than the thresholds. Voltages less than −0.1 V at pins 9 and 10 can influence black-level
control and should be avoided.
18. The delay between HBL input pulse (horizontal blanking) and output signal blanking pulse and also brightness
blanking (∆Vbl), at the voltage outputs, depends on the input rise time of the HBL pulse. The specified values for
t
19. For 75 ns/V < t
are valid for HBL rise times greater than 100 ns only.
d(Hblank)
r(CL),tf(CL)
< 240 ns/V, generation of internal input clamping and blanking pulse is not defined. Pulses
not exceeding the threshold of input clamping (typical 3 V) will be detected as blanking pulses.
1997 Sep 0412
Page 13
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
handbook, full pagewidth
input signals
input signal at
pins 2, 5 and 8
with sync (on green)
input clamping pulse
at pin 10
horizontal blanking and
output clamping pulse
at pin 9
internal signal
behind input stage
output signals
(pins 19, 16 and 13)
at nominal gain and
contrast setting
and
maximum/nominal/
minimum brightness setting
at nominal gain and
maximum brightness setting
and
maximum/nominal/
minimum contrast setting
sync clipping to
artificial black level
video portion
video signal
horizontal flyback and output clamping
inserted artificial black level
max.
nom.
min.
brightness is set to nominal value during horizontal blanking
max.
nom.
min.
max.
black level equal to
artificial black level + V
by input clamping (approximately 3 V)
black level equal to artificial
black level by input clamping and
storage by coupling capacitor
∆ black level
due to brightness setting
reference black level
∆ black level for
maximum brightness
reference black level
BE
at nominal contrast and
maximum brightness setting
and
maximum/nominal/
minimum gain setting
signal at CRT cathode
at nominal gain and
contrast setting
and
maximum brightness setting
Fig.4 Signal processing.
1997 Sep 0413
nom.
min.
grey scale
reference black level
ultra black level
ground
high tension supply
voltage (e.g. 90 V)
(raster) cut-off level
black level
grey scale
MHA817
Page 14
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
50
handbook, halfpage
40
∆V
bl
(%)
30
20
10
0
−10
−20
−30
02
2.24
48
Fig.5 Typical brightness characteristic.
MHA818
400
(mV)
300
200
100
0
−100
−200
6
V
i (BC)
1400
handbook, halfpage
signal
amplitude
(mV)
1000
800
600
400
200
0
−200
024
0.7
4.3
MHA819
4
(dB)
3
2
1
0
−1
−3
−5
−10
−20
−40
(V)
8
6
V
i(CC)
Fig.6 Typical contrast characteristic.
V
i(GC)
MHA821
(V)
3
(dB)
2
1
0
−1
−2
−3
−4
−5
−6
−8
86
1200
handbook, halfpage
signal
amplitude
(mV)
800
400
0
0
24
3.75
Fig.7 Typical gain characteristic.
1997 Sep 0414
5.85
handbook, halfpage
5.84
V
ref(int)
5.83
(V)
5.82
5.81
5.80
5.79
5.78
5.77
5.76
5.75
−20080
Conditions: 0.5 V reference black level, no signal.
Fig.8Typical variation of V
VP = 8.8 V
8.0 V
7.2 V
402010060
ref(int)
and supply voltage.
MHA822
T
(°C)
amb
with temperature
Page 15
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
handbook, full pagewidth
input
signal
handbook, full pagewidth
OSD pulse
at pin 6
(V)
4.3
0.7
output signal
at pins 19, 16 and 13
(V)
output
signal
Fig.9 Typical sync clipping.
t
f(CC)
t
df(C)
t
r(CC)
t
dr(C)
V
MHA823
90%
50%
10%
t
offset(max)
Vbl + V
o(b-w)
Vbl = 0.7
= 1.5
V
o(b-w)
t
f(C)
Fig.10 Typical OSD fast blanking input/output waveforms.
1997 Sep 0415
t
r(C)
90%
50%
10%
t
MHA820
Page 16
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
handbook, full pagewidth
input pulse
(mV)
output pulse
(mV)
800
600
400
200
1000
800
600
400
0
tr ≈ 2.5 ns
MHA825
90%
tf ≈ 2.5 ns
10%
90%
Solid line: single channel.
Dotted line: white pattern.
Fig.11 Typical pulse response: VIN1, VIN2 and VIN3 → VOUT1, VOUT2 and VOUT3.
200
−200
tr ≈ 4.4 ns
10%
0
0
20406080100
tf ≈ 4.8 ns
t (ns)
1997 Sep 0416
Page 17
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
handbook, full pagewidth
3
signal
(dB)
0
−3
−6
−9
−12
−15
11010
Solid line: single channel.
Dotted line: white signal.
Fig.12 Typical frequency response.
2
f (MHz)
MHA824
3
10
10
handbook, full pagewidth
V
signal
(dB)
Solid line: single channel.
Dotted line: white signal.
i(cc)
0
−10
−20
−30
110
=
7 V
6 V
5 V
4 V
3 V
2 V
V
= 0.7 V
i(cc)
1 V
V
= 0.7 V
i(cc)
2
10
70120
Fig.13 Typical characteristic of contrast control as a function of frequency.
f (MHz)
MHA826
3
10
1997 Sep 0417
Page 18
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
handbook, full pagewidth
0
signal
(dB)
−10
−20
−30
−40
11010
(1) Solid line: channel 1.
Dashed line: channel 2.
Dotted line: channel 3.
channel
1
2
3
2
Fig.14 Typical crosstalk: channel 1 → 2 and 3.
MHA827
(1)
3
f (MHz)
10
handbook, full pagewidth
0
signal
(dB)
−10
−20
−30
−40
11010
(1) Solid line: channel 1.
Dashed line: channel 2.
Dotted line: channel 3.
channel
2
3
1
2
Fig.15 Typical crosstalk: channel 2 → 1 and 3.
MHA828
(1)
3
f (MHz)
10
1997 Sep 0418
Page 19
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
handbook, full pagewidth
0
signal
(dB)
−10
−20
−30
−40
11010
(1) Solid line: channel 1.
Dashed line: channel 2.
Dotted line: channel 3.
channel
3
1
2
2
Fig.16 Typical crosstalk: channel 3 → 1 and 2.
MHA829
(1)
3
f (MHz)
10
handbook, full pagewidth
3 V
V
i(CL)
1.4 V
internal pulses
input
clamping
blanking
t
r(CL)
t
f(CL)
no
clamping
t
d(Vblank)
Fig.17 Timing of pulses at CL (pin 10).
1997 Sep 0419
≈ 1/2 t
d(Vblank)
no
clamping
MHA831
t
t
t
Page 20
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
handbook, full pagewidth
t
d
(ns)
80
70
60
50
40
30
20
20406080100120 140
(1) Black level: 0.74 V.
(2) Reference black level: 0.5 V.
(3) Rise and fall times for HBL between 0.2 and 1.45 V.
(4) td is the delay at the end of brightness blanking.
t
d(Hblank)
t
HBL pulse
(V)
1.45
0.2
t
r
t
∆V
bl
d(Hblank)
50%
of ∆V
bl
output
signal
(V)
(1)
0.74
(4)
d
(2)
0.5
(3)
(ns)
tr,t
f
t
d
t
(4)
t
MHA830
Fig.18 Typical delay between HBL pulse and brightness blanking at voltage outputs.
1997 Sep 0420
Page 21
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
11 APPLICATION AND TEST INFORMATION
For high frequency measurements and special application,
a printed-circuit board with only a few external
components is built. Figure 19 shows the application
circuit and Fig.20 the layout of the double sided printed
board. All components on the underside and R13, R14
and R15 on the top are SMD types. Short HF loops and
minimum crosstalk between the channels as well as input
and output are achieved by properly shaped ground areas
star connected to the IC ground pin.
The HF input signal can be fed to the subclick connectors
P1, P2 and P3 by a 50 Ω line. The line is then terminated
by a 51 Ω resistor on the board. With choice of jumper
connections (J1, J2 and J3) it is possible to connect
channel inputs to its input connector, to connect all
channels to one input connector (white pattern) and to
ground each input via the coupling capacitor.
For operation without input clamping, e.g. test mode, the
DC bias can be provided by VIDC (connector P21) if a
short-circuit at J4, J5 and J6 is made (solder short or
low-value SMD resistor).
The output signal can be monitored via 50 Ω terminated
lines at the voltage outputs (subclick connectors
P4, P5 and P6). With 100 Ω in parallel to the 50 Ω
terminated line the effective load resistance at the voltage
outputs is 33 Ω. The mismatch seen from the line towards
the IC has no significant effect if the line is match
terminated. A peaking circuit, C15, R16 for channel 1
(C16, R17 for channel 2 and C17, R18 for channel 3), can
be added for realistic loading of the voltage outputs.
DC control for brightness, contrast and gain is provided at
connectors P21 and P22. Contrast control can also be set
by the potentiometer R28 (jumper J11). The series
resistor R11 is necessary if fast OSD switching is activated
via 50 Ω line (P10), a line termination can be provided at
the connector P9. Clamping and blanking pulses are fed to
the IC via connectors P7 and P8. Connector P23 is used
for power supply. The capacitors C7 and C8 should be
located as near as possible to the IC pins.
11.1Recommendations for building the application
board
• General
– Double-sided board
– Short HF loops by large ground plane on the rear.
• Voltage outputs
– Capacitive loads as small as possible
– Short interconnection via resistor to ground.
• Supply voltage
– Capacitors as near as possible to the pins
– Use of high-frequency capacitors (low self
inductance, e.g. SMD).
• Resonance suppression. The external interconnection
inductance to the current outputs can build a resonance
together with the internal substrate capacitance.
A damping resistor of 10 to 30 Ω near to the IC pin can
suppress such oscillations.
Black-level adjustment is made by VIOS, VFBX (external
voltages at connector P21) and resistors R19, R22
and R25 for channel 1 (channel 2: R20, R23 and R26;
channel 3: R21, R24 and R27). If R19 is equal to the
effective load resistor at the voltage output the reference
black level (V
V
V
ref(int)
ref(bl)
VIOS V
is the internal reference voltage at the feedback
) is approximately:
ref(bl)
–V
ref(int)
ref(int)
VFBX–()–
×=
R22
----------R25
input (typical 5.8 V). By this it is possible to adjust the
reference black level and the voltage at the current outputs
independently.
1997 Sep 0421
Page 22
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
handbook, full pagewidth
subclick connector (50 Ω)
solder point for short-circuiting
or SMD 0 Ω resistor
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
A
A
A
UNIT
inches
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
max.
mm
OUTLINE
VERSION
SOT146-1
12
min.
max.
1.73
1.30
0.068
0.051
IEC JEDEC EIAJ
b
b
1
0.53
0.38
0.021
0.015
0.014
0.009
REFERENCES
cD E eM
0.36
0.23
(1)(1)
26.92
26.54
1.060
1.045
SC603
1997 Sep 0425
6.40
6.22
0.25
0.24
10
(1)
M
e
L
1
3.60
8.25
3.05
7.80
0.14
0.32
0.12
0.31
EUROPEAN
PROJECTION
H
E
10.0
0.2542.547.62
8.3
0.39
0.010.100.30
0.33
ISSUE DATE
w
92-11-17
95-05-24
Z
max.
2.04.20.513.2
0.0780.170.0200.13
Page 26
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
14 SOLDERING
14.1Introduction
There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.
This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our
“IC Package Databook”
14.2Soldering by dipping or by wave
The maximum permissible temperature of the solder is
260 °C; solder at this temperature must not be in contact
with the joint for more than 5 seconds. The total contact
time of successive solder waves must not exceed
5 seconds.
15 DEFINITIONS
Data sheet status
Objective specificationThis data sheet contains target or goal specifications for product development.
Preliminary specificationThis data sheet contains preliminary data; supplementary data may be published later.
Product specificationThis data sheet contains final product specifications.
Limiting values
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information
Where application information is given, it is advisory and does not form part of the specification.
(order code 9398 652 90011).
The device may be mounted up to the seating plane, but
the temperature of the plastic body must not exceed the
specified maximum storage temperature (T
printed-circuit board has been pre-heated, forced cooling
may be necessary immediately after soldering to keep the
temperature within the permissible limit.
14.3Repairing soldered joints
Apply a low voltage soldering iron (less than 24 V) to the
lead(s) of the package, below the seating plane or not
more than 2 mm above it. If the temperature of the
soldering iron bit is less than 300 °C it may remain in
contact for up to 10 seconds. If the bit temperature is
between 300 and 400 °C, contact may be up to 5 seconds.
stg max
). If the
16 LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.
1997 Sep 0426
Page 27
Philips SemiconductorsProduct specification
Advanced monitor video controller for OSDTDA4882
NOTES
1997 Sep 0427
Page 28
Philips Semiconductors – a worldwide company
Argentina: see South America
Australia: 34 Waterloo Road, NORTH RYDE, NSW 2113,
United States: 811 East Arques Avenue, SUNNYVALE, CA 94088-3409,
Tel. +1 800 234 7381
Uruguay: see South America
Vietnam: see Singapore
Yugoslavia: PHILIPS, Trg N. Pasica 5/v, 11000 BEOGRAD,
Tel. +381 11 625 344, Fax.+381 11 635 777
For all other countries apply to: Philips Semiconductors, Marketing & Sales Communications,
Building BE-p, P.O. Box 218, 5600 MD EINDHOVEN, The Netherlands, Fax. +31 40 27 24825
The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed
without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license
under patent- or other industrial or intellectual property rights.
Internet: http://www.semiconductors.philips.com
Printed in The Netherlands547047/1200/02/pp28 Date of release: 1997 Sep 04Document order number: 9397 750 02268
Loading...
+ hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.