LT1739CUE#PBF Linear Technology, LT1739CUE#PBF Datasheet

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LT1739CUE#PBF

Manufacturer Part Number
LT1739CUE#PBF
Description
Manufacturer
Linear Technology
Datasheet

Specifications of LT1739CUE#PBF

Power Supply Requirement
Dual
Slew Rate
200V/us
Pin Count
12
Lead Free Status / RoHS Status
Compliant

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Manufacturer
Quantity
Price
Company:
Part Number:
LT1739CUE#PBFLT1739CUE
Manufacturer:
LT
Quantity:
10 000
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Part Number:
LT1739CUE#PBF
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LINEAR/凌特
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20 000
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LT1739CUE#PBFLT1739CUE#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
1000pF
3mm 4mm High Power DFN Package
Exceeds All Requirements For Full Rate,
Downstream ADSL Line Drivers
Low Distortion: – 82dBc at 1MHz, 2V
Power Saving Adjustable Supply Current
Power Enhanced TSSOP-20 Small Footprint Package
200MHz Gain Bandwidth
600V/ s Slew Rate
Specified at 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
10.9V Output Swing, V
500mA Minimum I
11.1V Output Swing, V
+IN
–IN
High Efficiency 12V Supply ADSL Central Office Line Driver
110
110
+
+
LT1739
LT1739
U
1/2
1/2
1k
1k
–12V
12V
OUT
SHDN
SHDNREF
S
R
24.9k
S
BIAS
= 12V, I
= 12V, R
12.7
12.7
U
1:2*
L
L
P-P
= 250mA
*COILCRAFT X8390-A OR EQUIVALENT
I
WITH R
SUPPLY
= 100
Into 50
BIAS
= 10mA PER AMPLIFIER
= 24.9k
1739 TA01
DESCRIPTIO
The LT
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 LT1739 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 100
supplies, and 10.9V with a 250mA load. The LT1739 is a
pin-for-pin replacement for the LT1794 in xDSL line driver
applications and requires no circuit changes.
The LT1739 is available in the very small, thermally
enhanced, 3mm 4mm DFN package or a 20-lead TSSOP
for maximum port density in central office line driver
applications. For a dual version of the LT1739, see the
LT6301 data sheet.
, LTC and LT are registered trademarks of Linear Technology Corporation.
100
®
1739 is a 500mA minimum output current, dual op
xDSL Line Driver Amplifier
0 . 8
Dual 500mA, 200MHz
m m
U
THERMAL
EXPOSED
PAD
3mm 4mm DFN Package
3 m
m
load to 11.1V with 12V
Bottom View
LT1739
4 m
m
1739fas, sn1739
1 7 3
9 T
1
A 0
2

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LT1739CUE#PBF Summary of contents

Page 1

... DFN package or a 20-lead TSSOP for maximum port density in central office line driver applications. For a dual version of the LT1739, see the LT6301 data sheet. , LTC and LT are registered trademarks of Linear Technology Corporation. 1:2* 100 1739 TA01 *COILCRAFT X8390-A OR EQUIVALENT ...

Page 2

LT1739 ABSOLUTE MAXIMUM + – Supply Voltage ( ................................. 13.5V Input Current ..................................................... 10mA Output Short-Circuit Duration (Note 2) ........... Indefinite Operating Temperature Range ............... – Specified Temperature Range ...

Page 3

ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full specified temperature range, otherwise specifications are 0V, pulse tested 12V SYMBOL PARAMETER R Input Resistance IN C Input Capacitance IN ...

Page 4

LT1739 W U TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Ambient Temperature 12V 24.9k TO SHDN BIAS SHDNREF –50 –30 ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS CMRR vs Frequency 100 12V 10mA PER AMPLIFIER 0 100 ...

Page 6

LT1739 W U TYPICAL PERFOR A CE CHARACTERISTICS Differential Harmonic Distortion vs Supply Current –40 –45 –50 – 1MHz, HD3 –60 – 100kHz, HD2 –70 – 100kHz, HD3 – 1MHz, HD2 –85 ...

Page 7

U U APPLICATIO S I FOR ATIO The LT1739 is a high speed, 200MHz gain bandwidth product, dual voltage feedback amplifier with high output current drive capability, 500mA source and sink. The LT1739 is ideal for use as a line ...

Page 8

... F04 Figure 4. Providing Logic Input Control of Operating Current Linear Technology for assistance in implementing a single supply design with operating current control. These modes can be useful for overall system power manage- ment when full power transmissions are not necessary. Shutdown and Recovery ...

Page 9

U U APPLICATIO S I FOR ATIO the design of the PCB and card enclosure to take measures to spread the heat developed in the driver away to the ambient environment to prevent thermal shutdown (which occurs when the junction ...

Page 10

LT1739 U U APPLICATIO S I FOR ATIO –240 –200 –160 –120 –80 – (mA) LOAD Figure LOAD At full power to the line the driver ...

Page 11

U U APPLICATIO S I FOR ATIO When PCB cards containing multiple ports are inserted into a rack in an enclosed cabinet often necessary to provide airflow through the cabinet and over the cards. As STILL AIR PACKAGE ...

Page 12

LT1739 U U APPLICATIO S I FOR ATIO Layout and Passive Components With a gain bandwidth product of 200MHz the LT1739 requires attention to detail in order to extract maximum performance. Use a ground plane, short lead lengths and a ...

Page 13

U U APPLICATIO S I FOR ATIO In differential driver applications, as shown on the first page of this data sheet recommended that the gain setting resistor be comprised of two equal value resistors connected to a good ...

Page 14

LT1739 U U APPLICATIO S I FOR ATIO + – – –V 1739 F15 A + –V I Figure 15. ...

Page 15

U U APPLICATIO S I FOR ATIO Using DC blocking capacitors, as shown in Figure 16 couple the signal to the transformer eliminates the possibility for DC current to flow under any conditions. These capacitors should be sized ...

Page 16

LT1739 U U APPLICATIO S I FOR ATIO C1 0 DRV (+) R2 R23 3 10k OPT C9 0 C15 OPT R21 10k 3 R24 R22 107 2 R5 10k OPT ...

Page 17

PLIFIED SCHE ATIC + V –IN – V (one amplifier shown) Q9 Q10 Q12 Q11 LT1739 Q13 Q17 C1 Q14 +IN OUT Q15 C2 Q18 Q16 1739 SS ...

Page 18

LT1739 PACKAGE DESCRIPTIO 6.60 0.10 4.50 0.10 SEE NOTE 4 RECOMMENDED SOLDER PAD LAYOUT 4.30 – 4.50* (.169 – .177) 0.45 – 0.75 0.09 – 0.20 (.018 – .030) (.0036 – .0079) NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS 2. DIMENSIONS ARE ...

Page 19

... MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 4. EXPOSED PAD SHALL BE SOLDER PLATED 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. U ...

Page 20

... Low Noise, Low Power Differential Receiver, 4mA/Amplifier 12V Operation, 7mA/Amplifier, ADSL Modem Line Driver 12V Operation, MSOP Package, ADSL Modem Line Driver ADSL CO Driver in SSOP Package 100 LINE 1739 F17 , 1739fas, sn1739 LT/TP 0602 1.5K REV A • PRINTED IN THE USA LINEAR TECHNOLOGY CORPORATION 2001 ...

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