Data Sheet
FEATURES
Simple: basic function is W = XY + Z
Complete: minimal external components required
Very fast: Settles to 0.1% of full scale (FS) in 20 ns
DC-coupled voltage output simplifies use
High differential input impedance X, Y, and Z inputs
Low multiplier noise: 50 nV/√Hz
250 MHz, Voltage Output,
4-Quadrant Multiplier
AD835
FUNCTIONAL BLOCK DIAGRAM
X1
X2
XY
+
Y1
00883-001
X = X1 – X2
AD835
XY + Z
+
X1
W OUTPUT
Y2
Y = Y1 – Y2
Z INPUT
APPLICATIONS
Very fast multiplication, division, squaring
Wideband modulation and demodulation
Phase detection and measurement
Sinusoidal frequency doubling
Video gain control and keying
Voltage-controlled amplifiers and filters
Figure 1.
GENERAL DESCRIPTION
The
AD835
is a complete four-quadrant, voltage output analog
multiplier, fabricated on an advanced dielectrically isolated
complementary bipolar process. It generates the linear product
of its X and Y voltage inputs with a −3 dB output bandwidth of
250 MHz (a small signal rise time of 1 ns). Full-scale (−1 V to
+1 V) rise to fall times are 2.5 ns (with a standard R
L
of 150 Ω),
and the settling time to 0.1% under the same conditions is
typically 20 ns.
Its differential multiplication inputs (X, Y) and its summing
input (Z) are at high impedance. The low impedance output
voltage (W) can provide up to ±2.5 V and drive loads as low as
25 Ω. Normal operation is from ±5 V supplies.
Though providing state-of-the-art speed, the
AD835
is simple
to use and versatile. For example, as well as permitting the
addition of a signal at the output, the Z input provides the
means to operate the
AD835
with voltage gains up to about ×10.
In this capacity, the very low product noise of this multiplier
(50 nV/√Hz) makes it much more useful than earlier products.
The
AD835
is available in an 8-lead PDIP package (N) and an
8-lead SOIC package (R) and is specified to operate over the
−40°C to +85°C industrial temperature range.
PRODUCT HIGHLIGHTS
1.
2.
3.
4.
5.
The
AD835
is the first monolithic 250 MHz, four-quadrant
voltage output multiplier.
Minimal external components are required to apply the
AD835
to a variety of signal processing applications.
High input impedances (100 kΩ||2 pF) make signal source
loading negligible.
High output current capability allows low impedance loads
to be driven.
State-of-the-art noise levels achieved through careful
device optimization and the use of a special low noise,
band gap voltage reference.
Designed to be easy to use and cost effective in applications
that require the use of hybrid or board-level solutions.
6.
Rev. E
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AD835* PRODUCT PAGE QUICK LINKS
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•
AD835 Material Declaration
•
PCN-PDN Information
•
Quality And Reliability
•
Symbols and Footprints
DOCUMENTATION
Application Notes
•
AN-213: Low Cost, Two-Chip, Voltage -Controlled
Amplifier and Video Switch
Data Sheet
•
AD835: 250 MHz, Voltage Output 4-Quadrant Multiplier
Data Sheet
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•
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AD835
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Pin Configuration and Function Descriptions ............................. 6
Data Sheet
Typical Performance Characteristics ..............................................7
Theory of Operation ...................................................................... 10
Basic Theory ............................................................................... 10
Scaling Adjustment .................................................................... 10
Applications Information .............................................................. 11
Multiplier Connections ............................................................. 11
Wideband Voltage-Controlled Amplifier ............................... 11
Amplitude Modulator ................................................................ 11
Squaring and Frequency Doubling .......................................... 12
Outline Dimensions ....................................................................... 13
Ordering Guide .......................................................................... 14
REVISION HISTORY
12/14—Rev. D to Rev. E
Changes to Figure 1 .......................................................................... 1
Changes to Figure 20 ...................................................................... 10
Changes to Wideband Voltage-Controlled Amplifier Section
and Figure 21 ................................................................................... 11
Changes to Ordering Guide .......................................................... 14
12/10—Rev. C to Rev. D
Changes to Figure 1 .......................................................................... 1
Changes to Absolute Maximum Ratings and Table 2 .................. 5
Added Figure 19, Renumbered Subsequent Tables .................... 10
Added Figure 23.............................................................................. 11
10/09—Rev. B to Rev. C
Updated Format .................................................................. Universal
Changes to Figure 22 ...................................................................... 11
Updated Outline Dimensions ....................................................... 13
Changes to Ordering Guide .......................................................... 14
6/03—Rev. A to Rev. B
Updated Format .................................................................. Universal
Updated Outline Dimensions ....................................................... 10
Rev. E | Page 2 of 14
Data Sheet
SPECIFICATIONS
T
A
= 25°C, V
S
= ±5 V, R
L
= 150 Ω, C
L
≤ 5 pF, unless otherwise noted.
Table 1.
Parameter
TRANSFER FUNCTION
INPUT CHARACTERISTICS (X, Y)
Differential Voltage Range
Differential Clipping Level
Low Frequency Nonlinearity
vs. Temperature
Conditions
Min
Typ
Max
AD835
Unit
W
=
V
CM
= 0 V
±1.2
X = ±1 V, Y = 1 V
Y = ±1 V, X = 1 V
T
MIN
to T
MAX 2
X = ±1 V, Y = 1 V
Y = ±1 V, X = 1 V
−2.5
1
(
X
1
−
X
2
)(
Y
1
−
Y
2
)
U
±1
±1.4
0.3
0.1
+
Z
V
V
% FS
% FS
% FS
% FS
V
mV
mV
dB
µA
µA
µA
kΩ
pF
dB
dB
MHz
MHz
V/µs
%
Degrees
%
Degrees
dB
dB
ns
0.5
1
0.3
1
0.7
0.5
+3
±20
1
±25
20
1
27
Common-Mode Voltage Range
Offset Voltage
vs. Temperature
CMRR
Bias Current
vs. Temperature
Offset Bias Current
Differential Resistance
Single-Sided Capacitance
Feedthrough, X
Feedthrough, Y
DYNAMIC CHARACTERISTICS
−3 dB Small Signal Bandwidth
−0.1 dB Gain Flatness Frequency
Slew Rate
Differential Gain Error, X
Differential Phase Error, X
Differential Gain Error, Y
Differential Phase Error, Y
Harmonic Distortion
±3
T
MIN
to T
f ≤ 100 kHz; ±1 V p-p
2
MAX
70
1
10
T
MIN
to T
MAX2
2
100
2
X = ±1 V, Y = 0 V
Y = ±1 V, X = 0 V
150
W = −2.5 V to +2.5 V
f = 3.58 MHz
f = 3.58 MHz
f = 3.58 MHz
f = 3.58 MHz
X or Y = 10 dBm, second and third harmonic
Fund = 10 MHz
Fund = 50 MHz
To 0.1%, W = 2 V p-p
From Z to W, f ≤ 10 MHz
0.990
250
15
1000
0.3
0.2
0.1
0.1
−70
−40
20
0.995
250
60
2
50
50
−46
1
−60
1
Settling Time, X or Y
SUMMING INPUT (Z)
Gain
−3 dB Small Signal Bandwidth
Differential Input Resistance
Single-Sided Capacitance
Maximum Gain
Bias Current
X, Y to W, Z shorted to W, f = 1 kHz
MHz
kΩ
pF
dB
µA
Rev. E | Page 3 of 14
AD835
Parameter
OUTPUT CHARACTERISTICS
Voltage Swing
vs. Temperature
Voltage Noise Spectral Density
Offset Voltage
vs. Temperature
3
Short-Circuit Current
Scale Factor Error
vs. Temperature
Linearity (Relative Error)
4
vs. Temperature
POWER SUPPLIES
Supply Voltage
For Specified Performance
Quiescent Supply Current
vs. Temperature
PSRR at Output vs. VP
PSRR at Output vs. VN
1
2
Data Sheet
Conditions
Min
±2.2
±2.0
Typ
±2.5
50
±25
75
±5
T
MIN
to T
MAX2
±0.5
T
MIN
to T
2
MAX
Max
Unit
V
V
nV/√Hz
mV
mV
mA
% FS
% FS
% FS
% FS
T
MIN
to T
X = Y = 0 V, f < 10 MHz
2
MAX
T
MIN
to T
MAX2
±75
1
±10
±8
1
±9
±1.0
1
±1.25
±4.5
T
MIN
to T
MAX2
+4.5 V to +5.5 V
−4.5 V to −5.5 V
±5
16
±5.5
25
1
26
0.5
1
0.5
V
mA
mA
%/V
%/V
All minimum and maximum specifications are guaranteed. These specifications are tested on all production units at final electrical test.
T
MIN
= −40°C, T
MAX
= 85°C.
3
Normalized to zero at 25°C.
4
Linearity is defined as residual error after compensating for input offset, output voltage offset, and scale factor errors.
Rev. E | Page 4 of 14
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