DS4420 Maxim, DS4420 Datasheet - Page 10

• Manufacturer Part Number: DS4420
• Description: The DS4420 is a fully differential, programmable gain amplifier for audio applications
• Manufacturer: Maxim

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© 2006 Maxim Integrated Products
I
for Audio Applications
The DS4420 exposed paddle is not electrically isolated.
It must be soldered to ground for proper operation.
The DS4420 is designed to be operated with an AC-
coupled input signal. The input resistance, R
ciently large to allow the use of small and inexpensive
external capacitors. The input resistance combined
with the AC-coupling capacitor will create a highpass
filter. The -3dB cutoff frequency of the highpass, f
given by:
where C
the internal input resistance.
At the cutoff frequency, the input signal will be attenuat-
ed 3dB, with less attenuation as the signal’s frequency
increases beyond the cutoff frequency. To guarantee
passband flatness, the cutoff frequency of the filter
should be designed using the specified minimum input
resistance, and placed well below the desired flat band
of the circuit. The typical input resistance should only
be used to estimate typical performance.
Springer
2
C Programmable-Gain Amplifier
IN
is a registered trademark of Dallas Semiconductor Corporation.
is the external coupling capacitor and R
f
C
=
Input-Coupling Capacitors
2
π
×
C
IN
1
×
R
IN
Exposed Paddle
IN
, is suffi-
C
IN
, is
is
The DS4420’s ground pins, GND and AGND, must be
connected together externally. Internally, they are con-
nected as shown in Figure 5.
TRANSISTOR COUNT: 5347
SUBSTRATE CONNECTED TO: Ground
For the latest package outline information, go to
ic.com/DallasPackInfo.
Figure 5. Internal Ground Connections
is a registered trademark of Maxim Integrated Products, Inc.
Internal Ground Connections
GND
Package Information
TYPICAL
13Ω
AGND
Chip Topology
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