Prescaler
1
DN8522S-A
Prescaler IC for CATV
s
Overview
The DN8522S-A is 1.7 GHz prescaler IC for CATV.
It is made up of ECL flip-flop circuit which can be
switched to the dividing ratios of 64, 128 or 256.
s
Features
Power dissipation: 5 V, 26 mA
To be switched to the dividing ratios of 64, 128 and 256
ECL-level output
s
Applications
Television, VCR
SOP008-P-0225A
Unit: mm
4
8
5
0.40.25
0.60.3
1.27
5.00.3
0.10.1
0.3
4.20.3
6.50.3
0.15
0.65
1.50.2
1
s
Block Diagram
V
CC
V
CC
2
Output
4
M1
3
M2
6
GND
5
Input
1
Ref.
Buff. amp.
8
Switch
1/2
1/2
1/2
1/2
1/2
1/2
1/4
1/8
GND
DN8522S-A
Prescaler
2
Parameter
Symbol
Range
Unit
Supply voltage
V
CC
4.5 to 5.5
V
s
Recommended Operating Range
s
Pin Descriptions
Parameter
Symbol
Rating
Unit
Supply voltage
V
CC
6.0
V
Supply current
I
CC
40
mA
Power dissipation
*2
P
D
160
mW
Operating ambient temperature
*1
T
opr
-
20 to
+
80
C
Storage temperature
*1
T
stg
-
55 to
+
125
C
s
Absolute Maximum Ratings
Note) 1. *1: Except for the operating ambient temperature and storage temperature, all ratings are for T
a
=
25
C.
*2: The power dissipation shown is for the IC package at T
a
=
80
C
Pin No.
Description
1
Input pin
2
Supply voltage pin
3
Dividing ratio select pin: M1
4
Output pin
5
GND pin
6
Dividing ratio select pin: M2
7
N.C.
8
Bias (Ref.) pin
s
Electrical Characteristics at T
a
=
25
C
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Supply voltage
V
CC
4.5
5.0
5.5
V
Supply current
I
CC
V
CC
=
5 V
26
36
mA
Input frequency
f
IN
V
CC
=
5.0 V, V
IN
=
-
15 dBm
0.6
1.7
GHz
Input signal level
V
IN1
V
CC
=
5.0 V, T
a
= -
20
C to 80
C
-
15
+
3
dBm
f
IN
=
0.6 GHz to 1.7 GHz
Output amplitude
V
O
V
CC
=
5 V, f
IN
=
1.7 GHz
0.6
1.0
1.6
V[p-p]
V
IN
=
-
10 dBm, divided by 64
High-level input voltage
V
IH
Dividing ratio select voltage pin 3,
0.7
V
pin 6
V
CC
Low-level input voltage
V
IL
Dividing ratio select voltage pin 3,
0.2
V
pin 6
V
CC
Prescaler
DN8522S-A
3
s
Application Circuit Example
Input
0.001
F
0.001
F
Ref.
V
CC
5 V
2
Output
4
M1
3
M2
6
GND
5
1
Buff. amp.
8
Switch
1/2
1/2
1/2
1/2
1/2
1/2
1/4
1/8
Dividing ratio select pin: M1/M2 settings and related dividing ratios are as follows: High
=
V
CC
, Low
=
GND
Pin 3
Pin 6
Dividing ratio
M1
M2
Low
Low
1/256
Low
High
1/128
High
Low
High
High
1/64
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