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PDF SM3322ARA Data sheet ( Hoja de datos )
| Número de pieza | SM3322ARA | |
| Descripción | Optical Sensor IC | |
| Fabricantes | NPC | |
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SM3322ARA
Optical Sensor IC
OVERVIEW
The SM3322ARA is a fluorescence detector IC with a built-in single picture element (pixel) photodiode of 1mm2 and programmable
signal conditioning circuit. The IC has an optical filter on chip with target condition 640nm ± 60nm, and it integrates all the elements
required for optical sensor into an ultra-miniature package. The signal condition circuit has a programmable gain amplifier with dark
current compensation circuit, so that it can operate in wider temperature range. With 3 addressing bits, up to 8 SM3322ARA can be
paralleled.
FEATURES
▪ Optical filter on chip with target condition: 640nm ± 60nm
▪ Dark current compensation circuit built-in for stable signal output
▪ Gain setting and output control function using serial interface
(DATA, SE, CLK, OE)
▪ Connection up to 8 devices in parallel according to 3-bit address setting
▪ Transimpedance range: 500kΩ to 240MΩ
▪ Photodiode detector size: 2.3mm×0.6mm
(1.0mm2 photodetector surface area)
▪Anti-reflection film coating reduces responsivity fluctuations
due to wavelength
▪ Supply voltage range: 2.7 to 5.5V (single supply)
▪ Current consumption: 1.5mA(typ)@VDD=5V, no load
▪ Operating temperature range: -40 to +85°C
▪ Package: 12 pin HCOB
ORDERING INFORMATION
Device
Package
SM3322ARA
12 pin HCOB
PACKAGE DIMENSIONS
(Unit: mm)
Y
B
Photodiode detector
A
X
3.2 ±0.1
1.15 ±0.2
Photodiode detector dimensions(Origin:Package center)
X
A -1.15
B 1.15
Y
-0.7
-0.1
0.35 0.5
0.25±0.05
Package type : 12pin HCOB
Package size : 3.2mm×5.5mm
Photodiode detector size : 2.3mm×0.6mm
(1.0mm2 photo detector surface area)
TYPICAL APPLICATION CIRCUIT
SM3322ARA
IC1
SM3322ARA
IC2
SM3322ARA
IC3
ADC
ADC
CPU
SEIKO NPC CORPORATION - 1
1 page  
SM3322ARA
Analog Electrical Characteristics
Recommended operating conditions using reference circuit, unless otherwise noted.
Parameter
Symbol
Conditions
MIN TYP MAX Unit
CS[00]
CS[01]
CS[10]
CS[11]
TS[00]
- 0.5 - MΩ
- 1.0 - MΩ
- 2.0 - MΩ
- 4.0 - MΩ
Preamplifier transimpedance*1
CS[00]
CS[01]
CS[10]
CS[11]
CS[00]
CS[01]
CS[10]
TS[01]
TS[10]
- 1.5 - MΩ
3.0 - MΩ
- 6.0 - MΩ
- 12.0 - MΩ
- 3.5 - MΩ
- 7.0 - MΩ
- 14.0 - MΩ
CS[11]
CS[00]
- 28.0 - MΩ
- 7.5 - MΩ
CS[01]
CS[10]
TS[11]
- 15.0 - MΩ
- 30.0 - MΩ
CS[11]
- 60.0 - MΩ
TS[00]
- 20 30 μs
Preamplifier conversion time
TS[01]
TS[10]
- 40 60 μs
- 80 120 μs
TS[11]
-
160 240
μs
Postamplifier gain error
- - ±1 dB
Dark voltage
REF reference, [01111111] below
REF reference, [11111111] below
-40
-60
-
-
40 mV
80 mV
*1. Design value: Preamplifier transimpedance is determined by specifying the preamplifier feedback capacitance (CS[1:0]) and preamplifier conversion
time (TS[1:0]). This is a virtual impedance called the preamplifier transimpedance. The preamplifier transimpedance (Rti) is calculated using the
following equation.
Rti
=
(Preamplifier conversion
Preamplifier feedback
time −10μ sec)
capacitance
The sample and hold circuit is synchronized to the preamplifier conversion time. To determine the output voltage, the sample and hold
circuit must complete one full cycle after photoirradiation. The photoirradiation time should be set to a value equal to or greater than the
detection time (double the maximum preamplifier conversion time) + analog output capture time. If photoirradiation ends before analog
output capture, the output voltage may drop or fall to zero. Photoirradiation should be continuous until analog output capture is completed.
.
Light Source
Photoirradiation time
Serial Interface
Analog output
load
Gain setting time
Output control time
Detection time
Analog output capture time
Preamplifier conversion time TS[00] TS[01] TS[10]
Detection time
≥60μs ≥120μs ≥240μs
Output voltage = VREF + (Rti × Photodiode photocurrent × Postamplifier gain)
TS[11]
≥480μs
SEIKO NPC CORPORATION - 5
5 Page 
REFERENCE CIRCUIT
CPU
SM3322ARA
SM3322ARA
10μF
Device with [000] address setting
Connect a laminated ceramic capacitor of 10μF or larger as close as possible to the supply voltage terminals.
The nominal value rating for each electrical characteristics parameter is measured using the reference circuit.
SEIKO NPC CORPORATION - 11
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| PDF Descargar | [ Datasheet SM3322ARA.PDF ] | |
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