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參數(shù)資料
| 型號(hào)： | ADV7340EBZ |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Multiformat Video Encoder, Six 12-Bit Noise Shaped Video㈢ DACS |
| 中文描述： | 多格式視頻編碼器，6個(gè)12位噪聲整形視頻㈢交叉連接系統(tǒng) |
| 文件頁數(shù)： | 66/88頁 |
| 文件大?。?/td> | 1066K |
| 代理商： | ADV7340EBZ |
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ADV7340/ADV7341
PRINTED CIRCUIT BOARD LAYOUT AND DESIGN
DAC CONFIGURATIONS
The ADV7340/ADV7341 contain six DACs. All six DACs can
be configured to operate in low drive mode. Low drive mode is
defined as 4.33 mA full-scale current into a 300 Ω load, R
L
.
DAC 1, DAC 2, and DAC 3 can also be configured to operate in
full-drive mode. Full-drive mode is defined as 34.7 mA full-
scale current into a 37.5 Ω load, R
L
. Full-drive is the recommended
mode of operation for DAC 1, DAC 2, and DAC 3.
The ADV7340/ADV7341 contain two R
SET
pins. A resistor
connected between the R
SET1
pin and AGND is used to control
the full-scale output current and, therefore, the DAC output
voltage levels of DAC 1, DAC 2, and DAC 3. For low drive
operation, R
SET1
must have a value of 4.12 kΩ, and R
L
must have a
value of 300 Ω.
For full-drive operation, R
SET1
must have a value
of 510 Ω, and R
L
must have a value of 37.5 Ω.
A resistor connected between the R
SET2
pin and AGND is used
to control the full-scale output current and, therefore, the DAC
output voltage levels of DAC 4, DAC 5, and DAC 6. R
SET2
must
have a value of 4.12 kΩ, and R
L
must have a value of 300 Ω (that
is, low drive operation only).
The resistors connected to the R
SET1
and R
SET2
pins should have a
1% tolerance.
The ADV7340/ADV7341 contain two compensation pins,
COMP1 and COMP2. A 2.2 nF compensation capacitor should
be connected from each of these pins to V
AA
.
VOLTAGE REFERENCE
The ADV7340/ADV7341 contain an on-chip voltage reference
that can be used as a board-level voltage reference via the V
REF
pin. Alternatively, the ADV7340/ADV7341 can be used with an
external voltage reference by connecting the reference source to
the V
REF
pin. For optimal performance, an external voltage
reference such as the AD1580 should be used with the
ADV7340/ADV7341. If an external voltage reference is not
used, a 0.1 μF capacitor should be connected from the V
REF
pin
to V
AA
.
VIDEO OUTPUT BUFFER AND OPTIONAL
OUTPUT FILTER
An output buffer is necessary on any DAC that operates in low
drive mode (R
SET
= 4.12 kΩ, R
L
= 300 Ω). Analog Devices, Inc.
produces a range of op amps suitable for this application, for
example, the AD8061. For more information about line driver
buffering circuits, see the relevant op amp data sheet.
An optional reconstruction (anti-imaging) low-pass filter (LPF)
may be required on the ADV7340/ADV7341 DAC outputs if the
part is connected to a device that requires this filtering.
The filter specifications vary with the application. The use of
16× (SD), 8× (ED), or 4× (HD) oversampling can remove the
requirement for a reconstruction filter altogether.
Rev. 0 | Page 66 of 88
For applications requiring an output buffer and reconstruction
filter, the ADA4430-1, ADA4411-3, and ADA4410-6 integrated
video filter buffers should be considered.
Table 53. ADV7340/ADV7341 Output Rates
Input Mode
(0x01, Bits[6:4])
(0x00, Bit 1)
Off
SD Only
On
Off
ED Only
On
Off
HD Only
On
PLL Control
Output Rate (MHz)
27
216
27
216
74.25
297
(2x)
(16x)
(1x)
(8x)
(1x)
(4x)
Table 54. Output Filter Requirements
Application
SD
SD
ED
ED
HD
HD
Oversampling
2×
16×
1×
8×
1×
4×
Cutoff
Frequency
(MHz)
>6.5
>6.5
>12.5
>12.5
>30
>30
Attenuation
–50 dB @
(MHz)
20.5
209.5
14.5
203.5
44.25
267
560
600
22pF
600
DAC
OUTPUT
75
BNC
OUTPUT
10μH
560
3
4
1
0
Figure 84. Example of Output Filter for SD, 16× Oversampling
560
6.8pF
600
6.8pF
600
DAC
OUTPUT
75
BNC
OUTPUT
4.7μH
560
3
4
1
0
Figure 85. Example of Output Filter for ED, 8× Oversampling
DAC
OUTPUT
390nH
33pF
33pF
75
500
300
75
BNC
OUTPUT
500
3
4
1
3
4
1
0
Figure 86. Example of Output Filter for HD, 4× Oversampling
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADV7341 | Multiformat Video Encoder, Six 12-Bit Noise Shaped Video㈢ DACS |
| ADV7341BSTZ | Multiformat Video Encoder, Six 12-Bit Noise Shaped Video㈢ DACS |
| ADV7341EBZ | Multiformat Video Encoder, Six 12-Bit Noise Shaped Video㈢ DACS |
| ADV7343BSTZ | Multiformat Video Encoder Six, 11-Bit, 297 MHz DACs |
| ADV7342 | Multiformat Video Encoder Six, 11-Bit, 297 MHz DACs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADV7341 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat Video Encoder, Six 12-Bit Noise Shaped Video㈢ DACS |
| ADV7341BSTZ | 制造商:Analog Devices 功能描述:Video Encoder 6DAC 12-Bit 64-Pin LQFP Tray 制造商:Analog Devices 功能描述:MULTI-FORMAT VIDEO ENCODER SIX 12-BIT NOISE SHAPED VIDEO DAC - Bulk |
| ADV7341EBZ | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat Video Encoder, Six 12-Bit Noise Shaped Video㈢ DACS |
| ADV7342 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat Video Encoder Six, 11-Bit, 297 MHz DACs |
| ADV7342BSTZ | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat Video Encoder Six, 11-Bit, 297 MHz DACs |
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