cxa1563m Sony Electronics, cxa1563m Datasheet - Page 10

• Manufacturer Part Number: cxa1563m
• Description: Dolby B-c Type Noise Reduction System With Built-in S Type Switch
• Manufacturer: Sony Electronics

Application Note
The CXA1563M/S is a dual channel Dolby B-C type NR IC with a built-in S type (CXA1417S/Q) switch. By
using the CXA1563M/S in conjunction with two sets of the CXA1417S/Q encoder unit, a stereo Dolby B-C-S
type NR system can be achieved.
1) Power Supply
2) Supply Voltage of the CXA1417S/Q and the CXA1563M/S
3) Operation Mode Control
SSW is taken precedence over NRSW, and NRSW is invalid when SSW is at Low.
The CXA1563M/S is designed to operate on either single or dual power supply.
For dual power supply, connect VCT (Pin 28) to GND, and V
For single power supply, connect V
VCT (Pin 28). Connect a by-pass capacitor between this pin and GND.
The operating voltage range is ±3.5 to ±8.0V (7.0 to 16V), which satisfies the signal handling of 12dB
specified by the Dolby Laboratories.
(1) When both have split power supply
(2) When both have single power supply
(3) Single and dual power supplies can not be used together.
The CXA1563M/S has built-in electronic switches. The operations are controlled by the DC voltages of SSW
(Pin 12), NRSW (Pin 13) and MODE (Pin 16) control pins. Table 1 shows the switching truth tables.
For single power supply, VH, VM, and VL correspond to Vcc, Vcc/2 and GND, respectively.
For dual power supply, VH, VM and VL correspond to Vcc, GND and V
Refer to "threshold" on the characteristics graph for the thresholds of the control voltages. NRSW (Pin 13)
and MODE (Pin 16) control pins are connected to VCT via a 50k
condition results. SSW (Pin 12) control pin is of PNP base input, so the pin can be used as VH when it is
open.
SSW
NRSW
MODE
Set within the respective specified ranges.
CXA1417S/Q: ±AV
CXA1563M/S: ±BV
Set at the same potential with the range specified for the CXA1417S/Q (9 to 13V).
CXA1417S/Q: AV
CXA1563M/S: BV
(Encode)
B-C type
MPX ON
C type
REC
VH
Table 1
MPX OFF
(Encode)
B type
REC
VM
—
EE
(Decode)
(Pin 14) to GND. Vcc/2, generated from the internal circuit, is output to
NR OFF
S type
PB
VL
– 10 –
EE
(Pin 14) to the negative power supply.
resistor, so when the pin is open, VM
EE
, respectively.
CXA1563M/S