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Linear Technology Electronic Components Datasheet

LT1969 Datasheet

Adjustable Current Operational Amplifier

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LT1969
Dual 700MHz, 200mA,
Adjustable Current Operational Amplifier
FEATURES
s 700MHz Gain Bandwidth
s ±200mA Minimum IOUT
s Adjustable Quiescent Current
s Low Distortion: –72dBc at 1MHz, 4VP-P, 25, AV = 2
s Stable in AV 10, Simple Compensation for AV < 10
s ±4.3V Minimum Output Swing, VS = ±6V, RL = 25
s Stable with 1000pF Load
s 6nV/Hz Input Noise Voltage
s 2pA/Hz Input Noise Current
s 4mV Maximum Input Offset Voltage
s 4µA Maximum Input Bias Current
s 400nA Maximum Input Offset Current
s ±4.5V Minimum Input CMR, VS = ±6V
s Specified at ±6V, ±2.5V
U
APPLICATIO S
s DSL Modems
s xDSL PCI Cards
s USB Modems
s Line Drivers
DESCRIPTIO
The LT®1969 is an adjustable current version of the
popular LT1886, a 200mA minimum output current, dual
op amp with outstanding distortion performance. The
adjustable current feature is highly desirable in applica-
tions where minimum power dissipation is required while
still being able to provide adequate line termination.
At nominal supply current, the amplifiers are gain of 10
stable and can easily be compensated for lower gains. The
LT1969 features balanced high impedance inputs with
4µA input bias current and 4mV maximum input offset
voltage. Single supply applications are easy to implement
and have lower total noise than current feedback amplifier
implementations.
The output drives a 25load to ±4.3V with ±6V supplies.
On ±2.5V supplies, the output swings ±1.5V with a 100
load. The amplifier is stable with a 1000pF capacitive load
making it useful in buffer and cable driver applications.
The LT1969 is manufactured on Linear Technology’s
advanced low voltage complementary bipolar process and
is available in a thermally enhanced MS10 package
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Single 12V Supply ADSL Modem Line Driver
12V
0.1µF
IN +
10k 20k
+
1/2 LT1969
909
12.4
100
1:2*
*COILCRAFT X8390-A
OR EQUIVALENT
1µF 10k 20k
0.1µF
IN
1µF 100
909
1/2 LT1969
+
12.4
100
CTRL1 CTRL2
67
IQ ON = 14mA
IQ LOW POWER = 2mA
IQ STANDBY = 600µA
13k 49.9k STANDBY ON
STANDBY
LOW POWER ON
LOGIC
OUTPUT
1969 TA01a
ADSL Modem Line Driver Distortion
–60
VS = 12V
AV = 10
f = 200kHz
–70 100LINE
1:2 TRANSFORMER
HD2
–80
–90
HD3
–100
0 2 4 6 8 10 12 14 16
LINE VOLTAGE (VP-P)
1969 TA01b
1


Linear Technology Electronic Components Datasheet

LT1969 Datasheet

Adjustable Current Operational Amplifier

No Preview Available !

LT1969
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage (V+ to V) ........................... 13.2V
Input Current (Note 2) ....................................... ±10mA
Input Voltage (Note 2) ............................................ ±VS
Maximum Continuous Output Current (Note 3)
DC ............................................................... ±100mA
AC ............................................................... ±300mA
Operating Temperature Range (Note 10) – 40°C to 85°C
Specified Temperature Range (Note 9) .. – 40°C to 85°C
Maximum Junction Temperature ......................... 150°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
V+ 1
OUTA 2
–INA 3
+INA 4
V5
TOP VIEW
10 OUTB
9 –INB
8 +INB
7 CTRL2
6 CTRL1
MS10 PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 110°C/W (NOTE 4)
ORDER PART
NUMBER
LT1969CMS
MS10 PART MARKING
LTTN
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating temp-
erature range, otherwise specifications are at TA = 25°C. VS = ±6V, VCM = 0V, nominal mode with a 13k resistor from CTRL1 to V and
a 49.9k resistor from CTRL2 to V , pulse power tested unless otherwise noted. (Note 9)
SYMBOL PARAMETER
VOS Input Offset Voltage
Input Offset Voltage Drift
IOS Input Offset Current
IB Input Bias Current
en Input Noise Voltage
in Input Noise Current
RIN Input Resistance
CIN
CMRR
PSRR
Input Capacitance
Input Voltage Range (Positive)
Input Voltage Range (Negative)
Common Mode Rejection Ratio
Minimum Supply Voltage
Power Supply Rejection Ratio
CONDITIONS
(Note 5)
(Note 8)
f = 10kHz
f = 10kHz
VCM = ±4.5V
Differential
VCM = ±4.5V
Guaranteed by PSRR
VS = ±2V to ±6.5V
MIN TYP MAX
UNITS
14
mV
q 5 mV
q 3 17 µV/°C
150 400
nA
q 600 nA
1.5 4
µA
q 6 µA
6 nV/Hz
2 pA/Hz
5 10
35
M
k
2 pF
q 4.5
5.9
q – 5.2 – 4.5
V
V
q 77
98
dB
q ±2 V
80
q 78
86
dB
dB
AVOL Large-Signal Voltage Gain
VOUT = ±4V, RL = 100
5.0
q 4.5
12
V/mV
V/mV
VOUT
Output Swing
VOUT = ±4V, RL = 25
RL = 100, 10mV Overdrive
RL = 25, 10mV Overdrive
IOUT = 200mA, 10mV Overdrive
4.5
q 4.0
4.85
q 4.70
4.30
q 4.10
4.30
q 4.10
12
5
4.6
4.5
V/mV
V/mV
±V
±V
±V
±V
±V
±V
2


Part Number LT1969
Description Adjustable Current Operational Amplifier
Maker Linear
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LT1969 Datasheet PDF





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