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Details, datasheet, quote on part number:AD8314A
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Datasheet text preview:
a
FEATURES Complete RF Detector/Controller Function Typical Range 58 dBV to 13 dBV F 45 dBm to 0 dBm re 50 requency Response from 100 MHz to 2.7 GHz Temperature-Stable Linear-in-dB Response Accurate to 2.7 GHz Rapid Response: 70 ns to a 10 dB Step Low Power: 12 mW at 2.7 V Power-Down to 20 A APPLICATIONS Cellular Handsets (TDMA, CDMA, GSM) RSSI and TSSI for Wireless Terminal Devices Transmitter Power Measurement and Control PRODUCT DESCRIPTION
100 MHz2.7 GHz 45 dB RF Detector/Controller AD8314*
For convenience, the signal is internally ac-coupled, using a 5 pF capacitor to a load of 3 k in shunt with 2 pF. This high-pass coupling, with a corner at approximately 16 MHz, determines the lowest operating frequency. Thus, the source may be dc-grounded. The AD8314 provides two voltage outputs. The first, called V_UP, increases from close to ground to about 1.2 V as the input signal level increases from 1.25 mV to 224 mV. This output is intended for use in measurement mode. Consult the Applications section of this data sheet for information on use in this mode. A capacitor may be connected between the V_UP and FLTR pins when it is desirable to increase the time interval over which averaging of the input waveform occurs. The second output, V_DN, is an inversion of V_UP, but with twice the slope and offset by a fixed amount. This output starts at about 2.25 V (provided the supply voltage is 3.3 V) for the minimum input and falls to a value close to ground at the maximum input. This output is intended for analog control loop applications. A setpoint voltage is applied to VSET and V_DN is then used to control a VGA or power amplifier. Here again, an external filter capacitor may be added to extend the averaging time. Consult the Applications section of this data sheet for information on use in this mode. The AD8314 is available in micro_SOIC and chip scale packages and consumes 4.5 mA from a 2.7 V to 5.5 V supply. When powered down, the typical sleep current is 20 µA.
The AD8314 is a complete low cost subsystem for the measurement and control of RF signals in the frequency range of 100 MHz to 2.7 GHz, with a typical dynamic range of 45 dB, intended for use in a wide variety of cellular handsets and other wireless devices. It provides a wider dynamic range and better accuracy than possible using discrete diode detectors. In particular, its temperature stability is excellent over the full operating range of 30°C to +85°C. Its high sensitivity allows control at low power levels, thus reducing the amount of power that needs to be coupled to the detector. It is essentially a voltage-responding device, with a typical signal range of 1.25 mV to 224 mV rms or 58 dBV to 13 dBV. This is equivalent to 45 dBm to 0 dBm re 50 .
FUNCTIONAL BLOCK DIAGRAM
FLTR V-I VSET
I-V DET DET DET DET DET X2 10dB 10dB 10dB 10dB BAND-GAP REFERENCE VPOS ENBL
V UP
RFIN
V DN
OFFSET COMPENSATION COMM (PADDLE)
AD8314
REV. A
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. 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 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2002
AD8314SPECIFICATIONS (V = 3 V, T = 25 C, unless otherwise noted)
S A
Parameter OVERALL FUNCTION Frequency Range1 Input Voltage Range Equivalent Power Range Logarithmic Slope Logarithmic Intercept Equivalent dBm Level INPUT INTERFACE DC Resistance to COMM Inband Input Resistance Input Capacitance MAIN OUTPUT Voltage Range Minimum Output Voltage Maximum Output Voltage3 General Limit Available Output Current Response Time Residual RF (at 2f) INVERTED OUTPUT Gain Referred to V_UP Minimum Output Voltage Maximum Output Voltage Available Output Current Output-Referred Noise Response Time Full-Scale Settling Time SETPOINT INPUT Voltage Range Input Resistance Logarithmic Scale Factor ENABLE INTERFACE Logic Level to Enable Power Input Current when HI Logic Level to Disable Power POWER INTERFACE Supply Voltage Quiescent Current Over Temperature Total Supply Current when Disabled Over Temperature
Conditions To Meet All Specifications Internally AC-Coupled 52.3 External Termination Main Output, V_UP, 100 MHz2 Main Output, V_UP, 100 MHz 52.3 External Termination (Pin RFIN) f = 0.1 GHz f = 0.1 GHz (Pin V_UP) V_UP Connected to VSET No Signal at RFIN, RL 10 k RL 10 k 2.7 V VS 5.5 V Sourcing/Sinking 10%90%, 10 dB Step f = 0.1 GHz (Worst Condition) (Pin V_DN) VDN = 2.25 V 2 × VUP VS 3.3 V VS 3.3 V4 Sourcing/Sinking RF Input = 2 GHz, 33 dBV, fNOISE = 10 kHz 10%90%, 10 dB Input Step 40 dBm to 0 dBm Input Step, to 95% (Pin VSET) Corresponding to Central 40 dB f = 0.900 GHz f = 1.900 GHz (Pin ENBL) HI Condition, 30°C TA +85°C 2.7 V at ENBL, 30°C TA +85°C LO Condition, 30°C TA +85°C (Pin VPOS) 30°C TA +85°C 30°C TA +85°C
Min 0.1 1.25 45 18.85 68 55
Typ
Max 2.5 224 0 23.35 56 43
Unit GHz mV rms dBm mV/dB dBV dBm k k pF
21.3 62 49 100 3 2
0.01 0.01 1.9 VS 1.1 1/0.5
0.02 2 VS 1 2/1 70 100 2 0.05 2.2 6/200 1.05 70 150
1.2 0.05
V V V V mA ns µV
0.01 2.1 4/100
0.1 2.5
V V mA/µA µV/Hz ns ns V k mV/dB mV/dB V µA V V mA mA µA µA
0.15 7
1.2 10 20.7 19.7 VPOS 300 0.8 5.5 5.7 6.6 95
1.6 20 0.5 2.7 3.0 2.7 3.0 4.5 4.4 20 40
NOTES 1 For a discussion on operation at higher frequencies, see Applications section. 2 Mean and Standard Deviation specifications are available in Table I. 3 Increased output possible when using an attenuator between V_UP and VSET to raise the slope. 4 Refer to TPC 19 for details. Specifications subject to change without notice.
2
REV. A
AD8314
ABSOLUTE MAXIMUM RATINGS* Pin Function Descriptions
Supply Voltage VPOS . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V V_UP, V_DN, VSET, ENBL . . . . . . . . . . . . . . . . 0 V, VPOS Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 V rms Equivalent Power . . . . . . . . . . . . . . . . . . . . . . . . . . . +17 dBm Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . 200 mW JA (µSO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200°C/W JA (CSP, Paddle Soldered) . . . . . . . . . . . . . . . . . . . . 80°C/W JA (CSP, Paddle not Soldered) . . . . . . . . . . . . . . . . 200°C/W Maximum Junction Temperature . . . . . . . . . . . . . . . . . 125°C Operating Temperature Range . . . . . . . . . . . 30°C to +85°C Storage Temperature Range . . . . . . . . . . . . 65°C to +150°C Lead Temperature Range (Soldering 60 sec) µSO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300°C C S P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240°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 affect device reliability.
Pin 1 2 3
Name RFIN ENBL VSET
Function RF Input C o n n e c t pin to V S for normal operation. Connect pin to ground for disable mode. Setpoint input for operation in controller mode. To operate in detector mode connect VSET to V_UP. Connection for an external capacitor to slow the response of the output. Capacitor is connected between FLTR and V_UP. Device Common (Ground) Logarithmic output. Output voltage increases with increasing input amplitude. Inversion of V_UP, governed by the following equation: V_DN = 2.25 V 2 × VUP. Positive supply voltage (VS), 2.7 V to 5.5 V.
4
FLTR
5 6 7 8
COMM V_UP V_DN VPOS
PIN CONFIGURATION
RFIN 1 ENBL 2
8
VPOS
V DN TOP VIEW VSET 3 (Not to Scale) 6 V UP
7
AD8314
FLTR 4
5
COMM
ORDERING GUIDE
Model AD8314ARM AD8314ARM-REEL AD8314ARM-REEL7 AD8314-EVAL AD8314ACP-REEL AD8314ACP-REEL7 AD8314ACP-EVAL
Temperature Range 30°C to +85°C
Package Description Tube, 8-Lead micro_SOIC 13" Tape and Reel 7" Tape and Reel Evaluation Board 13" Tape and Reel 8-Lead Chip Scale Package 7" Tape and Reel Evaluation Board
Package Option RM-8
Branding Information J5A
30°C to +85°C
CP-8
J5A
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 AD8314 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. A
3
AD8314 Typical Performance Characteristics
1.2 0.1GHz
4 3
1.0
2.5GHz 2
0.9GHz
1.9GHz
ERROR dB
0.8
VUP Volts
0.1GHz
1 0 1 2
1.9GHz 0.6 2.5GHz
0.4
0.9GHz
0.2
3 4 70
0 75
65 (52dBm)
55 45 35 25 INPUT AMPLITUDE dBV
15 (2dBm)
5
60 (47dBm)
50 40 30 20 INPUT AMPLITUDE dBV
10 (+3dBm)
0
TPC 1. VUP vs. Input Amplitude
TPC 4. Log Conformance vs. Input Amplitude
1.2
3
1.2
3
1.0 +25 C 0.8 VUP Volts 30 C 0.6 +25 C +85 C 30 C
2
1.0 +85 C
2
1 ERROR dB VUP Volts
0.8 +25 C 0.6 30 C 0.4
1 ERROR dB ERROR dB
0
0
0.4
1
1
0.2
SLOPE AND INTERCEPT NORMALIZED AT +25 C AND APPLIED TO 30 C AND +85 C 60 (47dBm) 50 40 30 20 INPUT AMPLITUDE dBV 10 (+3dBm) 0
2
0.2
SLOPE AND INTERCEPT NORMALIZED AT +25 C AND APPLIED TO 30 C AND +85 C 60 (47dBm) 50 40 30 20 INPUT AMPLITUDE dBV 10 (+3dBm) 0
2
0 70
3
0 70
3
TPC 2. VUP and Log Conformance vs. Input Amplitude at 0.1 GHz; 30°C, +25°C, and +85°C
TPC 5. VUP and Log Conformance vs. Input Amplitude at 1.9 GHz; 30°C, +25°C, and +85°C
1.2
3
1.2
3
1.0
2 +25 C 1 ERROR dB VUP Volts +85 C
1.0 +85 C +85 C +25 C 30 C 0.4
2
0.8 VUP Volts
0.8
1
0.6
30 C
0
0.6
0
0.4
1
1
0.2
SLOPE AND INTERCEPT NORMALIZED AT +25 C AND APPLIED TO 30 C AND +85 C 60 (47dBm) 50 40 30 20 INPUT AMPLITUDE dBV 10 (+3dBm) 0
2
0.2
SLOPE AND INTERCEPT NORMALIZED AT +25 C AND APPLIED TO 30 C AND +85 C 60 (47dBm) 50 40 30 20 INPUT AMPLITUDE dBV 10 (+3dBm) 0
2
0 70
3
0 70
3
TPC 3. VUP and Log Conformance vs. Input Amplitude at 0.9 GHz; 30°C, +25°C, and +85°C
TPC 6. VUP and Log Conformance vs. Input Amplitude at 2.5 GHz; 30°C, +25°C, and +85°C
4
REV. A
AD8314
23
55 30 C
22
VUP INTERCEPT dBV
30 C
60
SLOPE mV/dB
+25 C 65 +85 C
21 +25 C 20 +85 C 19
70
18 0 0.5 1.0 1.5 FREQUENCY GHz 2.0 2.5
75 0 0.5 1.0 1.5 FREQUENCY GHz 2.0 2.5
TPC 7. Slope vs. Frequency; 30°C, +25°C, and +85°C
TPC 10. VUP Intercept vs. Frequency: 30°C, +25°C, and +85 ° C
22
61 0.1GHz
0.1GHz
VUP INTERCEPT dBV
62 2.5GHz 63 0.9GHz 64
VUP SLOPE mV/dB
21 0.9GHz
20
1.9GHz
65
66
2.5GHz 19 2.5
1.9GHz
5.0 5.5
3.0
3.5
4.0 VS Volts
4.5
67 2.5
3.0
3.5
4.0 VS Volts
4.5
5.0
5.5
TPC 8. VUP Slope vs. Supply Voltage
TPC 11. VUP Intercept vs. Supply Voltage
3500 X 3000 2500 FREQUENCY (GHz) 0.1 0.9 1.9 2.5 R || - jX 3030 || - j748 760 || - j106 301 || - j80 90 || - j141
0 200
6
5
SUPPLY CURRENT mA
400
4 DECREASING VENBL INCREASING VENBL
RESISTANCE
REACTANCE
2000
600
3 2
1500 R 1000 R 500 0 0 0.5 1.0 1.5 FREQUENCY GHz 2.0 X
800
1000 1200 1400 2.5
1
0 1 0.2
0.4
0.6
0.8 1.0
1.2 1.4 1.6 1.8 2.0 VENBL Volts
2.2 2.4
2.6
PC 9. Input Impedance
TPC 12. Supply Current vs. ENBL Voltage, VS = 3 V
REV. A
T
5
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