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ADA4424-6ARUZ-RL

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
ADA4424-6
Rev. C | Page 9 of 16
TYPICAL PERFORMANCE CHARACTERISTICS
V
DD3
= 3.3 V, T
A
= 25°C, V
O
= 2.042 V p-p, R
L
= 150 Ω, dc-coupled outputs, unless otherwise noted. Charge pump configured as shown in
Figure 18.
10
–60
0.1
FREQUENCY (MHz)
NORMALIZED GAIN (dB)
110100
0
–10
–20
–30
–40
–50
Y
CVBS
C
08550-004
Figure 4. Frequency Response—SD Channels
0.1 1k
FREQUENCY (MHz)
NORMALIZED GAIN (dB)
1 10 100
HY Pb
Pr
10
–60
0
–10
–20
–30
–40
–50
08550-005
Figure 5. Frequency Response—ED Channels
10
–60
0.1 1k
FREQUENCY (MHz)
NORMALIZED GAIN (dB)
1 10 100
0
–10
–20
–30
–40
–50
Pr
Pb
HY
08550-006
Figure 6. Frequency Response—HD Channels
0.5
–1.0
0.1 100
FREQUENCY (MHz)
NORMALIZED GAIN (dB)
110
0
–0.5
C
Y/CVBS
08550-007
Figure 7. Frequency Response Peaking—SD Channels
0.5
–1.0
0.1 100
FREQUENCY (MHz)
NORMALIZED GAIN (dB)
110
0
–0.5
HY
Pr
Pb
08550-008
Figure 8. Frequency Response Peaking—ED Channels
0.5
–1.0
0.1 100
FREQUENCY (MHz)
NORMALIZED GAIN (dB)
110
0
–0.5
HY
Pb/Pr
08550-009
Figure 9. Frequency Response Peaking—HD Channels
ADA4424-6
Rev. C | Page 10 of 16
–
20
–80
0.1 100
FREQUENCY (MHz)
CROSSTALK (dB)
110
–30
–40
–50
–60
–70
ALL HOSTILE
REFERRED TO INPUT
CVBS_OUT
Y_OUT
C_OUT
08550-010
Figure 10. Crosstalk—SD Channels
45
0
0.1 100
FREQUENCY (MHz)
GROUP DELAY (ns)
110
40
35
30
25
20
15
10
5
Y_OUT, C_OUT
CVBS_OUT
08550-011
Figure 11. Group Delay—SD Channels
45
0
0.1 100
FREQUENCY (MHz)
GROUP DELAY (ns)
110
40
35
30
25
20
15
10
5
08550-012
Figure 12. Group Delay—HD Channels
–
20
–80
0.1 100
FREQUENCY (MHz)
CROSSTALK (dB)
110
–30
–40
–50
–60
–70
ALL HOSTILE
REFERRED TO INPUT
HPb_OUT, HPr_OUT
HY_OUT
08550-013
Figure 13. Crosstalk—ED and HD Channels
45
0
0.1 100
FREQUENCY (MHz)
GROUP DELAY (ns)
110
40
35
30
25
20
15
10
5
08550-014
Figure 14. Group Delay—ED Channels
–
40
–120
0.1 100
FREQUENCY (MHz)
INPUT-TO-OUTPUT ISOLATION (dB)
110
–50
–60
–70
–80
–90
–100
–110
V
IN
= 1.0V p-p
R
L
= 150
SD_ENABLE = 0
HD_ENABLE = 0
08550-015
Figure 15. Input-to-Output Isolation—All Channels
ADA4424-6
Rev. C | Page 11 of 16
APPLICATIONS INFORMATION
CVBS OUTPUT
The composite video signal (CVBS_OUT) is produced by
passively summing the Y and C channels (see Figure 1), after
amplification by their respective gain stages. Each signal
experiences a 6.2 dB loss from the passive summation and is
subsequently amplified by 6.2 dB in the fixed stage following
the summer. The net signal gain through the composite video
path is, therefore, 0 dB, and the resulting composite signal
present at the ADA4424-6 output is the sum of Y and C with
unity gain.
CORNER FREQUENCY SELECTION
The component channels of the ADA4424-6 allow for a 1 dB
filter corner frequency of either 25 MHz or 39 MHz/34 MHz.
The FC_SEL pin operates as described in Table 5.
Table 5. ED/HD Bandwidth Selection
FC_SEL (Pin 12) HD/ED −1 dB Corner Frequency (Typ)
Low (0) ED 25 MHz
High (1) HD 39 MHz (HY); 34 MHz (Pb, Pr)
INPUT DC OFFSET CANCELLATION
The luma channels (Y_IN, HY_IN) of the ADA4424-6 are capable
of detecting and cancelling dc input offsets of up to 1.1 V. Four
distinct modes of detection/cancellation are available. These are
selected via the MODE1 and MODE0 pins. The chroma (C_IN)
and color difference (HPb_IN, HPr_IN) inputs do not support
offset cancellation. It is recommended that these inputs be ac-
coupled.
Automatic Detection/Cancellation Mode
There are two modes of automatic operation. The primary mode
samples the input signal between the rising edge of the horizon-
tal sync pulse and the start of active video (back porch), averages
the value over the sampling interval, and subtracts it from the
output signal. This is the more accurate method and is able to
reduce the input-referred offsets to less than 25 mV.
An alternate method is available for copy-protected signals, where
sampling the back porch may not provide a reliable dc average.
This method detects the input negative sync tip, and clamps it
to a fixed value (−214 mV for SD, and −300 mV for ED/HD).
Sample intervals for SD and ED are shown in Figure 16, and
the HD sample intervals are shown in Figure 17.
BLACK LEVEL
SYNC TIP SAMPLE INTERVAL
BACK PORCH SAMPLE INTERVAL
0
8550-017
Figure 16. Back Porch and Sync Tip Sample Intervals (SD/ED)
BLACK LEVEL
SYNC TIP SAMPLE INTERVAL
BACK PORCH SAMPLE INTERVAL
08550-018
Figure 17. Back Porch and Sync Tip Sample Intervals (HD)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

ADA4424-6ARUZ-RL

Mfr. #:
Buy ADA4424-6ARUZ-RL
Manufacturer:
Analog Devices Inc.
Description:
Video ICs 6 CHl SD/ED/HD Video Filter Charge Pump
Lifecycle:
New from this manufacturer.
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