UPC1854A View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPC1854A

I2C BUS-COMPATIBLE US MTS PROCESSING LSI

NEC => Renesas Technology 

µPC1854A

(6) Spectral RMS filter

A filter that limits the band width of the signal input to the RMS which controls the variable emphasis. The

transfer function is as follows:

( j f )2

f

j

7.66k

3.92k

T (f) =

×

1 + j f + ( j f )2 1 + j f

7.31k

7.66k

3.92k

(7) Wide-band RMS filter

A filter that limits the band width of the signal input to the wide-band RMS which controls the wide-band VCA.

The transfer function is as follows:

1

T(f) =

f

1+j

2.09k

(8) Spectral RMS

Detects the RMS value of the signal passed through the spectral RMS filter, and converts the signal to the DC

voltage. The release time is set by adjusting the current IT of the µPC1854A and the capacitance of the

external capacitor connected to the STI pin. The current IT is set by the current value output from the ITI pin.

(9) Wide-band RMS

Detects the RMS value of the signal passed through the wide-band RMS filter, and converts the signal to the

DC voltage. The release time is set by adjusting the current IT of the µPC1854A and the capacitance of the

external capacitor connected to the WTI pin. The current IT is set by the current value output from the ITI pin.

2.4 Matrix Block

(1) Matrix

Adds L+R signal and L–R signal to output L signal, and subtracts L+R signal from L–R signal to output R

signal.

(2) Mode selector

Selects the user-selected mode among the monaural, stereo, SAP, external SAP input signals, and mute, then

outputs it from the NOT, ROT and LOT pins.

Data Sheet S12816EJ3V0DS00

17

Share Link: