AD8361 b

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a
LF to 2.5 GHz
TruPwr
™
Detector
AD8361
FEATURES
Calibrated RMS Response
Excellent Temperature Stability
Up to 30 dB Input Range at 2.5 GHz
700 mV rms, 10 dBm re 50
FUNCTIONAL BLOCK DIAGRAMS
micro_SOIC
Maximum Input
VPOS
i
INTERNAL FILTER
0.25 dB Linear Response Up to 2.5 GHz
Single Supply Operation: 2.7 V to 5.5 V
Low Power: 3.3 mW at 3 V Supply
Rapid Power-Down to Less than 1
RFIN
2
FLTR
TRANS-
CONDUCTANCE
CELLS
AD8361
ERROR
AMP
A
i
2
7.5
BUFFER
VRMS
APPLICATIONS
Measurement of CDMA, W-CDMA, QAM, Other
Complex Modulation Waveforms
RF Transmitter or Receiver Power Measurement
BAND-GAP
REFERENCE
ADD
OFFSET
PWDN
SREF
COMM
IREF
SOT-23-6L
PRODUCT DESCRIPTION
The AD8361 is a mean-responding power detector for use in high-
frequency receiver and transmitter signal chains, up to 2.5 GHz.
It is very easy to apply. It requires only a single supply between
2.7 V and 5.5 V, power supply decoupling capacitor and an
input coupling capacitor in most applications. The output is a
linear-responding dc voltage with a conversion gain of 7.5 V/V rms.
An external filter capacitor can be added to increase the averag-
ing time constant.
VPOS
i
INTERNAL FILTER
RFIN
2
FLTR
TRANS-
CONDUCTANCE
CELLS
AD8361
ERROR
AMP
2
i
7.5
BUFFER
VRMS
BAND-GAP
REFERENCE
PWDN
3.0
2.8
SUPPLY
REFERENCE MODE
COMM
2.6
2.4
2.2
2.0
1.8
INTERNAL
REFERENCE MODE
The AD8361 is intended for true power measurement of simple
and complex waveforms. The device is particularly useful for
measuring high crest-factor (high peak-to-rms ratio) signals, such
as CDMA and W-CDMA.
The AD8361 has three operating modes to accommodate a
variety of analog-to-digital converter requirements:
1. Ground referenced mode, in which the origin is zero;
2. Internal reference mode, which offsets the output 350 mV
above ground;
3. Supply reference mode, which offsets the output to V
S
/7.5.
The AD8361 is specified for operation from –40°C to +85°C and
is available in 8-lead micro_SOIC and 6-lead SOT packages.
It is fabricated on a proprietary high f
T
silicon bipolar process.
1.6
1.4
1.2
1.0
GROUND
REFERENCE MODE
0.8
0.6
0.4
0.2
0.0
0
0.1
0.2
0.3
0.4
0.5
RFIN – V rms
Figure 1. Output in the Three Reference Modes, Supply 3 V,
Frequency 1.9 GHz (SOT-23-6L Package Ground Reference
Mode Only)
TruPwr is a trademark of Analog Devices, Inc.
REV. B
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
AD8361–SPECIFICATIONS
(T
A
= 25
C, V
S
= 3 V, f
RF
= 900 MHz, ground reference output mode, unless
otherwise noted.)
Parameter
Condition
Min
Typ
Max
Unit
SIGNAL INPUT INTERFACE
(Input RFIN)
Frequency Range
1
2.5
GHz
Linear Response Upper Limit
V
S
= 3 V
390
mV rms
Equivalent dBm re 50 Ω
4.9
dBm
V
S
= 5 V
660
mV rms
Equivalent dBm re 50 Ω
9.4
dBm
Input Impedance
2
225
1
Ω
pF
RMS CONVERSION
(Input RFIN to Output V rms)
Conversion Gain
7.5
V/V rms
f
RF
= 100 MHz, V
S
= 5 V
6.5
8.5
V/V rms
Dynamic Range
Error Referred to Best Fit Line
3
±0.25 dB Error
4
CW Input, –40°C < T
A
< +85°C
14
dB
±1 dB Error
CW Input, –40°C < T
A
< +85°C
23
dB
±2 dB Error
CW Input, –40°C < T
A
< +85°C
26
dB
CW Input, V
S
= 5 V, –40°C < T
A
< +85°C
30
dB
Intercept-Induced Dynamic
Internal Reference Mode
1
dB
Range Reduction
5, 6
Supply Reference Mode, V
S
= 3.0 V
1
dB
Supply Reference Mode, V
S
= 5.0 V
1.5
dB
Deviation from CW Response
5.5 dB Peak-to-Average Ratio (IS95 Reverse Link)
0.2
dB
12 dB Peak-to-Average Ratio (W-CDMA 4 Channels)
1.0
dB
18 dB Peak-to-Average Ratio (W-CDMA 15 Channels)
1.2
dB
OUTPUT INTERCEPT
5
Inferred from Best Fit Line
3
Ground Reference Mode (GRM)
0 V at SREF, V
S
at IREF
0
V
f
RF
= 100 MHz, V
S
= 5 V
–50
+150
mV
Internal Reference Mode (IRM)
0 V at SREF, IREF Open
350
mV
f
RF
= 100 MHz, V
S
= 5 V
300
500
mV
Supply Reference Mode (SRM)
0 V at IREF, 3 V at SREF
400
mV
f
RF
= 100 MHz, V
S
= 5 V
590
750
mV
0 V at IREF, V
S
at SREF
V
S
/7.5
V
POWER-DOWN INTERFACE
PWDN HI Threshold
2.7
≤
V
S
≤
5.5 V, –40°C < T
A
< +85°C
V
S
– 0.5
V
PWDN LO Threshold
2.7
≤
V
S
≤
5.5 V, –40°C < T
A
< +85°C
0.1
V
Power-Up Response Time
2 pF at FLTR Pin, 224 mV rms at RFIN
5
µs
100 nF at FLTR Pin, 224 mV rms at RFIN
320
µs
PWDN Bias Current
<1
µA
POWER SUPPLIES
Operating Range
–40°C < T
A
< +85°C
2.7
5.5
V
Quiescent Current
0 mV rms at RFIN, PWDN Input LO
7
1.1
mA
Power-Down Current
GRM or IRM, 0 mV rms at RFIN, PWDN Input HI
<1
µA
SRM, 0 mV rms at RFIN, PWDN Input HI
10 × V
S
µA
NOTES
1
Operation at arbitrarily low frequencies is possible; see Applications section.
2
TPC 12 and Figure 10 show impedance versus frequency for the micro_SOIC and SOT respectively.
3
Calculated using linear regression.
4
Compensated for output reference temperature drift; see Applications section.
5
SOT-23-6L operates in ground reference mode only.
6
The available output swing, and hence the dynamic range, is altered by both supply voltage and reference mode; see Figures 5 and 6.
7
Supply current is input level dependant; see TPC 11.
Specifications subject to change without notice.
–2–
REV. B
AD8361
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage V
S
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
SREF, PWDN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V, V
S
IREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
S
– 0.3 V, V
S
RFIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 V rms
Equivalent Power re 50 Ω . . . . . . . . . . . . . . . . . . . 13 dBm
Internal Power Dissipation
2
. . . . . . . . . . . . . . . . . . . . 200 mW
SOT-23-6L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170 mW
micro_SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mW
Maximum Junction Temperature . . . . . . . . . . . . . . . . . 125°C
Operating Temperature Range . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . –65°C to +150°C
Lead Temperature Range (Soldering 60 sec) . . . . . . . . . 300°C
NOTES
1
Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
2
Specification is for the device in free air.
SOT-23-6L:
PIN FUNCTION DESCRIPTIONS
Pin
Micro SOT Name Description
1
6
VPOS Supply Voltage Pin. Operational range
2.7 V to 5.5 V.
2
IREF
Output Reference Control Pin. Inter-
nal reference mode enabled when pin
is left open. Otherwise, this pin should
be tied to VPOS. DO NOT ground
this pin.
3
5
RFIN
Signal Input Pin. Must be driven from
an ac-coupled source. The low frequency
real input impedance is 225 Ω.
4
4
PWDN Power-Down Pin. For the device to
operate as a detector it needs a logical
low input (less than 100 mV). When
a logic high (greater than V
S
– 0.5 V)
is applied, the device is turned off and
the supply current goes to nearly zero
(ground and internal reference mode
less than 1 µA, supply reference mode
V
S
divided by 100 kΩ).
θ
JA
= 230
°
C/W;
θ
JC
= 92
°
C/W.
micro_SOIC:
θ
JA
= 200
°
C/W;
θ
JC
= 44
C/W.
PIN CONFIGURATIONS
micro_SOIC
5
2
COMM Device Ground Pin.
VPOS
1
AD8361
8
SREF
6
3
FLTR By placing a capacitor between this pin
and VPOS, the corner frequency of the
modulation filter is lowered. The on-
chip filter is formed with 27 pF
2 kΩ
for small input signals.
IREF
2
7
VRMS
RFIN
3
6
FLTR
PWDN
4
5
COMM
7
1
VRMS Output Pin. Near-rail-to-rail voltage
output with limited current drive capa-
bilities. Expected load >10 kΩ to ground.
SOT-23-6L
8
SREF
Supply Reference Control Pin. To
enable supply reference mode this pin
must be connected to VPOS, other-
wise it should be connected to COMM
(ground).
VRMS
1
AD8361
6
VPOS
COMM
2
5
RFIN
FLTR
3
4
PWDN
ORDERING GUIDE
Model
Temperature Range
Package Description
Package Option
AD8361ARM
*
–40°C to +85°C
Tube, 8-Lead micro_SOIC
RM-8
AD8361ARM-REEL
13" Tape and Reel
AD8361ARM-REEL7
13" Tape and Reel
RT-6
AD8361ART-REEL7
7" Tape and Reel
AD8361ART-EVAL
Evaluation Board micro_SOIC
*
Device branded as J3A.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the AD8361 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. B
–3–
°
AD8361ART-REEL
7" Tape and Reel
AD8361-EVAL
Evaluation Board SOT-23-6L
AD8361
–Typical Performance Characteristics
2.8
2.6
900MHz
3.0
2.5
2.4
2.2
2.0
100MHz
1.5
1900MHz
2.0
1.0
1.8
1.6
2.5GHz
0.5
1.4
1.2
1.0
0
–0.5
–1.0
0.8
MEAN
3 SIGMA
–1.5
–2.0
–2.5
–3.0
0.6
0.4
0.2
0.0
0
0.1
0.2
0.3
0.4
0.5
0.01
0.02
(–21dBm)
0.1
(–7dBm)
0.4
(+5dBm)
INPUT – V rms
INPUT – V rms
TPC 1. Output vs. Input Level, Frequencies 100 MHz,
900 MHz, 1900 MHz, and 2500 MHz, Supply 2.7 V, Ground
Reference Mode, micro_SOIC
TPC 4. Error from Linear Reference vs. Input Level,
3 Sigma to Either Side of Mean, Sine Wave, Supply 3.0 V,
Frequency 900 MHz
5.5
5.5V
3.0
2.5
5.0
4.5
2.0
5.0V
1.5
4.0
3.5
3.0V
1.0
3.0
2.5
0.5
0
–0.5
2.0
2.7V
–1.0
MEAN
3 SIGMA
1.5
–1.5
–2.0
–2.5
–3.0
1.0
0.5
0.0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.01
0.02
(–21dBm)
0.1
(–7dBm)
0.6
(+8.6dBm)
INPUT – V rms
INPUT – V rms
TPC 2. Output vs. Input Level, Supply 2.7 V, 3.0 V, 5.0 V,
and 5.5 V, Frequency 900 MHz
TPC 5. Error from Linear Reference vs. Input Level,
3 Sigma to Either Side of Mean, Sine-Wave, Supply 5.0 V,
Frequency 900 MHz
5.0
CW
3.0
2.5
IS95
REVERSE LINK
4.5
4.0
2.0
1.5
3.5
1.0
CW
IS95
REVERSE LINK
3.0
0.5
2.5
0.0
–0.5
2.0
WCDMA
4- AND 15-CHANNEL
4-CHANNEL
1.5
–1.0
1.0
–1.5
–2.0
–2.5
–3.0
15-CHANNEL
0.5
0.0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.01
0.02
0.1
0.2
0.6
1.0
INPUT – V rms
INPUT – V rms
TPC 3. Output vs. Input Level with Different Waveforms
Sine Wave (CW), IS95 Reverse Link, W-CDMA 4-Channel
and W-CDMA 15-Channel, Supply 5.0 V
TPC 6. Error from CW Linear Reference vs. Input with
Different Waveforms Sine Wave (CW), IS95 Reverse Link,
W-CDMA 4-Channel and W-CDMA 15-Channel, Supply
3.0 V, Frequency 900 MHz
–4–
REV. B
AD8361
3.0
2.5
3.0
2.5
2.0
2.0
1.5
1.5
+85
C
1.0
1.0
0.5
0.5
0
–0.5
0
–0.5
–1.0
–1.0
MEAN
3 SIGMA
–40
C
–1.5
–2.0
–2.5
–3.0
–1.5
–2.0
–2.5
–3.0
0.01
0.02
(–21dBm)
0.1
(–7dBm)
0.4
(+5dBm)
0.01
0.02
(–21dBm)
0.1
(–7dBm)
0.4
(+5dBm)
INPUT – V rms
INPUT – V rms
TPC 7. Error from CW Linear Reference vs. Input,
3 Sigma to Either Side of Mean, IS95 Reverse Link Signal,
Supply 3.0 V, Frequency 900 MHz
TPC 10. Output Delta from +25
°
C vs. Input Level,
3 Sigma to Either Side of Mean Sine Wave, Supply 3.0 V,
Frequency 1900 MHz, Temperature –40
°
C to +85
°
C
3.0
2.5
11
10
V
S
= 5V
INPUT OUT
OF RANGE
2.0
9
1.5
8
–40
C +25
C
1.0
7
V
S
= 3V
INPUT OUT
OF RANGE
0.5
6
5
4
0
–0.5
+85
C
+25
C
–1.0
–1.5
–2.0
–2.5
–3.0
MEAN
3 SIGMA
3
+85
C
2
1
0
–40
C
0.01
0.02
(–21dBm)
0.1
(–7dBm)
0.6
(+8.6dBm)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
INPUT – V rms
INPUT – V rms
TPC 8. Error from CW Linear Reference vs. Input Level, 3
Sigma to Either Side of Mean, IS95 Reverse Link Signal,
Supply 5.0 V, Frequency 900 MHz
TPC 11. Supply Current vs. Input Level, Supplies 3.0 V,
and 5.0 V, Temperatures –40
°
C, +25
°
C, and +85
°
C
3.0
2.5
250
C
1.8
+25
+85
C
2.0
1.6
200
1.5
+85
C
–40
C
1.4
1.0
+85
C
0.5
150
1.2
0
–0.5
100
1.0
–1.0
+25
C
–1.5
–2.0
–2.5
–3.0
–40
C
–40
C
0.8
50
0.6
0
0.4
0.01
0.02
(–21dBm)
0.1
(–7dBm)
0.4
(+5dBm)
0
500
1000
1500
2000
2500
FREQUENCY – MHz
INPUT – V rms
TPC 9. Output Delta from +25
°
C vs. Input Level,
3 Sigma to Either Side of Mean Sine Wave, Supply 3.0 V,
Frequency 900 MHz, Temperature –40
°
C to +85
°
C
TPC 12. Input Impedance vs. Frequency, Supply 3 V,
Temperatures –40
°
C, +25
°
C, and +85
°
C, micro_SOIC (See
Applications for SOT-23-6L Data)
REV. B
–5–
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