le87220 Zarlink Semiconductor, le87220 Datasheet - Page 4

• Manufacturer Part Number: le87220
• Description: Worldwide Xdsl Dual Channel Line Driver
• Manufacturer: Zarlink Semiconductor

CONNECTION DIAGRAM
Notes:
1.
2.
PIN DESCRIPTIONS
Pin 1 is marked for orientation.
The
to a copper plane through thermal vias, for proper heat dissipation
Le87220
Pdown
DDWNP
DDWNP
DISCON
AY
AY
VBAT
VCC
AGND
BGND
N/C
EXPOSED PAD
1
2
, BY
, BY
device incorporates an exposed die pad on the underside of its package. The pad acts as a heat sink and must be connected
1
, Pdown
1
2
1
2
1
Pin
, DDWNN
, DDWNN
, DISCON
2
1
2
2
,
Top View
DDWNN
DDWNP
Control Bits
Differential Downstream
A/B Line Driver
Negative Battery
Power Supply
Analog Ground
Battery Ground
No Connect
Disconnect
N/C
N/C
N/C
N/C
Pin Name
1
1
1
2
3
4
5
6
24
7
Zarlink Semiconductor Inc.
23
8
Le87220JQC
EXPOSED PAD
24-pin QFN
22
9
21
10
Isolated
Ground
Ground
Output
Power
Power
Type
Input
Input
Input
4
(See PCB Layout, on page
20
11
19
12
17
15
13
18
16
14
Active/Pdown mode control bit.
The differential downstream signal from the data AFE is AC
coupled to these pins.
Disables the line completely by pulling it to VCC.
Differential downstream line driver outputs.
Negative power supply.
+3.3 V analog power supply.
Low voltage ground return.
Battery ground return.
Not connected.
Exposed pad on underside of device must be connected to
a heat spreading area. The AGND plane is recommended.
AY
N/C
N/C
N/C
DDWNN
DDWNP
2
2
2
8.).
Description