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Fabricante

SAA7185

Digital Video Encoder (DENC2)

Philips Electronics 

Philips Semiconductors

Digital Video Encoder (DENC2)

Preliminary specification

SAA7185

SYMBOL

LLC

Cref

XTALO

XTALI

VSSD6

RTCI

AP

SP

VrefL

VrefH

VDDA1

CHROMA

VDDA2

Y

VSSA

CVBS

VDDA3

II

VDDA4

RESET

DTACK

RW/SCL

A0/SDA

CS/SA

VSSD7

DP0

DP1

DP2

DP3

VDDD3

SEL_MPU

PIN

DESCRIPTION

38 Line-Locked Clock. This is the 27 MHz master clock for the encoder. The direction is set by

the CDIR pin.

39 Clock Reference signal. This is the clock qualifier for DIG-TV2 compatible signals.

40 Crystal oscillator output (to crystal).

41 Crystal oscillator input (from crystal). If the oscillator is not used, this pin should br connected

to ground.

42 digital ground 6

43 Real Time Control Input. If the clock is provided by an SAA7151B, RTCI should be connected

to the RTCO pin of the decoder to improve the signal quality.

44 Test pin. Connect to digital ground for normal operation.

45 Test pin. Connect to digital ground for normal operation.

46 Lower reference voltage input for the DACs.

47 Upper reference voltage input for the DACs.

48 Analog positive supply voltage 1 for the DACs and output amplifiers.

49 Analog output of the chrominance signal.

50 Analog supply voltage 2 for the DACs and output amplifiers.

51 Analog output of the luminance signal.

52 Analog ground for the DACs and output amplifiers.

53 Analog output of the CVBS signal.

54 Analog supply voltage 3 for the DACs and output amplifiers.

55 Current input for the output amplifiers, connect via a 15 kΩ resistor to VDDA.

56 Analog supply voltage 4 for the DACs and output amplifiers.

57 Reset input, active LOW. After reset is applied, all outputs are in 3-state input mode.

The I2C-bus receiver waits for the start condition.

58 Data acknowledge output of the parallel MPU interface, active LOW, otherwise high

impedance.

59 If pin 68 (SEL_MPU) is HIGH, this is the read/write signal of the parallel MPU interface,

otherwise it is the I2C-bus serial clock input.

60 If pin 68 (SEL_MPU) is HIGH, this is the address signal of the parallel MPU interface,

otherwise it is the I2C-bus serial data input/output.

61 If pin 68 (SEL_MPU) is HIGH, this is the chip select signal of the parallel MPU interface,

otherwise it is the I2C-bus slave address select pin. LOW: slave address = 88H, HIGH = 8CH.

62 digital ground 7

63

64 Lower 4 bits of the Data Port. If pin 68 (SEL_MPU) is HIGH, this is the data bus of the parallel

65 MPU interface. If it is LOW, they are the UV lines of the Video Port.

66

67 digital supply voltage 3

68 Select MPU interface input. If it is HIGH, the parallel MPU interface is active, otherwise the

I2C-bus interface will be used.

1996 Jul 08

5

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