- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄374044 > ADV101* (Analog Devices, Inc.) CMOS 80 MHz. Triple 8-Bit Video DAC PDF資料下載
參數(shù)資料
| 型號： | ADV101* |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | CMOS 80 MHz. Triple 8-Bit Video DAC |
| 中文描述： | 80兆赫的CMOS。三8位視頻DAC |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 187K |
ADV101
–8–
REV. B
A resistance R
SET
connected between FS ADJUST and GND
determines the amplitude of the output video level according to
the following equations:
IOG
(
mA
) = 12,082
×
V
REF
(
V
)/
R
SET
(
) (1)
IOR
,
IOB
(
mA
) = 8,628
×
V
REF
(
V
)/
R
SET
(
) (2)
If
SYNC
is not being encoded onto the green channel, then
Equation 1 will be similar to Equation 2.
Using a variable value of R
SET
, as shown in Figure 4, allows for
accurate adjustment of the analog output video levels. Use of a
fixed 560
R
SET
resistor yields the analog output levels as
quoted in the specification page. T hese values also correspond
to the RS-343A video waveform values as shown in Figure 3.
TO DACs
ADV101*
V
AA
V
REF
GND
1k
FS ADJUST
SET
R
560
500
100
*ADDITIONAL CIRCUITRY, INCLUDING
DECOUPLING COMPONENTS,
EXCLUDED FOR CLARITY
ANALOG POWER PLANE
COMP
0.1
μ
F
5V
+
AD589
(1.235V
VOLTAGE
REFERENCE)
4mA
I
REF
~
Figure 4. Reference Circuit
D/A Converters
T he ADV101 contains three matched 8-bit D/A converters. T he
DACs are designed using an advanced, high speed, segmented
architecture. T he bit currents corresponding to each digital in-
put are routed to either the analog output (bit = “1”) or GND
(bit = “0”) by a sophisticated decoding scheme. As all this cir-
cuitry is on one monolithic device, matching between the three
DACs is optimized. As well as matching, the use of identical
current sources in a monolithic design guarantees monotonicity
and low glitch. T he onboard operational amplifier stabilizes the
full-scale output current against temperature and power supply
variations.
Analog Outputs
T he ADV101 has three analog outputs, corresponding to the
red, green and blue video signals. A fourth analog output
(I
SYNC
) can be used if it is required to encode video synchroni-
zation information onto the green signal. In this case, I
SYNC
is
connected to IOG. (See “Video Synchronization and Control”
section.)
T he red, green and blue analog outputs of the ADV101 are high
impedance current sources. Each one of these three RGB cur-
rent outputs is capable of directly driving a 37.5
load, such as
a doubly terminated 75
coaxial cable. Figure 5a shows the
DACs
IOR, IOG, IOB
Z = 75
(CABLE)
Z = 75
S
(SOURCE
TERMINATION)
Z = 75
L
(MONITOR)
TERMINATION REPEATED THREE TIMES
FOR RED, GREEN AND BLUE DACs
Figure 5a. Analog Output Termination for RS-343A
DACs
IOR, IOG, IOB
Z = 75
O
(CABLE)
Z = 150
S
(SOURCE
TERMINATION)
Z = 75
L
(MONITOR)
TERMINATION REPEATED THREE TIMES
FOR RED, GREEN AND BLUE DACs
Figure 5b. Analog Output Termination for RS-170
required configuration for each of the three RGB outputs con-
nected into a doubly terminated 75
load. T his arrangement
will develop RS-343A video output voltage levels across a 75
monitor.
A suggested method of driving RS-170 video levels into a 75
monitor is shown in Figure 5b. T he output current levels of the
DACs remain unchanged, but the source termination resistance,
Z
S
, on each of the three DACs is increased from 75
to 150
.
More detailed information regarding load terminations for vari-
ous output configurations, including RS-343A and RS-170, is
available in an application note entitled “Video Formats &
Required Load T erminations” available from Analog Devices,
publication number E1228-15-1/89.
Figure 3 shows the video waveforms associated with the three
RGB outputs driving the doubly terminated 75
load of Figure
5a. As well as the gray scale levels, black level to white level, the
diagram also shows the contributions of
SYNC
and
BLANK
.
T hese control inputs add appropriately weighted currents to the
analog outputs, producing the specific output level requirements
for video applications. T able I details how the
SYNC
and
BLANK
inputs modify the output levels.
Gray Scale Operation
T he ADV101 can be used for stand-alone, gray scale (mono-
chrome) or composite video applications (i.e., only one channel
used for video information). Any one of the three channels, red,
green or blue can be used to input the digital video data. T he
two unused video data channels should be tied to logical zero.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADV202BBCZ-150 | JPEG2000 Video Codec |
| ADV202 | Circular Connector; No. of Contacts:13; Series:LJTP02R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:11; Circular Contact Gender:Pin; Circular Shell Style:Box Mount Receptacle; Insert Arrangement:11-35 |
| ADV202-HD-EB | Circular Connector; No. of Contacts:13; Series:LJTP02R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:11; Circular Contact Gender:Pin; Circular Shell Style:Box Mount Receptacle; Insert Arrangement:11-35 |
| ADV202-SD-EB | Circular Connector; No. of Contacts:13; Series:LJTP02R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:11; Circular Contact Gender:Socket; Circular Shell Style:Box Mount Receptacle |
| ADV202BBC-115 | Circular Connector; No. of Contacts:22; Series:LJTP02R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:13; Circular Contact Gender:Pin; Circular Shell Style:Box Mount Receptacle; Insert Arrangement:13-35 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADV101KN30 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述: |
| adv101kn50 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述: |
| ADV101KN80 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADV101KP30 | 制造商:Rochester Electronics LLC 功能描述:TRIPLE 8 BIT CMOS V.DAC - Bulk 制造商:Analog Devices 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。