
3
AC Test Circuit
PC Board Layout
The frequency response of this circuit depends greatly on
the care taken in designing the PC board.
The use of low
inductance components such as chip resistors and chip
capacitors is strongly recommended, while a solid
ground plane is a must!
Attention should be given to decoupling the power supplies.
A large value (10
μ
F) tantalum in parallel with a small value
(0.1
μ
F) chip capacitor works well in most cases.
Keep input and output traces as short as possible, because
trace inductance and capacitance can easily become the
performance limiting items.
Application Information
General
The HA4314B is a 4 x 1 crosspoint switch that is ideal for the
matrix element of high performance switchers and routers.
This crosspoint’s low input capacitance and high input
resistance provide excellent video terminations when used
with an external 75
resistor. Nevertheless, if several
HA4314B inputs are connected together, the use of an input
buffer should be considered (see Figure 1). This crosspoint
contains no feedback or gain setting resistors, so the output
is a true high impedance load when the IC is disabled
(CS = 1).
Ground Connections
All GND pins are connected to a common point on the die,
so any one of them will suffice as the functional GND
connection. For the best isolation and crosstalk rejection,
however, all GND pins must connect to the GND plane.
Frequency Response
Most applications utilizing the HA4314B require a series
output resistor, R
S
, to tune the response for the specific load
±
0.1dB Flat Bandwidth
R
S
= 50
, C
L
= 10pF
R
S
= 20
, C
L
= 20pF
R
S
= 16
, C
L
= 36pF
R
S
= 13
, C
L
= 49pF
25
-
100
-
MHz
25
-
100
-
MHz
25
-
85
-
MHz
25
-
75
-
MHz
Input Resistance
Full
200
400
-
k
Input Capacitance
Full
-
1.5
-
pF
Enabled Output Resistance
Full
-
15
-
Disabled Output Capacitance
V
CS
= 2.0V
4.43MHz, Note 3
Full
-
2.5
-
pF
Differential Gain
25
-
0.01
0.02
%
Differential Phase
4.43MHz, Note 3
25
-
0.01
0.02
Degrees
Off Isolation
1V
P-P
, 100MHz, V
CS
= 2.0V,
R
L
= 10
1V
P-P
, 30MHz
R
S
= 50
, C
L
= 10pF
R
S
= 20
, C
L
= 20pF
R
S
= 16
, C
L
= 36pF
R
S
= 13
, C
L
= 49pF
10MHz, R
L
= 1k
, Note 3
V
CS
= 2.0V
Full
-
70
-
dB
Crosstalk Rejection
Full
-
80
-
dB
Slew Rate (1.5V
P-P
, +SR/-SR)
25
-
1425/1450
-
V/
μ
s
V/
μ
s
V/
μ
s
V/
μ
s
25
-
1010/1010
-
25
-
725/750
-
25
-
600/650
-
Total Harmonic Distortion
Full
-
0.01
0.1
%
Disabled Output Resistance
Full
-
12
-
M
NOTES:
3. This parameter is not tested. The limits are guaranteed based on lab characterization, and reflect lot-to-lot variation.
4. Units are 100% tested at 25
o
C; Guaranteed but not tested at 0
o
C and 70
o
C.
Electrical Specifications
V
SUPPLY
=
±
5V, R
L
= 10k
, V
CS
= 0.8V, Unless Otherwise Specified
(Continued)
PARAMETER
TEST CONDITIONS
(NOTE 4)
TEMP. (
o
C)
MIN
TYP
MAX
UNITS
HA4314
R
S
C
X
75
HFA1100
75
V
OUT
V
IN
10k
500
400
510
+
-
NOTE:
C
L
= C
X
+ Test Fixture Capacitance.
HA4314B