max9890 Maxim Integrated Products, Inc., max9890 Datasheet - Page 9

• Manufacturer Part Number: max9890
• Description: Max9890 Audio Click-pop Suppressor
• Manufacturer: Maxim Integrated Products, Inc.

Figure 7. Low-Frequency Attenuation for Common DC-Blocking
Capacitor Values
The external click-pop suppression capacitor at CEXT
serves a dual purpose. On power-up, C
charged by an internal current source and is used to
slowly ramp up the external coupling capacitors. When
the device is powered down, C
circuitry used to drain the external coupling capacitors.
A 0.1µF capacitor between CEXT and GND provides
clickless/popless operation with coupling capacitors for
both the MAX9890A and MAX9890B, even with the
rapid removal of supply voltage.
Good layout improves performance by decreasing the
amount of stray capacitance and noise. To decrease
stray capacitance, minimize PC board trace lengths
and resistor leads, and place external components as
close to the device as possible.
The excellent PSRR of the MAX9890 allows it to operate
from noisy power supplies. In most applications, a
0.1µF capacitor from V
bypass capacitor should be placed close to V
-12
-15
-18
-21
-24
-27
-30
-3
-6
-9
0
10
Applications Information
_______________________________________________________________________________________
Power Supply and Bypassing
LOW-FREQUENCY ROLLOFF
External Capacitor (C
100
FREQUENCY (Hz)
CC
(R
100µF
33µF
220µF
L
= 16Ω)
1k
to GND is sufficient. This
330µF
CEXT
10k
powers the internal
100k
CC
Layout
CEXT
CEXT
.
Audio Click-Pop Suppressor
is
)
For the latest application details on UCSP construction,
dimensions, tape-carrier information, printed circuit
board techniques, bump-pad layout, and recommend-
ed reflow temperature profile, as well as the latest infor-
mation on reliability testing results, refer to the
Application Note, “UCSP—A Wafer-Level Chip-Scale
Package” available on Maxim’s website at www.maxim-
ic.com/ucsp.
TRANSISTOR COUNT: 1001
PROCESS: BiCMOS
Table 1. Coupling Capacitor
*May experience some degradation of click-pop suppression.
CAPACITOR
SIZE (µF)
100
150
220
330
470
UCSP Applications Information
33
47
TURN-ON TIME
MAX9890A
(200ms)
—
—
√
√
√
*
*
Chip Information
TURN-ON TIME
MAX9890B
(300ms)
√
√
√
√
√
*
*
9