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AD53020 bảng dữ liệu(PDF) 4 Page - Analog Devices |
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AD53020 bảng dữ liệu(HTML) 4 Page - Analog Devices |
4 / 4 page AD53020 –4– REV. A A second bias current reference is employed to set the bias current of the delay cells. This current is set by the external resistor at REXT2. A 2.94 k Ω resistor sets the nominal bias current of 500 µA. The nominal voltage at the REXT2 pin is –1.47 V. The current references require compensation capacitors of 0.1 µF to V EE at each of the COMP1 and COMP2 pins. In addition, each VEE supply pin should also have its own decou- pling capacitor of 0.1 µF to ground. All decoupling capacitors should be located as close as possible to the AD53020 chip. The mode is set by the inputs S0 and S1. These pins use stan- dard ECL levels, with the addition of a third level for the S1 Pin, which can also be connected to VEE. Refer to Table I for the description of the modes and their respective settings. For Modes 2 and 3, it is important to note that an internal flip- flop is used to provide the independent control of rising and falling edges. The state of this flip-flop is indeterminate upon power-up. The state becomes fixed once the first full pulse is provided to each channel, consisting of a positive edge followed by a negative edge. Table I. Truth Table for Mode Determination Typical Independent Adjustment of S1 S0 Mode Span Positive and Negative Edges? 0 0 0 19 ns No 0 1 1 31 ns No 1 0 2 19 ns Yes 1 1 3 31 ns Yes VEE 0 Not Valid VEE 1 5 45 ns No S0 and S1 accept logical ECL levels. In the case of S1 only, a third state is also accepted, at the negative supply, VEE. Table II. Package Thermal Characteristics Air Flow, FM JA, C/W 0 30.2 400 20.9 6 PIN 1 IDENTIFIER 7 40 39 17 18 29 28 TOP VIEW (PINS DOWN) 0.695 (17.65) 0.685 (17.40) SQ 0.656 (16.66) 0.650 (16.51) SQ 0.048 (1.21) 0.042 (1.07) 0.048 (1.21) 0.042 (1.07) 0.020 (0.50) R 0.021 (0.53) 0.013 (0.33) 0.050 (1.27) BSC 0.63 (16.00) 0.59 (14.99) 0.032 (0.81) 0.026 (0.66) 0.180 (4.57) 0.165 (4.19) 0.040 (1.01) 0.025 (0.64) 0.025 (0.63) 0.015 (0.38) 0.110 (2.79) 0.085 (2.16) 0.056 (1.42) 0.042 (1.07) 44-Lead PLCC (P-44A) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). |
Số phần tương tự - AD53020 |
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Mô tả tương tự - AD53020 |
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