ADV7342BSTZ Analog Devices Inc, ADV7342BSTZ Datasheet - Page 70

• Manufacturer Part Number: ADV7342BSTZ
• Manufacturer: Analog Devices Inc

Specifications of ADV7342BSTZ

• Number Of Dac's: 6
• Adc/dac Resolution: 11b
• Screening Level: Industrial
• Package Type: LQFP
• Pin Count: 64
• Lead Free Status / RoHS Status: Compliant

ADV7342/ADV7343
PRINTED CIRCUIT BOARD LAYOUT AND DESIGN
UNUSED PINS
If the S_HSYNC , S_VSYNC , P_HSYNC , and P_VSYNC pins are
not used, they should be tied to V
(10 kΩ or 4.7 kΩ). Any other unused digital inputs should be tied
to ground. Unused digital output pins should be left floating. DAC
outputs can be either left floating or connected to GND. Disabling
these outputs is recommended.
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
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
mode of operation for DAC 1, DAC 2, and DAC 3.
The ADV7342/ADV7343 contain two R
connected between the R
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
value of 300 Ω. For full-drive operation, R
of 510 Ω, and R
A resistor connected between the R
to control the full-scale output current and, therefore, the DAC
output voltage levels of DAC 4, DAC 5, and DAC 6. R
have a value of 4.12 kΩ, and R
is, low-drive operation only).
The resistors connected to the R
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
VOLTAGE REFERENCE
The ADV7342/ADV7343 contain an on-chip voltage reference
that can be used as a board-level voltage reference via the V
pin. Alternatively, the ADV7342/ADV7343 can be used with an
external voltage reference by connecting the reference source to
the V
reference such as the
external voltage reference is not used, a 0.1 μF capacitor should
be connected from the V
VIDEO OUTPUT BUFFER AND OPTIONAL
OUTPUT FILTER
An output buffer is necessary on any DAC that operates in low-
drive mode (R
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.
REF
pin. For optimal performance, use an external voltage
SET1
SETx
L
must have a value of 4.12 kΩ, and R
must have a value of 37.5 Ω.
= 4.12 kΩ, R
AD1580
REF
SET1
pin to V
pin and AGND is used to control
with the ADV7342/ ADV7343. If an
L
L
must have a value of 300 Ω (that
DD_IO
L
= 300 Ω). Analog Devices
SET1
. Full-drive is the recommended
SET2
and R
AA
through a pull-up resistor
.
pin and AGND is used
SET
SET2
SET1
AA
pins. A resistor
.
must have a value
pins should have a
L
must have a
SET2
must
L
.
REF
Rev. A | Page 70 of 104
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.
For applications requiring an output buffer and reconstruction
filter, the ADA4430-1, ADA4411-3, and
video filter buffers should be considered.
Table 59. ADV7342/ADV7343 Output Rates
Input Mode
(Subaddress 0x01,
Bits[6:4])
SD Only
ED Only
HD Only
Table 60. Output Filter Requirements
Application
SD
SD
ED
ED
HD
HD
OUTPUT
OUTPUT
DAC
DAC
Figure 86. Example of Output Filter for SD, 16× Oversampling
Figure 87. Example of Output Filter for ED, 8× Oversampling
600Ω
600Ω
10µH
22pF
Oversampling
2×
16×
1×
8×
1×
4×
6.8pF
4.7µH
6.8pF
PLL Control
(Subaddress
0x00, Bit 1)
Off
On
Off
On
Off
On
600Ω
600Ω
560Ω
560Ω
3
4
3
4
Cutoff
Frequency
(MHz)
>6.5
>6.5
>12.5
>12.5
>30
>30
560Ω
560Ω
ADA4410-6
Output Rate (MHz)
27
216
27
216
74.25
297
1
1
75Ω
75Ω
Attenuation
–50 dB at
(MHz)
20.5
209.5
14.5
203.5
44.25
267
integrated
(2x)
(16x)
(1x)
(8x)
(1x)
(4x)
BNC
OUTPUT
BNC
OUTPUT