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Details, datasheet, quote on part number:AD8361
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Datasheet text preview:
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FEATURES Calibrated RMS Response Excellent Temperature Stability Up to 30 dB Input Range at 2.5 GHz 700 mV rms, 10 dBm re 50 Maximum Input 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 A APPLICATIONS Measurement of CDMA, W-CDMA, QAM, Other Complex Modulation Waveforms RF Transmitter or Receiver Power Measurement
RFIN 2 TRANSCONDUCTANCE CELLS 2
LF to 2.5 GHz TruPwrTM Detector AD8361
FUNCTIONAL BLOCK DIAGRAMS micro_SOIC
VPOS INTERNAL FILTER FLTR
i
AD8361 i
ERROR AMP 7.5 BUFFER ADD OFFSET SREF COMM IREF
VRMS
PWDN
BAND-GAP REFERENCE
PRODUCT DESCRIPTION
SOT-23-6L
VPOS RFIN 2 TRANSCONDUCTANCE CELLS 2
The AD8361 is a mean-responding power detector for use in highfrequency 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 averaging time constant.
3.0 2.8 2.6 2.4 2.2 2.0
V rms Volts
i
INTERNAL FILTER FLTR
AD8361 i
ERROR AMP 7.5 BUFFER
VRMS
PWDN
BAND-GAP REFERENCE COMM
SUPPLY REFERENCE MODE
INTERNAL REFERENCE MODE
1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0 0.1 0.2 0.3 RFIN V rms 0.4 0.5 GROUND 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 VS/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 fT silicon bipolar process.
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.
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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
25 V = AD8361SPECIFICATIONS (oTthe=rwiseC,noted.)3 V, f
A S
RF
= 900 MHz, ground reference output mode, unless
Min Typ Max 2.5 Unit GHz mV rms dBm mV rms dBm pF V/V rms V/V rms dB dB dB dB dB dB dB dB dB dB V mV mV mV mV mV V V V µs µs µA V mA µA µA
Parameter SIGNAL INPUT INTERFACE Frequency Range1 Linear Response Upper Limit
Condition (Input RFIN) VS = 3 V Equivalent dBm re 50 VS = 5 V Equivalent dBm re 50 (Input RFIN to Output V rms)
Input Impedance2 RMS CONVERSION Conversion Gain Dynamic Range ± 0.25 dB Error4 ± 1 dB Error ± 2 dB Error Intercept-Induced Dynamic Range Reduction 5, 6 Deviation from CW Response
390 4.9 660 9.4 225 1 7.5
fRF = 100 MHz, VS = 5 V Error Referred to Best Fit Line 3 CW Input, 40°C < TA < +85°C CW Input, 40°C < TA < +85°C CW Input, 40°C < TA < +85°C CW Input, VS = 5 V, 40°C < TA < +85°C Internal Reference Mode Supply Reference Mode, VS = 3.0 V Supply Reference Mode, VS = 5.0 V 5.5 dB Peak-to-Average Ratio (IS95 Reverse Link) 12 dB Peak-to-Average Ratio (W-CDMA 4 Channels) 18 dB Peak-to-Average Ratio (W-CDMA 15 Channels) Inferred from Best Fit Line 3 0 V at SREF, VS at IREF fRF = 100 MHz, VS = 5 V 0 V at SREF, IREF Open fRF = 100 MHz, VS = 5 V 0 V at IREF, 3 V at SREF fRF = 100 MHz, VS = 5 V 0 V at IREF, VS at SREF 2.7 VS 5.5 V, 40°C < TA < +85°C 2.7 VS 5.5 V, 40°C < TA < +85°C 2 pF at FLTR Pin, 224 mV rms at RFIN 100 nF at FLTR Pin, 224 mV rms at RFIN
6.5 14 23 26 30 1 1 1.5 0.2 1.0 1.2 0 50 350 300 400 590 V S/ 7 . 5 VS 0.5
8.5
OUTPUT INTERCEPT5 Ground Reference Mode (GRM) Internal Reference Mode (IRM) Supply Reference Mode (SRM)
+150 500 750
POWER-DOWN INTERFACE PWDN HI Threshold PWDN LO Threshold Power-Up Response Time PWDN Bias Current POWER SUPPLIES Operating Range Quiescent Current Power-Down Current
0.1 5 320 <1 2.7 1.1 <1 10 × VS 5.5
40°C < TA < +85°C 0 mV rms at RFIN, PWDN Input LO 7 GRM or IRM, 0 mV rms at RFIN, PWDN Input HI SRM, 0 mV rms at RFIN, PWDN Input HI
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.
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AD8361
ABSOLUTE MAXIMUM RATINGS 1 PIN FUNCTION DESCRIPTIONS
Supply Voltage VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V SREF, PWDN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V, VS IREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VS 0.3 V, VS RFIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 V rms Equivalent Power re 50 . . . . . . . . . . . . . . . . . . . 13 dBm Internal Power Dissipation2 . . . . . . . . . . . . . . . . . . . . 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 permanent 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: JA = 230°C/W; JC = 92°C/W. micro_SOIC: JA = 200°C/W; JC = 44°C/W.
Pin Micro SOT Name 1 2 6 VPOS
Description
3
5
4
4
PIN CONFIGURATIONS micro_SOIC
VPOS 1 IREF 2 RFIN 3 PWDN 4 8 SREF 7 VRMS 6 FLTR 5 COMM
AD8361
5 6
2 3
7
SOT-23-6L
1
8
VRMS 1 COMM 2 FLTR 3
AD8361
6 5
VPOS RFIN
4 PWDN
Supply Voltage Pin. Operational range 2.7 V to 5.5 V. IREF Output Reference Control Pin. Internal reference mode enabled when pin is left open. Otherwise, this pin should be tied to VPOS. DO NOT ground this pin. RFIN Signal Input Pin. Must be driven from an ac-coupled source. The low frequency real input impedance is 225 . PWDN P o w e r - D o w n 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 VS 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 VS divided by 100 k). COMM Device Ground Pin. FLTR By placing a capacitor between this pin and VPOS, the corner frequency of the modulation filter is lowered. The onchip filter is formed with 27 pF 2 k for small input signals. VRMS Output Pin. Near-rail-to-rail voltage output with limited current drive capabilities. Expected load >10 k to ground. SREF Supply Reference Control Pin. To enable supply reference mode this pin must be connected to VPOS, otherwise it should be connected to COMM (ground).
ORDERING GUIDE
Model AD8361ARM* AD8361ARM-REEL AD8361ARM-REEL7 AD8361ART-REEL AD8361ART-REEL7 AD8361-EVAL AD8361ART-EVAL
*Device branded as J3A.
Temperature Range 40°C to +85°C
Package Description Tube, 8-Lead micro_SOIC 13" Tape and Reel 7" Tape and Reel 13" Tape and Reel 7" Tape and Reel Evaluation Board micro_SOIC Evaluation Board SOT-23-6L
Package Option RM-8
RT-6
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
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AD8361Typical Performance Characteristics
2.8 2.6 2.4 2.2 2.0
OUTPUT Volts
3.0
900MHz
2.5 2.0
100MHz
1900MHz
ERROR dB
1.5 1.0 0.5 0 0.5 1.0 1.5 2.0 2.5 MEAN 3 SIGMA
1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0 0.1 0.2 0.3 INPUT V rms 0.4 0.5 2.5GHz
3.0 0.01
0.02 (21dBm)
0.1 (7dBm) INPUT V rms
0.4 (+5dBm)
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 5.0 4.5 4.0
OUTPUT Volts
5.5V
3.0 2.5 2.0 5.0V 3.0V
ERROR dB
1.5 1.0 0.5 0 0.5 1.0 MEAN 1.5 2.0 2.5 3 SIGMA
3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 0.1 0.2 0.3 0.4 0.5 INPUT V rms 0.6 0.7 0.8 2.7V
3.0 0.01
0.02 (21dBm)
0.1 (7dBm) INPUT V rms
0.6 (+8.6dBm)
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
3.0 2.5 2.0 1.5 IS95 REVERSE LINK
5.0 4.5 4.0 3.5
OUTPUT Volts
IS95 REVERSE LINK
CW
1.0
ERROR dB
CW
3.0 2.5 2.0 1.5 1.0 WCDMA 4- AND 15-CHANNEL
0.5 0.0 0.5 1.0 1.5 2.0 15-CHANNEL 4-CHANNEL
0.5 0.0 0 0.1 0.2 0.3 0.4 0.5 INPUT V rms 0.6 0.7 0.8
2.5 3.0 0.01 0.02 0.1 INPUT V rms 0.2 0.6 1.0
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
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AD8361
3.0 2.5 2.0 1.5 1.0 0.5 0 0.5 1.0 MEAN 1.5 2.0 2.5 3.0 0.01 0.02 (21dBm) 0.1 (7dBm) INPUT V rms 0.4 (+5dBm) 3 SIGMA
ERROR dB ERROR dB
3.0 2.5 2.0 1.5 1.0 0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 0.01 0.02 (21dBm) 0.1 (7dBm) INPUT V rms 0.4 (+5dBm) 40 C +85 C
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 2.0
SUPPLY CURRENT mA
11 10 9 8 7 6 5 4 3 2 1 40 C 0 0.1 0.2 0.3 0.4 0.5 INPUT V rms 0.6 0.7 0.8 VS = 3V INPUT OUT OF RANGE +25 C +85 C VS = 5V INPUT OUT OF RANGE 40 C +25 C
1.5 1.0
ERROR dB
0.5 0 0.5 1.0 MEAN 1.5 2.0 2.5 3.0 0.01 0.02 (21dBm) 0.1 (7dBm) INPUT V rms 0.6 (+8.6dBm) 3 SIGMA
+85 C
0
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 2.0
250
+25 C
1.8 +85 C 1.6
SHUNT CAPACITANCE pF
200
1.5 1.0
ERROR dB
SHUNT RESISTANCE 1
+85 C
40 C 150
+85 C
1.4 1.2 1.0
0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 0.01 40 C
00
+25 C 40 C 0.8 0.6
50
0
0.02 (21dBm)
0.1 (7dBm) INPUT V rms
0.4 (+5dBm)
0
500
1500 1000 FREQUENCY MHz
2000
0.4 2500
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
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