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參數(shù)資料
| 型號： | ADV7342BSTZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | Multiformat Video Encoder Six, 11-Bit, 297 MHz DACs |
| 中文描述： | SERIAL INPUT LOADING, 11-BIT DAC, QFP64 |
| 封裝： | ROHS COMPLIANT, MS-026BCD, LQFP-64 |
| 文件頁數(shù)： | 65/88頁 |
| 文件大?。?/td> | 1053K |
| 代理商： | ADV7342BSTZ |
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ADV7342/ADV7343
PRINTED CIRCUIT BOARD LAYOUT AND DESIGN
DAC CONFIGURATIONS
The ADV7342/ADV7343 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 ADV7342/ADV7343 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 ADV7342/ADV7343 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 ADV7342/ADV7343 contain an on-chip voltage reference
that can be used as a board-level voltage reference via the V
REF
pin. Alternatively, the ADV7342/ADV7343 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 ADV7342/
ADV7343. 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 ADV7342/ADV7343 DAC outputs if
the ADV7342/ADV7343 are 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 65 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. ADV7342/ADV7343 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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADV7343 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat Video Encoder Six, 11-Bit, 297 MHz DACs |
| ADV7343BSTZ | 功能描述:IC ENCODER VIDEO W/DAC 64-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應(yīng)用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| ADV7343WBSTZ | 功能描述:IC ENCODER VID 12BIT DAC 64LQFP 制造商:analog devices inc. 系列:- 包裝:托盤 零件狀態(tài):在售 類型:視頻編碼器 應(yīng)用:DVD，Blu-Ray 電壓 - 電源，模擬:2.6 V ~ 3.46 V 電壓 - 電源，數(shù)字:1.71 V ~ 1.89 V 安裝類型:表面貼裝 封裝/外殼:64-LQFP 供應(yīng)商器件封裝:64-LQFP（10x10） 標準包裝:1 |
| ADV7343WBSTZ-RL | 功能描述:Video Encoder IC DVD, Blu-Ray 64-LQFP (10x10) 制造商:analog devices inc. 系列:- 包裝:帶卷（TR） 零件狀態(tài):有效 類型:視頻編碼器 應(yīng)用:DVD，Blu-Ray 電壓 - 電源，模擬:2.6 V ~ 3.46 V 電壓 - 電源，數(shù)字:1.71 V ~ 1.89 V 安裝類型:表面貼裝 封裝/外殼:64-LQFP 供應(yīng)商器件封裝:64-LQFP（10x10） 標準包裝:1,500 |
| ADV7344 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat Video Encoder Six 14-Bit Noise Shaped Video DACs |
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