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CXA3791EN Datenblatt(PDF) 6 Page - Sony Corporation

Teilenummer CXA3791EN
Bauteilbeschribung  High-speed Buffer Amplifier for CCD Image Sensor
Download  13 Pages
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Hersteller  SONY [Sony Corporation]
Direct Link  http://www.sony.co.jp
Logo SONY - Sony Corporation

CXA3791EN Datenblatt(HTML) 6 Page - Sony Corporation

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CXA3791EN
- 6 -
Description of Operation
Current Settings
1. Output Drive Current
The small signal output impedance of the OUT pin (Pin 3) can be set by connecting the IDRV pin (Pin 4) to VCC
through a resistor. The inflow current to the IDRV pin is multiplied by 10 times inside the IC, and flows as the
output stage idling current.
The IDRV pin has an internal 50k
Ω resistor, so the inflow current to the IDRV pin can be calculated as follows.
IIDRV = (VCC – VBE
× 2)/(RIDRV + 50kΩ)
= (13 – 1.46)/(180k
Ω + 50kΩ)
= 50.2
μA
Here, VCC = 13V, VBE = 0.73V (typ.), and RIDRV = 180k
Ω.
The small signal output impedance at this time can be calculated as follows.
ROUT = (26mV/(10
× IIDRV))/2
= (26mV/502
μA)/2
= 26
Ω
2. Sink Current for CCD with open source output
The sink current of the IN pin (Pin 6) can be set by connecting the ISF pin (Pin 1) to VCC through a resistor.
This sink current can be used as the CCD output stage source follower drive current. The inflow current to the
ISF pin is multiplied by 58 times inside the IC, and flows as the sink current.
The ISF pin has an internal 50k
Ω resistor, so the inflow current to the ISF pin can be calculated as follows.
IISF = (VCC – VBE
× 2)/(RISF + 50kΩ)
= (13 – 1.46)/(180k
Ω + 50kΩ)
= 50.2
μA
Here, VCC = 13V, VBE = 0.73V (typ.), and RISF = 180k
Ω.
The sink current at this time can be calculated as follows.
Isink = 58
× IISF
= 2.9mA
Note) This IC operation depends on IDRV and ISF.
Set the external resistance so that IDRV and ISF current are 90
μA or less, referring to the table shown
below.
[IDRV and ISF vs. external resistor]
Current (
μA)
90
68
50
35
26
Unit
When VCC = 15V
100
150
220
330
470
k
Ω
When VCC = 13V
78
120
180
270
390
k
Ω


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