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AD8318ACPZ-REEL7-AD8318ACPZ-WP
1 MHz to 8 GHz Logarithmic Detector / Controller
1 MHz – 8 GHz, 60 dB
Logarithmic Detector/Controller
Rev. 0
FEATURES
Wide bandwidth: 1 MHz to 8 GHz
High accuracy: ±1.0 dB over 55 dB range (f < 5.8 GHz)
Stability over temperature: ±0.5 dB
Low noise measurement/controller output VOUT
Pulse response time 10/12 ns (fall/rise)
Integrated temperature sensor
Small footprint CSP package
Power-down feature: <1.5 mW at 5 V
Single-supply operation: 5V @ 68 mA
Fabricated using high speed SiGe process
APPLICATIONS
RF transmitter PA setpoint control and level monitoring
RSSI measurement in base stations, WLAN, radar
GENERAL DESCRIPTION The AD8318 is a demodulating logarithmic amplifier, capable of
accurately converting an RF input signal to a corresponding
decibel-scaled output voltage. It employs the progressive
compression technique over a cascaded amplifier chain, each
stage of which is equipped with a detector cell. The device can be
used in measurement or controller mode. The AD8318
maintains accurate log conformance for signals of 1 MHz to
6 GHz and provides useful operation to 8 GHz. The input range
is typically 60 dB (re: 50 Ω) with error less than ±1 dB. The
AD8318 has a 10 ns response time that enables RF burst
detection to beyond 60 MHz. The device provides
unprecedented logarithmic intercept stability versus ambient
temperature conditions. A 2 mV/K slope temperature sensor
output is also provided for additional system monitoring. A
single supply of +5 V is required. Current consumption is
typically 68 mA. Power consumption decreases to <1.5 mW
when the device is disabled.
The AD8318 can be configured to provide a control voltage to a
VGA, such as a power amplifier or a measurement output, from
pin VOUT. Since the output can be used for controller
FUNCTIONAL BLOCK DIAGRAM
INHI
INLOVOUTVSET
CLPF
TEMP
VPSIENBLTADJVPSO
CMOPCMIPFigure 1.
applications, special attention has been paid to minimize
wideband noise. In this mode, the setpoint control voltage is
applied to VSET. The feedback loop through an RF
amplifier is closed via VOUT; the output of which regulates
the amplifier’s output to a magnitude corresponding to VSET.
The AD8318 provides 0 V to 4.9 V output capability at the
VOUT pin, suitable for controller applications. As a
measurement device, VOUT is externally connected to
VSET to produce an output voltage VOUT that is a decreasing
linear-in-dB function of the RF input signal amplitude.
The logarithmic slope is nominally −25 mV/dB, but can be
adjusted by scaling the feedback voltage from VOUT to the
VSET interface. The intercept is +20 dBm (re: 50 Ω, CW
input) using the INHI input. These parameters are very
stable against supply and temperature variations.
The AD8318 is fabricated on a SiGe bipolar IC process and
is available in a 4 mm × 4 mm, 16-pin LFCSP package, for
the operating temperature range of –40oC to +85oC.
TABLE OF CONTENTS Specifications...................................................................................3
Absolute Maximum Ratings..........................................................6
ESD Caution................................................................................6
Pin Configuration and Functional Descriptions........................7
Typical Performance Characteristics............................................8
General Description....................................................................11
Using the AD8318........................................................................12
Basic Connections...................................................................12
Enable........................................................................................12
Input Signal Coupling.............................................................12
Output Interface.......................................................................13
Setpoint Interface.....................................................................13
Temperature Compensation of Output Voltage..................13
Temperature Sensor.................................................................14
Measurement Mode.................................................................14
Device Calibration and Error Calculation............................15
Selecting Calibration Points to Improve Accuracy over a
Reduced Range.........................................................................16
Variation in Temperature Drift from Device to Device......17
Temperature Drift at Different Temperatures......................17
Setting the Output Slope in Measurement Mode................17
Response Time Capability......................................................18
Controller Mode.......................................................................18
Characterization Setups and Methods..................................20
Evaluation Board..........................................................................21
Outline Dimensions.....................................................................23
Ordering Guide........................................................................23
REVISION HISTORY
7/04—Revision 0: Initial Version
SPECIFICATIONS VP = 5 V, CLPF = 220 pF, TA = +25°C, 52.3 Ω termination resistor at INHI, unless otherwise noted.
Table 1. Controller mode (Gain = 1) For other gains, see Measurement Mode section of the data sheet.
