ADV7340BSTZ Analog Devices Inc, ADV7340BSTZ Datasheet - Page 71

• Manufacturer Part Number: ADV7340BSTZ
• Manufacturer: Analog Devices Inc

Specifications of ADV7340BSTZ

• Number Of Dac's: 6
• Adc/dac Resolution: 12b
• Screening Level: Industrial
• Package Type: LQFP
• Pin Count: 64
• Lead Free Status / RoHS Status: Compliant

SLEEP MODE
Subaddress 0x00, Bit 0
In sleep mode, most of the digital I/O pins of the ADV7340/
ADV7341 are disabled. For inputs, this means that the external
data is ignored, and internally the logic normally driven by a
given input is just tied low or high. This includes CLKINx.
For digital output pins, this means that the pin goes into three-
state (high impedance) mode.
There are some exceptions to allow the user to continue to
communicate with the part via I
kept alive.
PIXEL AND CONTROL PORT READBACK
Subaddress 0x12 to Subaddress 0x16
The ADV7340/ADV7341 support the readback of most digital
inputs via the I
level connectivity testing with upstream devices.
The pixel port (S[9:0], Y[9:0], and C[9:0]), the control port
( S_HSYNC , S_VSYNC , P_HSYNC , P_VSYNC , and P_BLANK ),
and the SFL pin are available for readback via the MPU port.
The readback registers are located at Subaddress 0x12 to
Subaddress 0x16.
When using this feature, apply a clock signal to the CLKIN_A
pin in order to register the levels applied to the input pins.
RESET MECHANISM
Subaddress 0x17, Bit 1
The ADV7340/ADV7341 have a software reset accessible via
the I
a 1 to Subaddress 0x17, Bit 1. This resets all registers to their
default values. This bit is self-clearing; that is, after a 1 has been
written to the bit, the bit automatically returns to 0.
2
C MPU port. A software reset is activated by writing
2
C MPU port. This feature is useful for board-
TELETEXT VBI LINE
2
C: the SDA, and SCL pins are
Figure 84. Teletext VBI Line
Rev. A | Page 71 of 108
RUN-IN CLOCK
45 BYTES (360 BITS) – PAL
ADDRESS AND DATA
The ADV7340/ADV7341 include a power-on reset (POR)
circuit to ensure correct operation after power-up.
SD TELETEXT INSERTION
Subaddress 0xC9 to Subaddress 0xCE
The ADV7340/ADV7341 supports the insertion of teletext data,
using a 2-pin interface, when operating in PAL mode. Teletext
insertion is enabled using Subaddress 0xC9, Bit 0.
In accordance with the PAL WST teletext standard, teletext data
should be inserted into the ADV7340/ADV7341 at a rate of
6.9375 Mbps. The teletext data can be inserted on the
S_VSYNC , P_VSYNC , or C0 pin. The pin on which the teletext
data is inserted is selected using Subaddress 0xC9, Bits[3:2].
When teletext insertion is enabled, a teletext request signal is
output from the ADV7340/ADV7341 to indicate when teletext
data should be inserted. The teletext request signal is output on
the SFL pin. The position (relative to the teletext data) and
width of the request signal are configurable using Subaddress
0xCA. The request signal can operate in either line or bit mode.
The request signal mode is controlled using Subaddress 0xC9,
Bit 1.
To account for the noninteger relationship between the teletext
insertion rate (6.9375 Mbps) and the pixel clock (27 MHz), a
teletext insertion protocol is implemented in the ADV7340/
ADV7341. At a rate of 6.9375 Mbps, the time taken for the
insertion of 37 teletext bits equates to 144 pixel clock cycles (at
27 MHz). For every 37 teletext bits inserted into the ADV7340/
ADV7341, the 10
pixel clock cycles, and the remainder are carried for four pixel
clock cycles (totaling 144 pixel clock cycles). The teletext
insertion protocol repeats every 37 teletext bits or 144 pixel
clock cycles until all 360 teletext bits are inserted.
th
, 19
th
, 28
th,
and 37
ADV7340/ADV7341
th
bits are carried for three