Datasheet LT1969 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Dual 700MHz, 200mA, Adjustable Current Operational Amplifier |
| Pages / Page | 20 / 1 — FEATURES. DESCRIPTIO. 700MHz Gain Bandwidth. 200mA Minimum IOUT. … |
| File Format / Size | PDF / 297 Kb |
| Document Language | English |
FEATURES. DESCRIPTIO. 700MHz Gain Bandwidth. 200mA Minimum IOUT. Adjustable Quiescent Current
Model Line for this Datasheet
Text Version of Document
LT1969 Dual 700MHz, 200mA, Adjustable Current Operational Amplifier
U FEATURES DESCRIPTIO
■
700MHz Gain Bandwidth
The LT®1969 is an adjustable current version of the ■ ±
200mA Minimum IOUT
popular LT1886, a 200mA minimum output current, dual ■
Adjustable Quiescent Current
op amp with outstanding distortion performance. The ■
Low Distortion: –72dBc at 1MHz, 4VP-P, 25
Ω
, AV = 2
adjustable current feature is highly desirable in applica- ■ Stable in AV ≥ 10, Simple Compensation for AV < 10 tions where minimum power dissipation is required while ■ ±4.3V Minimum Output Swing, VS = ±6V, RL = 25Ω still being able to provide adequate line termination. ■ Stable with 1000pF Load At nominal supply current, the amplifiers are gain of 10 ■ 6nV/√Hz Input Noise Voltage stable and can easily be compensated for lower gains. The ■ 2pA/√Hz Input Noise Current LT1969 features balanced high impedance inputs with ■ 4mV Maximum Input Offset Voltage 4µA input bias current and 4mV maximum input offset ■ 4µA Maximum Input Bias Current voltage. Single supply applications are easy to implement ■ 400nA Maximum Input Offset Current and have lower total noise than current feedback amplifier ■ ±4.5V Minimum Input CMR, VS = ±6V implementations. ■ Specified at ±6V, ±2.5V The output drives a 25Ω load to ±4.3V with ±6V supplies.
U
On ±2.5V supplies, the output swings ±1.5V with a 100Ω
APPLICATIO S
load. The amplifier is stable with a 1000pF capacitive load ■ making it useful in buffer and cable driver applications. DSL Modems ■ xDSL PCI Cards The LT1969 is manufactured on Linear Technology’s ■ USB Modems advanced low voltage complementary bipolar process and ■ Line Drivers is available in a thermally enhanced MS10 package , LTC and LT are registered trademarks of Linear Technology Corporation.
U TYPICAL APPLICATIO Single 12V Supply ADSL Modem Line Driver
12V
ADSL Modem Line Driver Distortion
0.1µF –60 IN + + V 12.4Ω S = 12V 1/2 LT1969 AV = 10 f = 200kHz – –70 100Ω LINE 1:2 TRANSFORMER 909Ω *COILCRAFT X8390-A 10k 20k 1:2* OR EQUIVALENT HD2 100Ω –80 100Ω 1µF 10k 20k 1µF 100Ω –90 909Ω HARMONIC DISTORTION (dBc) HD3 I CTRL1 CTRL2 Q ON = 14mA – IQ LOW POWER = 2mA 6 7 I 12.4Ω Q STANDBY = 600µA –100 0 2 4 6 8 10 12 14 16 0.1µF 1/2 LT1969 13k 49.9k STANDBY ON + LINE VOLTAGE (VP-P) IN – LOGIC 1969 TA01b OUTPUT STANDBY 1969 TA01a LOW POWER ON 1
U FEATURES DESCRIPTIO
■
700MHz Gain Bandwidth
The LT®1969 is an adjustable current version of the ■ ±
200mA Minimum IOUT
popular LT1886, a 200mA minimum output current, dual ■
Adjustable Quiescent Current
op amp with outstanding distortion performance. The ■
Low Distortion: –72dBc at 1MHz, 4VP-P, 25
Ω
, AV = 2
adjustable current feature is highly desirable in applica- ■ Stable in AV ≥ 10, Simple Compensation for AV < 10 tions where minimum power dissipation is required while ■ ±4.3V Minimum Output Swing, VS = ±6V, RL = 25Ω still being able to provide adequate line termination. ■ Stable with 1000pF Load At nominal supply current, the amplifiers are gain of 10 ■ 6nV/√Hz Input Noise Voltage stable and can easily be compensated for lower gains. The ■ 2pA/√Hz Input Noise Current LT1969 features balanced high impedance inputs with ■ 4mV Maximum Input Offset Voltage 4µA input bias current and 4mV maximum input offset ■ 4µA Maximum Input Bias Current voltage. Single supply applications are easy to implement ■ 400nA Maximum Input Offset Current and have lower total noise than current feedback amplifier ■ ±4.5V Minimum Input CMR, VS = ±6V implementations. ■ Specified at ±6V, ±2.5V The output drives a 25Ω load to ±4.3V with ±6V supplies.
U
On ±2.5V supplies, the output swings ±1.5V with a 100Ω
APPLICATIO S
load. The amplifier is stable with a 1000pF capacitive load ■ making it useful in buffer and cable driver applications. DSL Modems ■ xDSL PCI Cards The LT1969 is manufactured on Linear Technology’s ■ USB Modems advanced low voltage complementary bipolar process and ■ Line Drivers is available in a thermally enhanced MS10 package , LTC and LT are registered trademarks of Linear Technology Corporation.
U TYPICAL APPLICATIO Single 12V Supply ADSL Modem Line Driver
12V
ADSL Modem Line Driver Distortion
0.1µF –60 IN + + V 12.4Ω S = 12V 1/2 LT1969 AV = 10 f = 200kHz – –70 100Ω LINE 1:2 TRANSFORMER 909Ω *COILCRAFT X8390-A 10k 20k 1:2* OR EQUIVALENT HD2 100Ω –80 100Ω 1µF 10k 20k 1µF 100Ω –90 909Ω HARMONIC DISTORTION (dBc) HD3 I CTRL1 CTRL2 Q ON = 14mA – IQ LOW POWER = 2mA 6 7 I 12.4Ω Q STANDBY = 600µA –100 0 2 4 6 8 10 12 14 16 0.1µF 1/2 LT1969 13k 49.9k STANDBY ON + LINE VOLTAGE (VP-P) IN – LOGIC 1969 TA01b OUTPUT STANDBY 1969 TA01a LOW POWER ON 1
