AD8150AST Analog Devices Inc, AD8150AST Datasheet - Page 25

• Manufacturer Part Number: AD8150AST
• Description: IC CROSSPOINT SWIT 33X17 184LQFP
• Manufacturer: Analog Devices Inc

Specifications of AD8150AST

• Rohs Status: RoHS non-compliant
• Function: Crosspoint Switch
• Circuit: 1 x 33:17
• Voltage Supply Source: Dual Supply
• Voltage - Supply, Single/dual (±): ±3 V ~ 5.5 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 184-LQFP
• Number Of Arrays: 1
• Differential Data Transmission: Yes
• Operating Supply Voltage (typ): Not RequiredV
• Mounting: Surface Mount
• Operating Temperature (max): 85C
• Cascading Capability: No
• Line Code: NRZ
• On-chip Buffers: Yes
• On-chip Mux/demux: No
• Operating Supply Voltage (max): Not RequiredV
• Operating Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (typ): 3.3V
• Lead Free Status / RoHS Status: Not Compliant

The resistor value current is given by the following expression:
Example:
The minimum set resistor is R
25 mA. The maximum set resistor is R
I
in a 50 Ω load using R
doubly terminated 75 Ω load using R
21.3 mA).
To minimize stray capacitance and avoid the pickup of
unwanted signals, the external set resistor should be located
close to the REF pin. Bypassing the set resistor is not
recommended.
POWER SUPPLIES
There are several options for the power supply voltages for the
AD8150, because there are two separate sections of the chip that
require power supplies. These are the control logic and the high
speed data paths. The voltage levels of these supplies can vary,
depending on the system architecture.
Logic Supplies
The control (programming) logic is CMOS and is designed to
interface with any of the various standard single-ended logic
families (CMOS or TTL). Its supply voltage pins are V
170, logic positive) and V
the logic ground should be connected to the system digital
ground. V
5 V to match the supply voltage of the logic family that is used
to drive the logic inputs. V
with a 0.1 μF ceramic capacitor. The absolute maximum voltage
from V
Data Path Supplies
The data path supplies have more options for their voltage
levels. The choices here will affect several other areas, such as
power dissipation, bypassing, and common-mode levels of the
inputs and outputs. The more positive voltage supply for the
data paths is V
supply is V
here. The maximum allowable voltage across these supplies is
5.5 V.
OUT,min
R
R
SET
SET
= 5 mA. Nominal 800 mV output swings can be achieved
DD
to V
DD
=
=
EE
. 1
I
, which appears on many pins that will not be listed
should be supplied at a voltage between 3.3 V and
25
OUT
54
SS
CC
is 5.5 V.
kΩ
(Pins 41, 98, 149, and 171). The more negative
for
SET
I
= 1.56 kΩ (I
SS
OUT
DD
(Pin 152, logic ground). In all cases
should be bypassed to ground
SET,min
=
16
2 .
= 1 kΩ, resulting in I
mA
SET
OUT
SET,max
= 1.17 kΩ (I
= 16.2 mA) or in a
= 5 kΩ, resulting in
OUT
DD
OUT,max
=
(Pin
Rev. A | Page 25 of 44
=
The first choice in the data path power supplies is to decide
whether to run the device as ECL (emitter-coupled logic) or
PECL (positive ECL). For ECL operation, V
potential, and V
and −5 V. This will make the common-mode voltage of the
inputs and outputs a negative voltage (see Figure 38).
If the data paths are to be dc-coupled to other ECL logic devices
that run with ground as the most positive supply and a negative
voltage for V
the part is to be ac coupled, it is not necessary to have the
input/output common mode at the same level as the other
system circuits, but it will probably be more convenient to use
the same supply rails for all devices.
For PECL operation, V
will be a positive voltage from 3.3 V to 5 V. Thus, the common
mode of the inputs and outputs will be at a positive voltage.
These can then be dc coupled to other PECL operated devices.
If the data paths are ac coupled, then the common-mode levels
do not matter, see Figure 39.
0.1μF
AD8150
0.1μF
Figure 39. Power Supplies and Bypassing for PECL Operation
Figure 38. Power Supplies and Bypassing for ECL Operation
AD8150
CONTROL
3V TO 5V
LOGIC
GND
EE
CONTROL
3V TO 5V
LOGIC
V
V
, then this is the proper way to run. However, if
GND
DD
SS
EE
V
V
will be at a negative supply between −3.3 V
DD
SS
EE
3V TO 5V
will be at ground potential, and V
PATHS
DATA
GND
3V TO 5V
PATHS
V
V
DATA
CC
EE
GND
V
V
CC
EE
0.1μF
(ONE FOR EVERY TWO V
0.1μF
(ONE FOR EACH V
4 REQUIRED)
CC
will be at ground
CC
AD8150
EE
PIN,
PINS)
CC