Philips tda8771a DATASHEETS

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TDA8771A

Triple 8-bit video Digital-to-Analog Converter (DAC)

Product speciﬁcation File under Integrated Circuits, IC02

1996 Jan 25

Philips Semiconductors Product speciﬁcation

Triple 8-bit video Digital-to-Analog Converter (DAC)

FEATURES

• 8-bit resolution

• Sampling rate up to 35 MHz

• Internal reference voltage regulator

• No deglitching circuit required

• Large output voltage range

• 1kΩ output load

• Power dissipation only 200 mW

• Single 5 V power supply

• 44-pin QFP package.

APPLICATIONS

• General purpose high-speed digital-to-analog conversion

• Digital TV

• Graphic display

• Desktop video processing.

TDA8771A

GENERAL DESCRIPTION

The TDA8771A is a triple 8-bit video Digital-to-Analog Converter (DAC). It converts the digital input signals into analog voltage outputs at a maximum conversion rate of 35 MHz.

The DACs are based on resistor-string architecture with integrated output buffers. The output voltage range is determined by a built-in reference source.

The device is 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

DDA

DDD

DDA

DDD

INL integral non-linearity f DNL differential non-linearity f f

clk(max)

tot

analog supply voltage 4.5 5.0 5.5 V digital supply voltage 4.5 5.0 5.5 V analog supply current RL=1kΩ; note 1 10 33 45 mA digital supply current f

= 35 MHz − 720mA

clk

= 35 MHz; ramp input −±0.5 ±1 LSB

clk

= 35 MHz; ramp input −±0.25 ±0.5 LSB

clk

maximum clock frequency 35 −−MHz total power dissipation RL=1kΩ; f

= 35 MHz; note 1 45 200 360 mW

clk

Note

1. Minimum and maximum data of current and power consumption are measured in worse case conditions: for

minimum data, all digital inputs are at logic level 0 while for maximum data, all digital inputs are at logic level 1.

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

TDA8771AH QFP44 plastic quad ﬂat package; 44 leads (lead length 1.3 mm);

P ACKAGE

SOT307-2

body 10 × 10 × 1.75 mm

1996 Jan 25 2

Philips Semiconductors Product speciﬁcation

Triple 8-bit video Digital-to-Analog Converter (DAC)

BLOCK DIAGRAM

handbook, full pagewidth

(bits R0 to R3)

(bits R4 to R7)

(bits G0 to G3)

RED

digital inputs

RED

digital inputs

GREEN

digital inputs

12 to 9

8 5 to 3

20 to 17

TDA8771A

DDA DDD

DECODER

MSB

7,2732,35,39,43

LSB

DECODER

RESISTOR

STRING

TDA8771A

clock input

reference

current input

(I )

REF

RED

analog output

GREEN

digital inputs

(bits G4 to G7)

BLUE

digital inputs

(bits B0 to B3)

BLUE

digital inputs

(bits B4 to B7)

16 to 13

30,29 26,25

24 to 21

34, 37, 38,41 33

MSB

DECODER

MSB

DECODER

LSB

DECODER

RESISTOR

STRING

LSB

DECODER

RESISTOR

STRING

BANDGAP

REFERENCE

2,42 6,28

GREEN

analog output

BLUE

analog output

MBH039

not

connected

reference voltage

decoupling input

Fig.1 Block diagram.

1996 Jan 25 3

(V )

REF

SSA SSD

Philips Semiconductors Product speciﬁcation

Triple 8-bit video Digital-to-Analog Converter (DAC)

PINNING

SYMBOL PIN DESCRIPTION

REF

SSA1

R7 3 RED digital input data; bit 7 (MSB) R6 4 RED digital input data; bit 6 R5 5 RED digital input data; bit 5 V

SSD1

DDD1

R4 8 RED digital input data; bit 4 R3 9 RED digital input data; bit 3 R2 10 RED digital input data; bit 2 R1 11 RED digital input data; bit 1 R0 12 RED digital input data; bit 0 (LSB) G7 13 GREEN digital input data; bit 7 (MSB) G6 14 GREEN digital input data; bit 6 G5 15 GREEN digital input data; bit 5 G4 16 GREEN digital input data; bit 4 G3 17 GREEN digital input data; bit 3 G2 18 GREEN digital input data; bit 2 G1 19 GREEN digital input data; bit 1 G0 20 GREEN digital input data; bit 0 (LSB) B7 21 BLUE digital input data; bit 7 (MSB) B6 22 BLUE digital input data; bit 6 B5 23 BLUE digital input data; bit 5 B4 24 BLUE digital input data; bit 4 B3 25 BLUE digital input data; bit 3 B2 26 BLUE digital input data; bit 2 V

DDD2

SSD2

B1 29 BLUE digital input data; bit 1 B0 30 BLUE digital input data; bit 0 (LSB) CLK 31 clock input V

DDA1

REF

n.c. 34 not connected V

DDA2

OUTB 36 BLUE analog output n.c. 37 not connected n.c. 38 not connected V

DDA3

OUTG 40 GREEN analog output

1 reference current input for output buffers 2 analog supply ground 1

6 digital supply ground 1 7 digital supply voltage 1

27 digital supply voltage 2 28 digital supply ground 2

32 analog supply voltage 1 33 decoupling input for reference voltage

35 analog supply voltage 2

39 analog supply voltage 3

TDA8771A

1996 Jan 25 4

Philips Semiconductors Product speciﬁcation

Triple 8-bit video Digital-to-Analog Converter (DAC)

SYMBOL PIN DESCRIPTION

n.c. 41 not connected V

SSA2

DDA4

OUTR 44 RED analog output

handbook, full pagewidth

42 analog supply ground 2 43 analog supply voltage 4

OUTR

SSA1

SSD1

DDD1

REF

R7 R6 R5

R4 R3 R2 R1

index corner

1 2 3 4 5 6 7 8

9 10 11

DDA4

V 43

SSA2

OUTG

n.c. 41

TDA8771A

DDA3

V 39

n.c.

OUTB 36

DDA2

n.c.

TDA8771A

REF

DDA1

CLK

B1 V

SSD2

DDD2

B2 B3

25 24

G4G3G2G1G0

Fig.2 Pin configuration.

1996 Jan 25 5

21 B7

22 B6

MBH040

Philips Semiconductors Product speciﬁcation

Triple 8-bit video Digital-to-Analog

TDA8771A

Converter (DAC)

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC134).

SYMBOL PARAMETER MIN. MAX. UNIT

DDA

DDD

∆V

stg

amb

THERMAL CHARACTERISTICS

SYMBOL PARAMETER VALUE UNIT

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 +6.5 V digital supply voltage −0.5 +6.5 V supply voltage difference between V

DDA

and V

DDD

−1.0 +1.0 V storage temperature −55 +150 °C operating ambient temperature 0 +70 °C junction temperature − +125 °C

thermal resistance from junction to ambient in free air 75 K/W

1996 Jan 25 6

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