Datasheet

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 R
LOAD
= R
LIM
= 50 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 Nominally 400 mV/R
LIM
0110mA
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%) R
LOAD
≤ 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
A
< +85°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 Input = –91 dBV (–78 dBm) V
S
= +5 V, +2.7 V 0.34 V
Input = +9 dBV (+22 dBm) V
S
= +5 V 2.34 2.75 V
Input = +9 dBV (+22 dBm) V
S
= +2.75 V 2.10 V
Minimum Load Resistance, R
L
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),
R
L
≥␣ 50 Ω, C
L
≤␣ 100 pF 120 220 ns
Rise/Fall Time (10%–90%) Large Scale Input, +3 dBV (+16 dBm),
R
L
≥␣ 50 Ω, C
L
≤␣ 100 pF 67 100 ns
POWER INTERFACES
Supply Voltage, V
POS
2.7 5 6.5 V
Quiescent Current Zero-Signal, LMDR Open 13 16 20 mA
Over Temperature –40°C < T
A
< +85°C 111623mA
Disable Current –40°C < T
A
< +85°C 0.01 4 µA
Additional Bias for Limiter R
LIM
= 400 Ω (See Text) 1.4 1.6 mA
Logic Level to Enable Power HI Condition, –40°C < T
A
< +85°C 1.8 V
POS
V
Input Current when HI 3 V at ENBL, –40°C < T
A
< +85°C4060µA
Logic Level to Disable Power LO Condition, –40°C < T
A
< +85°C –0.5 1 V
NOTES
1
Minimum and maximum specified limits on parameters that are guaranteed but not tested are six sigma values.
2
The input level is specified in “dBV” since logarithmic amplifiers respond strictly to voltage, not power. 0 dBV corresponds to a sinusoidal single-frequency input of
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.
3
Due to the extremely high Gain Bandwidth Product of the AD8309, the output of either LMHI or LMLO will be unstable for levels below –78 dBV (–65 dBm, re 50 Ω).
Specifications subject to change without notice.
(V
S
= +5 V, T
A
= +25ⴗC, unless otherwise noted)