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AD8305ACP-REEL7 Scheda tecnica(PDF) 2 Page - Analog Devices

Il numero della parte AD8305ACP-REEL7
Spiegazioni elettronici  100 dB Range (10 nA to 1 mA) Logarithmic Converter
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD8305ACP-REEL7 Scheda tecnica(HTML) 2 Page - Analog Devices

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


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