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SM5301AS
3-channel Video Buffer with Built-in Wideband Filters
OVERVIEW
The SM5301AS is a video buffer with built-in video signal bandwidth lowpass filter. The filter employs a 5order Butterworth lowpass filter configuration. The filter characteristics have been optimized for minimal overshoot and flat group delay, it has a variable cutoff frequency and guaranteed driver-stage channel gain difference and phase difference values.
FEATURES
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PINOUT
(Top view)
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Supply voltage: 5V 10% VESA-standard ATSC digital TV RGB/YUV video filters 2-system input/1-system output switching analog multiplexer function DC voltage level restore sync clamp function Output buffer gain switching function: 0, 6dB (input-to-output AC signal gain) Channel-to-channel gain difference: 0.5dB ( 5% supply voltage variation) Channel-to-channel phase difference: 3.5 degree Output signal harmonic distortion (all channels): 1.5% Cutoff frequency: 5.8 to 37MHz variable Package: 28-pin HSOP (Pb free)
GINA/UINA GSG1 GINB/UINB NC BINA/VINA GSB1 BINB/VINB GND NC DISABLE GND3 BOUT/VOUT VCC3 GND2 GOUT/UOUT
1 2 3 4 5 6 7
28 27 26 25 24 23 22
NC RINB/YINB GSR1 RINA/YINA VCC4 SYNCIN MUXSEL GND VFC RFC GND4 VCC1 ROUT/YOUT GND1 VCC2
8 9 10 11 12 13 14
21 20 19 18 17 16 15
APPLICATIONS
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Set-top boxes Digital television DVD players Projector
ORDERING INFORMATION
Device SM5301AS Package 28-pin HSOP
PACKAGE DIMENSIONS
(Unit: mm)
+ 0.1 0.15 - 0.0 5
7.5 0.2
9.9 0.3
18.6 0.3
2.2 0.1
1.3TYP
0 to 10
0.8
5.15
0.10 0.35 0.05 0.12 M
NIPPON PRECISION CIRCUITS INC.--1
0.1 0.05
0.5 0.2
SM5301AS
BLOCK DIAGRAM
VCC1
VCC2
VCC3
VCC4
DISABLE RINA/YINA MUX RINB/YINB DC Restore LPF Buffer ROUT/YOUT GSR1
GINA/UINA MUX GINB/UINB DC Restore LPF
Buffer GOUT/UOUT GSG1
BINA/VINA MUX BINB/VINB MUXSEL SYNCIN DC Restore LPF
Buffer BOUT/VOUT GSB1
IFC Control
RFC
GND1
GND2
GND3
GND4
VFC
NIPPON PRECISION CIRCUITS INC.--2
SM5301AS
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 Name GINA/UINA GSG1 GINB/UINB NC BINA/VINA GSB1 BINB/VINB NC DISABLE GND3 BOUT/VOUT VCC3 GND2 GOUT/UOUT VCC2 GND1 ROUT/YOUT VCC1 GND4 RFC VFC MUXSEL SYNCIN VCC4 RINA/YINA GSR1 RINB/YINB NC I/O I I I - I I I - I - O - - O - - O - - - I I I - I I I - Description Analog GINA or UINA signal input. Sync signal is input on SYNCIN pin. GOUT/UOUT output buffer gain set input Analog GINB or UINB signal input. Sync signal is input on SYNCIN pin. No connection (leave open or connect to ground) Analog BINA or VINA signal input. Sync signal is input on SYNCIN pin. BOUT/VOUT output buffer gain set input Analog BINB or VINB signal input. Sync signal is input on SYNCIN pin. No connection (leave open or connect to ground) Power save function. Built-in pull-down resistor. L: Enable H: Disable (Output pins: ROUT/YOUT, GOUT/UOUT, and BOUT/VOUT are high impedance.) Analog ground B/V signal output Analog 5V supply Analog ground G/U signal output Analog 5V supply Analog ground R/Y signal output Analog 5V supply Analog ground LPF (lowpass filter) cutoff frequency setting resistor connection LPF (lowpass filter) cutoff frequency setting voltage input Input select signal. Built-in pull-down resistor. L: xINA pin select H: xINB pin select Filter channel external H-Sync signal input. Active "H". Built-in pull-down resistor. Analog 5V supply Analog RINA or YINA signal input. Sync signal is input on SYNCIN pin. ROUT/YOUT output buffer gain set input Analog RINB or YINB signal input. Sync signal is input on SYNCIN pin. No connection (leave open or connect to ground)
NIPPON PRECISION CIRCUITS INC.--3
SM5301AS
SPECIFICATIONS
Absolute Maximum Ratings
Parameter Supply voltage range Storage temperature range Power dissipation 11 Power dissipation 22 Symbol VCC Tstg PD1 PD2 Rating - 0.3 to 7.0 - 55 to + 125 1.0 0.9 Unit V C W W
1. When mounted on a substrate: mounted on a 111 x 80 x 1.6mm glass-epoxy substrate with 90% copper (Cu) wiring factor, 0m/s air flow, and Ta = - 25 to 70 C. 2. When mounted on a substrate: mounted on a 111 x 80 x 1.6mm glass-epoxy substrate with 90% copper (Cu) wiring factor, 0m/s air flow, and Ta = 70 to 80 C.
Recommended Operating Conditions
Parameter Supply voltage ranges Operating temperature range Symbol VCC Ta Rating 4.5 to 5.5 - 25 to 85 Unit V C
Electrical Characteristics
VCC = 4.5 to 5.5V, Ta = - 25 to 85C unless otherwise noted.
Rating Parameter Symbol Condition min Supply current 1 ICC1 VCC = 5.5V, RFC = 820 to GND, VFC = 0.2V (fc = 5MHz), DISABLE = "L" VCC = 5.5V, RFC = 820 to GND, VFC = 1.6V (fc = 40MHz), DISABLE = "L" VCC = 5.5V, RFC = 820 to GND, VFC = 0.2V (fc = 40MHz), DISABLE = "H" Error entered around table 1 values, Ta = 0 to 70C, VCC = 4.75 to 5.25V Error entered around table 1 values, Ta = - 25 to 85C RL = 75 to GND, 6dB gain setting RINA/YINA, RINB/YINB, GINA/UINA, GINB/UINB, BINA/VINA, BINB/VINB Time for 90% output signal change for 10mV input signal, CIN = 0.1F AC coupling, 6dB gain setting 2Vp-p output pulse BOUT/VOUT, GOUT/UOUT, ROUT/YOUT one load unit = 150 Between R/G/B, fc/2 [Hz] 70 typ 100 max 130 mA Unit Test level
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Supply current 2
ICC2
90
120
160
mA
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Supply current 3
ICC3 AV1 AV2 Vout2 RIN1 Tclamp VI VOS CL RL dG
1
2.5
5
mA
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Output gain error 1 Output gain error 2 Output voltage DISABLE-mode input impedance (pull-down) Clamp response time Maximum input amplitude Maximum overshoot Maximum load capacitance Output drive load Channel-to-channel gain difference
- 0.5 -1 2.4 - - - - - - -
- - - 50 8 - 10 - - -
+ 0.5 +1 - - - 1.4 - 15 2 0.5
dB dB Vp-p k ms Vp-p % pF load dB
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NIPPON PRECISION CIRCUITS INC.--4
SM5301AS
Rating Parameter Channel-to-channel phase difference Output harmonic distortion Power supply rejection ratio Output short-circuit current Logic HIGH-level input voltage 1 Logic LOW-level input voltage 1 Logic HIGH-level input voltage 2 Logic LOW-level input voltage 2 Logic pull-up resistance Logic pull-down resistance Symbol Condition min typ 3.5 1.5 35 - - - - - 40 50 max - - - 100 - 1.0 - 0.5 - - degree % dB mA V V V V k k Unit
Test level II II II II I I I I I I
d
THD PSRR ISC VIH1 VIL1 VIH2 VIL2 RIN2 RIN3
Between R/G/B, fc/2 [Hz] Vout = 2Vp-p, f = 1MHz VCC = 0.5Vp-p, f = 100kHz
- - - -
DISABLE, MUXSEL, SYNCIN DISABLE, MUXSEL, SYNCIN GSB1, GSG1, GSR1 GSB1, GSG1, GSR1 GSB1, GSG1, GSR1 DISABLE, MUXSEL, SYNCIN
2.5 - VCC - 0.5 - - -
Filter Characteristics
VCC = 4.5 to 5.5V, Ta = - 25 to 85C unless otherwise noted.
Rating Parameter Cutoff frequency adjustment range Cutoff frequency error 4fc attenuation Output noise characteristic Crosstalk Multiplexer crosstalk Channel-to-channel group delay Symbol Condition min FC FC fSB VNOISE XTALK XTALK TPD TPD1 Ta=25C (see figure 1) Ta = 25C, VCC = 5.0V fIN 4fc 10kHz to 40MHz, 6dB output gain setting Between 2 channels with input 0.5Vp-p 1MHz Between MUX A-B Each input = 500kHz Fc = 6.7MHz (500kHz) to 3.58MHz to 4.43MHz to 3.58MHz Group delay variation TPD2 Fc = 24MHz (500kHz) to 4.43MHz to 10MHz TPD3 VFC input voltage range VFC Fc = 36MHz (1MHz) to 10MHz to 30MHz 5.8 - - - - - - - - - - - - - 0.2 typ - - 50 1.0 - 47 - 49 10 9 15 1 1 2 0.5 5 - max 37 20 - - - - - - - - - - - - 1.6 MHz % dB mVRMS dB dB ns ns ns ns ns ns ns ns V Unit Test level I I II II II II II II II II II II II II I
Test level I : 100% of products tested at Ta = + 25C. II : Guaranteed as result of design and characteristics evaluation.
NIPPON PRECISION CIRCUITS INC.--5
SM5301AS
Table 1. Output buffer gain control
GSx1 GND VCC or Open Gain [dB] 0 6
45 40 35 30 fc [MHz] 25 20 15 10 5 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
VFC [V]
RFC: 820 to GND
Figure 1. VFC vs. cutoff frequency
NIPPON PRECISION CIRCUITS INC.--6
SM5301AS
2.00E+01 6dB 0.00E+00 0dB Gain [dB] -2.00E+01
-4.00E+01
-6.00E+01
-8.00E+01 1.00E+03
1.00E+04
1.00E+05
1.00E+06
1.00E+07
1.00E+08
Frequency [Hz]
Figure 2. Frequency response (VFC = 0.2V)
2.00E+01 6dB 0.00E+00 Gain [dB] 0dB -2.00E+01
-4.00E+01
-6.00E+01 1.00E+03
1.00E+04
1.00E+05
1.00E+06
1.00E+07
1.00E+08
Frequency [Hz]
Figure 3. Frequency response (VFC = 1.0V)
2.00E+01
6dB 0.00E+00 Gain [dB] 0dB
-2.00E+01
-4.00E+01 1.00E+03
1.00E+04
1.00E+05
1.00E+06
1.00E+07
1.00E+08
Frequency [Hz]
Figure 4. Frequency response (VFC = 1.6V)
NIPPON PRECISION CIRCUITS INC.--7
SM5301AS
Adjusting the Cutoff Frequency
Constant-voltage control 1 Cutoff frequency control using a reference voltage VR generated by voltage divider formed by R1 and R2.
VR R1 VFC
R2
RFC
Constant-voltage control 2 Cutoff frequency control by adjusting the resistance connected to RFC.
VFC VR
RFC
PWM control Cutoff frequency control by smoothing the PWM signal, using R1 and C1, input to VFC.
PWM
R1
VFC C1
RFC
When VFC = 0.2V VDD = 3.3V, 6% duty drive VDD = 5.0V, 4% duty drive When VFC = 1.6V VDD = 3.3V, 48% duty drive VDD = 5.0V, 32% duty drive Note: The resistor connected to RFC can affect the cutoff frequency response, so a high-precision component should be used. It is recommended to set the RC filter cutoff frequency to < fc/100 of the PWM waveform frequency.
NIPPON PRECISION CIRCUITS INC.--8
SM5301AS Resistor switch control The VFC voltage can be controlled using multi-logic voltage levels switching inputs to a voltage divider resistor network.
V1 V2 V3
R1 R2 R3
VFC
RFC R0
The VFC voltage is determined by the logic voltage (V1, V2, V3) and the corresponding voltage divider resistor network.
NIPPON PRECISION CIRCUITS INC.--9
SM5301AS
TYPICAL APPLICATION CIRCUITS
ATSC Digital TV Application
820
Cut-off control voltage SYNC RIN/YIN GSR1
+5V
+
(*3)
+
R/Y
75
1.0F
(*4) (*1)
220F
(*2) (*2)
MUXSEL
SYNCIN
GSR1
VCC4
VCC1
RINB/YINB
RINA/YINA
GND4
ROUT/YOUT
GND1 GND2
BOUT/VOUT
GINA/UINA
GINB/UINB
BINA/VINA
BINB/VINB
DISABLE
GSG1
GND3
GSB1
GIN/UIN GSG1
VCC3
NC
NC
GOUT/UOUT
VCC2
VFC
NC
RFC
1.0F
(*4)
(*1)
(*1) (*2) (*2)
+
G/U
75
220F
+
B/V
75
BIN/VIN GSB1 DISABLE
220F 1.0F
(*4)
(*1) Pins without an input signal, set by NUXSEL, should be left open or tied to GND. (*2) Connect 4 x 0.1F capacitor between the supply pins close to the IC. (*3) Connect a 47F capacitor between the supply pins close to the IC. (*4) GSx1 are 3-level pins. Connect a capacitor if an error occurs due to external noise. Also, if open-circuit, the internal impedance and external capacitance (C) form an RC network. When power is applied, the open-circuit potential rises with time constant = C x 10k (sec). (*5) Printed circuit board supply wiring
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If the supply is used for other digital circuits, there is a possibility that noise will be introduced. Accordingly, these circuits should be connected to the application's analog supply. Ground-plane wiring should be performed, as much as possible, to provide low GND line impedance. If ground-plane wiring up to the GND pins is difficult, the ground plane should be as close to the IC as possible with a separate wire to each GND pin.
Input Capacitor and Cutoff Frequency
The capacitor connected to pins RINA/YINA, RINB/YINB, GINA/UINB, GINB/UINB, BINA/VINA, and BINB/VINB forms a highpass filter (HPF) with the internal impedance. The HPF cutoff frequency is given by the following equation. fc = 1 2CR (C: input capacitance, R: signal input impedance = 9.3k)
NIPPON PRECISION CIRCUITS INC.--10
SM5301AS
2-load Output Connection
ROUT/YOUT output 2-load connection (similarly for GOUT/UOUT , BOUT/VOUT outputs)
220F
75
ROUT/YOUT
+
R/Y1
75
R/Y2
Digital TV Receiver and HDTV Decoder Box
Graphic Processor
MPEG2 Transport/Decoder
HDTV Decoder/Display Processor
D to A Convertor
SM5301
DIGITAL TV
CAMERA
Video Decoder and Display Processor
D to A Convertor
SM5301
RGB MONITOR
DVD-ROM MEMORY
Graphic Processor
NIPPON PRECISION CIRCUITS INC.--11
SM5301AS
Please pay your attention to the following points at time of using the products shown in this document. The products shown in this document (hereinafter "Products") are not intended to be used for the apparatus that exerts harmful influence on human lives due to the defects, failure or malfunction of the Products. Customers are requested to obtain prior written agreement for such use from NIPPON PRECISION CIRCUITS INC. (hereinafter "NPC"). Customers shall be solely responsible for, and indemnify and hold NPC free and harmless from, any and all claims, damages, losses, expenses or lawsuits, due to such use without such agreement. NPC reserves the right to change the specifications of the Products in order to improve the characteristic or reliability thereof. NPC makes no claim or warranty that the contents described in this document dose not infringe any intellectual property right or other similar right owned by third parties. Therefore, NPC shall not be responsible for such problems, even if the use is in accordance with the descriptions provided in this document. Any descriptions including applications, circuits, and the parameters of the Products in this document are for reference to use the Products, and shall not be guaranteed free from defect, inapplicability to the design for the mass-production products without further testing or modification. Customers are requested not to export or re-export, directly or indirectly, the Products to any country or any entity not in compliance with or in violation of the national export administration laws, treaties, orders and regulations. Customers are requested appropriately take steps to obtain required permissions or approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome, Koto-ku, Tokyo 135-8430, Japan Telephone: +81-3-3642-6661 Facsimile: +81-3-3642-6698 http://www.npc.co.jp/ Email: sales@npc.co.jp
NC0202BE 2003.05
NIPPON PRECISION CIRCUITS INC.--12

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