Philips TDA8771H-C2-R1, TDA8775G-C1 Datasheet

INTEGRATED CIRCUITS

TDA8775

Triple 10-bit video Digital-to-Analog Converter (DAC)

Preliminary specification			1996 Aug 14
File under Integrated Circuits, IC02

Philips Semiconductors	Preliminary specification

Triple 10-bit video Digital-to-Analog

TDA8775

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.

QUICK REFERENCE DATA

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.

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		SLT = 1; RL = 37.5 Ω	−	67	tbf	mA
			SLT = 0; RL = 150 Ω	−	16	tbf	mA
IDDD	digital supply current		SLT = 1; RL = 37.5 Ω	−	15	tbf	mA
			SLT = 0; RL = 150 Ω	−	10	tbf	mA
INL	DC integral non-linearity			−	±1	±2	LSB
DNL	DC differential non-linearity			−	±0.7	±1.0	LSB
fclk(max)	maximum clock frequency		SLT = 1; RL = 37.5 Ω	50	−	−	MHz
			SLT = 0; RL = 150 Ω	35	−	−	MHz
Ptot	total power dissipation		SLT = 1; RL = 37.5 Ω;	−	410	tbf	mW
			fclk = 50 MHz
			SLT = 0; RL = 150 Ω;	−	130	tbf	mW
			fclk = 35 MHz
ORDERING INFORMATION
TYPE			PACKAGE
NUMBER	NAME		DESCRIPTION			VERSION
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

TDA8775

Converter (DAC)

BLOCK DIAGRAM

handbook, full pagewidth		VDDA1	VDDA2	VDDA3		VDDD1		VDDD2
red		38	41	45		11			37
	10-7
digital inputs						4
(bits R0 to R3)
		TDA8775				LSB			25	CLK
						DECODER
red	6-1		6	MSB		CURRENT			46
digital inputs										OUTR
			DECODER			SOURCE
(bits R4 to R9)
green	24-21
digital inputs						4
(bits G0 to G3)
						LSB
						DECODER
green	20-15		6	MSB		CURRENT
digital inputs									44
			DECODER			SOURCE				OUTG
(bits G4 to G9)
blue	35-32								47	VSSA3
digital inputs						4
(bits B0 to B3)
									43
										VSSA2
						LSB
						DECODER			40	VSSA1
blue	31-26		6	MSB		CURRENT			42
digital inputs										OUTB
			DECODER			SOURCE
(bits B4 to B9)
BLANK	14
control input		CONTROL				CURRENT
	13
SYNC		REGISTER				REFERENCE
control input				48		39		12	36
										MGE965
				SLT	reference current		VSSD1		VSSD2
					decoupling input
						(Iref)

Fig.1 Block diagram.

1996 Aug 14

3

Philips Semiconductors	Preliminary specification

Triple 10-bit video Digital-to-Analog

TDA8775

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)
	VDDD1				11	digital supply voltage 1
		VSSD1			12	digital supply ground 1
					13	composite sync control input; for green channel only (active LOW)
		SYNC
					14	composite blank control input (active LOW)
	BLANK
	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)
	VSSD2				36	digital supply ground 2
	VDDD2				37	digital supply voltage 2
	VDDA1				38	analog supply voltage 1
	Iref				39	decoupling pin for reference current
	VSSA1				40	analog supply ground 1

1996 Aug 14

4

Philips Semiconductors	Preliminary specification

Triple 10-bit video Digital-to-Analog

TDA8775

Converter (DAC)

SYMBOL	PIN	DESCRIPTION
VDDA2	41	analog supply voltage 2
OUTB	42	blue analog output
VSSA2	43	analog supply ground 2
OUTG	44	green analog output
VDDA3	45	analog supply voltage 3
OUTR	46	red analog output
VSSA3	47	analog supply ground 3
SLT	48	mode selection; normal mode, RL = 37.5 Ω (active HIGH); low power mode,
		RL = 150 Ω (active LOW)

SLT	SSA3	OUTR	DDA3	OUTG	SSA2	OUTB	DDA2	SSA1	ref	DDA1	DDD2
	V		V		V		V	V	I	V	V
48	47	46	45	44	43	42	41	40	39	38	37

R9 1

R8 2

R7 3

R6 4

R5 5

R4 6

TDA8775

R3 7

R2 8

R1 9

R0 10

VDDD1 11

VSSD1 12

	13			14		15		16		17		18		19		20		21		22		23		24
		SYNC		BLANK		G9		G8		G7		G6		G5		G4		G3		G2		G1		G0

36 VSSD2

35 B0

34 B1

33 B2

32 B3

31 B4

30 B5

29 B6

28 B7

27 B8

26 B9

25 CLK

MGE964

Fig.2 Pin configuration.

1996 Aug 14

5