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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： | 2/20頁 |
| 文件大小： | 1301K |
| 代理商： | AD8305 |
REV. A
–2–
AD8305–SPECIFICATIONS
(V
P
= 5 V, V
N
= 0 V, T
A
= 25 C, R
REF
= 200 k , and VRDZ connected to VREF, unless
otherwise noted.)
Parameter
Conditions
Min
Typ
Max
Unit
INPUT INTERFACE
Specified Current Range, I
PD
Input Current Min/Max Limits
Reference Current, I
REF
, Range
Summing Node Voltage
Temperature Drift
Input Offset Voltage
LOGARITHMIC OUTPUT
Logarithmic Slope
Pin 4, INPT, Pin 3, IREF
Flows toward INPT Pin
Flows toward INPT Pin
Flows toward IREF Pin
Internally Preset; May be Altered by User
–40
∞
C < T
A
< +85
∞
C
V
INPT
– V
SUM
, V
IREF
– V
SUM
Pin 9, VLOG
10 n
1 m
10 m
1 m
0.54
A
A
A
V
mV/
∞
C
mV
10 n
0.46
0.5
0.015
–20
+20
190
185
0.3
0.1
200
210
215
1.7
2.5
0.4
mV/dec
mV/dec
nA
nA
dB
m
V
÷
Hz
MHz
V
V
k
W
–40
∞
C < T
A
< +85
∞
C
Logarithmic Intercept
1
1
–40
∞
C < T
A
< +85
∞
C
10 nA < I
PD
< 1 mA
I
PD
> 1
m
A
I
PD
> 1
m
A
Law Conformance Error
Wideband Noise
2
Small Signal Bandwidth
2
Maximum Output Voltage
Minimum Output Voltage
Output Resistance
REFERENCE OUTPUT
Voltage wrt Ground
0.1
0.7
0.7
1.7
0.01
5
Limited by V
N
= 0 V
4.375
5.625
Pin 2, VREF
2.435
2.4
2.5
2.565
2.6
V
V
mA
W
–40
∞
C < T
A
< +85
∞
C
Sourcing (Grounded Load)
Load Current < 10 mA
Pin 10, BFIN; Pin 11, SCAL; Pin 12, VOUT
Maximum Output Current
Incremental Output Resistance
OUTPUT BUFFER
Input Offset Voltage
Input Bias Current
Incremental Input Resistance
Output Range
Incremental Output Resistance
Peak Source/Sink Current
Small Signal Bandwidth
Slew Rate
POWER SUPPLY
Positive Supply Voltage
Quiescent Current
Negative Supply Voltage (Optional)
20
2
–20
+20
mV
mA
M
W
V
W
mA
MHz
V/
m
s
Flowing out of Pin 10 or 11
0.4
35
V
P
– 0.1
0.5
25
15
15
R
L
= 1 k
W
to ground
Load Current < 10 mA
GAIN = 1
0.2 V to 4.8 V Output Swing
Pin 8, VPOS; Pin 6 and Pin 7, VNEG
(V
P
– V
N
)
￡
12 V
3
5
5.4
0
12
6.5
V
mA
V
(V
P
– V
N
)
￡
12 V
–5.5
NOTES
1
Other values of logarithmic intercept can be achieved by adjusting R
REF
.
2
Output noise and incremental bandwidth are functions of input current, measured using output buffer connected for GAIN = 1.
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