CXA2570 Ver la hoja de datos (PDF) - Sony Semiconductor

Número de pieza

componentes Descripción

Fabricante

CXA2570

RF Matrix Amplifier

Sony Semiconductor 

CXA2570N

Description of Functions

• RFAC

The RF signal input by connecting capacitance to the EQ_IN pin is equalized, arithmetically amplified and then

output from the RFAC pin.

A6

B7

C8

D9

AC_SUM

4

AC

SUM

VCC

BST VFC

5.1k 0.1

19 20 21 RFC

RF

3

EQ_IN

RFG 18

RW/ROM

Low-frequency gain

AC_SUM: 16dB (both ROM/RW)

VCA to RFAC ROM: 2dB

RW: 14dB

EQ

Amp

When BST = VCC

13 RFAC

The EQ can be bypassed by connecting the BST control pin (Pin 19) to VCC. In this case only the EQ block

enters sleep mode and the low power consumption mode (slim mode) is activated. The low-frequency gain is

the same value as for EQ ON mode.

The RF_SUM input dynamic range is VC ± 300mV (typ.).

If RF (summing signal) is present at the pickup output pin, input the addition output signal to the EQ_IN pin

(Pin 3) coupled by capacitance.

When using a pickup without a summing output function, perform addition with the AC SUM block and then

input the signal to the EQ_IN pin coupled by capacitance.

RW/ROM switching is done by the VCA block, so either input method can be used without problem.

The RW gain is 12dB higher than the ROM gain.

The VCA low-frequency gain can be adjusted by

the RFG pin (Pin 18) voltage.

The control voltage vs. low-frequency gain

characteristics are shown in the graph to the right.

Gain [dB]

8

0

–8

VCA variable range

VC – 1

VC

The RFAC pin (Pin 13) is an NPN transistor emitter follower output.

The maximum drive current is approximately 2mA.

If the load capacitance distorts the output waveform, increase the drive current.

Connect resistance between Pin 13 and GND.

– 11 –

VC + 1

Vcut [V]

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