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AD8363 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD8363
Beschreibung 50 dB TruPwr Detector
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 30 Seiten
AD8363 Datasheet, Funktion
Data Sheet
FEATURES
Accurate rms-to-dc conversion from 50 Hz to 6 GHz
Single-ended input dynamic range of >50 dB
No balun or external input tuning required
Waveform and modulation independent RF power detection
Linear-in-decibels output, scaled: 52 mV/dB
Log conformance error: <±0.15 dB
Temperature stability: <±0.5 dB
Voltage supply range: 4.5 V to 5.5 V
Operating temperature range: −40°C to +125°C
Power-down capability to 1.5 mW
Small footprint, 4 mm × 4 mm, LFCSP
APPLICATIONS
Power amplifier linearization/control loops
Multi-Standard, Multi-Carrier Wireless Infrastructure
(MCGSM, CDMA, WCDMA, TD-SCDMA, WiMAX, LTE)
Transmitter power control
Transmitter signal strength indication (TSSI)
RF instrumentation
GENERAL DESCRIPTION
The AD8363 is a true rms responding power detector that can
be directly driven with a single-ended 50 Ω source. This feature
makes the AD8363 frequency versatile by eliminating the need
for a balun or any other form of external input tuning for operation
up to 6 GHz.
The AD8363 provides an accurate power measurement,
independent of waveform, for a variety of high frequency
communication and instrumentation systems. Requiring only
a single supply of 5 V and a few capacitors, it is easy to use and
provides high measurement accuracy. The AD8363 can operate
from arbitrarily low frequencies to 6 GHz and can accept inputs
that have rms values from less than −50 dBm to at least 0 dBm,
with large crest factors exceeding the requirements for accurate
measurement of WiMAX, CDMA, W-CDMA, TD-SCDMA,
multicarrier GSM, and LTE signals.
The AD8363 can determine the true power of a high frequency
signal having a complex low frequency modulation envelope, or
it can be used as a simple low frequency rms voltmeter. The high-
pass corner generated by its internal offset-nulling loop can be
lowered by a capacitor added on the CHPF pin.
50 Hz to 6 GHz,
50 dB TruPwr™ Detector
AD8363
FUNCTIONAL BLOCK DIAGRAM
VTGT
12
VREF
11
VPOS
10
COMM
9
NC 13
AD8363
8 TEMP
INHI 14
INLO 15
X2
7 VSET
X2
6 VOUT
TCM1 16
5 CLPF
1
TCM2/PWDN
2
CHPF
3
VPOS
Figure 1. AD8363 Block Diagram
4
COMM
Used as a power measurement device, VOUT is connected to
VSET. The output is then proportional to the logarithm of the
rms value of the input. The reading is presented directly in
decibels and is conveniently scaled to 52 mV/dB, or approximately
1 V per decade; however, other slopes are easily arranged. In
controller mode, the voltage applied to VSET determines the
power level required at the input to null the deviation from the
setpoint. The output buffer can provide high load currents.
The AD8363 has 1.5 mW power consumption when powered
down by a logic high applied to the TCM2/PWDN pin. It powers
up within about 30 μs to its nominal operating current of 60 mA at
25°C. The AD8363 is available in a 4 mm × 4 mm 16-lead LFCSP
for operation over the −40°C to +125°C temperature range.
A fully populated RoHS compliant evaluation board is also
available.
Rev. B
Document Feedback
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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Tel: 781.329.4700 ©2009–2015 Analog Devices, Inc. All rights reserved.
Technical Support
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AD8363 Datasheet, Funktion
Data Sheet
AD8363
Parameter
Logarithmic Slope
Logarithmic Intercept
Deviation from CW Response
Input Impedance
3.8 GHz
Output Voltage: High Power In
Output Voltage: Low Power In
±1.0 dB Dynamic Range
Maximum Input Level, ±1.0 dB
Minimum Input Level, ±1.0 dB
Deviation vs. Temperature
Logarithmic Slope
Logarithmic Intercept
Deviation from CW Response
Input Impedance
5.8 GHz
Output Voltage: High Power In
Output Voltage: Low Power In
±1.0 dB Dynamic Range
Maximum Input Level, ±1.0 dB
Minimum Input Level, ±1.0 dB
Deviation vs. Temperature
Logarithmic Slope
Logarithmic Intercept
Deviation from CW Response
Input Impedance
OUTPUT INTERFACE
Output Swing, Controller Mode
Current Source/Sink Capability
Voltage Regulation
Rise Time
Conditions
13 dB peak-to-rms ratio (W-CDMA), over 32 dB dynamic range
12 dB peak-to-rms ratio (WiMAX), over 32 dB dynamic range
14.0 dB peak-to-rms ratio (16C CDMA2K), over 32 dB dynamic
range
256 QAM, CF = 8 dB, over 32 dB dynamic range
Single-ended drive
TCM1 (Pin 16) = 0.56 V, TCM2 (Pin 1) = 1.0 V, INLO input
PIN = −20 dBm
PIN = −40 dBm
CW input, TA = 25°C
3-point calibration at 0 dBm, −10 dBm and −40 dBm
Best-fit (linear regression) at −20 dBm and −40 dBm
Deviation from output at 25°C
−40°C < TA < +85°C; PIN = −20 dBm
−40°C < TA < +85°C; PIN = −40 dBm
13 dB peak-to-rms ratio (W-CDMA), over 32 dB dynamic range
12 dB peak-to-rms ratio (WiMAX), over 32 dB dynamic range
14.0 dB peak-to-rms ratio (16C CDMA2K), over 32 dB dynamic
range
256 QAM, CF = 8 dB, over 32 dB dynamic range
Single-ended drive
TCM1 (Pin 16) = 0.88 V, TCM2 (Pin 1) = 1.0 V, INLO input
PIN = −20 dBm
PIN = −40 dBm
CW input, TA = 25°C
3-point calibration at 0 dBm, −10 dBm and −40 dBm
Best-fit (linear regression) at −20 dBm and −40 dBm
Deviation from output at 25°C
−40°C < TA < +85°C; PIN = −20 dBm
−40°C < TA < +85°C; PIN = −40 dBm
13 dB peak-to-rms ratio (W-CDMA), over 32 dB dynamic range
12 dB peak-to-rms ratio (WiMAX), over 32 dB dynamic range
14.0 dB peak-to-rms ratio (16C CDMA2K), over 32 dB dynamic
range
256 QAM, CF = 8 dB, over 32 dB dynamic range
Single-ended drive
VOUT (Pin 6)
Swing range minimum, RL ≥ 500 Ω to ground
Swing range maximum, RL ≥ 500 Ω to ground
Output held at VPOS/2
ILOAD = 8 mA, source/sink
Transition from no input to 1 dB settling at RFIN = −10 dBm,
CLPF = 390 pF, CHPF = open
Min
Typ
52.9
−49
±0.1
±0.1
±0.1
±0.1
95 − j65
Max
1.54
0.54
50
43
−5
−48
+0.1/−0.7
+0.4/−0.5
50.0
−51
±0.1
±0.1
±0.1
±0.1
42 − j4.5
1.38
0.36
50
45
−3
−48
+0.1/−0.6
+0.3/−0.8
51.1
−47
±0.1
±0.1
±0.1
±0.1
28 + j1.6
0.03
4.8
−0.2/+0.1
3
10/10
Unit
mV/dB
dBm
dB
dB
dB
dB
V
V
dB
dB
dBm
dBm
dB
dB
mV/dB
dBm
dB
dB
dB
dB
V
V
dB
dB
dBm
dBm
dB
dB
mV/dB
dBm
dB
dB
dB
dB
V
V
mA
%
µs
Rev. B | Page 5 of 29

6 Page









AD8363 pdf, datenblatt
Data Sheet
3.00 6
2.75 5
2.50 4
2.25 3
2.00 2
1.75 1
1.50 0
1.25 –1
1.00 –2
0.75 –3
0.50 –4
0.25 –5
0
–60 –50 –40 –30 –20 –10
0
–6
10
PIN (dBm)
Figure 15. VOUT and Log Conformance Error with Respect to 25°C Ideal Line
over Temperature vs. Input Amplitude at 5.8 GHz, Typical Device
3
ERROR CW
ERROR W-CDMA 1 CAR TM1 64 DPCH
2 ERROR W-CDMA 2 CAR TM1 64 DPCH
ERROR W-CDMA 3 CAR TM1 64 DPCH
ERROR W-CDMA 4 CAR TM1 64 DPCH
1
0
–1
–2
–3
–60
–50 –40
–30 –20
PIN (dBm)
–10
0
10
Figure 16. Error from CW Linear Reference vs. Input Amplitude with
Modulation, Frequency at 2.14 GHz, CLPF = 0.1 μF, INHI Input
100MHz
900MHz 1.9GHz
5.8GHz
3.8GHz
2.14GHz
2.6GHz
Figure 17. Single-Ended Input Impedance (S11) vs.
Frequency; ZO = 50 Ω, INHI or INLO
AD8363
3.00 6
2.75 5
2.50 4
2.25 3
2.00 2
1.75 1
1.50 0
1.25 –1
1.00 –2
0.75 –3
0.50 –4
0.25 –5
0
–60 –50 –40 –30 –20 –10
PIN (dBm)
0
–6
10
Figure 18. Distribution of VOUT and Error with Respect to 25°C Ideal Line
over Temperature vs. Input Amplitude at 5.8 GHz, CW
3
2
1
0
–1 CW
W-CDMA 1 CAR TM1 32 DPCH
QPSK
–2 256QAM
WIMAX 256 SUBCR, 64 QAM, 10MHz BW
CDMA2K 9 CH SR1 4 CAR
–3
–60 –50 –40 –30 –20 –10
0
10
PIN (dBm)
Figure 19. Error from CW Linear Reference vs. Input Amplitude with
Modulation, Frequency at 2.6 GHz, CLPF = 0.1 μF, INHI Input
160
140
120
100
80
60
40
20
0
100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
Figure 20. Typical Noise Spectral Density of VOUT; All CLPF Values
Rev. B | Page 11 of 29

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