ZETEX ZXFV4089 Technical data
VIDEO AMPLIFIER WITH DC RESTORATION
ZXFV4089
DEVICE DESCRIPTION
The ZXFV4089 is a DC restoring circuit and
low-distortion video amplifier. It is specially designed
to provide brightness level stability as a ‘black-level
clamp’ in video systems with very low distortion and
low power consumption.
A high fidelity video amplifier is combined with a
sample-hold switch circuit using an external coupling
capacitor to provide level-shifting of the video output
suchthatatime-gated sampleof thewaveform isset to
be equal to an externalreferencevoltage (usually zero
voltage). A buffered TTL/CMOS logic input signal
controls the switch.
The gain is set externally by two resistors.
Inatypical application,the sample-holdcircuit isgated
on during part ofthe back-porch interval of an analog
video waveform. Then the video waveform is
stabilised for the remainder of the line-scan interval.
ORDERING INFORMATION
Part Number Container Increment
ZXFV4089N8TA
ZXFV4089N8TC
Reel 7″
Reel 13″
500
2500
FEATURES AND BENEFITS
Various TV systems, PAL, NTSC, SECAM
•
Buffered output using high quality video amplifier
•
Gain is set using two external resistors
•
On chip sample/hold capacitor
•
300 MHz bandwidth
•
0.02% differential gain
•
0.02° differential phase
•
+/-5V supply operation
•
8 mA supply current
•
Pin and function compatible with industry
•
standard part
APPLICATIONS
•
Black Level Clamp, providing stable intensity in
video systems such as
cameras
image capture
video mixing
displays
•
DC restoration of other high frequency signals
CONNECTION DIAGRAM
ADVANCED INFORMATION ISSUE D - SEPTEMBER 2002
1
ZXFV4089
ABSOLUTE MAXIMUM RATINGS
Positive Supply voltage V
Negative Supply Voltage V
Input voltage, pins 1,2,3 to GND V
Output current, pin 7 60mA
Current into Vin and HOLD, pins 2 & 4 5mA
Operating Temperature Range -40⬚C to 85⬚C Storage -65⬚C to +150⬚C
Operating Ambient Junction temperature T
**The thermalresistance from the semiconductordie to ambientistypically 120⬚C/W whentheSO16 package is
mounted on a PCB in free air. The power dissipation of the device when loaded must be designed to keep the
device junction temperature below T
*During power-up and power-down, these voltage ratings require that signals be applied only when the power
supply is connected.
CC to GND
to GND -5.5V to +0.5V
EE
JMAX
JMAX.
ELECTRICAL CHARACTERISTICS
= 5V, VEE= -5V, RFand RG=1k⍀,R
V
CC
PARAMETER CONDITIONS P/C MIN TYP MAX UNIT
DC characteristics
Supply current, holding HOLD = HIGH P 8 10 mA
V
CC
Supply current, sampling HOLD = LOW P 8.5 11 mA
V
CC
Supply current, holding HOLD = HIGH P 8 10 mA
V
EE
Supply current, sampling HOLD = LOW P 8.5 11 mA
V
EE
Amplifier section
Input offset voltage HOLD = HIGH P 1 10 mV
+ input bias current HOLD = HIGH
– input bias current HOLD = HIGH
Transimpedance HOLD = HIGH P 500 1800 K⍀
+ input resistance HOLD = HIGH P 1.5 2 M⍀
Open loop gain HOLD = HIGH P 48 61 dB
Output voltage swing HOLD = HIGH P ±2.5 ±3.0 V
Output drive current HOLD = HIGH P 40 mA
Positive Power Supply Rejection Ratio HOLD = HIGH P 49 57 dB
Negative Power Supply Rejection Ratio HOLD = HIGH P 51 58 dB
Common mode input voltage range HOLD = HIGH C ±3 V
Amplifier output voltage swing HOLD = HIGH P ±2.5 ±3.5 V
Restore section
Composite Input Offset Voltage, from V
to amplifier output
input bias current HOLD = LOW P 3 12 µA
V
REF
Input restore current available, pin 2 HOLD = LOW P 180 300 µA
REF
= 1k, T
LOAD
HOLD = LOW
amb
-0.5V to +5.5V
-0.5V to VCC+0.5V
EE
150⬚C**
=25⬚C unless otherwisestated.
P510
P510
P37mV
µA
µA
TEST - P = 100% production tested, C = characterised
ADVANCED INFORMATION ISSUE D - SEPTEMBER 2002
2
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