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參數(shù)資料
| 型號： | TMC2081 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Digital Video Mixer(數(shù)字視頻混頻器) |
| 中文描述： | 數(shù)字視頻混合器（數(shù)字視頻混頻器） |
| 文件頁數(shù)： | 7/32頁 |
| 文件大小： | 158K |
| 代理商： | TMC2081 |
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PRODUCT SPECIFICATION
TMC2081
7
M
23-0
bits are clocked synchronously with the rising edge of
CLK. M
23-0
data outputs may be disabled to a high-imped-
ance state by setting the MOUT Control Register bit LOW.
Analog Preview
Either crosspoint switch input (A or B) or the mixed
pixel data output (M
23-0
) can be monitored by D/A
con-verters. D/A outputs may be either YC
B
C
R
or GBR.
A YC
B
C
R
-to-GBR matrix prior to the D/A converters can
be selected for color-space conversion.
To view A or B data originating in the C
B
C
R
format, the
DACFRM Control Register bit must be set to convert 2’s-
complement data to the offset binary format.
With the DACSLP bit, D/A converters can be powered down
and with the DACOVL bit, the D/A overlay RAM can be
powered down.
D/A Converter Outputs
Each D/A converter comprises an array of current sources
referenced to V
DD
and controlled by the data, BLANK, and
SYNC inputs. When BLANK = HIGH, the SETUP Control
Register bit determines if a pedestal is activated. With nomi-
nal R
REF
and V
REF
, outputs match SMPTE 170M levels
when terminated with a 37.5
W
resistive load (75
W
at the
source and destination). By doubling R
REF
, a 75
W
load can
be accommodated.
Full scale current is set by an external resistor, R
SET
, con-
nected between the R
REF
pin and A
GND
and the reference
voltage, V
REF
. V
REF
may be derived from either a 1.235 volt
internal source or an external voltage reference connected to
V
REF.
Nominal outputs (see Figure 2 and Figure 3) are expressed in
Current Units (IU) where 1 IU is equivalent to the current
activated by one unit of D/A input data (Gdata/Ydata, Bdata/
C
R
data, or Rdata/C
B
data). SETUP = HIGH activates a 21 IU
pedestal when BLANK= H. SYNC = LOW disables a 110
IU sync pulse. SETUP is programmed through Register 7
bit 2.
Figure 2. GBR/Y DAC Output Levels in Current Units
data: 255 IU max.
65-2081-04
pedestal: 21 IU
sync: 110 IU
Figure 3. C
B
C
R
DAC Output Levels in Current Units
To translate IUs to millivolts, V
REF
and R
SET
must be set
to the correct values, nominally V
REF
= 1.235 volt and
R
SET
= 681 ohms. In each table below, G and the Y outputs
have been normalized to 1000 mV with Data = 255.
Since V
REF
and R
REF
are common to all D/A converters,
B and R full scale outputs track G. C
B
C
R
full scale outputs
track Y. R
REF
may be trimmed to set the G or Y full scale
voltage to 1000 mV.
In the equations for the GBR and YC
B
C
R
outputs that follow,
symbols are defined as:
+ = plus
* = multiply
& = logical AND
! = logical complement
GBR Output
Expressed in IUs, the GBR transformation from data to
current is as follows:
G = (Gdata + SETUP * 21) & BLANK + SYNC * 110
B = (Bdata + SETUP * 21) & BLANK
R = (Rdata + SETUP * 21) & BLANK
Sample outputs are listed in Table 9 and Table 10.
Table 9. GBR DAC Transfer Characteristic
without Pedestal (SETUP = L)
D/A
Input
Data
255
128
0
X
X
128
G
B or R
SYNC BLANK
1
1
1
1
0
0
IU
365
238
110
110
0
128
mV
1000
652
301
301
0
351
IU
255
128
0
0
0
128
mV
699
351
0
0
0
351
1
1
1
0
0
1
max.: 255 IU
blank: 128 IU
min.: 0 IU
128
65-2081-05
0
-127
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