AD8307AR-REEL7 datasheet(2/20 Pages) AD

Part #	AD8307AR-REEL7

Description	Low Cost DC-500 MHz, 92 dB Logarithmic Amplifier

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–2–

REV. A

AD8307–SPECIFICATIONS (V

S = +5 V, TA = 25 C, RL

≥ 1M , unless otherwise noted)

Parameter

Conditions

Min

Typ

Max

Units

GENERAL CHARACTERISTICS

Input Range (

±1 dB Error)

Expressed in dBm re 50

Ω

–72

16

dBm

Logarithmic Conformance

f

≤ 100 MHz, Central 80 dB

±0.3

±1dB

f = 500 MHz, Central 75 dB

±0.5

dB

Logarithmic Slope

Unadjusted

1

23

25

27

mV/dB

vs. Temperature

23

27

mV/dB

Logarithmic Intercept

Sine Amplitude; Unadjusted

2

20

µV

Equivalent Sine Power in 50

Ω

–87

–84

–77

dBm

vs. Temperature

–88

–76

dBm

Input Noise Spectral Density

Inputs Shorted

1.5

nV/

√Hz

Operating Noise Floor

RSOURCE = 50 Ω/2

–78

dBm

Output Resistance

Pin 4 to Ground

10

12.5

15

k

Ω

Internal Load Capacitance

3.5

pF

Response Time

Small Signal, 10%-90%,

400

ns

0 mV–100 mV, CL = 2 pF

Large Signal, 10%-90%,

500

ns

0 V–2.4 V, CL = 2 pF

Upper Usable Frequency

3

500

MHz

Lower Usable Frequency

Input AC-Coupled

10

Hz

AMPLIFIER CELL CHARACTERISTICS

Cell Bandwidth

–3 dB

900

MHz

Cell Gain

14.3

dB

INPUT CHARACTERISTICS

DC Common-Mode Voltage

Inputs AC-Coupled

3.2

V

Common-Mode Range

Either Input (Small Signal)

–0.3

1.6

VS – 1

V

DC Input Offset Voltage

4

RSOURCE ≤ 50 Ω

50

500

µV

Drift

0.8

µV/°C

Incremental Input Resistance

Differential

1.1

k

Ω

Input Capacitance

Either Pin to Ground

1.4

pF

Bias Current

Either Input

10

25

µA

POWER INTERFACES

Supply Voltage

2.7

5.5

V

Supply Current

VENB ≥ 2 V

8

10

mA

Disabled

VENB ≤ 1 V

150

750

µA

NOTES

1This may be adjusted downward by adding a shunt resistor from the Output to Ground. A 50 k

Ω resistor will reduce the nominal slope to 20 mV/dB.

2This may be adjusted in either direction by a voltage applied to Pin 5, with a scale factor of 8 dB/V.

3See Application on 900 MHz operation.

4Normally nulled automatically by internal offset correction loop. May be manually nulled by a voltage applied between Pin 3 and Ground; see APPLICATIONS.

Specifications subject to change without notice.

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