CXA1550P, CXA1551M/P, CXA1552M/P, CXA1553M/P
Notes on Applications
1) Power supply
The CXA1550 series is designed to operate on either single or split power supply. The ripple rejection
performance is excellent for either supply. VCT (Pin 4) is a reference voltage of the VCC/2 buffer amplifier.
With single power supply operation, internally generated VCC/2 voltage appears at the pin, and a bypass
capacitor has to be connected between the pin and ground. On split power supply operation, the VCT (Pin
4) pin has to be connected to ground, and VEE (negative power supply) is supplied to the GND (Pin 15) pin.
2) Double speed (×2)
The CXA1550 series provides double speed encode/decode modes, which offer high speed dubbing
function. On double speed mode, the frequency response shifts twice as the normal B type.
3) Operational mode control
The CXA1550 series provides fully electronic switching circuits. The functions are controlled by DC voltage
of the two control pins of REC/PB (Pin 12) and ON/OFF/×2 (Pin 5). The switching truth tables are shown in
Table 1.
Pin
Function
PB (Decode)
REC (Encode)
NR × 2
Single Supply
VCC ≥ V ≥ 2.5 V
Split Supply
VCC ≥ V ≥ VEE+2.5 V
Pin 12
0.5 V ≥ V ≥ 0 V
VEE+0.5 V ≥ V ≥ VEE
VCC ≥ V ≥ VCC–0.5 V
VCC–2.5 ≥ V ≥ 2.5 V
0.5 V ≥ V ≥ 0 V
VCC ≥ V ≥ VCC–0.5 V
VCC–2.5 V ≥ V ≥ VEE+2.5 V
VEE+0.5 V ≥ V ≥ VEE
Pin 5 NR OFF
NR ON
Table 1.
It is desirable to provide CR time constant circuits at the mode control pins with time constant from 100
msec to 1 sec, which will reduce switching clicks effectively.
4) Reference levels
Characteristics and specifications of the Dolby noise reduction processor are defined as the levels and
measured with reference to the Dolby level. This particular level in these devices is –10 dBm (245 mVrms),
and is measured at the recording output (REC OUT) in the NR off mode.
The reference levels of the recording input (REC IN), playback input (PB IN) and line output (LINE OUT)
are defined as the levels which provide the Dolby level at the recording output in the NR off mode.
The CXA1550 series has a common silicon die, and has different internal connection (AL pattern). The
series provides four different line output levels for various applications. Other reference levels, recording
input level, playback input level and recording output level (=Dolby level) are identical in all devices.
The reference levels are as follows
Recording output level (=Dolby level)
Recording input level
–10 dBm (245 mVrms)
–30 dBm (24.5 mVrms)
–30 dBm (24.5 mVrms)
0 dBm (775 mVrms)
–3 dBm (548 mVrms)
–6 dBm (388 mVrms)
–10 dBm (245 mVrms)
Playback input level
Line output level
CXA1550
CXA1551
CXA1552
CXA1553
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