Photoconverter FTS202. Reference data

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Photoconverter FTS202. Reference data

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The FTS202 photoconverter is a silicon-based microcircuit containing a photodiode with an area of 2x2 mm2 and a unit of charge-coupled elements in series with it on one chip. The microcircuit is designed to convert (integrate) the current of the photodiode into an equivalent voltage level. A characteristic feature of the converter, which distinguishes it from similar devices, is higher photoconversion characteristics.

Structurally, the photoconverter is made in a round glass-to-metal case 301.8-1 with eight rigid wire leads (Fig. 1). In the housing cover on the side opposite to the terminals, a round hole is provided for light access.

Photoconverter FTS202

The FTS202 photoconverter can be used both in precision electron-optical systems and in household equipment.

Converter pinout: pin. 1 - substrate, positive output of the supply voltage; pin. 2 - bias voltage input of the photodiode; pin. 3 - input of the pulse of the end of the charge accumulation cycle and the start of reading; pin. 4 - input of the pulse of the end of the reading cycle; pin. 5 - input of the initial drain voltage; pin. 6 - exit; pin. 7 - negative output of the supply voltage; pin. 8 - free.

Main Specifications

Working spectral range, nm......200...1100
Conversion coefficient, V/W, not less, at radiation wavelength 900 nm......2x1011
Dynamic range, not less......107
Sensitivity threshold in a single frequency band, W·Hz-1/2, not worse......10-14
Linearity of conversion, %, not worse......0,1
Temperature instability of sensitivity, %, no more, at a radiation wavelength of 300 nm......0,1
Photocurrent integration time interval, ms......1...200
Supply voltage, V ...... 12
Limits of output voltage change when the illumination of the photoconverter changes from minimum to maximum, V, not less than ...... 6
Dark voltage level, V......3,5...6
Power consumption, mW, not more than ..... 10

The absolute spectral sensitivity of the FTS202 photoconverter in the operating wavelength range is shown in Fig. . 2.

Photoconverter FTS202

To ensure the operation of the FTs202 photoconverter, it is necessary to supply it, in addition to the supply voltage, with two short low-level pulses, one to input F, and the other to RG. These pulses must have, firstly, the same period, since its value determines the required time of the photocurrent integration cycle, and, secondly, a shift (phase shift) in time. The pulse offset, more precisely, the time between the positive pulse edge F and the negative pulse edge RG, sets the interval during which a voltage equivalent to the integral of the photocurrent will be present at the output of the device. The rest of the time the output will be at a level close to the dark voltage.

Pulses with the required parameters can be generated using CMOS chips. On fig. 3 shows one of the many possible options for the pulse shaper circuit and its connection to the FTS202 converter.

Photoconverter FTS202

On fig. 4 shows signal diagrams at characteristic points of the device.

Photoconverter FTS202

The master oscillator on inverters CMOS DD1.1, DD1.2 generates a continuous sequence of pulses with a frequency of about 50 Hz, the shape of which is close to the "meander". Two paraphase sequences are removed from the generator. One from the output of the inverter DD1.2 goes through the differentiating circuit R2C2 to the input of the inverter DD1.3, the second - from the output of the inverter DD1.1 through a similar differentiating circuit R3C3 - to the input of the inverter DD1.4. In this case, the differentiating circuits along the front of the input pulses form short positive pulses with a swing of up to about 7 V. Negative pulses with a duration of about 1.3 μs are formed at the output of the inverters DD1.4, DD15.

They arrive at the F and RG inputs of the photoconverter and control its operation. Their period sets the photocurrent integration cycle tc.i - about 20 ms, and the time offset - the duration of the output signal (exposure time) te - about 10 ms. In the general case, the time offset interval of the clock pulses at the inputs F and RG can be set arbitrarily, but within certain limits, according to which the pulse shaper circuit is built.

This makes it possible to arbitrarily set the type (shape) of the output signal - from short pulses to an almost constant level. In the case when it is required to obtain the maximum possible threshold sensitivity, the photocurrent integration time (cycle) should also be maximum, i.e., the pulse period at the F and RG inputs should reach 200 ms.

The supply voltage can also be changed in the range from 5 to 15 V, but in this case both the dark voltage level and the limits of the output signal voltage change will change accordingly - from about 2 to 7 V. If necessary, the dark voltage level can be easily shifted to zero by connecting the VD1R5 circuit to the output of the photoconverter. The type of zener diode depends on the bias value; for example, with a supply voltage of 12 V, a KS168A zener diode is suitable.

Author: O.Cherevan, St. Petersburg

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