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LTC6754 Datasheet(PDF) 20 Page - Analog Devices |
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LTC6754 Datasheet(HTML) 20 Page - Analog Devices |
20 / 34 page ![]() LTC6563 20 Rev. 0 For more information www.analog.com • Increasing RLDIFF slightly reduces the signal bandwidth. • Output voltage compliance (VCOMPLIANCE) to be observed relative to RLDIFF , ADJ settings, and CM volt- age . Here is an example where output voltage compli- ance is violated: RLDIFF = 100Ω, Tilt = VCC, ADJ1 = 1, ADJ0 = 0, CM = 1.7V, IIN = 90µA Output Voltage (max) = VCM + IOUT –IOUTBAR 2 • RLDIFF 2 Referring to Table 2 to read output current values: Output Voltage (max) = 1.7V + 36mA – 6mA 2 • 100 Ω 2 = 2.45V! The maximum output voltage must remain below VCCO – 1V (~2.3V) to comply with the VCOMPLIANCE rating. Possible remedies are reducing output current(s) by using lower power ADJ settings, reducing the input APD current, reducing the differential load, or reducing the CM voltage. Power Considerations The LTC6563 has many power modes of operation. The state of the PWRMD, OMUX and ADJ pins will dictate the amount of current the LTC6563 will draw. Multiple power modes are offered to allow the user to select the appropriate one based upon the application while mini- mizing power dissipation. Coupling the TIA Input – AC vs DC Although the LTC6563 can AC-couple to the detector, best performance is achieved when DC-coupled to a negatively biased APD. DC-coupling reduces component count while allowing a DC current path from the APD. The LTC6563 OFFSET feature is designed to cancel DC currents. The maximum performance for switching speeds and satura- tion recovery occurs in this DC-coupled configuration. When AC-coupling to the TIA input, RB, is needed to establish a bias point for the detector. It is worth noting that RB is a parallel path with the TIA for the APD current to flow through and it will impact the effective signal chain output gain. This value of the biasing resistor and AC-coupling capaci- tor, CAC, can potentially create a long time-constant. CAC is chosen based on the reactance at the frequency of inter- est. However, RB ideally should be large to avoid stealing APPLICATIONS INFORMATION Figure 4. AC-Coupled Detector Circuit Table 3. LTC6563 Power Dissipation Modes. X = Don’t Care PWRMD OMUX ADJ1 ADJ0 IVCCI (mA) IVCCO (mA) ITOTAL (mA) DESCRIPTION 0 0 X X 4.5 0.1 4.6 LTC6563 shutdown. 0 1 0 0 21 24.5 45.5 LTC6563 enabled, non-selected inputs powered down, CM pin control disabled. This setting appropriate for a Responder device in a multi-chip/ multi-channel application. 0 1 0 1 21 38 59 0 1 1 0 21 51.5 72.5 0 1 1 1 21 64.5 85.5 1 0 X X 35 0.1 35.1 LTC6563 deselected (outputs stage off), non-selected inputs powered up. 1 1 0 0 34 24.5 58.5 LTC6563 enabled, non-selected inputs powered up, CM pin control active in setting output CM voltage. This setting appropriate for a Controller device in a multi-chip/multi-channel application. 1 1 0 1 34 38 72 1 1 1 0 34 51.5 85.5 1 1 1 1 34 64.5 98.5 –HV –HV CAC RB APD APD 6563 F04 AC-COUPLED TIA DC-COUPLED TIA |
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