AD8310ARMZ-REEL71 AD [Analog Devices], AD8310ARMZ-REEL71 Datasheet

AD8310ARMZ-REEL71

Manufacturer Part Number

AD8310ARMZ-REEL71

Description

Fast, Voltage-Out DC-440 MHz, 95 dB Logarithmic Amplifier

Manufacturer

AD [Analog Devices]

Datasheet

1.AD8310ARMZ-REEL71.pdf (24 pages)

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FEATURES

Multistage demodulating logarithmic amplifier

Voltage output, rise time <15 ns

High current capacity: 25 mA into grounded RL

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 mA 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

GENERAL 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), 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 temperature-independent.

Rev. D

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. Trademarks and

registered trademarks are the property of their respective owners.

COMMON

The fully differential input offers a moderately high impedance

(1 kΩ in parallel with about 1 pF). A simple network can match

the input to 50 Ω and provide a power sensitivity of −78 dBm to

+17 dBm. The logarithmic linearity is typically within ±0.4 dB

up to 100 MHz over the central portion of the range, but it is

somewhat greater at 440 MHz. There is no minimum frequency

limit; the AD8310 can 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, low 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 that require 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 MSOP package.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.326.8703

Fast, Voltage-Out DC–440 MHz,

SUPPLY

+INPUT

–INPUT

95 dB Logarithmic Amplifier

VPOS

INHI

INLO

1.0kΩ

COMM

FUNCTIONAL BLOCK DIAGRAM

8mA

NINE DETECTOR CELLS

COMPENSATION LOOP

SPACED 14.3dB

INPUT-OFFSET

BAND GAP REFERENCE

SIX 14.3dB 900MHz

AMPLIFIER STAGES

AND BIASING

Figure 1.

MIRROR

2µA

3kΩ

COMM

AD8310

COMM

www.analog.com

1kΩ

–

AD8310

COMM

3kΩ

33pF

ENBL

VOUT

OFLT

BFIN

ENABLE

BUFFER

INPUT

OUTPUT

OFFSET

FILTER

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AD8310ARMZ-REEL71 Summary of contents

Page 1

FEATURES Multistage demodulating logarithmic amplifier Voltage output, rise time <15 ns High current capacity into grounded dynamic range: −91 dBV to +4 dBV Single supply of 2.7 V min typ DC–440 MHz ...

Page 2

AD8310 TABLE OF CONTENTS Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Typical Performance Characteristics ............................................. 6 Theory of Operation ........................................................................ 9 Progressive Compression ............................................................ 9 Slope and Intercept Calibration................................................ 10 Offset Control ...

Page 3

SPECIFICATIONS T = 25° unless otherwise noted Table 1. Parameter Conditions INPUT STAGE Inputs INHI, INLO 1 Maximum Input Single-ended, p-p Equivalent Power in 50 Ω Termination resistor of 52.3 Ω Differential drive, p-p ...

Page 4

AD8310 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage Input Power (re 50 Ω), Single-Ended Differential Drive Internal Power Dissipation θ JA Maximum Junction Temperature Operating Temperature Range Storage Temperature Range Lead Temperature Range (Soldering 60 s) ESD ...

Page 5

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 3. Pin Function Descriptions Pin No. Mnemonic Function 1 INLO One of Two Balanced Inputs, Biased Roughly to VPOS/2. 2 COMM Common Pin (Usually Grounded). 3 OFLT Offset Filter Access, Nominally at about 1.75 ...

Page 6

AD8310 TYPICAL PERFORMANCE CHARACTERISTICS 3.0 2.5 2.0 1 –40° +25° +85° –120 –100 –80 –60 –40 (–87dBm) INPUT LEVEL (dBV) Figure 3. RSSI Output vs. Input Level, 100 ...

Page 7

PER 100pF VERTICAL V OUT DIVISION 3300pF 0.01µF GROUND REFERENCE 50µs PER HORIZONTAL DIVISION Figure 9. Small-Signal AC Response of RSSI Output with External BFIN Capacitance of 100 pF, 3300 pF, and 0.01 µF V OUT 100Ω 154Ω 500mV ...

Page 8

AD8310 100 +85°C A 0.1 0. +25°C A 0.001 0.0001 T = –40°C A 0.00001 0.5 0.7 0.9 1.1 1.3 1.5 1.7 ENABLE VOLTAGE (V) Figure 15. Supply Current vs. Enable Voltage at T ...

Page 9

THEORY OF OPERATION Logarithmic amplifiers perform a more complex operation than classical linear amplifiers, and their circuitry is significantly different. A good grasp of what log amps do and how they do it can help users avoid many pitfalls in ...

Page 10

AD8310 SLOPE AND INTERCEPT CALIBRATION All monolithic log amps from Analog Devices use p design techniques to control the logarithmic slope and intercept. The primary source of this calibration is a pair of accurate voltage references that provide supply- and ...

Page 11

PRODUCT OVERVIEW The AD8310 has six main amplifier/limiter stages. These six cells and their and associated g styled full-wave detectors m handle the lower two-thirds of the dynamic range. Three top- end detectors, placed at 14.3 dB taps on a ...

Page 12

AD8310 S 6kΩ COM 2kΩ 6kΩ INHI 8 TOP-END C 4kΩ ~3kΩ D DETECTORS INLO 1 TYP 2.2V FOR SUPPLY, 3. COM S 2 COMM Figure 24. Signal Input Interface Occasionally, it might ...

Page 13

For zero-signal conditions, all the detector output currents are equal. For a finite input of either polarity, their difference is converted by the output interface to a single-sided unipolar current, nominally scaled 2 µA/dB (40 µA/decade), at the output pin ...

Page 14

AD8310 USING THE AD8310 The AD8310 has very high gain and bandwidth. Consequently susceptible to all signals that appear at the input terminals within a very broad frequency range. Without the benefit of filtering, these are indistinguishable from ...

Page 15

DYNAMIC RANGE 3 2 ±1dB DYNAMIC RANGE 1 0 –1 –2 –3 –4 –5 –120 –100 –80 –60 –40 (–87dBm) INPUT LEVEL (dBV) Figure 30. Log Conformance Errors vs. Input Level at 10 MHz, 50 MHz, and ...

Page 16

AD8310 NARROW-BAND MATCHING Transformer coupling is useful in broadband applications. However, a magnetically coupled transformer might not be convenient in some situations. Table 5 lists narrow-band matching values. Table 5. Narrow-Band Matching Values (MHz) ...

Page 17

Step 4: Calculate L M The matching inductor required to provide both L the parallel combination of these With L = 1.8 µH and L = ...

Page 18

AD8310 OUTPUT FILTERING For applications in which maximum video bandwidth and, consequently, fast rise time are desired essential that the BFIN pin be left unconnected and free of any stray capacitance. The nominal output video bandwidth of 25 ...

Page 19

APPLICATIONS The AD8310 is highly versatile and easy to use. It needs only a few external components, most of which can be immediately accommodated using the simple connections shown in the Using the AD8310 section. A few examples of more ...

Page 20

AD8310 EVALUATION BOARD An evaluation board is available, which has been carefully laid out and tested to demonstrate the specified high speed performance of the AD8310. Figure 40 shows the schematic of the evaluation board, which follows the basic connections ...

Page 21

Preliminary Technical Data Table 6. Evaluation Boards Setup Options Component Function TP1, TP2 Supply and Ground Vector Pins. SW1 Device Enable. When in Position A, the ENBL pin is connected to +V operating mode. In Position B, the ENBL pin ...

Page 22

... AD8310 OUTLINE DIMENSIONS ORDERING GUIDE Model Temperature Range AD8310ARM −40°C to +85°C AD8310ARM-REEL7 −40°C to +85°C 1 AD8310ARMZ-REEL −40°C to +85°C 1 AD8310ARMZ-REEL7 −40°C to +85°C AD8310-EVAL Pb-free part. 3.00 BSC 8 5 4.90 3.00 BSC BSC 1 4 PIN 1 0.65 BSC 1.10 MAX 0.15 0.00 8° ...

Page 23

Preliminary Technical Data NOTES Rev Page AD8310 ...

Page 24

AD8310 NOTES © 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C01084–0–10/04(D) Preliminary Technical Data Rev Page ...

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