tda8777hl/33/c1 NXP Semiconductors, tda8777hl/33/c1 Datasheet - Page 6

• Manufacturer Part Number: tda8777hl/33/c1
• Description: Triple 10-bit Video Dac, Up To 330 Mhz Sample Frequency
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9. Limiting values
TDA8777_4
Product data sheet
8.2 Blanking and sync pulse insertion
An external reference resistor must be connected between pin RSET and analog ground.
This resistor sets the reference current which determines the analog output level, and is
specified to be 560 . This value allows a 1 V (p-p) output (video plus sync) into a 37.5
load, such as a double-terminated 75
The video signal (see
The values of SYNC and BLANK are latched on the rising edge of the clock signal. When
no sync and no blank are applied, the DAC can be used continuously. This is the so-called
generic mode.
Because the signal delay in the DAC is 1.5 times the clock period, the sync and blank are
also delayed by 1.5 times the clock period.
Table 4.
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
V
V
T
T
T
Fig 3. Video signal sync pulse and blanking period
•
•
•
stg
amb
j
DDA
n
The video information: defined by the 10 bits used to drive the DAC; nominal signal
amplitude = 700 mV (p-p)
The sync pulse: a horizontal synchronization (hsync) pulse indicates the end of a
video line and the start of the next video line; sync nominal amplitude = 300 mV; sync
is added to the video signal output via the SYNC input (active LOW)
The blanking period: allows interface-free detection of both sync and video, blanking
is allocated either side of the sync pulse; the blank level is equal to the video black
level; blanking is added to the video signal output via the BLANK input (active LOW).
Limiting values
Parameter
analog supply voltage
voltage on digital input pins
storage temperature
ambient temperature
junction temperature
Figure
0.7 V
0.3 V
Rev. 04 — 11 April 2006
Triple 10-bit video DAC, up to 330 MHz sample frequency
3) is comprised of the following three parts:
blanking period
sync pulse
Conditions
referred to V
referred to V
coaxial cable.
SSA1
SSA2
video information
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
mle291
Min
0
0.5
0.5
55
40
TDA8777
Max
+6.5
+5.5
+150
70
+125
Unit
V
V
C
C
C
6 of 18