CXA1878Q
1. Reference levels
(1) Recording equalizer amplifier output level (315Hz, –3dBv)
[ when the recording equalizer amplifier input level is –24dBv]
(2) Playback equalizer amplifier output level (315Hz, –11dBv)
[ when the playback equalizer amplifier input level is –31dBv]
(3) Dolby
The Dolby level is measured at the recording output pin (REC OUT) at –6dBm (388mVrms) in the NR OFF
mode. Reference levels for the recording input pin (LINE IN), playback input pin (PB IN) and line output
pin (LINE OUT) are defined as the levels which apply the Dolby level to REC OUT in the NR OFF mode.
2. System control methods
(1) Mode settings table
Pin voltage
Remarks
3-state
Pin No.
34
Symbol
Low
Medium
High
DOLBY NR ON
B type
DOLBY NR ON
C type
NR SW
DOLBY NR OFF
35
16
20
19
25
23
NR S SW
AMS SW
MODE SW
SPEED
DOLBY S
AMS OFF
DOLBY B-C
CALIBRATION
BS MODE
3-state
3-state
2-state
2-state
2-state
2-state
AMS MODE
PB
—
REC
NORMAL SPEED
PB IN A
—
HIGH SPEED
PB IN B
DECK A/B
A EQ
—
PB IN A EQ FLAT
PB IN B EQ FLAT
REC EQ NORMAL
—
PB IN A EQ 70µ
PB IN B EQ 70µ
REC EQ METAL
PB IN B EQ 70µ
REC EQ CrO2
24
B EQ
3-state
BIAS SW
NORMAL
BIAS SW
CrO2
BIAS SW
METAL
17
18
PASS SW
DOLBY NR
METER ON
MUTE
—
PASS
3-state
2-state
METER SW
METER OFF
Note: When 3-state input pins are open, the pin voltage is medium.
The NR SW (Pin 34) operates only when the NR S SW (Pin 35) is set to medium.
(2) Mode setting pin control voltage
Control voltage
High level
Min.
4.2
2.2
0.0
3.5
0.0
Max.
VCC
2.8
3-state
2-state
Medium level
Low level
0.5
High level
VCC
0.5
Low level
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SONY [ SONY CORPORATION ]
