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| LM4961_14 Datasheet, PDF (2/23 Pages) Texas Instruments – Ceramic Speaker Driver | |||
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LM4961, LM4961LQBD
SNAS242J â AUGUST 2004 â REVISED MARCH 2007
Typical Application
VDD
L1
D1
CS1
4.7 PF
Shutdown 1
10 PH
CF
4
11 470 pF
R2
68k
VDD
SW
7
GND
8
FB
12
R3
GND
13k
6
Shutdown 1
VI = VFB(1 + R2/(R3 + 170))**
4.7 PF
CO
Band-SW
Shutdown 2
CBYPASS
1.0 PF
19
Band-SW
3
Shutdown 2
2
Bypass
1
SW-Out
28
SW GND
26
VI
24
GND
CS2
4.7 PF
*Rc
1k 17
Cchg
27
VO2
15
Ceramic
Audio In
0.1 PF
Ci
20k 18
VIN
Ri
BW1 BW2
20
21
23
15
VO1
2 PF
Load
RF1
20k
RF2
200k
www.ti.com
82 pF
CF1
* RC is needed for over/under voltage protection. If inputs are less than VDD +0.3V and greater than â0.3V, and if
inputs are disabled when in shutdown mode, then RC can be shorted.
** VFB = 1.23V
Figure 2. Typical Audio Amplifier Application Circuit
Receiver Mode (BW2)
Ringer Mode (BW1)
Shutdown
Shutdown 1
â
high
low
Shutdown 2
high
high
low
Band-SW
low
high
low
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
2
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Copyright © 2004â2007, Texas Instruments Incorporated
Product Folder Links: LM4961 LM4961LQBD
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