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ADL5304ACPZ-R2 数据表(PDF) 23 Page - Analog Devices |
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ADL5304ACPZ-R2 数据表(HTML) 23 Page - Analog Devices |
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23 / 32 page  Data Sheet ADL5304 Rev. A | Page 23 of 32 Table 4. VLOG Scaling Options Option Pin SCL1 Pin SCL2 Pin SCL3 Pin INPS Pin INMS VY (V/dec) IZ (A) VOFS (V) Single-Supply Operation (VNEG = 0 V; VSMx = DCBI = INPS = 1P5V) 11 VLOG INMS Open 1P5V SCL2 0.2 3.16 f 1.5 2 VLOG INMS VLOG 1P5V SCL2 0.15 0.01 f 1.5 3 VLOG INMS Ground 1P5V SCL2 0.2 0.01 f 2.0 4 VLOG Open Ground 1P5V Open 0.4 56.2 f 2.5 5 VLOG Open Open 1P5V Open 0.4 17.8 p 1.5 6 Open Open VLOG 1P5V Open 0.6 316 p 1.5 7 Open VLOG Open 1P5V Open 0.8 1.33 n 1.5 8 VLOG INMS 2VLT 1P5V SCL2 0.2 21.6 f 1.333 Dual-Supply Operation (VNEG < −2 V; VSMx = DCBI = INPS = Ground) 92 VLOG INMS Open Ground SCL2 0.2 100 n 0 10 VLOG INMS VLOG Ground SCL2 0.15 100 n 0 11 VLOG Open Open Ground Open 0.4 100 n 0 12 Open Open VLOG Ground Open 0.6 100 n 0 13 Open VLOG Open Ground Open 0.8 100 n 0 1 Default setup for single supply and VSMx = 1.5 V. 2 Default setup for dual supply and VSMx = ground. The default setups are noted in Table 4. Other intercepts are achieved by injecting different currents into the IDEN pin, for example, if IDEN = 1 μA, as shown in Figure 52, the VLOG transfer function is simply shifted by one decade to the right. One way of doing this is to put a precision 500 kΩ resistor between the 2VLT and IDEN pins in the single- supply default setup. The intercept is moved up to 31.62 fA, and all output voltages for a given INUM are lowered by one decade, that is, by 0.2 V at VLOG. For example, the new IDEN = 1 μA, and VLOG = 1.3 V for INUM = 100 nA. This is particularly useful if the slope is already as desired but the desired intercept cannot be achieved with the on-chip resistors. Only a shift toward the right makes sense because a shift to the left requires excessively large resistors. MONITOR AND PD BIAS (1.1× INUM) 2 3 4 5 6 8 7 30 17 31 26 VSM1 VSM2 RMNTR 32 VSM4 VSM3 IREF IDEN INUM 100nA Q2 Q1 Q3 1.5V 1.5V 10 9 VDEN INDN IMON 2VLT INNM 1P5V 1.5V VREF TEMP COMP VNUM ILOG VDEN SHIELD SHIELD PD 500kΩ VNUM Figure 52. Intercept Shifted One Decade Right via External Resistor, Reference Current IDEN = 1 μA Slope Inversion Table 4 lists only those slopes that are positive because this is the expected normal operation in measurement mode. The slopes can be inverted by two methods. By using INUM = IREF = 100 nA, in which case, the intercepts, IZ, are at larger currents mirrored from the values shown in Table 4 around the 100 nA reference current. For example, for the default setup with VY = 0.2 V/decade and IZ = 3.162 fA, swapping INUM and IDEN connections result in VY = −0.2 V/decade and IZ = 3.162 A. The second method is to simply swap the connections between the VNUM and VDEN pins and the inputs to the temperature compensation cell (INNM and INDN), as shown in Figure 53 (compare to Figure 52). This technique is particularly useful if both negative log slope and adaptive photodiode biasing via IMON are desired together. MONITOR AND PD BIAS (1.1× INUM) 2 3 4 5 6 8 30 31 VSM1 VSM2 VSM4 VSM3 RMNTR 32 IREF IDEN INUM 100nA Q2 Q1 Q3 10 9 VDEN INDN IMON VNUM INNM TEMP COMP VNUM VDEN SHIELD SHIELD PD FROM 1.5V VREF 7 Figure 53. Simple Slope Inversion Method |
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