REV. B

–2–

AD8309–SPECIFICATIONS

Parameter

Conditions

Min

1

Typ

Max

1

Units

INPUT STAGE

(Inputs INHI, INLO)

Maximum Input

2

Differential Drive, p-p

±3.5

±4V

+9

dBV

Equivalent Power in 50

Ω

Terminated in 52.3

Ω

+22

dBm

Noise Floor

Terminated 50

Ω Source

1.28

nV/

√Hz

Equivalent Power in 50

Ω

500 MHz Bandwidth

–78

dBm

Input Resistance

From INHI to INLO

800

1000

1200

Ω

Input Capacitance

From INHI to INLO

2.5

pF

DC Bias Voltage

Either Input

1.725

V

LIMITING AMPLIFIER

(Outputs LMHI, LMLO)

Usable Frequency Range

5

500

MHz

At Limiter Output

Ω to –10 dB Point

875

MHz

Phase Variation at 100 MHz

Over Input Range –60 dBm to +10 dBm

±3

Degrees

Limiter Output Current

0110

mA

Versus Temperature –40

°C ≤ T

A

≤ +85°C

–0.008

%/

°C

Input Range

3

–78

+9

dBV

Equivalent dBm

–65

+22

dBm

Maximum Output Voltage

At Either LMHI or LMLO, wrt VPS2

1

1.25

V

Rise/Fall Time (10%–90%)

≤ 50 Ω, 40 Ω ≤ R

LIM

≤ 400 Ω

0.4

ns

LOGARITHMIC AMPLIFIER

(Output VLOG)

±3 dB Error Dynamic Range

From Noise Floor to Maximum Input

100

dB

Transfer Slope

5 MHz

≤ f ≤ 200 MHz

18

20

22

mV/dB

Over Temperature –40

°C < T

°C

17

20

23

mV/dB

Intercept (Log Offset)

5 MHz

≤ f ≤ 200 MHz

–116

–108

–100

dBV

Equivalent dBm (re 50

Ω)

–103

–95

–87

dBm

Over Temperature –40

°C ≤ T

A

≤ +85°C

–117

–108

–99

dBV

Equivalent dBm (re 50

Ω)

–104

–95

–86

dBm

Temperature Sensitivity

–0.009

dB/

°C

Linearity Error (Ripple)

Input from –83 dBV (–70 dBm) to +7 dBV (+20 dBm)

±0.4

dB

Output Voltage

0.34

V

2.34

2.75

V

2.10

V

40

50

Ω

Maximum Sink Current

To Ground

0.75

1.0

1.25

mA

Output Resistance

0.3

Ω

Small-Signal Bandwidth

3.5

MHz

Output Settling Time to 1%

Large Scale Input, +3 dBV (+16 dBm),

≥ 50 Ω, C

L

≤ 100 pF

120

220

ns

Rise/Fall Time (10%–90%)

Large Scale Input, +3 dBV (+16 dBm),

67

100

ns

POWER INTERFACES

2.7

5

6.5

V

Quiescent Current

Zero-Signal, LMDR Open

13

16

20

mA

Over Temperature

–40

°C < T

°C

111623

mA

Disable Current

–40

°C < T

0.01

4

µA

Additional Bias for Limiter

Ω (See Text)

1.4

1.6

mA

Logic Level to Enable Power

HI Condition, –40

°C < T

°C

1.8

V

Input Current when HI

3 V at ENBL, –40

°C < T

60

µA

Logic Level to Disable Power

LO Condition, –40

°C < T

°C

–0.5

1

V

NOTES

1 V rms. A power level of 0 dBm (1 mW) in a 50

Ω termination corresponds to an input of 0.2236 V rms. Hence, the relationship between dBV and dBm is a fixed

offset of +13 dBm in the special case of a 50

Ω termination.

Ω).

Specifications subject to change without notice.