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Details, datasheet, quote on part number:AD8310A
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Datasheet text preview:
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FEATURES Multistage Demodulating Logarithmic Amplifier Voltage Output, Rise-Time <15 ns High-Current Capacity: 25 mA into Grounded R L 95 dB Dynamic Range: 91 dBV to +4 dBV Single Supply of 2.7 V Min at 8 mA Typ DC-440 MHz Operation, 0.4 dB Linearity Slope of 24 mV/dB, Intercept of 108 dBV Highly Stable Scaling over Temperature Fully Differential DC-Coupled Signal Path 100 ns Power-Up Time, 1 A Sleep Current APPLICATIONS Conversion of Signal Level to Decibel Form Transmitter Antenna Power Measurement Receiver Signal Strength Indication (RSSI) Low-Cost Radar and Sonar Signal-Processing Network and Spectrum Analyzers Signal-Level Determination Down to 20 Hz True-Decibel AC Mode for Multimeters
Fast, Voltage-Out DC-440 MHz 95 dB Logarithmic Amplifier AD8310
FUNCTIONAL BLOCK DIAGRAM
AD8310
8mA ANDGAP REFERENCE AND BIASING SIX 14.3dB 900MHz AMPLIFIER STAGES B 3 NINE DETECTOR CELLS SPACED 14.3dB COMMON COMM INPUT-OFFSET COMPENSATION LOOP 2 MIRROR 2A /dB 3k COMM 1 k OFLT 33pF COMM OFFSET FILTER + 3k VOUT OUTPUT ENBL ENABLE BUFFER INPUT VPOS SUPPLY
BFIN
+INPUT INPUT
INHI 1.0k INLO
COMM
PRODUCT DESCRIPTION
The AD8310 is a complete, dc-440 MHz demodulating logarithmic amplifier (log amp) with a very fast voltage-mode output capable of driving up to 25 mA into a grounded load in under 15 ns. It uses the progressive compression (successive detection) technique to provide a dynamic range of up to 95 dB to ±3 dB law-conformance, or 90 dB to a ±1 dB error bound up to 100 MHz. It is extremely stable and easy to use, requiring no significant external components. A single supply voltage of 2.7 V to 5.5 V at 8 mA is needed, corresponding to a power consumption of only 24 mW at 3 V. A fast-acting CMOS-compatible enable pin is provided. Each of the six cascaded amplifier/limiter cells has a small-signal gain of 14.3 dB, with a 3 dB bandwidth of 900 MHz. A total of nine detector cells are used, to provide a dynamic range that extends from 91 dBV (where 0 dBV is defined as the amplitude of a 1 V rms sine wave) that is, an amplitude of about ± 40 µV, up to +4 dBV (or ± 2.2 V). The demodulated output is accurately scaled, with a log slope of 24 mV/dB and an intercept of 108 dBV; the scaling parameters are supply- and temperatureindependent. The fully-differential input offers a moderately high impedance (1 k in parallel with about 1 pF). A simple n e t w o r k can match the input to 50 and provide a power
sensitivity of to 78 dBm to +17 dBm. The logarithmic linearity is typically within ± 0.4 dB up to 100 M H z over the central portion of the range, but is somewhat greater at 440 MHz. There is no minimum frequency limit; the AD8310 may be used down to low audio frequencies. Special filtering features are provided to support this wide range. The output voltage runs from a noise-limited lower boundary of 400 mV to an upper limit within 200 mV of the supply voltage for light loads. The slope and intercept can be readily altered using external resistors. The output is tolerant of a wide variety of load conditions and is stable with capacitive loads of 100 pF. The AD8310 provides a unique combination of low cost, small size, small power consumption, high accuracy and stability, high dynamic range, a frequency range encompassing audio to UHF, fast response time and good load-driving capabilities, making this product useful in numerous applications requiring the reduction of a signal to its decibel equivalent. The AD8310 is available in the industrial temperature range of 40°C to +85°C, in an 8-lead Mini_SO package.
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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., 1999
AD8310SPECIFICATIONS (@ T = 25 C, V = 5 V, unless otherwise noted)
A S
Parameter INPUT STAGE Maximum Input1 Equivalent Power in 50 Noise Floor Equivalent Power in 50 Input Resistance Input Capacitance DC Bias Voltage LOGARITHMIC AMPLIFIER ± 3 dB Error Dynamic Range Transfer Slope Intercept (Log Offset)2
Conditions (Inputs INHI, INLO) Single-Ended, p-p Termination Resistor of 52.3 Differential Drive, p-p Terminated 50 Source 440 MHz Bandwidth From INHI to INLO From INHI to INLO Either Input (Output VOUT) From Noise Floor to Maximum Input 10 MHz f 200 MHz Over Temperature 40°C < TA < +85°C 10 MHz f 200 MHz Equivalent dBm (re 50 ) Over Temperature 40°C TA +85°C Equivalent dBm (re 50 ) Temperature Sensitivity Input from 88 dBV (75 dBm) to +2 dBV (+15 dBm) Input = 91 dBV (78 dBm) Input = 9 dBV (22 dBm)
Min ± 2.0
Typ ± 2.2 4 17 20 1.28 78 1000 1.4 3.2 95 24 108 95
Max
Unit V dBV dBm dBm n V / H z dBm pF V dB mV/dB mV/dB dBV dBm dBV dBm dB/°C dB V V mA MHz ns ns ns ns ns
800
1200
22 20 115 102 120 107
26 26 99 86 96 83
Linearity Error (Ripple) Output Voltage Minimum Load Resistance, RL Maximum Sink Current Output Resistance Video Bandwidth Rise Time (10%90%)
0.04 ± 0.4 0.4 2.6 100 0.5 0.05 25 15 20 30 40 40 2.7 6.5 5.5 5.5 9.5 10
Fall Time (90%10%)
Output Settling Time to 1% POWER INTERFACES Supply Voltage, VPOS Quiescent Current Over Temperature Disable Current Logic Level to Enable Power Input Current when HI Logic Level to Disable Power
Input Level = 43 dBV (30 dBm), RL 402 , CL 68 pF Input Level = 3 dBV (+10 dBm), RL 402 , CL 68 pF Input Level = 43 dBV (30 dBm), RL 402 , CL 68 pF Input Level = 3 dBV (+10 dBm), RL 402 , CL 68 pF Input Level = 13 dBV (0 dBm), RL 402 , CL 68 pF
Zero-Signal 40°C < TA < +85°C HI Condition, 40°C < TA < +85°C 3 V at ENBL LO Condition, 40°C < TA < +85°C
8.0 8.5 0.05 2.3 35 0.8
V mA mA µA V µA V
NOTES 1 The input level is specified in "dBV" since logarithmic amplifiers respond strictly to voltage, not power. 0 dBV corresponds to a sinusoidal single-frequency input of 1 V rms. A power level of 0 dBm (1 mW) in a 50 termination corresponds to an input of 0.2236 V rms. Hence, the relationship between dBV and dBm is a fixed offset of 13 dBm in the special case of a 50 termination. 2 Guaranteed but not tested; limits are specified at six sigma levels. Specifications subject to change without notice.
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AD8310
ABSOLUTE MAXIMUM RATINGS* ORDERING GUIDE
Supply Voltage VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5 V Input Power (re 50 ), Single-Ended . . . . . . . . . . . . . 18 dBm Differential Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 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.
Model AD8310ARM* AD8310ARM-REEL AD8310ARM-REEL7 AD8310-EVAL
*Device branded as J6A.
Package Description RM-8 Tube RM-8 13" Tape and Reel RM-8 7" Tape and Reel Evaluation Board
Package Option RM-8 RM-8 RM-8
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 AD8310 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
PIN FUNCTION DESCRIPTIONS
PIN CONFIGURATION
Pin 1 2 3 4 5 6 7 8
Name INLO COMM OFLT VOUT VPOS BFIN ENBL INHI
Function One of two balanced inputs, biased roughly to VPOS/2. Common Pin (usually grounded). Offset filter access, nominally at about 1.75 V. Low impedance output voltage, 25 mA max load. Positive Supply, 2.7 V 5.5 V at 8 mA quiescent current. Buffer input; used to lower post-detection bandwidth. CMOS-compatible chip enable (active when `HI'). Second of two balanced inputs.
INLO 1 COMM 2
8
INHI
ENBL TOP VIEW OFLT 3 (Not to Scale) 6 BFIN
7 5
AD8310
VOUT 4
VPOS
REV. A
3
AD8310 Typical Performance Characteristics
100 10 SUPPLY CURRENT mA 1 0.1 0.01 TA = +25 C 0.001 TA = +85 C VOUT 500mV PER VERTICAL DIVISION 100ns PER HORIZONTAL DIVISION
GND REFERENCE INPUT 500mV PER VERTICAL DIVISION
0.0001 TA = 40 C 0.00001 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5
3dBV INPUT LEVEL SHOWN HERE
ENABLE VOLTAGE V
Figure 1. Supply Current vs. Enable Voltage @ TA = 40°C, +25 °C and +85 °C
Figure 4. RSSI Pulse Response with RL = 402 and CL = 68 pF, for Inputs Stepped from Zero to 33 dBV, 23 dBV, 13 dBV, and 3 dBV
VOUT 500mV PER VERTICAL DIVISION
3dBV 23dBV 43dBV 63dBV 83dBV VOUT 500mV PER VERTICAL DIVISION CURVES OVERLAP
GND REFERENCE INPUT
5V PER VERTICAL DIVISION
ENABLE 500mV PER VERTICAL DIVISION 100ns PER HORIZONTAL DIVISION
200ns PER HORIZONTAL DIVISION
Figure 2. Power On/Off Response Time with RF Input of 83 dBV to 3 dBV
Figure 5. Large Signal RSSI Pulse Response with RL = 100 and CL = 33 pF, 68 pF and 100 pF
200 VOUT 500mV PER VERTICAL DIVISION 100 154
VOUT 200mV PER VERTICAL DIVISION 100ns PER HORIZONTAL DIVISION
GND REFERENCE INPUT 500mV PER VERTICAL DIVISION 100ns PER HORIZONTAL DIVISION
GND REFERENCE INPUT 20mV PER VERTICAL DIVISION
Figure 3. Large Signal RSSI Pulse Response with CL = 100 pF and RL = 100 , 154 , and 200
Figure 6. Sma ll Signal RSSI Pulse Response with RL = 50 and Back Termination of 50 (Total Load = 100 )
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AD8310
3.0 100pF 3300pF 0.01 F GROUND REFERENCE VOUT 500mV PER VERTICAL DIVISION 10MHz 50MHz 2.5 100MHz RSSI OUTPUT V 2.0
1.5
1.0
50 s PER HORIZONTAL DIVISION
0.5
0 120
100 (87dBm)
80
60
40
20
INPUT LEVEL dBV
0 (+13dBm)
20
Figure 7. Small Signal AC Response of RSSI Output with External BFIN Capacitance of 100 pF, 3300 pF and 0.01 µF
Figure 10. RSSI Output vs. Input Level at TA = 25°C for Frequencies of 10 MHz, 50 MHz, and 100 MHz
3.0 200MHz 300MHz 500mV PER VERTICAL DIVISION VOUT RSSI OUTPUT V 25ns PER HORIZONTAL DIVISION 2.5
2.0 440MHz 1.5
GROUND REFERENCE 10mV PER VERTICAL DIVISION INPUT
1.0
0.5
0 120
100 (87dBm)
80
60 40 20 INPUT LEVEL dBV
0 (+13dBm)
20
Figure 8. Small Signal RSSI Pulse Response with RL = 402 and CL = 68 pF
Figure 11. RSSI Output vs. Input Level at TA = 25 °C for Frequencies of 200 MHz, 300 MHz, and 440 MHz
3.0
5 4
2.5
3 2
RSSI OUTPUT V
ERROR dB
2.0
TA = +85 C 1 0 1 2 3 TA = +25 C TA = 40 C
1.5 TA = 40 C TA = +25 C 0.5 TA = +85 C 0 120 100 (87dBm) 80 60 40 20 INPUT LEVEL dBV 0 (+13dBm) 20
1.0
4 5 120 100 (87dBm) 80 60 40 20 0 (+13dBm) 20
INPUT LEVEL dBV
Figure 9. RSSI Output vs. Input Level, 100 MHz Sine Input at TA = 40°C, +25 °C and +85 °C, Single-Ended Input
Figure 12. Log Linearity of RSSI Output vs. Input Level, 100 MHz Sine Input at TA = 40°C, +25 °C and +85 °C
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