AD8313ARM Analog Devices Inc, AD8313ARM Datasheet - Page 22

• Manufacturer Part Number: AD8313ARM
• Description: IC LOGARTIHMIC AMP 70DB 8-MSOP
• Manufacturer: Analog Devices Inc
• Type: Logarithmic Ampr

Specifications of AD8313ARM

• Rohs Status: RoHS non-compliant
• Frequency: 100MHz ~ 2.5GHz
• Rf Type: RADAR, 802.11/Wi-Fi, 8.2.16/WiMax, Wireless LAN
• Input Range: -65dBm ~ 0dBm
• Accuracy: ±1dB
• Voltage - Supply: 2.7 V ~ 5.5 V
• Current - Supply: 13.7mA
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Number Of Channels: 1
• Number Of Elements: 8
• Power Supply Requirement: Single
• Voltage Gain Db: 84dB
• Input Resistance: 0.0009@5VMohm
• Input Bias Current: 10@5VnA
• Single Supply Voltage (typ): 3/5V
• Dual Supply Voltage (typ): Not RequiredV
• Power Dissipation: 200mW
• Rail/rail I/o Type: Rail to Rail Output
• Single Supply Voltage (min): 2.7V
• Single Supply Voltage (max): 5.5V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: MSOP
• Lead Free Status / RoHS Status: Not Compliant

AD8313
Table 7. Evaluation Board Configuration Options
Component
VPS1, VPS2,
GND, VNEG
Z1
Z1
SW1
R7, R8
L/R, C1, C2, R9
R10, R12
R5, R6, C6
R1, R2, R3, R4,
C3, C4, C5, C7
INHI
INLO
Function
Supply Pins. VPS1 is the positive supply pin for the AD8313. VPS2 and VNEG are the
positive and negative supply pins for the AD8009. If the AD8009 is being operated
from a single supply, VNEG should be connected to GND. VPS1 and VPS2 are
independent. GND is shared by both devices.
AD8313 Logarithmic Amplifier. If the AD8313 is used in measurement mode, it is not
necessary to power up the AD8009 op amp. The log output can be measured at TP1 or
at the SMA connector labeled VSET.
AD8009 Operational Amplifier.
Device Enable. When in Position A, the PWDN pin is connected to ground and the
AD8313 is in normal operating mode. In Position B, the PWDN pin is connected to an
SMA connector labeled ENBL. A signal can be applied to this connector.
Slope Adjust. The slope of the AD8313 can be increased from its nominal value of
18 mV/dB to a maximum of 40 mV/dB by removing R11, the 0 Ω resistor, which shorts
VSET to VOUT, and installing a 0 Ω resistor at R7. The 20 kΩ potentiometer at R8 can
then be used to change the slope.
Operating in Controller Mode. To put the AD8313 into controller mode, R7 and R11
should be removed, breaking the link between VOUT and VSET. The VSET pin can then
be driven externally via the SMA connector labeled VSET.
Input Interface. The 52.3 Ω resistor in position L/R, along with C1 and C2, create a
wideband 50 Ω input. Alternatively, the 52.3 Ω resistor can be replaced by an inductor
to form an input matching network. See Input Coupling section for more details.
Remove the 0 Ω resistor at R9 for differential drive applications.
Op Amp Gain Adjust. The AD8009 is initially configured as a buffer; gain = 1. To increase
the gain of the op amp, modify the resistor values R10 and R12.
Op Amp Output Loading/Filtering. A variety of loading and filtering options are
available for the AD8009. The robust output of the op amp is capable of driving low
impedances such as 50 Ω or 75 Ω, configure R5 and R6 accordingly. See the AD8009
data sheet for more details.
Supply Decoupling.
V
V
PS1
PS1
10Ω
R1
10Ω
R9
0Ω
680pF
680pF
R2
C1
C2
10Ω
R2
C3
0.1µF
C4
0.1µF
L/R
53.6Ω
1
2
3
4
VPOS VOUT
INHI
INLO
VPOS PWDN
AD8313
Figure 44. Evaluation Board Schematic
Z1
COMM
VSET
Rev. D | Page 22 of 24
8
7
6
5
TP1
SW1
R11
0Ω
0.1µF
B
A
0.1µF
C7
C5
V
V
Z2
PS2
NEG
R4
0Ω
R3
0Ω
AD8009
301Ω
R12
20kΩ
R8
R10
OPEN
EXT ENABLE
R7
0Ω
R5
0Ω
R6
OPEN
C6
OPEN
Default
Not Applicable
Installed
Installed
SW1 = A
R7 = 0 Ω (Size 0603)
R8 = installed
L/R = 53.6 Ω (Size 0603)
C1 = C2 = 680 pF (Size 0603)
R9 = 0 Ω (Size 0603)
R10 = open (Size 0603)
R12 = 301 Ω (Size 0603)
R5 = 0 Ω (Size 0603)
R6 = open (Size 0603)
C6 = open (Size 0603)
R1 = R2 = 10 Ω (Size 0603)
R3 = R4 = 0 Ω (Size 0603)
C3 = C4 = 0.1 µF (Size 0603)
C5 = C7 = 0.1 µF (Size 0603)
VOUT
EXT VSET