cxa2559q Sony Electronics, cxa2559q Datasheet - Page 13

• Manufacturer Part Number: cxa2559q
• Description: Playback Equalizer Amplifier With Music Sensor
• Manufacturer: Sony Electronics

3. Playback equalizer amplifier
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 7k ; when TAPESW is High, Ri is 12k .
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.
Fig. 4. Playback equalizer amplifier frequency response
G1
Gain [dB]
f1
T1
–6dB/oct
Fig. 3. Playback equalizer amplifier block diagram
PB IN
PBREF
FWD
RVS
f2
PBFB
f3
T2
R1
T3
Frequency [Hz]
0.01µ
PBTC
C1
– 13 –
AMP1
PBOUT
300k
G2
G3
Ri
G1 = 20 log
G2, G3 = 20 log
T1 = C1 · (300k + Ri)
T2, T3 =
OUTREF
C1 · (R1 · 300k + 300k · Ri + Ri · R1)
R1 + 300k
to TAPEIN
R1
R1 + Ri // 300k
R1 + R2
R1
CXA2559Q