2.3Analog-to-Digital Converter 2.3.1 Pin Connection

The RGB signals are to be connected to the gmZAN1 chip as described in Table 8 and Table 9.

Table 8. Pin Connection for RGB Input with Hsync/Vsync

GmZAN1 Pin Name (Pin Number)

CRT Signal Name

Red+(#95)

Red

Red- (#94)

N/A (Tie to Analog GND for Red on the board)

Green+(#91)

Green

Green- (#90)

N/A (Tie to Analog GND for Green on the board)

Blue+(#87)

Blue

Blue- (#86)

N/A (Tie to Analog GND for Blue on the board)

HSYNC/CS (#150)

Horizontal Sync

VSYNC (#148)

Vertical Sync

Table 9. Pin Connection for RGB Input with Composite Sync

GmZAN1 Pin Name (Pin Number)

CRT Signal Name

Red+(#95)

Red

Red- (#94)

N/A (Tie to Analog GND for Red on the board)

Green+(#91)

Green

 

When using Sync-On-Green this signal also carries the sync pulse.

Green- (#90)

N/A (Tie to Analog GND for Green on the board)

Blue+(#87)

Blue

Blue- (#86)

N/A (Tie to Analog GND for Blue on the board)

HSYNC/CS (#150)

Digital composite sync. Not applicable for Sync-On-Green

The gmZAN1 chip has three ADC’s (analog-to-digital converters), one for each color (red, green, and blue). Table 10 summarizes the characteristics of the ADC.

Table 10. ADC Characteristics

 

 

MIN

TYP

MAX

NOTE

RGB Track & Hold Amplifiers

 

 

 

 

Band Width

 

 

160MHz

 

Full Scale Input = 0.75V, BW=160MHz(*)

Settling Time to 1/2%

 

 

8.5ns

 

Full Scale Adjust Range @ R,G,B Inputs

0.45V

 

0.95V

Measured @ ADC Output (**)

Full Scale Adjust Sensitivity

 

 

+/-1 LSB

 

Zero Scale Adjust Range

 

 

 

 

For a larger DC offset from an external

 

 

 

 

 

video source, the AC coupling feature is

 

 

 

 

 

used to remove the offset.

Zero Scale Adjust Sensitivity

 

 

+/-1 LSB

 

Measured @ ADC Output

ADC+RGB Track & Hold Amplifiers

 

 

 

 

Sampling Frequency (fs)

 

20MHz

 

110MHz

fs = 80 MHz

DNL

 

 

 

+/- 0.9LSB

INL

 

 

+/- 1.5LSB

 

fs = 80 MHz

Channel to Channel Matching

 

 

+/- 0.5LSB

 

fin = 1MHz, fs=80 MHz Vin= -1db below

Effective Number of Bits (ENOB)

 

7 Bits

 

 

 

 

 

 

full scale=0.75V

Power Dissipation

 

 

400mW

 

fs=110 MHz, Vdd=3.3V

Shut Down Current

 

 

 

100uA

 

(*) Guaranteed by design

(**) Independent of full scale R,G,B input

 

The gmZAN1 ADC has a built-in clamp circuit. By inserting series capacitors (about 10 nF) the DC offset of an external video source can be removed. The clamp pulse position and width are programmable.

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AOC P/N : 41A50-144 Analog-to-Digital Converter 2.3.1 Pin Connection, Pin Connection for RGB Input with Hsync/Vsync
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