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AD8312 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD8312
Beschreibung RF Detector
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 21 Seiten
AD8312 Datasheet, Funktion
Data Sheet
50 MHz to 3.5 GHz, 45 dB RF Detector
AD8312
FEATURES
GENERAL DESCRIPTION
Complete RF detector function
Typical range: −45 dBm to 0 dBm, referencing 50 Ω
Frequency response from 50 MHz to 3.5 GHz
Temperature stable linear in dB response
Accurate to 3.5 GHz
Rapid response: 85/120 ns (rise/fall)
Low power: 12 mW at 2.7 V
APPLICATIONS
Cellular handsets (GSM, CDMA, WCDMA)
RSSI and TSSI for wireless terminal devices
Transmitter power measurement
The AD8312 is a complete, low cost subsystem for the
measurement of radio frequency (RF) signals in the frequency
range of 50 MHz to 3.5 GHz. It has a typical dynamic range of
45 dB and is 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 −40°C to +85°C. Its high sensitivity allows
measurement 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 −45 dBm to 0 dBm, referencing 50 Ω.
For convenience, the signal is internally ac-coupled, using a
5 pF capacitor to a load of 3 kΩ in shunt with 1.3 pF. This high-
pass coupling, with a corner at approximately 16 MHz, determines
the lowest operating frequency. Therefore, the source may be dc
grounded.
The AD8312 output, VOUT, increases from close to ground to
about 1.2 V because the input signal level increases from 1.25 mV
to 224 mV. A capacitor may be connected between the VOUT
and CFLT pins when it is desirable to increase the time interval
over which averaging of the input waveform occurs.
The AD8312 is available in a 6-ball, 1.0 mm × 1.5 mm, wafer
level chip scale package and consumes 4.2 mA from a 2.7 V to
5.5 V supply.
FUNCTIONAL BLOCK DIAGRAM
RFIN
CFLT
V-I
+
I-V
DET
DET
DET
DET
DET
10dB
10dB
10dB
10dB
BAND-GAP
REFERENCE
VSET
VOUT
VPOS
COMM
OFFSET
COMPENSATION
AD8312
Figure 1.
Rev. B
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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Tel: 781.329.4700 ©2005–2015 Analog Devices, Inc. All rights reserved.
Technical Support
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AD8312 Datasheet, Funktion
Data Sheet
Parameter
POWER INTERFACE
Supply Voltage
Quiescent Current
vs. Temperature
Test Conditions/Comments
VPOS (Pin 1)
−40°C ≤ TA ≤ +85°C
1 Increased output is possible when using an attenuator between VOUT and VSET to raise the slope.
Min Typ
2.7 3.0
2.8 4.2
4.3
AD8312
Max Unit
5.5 V
5.7 mA
mA
Rev. B | Page 5 of 20

6 Page









AD8312 pdf, datenblatt
Data Sheet
Table 4. Typical Specifications at Selected Frequencies at 25°C (Mean and Σ)
Frequency (GHz)
0.05
0.1
0.9
1.9
2.2
2.5
3.0
3.5
1 Refer to Figure 23.
Slope (mV/dB)
µσ
20.25
0.3
21.0 0.2
20.25
0.3
19.47
0.3
19.1 0.4
18.6 0.6
17.5 0.7
17.1 0.7
Intercept (dBm)
µσ
−51.5
0.4
−50.5
0.4
−51.9
0.4
−52.4
0.6
−52.1
0.85
−51.2
1.2
−46.9
2.5
−42.6
2.5
AD8312
±1 dB Dynamic Range1 (dBm)
High Point
Low Point
µ σµ
σ
+3.0 0.12 −48.0
0.13
+2.0 0.1
−46.0
0.1
+0.2 0.1
−49.0
0.2
+1.5 0.12 −48.8
0.3
+1.5 0.2
−48.5
0.4
+2.0 0.3
−47.7
0.5
−4 0.3 −46
0.4
−1 0.3 −39
0.3
Rev. B | Page 11 of 20

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