
REV. A
–2–
AD8306–SPECIFICATIONS
Parameter
Conditions
Min
1
Typ
Max
1
Units
INPUT STAGE
Maximum Input
2
(Inputs INHI, INLO)
Differential Drive, p-p
±
3.5
±
4
+9
+22
1.28
–78
1000
2.5
1.725
V
dBV
dBm
nV/
√
Hz
dBm
pF
V
Equivalent Power in 50
Noise Floor
Equivalent Power in 50
Input Resistance
Input Capacitance
DC Bias Voltage
Terminated in 52.3
i
R
IN
Terminated 50
Source
400 MHz Bandwidth
From INHI to INLO
From INHI to INLO
Either Input
800
1200
LIMITING AMPLIFIER
Usable Frequency Range
At Limiter Output
Phase Variation at 100 MHz
Limiter Output Current
Versus Temperature
Input Range
3
Maximum Output Voltage
Rise/Fall Time (10%–90%)
(Outputs LMHI, LMLO)
5
400
MHz
MHz
Degrees
mA
%/
°
C
dBV
V
ns
R
LOAD
= R
LIM
= 50
, to –10 dB Point
Over Input Range –73 dBV to –3 dBV
Nominally 400 mV/R
LIM
–40
°
C
≤
T
A
≤
+85
°
C
585
±
2
1
–0.008
0
10
–78
1
+9
At Either LMHI or LMLO, wrt VPS2
R
LOAD
= 50
, 40
≤
R
LIM
≤
400
1.25
0.6
LOGARITHMIC AMPLIFIER
±
3 dB Error Dynamic Range
Transfer Slope
4
(Output VLOG)
From Noise Floor to Maximum Input
f = 10 MHz
f = 100 MHz
–40
°
C < T
A
< +85
°
C
f = 10 MHz
f = 100 MHz
–40
°
C
≤
T
A
≤
+85
°
C
100
20
19.6
20
–108
–108.4
–108
–0.009
±
0.4
0.34
2.34
2.10
50
1.0
0.3
3.5
120
73
dB
mV/dB
mV/dB
mV/dB
dBV
dBV
dBV
dB/
°
C
dB
V
V
V
mA
MHz
ns
ns
19.5
20.5
Over Temperature
Intercept (Log Offset)
4
19.3
–109.5
20.7
–106.5
Over Temperature
Temperature Sensitivity
Linearity Error (Ripple)
Output Voltage
–111
–105
Input from –80 dBV to +0 dBV
Input = –91 dBV, V
S
= +5 V, +2.7 V
Input = +9 dBV, V
S
= +5 V
Input = –3 dBV, V
S
= +3 V
2.75
Minimum Load Resistance, R
L
Maximum Sink Current
Output Resistance
Small-Signal Bandwidth
Output Settling Time to 2%
Rise/Fall Time (10%–90%)
40
0.75
To Ground
1.25
Large Scale Input, +3 dBV, R
L
≥
50
, C
L
≤
100 pF
Large Scale Input, +3 dBV, R
L
≥
50
, C
L
≤
100 pF
220
100
POWER INTERFACES
Supply Voltage, V
S
Quiescent Current
Over Temperature
Disable Current
Additional Bias for Limiter
Logic Level to Enable Power
Input Current when HI
Logic Level to Disable Power
2.7
13
11
5
16
16
0.01
2.0
6.5
20
23
4
2.25
V
S
60
V
mA
mA
μ
A
mA
V
μ
A
V
Zero-Signal, LMDR Open
–40
°
C < T
A
< +85
°
C
–40
°
C < T
A
< +85
°
C
R
LIM
= 400
(See Text)
HI Condition, –40
°
C < T
A
< +85
°
C
3 V at ENBL, –40
°
C < T
A
< +85
°
C
LO Condition, –40
°
C < T
A
< +85
°
C
2.7
40
1
–0.5
TRANSISTOR COUNT
# of Transistors
207
207
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
termination corresponds to an input of 0.2236 V rms. Hence, in the special case of 50
termination, dBV values
can be converted into dBm by adding a fixed offset of +13 to the dBV rms value.
3
Due to the extremely high Gain Bandwidth Product of the AD8306, the output of either LMHI or LMLO will be unstable for levels below –78 dBV (–65 dBm, re 50
).
4
Standard deviation remains essentially constant over frequency. See Figures 13, 14, 16 and 17.
Specifications subject to change without notice.
(V
S
= +5 V, T
A
= +25
8
C, f = 10 MHz, unless otherwise noted)