AD8364-EVAL Analog Devices, AD8364-EVAL Datasheet

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AD8364-EVAL

Manufacturer Part Number
AD8364-EVAL
Description
LF to 2.7GHz, Dual 60dB TruPwr Detector
Manufacturer
Analog Devices
Datasheet
PRELIMINARY TECHNICAL DATA
FEATURES
RMS Measurement of High Crest-Factor Signals
Dual Channel and Difference Outputs ports
Integrated accurately scaled Temperature Sensor
Wide Dynamic Range ±1 dB over 60 dB @2.2 GHz
±0.5 dB Temperature-Stable Linear-in-dB Response
Low log conformance ripple
+5V Operation at 70 mA, –40°C to +85°C
Small footprint 5x5 mm LFCSP Package
APPLICATIONS
Wireless Infrastructure Power Amplifier Linearization/Control
Antenna VSWR Monitor Devices
Gain Control and Measurement
Transmitter Signal Strength Indication (TSSI)
Dual-Channel Wireless Infrastructure Radios
GENERAL DESCRIPTION
The AD8364 is a true RMS responding dual channel RF power
measurement subsystem for the precise measurement and control
of signal power. The flexibility of the AD8364 allows
communications systems and instrumentation, such as RF power
amplifiers and radio transceiver AGC circuits, to be monitored and
controlled with ease. Operating on a single 5V supply, each
channel is fully specified for operation up to 2.7GHz, over a
dynamic range of 60dB. The AD8364 provides accurately scaled,
independent, RMS outputs of both RF measurement channels. A
useful measurement difference between the two channels is also
made available. On chip channel matching makes the RMS
difference output extremely stable with temperature and process
variations. The device also includes a useful temperature sensor
with an accurately scaled voltage proportional to temperature,
specified over the device operating temperature range. The
AD8364 can be used with input signals having RMS values from -
55dBm to +5dBm, Re: 50Ω and large crest factors with no accuracy
degradation.
Integrated in the AD8364 are two well-matched AD8362 channels
(see AD8362 data sheet for more info). Enhancements include
improved temperature performance and reduced log-conformance
ripple versus the AD8362. On chip wide bandwidth op-amps are
connected to accommodate flexible configurations that support
many system solutions.
Rev. PrC 1/20/2005
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
LF to 2.7GHz Dual 60dB TruPwr Detector
The device can easily be configured to provide three RMS
measurements simultaneously. Linear-in-dB RMS measurements are
supplied at OUTA and OUTB, with conveniently scaled slope of
50mV/dB. The RMS difference between OUTA and OUTB is
available differentially or single-ended at OUTP and OUTN. An
optional voltage applied to VLVL provides a common mode
reference level to offset OUTP and OUTN above ground.
Each channel of the AD8364 can independently be used to control
separate gain control feedback loops using VSTA and VSTB. The
difference outputs also provide feedback control while providing
improved temperature stability through matched channels.
Flexibility exists to use either channel as a reference while the other
channel is slaved through a feedback loop. RF power amplifier
control, VSWR measurements, and transceiver AGC circuits benefit
from this feature. In control modes, the opposite polarities of the
OUTP and OUTN outputs allow proportional or complementary
gain-control functions, eliminating the need for a board-level sign-
inverting amplifier. Feedback pins FBKA and FBKB allow custom
loop regulation in special control system applications and log-slope
adjust flexibility. When one channel is slaved off the other,
controlling the voltage at VLVL will adjust the slaved channel’s RMS
value, if a power level offset is desired.
The AD8364 is supplied in a 32-lead 5x5mm LFCSP package, for the
operating temperature of –40
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
PWDN
VPSA
COMR
VPSB
INHB
INHA
INLA
INLB
FUNCTIONAL BLOCK DIAGRAM
2
2
3
2
2
3
3
25
7
8
6
9
0
1
2
Figure 1. Functional Block Diagram
CHPB
CHPA
24
1
TruPwr™
TruPwr™
DECB
© 2005 Analog Devices, Inc. All rights reserved.
Channel B
DECA
Channel A
23
2
COMB ADJB ADJA VREF VLVL CLPB
COMA VPSR ACMB TEMP ACMA CLPA
22
3
o
OUTA
OUTB
C to +85
BIAS
21
4
20
5
V2I
TEMP
19
6
o
C.
18
7
V2I
17
8
www.analog.com
16
15
14
13
12
11
10
9
AD8364
VSTA
OUTA
FBKA
OUTP
OUTN
FBKB
OUTB
VSTB

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AD8364-EVAL Summary of contents

Page 1

... When one channel is slaved off the other, controlling the voltage at VLVL will adjust the slaved channel’s RMS value power level offset is desired. The AD8364 is supplied in a 32-lead 5x5mm LFCSP package, for the operating temperature of –40 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. ...

Page 2

... A INH[A,B] -40°C<T <85° -10dBm, -40dBm A INH[A,B] 5.5dB Peak-to-RMS Ratio (WCDMA 1 Channel) 12dB Peak-to-RMS Ratio (WCDMA 3 Channels) 18dB Peak-to-RMS Ratio (WCDMA 4 Channels) Rev. PrC Ι Page AD8364 = Chan B , VLVL = VREF, FREQ FREQ Min Typ Max Units LF 2 ...

Page 3

... OUTB = OUTB ± INHB PINHB ± -50dBm, OUTA = OUTA INHA PINHA INHA/INLA, INHB/INLB Differential Drive INHA/INLA, INHB/INLB Single-ended Drive With Recommended Balun Rev. PrC Ι Page AD8364 = Chan B , VLVL = VREF, FREQ FREQ Min Typ Max Units 30 dB ...

Page 4

... C, Balun = M/A-Com ETC 1.6-4-2-3 A Pins OUT[A, -40 C < T < + -40 C < T < + ±1dB Error ±1dB Error Rev. PrC Ι Page AD8364 = Chan B , VLVL = VREF, FREQ FREQ Min Typ Max Units dBm -62 dBm ...

Page 5

... C < T < + -40 C < T < + ±1dB Error ±1dB Error Pins OUT[A, -10dBm INH[A,B] Pins OUT[A, -40dBm INH[A,B] Rev. PrC Ι Page AD8364 = Chan B , VLVL = VREF, FREQ FREQ Min Typ Max Units 50 mV/dB -58 dBm TBD 2.3 TBD V TBD ...

Page 6

... INH[A,B] Pins OUT[A, -40dBm INH[A,B] Deviation from OUT[A,B] @ 25°C -40°C<T <85° -10dBm A INH[A,B] -40°C<T <85° -25dBm A INH[A,B] -40°C<T <85° -40dBm A INH[A,B] Rev. PrC Ι Page AD8364 = Chan B , VLVL = VREF, FREQ FREQ Min Typ Max Units +/- 0.5 dB +/- 0.5 dB +/- 0.5 dB +/- 0.3 dB +/- 0.3 dB +/- 0.3 ...

Page 7

... C L ≤ 300pF C L ≤ 100KHz CLPF = 1000pF, f SPOT OUTB=OUTA=open, OUTP=FBKA=open, VLVL=open Pin VLVL OUT[P,N]=FBK[A,B} (through Cap) OUT[P,N]=FBK[A,B} (through Cap) Rev. PrC Ι Page AD8364 = Chan B , VLVL = VREF, FREQ FREQ Min Typ Max Units +/- 0.3 dB +/- 0.3 dB +/- 0 ...

Page 8

... dBm LPA/B HPA/B PWDN HI to OUTA/OUTB at 10% final value, C =Open, C =10nF dBm LPA/B HPA/B Pin VPS[A,B], VPSR -55 dBm, Vs =5V PWDN enabled, Vs =5V Rev. PrC Ι Page AD8364 = Chan B , VLVL = VREF, FREQ FREQ Min Typ Max Units 0 2.5 V < ...

Page 9

... C. section of this specification is not implied. Exposure to absolute -40° +85° C maximum rating conditions for extended periods may affect -65° +150° C device reliability. +300° C Rev. PrC Ι Page AD8364 ...

Page 10

... Connect to common via a capacitor to determine 3 dB point of Channel A input signal high-pass filter. 26, 27 INHA, INLA Channel A “High” and “Low” RF signal input terminal. 28 PWDN Disable/Enable control input. Apply logic high voltage to shut AD8364 down. 30, 31 INLB, INHB Channel B “Low” and “High” RF signal input terminal. Under Exposed ...

Page 11

... Pin (dBm) and Log Conformance vs. Input Amplitude at 2.5 GHz, Typical OUT Device, T =1.14V , Sine Wave, Differential Drive ADJA/B 100 MHz 2700 MHz Figure 8. Differential Input Impedance (S11) vs. Frequency AD8364 2.5 2 1.5 1 0.5 0 -0.5 -1 -1.5 -2 -2.5 - 2.5 2 1 ...

Page 12

... A input swept, Typical Device, T ADJA -20 -15 - =0.75V, Sine Wave, Normalization vs. Input Amplitude for 10 Devices, Frequency=450 MHz, T ADJA/B Rev. PrC Ι Page AD8364 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15 Pin (dBm) and Log Conformance vs ...

Page 13

... Figure 19. V dB, and -1 dB and phase balance of 0 deg, ±5 deg, ±15 deg at 450 MHz, Typical Device, = 0.75V, Sine Wave, ADJA/B -20 -15 - 1.02V , Sine Wave, ADJA/B Rev. PrC Ι Page AD8364 2 1.5 1 0.5 0 -0.5 -1 -1.5 -2 -65 -60 -55 -50 -45 -40 -35 ...

Page 14

... Figure 25. Distribution of TEMP voltage for 40 Devices -10 -15 -20 -40 -30 -20 -10 0 Figure 26. Change in VREF vs. Temperature, 11 parts Rev. PrC Ι Page AD8364 TOTAL = 40 DEVICES RF INPUT = -60 dBm 2.494 2.496 2.498 2.5 2.502 2.504 2.506 VREF (VOLTS) 0.621 0.623 0.625 0.627 TEMP (VOLTS) 10 ...

Page 15

... CHANNEL VOUT CW ERROR -0.5 1 CHANNEL ERROR 3 CHANNEL ERROR -1 4 CHANNEL ERROR 11 CHANNEL ERROR -1 1 VOUT 0.5 1 CHANNEL VOUT 3 CHANNEL VOUT 0 4 CHANNEL VOUT CW ERROR -0.5 1 CHANNEL ERROR 3 CHANNEL ERROR -1 4 CHANNEL ERROR -1 Rev. PrC Ι Page AD8364 ...

Page 16

... COMB ADJB ADJA DECB Figure 29. Block Diagram A single channel of the AD8364 consists of a high performance AGC loop. Referring to figure 30, the AGC loop is comprised of a wide bandwidth variable gain amplifier (VGA), square law detectors, Amplitude Target circuit, and output driver. detailed description of the functional blocks, see AD8362 data sheet. ...

Page 17

... RMS value determined by VSTA or VSTB. RF Input interface The AD8364’s RF inputs are connected as shown in figure 31. There are 100Ω resistors connected between DEC[A,B] and INH[A,B] and INL[A,B]. The mid-point is wired to a pin called DEC[A,B]. Internally to the IC, the DC level on DEC[A,B] is established as (7*VPS[A,B] + 55*Vbe)/30 ...

Page 18

... PRELIMINARY TECHNICAL DATA OUT[A,B,P,N] Outputs The output drivers used in the AD8364 are different than the output stage on the AD8362. The AD8364 incorporates rail-to- rail output drivers with pull-up and pull-down capability. OUT[A,B,P,N] can source and sink up 70mA. There is also an internal load from both OUTA and OUTB to ACOM of 2.5KΩ. ...

Page 19

... Operation at high slopes is useful when a particular sub-range of the input is measured in greater detail. However, a measurement range would correspond change in VOUT at this slope, exceeding the capacity of the AD8364’s output stage when operating supply. This requires that the intercept is repositioned to place the desired sub-range within a window corresponding to an output range of 0.2 V ≤ ...

Page 20

... Figure 35. Scheme Providing 100 mV/dB Slope for Operation over 300 mV Input Range CHOOSING THE RIGHT VALUE FOR CHPF AND CLPF The AD8364’s variable gain amplifier includes an offset cancellation loop, which introduces a high-pass filter effect in its transfer function. The corner frequency, f ...

Page 21

... Table 5 Evaluation Board Configuration Options Component Function/Notes T1, T2 The dynamic range of the AD8364 is directly related to the magnitude and phase balance of the Balun feeding the RF signal to the part. The evaluation board includes M/A-COM MABAES0031 solderd to the board and two unsoldered M/A-COM ETC1.6-4-2-3. The MABAES0031 has good magnitude and phase balance between 10MHz and 500MHz, then slowly degrades above 500MHz ...

Page 22

... OUTB 10 R12 0 A VSTB 9 B R14 SW3 R13 open open VREF 7 8 C16 C17 R15 0.1uF 0 0.1uF C18 tbd A B REF LEVEL VOLTAGE J11 AD8364 SETPOINT VOLTAGE A J5 OUTPUT VOLTAGE A J6 DIFF OUT + J7 DIFF OUT - J8 OUTPUT VOLTAGE B J9 SETPOINT VOLTAGE B J10 ...

Page 23

... PRELIMINARY TECHNICAL DATA Figure 37. Package ORDERING GUIDE Model Temperature Range AD8364XCP −40°C to +85°C AD8364-EVAL Package Description 32-Lead LFCSP Evaluation Board Rev. PrC Ι Page AD8364 Package Option ...

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