CXA2570 Sony Corporation, CXA2570 Datasheet - Page 11

• Manufacturer Part Number: CXA2570
• Description: RF Matrix Amplifier
• Manufacturer: Sony Corporation

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.
The EQ can be bypassed by connecting the BST control pin (Pin 19) to V
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.
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.
RF
AC_SUM
EQ_IN
Low-frequency gain
AC_SUM: 16dB (both ROM/RW)
RFG
VCA to RFAC
A
B
C
D
18
6
7
8
9
4
3
ROM: 2dB
RW: 14dB
RW/ROM
AC
SUM
BST
19
– 11 –
VFC
EQ
20
When BST = V
–8
Gain [dB]
8
0
V
21
CC
5.1k
RFC
VC – 1
CC
0.1
VCA variable range
Amp
CC
. In this case only the EQ block
VC
VC + 1
13
RFAC
Vcut [V]
CXA2570N