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AD8305ACPZ-R2

100 dB Range (10 nA to 1 mA) Logarithmic Converter

Analog Devices 

Data Sheet

AD8305

SPECIFICATIONS

VP = 5 V, VN = 0 V, TA = 25°C, RREF = 200 kΩ, and VRDZ connected to VREF, unless otherwise noted.

Table 1.

Parameter

INPUT INTERFACE

Specified Current Range, IPD

Conditions

Pin 4, INPT, Pin 3, IREF

Flows toward INPT pin

Min Typ

10

Input Current Min/Max Limits

Flows toward INPT pin

Reference Current, IREF, Range

Flows toward IREF pin

10

Summing Node Voltage

Temperature Drift

Input Offset Voltage

LOGARITHMIC OUTPUT

Logarithmic Slope

Logarithmic Intercept1

Law Conformance Error

Wideband Noise2

Small Signal Bandwidth2

Maximum Output Voltage

Minimum Output Voltage

Output Resistance

REFERENCE OUTPUT

Voltage With Reference to Ground

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)

Internally preset; may be altered by the user

−40°C < TA < +85°C

VINPT − VSUM, VIREF − VSUM

Pin 9, VLOG

−40°C < TA < +85°C

−40°C < TA < +85°C

10 nA < IPD < 1 mA

IPD > 1 µA

IPD > 1 µA

Limited by VN = 0 V

Pin 2, VREF

−40°C < TA < +85°C

Sourcing (grounded load)

Load current < 10 mA

Pin 10, BFIN; Pin 11, SCAL; Pin 12, VOUT

Flowing out of Pin 10 or Pin 11

RL = 1 kΩ 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

(VP − VN) ≤ 12 V

(VP − VN) ≤ 12 V

0.46 0.5

0.015

−20

190

200

185

0.3

1

0.1

0.1

0.7

0.7

1.7

0.01

4.375 5

2.435 2.5

2.4

20

2

−20

0.4

35

VP − 0.1

0.5

25

15

15

3

5

5.4

−5.5 0

1 Other values of logarithmic intercept can be achieved by adjusting RREF.

2 Output noise and incremental bandwidth are functions of input current, measured using output buffer connected for GAIN = 1.

Max Unit

nA

1

mA

10

mA

nA

1

mA

0.54 V

mV/°C

+20 mV

210

215

1.7

2.5

0.4

5.625

mV/dec

mV/dec

nA

nA

dB

mV√Hz

MHz

V

V

kΩ

2.565 V

2.6

V

mA

Ω

+20 mV

mA

MΩ

V

Ω

mA

MHz

V/µs

12

V

6.5

mA

V

Rev. C | Page 3 of 24

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