TDA8777
Triple 10-bit video DAC, up to 330 MHz sample frequency
Rev. 04 — 11 April 2006
Product data sheet
1. General description
The TDA8777 consists of three separate 10-bit video Digital-to-Analog Converters (DACs)
with complementary outputs. They convert the digital input signals into analog current
outputs at a maximum conversion rate of 330 MHz.
The DACs are based on current source architecture.
A sync pulse can be added to the green signal (sync-on-green) to allow devices driven by
the video DAC to be synchronized.
The TDA8777 has a Power-down mode to reduce power consumption during inactive
periods.
The TDA8777 is fabricated in a CMOS process that ensures high functionality with low
power dissipation.
2. Features
I
I
I
I
I
I
I
I
I
I
I
Triple 10-bit DAC
Sampling frequency up to 330 MHz
Internal voltage reference (1.21 V)
Complementary outputs
Direct drive of double terminated 75
Ω
load into standard level
TTL compatible input
Sync and blank control inputs
Analog output current source
Power-down mode
3.3 V power supply
LQFP48 package
3. Applications
I
I
I
I
PC video cards
High resolution image processing
Digital video systems
General purpose high-speed digital-to-analog conversion
Philips Semiconductors
TDA8777
Triple 10-bit video DAC, up to 330 MHz sample frequency
4. Quick reference data
Table 1.
Symbol
V
DDA
I
DDA
INL
DNL
f
CLK
Quick reference data
Parameter
analog supply voltage
analog supply current
integral non-linearity
differential non-linearity
clock frequency
TDA8777HL/14/C1
TDA8777HL/24/C1
TDA8777HL/33/C1
P
tot
I
pd
total power dissipation
current in Power-down mode
-
-
-
-
-
-
-
-
297
20
140
240
330
-
-
MHz
MHz
MHz
mW
mA
Conditions
Min
3.0
-
−2
−1
Typ
3.3
90
-
-
Max
3.6
-
+2
+1
Unit
V
mA
LSB
LSB
5. Ordering information
Table 2.
Ordering information
Package
Name
TDA8777HL/14/C1
TDA8777HL/24/C1
TDA8777HL/33/C1
LQFP48
Description
plastic low profile quad flat package;
48 leads; body 7
×
7
×
1.4 mm
Version
Sampling
frequency
Type number
SOT313-2 140 MHz
240 MHz
330 MHz
TDA8777_4
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 04 — 11 April 2006
2 of 18
Philips Semiconductors
TDA8777
Triple 10-bit video DAC, up to 330 MHz sample frequency
6. Block diagram
V
SSA2
V
SSA1
PSAVE
RSET
COMP
V
DDA3
V
DDA2
V
DDA1
48-39
red digital
inputs
(bits R9 to R0)
10-1
30
29
13
POR
26
25
38
37
35
36
TDA8777
10
CURRENT/VOLTAGE REFERENCE
Vref + Iref
I
ref
34
10-BIT DAC
Vref + Iref
33
VREF
10
10
OUTR
OUTR
green digital
inputs
(bits G9 to G0)
10
TRIPLE
MULTI-
PLEXER
10
BLANKING 10
INSERT
32
10-BIT DAC
SYNC
INSERT
31
OUTG
OUTG
Vref + Iref
23-14
blue digital
inputs
(bits B9 to B0)
10
10
10
10-BIT DAC
sync
DAC CONTROL MODULE
24
CLK
11
BLANK
12
SYNC
28
27
OUTB
OUTB
mle290
Fig 1. Block diagram
TDA8777_4
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 04 — 11 April 2006
3 of 18
Philips Semiconductors
TDA8777
Triple 10-bit video DAC, up to 330 MHz sample frequency
7. Pinning information
7.1 Pinning
38 PSAVE
G0
G1
G2
G3
G4
G5
G6
G7
G8
1
2
3
4
5
6
7
8
9
37 RSET
36 VREF
35 COMP
34 OUTR
33 OUTR
32 OUTG
31 OUTG
30 V
DDA3
29 V
DDA2
28 OUTB
27 OUTB
26 V
SSA2
25 V
SSA1
CLK 24
001aad432
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
48 R9
47 R8
46 R7
45 R6
44 R5
43 R4
42 R3
41 R2
B6 20
40 R1
B7 21
TDA8777HL
G9 10
BLANK 11
SYNC 12
V
DDA1
13
B0 14
B1 15
B2 16
B3 17
B4 18
B5 19
B8 22
B9 23
Fig 2. Pin configuration
7.2 Pin description
Table 3.
Symbol
G0
G1
G2
G3
G4
G5
G6
G7
G8
G9
BLANK
SYNC
V
DDA1
B0
B1
B2
TDA8777_4
Pin description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Description
green digital input data; bit 0 (LSB)
green digital input data; bit 1
green digital input data; bit 2
green digital input data; bit 3
green digital input data; bit 4
green digital input data; bit 5
green digital input data; bit 6
green digital input data; bit 7
green digital input data; bit 8
green digital input data; bit 9 (MSB)
composite blank control input (active LOW)
composite sync control input; for green channel only (active LOW)
analog supply voltage 1
blue digital input data; bit 0 (LSB)
blue digital input data; bit 1
blue digital input data; bit 2
Product data sheet
Rev. 04 — 11 April 2006
39 R0
4 of 18
Philips Semiconductors
TDA8777
Triple 10-bit video DAC, up to 330 MHz sample frequency
Pin description
…continued
Pin
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
Description
blue digital input data; bit 3
blue digital input data; bit 4
blue digital input data; bit 5
blue digital input data; bit 6
blue digital input data; bit 7
blue digital input data; bit 8
blue digital input data; bit 9 (MSB)
clock input
analog supply ground 1
analog supply ground 2
complementary blue current analog output
blue current analog output
analog supply voltage 2
analog supply voltage 3
complementary green current analog output
green current analog output
complementary red current analog output
red current analog output
compliance voltage output
voltage reference input
full-scale current control resistor pin
power-save control input (active LOW)
red digital input data; bit 0 (LSB)
red digital input data; bit 1
red digital input data; bit 2
red digital input data; bit 3
red digital input data; bit 4
red digital input data; bit 5
red digital input data; bit 6
red digital input data; bit 7
red digital input data; bit 8
red digital input data; bit 9 (MSB)
Table 3.
Symbol
B3
B4
B5
B6
B7
B8
B9
CLK
V
SSA1
V
SSA2
OUTB
OUTB
V
DDA2
V
DDA3
OUTG
OUTG
OUTR
OUTR
COMP
VREF
RSET
PSAVE
R0
R1
R2
R3
R4
R5
R6
R7
R8
R9
8. Functional description
This triple 10-bit video DAC is designed to convert digital input signals into analog output
currents. All inputs (clock, data, blank and sync) must be TLL levels.
8.1 Voltage reference
The voltage reference input to pin VREF should be 1.21 V. For correct operation, a 100 nF
capacitor should be connected between pin VREF and pin V
DDA
.
TDA8777_4
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 04 — 11 April 2006
5 of 18
PCB设计
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