Philips TDA8771AH-C1-R2, TDA8771AH-C1-R1, TDA8771AH-C1 Datasheet

INTEGRATED CIRCUITS

DATA SHEET

TDA8771A

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

Product specification			1996 Jan 25
File under Integrated Circuits, IC02

Philips Semiconductors	Product specification

Triple 8-bit video Digital-to-Analog

TDA8771A

Converter (DAC)

FEATURES

∙8-bit resolution

∙Sampling rate up to 35 MHz

∙Internal reference voltage regulator

∙No deglitching circuit required

∙Large output voltage range

∙1 kΩ 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.

QUICK REFERENCE DATA

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.

SYMBOL	PARAMETER		CONDITIONS	MIN.	TYP.	MAX.	UNIT
VDDA	analog supply voltage			4.5	5.0	5.5	V
VDDD	digital supply voltage			4.5	5.0	5.5	V
IDDA	analog supply current	RL = 1 kΩ; note 1		10	33	45	mA
IDDD	digital supply current	fclk = 35	MHz	−	7	20	mA
INL	integral non-linearity	fclk = 35	MHz; ramp input	−	±0.5	±1	LSB
DNL	differential non-linearity	fclk = 35	MHz; ramp input	−	±0.25	±0.5	LSB
fclk(max)	maximum clock frequency			35	−	−	MHz
Ptot	total power dissipation	RL = 1 kΩ; fclk = 35 MHz; note 1		45	200	360	mW

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		PACKAGE
NUMBER	NAME	DESCRIPTION	VERSION
TDA8771AH	QFP44	plastic quad flat package; 44 leads (lead length 1.3 mm);	SOT307-2
		body 10 × 10 × 1.75 mm

1996 Jan 25

2

Philips Semiconductors	Product specification

Triple 8-bit video Digital-to-Analog

TDA8771A

Converter (DAC)

BLOCK DIAGRAM

			V DDA		VDDD	clock input
RED	4			32,35,39,43	7,27	31
		12 to 9					1	reference
digital inputs
					4			current input
(bits R0 to R3)
								(IREF )
		TDA8771A			LSB
					DECODER
RED	4	8		MSB	RESISTOR		44	RED
digital inputs			4
		5 to 3		DECODER	STRING			analog output
(bits R4 to R7)
GREEN	4	20 to 17
digital inputs					4
(bits G0 to G3)
					LSB
					DECODER
GREEN	4	16 to 13		MSB	RESISTOR		40	GREEN
digital inputs			4
				DECODER	STRING			analog output
(bits G4 to G7)
BLUE	4	30,29
digital inputs		26,25			4
(bits B0 to B3)
					LSB
					DECODER
BLUE	4	24 to 21		MSB	RESISTOR		36	BLUE
digital inputs			4
				DECODER	STRING			analog output
(bits B4 to B7)
					BANDGAP
					REFERENCE
		34, 37,	38,41		33	2,42	6,28	MBH039

	not	reference voltage	VSSA	V SSD
	connected	decoupling input
		(VREF )

Fig.1 Block diagram.

1996 Jan 25

3

Philips Semiconductors	Product specification

Triple 8-bit video Digital-to-Analog

TDA8771A

Converter (DAC)

PINNING

SYMBOL	PIN	DESCRIPTION
IREF	1	reference current input for output buffers
VSSA1	2	analog supply ground 1
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
VSSD1	6	digital supply ground 1
VDDD1	7	digital supply voltage 1
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
VDDD2	27	digital supply voltage 2
VSSD2	28	digital supply ground 2
B1	29	BLUE digital input data; bit 1
B0	30	BLUE digital input data; bit 0 (LSB)
CLK	31	clock input
VDDA1	32	analog supply voltage 1
VREF	33	decoupling input for reference voltage
n.c.	34	not connected
VDDA2	35	analog supply voltage 2
OUTB	36	BLUE analog output
n.c.	37	not connected
n.c.	38	not connected
VDDA3	39	analog supply voltage 3
OUTG	40	GREEN analog output

1996 Jan 25

4

Philips Semiconductors	Product specification

Triple 8-bit video Digital-to-Analog

TDA8771A

Converter (DAC)

SYMBOL	PIN	DESCRIPTION
n.c.	41	not connected
VSSA2	42	analog supply ground 2
VDDA4	43	analog supply voltage 4
OUTR	44	RED analog output

index corner

I REF 1

V SSA1 2 R7 3 R6 4

R5 5

VSSD1 6

VDDD1 7 R4 8

R3 9

R2 10

R1 11

OUTR		DDA4		SSA2		n.c.		OUTG		DDA3		n.c.		n.c.		OUTB		DDA2		n.c.
		V		V						V								V
44		43		42		41		40		39		38		37		36		35		34

TDA8771A

12		13		14		15		16		17		18		19		20		21		22
R0		G7		G6		G5		G4		G3		G2		G1		G0		B7		B6

33	V REF
	VDDA1
32
31	CLK
30	B0
29	B1
	VSSD2
28
	VDDD2
27
26	B2
	B3
25
24	B4
23	B5

MBH040

Fig.2 Pin configuration.

1996 Jan 25

5

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
VDDA	analog supply voltage	−0.5		+6.5		V
VDDD	digital supply voltage	−0.5		+6.5		V
VDD	supply voltage difference between VDDA and VDDD	−1.0		+1.0		V
Tstg	storage temperature	−55		+150		°C
Tamb	operating ambient temperature	0		+70		°C
Tj	junction temperature	−		+125		°C
THERMAL CHARACTERISTICS
SYMBOL	PARAMETER	VALUE				UNIT
Rth j-a	thermal resistance from junction to ambient in free air	75				K/W

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.

1996 Jan 25

6