MHz, Voltage Output 4-Quadrant Multiplier AD835 FUNCTIONAL BLOCK

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MHz, Voltage Output 4-Quadrant Multiplier AD835 FUNCTIONAL BLOCK

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FEATURES Simple: Basic Function Complete: Minimal External Components Required Very Fast: Settles 0.1% DC-Coupled Voltage Output Simplifies High Differential Input Impedance Inputs Multiplier Noise: nV/Hz APPLICATIONS Very Fast Multiplication, Division, Squaring Wideband Modulation Demodulation Phase Detection Measurement Sinusoidal Frequency Doubling Video Gain Control Keying Voltage Controlled Amplifiers Filters
MHz, Voltage Output 4-Quadrant Multiplier AD835
FUNCTIONAL BLOCK DIAGRAM
AD835
OUTPUT
INPUT
PRODUCT DESCRIPTION
PRODUCT HIGHLIGHTS
AD835 complete four-quadrant voltage output analog multiplier fabricated advanced dielectrically isolated complementary bipolar process. generates linear product voltage inputs, with output bandwidth small signal rise time ns). Full-scale rise/fall times (with standard settling time 0.1% under same conditions typically differential multiplication inputs summing input high impedance. impedance output voltage provide drive loads Normal operation from supplies. Though providing state-of-the-art speed, AD835 simple versatile. example, well permitting addition signal output, input provides means operate AD835 with voltage gains about this capacity, very product noise this multiplier nVHz) makes much more useful than earlier products. AD835 available 8-pin plastic mini-DIP package 8-pin SOIC specified operate over -40°C +85°C industrial temperature range.
AD835 first monolithic four quadrant voltage output multiplier. Minimal external components required apply AD835 variety signal processing applications. High input impedances (100 make signal source loading negligible. High output current capability allows impedance loads driven. State noise levels achieved through careful device optimization special noise bandgap voltage reference. Designed easy cost effective applications which formerly required hybrid board level solutions.
REV.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices. Analog Devices, Inc., 1994 Technology Way, P.O. 9106, Norwood. 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703
AD835-SPECIFICATIONS
Model
TRANSFER FUNCTION Parameter INPUT CHARACTERISTICS Differential Voltage Range Differential Clipping Level Frequency Nonlinearity Temperature Common-Mode Voltage Range Offset Voltage Temperature CMRR Bias Current Temperature Offset Bias Current Differential Resistance Single-Sided Capacitance Feedthrough, Feedthrough, DYNAMIC CHARACTERISTICS Small-Signal Bandwidth -0.1 Gain Flatness Frequency Slew Rate Differential Gain Error, Differential Phase Error, Differential Gain Error, Differential Phase Error, Harmonic Distortion Settling Time, SUMMING INPUT Gain Small-Signal Bandwidth Differential Input Resistance Single Sided Capacitance Maximum Gain Bias Current OUTPUT CHARACTERISTICS Voltage Swing Temperature Voltage Noise Spectral Density Offset Voltage Temperature2 Short Circuit Current Scale Factor Error Temperature Linearity (Relative Error)3 Temperature POWER SUPPLIES Supply Voltage Specified Performance Quiescent Supply Current Temperature PSRR Output PSRR Output
unless otherwise noted)
AD835AN/AR
2)(Y1
Conditions TMIN TMAX1 TMIN TMAX1 kHz; TMIN TMAX1
Unit V/µs Degrees Degrees
-2.5
-2.5 +2.5 3.58 3.58 3.58 3.58 dBm, Harmonic Fund Fund 0.1%, From 0.990
1000 0.995 1.25
Shorted
nV/Hz
TMIN TMAX1 TMIN TMAX1 TMIN TMAX1 TMIN TMAX1
TMIN TMAX1 +4.5 +5.5 -4.5 -5.5
NOTES TMIN -40°C, TMAX +85°C. Normalized zero +25°C. Linearity defined residual error after compensating input offset, output voltage offset scale factor errors. specifications guaranteed. Specifications boldface tested production units final electrical test. Specifications subject change without notice.
REV.
AD835
ABSOLUTE MAXIMUM RATINGS
Supply Voltage Internal Power Dissipation2 Operating Temperature Range -40°C +85C Storage Temperature Range -65°C +150°C Lead Temperature, Soldering +300°C Rating 1500
NOTES Stresses above those listed under "Absolute Maximum Ratings" cause permanent damage device. This stress rating only functional operation device these other conditions above those indicated operational sections this specification implied. Exposure absolute maximum ratings extended periods affect device reliability. Thermal Characteristics: 8-Pin Plastic (N): 35°C/W; 90°C/W 8-Pin Plastic SOIC (R): 45°C/W; 115°C/W.
CONNECTIONS 8-Pin Plastic 8-Pin Plastic SOIC
AD835
VIEW (Not Scale)
ORDERING GUIDE
Model AD835AN AD835AR
Temperature Range -40°C +85°C -40°C +85°C
Package Options*
Plastic DIP; Small Outline Plastic Package (SOIC).
Typical Performance Characteristics
(NTSC) FIELD LINE 0.00 0.06 0.11 COMPOSITE 0.16 0.19 0.20
0dBm
DIFFERENTIAL GAIN
-0.2 -0.4 -0.1 -0.2 -0.3 0.00 0.06 0.06
MAGNITUDE
GAIN PHASE -180
0.02
0.02
0.03
0.03
0.06
0.00
DIFFERENTIAL PHASE Degrees
100M FREQUENCY
Figure Typical Composite Output Differential Gain Phase, NTSC Channel; 3.58 MHz,
(NTSC) FIELD LINE 0.00 0.01 -0.00 0.00 COMPOSITE -0.01 -0.20 -0.02 0.01 p-p/MAX 0.03
Figure Gain Phase Frequency Inputs
DIFFERENTIAL GAIN
-0.1 -0.3
OdBm
MAGNITUDE
-0.2 0.00 0.03 0.04 0.07 0.10 0.16
-0.1 -0.2 -0.3 -0.4 -0.5
DIFFERENTIAL PHASE Degrees
0.20 0.10 0.00 -0.10 -0.20 0.00 0.16 0.16
-0.6 300k 100M FREQUENCY
Figure Typical Composite Output Differential Gain Phase, NTSC Channel; 3.58 MHz,
Figure Gain Flatness
REV.
PHASE Degrees
0.00 0.20 p-p/MAX 0.20
AD835
5dBm
MAGNITUDE
FEEDTHROUGH FEEDTHROUGH
FEEDTHROUGH
FEEDTHROUGH
100M FREQUENCY
100M FREQUENCY
Figure Feedthrough Frequency
Figure CMRR Frequency Channel,
0dBm SUPPLY PSRR
PSRR
0.200V
PSRR
-0.200V
100mV
10ns
300k 100M FREQUENCY
Figure Small Signal Pulse Response Output, Channel Channel
Figure PSRR Frequency Supply
10MHz
10dB/DIV
30MHz 20MHz
500mV
10ns
Figure Large Signal Pulse Response Output, Channel Channel
Figure Harmonic Distortion MHz; Input Channels,
REV.
CMRR
AD835
OUTPUT OFFSET DRIFT WILL TYPICALLY WITHIN SHADED AREA
50MHz
OUTPUT DRIFT
10dB/DIV 100MHz 150MHz
OUTPUT DRIFT, NORMALIZED 25°C
TEMPERATURE
Figure Harmonic Distortion MHz, Input Channel,
Figure Output Drift Temperature
ORDER INTERCEPT
100MHz
6dBm 10dBm
200MHz 10dB/DIV
300MHz
FREQUENCY INPUT CHANNEL
Figure Harmonic Distortion MHz, Input Channel,
Figure Fixed Channel Frequency Input Channel
+2.5V
ORDER INTERCEPT
6dBm 10dBm
-2.5V
10ns
FREQUENCY
Figure Maximum Output Voltage Swing,
Figure Fixed Frequency Channel
REV.
AD835
PRODUCT DESCRIPTION
AD835 four-quadrant, voltage output, analog multiplier fabricated advanced, dielectrically isolated, complementary bipolar process. basic mode, provides linear product voltage inputs. this mode, output voltage bandwidth small signal rise time ns). Full-scale rise/fall times (with standard settling time 0.1% under same conditions typically earlier multipliers from Analog Devices, unique summing feature provided Z-input. well providing independent ground references inputs output, enhanced versatility, this feature allows AD835 operate with voltage gain. Z-input voltages nominally with overrange least 20%. inputs fully differential high impedance (100 provide CMRR MHz). impedance output capable driving loads small peak output large minimum minimum into AD835 much lower noise than AD534 AD734, making attractive level signal-processing applications, example, wideband gain-control element modulator.
Basic Theory
Simplified representations this sort, where signals presumed expressed volts, used throughout this data sheet, avoid needless less-intuitive subscripted variables (such VX1). view variables being normalized example, input either stated being range simply latter representation will found facilitate development functions using AD835. explicit inclusion denominator, also less helpful, case AD835, electrical input variable.
Scaling Adjustment
basic value Equation nominally 1.05 Figure which shows basic multiplier connections, also shows effective value adjusted have lower voltage (usually through resistive-divider between (Pin (Pin Using general resistor values shown, rewrite Equation
(where distinguished from signal follows that this way, modify effective value
multiplier based classic form, having translinear core, supported three linearized voltage-to-current converters, load driving output amplifier. scaling voltage (the denominator equations below) provided bandgap reference novel design, optimized ultralow noise. Figure shows functional block diagram. general terms, AD835 provides function
without altering scaling input. (This expected, since only "ground reference" output through input.) Thus, remembering that basic value 1.05 need choose have nominal value times values shown here allow adjusted through nominal range 0.95 1.05 that provides gain adjustment.
4.7µF TANTALUM
2)(Y
where variables voltages. Connected simple multiplier, with with scale factor adjustment (see below) which sets output expressed
0.01µF CERAMIC (1-k)
AD835
AD835
OUTPUT
4.7µF TANTALUM
0.01µF CERAMIC
INPUT
Figure Functional Block Diagram
Figure Multiplier Connections
Note that many applications, exact gain multiplier very important; which case, this network omitted entirely, fixed
REV.
AD835
APPLICATIONS
AD835 both easy versatile. capability adding another signal output input frequently valuable. Three applications this feature presented here: wideband voltage controlled amplifier, amplitude modulator frequency doubler. course, AD835 also used square detector (with Y-inputs connected parallel) which mode useful input frequencies well over MHz, since that bandwidth limitation only output amplifier.
Multiplier Connections
12dB
0.5V)
0.25V)
Figure shows basic connections multiplication. inputs will often single sided, which case inputs will normally grounded. Note that assigning Pins these (inverting) inputs, respectively, extra measure isolation between inputs output provided. inputs may, course, reversed achieve some desired overall sign with inputs particular polarity, they driven fully differentially. Power supply decoupling careful board layout always important applying wideband circuits. decoupling recommendations shown Figure should followed closely. remaining figures this data sheet, these power supply decoupling components have been omitted clarity, should used wherever optimal performance with high speed inputs required. However, they omitted full high frequency capabilities AD835 being exploited.
Wideband Voltage Controlled Amplifier
100k START 000.000Hz
100M STOP 000.000Hz
Figure Response
Amplitude Modulator
Figure shows simple modulator. carrier applied both Y-input Z-input, while modulating signal applied X-input. zero modulation, there product term, carrier input simply replicated unity gain voltage follower action from Z-input. output doubled, while fully suppressed. That X-input approximately (actually about 1.05 corresponds modulation index 100%. Carrier modulation frequencies MHz, somewhat beyond nominal bandwidth. course, suppressed carrier modulator implemented omitting feedforward Z-input, grounding that instead.
MODULATION INPUT MODULATED CARRIER OUTPUT
Figure shows AD835 configured provide gain nominally fact, control range extends from well under about dB.) gain nominally attendant bandwidth reduction that comes with this increased gain partially offset addition peaking capacitor Although this circuit shows dual supplies, AD835 operate from single supply with slight revision.
(GAIN CONTROL) (SIGNAL) 97.6 33pF VOLTAGE OUTPUT
AD835
CARRIER OUTPUT
AD835
Figure Simple Amplitude Modulator Using AD835
Squaring Frequency Doubling
Amplitude domain squaring input signal, achieved simply connecting Y-inputs parallel produce output E2/U. input have either polarity, output this case will always positive. output polarity reversed interchanging either inputs. When input sine wave signal squarer behaves frequency doubler, since While useful, Equation shows term output which will vary strongly with amplitude input,
Figure Voltage Controlled Amplifier Using AD835
response this amplifier gains 0.25 shown Figure this application, resistor values have been slightly adjusted reflect nominal value 1.05 overall sign gain controlled sign
REV.
AD835
Figure shows frequency doubler which overcomes this limitation provides relatively constant output over moderately wide frequency range, determined time-constant voltage applied Y-inputs exactly quadrature frequency C1R1 their amplitudes equal. higher frequencies, X-input becomes smaller while Y-input increases amplitude; opposite happens lower frequencies. result double frequency output, centered ground, whose amplitude input varies only 0.5% over frequency range 10%. Because there "squared" component output, sudden changes input amplitude cause "bounce" level.
VOLTAGE OUTPUT 97.6
0.022 (0.558) 0.014 (0.356) 0.100 (2.54) 0.070 (1.77) 0.045 (1.15) SEATING PLANE
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
8-Pin Plastic Package)
C1903a-3-12/94
0.325 (8.25) 0.300 (7.62) 0.060 (1.52) 0.015 (0.38) 0.195 (4.95) 0.115 (2.93) 0.015 (0.381) 0.008 (0.204)
0.280 (7.11) 0.240 (6.10)
0.430 (10.92) 0.348 (8.84) 0.210 (5.33) 0.160 (4.06) 0.115 (2.93)
0.130 (3.30)
AD835
8-Pin Plastic SOIC Package)
0.1574 (4.00) 0.1497 (3.80)
Figure Broadband "Zero-Bounce" Frequency Doubler
This circuit based identity
0.2440 (6.20) 0.2284 (5.80)
0.0098 (0.25) 0.0040 (0.10)
0.1968 (5.00) 0.1890 (4.80) 0.102 (2.59) 0.094 (2.39) 0.0500 (1.27) 0.0192 (0.49) 0.0138 (0.35)
0.0196 (0.50) 0.0099 (0.25)
1/C1R1, input leads input signal (and attenuated while input lags input signal 45°, also attenuated Since inputs phase, response circuit will
0.0098 (0.25) 0.0075 (0.19)
0.0500 (1.27) 0.0160 (0.41)
(sin (sin (sin
REV.
PRINTED U.S.A.
which component, included restore output input amplitude (the same gain adjustment mentioned earlier). Because voltage across capacitor, decreases with frequency, while that across resistor, increases, amplitude output varies only slightly with frequency. fact, only 0.5% below full value center frequency 1/C1R1) 110% this frequency.

MHz, Voltage Output 4-Quadrant Multiplier AD835 FUNCTIONAL BLOCK

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