ISL59451 Datasheet, PDF (12/17 Pages) Intersil Corporation – Triple 4:1 DC Restored Single Supply Video Multiplexing Amplifier

Functional Block Diagram
S0
S1
CX1 _R0/G0/B0
CX1 _R1/G1/B1
CX1 _R2/G2/B2
CX1 _R3/G3/B3
1.6V
+
V1
S1
ISL59451
AV2
A1
4kΩ
ROUT
GOUT
BOUT
TABLE 1. CHANNEL SELECT LOGIC TABLE
S1
S0
HIZ
OUTPUT
0
0
0
R0, G0, B0
0
1
0
R1, G1, B1
1
0
0
R2, G2, B2
1
1
0
R3, G3, B3
X
X
1
High Impedance,
Inputs Disconnected
A2
+-
40pF
REF_G
CLAMP
OR REF_RB
GND
Pin Descriptions
ISL59451
(32 LD QFN)
1
2
3
4, 6, 10, 17, 22, 27, 32
5, 20, 28
7
8
9
11
12
13
14
15
16
18
19
21
23
24
25
EQUIVALENT
PIN NAME CIRCUIT
DESCRIPTION
R1
Circuit 1 Channel 1 Red/Pr/Chroma Input
B1
Circuit 1 Channel 1 Blue/Pb/Chroma Input
G1
Circuit 1 Channel 1 Green/Luma Input
GND
Circuit 4 Ground
V+
Circuit 4 Positive Supply. Bypass to GND with 0.01µF and 1nF capacitors.
R2
Circuit 1 Channel 2 Red/Pr/Chroma Input
B2
Circuit 1 Channel 2 Blue/Pb/Chroma Input
G2
Circuit 1 Channel 2 Green/Luma Input
R3
Circuit 1 Channel 3 Red/Pr/Chroma Input
B3
Circuit 1 Channel 3 Blue/Pb/Chroma Input
G3
Circuit 1 Channel 3 Green/Luma Input
S1
Circuit 2 Channel selection pin MSB (binary logic code). This pin does not have internal pull-up or
pull-down resistors.
S0
Circuit 2 Channel selection pin. LSB (binary logic code). This pin does not have internal pull-up or
pull-down resistors.
CLAMP
Circuit 2
Clamp/Store Logic Input. Logic ‘0’ selects the clamp DC restore state, logic ‘1’ selects the
hold state. This pin does not have internal pull-up or pull-down resistors.
GOUT
Circuit 3 Green/Luma Output
REF_G
Green/Luma Reference. Green/Luma channel offset by this voltage during DC restore
state. Reference voltage range is 0 to +3.0V.
BOUT
Circuit 3 Blue Output
REF_RB
Red and Blue Reference. Red and blue channels offset by this voltage during DC restore
state. Reference voltage range is 0 to +3.0V.
ROUT
Circuit 3 Red Output
AV2
Circuit 2 Gain Set. Set to logic high for gain of x2 (+6dB), or set to logic low for a gain of x1 (+0dB). If
left floating, an internal pull-down resistor pulls this pin low (300kΩ pull-down).
12
FN6253.0
September 24, 2007