• No deglitching circuit required
SYNC and BLANK control inputs
•
• 0.66 V output voltage range on red and blue channels
• 1 V output voltage range on green channel
(including sync)
• BLANK control input on the 3 channels
• + 5 V power supply.
TDA8775
APPLICATIONS
• General purpose high-speed digital-to-analog
conversion
• Digital TV
• Graphic display
• Desktop video processing.
GENERAL DESCRIPTION
The TDA8775 consists of three 10-bit video
Digital-to-Analog Converters (DACs). They convert the
digital input signals into current outputs at a maximum
conversion rate of 50 MHz.
The DACs are based on current source architecture with
selectable current reference.
The devices are fabricated in a 5 V CMOS process that
ensures high functionality with low power dissipation.
QUICK REFERENCE DATA
SYMBOLPARAMETERCONDITIONSMIN.TYP.MAX.UNIT
V
V
I
DDA
I
DDD
DDA
DDD
analog supply voltage4.55.05.5V
digital supply voltage4.55.05.5V
analog supply currentSLT = 1; RL= 37.5 Ω−67tbfmA
SLT = 0; R
= 150 Ω−16tbfmA
L
digital supply currentSLT = 1; RL= 37.5 Ω−15tbfmA
SLT = 0; R
= 150 Ω−10tbfmA
L
INLDC integral non-linearity−±1±2LSB
DNLDC differential non-linearity−±0.7±1.0LSB
f
Triple 10-bit video Digital-to-Analog
Converter (DAC)
BLOCK DIAGRAM
V
handbook, full pagewidth
red
digital inputs
(bits R0 to R3)
red
digital inputs
(bits R4 to R9)
green
digital inputs
(bits G0 to G3)
DDA1VDDA2VDDA3
10-7
TDA8775
6-1
24-21
TDA8775
V
DDD1
4
LSB
DECODER
6
MSB
DECODER
CURRENT
SOURCE
4
V
DDD2
11454138
37
25
CLK
46
OUTR
green
digital inputs
(bits G4 to G9)
blue
digital inputs
(bits B0 to B3)
blue
digital inputs
(bits B4 to B9)
BLANK
control input
SYNC
control input
20-15
35-32
31-26
14
13
6
6
CONTROL
REGISTER
LSB
DECODER
MSB
DECODER
MSB
DECODER
48391236
SLTreference current
CURRENT
SOURCE
4
LSB
DECODER
CURRENT
SOURCE
CURRENT
REFERENCE
decoupling input
(I
)
ref
V
SSD1VSSD2
44
OUTG
47
VSSA3
43
VSSA2
40
VSSA1
42
OUTB
MGE965
Fig.1 Block diagram.
1996 Aug 143
Page 4
Philips SemiconductorsPreliminary specification
Triple 10-bit video Digital-to-Analog
Converter (DAC)
PINNING
SYMBOLPINDESCRIPTION
R91red digital input data; bit 9 (MSB)
R82red digital input data; bit 8
R73red digital input data; bit 7
R64red digital input data; bit 6
R55red digital input data; bit 5
R46red digital input data; bit 4
R37red digital input data; bit 3
R28red digital input data; bit 2
R19red digital input data; bit 1
R010red digital input data; bit 0 (LSB)
V
DDD1
V
SSD1
SYNC13composite sync control input; for green channel only (active LOW)
BLANK14composite blank control input (active LOW)
G915green digital input data; bit 9 (MSB)
G816green digital input data; bit 8
G717green digital input data; bit 7
G618green digital input data; bit 6
G519green digital input data; bit 5
G420green digital input data; bit 4
G321green digital input data; bit 3
G222green digital input data; bit 2
G123green digital input data; bit 1
G024green digital input data; bit 0 (LSB)
CLK25clock input
B926blue digital input data; bit 9 (MSB)
B827blue digital input data; bit 8
B728blue digital input data; bit 7
B629blue digital input data; bit 6
B530blue digital input data; bit 5
B431blue digital input data; bit 4
B332blue digital input data; bit 3
B233blue digital input data; bit 2
B134blue digital input data; bit 1
B035blue digital input data; bit 0 (LSB)
V
SSD2
V
DDD2
V
DDA1
I
ref
V
SSA1
11digital supply voltage 1
12digital supply ground 1
36digital supply ground 2
37digital supply voltage 2
38analog supply voltage 1
39decoupling pin for reference current
40analog supply ground 1
TDA8775
1996 Aug 144
Page 5
Philips SemiconductorsPreliminary specification
Triple 10-bit video Digital-to-Analog
Converter (DAC)
SYMBOLPINDESCRIPTION
V
DDA2
OUTB42blue analog output
V
SSA2
OUTG44green analog output
V
DDA3
OUTR46red analog output
V
SSA3
SLT48mode selection; normal mode, R
41analog supply voltage 2
43analog supply ground 2
45analog supply voltage 3
47analog supply ground 3
RL= 150 Ω (active LOW)
= 37.5 Ω (active HIGH); low power mode,
L
TDA8775
handbook, full pagewidth
V
DDD1
V
SSD1
R9
R8
R7
R6
R5
R4
R3
R2
R1
R0
SSA2
43
18
G6
OUTB
42
19
G5
DDA2
V
41
20
G4
V
40
21
V
47
14
BLANK
46
15
G9
V
45
16
G8
OUTG
V
44
TDA8775
17
G7
SLT
48
1
2
3
4
5
6
7
8
9
10
11
12
13
SYNC
DDA3
SSA3
OUTR
SSA1
G3
I
ref
39
22
G2
DDA1
V
38
23
G1
DDD2
V
2437
G0
36
35
34
33
32
31
30
29
28
27
26
25
MGE964
V
SSD2
B0
B1
B2
B3
B4
B5
B6
B7
B8
B9
CLK
Fig.2 Pin configuration.
1996 Aug 145
Page 6
Philips SemiconductorsPreliminary specification
Triple 10-bit video Digital-to-Analog
TDA8775
Converter (DAC)
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOLPARAMETERMIN.MAX.UNIT
V
DDA
V
DDD
∆V
DD
T
stg
T
amb
T
j
THERMAL CHARACTERISTICS
SYMBOLPARAMETERVALUE (TYP.)UNIT
R
th j-a
HANDLING
Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is
desirable to take normal precautions appropriate to handling integrated circuits.
analog supply voltage−0.5+6.5V
digital supply voltage−0.5+6.5V
supply voltage difference between V
Triple 10-bit video Digital-to-Analog
Converter (DAC)
TIMING
ndbook, full pagewidth
data input
clock input
t
CPL
stable
t
HD; DAT
t
SU; DAT
Fig.4 Input timing.
t
CPH
MBB656 - 1
TDA8775
V
IH
50 %
V
IL
50 %
V
IL
handbook, full pagewidth
(1) Output level conditions, SYNC = 0; BLANK = 1.
clock input
input code
(example of a
full-scale input
data transition)
code 1023
50 %
714 mV
(code 1023)
(1)
V
o
code 0
1 LSB
10 %
t
d
t
s1
t
s2
50 %
90 %
1 LSB
MBB662 - 3
54 mV
(code 0)
Fig.5 Switching timing.
1996 Aug 149
Page 10
Philips SemiconductorsPreliminary specification
Triple 10-bit video Digital-to-Analog
Converter (DAC)
INTERNAL PIN CIRCUITRY
handbook, full pagewidth
V
DDD
GND
V
SSD
(a) Digital inputs; pins 1 to 10, 13 to 25 and 26 to 35.
(b) I
; pin 39.
ref
(c) OUTR, OUTG and OUTB; pins 46, 44 and 42.
V
SSA
(b)(c)(a)
V
DDA
TDA8775
V
DDA
bit
n
V
SSA
bit
n
MGE967
Fig.6 Internal circuitry.
1996 Aug 1410
Page 11
Philips SemiconductorsPreliminary specification
Triple 10-bit video Digital-to-Analog
Converter (DAC)
APPLICATION INFORMATION
handbook, full pagewidth
R = 37.5 Ω or 150 Ω
+5 V
+5 V
red
input
100 nF
(1)
(2)
1
2
3
4
5
6
7
8
9
10
11
12
13 14 15 16 17 18 19 20 21 22 23 24
R
+5 V
100 nF
RR
TDA8775
22
nF
22
nF
+5 V
+5 V
373839404641424344454748
100 nF
36
35
34
33
32
31
30
29
28
27
26
25
TDA8775
blue
input
CLK
green input
Analog and digital supplies should be separated and decoupled.
Supplies are not connected internally.
All ground pins must be connected. One ground plane is preferred although it depends on the application.
(1) R = 37.5 Ω; SLT = 1.
(2) R = 150 Ω; SLT = 0.
Fig.7 Application diagram.
1996 Aug 1411
MGE966
Page 12
Philips SemiconductorsPreliminary specification
Triple 10-bit video Digital-to-Analog
Converter (DAC)
handbook, full pagewidth
video outputs
from TDA8775
2.7
µH
75 Ω
R1
75
R2
180
Ω
pF
3.3 µH
27 pF
330 pF
330 pF
R3
TDA8775
video
output
75 Ω
MGE968
handbook, full pagewidth
att
(dB)
0
−10
−20
−30
−40
0520
Fig.8 Example of reconstruction filter for 1 V output swing.
(1)
(2)
1015
f (MHz)
MGE969
25
(1) R2 = 75 Ω.
(2) R2 = 0 Ω.
Fig.9 Frequency response for filter shown in Fig.8.
1996 Aug 1412
Page 13
Philips SemiconductorsPreliminary specification
Triple 10-bit video Digital-to-Analog
Converter (DAC)
PACKAGE OUTLINE
LQFP48: plastic low profile quad flat package; 48 leads; body 7 x 7 x 1.4 mm
c
y
X
36
37
25
Z
24
E
A
TDA8775
SOT313-2
e
w M
pin 1 index
48
1
e
DIMENSIONS (mm are the original dimensions)
mm
A
A1A2A3b
max.
0.20
1.60
0.05
1.45
1.35
UNIT
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
b
p
0.25
w M
D
H
D
p
0.27
0.17
12
Z
D
(1)(1)(1)
cE
D
0.18
7.1
0.12
6.9
b
p
13
v M
B
v M
02.55 mm
scale
(1)
eH
H
7.1
6.9
0.5
9.15
8.85
D
E
A
B
9.15
8.85
H
E
LLpQZywv θ
E
0.75
0.45
A
2
A
A
1
detail X
0.69
0.59
0.120.10.21.0
Q
(A )
3
θ
L
p
L
Z
E
D
0.95
0.55
o
7
o
0
0.95
0.55
OUTLINE
VERSION
SOT313-2
IEC JEDEC EIAJ
REFERENCES
1996 Aug 1413
EUROPEAN
PROJECTION
ISSUE DATE
93-06-15
94-12-19
Page 14
Philips SemiconductorsPreliminary specification
Triple 10-bit video Digital-to-Analog
Converter (DAC)
SOLDERING
Introduction
There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.
This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our
“IC Package Databook”
Reflow soldering
Reflow soldering techniques are suitable for all LQFP
packages.
Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.
Several techniques exist for reflowing; for example,
thermal conduction by heated belt. Dwell times vary
between 50 and 300 seconds depending on heating
method. Typical reflow temperatures range from
215 to 250 °C.
Preheating is necessary to dry the paste and evaporate
the binding agent. Preheating duration: 45 minutes at
45 °C.
Wave soldering
Wave soldering is not recommended for LQFP packages.
This is because of the likelihood of solder bridging due to
closely-spaced leads and the possibility of incomplete
solder penetration in multi-lead devices.
(order code 9398 652 90011).
TDA8775
If wave soldering cannot be avoided, the following
conditions must be observed:
• A double-wave (a turbulent wave with high upward
pressure followed by a smooth laminar wave)
soldering technique should be used.
• The footprint must be at an angle of 45° to the board
direction and must incorporate solder thieves
downstream and at the side corners.
Even with these conditions, do not consider wave
soldering LQFP packages LQFP48 (SOT313-2),
LQFP64 (SOT314-2) or LQFP80 (SOT315-1).
During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.
Maximum permissible solder temperature is 260 °C, and
maximum duration of package immersion in solder is
10 seconds, if cooled to less than 150 °C within
6 seconds. Typical dwell time is 4 seconds at 250 °C.
A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.
Repairing soldered joints
Fix the component by first soldering two diagonallyopposite end leads. Use only a low voltage soldering iron
(less than 24 V) applied to the flat part of the lead. Contact
time must be limited to 10 seconds at up to 300 °C. When
using a dedicated tool, all other leads can be soldered in
one operation within 2 to 5 seconds between
270 and 320 °C.
1996 Aug 1414
Page 15
Philips SemiconductorsPreliminary specification
Triple 10-bit video Digital-to-Analog
TDA8775
Converter (DAC)
DEFINITIONS
Data sheet status
Objective specificationThis data sheet contains target or goal specifications for product development.
Preliminary specificationThis data sheet contains preliminary data; supplementary data may be published later.
Product specificationThis data sheet contains final product specifications.
Limiting values
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information
Where application information is given, it is advisory and does not form part of the specification.
LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.
1996 Aug 1415
Page 16
Philips Semiconductors – a worldwide company
Argentina: see South America
Australia: 34 Waterloo Road, NORTH RYDE, NSW 2113,
United States: 811 East Arques Avenue, SUNNYVALE, CA 94088-3409,
Tel. +1 800 234 7381
Uruguay: see South America
Vietnam: see Singapore
Yugoslavia: PHILIPS, Trg N. Pasica 5/v, 11000 BEOGRAD,
Tel. +381 11 825 344, Fax.+381 11 635 777
For all other countries apply to: Philips Semiconductors, Marketing & Sales Communications,
Building BE-p, P.O. Box 218, 5600 MD EINDHOVEN, The Netherlands, Fax. +31 40 27 24825
The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed
without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license
under patent- or other industrial or intellectual property rights.
Internet: http://www.semiconductors.philips.com
Printed in The Netherlands537021/50/01/pp16 Date of release: 1996 Aug 14Document order number: 9397 75001021
Loading...
+ hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.