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AD500-8-13G 데이터시트(PDF) 2 Page - Sensortechnics GmbH |
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2 / 3 page 10/3/2013 AVALANCHE PHOTODIODE DATA @ 23 C SYMBOL CHARACTERISTIC TEST CONDITIONS MIN TYP MAX UNITS ID Dark Current M = 100 (see note 2) --- 0.5 2.0 nA C Capacitance M = 100 (see note 2) --- 2.2 --- pF VBR Breakdown Voltage (see note 1) ID = 2 µA 80 --- 160 V Temperature Coefficient of VBR --- 0.45 --- V/K Responsivity M = 100; = 800 nm 45 50 --- A/W 3dB Bandwidth -3dB --- 1.3 --- GHz tr Rise Time M = 100; = 905 nm; RL = 50 Ω --- 0.35 --- ns Optimum Gain 50 60 --- “Excess Noise” factor M = 100 --- 2.2 --- “Excess Noise” index M = 100 --- 0.2 --- Noise Current M = 100 --- 1.0 --- pA/Hz 1/2 Max Gain 200 --- --- NEP Noise Equivalent Power M = 100; = 905 nm --- 2.0 X 10 -14 --- W/Hz 1/2 Note 1: The following different breakdown voltage ranges are available: (80 – 120 V), (120 – 160 V). Note 2: Measurement conditions: Setup of photo current 1 nA at M = 1 and irradiated by a 880 nm, 80 nm bandwidth LED. Increase the photo current up to 100 nA, (M = 100) by internal multiplication due to an increasing bias voltage. TRANSIMPEDANCE AMPLIFIER DATA @ 25 C (Vcc = +3.0 V to 5.5 V, TA = 0°C to 70°C, 100Ω load between OUT+ and OUT-. Typical values are at TA = 25°C, Vcc = +3.3 V) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Supply Voltage 3 5 5.5 V Supply Current --- 34 63 mA Transimpedance Differential, measured with 40 µA p-p signal 2.10 2.75 3.40 k Output impedance Single ended per side 48 50 52 Maximum Differential Output Voltage Input = 2 mA p-p with 100 differential termination 220 380 575 mV p-p AC Input Overload 2 --- --- mA p-p DC Input Overload 1 --- --- mA Input Referred RMS Noise TO-52 package, see note 4 --- 490 668 nA Input Referred Noise Density See note 4 --- 11 --- pA/Hz 1/2 Small signal bandwidth Source capacitance = 0.85 pF, see note 3 1.525 2.00 --- GHz Low Frequency Cutoff -3 dB, input < 20 µA DC --- 30 --- kHz Transimpedance Linear Range Peak to peak 0.95 < linearity < 1.05 40 --- --- µA p-p Power Supply Rejection Ratio (PSRR) Output referred, f < 2 MHz, PSSR = -20 Log (∆Vout / ∆Vcc) --- 50 --- dB Note 3: Source capacitance for AD500-8-1.3G-MINI is the capacitance of APD. Note 4: Input referred noise is calculated as RMS output noise/ (gain at f = 10 Mhz). Noise density is (input referred noise)/√bandwidth. TRANSFER CHARACTERISTICS The circuit used is an avalanche photodiode directly coupled to a high speed data handling transimpedance amplifier. The output of the APD (light generated current) is applied to the input of the amplifier. The amplifier output is in the form of a differential voltage pulsed signal. The APD responsivity curve is provided in Fig. 2. The term Amps/Watt involves the area of the APD and can be expressed as Amps/mm 2/Watts/mm2, where the numerator applies to the current generated divided by the area of the detector, the denominator refers to the power of the radiant energy present per unit area. As an example assume a radiant input of 1 microwatt at 850 nm. The APD’s corresponding responsivity is 0.4 A/W. If energy in = 1 µW, then the current from the APD = (0.4 A/W) x (1 x 10 -6W) = 0.4 µA. We can then factor in the typical gain of the APD of 100, making the input current to the amplifier 40 µA. From Fig. 5 we can see the amplifier output will be approximately 75 mV p-p. APPLICATION NOTES The AD500-8-1.3G-MINI is a high speed optical data receiver. It incorporates an internal transimpedance amplifier with an avalanche photodiode. This device does not operate in DC mode or below 30 kHz. This detector requires +3.0 V to +5.5 V voltage supply for the amplifier and a high voltage supply (100-240 V) for the APD. The internal APD follows the gain curve published for the AD500-8-TO52-S1 avalanche photodiode. The transimpedance amplifier provides differential output signals in the range of 200 millivolts differential. The APD gain is voltage and temperature dependent. Some form of temperature compensation bias voltage control may be required. In order to achieve highest gain, the avalanche photodiode needs a positive bias voltage (Fig. 1). However, a current limiting resistor must be placed in series with the photodiode bias voltage to limit the current into the transimpedance amplifier. Failure to limit this current may result in permanent failure of the device. The suggested initial value for this limiting resistor is 390 KOhm. When using this receiver, good high frequency placement and routing techniques should be followed in order to achieve maximum frequency response. This includes the use of bypass capacitors, short leads and careful attention to impedance matching. The large gain bandwidth values of this device also demand that good shielding practices be used to avoid parasitic oscillations and reduce output noise. |
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