Le87251
1.0
Pin Diagram
Data Sheet
VCMAB
16
15
14
13
VOUTA
ENAB
Top View
VS+
VINA
VINB
GND
VINC
1
2
12
11
VOUTB
GND
VOUTC
VOUTD
16-pin QFN
3
4
5
EXPOSED PAD
10
9
8
6
7
VIND
Notes:
1. Pin 1 is marked for orientation.
2. The
Le87251
device incorporates an exposed die pad on the underside of its package. The pad acts as a heat sink and must be
connected to a copper plane through thermal vias, for proper heat dissipation.
1.1
Pin Description
Type
Input
Input
Input
Input
Input
Input
Input
Input
Power
Power
Ground
Output
Output
Output
Output
Description
DSL channel #1 enable/disable control pin
DSL channel #2 enable/disable control pin
Amplifier A non-inverting input
Amplifier B non-inverting input
Amplifier C non-inverting input
Amplifier D non-inverting input
Bias voltage for amplifier A and B
Bias voltage for amplifier C and D
Positive power supply
Negative power supply
Ground connection
Amplifier A output
Amplifier B output
Amplifier C output
Amplifier D output
Reference Circuit 2
Reference Circuit 2
Reference Circuit 2
Reference Circuit 2
Note
Reference Circuit 1
Reference Circuit 1
Reference Circuit 2
Reference Circuit 2
Reference Circuit 2
Reference Circuit 2
Pin Name
ENAB
ENCD
VINA
VINB
VINC
VIND
VCMAB
VCMCD
VS+
VS-
GND
VOUTA
VOUTB
VOUTC
VOUTD
Note 1:
Note 2:
Note 3:
Amplifiers A and B comprise DSL channel #1. ENAB allows enable/disable control for DSL channel #1.
Amplifiers C and D comprise DSL channel #2. ENCD allows enable/disable control for DSL channel #2.
Reference circuits 1 and 2 are shown in Figure 2.
VCMCD
ENCD
Zarlink Semiconductor Inc.
VS-
3
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
