LT1969CMS#TR Linear Technology, LT1969CMS#TR Datasheet

IC OP-AMP ADJ CURRNT DUAL 10MSOP

LT1969CMS#TR

Manufacturer Part Number
LT1969CMS#TR
Description
IC OP-AMP ADJ CURRNT DUAL 10MSOP
Manufacturer
Linear Technology
Datasheet

Specifications of LT1969CMS#TR

Amplifier Type
General Purpose
Number Of Circuits
2
Slew Rate
200 V/µs
Gain Bandwidth Product
700MHz
Current - Input Bias
1.5µA
Voltage - Input Offset
1000µV
Current - Supply
7mA
Current - Output / Channel
700mA
Voltage - Supply, Single/dual (±)
4 V ~ 13 V, ±2 V ~ 6.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
10-MSOP, Micro10™, 10-uMAX, 10-uSOP
Power Supply Requirement
Dual
Package Type
MSOP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Output Type
-
-3db Bandwidth
-
Lead Free Status / Rohs Status
Not Compliant
Other names
LT1969CMSTR

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
IN
IN
DSL Modems
xDSL PCI Cards
USB Modems
Line Drivers
700MHz Gain Bandwidth
Adjustable Quiescent Current
Low Distortion: –72dBc at 1MHz, 4V
Stable in A
Stable with 1000pF Load
6nV/ Hz Input Noise Voltage
2pA/ Hz Input Noise Current
4mV Maximum Input Offset Voltage
4 A Maximum Input Bias Current
400nA Maximum Input Offset Current
Specified at 6V, 2.5V
+
200mA Minimum I
4.3V Minimum Output Swing, V
4.5V Minimum Input CMR, V
0.1 F
0.1 F
1 F
10k
10k
V
20k
20k
10, Simple Compensation for A
Single 12V Supply ADSL Modem Line Driver
U
1 F
OUT
100
100
+
+
1/2 LT1969
1/2 LT1969
Adjustable Current Operational Amplifier
12V
909
909
S
U
= 6V
S
= 6V, R
12.4
12.4
P-P
, 25 , A
1:2*
CTRL1 CTRL2
L
6
STANDBY
LOW POWER ON
13k
= 25
V
*COILCRAFT X8390-A
OR EQUIVALENT
< 10
V
7
= 2
49.9k
I
I
I
STANDBY ON
Q
Q
Q
ON = 14mA
LOW POWER = 2mA
STANDBY = 600 A
DESCRIPTIO
The LT
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
4 A 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 25 load 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
OUTPUT
LOGIC
, LTC and LT are registered trademarks of Linear Technology Corporation.
1969 TA01a
100
®
1969 is an adjustable current version of the
Dual 700MHz, 200mA,
U
–100
ADSL Modem Line Driver Distortion
–60
–70
–80
–90
0
V
A
f = 200kHz
100 LINE
1:2 TRANSFORMER
S
V
= 12V
= 10
2
4
LINE VOLTAGE (V
6
8
HD2
HD3
10
P-P
LT1969
)
12
1969 TA01b
14
16
1

Related parts for LT1969CMS#TR

LT1969CMS#TR Summary of contents

Page 1

... 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. 12.4 *COILCRAFT X8390-A OR EQUIVALENT 1:2* ...

Page 2

LT1969 ABSOLUTE MAXIMUM (Note 1) + – Total Supply Voltage ( ........................... 13.2V Input Current (Note 2) ....................................... 10mA Input Voltage (Note 2) ............................................ Maximum Continuous Output Current (Note 3) DC ............................................................... 100mA AC ...

Page 3

ELECTRICAL CHARACTERISTICS erature range, otherwise specifications are at T – a 49.9k resistor from CTRL2 pulse power tested unless otherwise noted. (Note 9) SYMBOL PARAMETER I Short-Circuit Current (Sourcing) SC Short-Circuit Current (Sinking) SR Slew Rate Full ...

Page 4

LT1969 ELECTRICAL CHARACTERISTICS erature range, otherwise specifications are at T – and a 49.9k resistor from CTRL2 pulse power tested unless otherwise noted. (Note 9) SYMBOL PARAMETER A Large-Signal Voltage Gain VOL V Output Swing OUT I ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS – 13k resistor from CTRL1 to V and a 49.9k resistor from CTRL2 to V Supply Current vs Temperature 2. ...

Page 6

LT1969 W U TYPICAL PERFOR A CE CHARACTERISTICS – 13k resistor from CTRL1 to V and a 49.9k resistor from CTRL2 to V Gain and Phase vs Frequency PHASE 2.5V S ...

Page 7

W U TYPICAL PERFOR A CE CHARACTERISTICS – 13k resistor from CTRL1 to V and a 49.9k resistor from CTRL2 to V Common Mode Rejection Ratio vs Frequency 100 ...

Page 8

LT1969 W U TYPICAL PERFOR A CE CHARACTERISTICS Harmonic Distortion vs Output Swing 2. – 124 C –20 ...

Page 9

W U TYPICAL PERFOR A CE CHARACTERISTICS Maximum I Sourcing OUT vs Quiescent Current 800 SHORT-CIRCUIT CURRENT 700 600 LINEAR OUTPUT 500 CURRENT REGION 400 300 200 100 ...

Page 10

LT1969 W U TYPICAL PERFOR A CE CHARACTERISTICS Large-Signal Transient, A Low Power** – *13k RESISTOR FROM CTRL1 TO V AND A 49.9k RESISTOR FROM CTRL2 TO V – ** 49.9k RESISTOR FROM CTRL2 CTR1 FLOATING U ...

Page 11

U U APPLICATIO S I FOR ATIO were taken in still air on 3/32" FR-4 board with 2oz copper. This data can be used as a rough guideline in estimating thermal resistance. The thermal resistance for each appli- cation will ...

Page 12

LT1969 U U APPLICATIO S I FOR ATIO Capacitive Loading The LT1969 is stable with a 1000pF capacitive load. The photo of the small-signal response with 1000pF load in a gain of 10 shows 50% overshoot. The photo of the ...

Page 13

U U APPLICATIO S I FOR ATIO network is bootstrapped. This network can also be placed between the inverting input and an AC ground. Another compensation scheme for noninverting circuits is shown in Figure 4. The circuit is unity gain ...

Page 14

LT1969 U U APPLICATIO S I FOR ATIO wasted in the termination resistor. Second, the signal is halved so the gain of the amplifer must be doubled to have the same overall gain to the load. The increase in gain ...

Page 15

U U APPLICATIO S I FOR ATIO and assuming R >> require – 1/ solving – 1 reduce the back-termination by ...

Page 16

LT1969 U U APPLICATIO S I FOR ATIO is also 10, but the power consumption has been reduced to 350mW, a savings of 36% over the previous design. Note that the reduction of the back-termination resistor has allowed use of ...

Page 17

U U APPLICATIO S I FOR ATIO + – CTRL1 6 5 – – V Figure RESISTANCE (k ) ...

Page 18

LT1969 U U APPLICATIO S I FOR ATIO system performance. If left unchecked, the high DC cur- rent can heat the LT1969 to destruction. Using DC blocking capacitors to AC couple the signal to the transformer eliminates the possibility for ...

Page 19

... INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 20

... RMS RMS 3V PEAK, 160mA PEAK COMMENTS Shutdown/Current Set Function 4.6mA Supply Current Set, 80mA I 900V/ s Slew Rate Shutdown/Current Set Function, ADSL CO Driver Gain of 10 Stable, Low Distortion + 100 V L – OUT 1969f LT/TP 0301 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2001 ...

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