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CXA3668N Datenblatt(PDF) 8 Page - Sony Corporation

Teilenummer CXA3668N
Bauteilbeschribung  Reception Analog Signal Processor IC for Infrared Space Digital Audio Communication
Download  16 Pages
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Hersteller  SONY [Sony Corporation]
Direct Link  http://www.sony.co.jp
Logo SONY - Sony Corporation

CXA3668N Datenblatt(HTML) 8 Page - Sony Corporation

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CXA3668N
Description of Operation
(1) Trans-impedance amplifier circuit (I/V amplifier)
The input block is comprised of the trans-impedance amplifier circuit which converts the optical current Ip from
the photodiode into a current, and the AGCATT circuit.
Fig. 1 shows the I/V amplifier equivalent circuit.
The following equations are satisfied in the circuit shown in Fig. 1.
vo = –A
× vi
vi – vo = i
× Zt
The input impedance Zi of the I/V amplifier is obtained from these equations as follows.
Zi = vi/i = Zt/ (1 + A)
The trans-impedance Zt of this IC is 4k
Ω (typ.) and the amplifier gain A is 65 times (typ.), so Zi is 60.6Ω (typ.).
(2) AGC ATT
The IC operates at an input optical current of up to 1mAp-p (max.), so the trans-impedance input current It is
controlled so that the trans-impedance amplifier circuit does not produce a saturated state.
Labeling the SIS impedance as Zs, It = Ip
× Zs/(Zs + Zin).
It is controlled so that the trans-impedance amplifier circuit output does not go to 250mVp-p or more, and
when Ip is 63.5µAp-p or less, It = Ip (Zs >> Zin).
When Ip is 63.5µAp-p or more and 1mAp-p or less, Zs decreases and Ip goes to 63.5µAp-p so that the trans-
impedance output level is 250mVp-p.
• The AGC ATT attack time and recovery time response are as follows.
The attack time and the recovery time are determined by the capacitor Ca connected between AGCCAP1
(Pin 24) and VCC2. Increasing the Ca value lengthens both the attack time and the recovery time, and
reducing the Ca value shortens both the attack time and the recovery time.
The reference current (Iat = 0.2/Raa) used to determine the attack time is determined by the resistor Raa
connected between AGCIREF1 (Pin 1) and GND. Reducing the resistance value increases the reference
current and shortens the attack time. Increasing the resistance value lengthens the attack time.
The reference current (Iar = 0.625/Rar) used to determine the recovery time is determined by the resistor
Rar connected between AGCIREF3 (Pin 23) and VCC. Use a Rar of 33k
Ω.
Fig. 1
Zt
vo
vi
i
–A
Zt: Trans-impedance
A: Amplifier gain


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