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Details, datasheet, quote on part number:AD8313A
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Datasheet text preview:
a
FEATURES Wide Bandwidth: 0.1 GHz to 2.5 GHz Min High Dynamic Range: 70 dB to 3.0 dB High Accuracy: 1.0 dB over 65 dB Range (@ 1.9 GHz) Fast Response: 40 ns Full-Scale Typical Controller Mode with Error Output Scaling Stable Over Supply and Temperature Wide Supply Range: +2.7 V to +5.5 V Low Power: 40 mW at 3 V Power-Down Feature: 60 W at 3 V Complete and Easy to Use APPLICATIONS RF Transmitter Power Amplifier Setpoint Control and Level Monitoring Logarithmic Amplifier for RSSI Measurement Cellular Base Stations, Radio Link, Radar PRODUCT DESCRIPTION
0.1 GHz2.5 GHz, 70 dB Logarithmic Detector/Controller AD8313
FUNCTIONAL BLOCK DIAGRAM
NINE DETECTOR CELLS + + + VPOS CINT INHI 8dB INLO EIGHT 8dB 3.5GHz AMPLIFIER STAGES INTERCEPT CONTROL COMM 8dB 8dB 8dB LP VvI VSET + + IvV VOUT
AD8313
VPOS SLOPE CONTROL BAND-GAP REFERENCE
GAIN BIAS
PWDN
The AD8313 uses a cascade of eight amplifier/limiter cells, each having a nominal gain of 8 dB and a 3 dB bandwidth of 3.5 GHz, for a total midband gain of 64 dB. At each amplifier output, a detector (rectifier) cell is used to convert the RF signal to baseband form; a ninth detector cell is placed directly at the input of the AD8313. The current-mode outputs of these cells are summed to generate a piecewise linear approximation to the logarithmic function, and converted to a low impedance voltagemode output by a transresistance stage, which also acts as a lowpass filter.
OUTPUT VOLTAGE Volts DC
The AD8313 is a complete multistage demodulating logarithmic amplifier, capable of accurately converting an RF signal at its differential input to an equivalent decibel-scaled value at its dc output. The AD8313 maintains a high degree of log conformance for signal frequencies from 0.1 GHz to 2.5 GHz and is useful over the range of 10 MHz to 3.5 GHz. The nominal input dynamic range is 65 dBm to 0 dBm (re: 50 ), and the sensitivity can be increased by 6 dB or more with a narrow band input impedance matching network or balun. Application is straightforward, requiring only a single supply of 2.7 V5.5 V and the addition of a suitable input and supply decoupling. Operating on a 3 V supply, its 13.7 mA consumption (for TA = +25°C) amounts to only 41 mW. A power-down feature is provided; the input is taken high to initiate a low current (20 µA) sleep mode, with a threshold at half the supply voltage.
When used as a log amp, the scaling is determined by a separate feedback interface (a transconductance stage) that sets the slope to approximately 18 mV/dB; used as a controller, this stage accepts the setpoint input. The logarithmic intercept is positioned to nearly 100 dBm, and the output runs from about 0.45 V dc at 73 dBm input to 1.75 V dc at 0 dBm input. The scale and intercept are supply and temperature stable. The AD8313 is fabricated on Analog Devices' advanced 25 GHz silicon bipolar IC process and is available in a 8-lead µSOIC package. The operating temperature range is 40°C to +85°C. An evaluation board is available.
2.0 FREQUENCY = 1.9GHz 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 80 70 60 50 40 30 INPUT AMPLITUDE dBm 20 10 0 4 3 2 1 0 1 2 3 4 5 5
Figure 1. Typical Logarithmic Response and Error vs. Input Amplitude
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., 1999
OUTPUT ERROR dB
AD8313SPECIFICATIONS (@ T = +25 C, V = +5.0 V , R 10 k
A S 1 L
unless otherwise noted)
2
Parameter SIGNAL INPUT INTERFACE Specified Frequency Range DC Common-Mode Voltage Input Bias Currents Input Impedance LOG (RSSI) MODE 100 MHz5 ± 3 dB Dynamic Range6 Range Center ± 1 dB Dynamic Range Slope Intercept ± 3 dB Dynamic Range Range Center ± 1 dB Dynamic Range Slope Intercept Temperature Sensitivity 900 MHz5 ± 3 dB Dynamic Range Range Center ± 1 dB Dynamic Range Slope Intercept ± 3 dB Dynamic Range Range Center ± 1 dB Dynamic Range Slope Intercept Temperature Sensitivity 1.9 GHz ± 3 dB Dynamic Range Range Center ± 1 dB Dynamic Range Slope Intercept ± 3 dB Dynamic Range Range Center ± 1 dB Dynamic Range Slope Intercept Temperature Sensitivity 2.5 GHz ± 3 dB Dynamic Range Range Center ± 1 dB Dynamic Range Slope Intercept ± 3 dB Dynamic Range Range Center ± 1 dB Dynamic Range Slope Intercept Temperature Sensitivity
7 7
Conditions
Min 0.1
Typ
Max2 2.5
Units GHz V µA pF4
fRF < 100 MHz3
VPOS 0.75 10 900 1.1
Sinusoidal, input termination configuration shown in Figure 27. Nominal Conditions 53.5 65 31.5 56 17 19 96 88 +2.7 V VS +5.5 V, 40°C T +85°C 51 64 31 55 16 19 99 89 PIN = 10 dBm 0.022 Nominal Conditions 60 69 32.5 62 18 93 68.5 32.75 61 18 95 0.019 73 36.5 62 17.5 100 73 36.5 60 17.5 101 0.019 66 34 46 20 92 68 34.5 46 20 92 0.040
21 80
dB dBm dB mV/dB dBm dB dBm dB mV/dB dBm d B /° C dB dBm dB mV/dB dBm dB dBm dB mV/dB dBm d B /° C dB dBm dB mV/dB dBm dB dBm dB mV/dB dBm d B /° C dB dBm dB mV/dB dBm dB dBm dB mV/dB dBm d B /° C REV. B
22 75
+2.7 V VS +5.5 V, 40°C T +85°C
15.5 105 55.5
20.5 81
15 110 PIN = 10 dBm Nominal Conditions 52
21 80
+2.7 V VS +5.5 V, 40°C T +85°C
15 115 50
20.5 85
14 125 PIN = 10 dBm Nominal Conditions 48
21.5 78
+2.7 V VS +5.5 V, 40°C T +85°C
16 111 47
25 72
14.5 128 PIN = 10 dBm 2
25 56
AD8313
Parameter 3.5 GHz ± 3 dB Dynamic Range ± 1 dB Dynamic Range Slope Intercept CONTROL MODE Controller Sensitivity Low Frequency Gain Open-Loop Corner Frequency Open-Loop Slew Rate VSET Delay Time VOUT INTERFACE Current Drive Capability Source Current Sink Current Minimum Output Voltage Maximum Output Voltage Output Noise Spectral Density Small Signal Response Time Large Signal Response Time VSET INTERFACE Input Voltage Range Input Impedance POWER-DOWN INTERFACE PWDN Threshold Power-Up Response Time PWDN Input Bias Current POWER SUPPLY Operating Range Powered Up Current f = 900 MHz VSET to VOUT8 VSET to VOUT8 f = 900 MHz
5
Conditions
Min
2
Typ 43 35 24 65 23 84 700 2.5 150
Max
2
Units dB dB mV/dB dBm V/dB dB Hz V/µs ns
Open Loop Open Loop PIN = 60 dBm, fSPOT = 100 Hz PIN = 60 dBm, fSPOT = 10 MHz PIN = 60 dBm to 57 dBm, 10% to 90% PIN = No Signal to 0 dBm, Settled to 0.5 dB 0
400 10 50 VPOS 0.1 2.0 1.3 40 110
60 160 VPOS
µA mA mV V µV/Hz µV/Hz ns ns V pF V µs µA µA
18k 1 VPOS/2 Time delay following HI to LO transition until device meets full specifications. PWDN = 0 V PWDN = VS +2.7 +4.5 V VS +5.5 V, 40°C T +85°C +2.7 V VS +3.3 V, 40°C T +85°C +4.5 V VS +5.5 V, 40°C T +85°C +2.7 V VS +3.3 V, 40°C T +85°C 13.7 1.8 5 <1
Powered Down Current
50 20
+5.5 15.5 18.5 18.5 150 50
V mA mA mA µA µA
NOTES 1 Except where otherwise noted, performance at V S = +3.0 V is equivalent to +5.0 V operation. 2 Minimum and maximum specified limits on parameters that are guaranteed but not tested are six sigma values. 3 Input impedance shown over frequency range in Figure 24. 4 Double slashes ( ) denote "in parallel with." 5 Linear regression calculation for error curve taken from 40 dBm to 10 dBm for all parameters. 6 Dynamic range refers to range over which the linearity error remains within the stated bound. 7 Linear regression calculation for error curve taken from 60 dBm to 5 dBm for 3 dB dynamic range. All other regressions taken from 40 dBm to 10 dBm. 8 AC response shown in Figure 10. Specifications subject to change without notice.
REV. B
3
AD8313
ABSOLUTE MAXIMUM RATINGS* PIN FUNCTION DESCRIPTIONS
Supply Voltage VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V VOUT, VSET, PWDN . . . . . . . . . . . . . . . . . . . . . . 0 V, VPOS Input Power Differential (re: 50 , 5.5 V) . . . . . . . . . +25 dBm Input Power Single-Ended (re: 50 , 5.5 V) . . . . . . . +19 dBm Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . . 200 mW JA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200°C/W 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
*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 effect device reliability.
Pin 1, 4 2 3 5
Name VPOS INHI INLO PWDN
Description Positive supply voltage (VPOS), +2.7 V to +5.5 V. Noninverting Input. This input should be ac coupled. Inverting Input. This input should be ac coupled. Connect pin to ground for normal operating mode. Connect pin to supply for powerdown mode. Device Common. Setpoint input for operation in controller mode. To operate in RSSI mode, short VSET and VOUT. Logarithmic/Error Output.
6 7
COMM VSET
PIN CONFIGURATION
8
VPOS 1 INHI 2
8
VOUT
VOUT
VSET TOP VIEW INLO 3 (Not to Scale) 6 COMM
7
AD8313
VPOS 4
5
PWDN
ORDERING GUIDE
Model AD8313ARM AD8313ARM-REEL AD8313ARM-REEL7 AD8313-EVAL
Temperature Range 40°C to +85°C 40°C to +85°C 40°C to +85°C
Package Descriptions 8-Lead µSOIC 13" Tape and Reel 7" Tape and Reel Evaluation Board
Package Option RM-08 RM-08 RM-08
Brand Code J1A J1A J1A
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 AD8313 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy [>250 V HBM] electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
4
REV. B
Typical Performance Characteristics AD8313
2.0 1.8 1.6 1.4 VS = +5V INPUT MATCH SHOWN IN FIGURE 27
2.0 1.8 1.6 1.4 VS = +5V INPUT MATCH SHOWN IN FIGURE 27 5 4 3 2 40 C +25 C +85 C 1 0 1 2 3 SLOPE AND INTERCEPT NORMALIZED AT +25 C AND APPLIED TO 40 C AND +85 C 60 50 40 30 20 10 INPUT AMPLITUDE dBm 0 4 5 10
VOUT Volts
1.2 1.0 0.8 0.6 0.4 0.2 0 70 60 50 40 30 20 INPUT AMPLITUDE dBm 10 0 10 900MHz 1.9GHz 2.5GHz
1.2 1.0 0.8 0.6 0.4 0.2 0 70
Figure 2. VOUT vs. Input Amplitude
Figure 5. VOUT and Log Conformance vs. Input Amplitude at 900 MHz; 40°C, +25°C and +85°C
6 VS = +5V INPUT MATCH SHOWN IN FIGURE 27 4 900MHz 2 ERROR dB 100MHz VOUT Volts
2.0 1.8 1.6 40 C 1.4 1.2 1.0 0.8 0.6 0.4 +25 C +85 C VS = +5V INPUT MATCH SHOWN IN FIGURE 27
5 4 3 2 1 0 1 2 3 SLOPE AND INTERCEPT NORMALIZED AT +25 C AND APPLIED TO 40 C AND +85 C 60 50 40 30 20 10 INPUT AMPLITUDE dBm 0 4 5 10 ERROR dB
0 2.5GHz 100MHz 1.9GHz 4
900MHz
2
1.9GHz
2.5GHz
0.2 6 70 60 50 40 30 20 INPUT AMPLITUDE dBm 10 0 10
0 70
Figure 3. Log Conformance vs. Input Amplitude
Figure 6. VOUT and Log Conformance vs. Input Amplitude at 1.9 GHz; 40°C, +25°C and +85°C
2.0 1.8 1.6 1.4 VS = +5V INPUT MATCH SHOWN IN FIGURE 27
5 4 3 2
2.0 1.8 1.6 40 C 1.4 VS = +5V INPUT MATCH SHOWN IN FIGURE 27
5 4 3 2 1 +25 C SLOPE AND INTERCEPT NORMALIZED AT +25 C AND APPLIED TO 40 C AND +85 C +85 C 0 1 2 3 4 40 30 20 10 INPUT AMPLITUDE dBm 0 5 10
ERROR dB
1.2 1.0 0.8 0.6 0.4 0.2 0 70
1 0
1.2 1.0 0.8 0.6 0.4 0.2 0 70 60
+25 C +85 C 1 2 3 SLOPE AND INTERCEPT NORMALIZED AT +25 C AND APPLIED TO 40 C AND +85 C 60 50 40 30 20 INPUT AMPLITUDE dBm 10 0 4 5 10
50
Figure 4. VOUT and Log Conformance vs. Input Amplitude at 100 MHz; 40°C, +25°C and +85°C
Figure 7. VOUT and Log Conformance vs. Input Amplitude at 2.5 GHz; 40°C, +25°C and +85°C
REV. B
5
ERROR dB
VOUT Volts
VOUT Volts
40 C
ERROR dB
VOUT Volts
100MHz
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