AD723ARUZ Analog Devices Inc, AD723ARUZ Datasheet

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AD723ARUZ

Manufacturer Part Number
AD723ARUZ
Description
IC ENCODER RGB-NTSC/PAL 28-TSSOP
Manufacturer
Analog Devices Inc
Type
Video Encoderr
Datasheet

Specifications of AD723ARUZ

Applications
Cameras, Internet Appliances, Set-Top Boxes
Voltage - Supply, Digital
2.7 V ~ 5.5 V
Mounting Type
Surface Mount
Package / Case
28-TSSOP
Screening Level
Industrial
Package Type
TSSOP
Pin Count
28
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Supply, Analog
-
Lead Free Status / RoHS Status
Compliant, Lead free / RoHS Compliant

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Part Number
Manufacturer
Quantity
Price
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AD723ARUZ
Manufacturer:
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Quantity:
20 000
Part Number:
AD723ARUZ-REEL
Manufacturer:
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Part Number:
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a
PRODUCT DESCRIPTION
The AD723 is a low cost RGB-to-NTSC/PAL encoder that
converts analog red, green, and blue color component signals
into their corresponding luminance and chrominance signals for
display on an NTSC or PAL television. Luminance (Y) and
Chrominance (C) signals are available individually for S-video,
TERM
4FSC
HSYNC
VSYNC
TRIPLE INPUT
TERMINATION
RT
GT
BT
RIN
GIN
BIN
GND
GND
GND
CLAMP
CLAMP
CLAMP
DC
DC
DC
RGB-TO-YUV
ENCODING
MATRIX
2.7 V to 5.5 V RGB-to-NTSC/PAL Encoder with
QUADRATURE
SEPARATOR
DECODER
FUNCTIONAL BLOCK DIAGRAM
SYNC
Load Detect and Input Termination Switch
Y
U
V
4-POLE
4-POLE
4-POLE
CSYNC
BURST
BURST
LPF
LPF
LPF
FSC
BURST
CSYNC
or combined for composite video (CV). All outputs are avail-
able separately and optimized for driving 75 Ω loads. Active
termination is used for lower power consumption.
A smart load detect feature powers down unused outputs and
can be used to monitor the continuing presence or absence of
an external TV. This enables plug-and-play operation. In addition,
a logic controlled triple switch at the input solves the applica-
tions problem of differing load conditions when an RGB monitor
is disconnected. When an RGB monitor is not present, the R,
G, and B terminations are enabled by the user. This solution
ensures no loss of video bandwidth when the RGB monitor is
in operation.
In PC applications, flicker filter support is provided by the
graphics controller, which has direct access to memory. Under-
scan compensation, necessary for uses other than video or
DVD, is supported through choice of RGB output clocks and
sync intervals.
An optional luminance trap (YTRAP) provides a means of
reducing cross color artifacts due to subcarrier frequency infor-
mation in the Y signal.
The AD723 is available in a 28-lead TSSOP package and is
capable of operation from supplies of 2.7 V to 5.5 V.
SIN
MODULATORS
8FSC CLK
BALANCED
COS
DELAY LINE
STND
LUMA
AD723
CE
4-POLE
4-POLE
LPF
LPF
TV DETECT
LUMA
TRAP
CURRENT OUTPUT DRIVERS
WITH SMART LOAD DETECT
RESISTORS
CHROMINANCE
GAIN SET
COMPOSITE
LUMINANCE
AD723
Y TRAP
CVSET
CSET
YSET
CV
C
Y

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AD723ARUZ Summary of contents

Page 1

PRODUCT DESCRIPTION The AD723 is a low cost RGB-to-NTSC/PAL encoder that converts analog red, green, and blue color component signals into their corresponding luminance and chrominance signals for display on an NTSC or PAL television. Luminance (Y) and Chrominance ...

Page 2

AD723–SPECIFICATIONS inputs terminated with 75 . Outputs configured in active termination mode, 75 Parameter SIGNAL INPUTS (RIN, GIN, BIN) Input Amplitude Clamp Level Input Resistance Input Capacitance TERMINATION SWITCH CHARACTERISTICS (RT, GT, BT) Input Capacitance Switch On Resistance LOGIC INPUTS ...

Page 3

ABSOLUTE MAXIMUM RATINGS Supply Voltage, AVDD to AGND . . . . . . . . . . . . . . . . . . . 6 V Supply Voltage, DVDD to DGND . . . . . . ...

Page 4

AD723 Pin Mnemonic Description 1 STND Encoding Standard Pin. A Logic HIGH signal is used for NTSC encoding, a Logic LOW signal signifies PAL When SA is high, phase alternation accompanies NTSC bandwidths and timing for support of ...

Page 5

FSC (3.579545MHz OR 4.433618MHz) OSCILLATOR 1.0 0.5 0.0 APL = 51.2% 525 LINE NTSC NO FILTERING SLOW CLAMP TO 0.0V @ 6.63 s –0 µs NOISE REDUCTION: 15.05dB APL = 50.7% SETUP 7.5% Typical Performance ...

Page 6

AD723 1.0 APL = 46.6% 525 LINE NTSC NO FILTERING SLOW CLAMP TO 0.00V @ 6.63 s 0.5 0.0 –0 200mV 1.0 APL = 34.8% 625 LINE PAL NO FILTERING SLOW CLAMP TO 0.00V ...

Page 7

APL = 48.2% 525 LINE NTSC NO FILTERING SLOW CLAMP TO 0.00V @ 6.63 s 0.5 0.0 –0 TIMING MEASUREMENT RS–170A (NTSC) FIELD = 1 LINE = 21 9.30 s 5.46 s ...

Page 8

AD723 THEORY OF OPERATION The AD723 is a predominantly analog design, with digital logic control of timing. This timing logic is driven by an external frequency reference at four times the color subcarrier frequency, input into the 4FSC pin of ...

Page 9

After the luma prefilter, the bandlimited luma signal is sampled onto a set of capacitors at twice the master reference clock rate. After an appropriate delay, the data is read from the delay line, reconstructing the luma signal. The 8FSC ...

Page 10

AD723 Current Mode Output Drivers In order to deliver a full swing video signal from a supply voltage as low as 2.7 V, the AD723 uses current mode output drivers. Bright colors like fully saturated yellow can reach peak ampli- ...

Page 11

Power-Down Load Checking One of the main uses of the TVDET signal is for plug-and-play operation. When this feature is used, a VGA controller or other IC polls the AD723 at regular intervals (such as once per second) to see ...

Page 12

AD723 HSYNC/VSYNC (USER INPUTS) RIN/GIN BIN (USER INPUTS) MODULATOR RESTORE INPUT CLAMPS BURST FLAG/ DELAY LINE RESET Y C Symbol Name Description t Sync Width Input valid sync width for burst SW insertion (user-controlled). t Sync to Blanking Minimum sync ...

Page 13

APPLYING THE AD723 Inputs RIN, BIN, GIN are analog inputs that should be terminated to ground with 75 Ω in close proximity to the IC. These connect directly to ground for direct input termination as in Figure 7. For switched ...

Page 14

AD723 Basic Connections Some simple applications will not require use of all of the fea- tures of the AD723. In such a case, some of the pins must be connected to appropriate levels such that the rest of the device ...

Page 15

V CC ESD PROTECTION RED GREEN BLUE GRAPHICS SUBSYSTEM HSYNC VSYNC DDCSCL 5V DDCSDL 5V 75 0.1 F GPO CE GPO TERM GPI I/O TVDET CONTROLLER GPO SA GPO STND OPTIONAL R1 1M U1A U1B HC04 HC04 R2 Y1 200 ...

Page 16

AD723 One well-known distortion of composite video images is called dot crawl. It shows moving dot pattern at the interface between two areas of different color caused by the inability of the monitor circuitry to ...

Page 17

Synchronous vs. Asynchronous Operation The source of RGB video and synchronization used as an input to the AD723 in some systems is derived from the same clock signal as used for the AD723 subcarrier input (4FSC). These systems are said ...

Page 18

AD723 Implementing a Luma Trap The AD723 implementation of a luma trap uses an on-chip resistor along with an off-chip inductor and capacitor to create an RLC notch filter. The filter must be tuned to the center frequency of the ...

Page 19

SYNCHRONIZING SIGNALS The AD723 requires explicit horizontal and vertical synchroniz- ing signals for proper operation. This information cannot and should not be incorporated in any of the RGB signals. However, the synchronizing information can be provided as either separate horizontal ...

Page 20

AD723 PIN 1 0.006 (0.15) 0.002 (0.05) SEATING PLANE OUTLINE DIMENSIONS Dimensions shown in inches and (mm). (mm) are the controlling dimension. 28-Lead TSSOP (RU-28) 0.386 (9.80) 0.378 (9.60 0.177 (4.50) 0.169 (4.30) 0.256 (6.50) 0.246 (6.25) 1 ...

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