Philips tda8775 DATASHEETS
INTEGRATED CIRCUITS
DATA SH EET
TDA8775
Triple 10-bit video Digital-to-Analog
Converter (DAC)
Preliminary specification
File under Integrated Circuits, IC02
1996 Aug 14
Philips Semiconductors Preliminary specification
Triple 10-bit video Digital-to-Analog
Converter (DAC)
FEATURES
• 10-bit resolution
• Sampling rate up to:
– 50 MHz for normal mode; RL= 37.5 Ω
– 35 MHz for LOW power mode; RL= 150 Ω
• Internal current reference
• Current reference selector for:
– normal mode, RL= 37.5 Ω (typ.)
– low-power mode, RL= 150 Ω (typ.)
• 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
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
V
I
DDA
I
DDD
DDA
DDD
analog supply voltage 4.5 5.0 5.5 V
digital supply voltage 4.5 5.0 5.5 V
analog supply current SLT = 1; RL= 37.5 Ω−67 tbf mA
SLT = 0; R
= 150 Ω−16 tbf mA
L
digital supply current SLT = 1; RL= 37.5 Ω−15 tbf mA
SLT = 0; R
= 150 Ω−10 tbf mA
L
INL DC integral non-linearity −±1±2 LSB
DNL DC differential non-linearity −±0.7 ±1.0 LSB
f
clk(max)
P
tot
maximum clock frequency SLT = 1; RL= 37.5 Ω 50 −−MHz
SLT = 0; R
total power dissipation SLT = 1; RL= 37.5 Ω;
f
=50MHz
clk
SLT = 0; R
f
=35MHz
clk
= 150 Ω 35 −−MHz
L
− 410 tbf mW
= 150 Ω;
L
− 130 tbf mW
ORDERING INFORMATION
TYPE
NUMBER
NAME DESCRIPTION VERSION
PACKAGE
TDA8775G LQFP48 plastic low profile quad flat package; 48 leads; body 7 × 7 × 1.4 mm SOT313-2
1996 Aug 14 2
Philips Semiconductors Preliminary specification
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
48 39 12 36
SLT reference 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 14 3
Philips Semiconductors Preliminary specification
Triple 10-bit video Digital-to-Analog
Converter (DAC)
PINNING
SYMBOL PIN DESCRIPTION
R9 1 red digital input data; bit 9 (MSB)
R8 2 red digital input data; bit 8
R7 3 red digital input data; bit 7
R6 4 red digital input data; bit 6
R5 5 red digital input data; bit 5
R4 6 red digital input data; bit 4
R3 7 red digital input data; bit 3
R2 8 red digital input data; bit 2
R1 9 red digital input data; bit 1
R0 10 red digital input data; bit 0 (LSB)
V
DDD1
V
SSD1
SYNC 13 composite sync control input; for green channel only (active LOW)
BLANK 14 composite blank control input (active LOW)
G9 15 green digital input data; bit 9 (MSB)
G8 16 green digital input data; bit 8
G7 17 green digital input data; bit 7
G6 18 green digital input data; bit 6
G5 19 green digital input data; bit 5
G4 20 green digital input data; bit 4
G3 21 green digital input data; bit 3
G2 22 green digital input data; bit 2
G1 23 green digital input data; bit 1
G0 24 green digital input data; bit 0 (LSB)
CLK 25 clock input
B9 26 blue digital input data; bit 9 (MSB)
B8 27 blue digital input data; bit 8
B7 28 blue digital input data; bit 7
B6 29 blue digital input data; bit 6
B5 30 blue digital input data; bit 5
B4 31 blue digital input data; bit 4
B3 32 blue digital input data; bit 3
B2 33 blue digital input data; bit 2
B1 34 blue digital input data; bit 1
B0 35 blue digital input data; bit 0 (LSB)
V
SSD2
V
DDD2
V
DDA1
I
ref
V
SSA1
11 digital supply voltage 1
12 digital supply ground 1
36 digital supply ground 2
37 digital supply voltage 2
38 analog supply voltage 1
39 decoupling pin for reference current
40 analog supply ground 1
TDA8775
1996 Aug 14 4
Philips Semiconductors Preliminary specification
Triple 10-bit video Digital-to-Analog
Converter (DAC)
SYMBOL PIN DESCRIPTION
V
DDA2
OUTB 42 blue analog output
V
SSA2
OUTG 44 green analog output
V
DDA3
OUTR 46 red analog output
V
SSA3
SLT 48 mode selection; normal mode, R
41 analog supply voltage 2
43 analog supply ground 2
45 analog supply voltage 3
47 analog 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
24 37
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 14 5
Loading...