AD8305 datasheet(2/20 Pages) AD

2 / 20 page

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

Input Current Min/Max Limits

Flows toward INPT Pin

10 m

Reference Current, IREF, Range

Flows toward IREF Pin

10 n

1 m

Summing Node Voltage

Internally Preset; May be Altered by User

0.46

0.5

0.54

Temperature Drift

–40

∞C < TA < +85∞C

0.015

mV/

∞C

Input Offset Voltage

VINPT – VSUM, VIREF – VSUM

–20

+20

LOGARITHMIC OUTPUT

Pin 9, VLOG

Logarithmic Slope

190

200

210

mV/dec

–40

∞C < TA < +85∞C

185

215

mV/dec

Logarithmic Intercept

0.3

1.7

–40

∞C < TA < +85∞C

0.1

2.5

Law Conformance Error

10 nA < IPD < 1 mA

0.1

0.4

Wideband Noise

IPD > 1

0.7

mV÷Hz

Small Signal Bandwidth

IPD > 1

0.7

MHz

Maximum Output Voltage

1.7

Minimum Output Voltage

Limited by VN = 0 V

0.01

Output Resistance

4.375

5.625

REFERENCE OUTPUT

Pin 2, VREF

Voltage wrt Ground

2.435

2.5

2.565

–40

∞C < TA < +85∞C

2.4

2.6

Maximum Output Current

Sourcing (Grounded Load)

Incremental Output Resistance

Load Current < 10 mA

OUTPUT BUFFER

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

Input Offset Voltage

–20

+20

Input Bias Current

Flowing out of Pin 10 or 11

0.4

Incremental Input Resistance

Output Range

RL = 1 k

W to ground

VP – 0.1

Incremental Output Resistance

Load Current < 10 mA

0.5

Peak Source/Sink Current

Small Signal Bandwidth

GAIN = 1

MHz

Slew Rate

0.2 V to 4.8 V Output Swing

POWER SUPPLY

Pin 8, VPOS; Pin 6 and Pin 7, VNEG

Positive Supply Voltage

(VP – VN)

£ 12 V

Quiescent Current

5.4

6.5

Negative Supply Voltage (Optional)

(VP – VN)

£ 12 V

–5.5

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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