CS43L36 datasheet(11/89 Pages) CIRRUS

11 / 89 page

DS1081F3

CS43L36

2.1 Electromagnetic Compatibility (EMC) Circuitry

The circuit in Fig. 2-2 may be applied to signals not local to the CS43L36 (i.e., that traverse significant distances) for EMC.

Figure 2-2. Optional EMC Circuit

2.1.1

Low-Profile Charge-Pump Capacitors

In the typical connection for analog mics (Fig. 2-1), the recommended capacitor values for the charge-pump circuitry are

2.2 µF, rated as X7R/X5R or better. The following low-profile versions of these capacitors are suitable for the application:

• Description: 2.2 µF ±20%, 6.3 V, X5R, 0201

• Manufacturer, Part Number: Murata, GRM033R60J225ME47, nominal height = 0.3 mm

• Manufacturer, Part Number: AVX, 02016D225MAT2A, nominal height = 0.33 mm

Note: Although the 0201 capacitors described are suitable, larger capacitors such as 0402 or larger may provide

acceptable performance.

2.1.2

Ceramic Capacitor Derating

Note 4 in Fig. 2-1 highlights that ceramic capacitor derating factors can significantly affect in-circuit capacitance values

and, in turn, CS43L36 performance. Under typical conditions, numerous types and brands of large-value ceramic

capacitors in small packages exhibit effective capacitances well below their ±20% tolerance, with some being derated by

as much as –50%. These same capacitors, when tested by a multimeter, read much closer to their rated value. A similar

derating effect has not been observed with tantalum capacitors.

The derating observed varied with manufacturer and physical size: Larger capacitors performed better, as did ones from

Kemet Electronics Corp. and TDK Corp. of any size. This derating effect is described in data sheets and in applications

notes from capacitor manufacturers. For instance, as DC and AC voltages are varied from the standard test points (applied

DC and AC voltages for standard test points versus PSRR test are 0 and 1 VRMS @ 1 kHz versus 0.9 V and ~1 mVRMS

@ 20 Hz–20 kHz), it is documented that the capacitances vary significantly.

To/from

other

circuits

To/from DUT

27 pF

X7R

L1 and L2: Ferrite:

fTransition = 30–100 MHz

DCR = 0.09–0.30



D1: Transorb:

VBreakdown > Normal operating peak

voltage of signal

Notes:

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