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PDF AD8315 Data sheet ( Hoja de datos )
| Número de pieza | AD8315 | |
| Descripción | 50 dB GSM PA Controller | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
50 dB GSM PA Controller
AD8315
FEATURES
Complete RF detector/controller function
>50 dB range at 0.9 GHz (−49 dBm to +2 dBm, re 50 Ω)
Accurate scaling from 0.1 GHz to 2.5 GHz
Temperature-stable linear-in-dB response
Log slope of 23 mV/dB, intercept at −60 dBm at 0.9 GHz
True integration function in control loop
Low power: 20 mW at 2.7 V, 38 mW at 5 V
Power-down to 10.8 μW
APPLICATIONS
Single, dual, and triple band mobile handset (GSM, DCS, EDGE)
Transmitter power control
GENERAL DESCRIPTION
The AD8315 is a complete low cost subsystem for the precise
control of RF power amplifiers operating in the frequency range
0.1 GHz to 2.5 GHz and over a typical dynamic range of 50 dB.
It is intended for use in cellular handsets and other battery-
operated wireless devices. The log amp technique provides a much
wider measurement range and better accuracy than controllers
using diode detectors. In particular, the temperature stability is
excellent over a specified range of −30°C to +85°C.
Its high sensitivity allows control at low signal levels, thus
reducing the amount of power that must be coupled to
the detector.
For convenience, the signal is internally ac-coupled. This
high-pass coupling, with a corner at approximately 0.016 GHz,
determines the lowest operating frequency. Therefore, the
source can be dc grounded.
The AD8315 provides a voltage output, VAPC, that has the
voltage range and current drive to directly connect to most
handset power amplifiers’ gain control pin. VAPC can swing
from 250 mV above ground to within 200 mV below the supply
voltage. Load currents of up to 6 mA can be supported.
The setpoint control input is applied to the VSET pin and has
an operating range of 0.25 V to 1.4 V. The associated circuit
determines the slope and intercept of the linear-in-dB
measurement system; these are nominally 23 mV/dB and
−60 dBm for a 50 Ω termination (−73 dBV) at 0.9 GHz.
Further simplifying the application of the AD8315, the input
resistance of the setpoint interface is over 100 MΩ, and the bias
current is typically 0.5 μA.
The AD8315 is available in MSOP and LFCSP packages and
consumes 8.5 mA from a 2.7 V to 5.5 V supply. When powered
down, the sleep current is 4 μA.
FUNCTIONAL BLOCK DIAGRAM
VPOS
ENBL
LOW NOISE
GAIN BIAS
LOW NOISE
BAND GAP
REFERENCE
OUTPUT
ENABLE
DELAY
RFIN
DET
DET
DET
DET
DET
10dB
10dB
10dB
10dB
×1.35
HI-Z
VAPC
LOW NOISE (25nV/√Hz)
RAIL-TO-RAIL BUFFER
FLTR
COMM
OFFSET
COMP’N
INTERCEPT
POSITIONING
VSET
V-I
23mV/dB
250mV TO
1.4V = 50dB
Figure 1.
Rev. D
Document Feedback
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©1999–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
AD8315
Data Sheet
Parameter
POWER INTERFACE
Supply Voltage
Quiescent Current
Over Temperature
Disable Current6
Over Temperature
Test Conditions/Comments
Pin VPOS
ENBL high
−30°C ≤ TA ≤ +85°C
ENBL low
−30°C ≤ TA ≤ +85°C
Min Typ
2.7
8.5
4
1 Operation down to 0.02 GHz is possible.
2 Mean and standard deviation specifications are available in Table 2
3 See Figure 12 for plot of input impedance vs. frequency.
4 This parameter is guaranteed but not tested in production. Limit is −3 sigma from the mean.
5 Response time in a closed-loop system depends on the filter capacitor (CFLT) used and the response of the variable gain element.
6 This parameter is guaranteed but not tested in production. Maximum specified limit on this parameter is the 6 sigma value.
Max Unit
5.5 V
10.7 mA
12.9 mA
10 μA
13 μA
Table 2. Typical Specifications at Selected Frequencies at 25°C (Mean and Sigma)
±1 dB Dynamic Range
Slope (mV/dB)
Intercept (dBV)
Low Point (dBV)
High Point (dBV)
Frequency (GHz)
Mean
Sigma
Mean
Sigma
Mean
Sigma
Mean
Sigma
0.1
23.8 0.3
−70.1
1.8
−57.7
1.3
−10.6
0.8
0.9
23.2 0.4
−72.6
1.8
−61.0
1.3
−11.2
0.8
1.9
22.2 0.3
−73.8
1.6
−62.9
0.9
−18.5
1.7
2.5
22.3 0.4
−75.6
1.5
−64.0
1.1
−20.0
1.7
Rev. D | Page 4 of 22
5 Page 
AD8315
3.5
3.3
2mA
3.1 0mA
2.9
4mA
2.7 6mA
2.5
2.3
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5
SUPPLY VOLTAGE (V)
Figure 22. Maximum VAPC Voltage vs. Supply Voltage by Load Current
GND
GND
AVERAGE = 16 SAMPLES
200mV PER VERTICAL
DIVISION
VAPC
1V PER
VERTICAL
DIVISION
2µs PER
HORIZONTAL
DIVISION
VENBL
Figure 23. ENBL Response Time
R AND S
SMT03
SIGNAL
GENERATOR
10MHz REF
OUTPUT
RF OUT
TIMEBASE
STANFORD DS345
PULSE
GENERATOR
TRIG
OUT
PULSE OUT
52.3Ω
220pF
AD8315
1 RFIN
VPOS 8
2 ENBL VAPC 7
3 VSET
NC 6
2.7V
0.1µF
TEK P6205
FET PROBE
TRIG
TEK P6205
FET PROBE
TEK TDS694C
SCOPE
4 FLTR COMM 5
NC = NO CONNECT
Figure 24. Test Setup for ENBL Response Time
Data Sheet
2.8
2.7
2.6
2.5
SHADING INDICATES
±3 SIGMA
2.4
2.7
2.8 2.9
SUPPLY VOLTAGE (V)
3.0
Figure 25. Maximum VAPC Voltage vs. Supply Voltage with 4 mA Load Current
VAPC
AVERAGE = 16 SAMPLES
GND
GND
RF
INPUT
1V PER
VERTICAL
DIVISION
PULSED RF
0.1GHz, –13dBV
100ns PER
HORIZONTAL
DIVISION
Figure 26. VAPC Response Time, Full-Scale Amplitude Change, Open-Loop
R AND S SMT03
SIGNAL
GENERATOR
PULSE
MODULATION
MODE
10MHz REF
OUTPUT
PULSE MODE IN
RF OUT
EXT TRIG
OUT
PICOSECOND
PULSE LABS
PULSE
GENERATOR
TRIG
OUT
PULSE OUT
RF
SPLITTER –3dB
–3dB
52.3Ω
2.7V
AD8315
1 RFIN
VPOS 8
2 ENBL VAPC 7
2.7V
0.1µF
TEK P6205
FET PROBE
TRIG
TEK TDS694C
SCOPE
0.3V
3 VSET
NC 6
NC 4 FLTR COMM 5
NC = NO CONNECT
Figure 27. Test Setup for VAPC Response Time
Rev. D | Page 10 of 22
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet AD8315.PDF ] | |
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