GB4571 Gennum Corporation, GB4571 Datasheet

no-image

GB4571

Manufacturer Part Number
GB4571
Description
Manufacturer
Gennum Corporation
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
GB4571-CKA
Manufacturer:
TI
Quantity:
101
Part Number:
GB4571-CKA
Manufacturer:
GENNUM
Quantity:
20 000
Part Number:
GB4571-CTA
Manufacturer:
GENNUM
Quantity:
301
• accurate clamping to within
• less than 1 mV clamping distortion
• variable clamping range (V
• ultra low differential gain and differential phase
• fast recovery from sudden changes in DC offsets
• less than
PIN CONNECTIONS
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-2055
FEATURES
ORDERING INFORMATION
AVAILABLE PACKAGING
GB4571-CDA
GB4571-CKA
GB4571-CTA
Part Number
Japan Branch: A-302, Miyamae Village, 2-10-42, Miyamae, Suginami-ku, Tokyo 168, Japan
0.1 dB flatness to 80 MHz
4.5 V to 13.2 V supply voltage range
C
V
V
STROBE
IN
CLAMP
HOLD
0.15 phase delay variation at 3.58 MHz
1
2
3
4
8 pin SOIC Tape
8 pin SOIC
8 pin PDIP
Package
8 pin SOIC
8 pin PDIP
GB4571
EE
8
7
6
5
+ 3.0 V to V
1 mV
V
V
V
GND
Temperature Range
CC
OUT
EE
0 to 70 C
0 to 70 C
0 to 70 C
CC
- 4.5 V)
V
IN
COUPLING
CAP
DESCRIPTION
The GB4571 is a high performance video buffer with DC
restore used primarily for accurate back porch clamping. Key
features include operation from
voltages, fast recovery from sudden changes in DC offset,
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.
• Clamping of NTSC, PAL, SECAM & RGB Video Signals
• Multimedia Graphics Overlay
• Production Switchers
• Linear Keyers
SIMPLIFIED CIRCUIT DIAGRAM
APPLICATIONS
2
0.1 dB flatness to 80 MHz and availability of industry standard
Precision Strobed DC Restore
NON-LNEAR
CONVERTER
V TO I
GB4571 Video Buffer with
5
GND
tel. (03) 3247-8838 fax. (03) 3247-8839
HIGH Z
BUFFER
V CC
8
1
4.5 V to
Document No. 521 - 17 - 01
C
HOLD
-
+
DATA SHEET
13.2 V supply
3
4
7
6
V
V
STROBE
V
OUT
EE
CLAMP

Related parts for GB4571

GB4571 Summary of contents

Page 1

... 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 ...

Page 2

ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Operating Temperature Range Storage Temperature Range Lead Temperature (soldering, 10 seconds) Differential Video Input Voltage Strobe Input Voltage ELECTRICAL CHARACTERISTICS PARAMETER Supply Voltage POWER + Supply Current SUPPLIES - Supply Current Small Signal B.W. ...

Page 3

... One input to the low pass filter senses the output of the GB4571, while the other input is connected to the clamp voltage reference. When enabled by taking STROBE low, the OTA sources or sinks current depending on whether the ...

Page 4

... NETWORK ANALYSER Sweep: 1-100MHz Level: 0dBM 75 All resistors in ohms, all capacitors in microfarads unless otherwise stated. * This input capacitor must be shorted when performing Differential Gain and Differential Phase tests. GB4571 TYPICAL PERFORMANCE CURVES 6 ø 180pF L 2 270pF L 0.0 -2 FREQUENCY (MHz) Fig. 3 Gain vs Frequency ...

Page 5

... Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. DOCUMENT IDENTIFICATION PRODUCT PROPOSAL This data has been compiled for market investigation purposes only, and does not constitute an offer for sale. ...

Related keywords