el1503a Intersil Corporation, el1503a Datasheet - Page 15

• Manufacturer Part Number: el1503a
• Description: High Power Differential Line Driver
• Manufacturer: Intersil Corporation

Power Control Function
The EL1503A contains two forms of power control operation.
Two digital inputs, C
supply current of the EL1503A drive amplifiers. As the
supply current is reduced, the EL1503A will start to exhibit
slightly higher levels of distortion and the frequency
response will be limited. The 4 power modes of the EL1503A
are set up as shown in the table 2.
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notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
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C
0
0
1
1
1
TABLE 2. POWER MODES of the EL1503A
C
0
1
0
1
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0
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0
I
2/3 I
1/3 I
Power down
S
and C
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full power mode (CO or CP)
S
S
power mode (CO or CP)
terminate only mode
1
15
, can be used to control the
OPERATION
EL1503A
I
Another method for controlling the power consumption of the
EL1503A is to connect a resistor from the I
When this pin is grounded (the normal state), the supply
current per channel is as per the specifications table on page
3. When a resistor is inserted, the supply current is scaled
according to the “I
Performance Curves section.
Both methods of power control can be used simultaneously.
In this case, positive and negative supply currents (per amp)
are given by the equations below:
I
+
S
+
S
+
(
-
(
C
C
=
=
0
0
×
0
1mA
×
1 3 )
+
1 3 )
⁄
(
⁄
C
+
1
×
(
×
×
C
------------------------------------------ -
1 (
------------------------------------------ -
1 (
2 3 )
1
⁄
×
+
+
12.5mA
S
2 3 )
12.5mA
R
R
⁄
SET
×
vs R
SET
------------------------------------------ -
1 (
×
+
÷
SET
÷
------------------------------------------ -
1 (
12.5mA
1k )
R
1k )
SET
+
” graphs on page 10 in the
12.5mA
R
SET
÷
1k )
÷
1k )
ADJ
pin to ground.
March 26, 2007
FN7039.2