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GB4571-CDA 반도체 회로 부품 판매점

Video Buffer with Precision Strobed DC Restore



ETC 로고
ETC
GB4571-CDA 데이터시트, 핀배열, 회로
GB4571 Video Buffer with
Precision Strobed DC Restore
DATA SHEET
FEATURES
DESCRIPTION
accurate clamping to within ± 1 mV
less than 1 mV clamping distortion
variable clamping range (VEE + 3.0 V to VCC - 4.5 V)
ultra low differential gain and differential phase
fast recovery from sudden changes in DC offsets
less than ± 0.15° phase delay variation at 3.58 MHz
± 0.1 dB flatness to 80 MHz
± 4.5 V to ±13.2 V supply voltage range
PIN CONNECTIONS
GB4571
C HOLD
VIN
VCLAMP
STROBE
1
2
3
4
8
7
6
5
VCC
VOUT
VEE
GND
AVAILABLE PACKAGING
The GB4571 is a high performance video buffer with DC
restore used primarily for accurate back porch clamping. Key
features include operation from ± 4.5 V to ± 13.2 V supply
voltages, fast recovery from sudden changes in DC offset,
± 0.1 dB flatness to 80 MHz and availability of industry standard
DIP and SOIC packages.
In the typical back porch clamping application, a negative
going back porch pulse from an external sync separator (such
as the GS4881 or GS4882) is applied to the GB4571's STROBE
input. While STROBE is low, the GB4571 determines the
correct DC level shift that should be applied to the input signal
by integrating over the entire back porch period. This reduces
sensitivity to noise and improves the accuracy of the DC
restoration compared to systems using sample and hold
techniques. Typical clamping accuracy of ± 1 mV is achieved
by the GB4571.
APPLICATIONS
• Clamping of NTSC, PAL, SECAM & RGB Video Signals
• Multimedia Graphics Overlay
• Production Switchers
• Linear Keyers
SIMPLIFIED CIRCUIT DIAGRAM
VCC
8
8 pin PDIP
8 pin SOIC
ORDERING INFORMATION
VIN 2
COUPLING
CAP
Part Number
GB4571-CDA
GB4571-CKA
GB4571-CTA
Package
Temperature Range
8 pin PDIP
0° to 70°C
8 pin SOIC
0° to 70°C
8 pin SOIC Tape 0° to 70°C
NON-LNEAR
V TO I
CONVERTER
HIGH Z
BUFFER
-
+
5
GND
1
CHOLD
7 VOUT
6 VEE
3 VCLAMP
4 STROBE
Document No. 521 - 17 - 01
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-2055
Japan Branch: A-302, Miyamae Village, 2-10-42, Miyamae, Suginami-ku, Tokyo 168, Japan tel. (03) 3247-8838 fax. (03) 3247-8839


GB4571-CDA 데이터시트, 핀배열, 회로
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VALUE/UNITS
Supply Voltage
± 13.5 V
Operating Temperature Range
0°C TA 70°C
Storage Temperature Range
-65°C TS 150°C
Lead Temperature (soldering, 10 seconds)
260°C
Differential Video Input Voltage
±5 V
Strobe Input Voltage
-VS VSTROBE +VS
CAUTION
ELECTROSTATIC
SENSITIVE DEVICES
DO NOT OPEN PACKAGES OR HANDLE
EXCEPT AT A STATIC-FREE WORKSTATION
ELECTRICAL CHARACTERISTICS VS = ±5 V, TA = 0° to 70°C, RL = 10k, CL = 10 pF, unless otherwise shown.
PARAMETER
SYMBOL
CONDITIONS
POWER
SUPPLIES
Supply Voltage
+ Supply Current
- Supply Current
Small Signal B.W.
(flattened response)
±V
S
I+
I-
B.W.
±0.1 dB after insertion loss,
VIN=100 mV p-p
Phase Delay
Differential Gain
øD at 3.58 MHz and 4.43 MHz
g at 3.58 MHz and 4.43 MHz
Differential Phase
p at 3.58 MHz and 4.43 MHz
Input Voltage
Input Resistance
Input Capacitance
Output Resistance
VIN
RIN
CIN
ROUT
ƒ= 0 to 1 MHz
ƒ= 100 MHz
SIGNAL
PATH
Insertion Loss
Power Supply Rejection Ratio
I.L.
PSRR
ƒ= 100 kHz
ƒ= 1 kHz
ƒ= 10 MHz
PP Signal / RMS Noise
Strobe Pulse Width
Accuracy
S/N VSIG=1 Vp-p
tPWL Active low
VIN = 0.5V to 2Vp-p,
STROBE pulses at H rate
Recovery Time
Scan rate 15.7kHz & 2µs strobe pulses
0.5V offset
0.1V offset
Clamping Distortion
Distortion amplitude
VCLAMP
STROBE
Clamp Voltage Range
Input Logic High
Input Logic Low
Strobe Input Current
VCLAMP
VIH
VIL
IIL, IIH
Distortion duration (amp. within 0.1 mV)
VIN= 1 Vp-p
NOTE:
1. VA or B = +1 Vp-p output taken from OUTPUT
2 . VC = +1 Vp-p output taken from VA or VB
MIN
± 4.5
-
-
80
TYP
± 5.0
10
10
-
-2.85
-
-
VEE+3
25
-
-
-
-
50
20
75
2.0
-
-3.0
0.01
0.01
-
-
2.0
8.6
20
0.03
-
-
-
2.5
±1
-
-
-
-
VEE+3
1.8
-
-
1
190
-
-
-
-
-
-
MAX UNITS
± 13.2
15
15
-
V
mA
mA
MHz
-3.15
0.03
0.05
VCC-3
-
-
10
40
0.05
-
-
-
-
±2
deg
%
deg
V
k
pF
dB
dB
dB
dB
µs
mV
3
600
±1
3
VCC-4.5
-
0.8
20
ms
µs
mV
µs
V
V
V
µA
521 - 17 - 00
2




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GB4571-CDA

Video Buffer with Precision Strobed DC Restore - ETC