參數(shù)資料
型號(hào)： TDA4886
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 消費(fèi)家電
英文描述： 140 MHz video controller with I2C-bus
中文描述： SPECIALTY CONSUMER CIRCUIT, PDIP24
文件頁(yè)數(shù)： 19/52頁(yè)
文件大?。?/td> 495K
代理商： TDA4886
1998 Nov 11
19
Philips Semiconductors
Product specification
140 MHz video controller with I
2
C-bus
TDA4886
19. Pedestal blanking produces an ultra black level during blanking and output clamping which is the most negative
signal at the signal output pins. The reference black level which should correspond to the ‘extended cut-off voltage’
at the cathodes is approximately
V
22,19,16(PED)
higher (see Fig.5). The use of
pedestal blanking
with AC-coupled
cathodes (control bit FPOL = 1) allows a very simple black level restoration with a DC diode clamp instead of a
complicated pulse restoration circuit.
20. DC load currents of signal outputs must not exceed maximum sink currents, otherwise signal distortions may occur.
21. The signal-to-noise ratio is calculated by the formula (range 1 to 120 MHz):
S
N
RMS value of the noise output voltage
22. Large output currents e.g. I
22,19,16(M)(source)
lead to signal depending power dissipation in output transistors. Thermal
V
BE
variation is compensated.
23. Following formula can be used to approximately determine the output rise/fall time for any other input rise/fall time:
2
t
r/f (22,19,16)
t
r/f, input
1ns
–
24. Transient crosstalk between any two output pins:
a)
Input conditions
: any channel (channel A) with nominal input signal and 1 ns rise time. The inputs of the other
two channels are capacitively coupled to ground (channel B). Gain setting to maximum (3FH). Contrast setting to
nominal (26H). No limiting/modulation of contrast (V
24
≥
5 V)
b)
Output conditions
: black level set to approximately 0.77 V for each channel at signal outputs. Output signals
are V
A
and V
B
respectively
c)
Transient crosstalk suppression
:
25. The internal feedback reference voltages are not influenced by the value of control bit PEDST but depend on the
individual adjustments via the I
2
C-bus, the selected feedback polarity (control bit FPOL = 0 or 1) and the selected
black level for positive feedback polarity (control bit FPOL = 1 and control bits BLH2 = 0 or 1 and BLH1 = 0 or 1):
Control bit FPOL = 0
: the internal feedback reference voltage acts under I
2
C-bus control; subaddress 07H
(channel 1), 08H (channel 2) and 09H (channel 3; bit resolution 0.4% of voltage range). Rising values of the data
bytes, e.g. 00H to FFH, correspond to rising values of the resulting reference black levels at signal outputs
(pins 22, 19 and 16). The internal feedback reference voltages can be measured at feedback inputs
(pins 23, 20 and 17) during output clamping (V
11
> 3.5 V) in closed feedback loop. The feedback loop remains
operative at reference black levels between the specified values of V
22,19,16(rbl)(min)
and V
22,19,16(rbl)(max)
.
Control bit FPOL = 1
: the internal feedback reference voltage can be measured at signal outputs
(pins 22, 19 and 16) during output clamping (V
11
> 3.5 V). By means of control bits BLH2 and BLH1 it is possible to
choose one of the four specified values between approximately 0.75 and 1.5 V. This facilitates the adaption to
different kinds of post amplifiers.
26. Slow variations of video supply voltage V
CRT
will be suppressed at the CRT cathode by the clamping feedback loop.
A change of V
CRT
with 5 V leads to a specified change of the cathode voltage.
27. The external reference voltages act under I
2
C-bus control for control bit FPOL = 1; subaddress 07H (FB/R
1
), 08H
(FB/R
2
) and 09H (FB/R
3
; bit resolution 0.4% of voltage range).
28. All adjustments via the I
2
C-bus can be synchronized with vertical blanking pulse at pin CLI. This is called I
2
C-bus
transmission in buffered mode. The adjustments via the I
2
C-bus will take effect immediately in the so called direct
mode.
The timing of I
2
C-bus transmissions in buffered mode is related to the vertical blanking. See specification of pin 5
(vertical blanking input) and note 7.
---
20
peak-to-peak value of the nominal signal output voltage
log
×
=
t
r/f, measured
2
2
(
)
2
+
=
α
ct(tr)
20
V
B
V
log
×
=
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