ADV7321KSTZ Analog Devices Inc, ADV7321KSTZ Datasheet - Page 62

• Manufacturer Part Number: ADV7321KSTZ
• Description: IC VID ENC 6-12BIT DAC'S 64LQFP
• Manufacturer: Analog Devices Inc
• Type: Video Encoderr

Specifications of ADV7321KSTZ

• Applications: EVD, DVD, SD/PS/HDTV
• Voltage - Supply, Analog: 2.5V
• Voltage - Supply, Digital: 2.5V
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Input Format: Digital
• Output Format: Analog
• Supply Voltage Range: 2.375V To 2.625V
• Operating Temperature Range: 0°C To +70°C
• Tv / Video Case Style: LQFP
• No. Of Pins: 64
• Msl: MSL 1 - Unlimited
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADV7320/ADV7321
BOARD DESIGN AND LAYOUT
DAC TERMINATION AND LAYOUT
CONSIDERATIONS
The ADV7320/ADV7321 contain an on-board voltage
reference. The ADV7320/ADV7321 can be used with an
external V
The R
and are used to control the full-scale output current and, therefore,
the DAC voltage output levels. For full-scale output, R
have a value of 3040 Ω. The R
R
VIDEO OUTPUT BUFFER AND OPTIONAL
OUTPUT FILTER
Output buffering on all six DACs is necessary to drive output
devices, such as SD or HD monitors. Analog Devices produces
a range of suitable op amps for this application, for example, the
AD8061. More information on line-driver buffering circuits is
given in the relevant op amps’ data sheets.
An optional analog reconstruction low-pass filter (LPF) may be
required as an anti-imaging filter if the ADV7320/ADV7321 are
connected to a device that requires this filtering.
The filter specifications vary with the application.
Table 38. External Filter Requirements
Application
SD
SD
PS
PS
HDTV
HDTV
OUTPUT
LOAD
DAC
SET
has a value of 300 Ω for full-scale output.
Figure 85. Example of Output Filter for SD, 16× Oversampling
resistors are connected between the R
600 Ω
REF
(AD1580).
10 μ H
22pF
Oversampling
2×
16×
1×
8×
1×
2×
600 Ω
SET
560 Ω
3
4
values should not be changed.
Cutoff
Frequency
(MHz)
>6.5
>6.5
>12.5
>12.5
>30
>30
560 Ω
1
SET
pins and AGND
75 Ω
Attenuation
–50 dB @
(MHz)
20.5
209.5
14.5
203.5
44.25
118.5
SET
BNC
OUTPUT
must
Rev. A | Page 62 of 88
Table 39. Possible Output Rates from the ADV7320/ADV7321
Input Mode Address
0x01, Bits 6 to 4
SD Only
PS Only
HDTV Only
OUTPUT
OUTPUT
DAC
300Ω
DAC
–10
–20
–30
–40
–50
–60
–70
–80
Figure 88. Example of Output Filter for HDTV, 2× Oversampling
Figure 86. Filter Plot for Output Filter for SD, 16× Oversampling
0
1M
3
4
Figure 87. Example of Output Filter for PS, 8× Oversampling
600 Ω
GROUP DELAY (Seconds)
1
6.8pF
4.7 μ H
6.8pF
CIRCUIT FREQUENCY RESPONSE
75Ω
10M
FREQUENCY (Hz)
470nH
33pF
600 Ω
PLL Address
0x00, Bit 1
Off
On
Off
On
Off
On
560 Ω
PHASE (Degrees)
3
4
220nH
82pF
100M
560 Ω
75Ω
MAGNITUDE (dB)
500Ω
1
3
4
75 Ω
Output Rate
(MHz)
27 (2×)
216 (16×)
27 (1×)
216 (8×)
74.25 (1×)
148.5 (2×)
500Ω
1
1G
0
–30
–60
–90
–120
–150
–180
–210
–240
OUTPUT
BNC
OUTPUT
BNC
24n
21n
18n
15n
12n
9n
6n
3n
0