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PDF SM5309B Data sheet ( Hoja de datos )
| Número de pieza | SM5309B | |
| Descripción | 3-channel Video Buffer | |
| Fabricantes | NPC | |
| Logotipo |  |
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SM5309B
3-channel Video Buffer with Built-in wideband LPF
OVERVIEW
The SM5309B is a 3-channel video buffer with built-in 5th-order lowpass filters. The lowpass filter cutoff fre-
quency range can adjust from 4MHz to 40MHz*1 by 256 steps. The lowpass filter supports 480i to 1080i for-
mat, 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 two 75Ω terminating resistance. The cutoff frequency and signal input type can be
controlled using an I2C-BUS*2, and the I2C slave address can be set by ADS (3-state input) to allow up to three
SM5309B on the same bus.
*1. When the resistor connected to ISET (RISET) is 1.8kΩ.
*2. I2C-BUS is a registered trademark of NXP B.V.
FEATURES
I Supply voltages
• Analog: 4.75 to 5.25V
• I2C-BUS interface: 3.0 to 5.5V
I Lowpass filter with adjustable cutoff frequency
(256 steps)
• Cutoff frequency range: 4MHz to 40MHz
(RISET = 1.8kΩ)
I Filter bypass mode function for display specifica-
tions up to SXGA resolution
• Passband: 80MHz (typ)
I Half fc mode switch function (CH-2, CH-3) suit-
able for component signals
I 2-system input multiplexer function
(switchable using I2C-BUS or MUXSEL input)
I Video input pins can be independently set to sync-
tip clamp/bias/direct inputs
I Up to two 75Ω terminating resistance drive capa-
bility
I Output gain: 0dB
I Power-down function
• ≤ 1mA current consumption when power-down
I I2C-BUS interface control
• Slave address: 90h, 92h, or 94h
(up to three devices can be used simultaneously,
selected by ADS input)
• Data transfer rate: Fast mode (up to 400kbit/s)
I Operating ambient temperature range: 0 to 70°C
I Package: 24-pin VSOP
PINOUT
(Top view)
IN1A
IN1B
GND
ISET
NC
IN2A
IN2B
VCC
IN3A
IN3B
MUXSEL
SCL
1
12
24 ADS
REF1
REF2
VCC
OUT1
GND
OUT2
VCC
OUT3
GND
VDD
13 SDA
PACKAGE DIMENSIONS
(Unit: mm)
7.9 ± 0.2
0.15
+
−
0.1
0.05
APPLICATIONS
I HDTVs
I LCD TVs
I PDPs
I Projectors
0 to 10
ORDERING INFORMATION
Device
SM5309BV
Package
24-pin VSOP
0.65
0.10
+ 0.1
0.22 − 0.05
0.12 M
SEIKO NPC CORPORATION —1
1 page  
Number
Name
I/O*1
13 SDA I/O
SM5309B
Equivalent circuit
VDD
SDA
250Ω
12 SCL
I
GND
SCL
180Ω
VDD
11 MUXSEL
I
GND
VCC
MUXSEL
180Ω
GND
VCC
24 ADS
I
ADS
250Ω
*1. I: input, O: output
Note. Resistance values in the equivalent circuits indicate design values.
GND
SEIKO NPC CORPORATION —5
5 Page 
SM5309B
FUNCTIONAL DESCRIPTION
I2C-BUS Control
The SM5309B uses an I2C BUS interface to set the following functions.
1) Cutoff frequency
2) Input multiplexer selection
3) fc mode switching (1/2 cutoff frequency switching)
4) Filter mode/filter bypass mode switching
5) Input type switching (sync-tip clamp, bias, direct)
6) Power-down function
The transfer rate of I2C-BUS corresponds to the fast-mode (up to 400kbit/s). Note that the SM5309B does not
support a read function (IC is write only).
Basic cycle
SDA
SCL
Start condition
Stop condition
I2C-BUS start/stop condition
The basic access cycle comprises the following elements.
1) Start condition
2) 1st byte: Slave address
3) 2nd byte: Subaddress
4) 3rd byte: Control data
5) Stop condition
If the input data does not match the slave address or the subaddress is incorrect, the corresponding ACK
(acknowledge) bit is not output LOW. However, the ACK bit is output after 3rd byte irrespective of the byte
data. Also note that the IC does not support a subaddress auto-increment function, hence each subaddress
access requires all the basic cycle steps 1 to 5.
Start
1st byte:Slave address
SDA
SCL
D7 D6
12
D1 D0 ACK
Low
78 9
2nd byte:Subaddress
D7 D6
D1 D0 ACK
12
789
3rd byte:Control data
Stop
D7 D6
D1 D0 ACK
12
78 9
SEIKO NPC CORPORATION —11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet SM5309B.PDF ] | |
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