max97236 Maxim Integrated Products, Inc., max97236 Datasheet - Page 36

• Manufacturer Part Number: max97236
• Description: Audio Amplifier With Jack Detection
• Manufacturer: Maxim Integrated Products, Inc.

Audio Amplifier with Jack Detection
The charge pump requires three capacitors: PVDD,
PVSS, and the flying capacitor between C1N and C1P.
It is recommended that these all remain the same value.
36
Table 19. Recommended Component Values
PROCESS: BiCMOS
Charge-pump capacitors
V
Audio input capacitors
Microphone input capacitors
EMI filter capacitors
EMI filter ferrite bead
DD
capacitor
COMPONENT
Component Selection and Layout
Chip Information
Charge-Pump Capacitors
1FF, X5R,
6.3V or greater voltage rating
or better
C1: 1FF to 10FF, X5R, 6.3V
or better
C2: 0.01nF to 0.1FF, X5R,
6.3V minimum
1FF, 6.3V, X5R or better
1FF, 6.3V, X5R or better
33pF
Murata BLM15BB220
RECOMMENDED VALUE
The capacitor needs low ESR to achieve the required charge-
pump output impedance. If the charge-pump output imped-
ance is too high, the headphone amplifier cannot deliver the
stated output power.
A larger capacitor does not completely charge in one switch-
ing cycle. A smaller capacitor does not hold enough charge.
Thus, it is highly recommended to use the suggested value.
C1: A smaller values helps on the ESD robustness.
C2: Is not a must-have capacitor, but still recommended. This
capacitor helps improve the RF immunity of the IC.
Lower capacitance creates a highpass filter due to the input
impedance of the IC.
—
—
—
Capacitance values of 1FF are recommended. Larger
value capacitors can be used to lower power-supply
ripple. Do not use charge-pump caps greater than
3.3FF. See
component value.
Table 19
for a detailed description for each
DETAILS