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LT1794IFE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
1
LT1794
Dual 500mA, 200MHz
xDSL Line Driver Amplifier
■
Exceeds All Requirements For Full Rate,
Downstream ADSL Line Drivers
■
±500mA Minimum I
OUT
■
±11.1V Output Swing, V
S
= ±12V, R
L
= 100Ω
■
±10.9V Output Swing, V
S
= ±12V, I
L
= 250mA
■
Low Distortion: –82dBc at 1MHz, 2V
P-P
Into 50Ω
■
Power Saving Adjustable Supply Current
■
Power Enhanced Small Footprint Packages:
20-Lead TSSOP and 20-Lead SW
■
200MHz Gain Bandwidth
■
500V/µs Slew Rate
■
Specified at ±15V, ±12V and ±5V
■
High Density ADSL Central Office Line Drivers
■
High Efficiency ADSL, HDSL2, G.lite,
SHDSL Line Drivers
■
Buffers
■
Test Equipment Amplifiers
■
Cable Drivers
The LT
®
1794 is a 500mA minimum output current, dual op
amp with outstanding distortion performance. The ampli-
fiers are gain-of-ten stable, but can be easily compensated
for lower gains. The extended output swing allows for
lower supply rails to reduce system power. Supply current
is set with an external resistor to optimize power dissipa-
tion. The LT1794 features balanced, high impedance in-
puts with low input bias current and input offset voltage.
Active termination is easily implemented for further sys-
tem power reduction. Short-circuit protection and thermal
shutdown insure the device’s ruggedness.
The outputs drive a 100Ω load to ±11.1V with ±12V
supplies, and ±10.9V with a 250mA load. The LT1794,
with its increased swing on lower supplies, can be used to
upgrade LT1795 line driver applications.
The LT1794 is available in the very small, thermally
enhanced, 20-lead TSSOP for maximum port density in
line driver applications. The 20-lead SW is also available.
, LTC and LT are registered trademarks of Linear Technology Corporation.
High Efficiency ±12V Supply ADSL Central Office Line Driver
1794 TA01
+
–
1/2
LT1794
–IN
–
+
1/2
LT1794
+IN
12V
SHDN
–12V
12.7Ω
R
BIAS
24.9k
1:2*
110Ω
1000pF
110Ω
1k
1k
12.7Ω
SHDNREF
100Ω
*COILCRAFT X8390-A OR EQUIVALENT
I
SUPPLY
= 10mA PER AMPLIFIER
WITH R
BIAS
= 24.9k
•
•
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LT1794
ORDER PART
NUMBER
Supply Voltage (V
+
to V
–
) .................................... ±18V
Input Current ..................................................... ±10mA
Output Short-Circuit Duration (Note 2)........... Indefinite
Operating Temperature Range ............... –40°C to 85°C
LT1794CFE
LT1794IFE
T
JMAX
= 150°C, θ
JA
= 40°C/W, θ
JC
= 3°C/W (Note 4)
Consult factory for parts specified with wider operating temperature ranges.
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
Specified Temperature Range (Note 3).. –40°C to 85°C
Junction Temperature.......................................... 150°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
(Note 1)
ORDER PART
NUMBER
LT1794CSW
LT1794ISW
1
2
3
4
5
6
7
8
9
10
TOP VIEW
SW PACKAGE
20-LEAD PLASTIC SO
20
19
18
17
16
15
14
13
12
11
NC
V
+
OUT
V
–
V
–
V
–
V
–
–IN
+IN
SHDN
NC
V
+
OUT
V
–
V
–
V
–
V
–
–IN
+IN
SHDNREF
1
2
3
4
5
6
7
8
9
10
TOP VIEW
20
19
18
17
16
15
14
13
12
11
V
–
NC
–IN
+IN
SHDN
SHDNREF
+IN
–IN
NC
V
–
V
–
NC
OUT
V
+
NC
NC
V
+
OUT
NC
V
–
FE PACKAGE
20-LEAD PLASTIC TSSOP
T
JMAX
= 150°C, θ
JA
= 40°C/W, θ
JC
= 3°C/W (Note 4)
UNDERSIDE METAL CONNECTED TO V
–
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full specified temperature range, otherwise specifications are at T
A
= 25°C.
V
CM
= 0V, pulse tested, ±5V ≤ V
S
≤ ±15V, V
SHDNREF
= 0V, R
BIAS
= 24.9k between V
+
and SHDN unless otherwise noted. (Note 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OS
Input Offset Voltage 15.0 mV
● 7.5 mV
Input Offset Voltage Matching 0.3 5.0 mV
● 7.5 mV
Input Offset Voltage Drift ● 10 µV/°C
I
OS
Input Offset Current 100 500 nA
● 800 nA
I
B
Input Bias Current ±0.1 ±4 µA
● ±6 µA
Input Bias Current Matching 100 500 nA
● 800 nA
e
n
Input Noise Voltage Density f = 10kHz 8 nV/√Hz
i
n
Input Noise Current Density f = 10kHz 0.8 pA/√Hz
R
IN
Input Resistance V
CM
= (V
+
– 2V) to (V
–
+ 2V) ● 550 MΩ
Differential 6.5 MΩ
3
LT1794
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
C
IN
Input Capacitance 3pF
Input Voltage Range (Positive) (Note 5) ● V
+
– 2 V
+
– 1 V
Input Voltage Range (Negative) (Note 5)
● V
–
+ 1 V
–
+ 2 V
CMRR Common Mode Rejection Ratio V
CM
= (V
+
– 2V) to (V
–
+ 2V) 74 83 dB
● 66 dB
PSRR Power Supply Rejection Ratio V
S
= ±4V to ±15V 74 88 dB
● 66 dB
A
VOL
Large-Signal Voltage Gain V
S
= ±15V, V
OUT
= ±13V, R
L
= 100Ω 70 82 dB
● 64 dB
V
S
= ±12V, V
OUT
= ±10V, R
L
= 40Ω 63 76 dB
● 57 dB
V
S
= ±5V, V
OUT
= ±3V, R
L
= 25Ω 60 70 dB
● 54 dB
V
OUT
Output Swing V
S
= ±15V, R
L
= 100Ω 13.8 14.0 ±V
● 13.6 ±V
V
S
= ±15V, I
L
= 250mA 13.6 13.9 ±V
● 13.4 ±V
V
S
= ±12V, R
L
= 100Ω 10.9 11.1 ±V
● 10.7 ±V
V
S
= ±12V, I
L
= 250mA 10.6 10.9 ±V
● 10.4 ±V
V
S
= ±5V, R
L
= 25Ω 3.7 4.0 ±V
● 3.5 ±V
V
S
= ±5V, I
L
= 250mA 3.6 3.9 ±V
● 3.4 ±V
I
OUT
Maximum Output Current V
S
= ±15V, R
L
= 1Ω 500 720 mA
I
S
Supply Current per Amplifier V
S
= ±15V, R
BIAS
= 24.9k (Note 6) 10 13 18 mA
● 820mA
V
S
= ±12V, R
BIAS
= 24.9k (Note 6) 8.0 10 13.5 mA
● 6.7 15.0 mA
V
S
= ±12V, R
BIAS
= 32.4k (Note 6) 8 mA
V
S
= ±12V, R
BIAS
= 43.2k (Note 6) 6 mA
V
S
= ±12V, R
BIAS
= 66.5k (Note 6) 4 mA
V
S
= ±5V, R
BIAS
= 24.9k (Note 6) 2.2 3.4 5.0 mA
● 1.8 5.8 mA
Supply Current in Shutdown V
SHDN
= 0.4V 0.1 1 mA
Output Leakage in Shutdown V
SHDN
= 0.4V 0.3 1 mA
Channel Separation V
S
= ±12V, V
OUT
= ±10V, R
L
= 40Ω 80 110 dB
● 77 dB
SR Slew Rate V
S
= ±15V, A
V
= –10, (Note 7) 300 600 V/µs
V
S
= ±5V, A
V
= –10, (Note 7) 100 200 V/µs
HD2 Differential 2nd Harmonic Distortion V
S
= ±12V, A
V
= 10, 2V
P-P
, R
L
= 50Ω, 1MHz –85 dBc
HD3 Differential 3rd Harmonic Distortion V
S
= ±12V, A
V
= 10, 2V
P-P
, R
L
= 50Ω, 1MHz –82 dBc
GBW Gain Bandwidth f = 1MHz 200 MHz
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full specified temperature range, otherwise specifications are at T
A
= 25°C.
V
CM
= 0V, pulse tested, ±5V ≤ V
S
≤ ±15V, V
SHDNREF
= 0V, R
BIAS
= 24.9k between V
+
and SHDN unless otherwise noted. (Note 3)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LT1794IFE#PBF

Mfr. #:
Buy LT1794IFE#PBF
Manufacturer:
Analog Devices Inc.
Description:
High Speed Operational Amplifiers 2x 500mA, 200MHz xDSL Line Drvr Amp
Lifecycle:
New from this manufacturer.
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