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PDF CXA3668N Data sheet ( Hoja de datos )
| Número de pieza | CXA3668N | |
| Descripción | Reception Analog Signal Processor IC | |
| Fabricantes | Sony Corporation | |
| Logotipo |  |
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CXA3668N
Reception Analog Signal Processor IC for Infrared Space Digital Audio Communication
Description
The CXA3668N is an IC that performs reception side
analog signal processing for optical communication
in combination with an infrared photodiode within a
Digital Infrared Audio Transmission (DIAT) system.
This IC incorporates a low noise trans-conductance
amplifier (I/V amplifier) that converts the optical
current from the photodiode into a voltage and
amplifies it, an AGC amplifier, a low-pass filter, band-
pass filters, and an output amplifier.
The band-pass filters are used to separate the
desired signal and the interfering signal. This chip
has the two types of Full (3 to 6MHz) and Half (3 to
4.5MHz) band-pass filters, and these can be
switched according to the application.
• Full: Full-band width (3 to 6MHz)
• Half: Half-band width (3 to 4.5MHz)
24 pin SSOP (Plastic)
Features
• Wide dynamic range
• On-chip I/V amplifier
• On-chip output filter
• Filter band switching pin
• Surface mounting package (24-pin SSOP)
Applications
• Infrared headphones
• Infrared speakers
Structure
Bi-CMOS IC
Absolute Maximum Ratings (Ta = 25°C)
• Supply voltage
VCCI, VCC2, VCCS, VCCO
• Storage temperature
Tstg
• Allowable power dissipation PD
3.3
–55 to +150
400
V
°C
mW
Recommended Operating Conditions
• Supply voltage
VCCI, VCC2, VCCS, VCCO
• Operating temperature
Topr
2.3 to 2.7
–40 to +85
V
°C
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.
–1–
E04244-PS
1 page  
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CXA3668N
Pin
No.
Symbol
I/O
Standard
voltage level
Equivalent circuit
Vcc2
21 AGCIREF2
0.2V
21
22 VCC2
+2.5V
(Typ.)
GND2
Vcc2
Description
Reference current generation
for determining the AGC2
attack time.
Connect to GND2 through a
390Ω or more resistor.
Reducing the resistance value
shortens the attack time.
AGC power supply.
23 AGCIREF3
1.25V
Reference current generation
for determining the input AGC
23 and the AGC2 recovery time.
Connect to VCC2 through a
33kΩ resistor.
GND2
24 AGCCAP1
Vcc2
GND2
24
Input AGC response setting.
Connect to VCC2 through a
capacitor.
–5–
5 Page 
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CXA3668N
40
30
20
10
0
–10
–20
–30
–40
0.1
INPUT frequency response
(Ta = 25˚C, VCC = 2.5V)
Ip = 100µAp-p
Ip = 300µAp-p
Ip = 1mAp-p
1 10
Frequency [MHz]
Fig. 6
100
(4) AGCIN
The signal input from AGCIN (Pin 7) and the I/V amplifier output signal are added and converted to a differential
signal. This differential signal is input to the gain control amplifier (GCA), and the GCA output is input to the filter.
When using AGCIN, input through a coupling capacitor C (100pF). When not using AGCIN, connect it to GND
through C (100pF).
(5) Band-pass filter
Full-band mode and Half-band mode can be selected by the DIVCODE (Pin 14) pin voltage.
The cutoff frequencies (fc) for the Full-band and Half-band modes which correspond to the DIVCODE pin
voltage are as follows.
DIVCODE
Low
High
Mode
Full-band (3MHz to 6MHz)
Half-band (3MHz to 4.5MHz)
High; 1.5V to VCC, Low; 0 to 0.5V
– 11 –
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