LE87251NQCT

LE87251NQCT Datasheet

Le87251 Worldwide ADSL2+ Dual Channel

Part	Datasheet
LE87251NQCT	LE87251NQCT (pdf)

Related Parts	Information
LE87251NQC	LE87251NQC

PDF Datasheet Preview
Le87251 Worldwide ADSL2+ Dual Channel Line Driver BD870 Series Data Sheet • Fixed Voltage Gain Of 13 • 450 mA Peak Output Drive Capability • ±5 V to ±12 V Dual Supplies Or 10 V to 24 V Single Supply • 44 Vp-p Differential Output Into a 100 Ω Load • Vp-p Differential Output Into a 60 Ω Load • Low-power Disable Mode For Each Driver • 4 mA Per Amplifier Quiescent Supply Current • -75 dBc THD With 1 MHz Signal Into a 60 Ω load • 16-pin 4 mm x 4 mm QFN Package • RoHS Compliant Document Number June 2009 129739 Ordering Information Le87251NQC16 pin QFN Green Pkg.Tray Le87251NQCT16 pin QFN Green Pkg.Tape & Reel The green package meets RoHS Directive 2002/95/EC of the European Council to minimize the environmental impact of electrical equipment. ENAB ENCD Logic Control Logic Control VS+ VSGND VINA • Dual Port Full Rate ADSL2+ Line Drivers 7.5k • HDSL Line Drivers The Le87251 is a dual channel differential amplifier designed to drive full rate ADSL2+ signals with very low power dissipation. The Le87251 contains two pairs of wide band amplifiers designed with Zarlink’s HV30 Bipolar SOI process for low power consumption in DSL systems. The amplifiers have an internal fixed gain, which helps to eliminate external feedback and gain setting resistors. The drivers achieve better than -75 dB MTPR while driving a 1 MHz, 16Vp_p signal into a 60 Ω load. The amplifiers are enabled by forcing the ENAB/ENCD pins to ground. Leaving the ENAB/ENCD pins floating or forcing them high will disable the two amplifiers. The ENAB and ENCD pins are pulled up to an internal V through on-chip 50 kΩ resistors. Le87251 device is one of the most cost-effective and high performance line drivers for xDSL2+ applications. VCMAB VINB VINC VCMCD VIND 50k 7.5k 7.5k 50k 50k 7.5k RG RF RG RF Figure 1 - Block Diagram VOUTA VOUTB VOUTC VOUTD Zarlink Semiconductor Inc. Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc. Copyright 2009, Zarlink Semiconductor Inc. All Rights Reserved. Le87251 Data Sheet Table of Contents Pin Diagram 3 Pin Description 3 Applications 5 Typical Application Circuit 5 Component Values for Typical Application 6 Input Considerations 6 Output Driving Considerations 6 Power Supplies and Component Placement 6 Stability. 6 Cable Termination Technique 6 Line Driver Protection 8 Absolute Maximum Ratings 9 Thermal Resistance. 9 Package Assembly 9 Operating Ranges 10 Device Specifications 10 Physical Dimensions 12 16-Pin QFN 12 Zarlink Semiconductor Inc. Pin Diagram Top View Le87251 VOUTA ENAB

PDF Datasheet Preview

Le87251 Worldwide ADSL2+ Dual Channel

Line Driver BD870 Series

Data Sheet
• Fixed Voltage Gain Of 13
• 450 mA Peak Output Drive Capability
• ±5 V to ±12 V Dual Supplies Or 10 V to 24 V

Single Supply
• 44 Vp-p Differential Output Into a 100 Ω Load
• Vp-p Differential Output Into a 60 Ω Load
• Low-power Disable Mode For Each Driver
• 4 mA Per Amplifier Quiescent Supply Current
• -75 dBc THD With 1 MHz Signal Into a 60 Ω load
• 16-pin 4 mm x 4 mm QFN Package
• RoHS Compliant

Document Number

June 2009 129739
Ordering Information

Le87251NQC16 pin QFN Green Pkg.Tray Le87251NQCT16 pin QFN Green Pkg.Tape & Reel

The green package meets RoHS Directive 2002/95/EC of the European Council to minimize the environmental impact of electrical equipment.

ENAB ENCD

Logic Control

Logic Control

VS+ VSGND

VINA
• Dual Port Full Rate ADSL2+ Line Drivers
7.5k
• HDSL Line Drivers

The Le87251 is a dual channel differential amplifier designed to drive full rate ADSL2+ signals with very low power dissipation. The Le87251 contains two pairs of wide band amplifiers designed with Zarlink’s HV30 Bipolar SOI process for low power consumption in DSL systems. The amplifiers have an internal fixed gain, which helps to eliminate external feedback and gain setting resistors.

The drivers achieve better than -75 dB MTPR while driving a 1 MHz, 16Vp_p signal into a 60 Ω load. The amplifiers are enabled by forcing the ENAB/ENCD pins to ground. Leaving the ENAB/ENCD pins floating or forcing them high will disable the two amplifiers. The ENAB and ENCD pins are pulled up to an internal V through on-chip 50 kΩ resistors.

Le87251 device is one of the most cost-effective and high performance line drivers for xDSL2+ applications.

VCMAB VINB VINC

VCMCD VIND
50k 7.5k
7.5k 50k
50k 7.5k

RG RF

RG RF

Figure 1 - Block Diagram

VOUTA

VOUTB VOUTC

VOUTD

Zarlink Semiconductor Inc. Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.

Copyright 2009, Zarlink Semiconductor Inc. All Rights Reserved.

Le87251

Data Sheet

Table of Contents

Pin Diagram 3 Pin Description 3

Applications 5 Typical Application Circuit 5 Component Values for Typical Application 6 Input Considerations 6 Output Driving Considerations 6 Power Supplies and Component Placement 6 Stability. 6 Cable Termination Technique 6 Line Driver Protection 8

Absolute Maximum Ratings 9 Thermal Resistance. 9 Package Assembly 9

Operating Ranges 10 Device Specifications 10

Physical Dimensions 12 16-Pin QFN 12

Zarlink Semiconductor Inc.

Pin Diagram

Top View

Le87251

VOUTA

ENAB

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Datasheet ID: LE87251NQCT 648994