The CXA2559Q is an IC designed for use in car
stereo cassette decks. Functions include playback
equalizer amplifier and music sensor into a single
chip.
Features
• Few external parts
• Small package (40-pin QFP)
• Same pin configuration as for the Dolby B-C type
NR system (CXA2561Q) and Dolby B type NR
system (CXA2560Q)
• Playback equalizer amplifier and music sensor into
a single chip
• FORWARD/REVERSE head select switch
• Mute function
• Music signal interval detection level can be set by
the external resistors/capacitors (2 modes).
• High-frequency cut-off of the music sensor circuit
can be adjusted by the external capacitance.
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings
• Supply voltageVCC12V
• Operating temperature Topr–40 to +85°C
• Storage temperatureTstg–65 to +150°C
• Power dissipationPD430mW
Operating Condition
Supply voltageVCC6.5 to 11V
40 pin QFP (Plastic)
Applications
• Car stereo cassette decks
• Playback-only cassette decks
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for
any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
– 11 –
Page 12
Description of Operation
1. Signal route
The CXA2559Q signal circuit is shown in Fig. 1.
CXA2559Q
PB IN
FWD
RVS
PBFB
AMP1
300k
PBTC
MUTE OFF
7k/12k
MUTE OFF
100k
PBOUT LINEOUT
TAPEIN
(–30dBm)
24dB
MUTE ON
AMP2
MUTE ON
VGS
VGS
(–6dBm line amplifier
reference output level)
Fig. 1. Signal route block diagram
2. Gain adjustment method
Adjust the playback equalizer amplifier gain so that –6dBm is output on LINEOUT (Pins 7 and 24) by playing
back the reference tape for Dolby level adjustment.
By this adjustment, the output can be the same level as for the CXA2560Q and CXA2561Q which have the
built-in Dolby NR system.
Dolby level is defined as 200nWb/m measured according to the ANSI high efficiency head method.
Use the following reference tapes specified by Dolby Laboratories Licensing Corporation.
0
–10
–20
–30
–40
–50
–60
–70
–80
(dBm)
PBOUT
VR adjustment
400Hz 200nWb/m: Dolby level reference tape
PBIN (HEAD)
–30dBm
TAPEIN
Fig. 2. Level diagram
–6dBm
(Dolby level)
LINEOUT
– 12 –
List of Calibration Cassette Tape
1. A-bex Laboratories, Inc.
(part no. TCC-130)
2. BASF (product code 09797 XE)
3. Kaneon Corp.
(LC Engineering part no. LCT-7001)
4. Standard Tape Laboratory
(catalogue no. 28)
5. TEAC Corporation, Japan
(part no. MTT150)
6. TEAC Corporation of America
(part no. MTT150)
7. Victor Company of Japan, Ltd.
(part no. TMT-6130, VTT-727)
The CXA2559Q configures the playback equalizer amplifier by connecting the external capacitor C1 and
resistor R1 shown in Fig. 3.
Two systems (FORWARD and REVERSE) of playback head input are provided for each channel.
The FORWARD input pin is selected when DRSW (Pin 19) is Low; REVERSE is selected when DRSW is
High.
The playback equalizer amplifier frequency response can be set in two levels (70µs/120µs).
When TAPESW (Pin 18) is Low, Ri is 7kΩ; when TAPESW is High, Ri is 12kΩ.
The gain can be adjusted by connecting VR between PBOUT (Pins 2 and 9) and OUTREF (Pins 3 and 28); or
by using VR for the external R1.
Gain [dB]
G1
T1
–6dB/oct
T2
T3
f3f2f1Frequency [Hz]
Fig. 4. Playback equalizer amplifier frequency response
G1 = 20 log
G2, G3 = 20 log
T1 = C1 · (300k + Ri)
G2
T2, T3 =
G3
R1 + 300k
R1
R1 + Ri // 300k
R1
C1 · (R1 · 300k + 300k · Ri + Ri · R1)
R1 + R2
– 13 –
Page 14
4. Music sensor
TAPEIN2
R2
10k
R1
10k
× 1
× 1
VGS
D1
D2
R3
127k
AMP1
R4
100k
C1
64p
AMP2
Vcc
× 5
Fullwave
rectifier
Q1
Smoother
R5A
29k
R5B
10k
R6
1k
CXA2559Q
DVcc
R10
MSOUT
AMP3
0.775V for
signal detection
0.616V for no
signal detection
TAPEIN1
MSLPF
G1FB
C2
C3
R7
G2FB
C4
R8
MSTC
R9
C5
Fig. 5. Music sensor block diagram
(1)Adjustment of music signal interval detection level
Adjust the external resistors R7 and R8 to adjust the music signal interval detection level.
The signal detection level v1 and no signal detection level v2 are expressed by the following equations.
(2)Low-frequency cut-off adjustment of music sensor
Adjust the external resistors R7, R8 and the external capacitors C3, C4 to adjust the low-frequency cut-off.
The low-frequency cut-off is expressed by the following equation.
(3)High-frequency cut-off adjustment of music sensor
Connect the external capacitor C2 to MSLPF (Pin 10) to adjust the high-frequency cut-off.
The high-frequency cut-off is expressed by the following equation.
fc2 = 1/ (2π · (64p + C2) · 100k)
The high-frequency cut-off is approximately 25kHz when MSLPF is left open .
(4)Response time adjustment
Adjust the external resistor R9 and the external capacitor C5 to adjust the response time.
The response time for signal detection depends on the internal resistor R6 and the external capacitor C5.
The response time for no signal detection depends on the external resistor R9 and the external capacitor
C5.
– 14 –
Page 15
CXA2559Q
5. Operation mode control method
The CXA2559Q has a mute switch (MUTESW), playback equalizer amplifier select switch (TAPESW), head
input select switch (DRSW), music sensor mode select switch (MSMODE) and music sensor switch (MSSW).
The operation modes for each switch are shown in the following table.
Pin No.
17
18
19
20
21
MUTESW
TAPESW
DRSW
MSMODE
MSSW
Pin name
Low (OPEN)
MUTE OFF
70µs
PBIN FORWARD
G1
MS ON
High
MUTE ON
120µs
PBIN REVERSE
G2
MS OFF
Notes on Operation
1. DIREF pin resistance
The current on DIREF (Pin 25) is the reference for the playback equalizer amplifier resistor 7kΩ/12kΩ and
the comparator threshold value of the music sensor.
Use the resistor with high accuracy for connecting to the DIREF pin.
(The resistance accuracy of 2% <metal-oxide> is recommended.)
Pin voltage
2. Playback equalizer amplifier
The playback equalizer amplifier characteristics are determined by the resistor connected between the IC
internal resistor and PBFB (Pins 31 and 40) and the capacitor connected between PBFB and PBTC (Pins 1
and 30). Use the parts which satisfies the accuracy required for the playback equalizer amplifier.
3. Music sensor
The resistance and capacitance connected to G2FB (Pin 11) and G1FB (Pin 12) determine the detection
level and high-frequency cut-off.
The response time is determined by the resistance and capacitance connected to MSTC (Pin 13).
Use the parts which satisfies the accuracy required for the music sensor.
– 15 –
Page 16
Example of Representative Characteristics
Current consumption vs. Supply voltage
9.0
8.8
8.6
8.4
8.2
Ta = 25°C
CXA2559Q
8.0
Current consumption [mA]
7.9
5.06.09.010.011.0
7.08.0
Supply voltage [V]
No signal
MUTE OFF
70µs
MS ON
Playback equalizer amplifier frequency response
65
60
55
50
45
Gain [dB]
40
35
30
25
VCC = 8.0V
Input : PBFIN1
Output : PBOUT1
10010k
Frequency [Hz]
1k
Ta = 25°C
120µs
70µs
12.0
PBFIN
47µ
680
PBREF
PBREF
270
PBFB
0.01µ
300k
7k/12k
PBTC
Fig. 6. Measurement circuit for playback equalizer
amplifier frequency response
PBOUT
2.2µ
35
30
25
20
Gain [dB]
15
10
5
Line amplifier frequency response
VCC = 8.0V
Input : TAPEIN1
Output : LINEOUT1
10010k
Frequency [Hz]
1k
Ta = 25°C
– 16 –
Page 17
Total harmonic distortion (playback equalizer amplifier)