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SM3320A 데이터시트(PDF) 8 Page - Nippon Precision Circuits Inc

부품명 SM3320A
상세설명  High-sensitivity preamplifier for ultraviolet to infrared detection using a single IC
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제조업체  NPC [Nippon Precision Circuits Inc]
홈페이지  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

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SM3320A
SEIKO NPC CORPORATION - 8
FUNCTIONAL DESCRIPTION
Basic Function
The SM3320A detects the current generated from a photodiode and outputs a voltage signal. The transimpedance of the preamplifier can
be adjusted for coarse adjustment of the sensitivity. The transimpedance adjustment range is 0.5MΩ to 60MΩ, set using 4 adjustment bits.
Also, a dark current compensation circuit is used to compensate photodiode output under dark lighting conditions for output voltage
stability with low temperature variation. The gain of the postamplifier can be adjusted for fine adjustment of the sensitivity. The gain
adjustment range is 1 to 4 times, set using 4 adjustment bits. Also, a built-in offset cancel circuit is used to provide low offset voltage at the
output.
The output voltage at the time of optical irradiation nothing outputs 0.1VDD, and calls this dark voltage. The maximum output voltage at the
time of optical irradiation is 0.7VDD.
The device can be addressed using address pin control. This function allows the transimpedance and gain settings to be adjusted for each
device independently, when multiple devices are connected in parallel.An output enable control (OE) is used for output control.
[Address andA[2:0] setting]
Address
A2 setting
A1 setting
A0 setting
[000]
VSS
VSS
VSS
[001]
VSS
VSS
VDD
[010]
VSS
VDD
VSS
[011]
VSS
VDD
VDD
[100]
VDD
VSS
VSS
[101]
VDD
VSS
VDD
[110]
VDD
VDD
VSS
[111]
VDD
VDD
VDD
Serial Interface
The SM3320Ause a 3-wire serial interface (SE, CLK, DATA) to access the device and to set an internal register to control device operation.
Note that extraneous signal input on the serial interface pins must be avoided when not reading/writing data to the device to prevent
incorrect operation.
Internal Register Structure
The device read/write mode, address, preamplifier transimpedance, and postamplifier gain are set in the internal register. The device can be
accessed for writing data to the register when theA[2:0] address write data bits match the setting of the address control inputs (A2 toA0).
RW
A2
A1
A0
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
----
CS1
CS0
TS1
TS0
GS3
GS2
GS1
GS0
Preamplifier
transimpedance
Postamplifier gain
Feedback
capacitance
Conversion time
R/W
Data
Adress
Don't care
(1) RW
Read/Write mode set bit. Set to “1” for read mode, and to “0” for write mode.
(2)AddressA[2:0] (A2 toA0)
Address bits.
(3) Preamplifier transimpedance CS[1:0] (D7 to D6) and TS[1:0] (D5 to D4)
Preamplifier transimpedance setting bits
(4) Postamplifier gain GS[3:0] (D3 to D0)
Postamplifier gain setting bits
Adress
Address
Address


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