ML4621 Datasheet, PDF (1/8 Pages) Micro Linear Corporation – Data Quantizer

February 1998
ML4621
Data Quantizer
GENERAL DESCRIPTION
FEATURES
The ML4621 data quantizer is a low noise, wideband
monolithic IC designed specifically for signal recovery
s 50MHz minimum bandwidth for data rates of up to
100MBd
applications in fiber-optic receiver systems. It contains a
two stage wideband limiting amplifier which is capable
of accepting an input signal as low as 2mV with a 55dB
s Can be powered by either 5V providing TTL level
outputs, or -5.2V providing ECL level outputs
dynamic range. This high level of sensitivity is achieved
by using a DC restoration feedback loop which nulls any
s Low noise design: 25µV RMS over 50MHz noise
offset voltage produced in the limiting amplifier.
ns ^{The output stage is a high speed comparator circuit with}
ig ^{both TTL and ECL outputs. An enable pin is included for}
added control.
es _{The minimum signal discriminator circuit provides a link}
D _{monitor function with a user selectable reference voltage.}
w This circuit monitors the peaks of the input signal and
e _{provides a logic level output indicating when the input}
N _{falls below an acceptable level. This output can be used}
r _{to disable the quantizer and/or drive an LED, providing a}
fo ^{visible link status.}
bandwidth
s Adjustable link monitor function
s Wide 55dB input dynamic range
s 10ns minimum input pulse
L4624 _{BLOCK DIAGRAM (Pin Configuration Shown is for PLCC Version)}
e ^ML4622/M _VIN+
e 6
VIN–
S ₅
lease ^VDC
P ⁸
10
9
12
CF1 CF2 VOUT+
11
13
14
VOUT– CMP+ CMP–
17
16
ECL+ ECL–
VCC
28
VCC TTL
19
A1
A2
ECL
CMP
TTL
CMP
TTL OUT
20
DC
AMP
FILTER
CMP ENABLE
3
VREF
23
VTHADJ
22
REF
THRESHOLD
GENERATOR
MINIMUM
SIGNAL
DISCRIMINATOR
INOM ISET
27
26
CPEAK
24
ECL LINK MON
1
TTL LINK MON
2
GND TTL
18
GND
21
1