Philips tda8707 DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

TDA8707

Triple RGB 6-bit video
analog-to-digital interface

Product specification
Supersedes dat of March 1995
File under Integrated Circuits, IC02

1996 Feb 01

Philips Semiconductors Product specification

Triple RGB 6-bit video analog-to-digital
interface

FEATURES

• Triple analog-to-digital converter (ADC)

• 6-bit resolution

• Sampling rate up to 35 MHz

• Power dissipation of 335 mW (typical)

• Internal clamping function

• TTL compatible digital inputs

•−40 to +85 °C operating temperature

• CMOS digital outputs.

APPLICATIONS

• High-speed analog-to-digital conversion for video
signals

• VGA signal treatment.

DESCRIPTION

The TDA8707 is a CMOS triple 6-bit video low-power
analog-to-digital converter (ADC) for RGB signals.

TDA8707

It converts the analog inputs into 6-bit binary coded digital
words at a sampling rate of 35 MHz. All analog signal
inputs are clamped.

Analog-to-digital converter

The TDA8707 implements 3 independent 6-bit
analog-to-digital converters in CMOS process. These
converters use a full-flash approach.

Clamping feature

An internal clamping circuit is provided in each of the
3 analog channels. The analog pins INR, ING and INB are
switched, through series capacitors, to on-chip clamping
levels during an active pulse on the clamp input CLP.
Clamping level in the R, G and B channels is Code 0.

Input buffers

Internal buffers are provided to drive the analog-to-digital
converter inputs. Their ratio can be adjusted externally at

1.5 or 2.0 with select input SLT.

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

DDA

V

DDD

I

DDA

I

DDD

INL integral non-linearity f

DNL differential non-linearity f

analog supply voltage 4.5 5.0 5.5 V
digital supply voltage 4.5 5.0 5.5 V
analog supply current − 60 80 mA
digital supply current f

= 35 MHz − 58mA

clk

= 35 MHz; ramp input;

clk

T

=25°C

amb

= 35 MHz; ramp input;

clk

=25°C

T

amb

−±0.35 ±0.6 LSB

−±0.35 ±0.6 LSB

EB effective bits note 1 − 5.3 − bits
f

clk

P

tot

maximum clock conversion rate 35 −−MHz
total power dissipation f

= 35 MHz; note 2 − 335 485 mW

clk

Notes

1. The number of effective bits is measured with a clock frequency of 35 MHz. This value is given for a 4.43 MHz

frequency on the R, G and B channels.

2. The external resistor (value 15 kΩ) between V

and CLREF, fixing internal static currents, influences P

DDA

.

tot

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

TDA8707H QFP44 plastic quad flat package; 44 leads; lead length 1.3 mm; body 10× 10 × 1.75 mm SOT307-2

1996 Feb 01 2

Philips Semiconductors Product specification

Triple RGB 6-bit video analog-to-digital
interface

BLOCK DIAGRAM

handbook, full pagewidth

V
V

V
V

DDA1
SSA1

INR

DDA2
SSA2

ING

33
35

34

30
32

31

BUFFER

BUFFER

CLREF CLP CLK

24 23 10

CLAMPING

CIRCUIT

CLAMPING

CIRCUIT

6-BIT

ADC

6-BIT

ADC

38,

40-44

6

3-8

6

TDA8707

R0 to R5

G0 to G5

V

DDA3

V

SSA3

INB

CREFH
CREFL

27
29

28

26
25

BUFFER

36

SLT

TDA8707

CLAMPING

CIRCUIT

Fig.1 Block diagram.

6-BIT

ADC

V

DDD1VSSD1

14-16,

18-20

6

22
21

911

MGA919

B0 to B5

V

DDD2

V

SSD2

1996 Feb 01 3

Philips Semiconductors Product specification

Triple RGB 6-bit video analog-to-digital
interface

PINNING

SYMBOL PIN DESCRIPTION

n.c. 1 not connected
n.c. 2 not connected
G0 3 GREEN data output; bit 0 (LSB)
G1 4 GREEN data output; bit 1
G2 5 GREEN data output; bit 2
G3 6 GREEN data output; bit 3
G4 7 GREEN data output; bit 4
G5 8 GREEN data output; bit 5 (MSB)
V

SSD1

CLK 10 clock input
V

DDD1

n.c. 12 not connected
n.c. 13 not connected
B0 14 BLUE data output; bit 0 (LSB)
B1 15 BLUE data output; bit 1
B2 16 BLUE data output; bit 2
n.c. 17 not connected
B3 18 BLUE data output; bit 3
B4 19 BLUE data output; bit 4
B5 20 BLUE data output; bit 5 (MSB)
V

SSD2

V

DDD2

9 digital supply ground 1

11 digital supply voltage 1

21 digital supply ground 2
22 digital supply voltage 2

TDA8707

SYMBOL PIN DESCRIPTION

CLP 23 clamping input
CLREF 24 ADCs current reference level input
CREFL 25 converter reference LOW level input
CREFH 26 converter reference HIGH level input
V

DDA3

INB 28 BLUE analog input
V

SSA3

V

DDA2

ING 31 GREEN analog input
V

SSA2

V

DDA1

INR 34 RED analog input
V

SSA1

SLT 36 select input buffer ratio
n.c. 37 not connected
R0 38 RED data output; bit 0 (LSB)
n.c. 39 not connected
R1 40 RED data output; bit 1
R2 41 RED data output; bit 2
R3 42 RED data output; bit 3
R4 43 RED data output; bit 4
R5 44 RED data output; bit 5 (MSB)

27 analog supply voltage 3

29 analog supply ground 3
30 analog supply voltage 2

32 analog supply ground 2
33 analog supply voltage 1

35 analog supply ground 1

1996 Feb 01 4

Philips Semiconductors Product specification

Triple RGB 6-bit video analog-to-digital
interface

R5R4R3R2R1

V

SSD1

V

DDD1

index
corner

n.c.
n.c.

G0
G1
G2

G3
G4

G5

CLK

1
2
3
4
5
6
7
8

9
10
11

44

43

42

41

40

TDA8707

n.c.

39

R0

38

n.c.

37

SLT
36

SSA1

V
35

INR
34

33
32
31
30
29
28
27
26
25
24
23

V

DDA1

V

SSA2
ING
V

DDA2

V

SSA3
INB
V

DDA3

CREFH
CREFL

CLREF
CLP

TDA8707

20

21

B5

SSD2

V

22

DDD2

V

MGA920

12

n.c.

13

n.c.

14
B0

15
B1

16
B2

17

n.c.

B3

18

19
B4

Fig.2 Pin configuration.

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V
V
∆V
V
V

DDA
DDD

DD
I
i(p-p)

analog supply voltage (pins 27, 30 and 33) −0.3 +6.5 V
digital supply voltage (pins 11 and 22) −0.3 +6.5 V
supply voltage difference between V
input voltage (pins 28, 31 and 34) referenced to V
AC input voltage for switching

DDA

and V

DDD

referenced to V

−0.5 +0.5 V

− V

SSA

− V

SSD

DDA
DDD

V
V

(pins 10 and 23; peak-to-peak value)

T

stg

T

amb

T

j

storage temperature −55 +150 °C
operating ambient temperature −40 +85 °C
junction temperature − +125 °C

THERMAL CHARACTERISTICS

SYMBOL PARAMETER VALUE UNIT

R

th j-a

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

1996 Feb 01 5