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參數資料
| 型號： | AD8305 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 100 dB Range (10 nA to 1 mA) Logarithmic Converter |
| 中文描述： | 100分貝范圍（10 nA的1毫安）對數轉換器 |
| 文件頁數： | 15/20頁 |
| 文件大小： | 1301K |
| 代理商： | AD8305 |
REV. A
AD8305
–15–
Table I. Evaluation Board Configuration Options
Component
Function
Default Condition
P1
P2, R8, R9, R10,
R11, R17, R18
Supply Interface. Provides access to supply pins, VNEG, COMM, and VPOS. P1 = Installed
Monitor Interface. By adding 0
W
resistors to R8, R9, R10, R11, R17,
and R18, P2 = Not Installed
the VRDZ, VREF, VSUM, VOUT, and VLOG pin voltages can be monitored
using a high impedance probe.
R2, R3, R4, R6, R14, Buffer Amplifier/Output Interface. The logarithmic slope of the AD8305
C2, C7, C9, C10
can be altered using the buffer’s gain-setting resistors,
R2 and R3. R4, R14,
and C2 allow variation in the buffer loading.
R6, C7, C9, and C10 are
provided for a variety of filtering applications.
R8 = R9 = R10 = Open (Size 0603)
R17 = R18 = Open (Size 0603)
R2 = R6 = 0
W
(Size 0603)
R3 = R4 = Open (Size 0603)
R11 = R14 = 0
W
(Size 0603)
C2 = C7 = Open (Size 0603)
C9 = C10 = Open (Size 0603)
VLOG = VOUT = Installed
R1 = 200 k
W
(Size 0603)
R7 = R19 = 0
W
(Size 0603)
R1, R7, R19, R20
Intercept Adjustment. The voltage dropped across resistor R1 determines the
intercept reference current, nominally set to 10
m
A using a 200 k
W
1% resistor.
R7 and R19 can be used to adjust the output-offset voltage at the VLOG output. R20 = Open (Size 0603)
Supply Decoupling.
R12, R15, C3,
C4, C5, C6
C3 = C4 = 0.01 F
(Size 0603)
C5 = C6 = 0.1 F (Size 0603)
R12 = R15 = 0
W
(Size 0603)
C11 = 1 nF (Size 0603)
R13 = R16 = 1 k
W
(Size 0603)
C1 = C8 = 1 nF (Size 0603)
IREF = INPT = Installed
PD = Not Installed
LK1 = Installed
R5 = Open (Size 0603)
C11
R13, R16, C1, C8
VSUM Decoupling Capacitor.
Input Compensation. Provides essential HF compensation at the input pins,
INPT and IREF.
Input Interface. The test board is configured to accept a current through the
SMA connector labeled INPT. An SC-style packaged photodiode can be
used in place of the INPT SMA for optical interfacing. By removing R1 and
adding a 0
W
short for R5, a second current can be applied to the IREF input
(also SMA) for evaluating the AD8305 in log-ratio applications.
SC-Style Photodiode. Allows for direct mounting of SC style photodiodes.
IREF, INPT, PD,
LK1, R5
J1
J1 = Not Installed
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