SM5320A
5-channel Video Buffer with Built-in wideband LPF
OVERVIEW
The SM5320A is a 5-channel video buffer with built-in 5th-order lowpass filters. The HD block lowpass filter
cutoff frequency range can adjust from 4.10MHz to 42.7MHz
*1
by 256 steps. The lowpass filter supports 480i
to 1080i format, video signal equipment analog input/outputs. For video input systems, the device functions as
a next-stage ADC system anti-aliasing filter. For video output systems, the filter reduces video DAC aliasing
and external noise and can drive up to 300Ω terminating resistance. The cutoff frequency and signal input type
can be controlled using an I
2
C-BUS
*2
, and the I
2
C slave address can be set by ADS (3-state input) to allow up
to three SM5320A on the same bus. The output gain can be varied in the range of 0dB
±
2.1dB (max step:
0.15dB) for each Y/C block and HD block individually using the I
2
C-BUS.
*1. When the resistor connected to ISET (R
ISET
) is 1.8kΩ.
*2. I
2
C-BUS is a registered trademark of NXP B.V.
FEATURES
I
PINOUT
(Top view)
CIN
YIN
VCC4
VDD
SDA
SCL
GND6
VCC5
NC
ISET
GND1
IN3
IN2
IN1
I
I
I
I
I
I
I
I
I
I
I
Supply voltages
• Analog: 4.75 to 5.25V
• Digital: 3.0 to 5.5V
Lowpass filter with adjustable cutoff frequency
(256 steps) (CH-1 to CH-3)
• Cutoff frequency range: 4.10MHz to 42.7MHz
(R
ISET
=
1.8kΩ)
Filter bypass mode function for display specifica-
tions up to SXGA resolution (CH-1 to CH-3)
• Passband: 80MHz (typ)
Half fc mode switch function suitable for compo-
nent signals (CH-2, CH-3)
Video input pins can be independently set to sync-
tip clamp/bias inputs (CH-1 to CH-3)
Filter passband (± 1.5dB): 6MHz (CH-Y/C)
Up to 300Ω terminating resistance drive capability
Output gain: 0dB
±
2.1dB (max step: 0.15dB)
Power-down function
•
≤
500
µ
A current consumption when power-down
I
2
C-BUS interface control
• Slave address: 48h, 49h, or 4Ah
(up to three devices can be used simultaneously,
selected by ADS input)
• Data transfer rate: Fast mode (up to 400kbit/s)
Operating ambient temperature range: 0 to 70°C
Package: 28-pin VSOP
1
28
GND5
COUT
VCC3
YOUT
GND4
VCC2
OUT3
GND3
OUT2
VCC1
OUT1
GND2
REF
14
15
ADS
PACKAGE DIMENSIONS
(Unit: mm)
+
0.15
−
0.1
0.05
5.6 ± 0.2
I
I
I
0.675TYP
9.8 ± 0.2
0 to 10 °
0.10 ± 0.05
Device
SM5320AV
Package
28-pin VSOP
1.15 ± 0.1
ORDERING INFORMATION
0.65
+ 0.1
0.22 - 0.05
0.10
0.12 M
SEIKO NPC CORPORATION —1
0.5 ± 0.2
I
HDTVs
LCD TVs
PDPs
Projectors
7.6 ± 0.2
APPLICATIONS
SM5320A
PIN DESCRIPTION
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
*1. I: input, O: output
*2. A: analog, D: digital
Name
CIN
YIN
VCC4
VDD
SDA
SCL
GND6
VCC5
NC
ISET
GND1
IN3
IN2
IN1
ADS
REF
GND2
OUT1
VCC1
OUT2
GND3
OUT3
VCC2
GND4
YOUT
VCC3
COUT
GND5
I/O
*1
I
I
–
–
I/O
I
–
–
–
–
–
I
I
I
I
O
–
O
–
O
–
O
–
–
O
–
O
–
A/D
*2
A
A
A
D
D
D
A
A
–
A
A
A
A
A
D
A
A
A
A
A
A
A
A
A
A
A
A
A
Video signal input (C)
Video signal input (Y)
Analog supply 4
Digital supply
I
2
C data signal input/output
I
2
C clock signal input
Ground 6
Analog supply 5
No connection
Internal current-setting resistor (R
ISET
) connection (standard 1.8kΩ)
Ground 1
Video signal input (CH-3)
Video signal input (CH-2)
Video signal input (CH-1)
I
2
C slave address select (3-state input)
Internal reference voltage
Ground (Y/C block)
Video signal output (CH-1)
Analog supply 1
Video signal output (CH-2)
Ground 3
Video signal output (CH-3)
Analog supply 2
Ground 4
Video signal output (Y)
Analog supply 3
Video signal output (C)
Ground 5
Description
SEIKO NPC CORPORATION —3
嵌入式系统
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