ML6423 Datasheet, PDF (1/10 Pages) Micro Linear Corporation – Dual S-Video Lowpass Filter with Phase and Sinx/x Equalization

June 1999
PRELIMINARY
ML6423*
Dual S-Video Lowpass Filter with
Phase and Sinx/x Equalization
GENERAL DESCRIPTION
The ML6423 monolithic BiCMOS 6th-order filter provides
a two-channel fixed frequency lowpass filtering for video
applications. This dual phase equalized filter with sinx/x
correction is designed for reconstruction filtering at the
output of a Video DAC. A composite sum output
eliminates the need for a third DAC.
Cutoff frequencies are either 5.5MHz or 9.6MHz. Each
channel incorporates a 6th-order lowpass filter, a first
order allpass filter, a gain boost circuit, and a 75W coax
cable driver. A control pin (RANGE) is provided to allow
the inputs to swing from 0 to 1V, or 0.5 to 1.5V, by
providing a 0.5V offset to the input.
The 2X gain filters are powered from a single 5V supply,
and can drive 1V_P-P into 75W (0.5V to 1.5V), or 2V_P-P into
150W (0.5V to 2.5V) with the internal coax drivers.
BLOCK DIAGRAM
10
VCCB
7
VCCC
FEATURES
s 5.5 or 9.6MHz bandwidth with 6dB gain
s >40dB stopband rejection
s No external components or clocks
s ±10% frequency accuracy over maximum supply
and temperature variation
s <2% differential gain, <2° differential phase
s <20ns group delay variation
s 5V ±10% operation
s Composite (sum) output
s High sink current for AC coupled loads, ML6423-5
* This Product Is End Of Life As Of August 1, 2000
4
13
VCC
VCCA
V_INA (Y)
16
BUF
2kΩ
IBIAS
2kΩ
15 RANGE
LOWPASS
FILTER A
ALLPASS
SINX/X
2X
FILTER EQUALIZER BUF
∑
2X
BUF
VOUTA (Y)
12
3.43kΩ
V_OUTB (CV)
8
3.43kΩ
VINC (C)
1
BUF
2kΩ
IBIAS
2kΩ
LOWPASS
FILTER C
ALLPASS
SINX/X
2X
FILTER EQUALIZER BUF
V_OUTC (C)
6
3.43kΩ
GND
2
GNDA
14
Filter A
Filter C
ML6423-1
5.50MHz
5.50MHz
GNDC
3
ML6423-2
9.6MHz
9.6MHz
GNDB
9
ML6423-5
9.6MHz
9.6MHz
1