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High Speed, Video
Difference Amplifier
AD830
FEATURES
Differential amplification
Wide common-mode voltage range: +12.8 V to −12 V
Differential voltage: ±2 V
High CMRR: 60 dB at 4 MHz
Built-in differential clipping level: ±2.3 V
Fast dynamic performance
85 MHz unity gain bandwidth
35 ns settling time to 0.1%
360 V/μs slew rate
Symmetrical dynamic response
Excellent video specifications
Differential gain error: 0.06%
Differential phase error: 0.08°
15 MHz (0.1 dB) bandwidth
Flexible operation
High output drive of ±50 mA min
Specified with both ±5 V and ±15 V supplies
Low distortion: THD = −72 dB @ 4 MHz
Excellent DC performance: 3 mV max input
Offset voltage
CONNECTION DIAGRAM
X1
X2
Y1
Y2
1
2
A=1
3
4
G
M
C
6
AD830
G
M
8
V
P
OUT
NC
00881-001
7
5
V
N
NC = NO CONNECT
Figure 1. 8-Lead Plastic PDIP (N), CERDIP (Q), and SOIC (RN) Packages
110
100
90
80
70
60
V
S
= ±5V
50
40
30
1k
10k
100k
FREQUENCY (Hz)
1M
10M
CMRR (dB)
V
S
= ±15V
APPLICATIONS
Differential line receiver
High speed level shifter
High speed in-amp
Differential to single-ended conversion
Resistorless summation and subtraction
High speed analog-to-digital converter
Figure 2. Common-Mode Rejection Ratio vs. Frequency
Good gain flatness and excellent differential gain of 0.06% and
phase of 0.08° make the AD830 suitable for many video system
applications. Furthermore, the AD830 is suited for general-purpose
signal processing from dc to 10 MHz.
9
6
3
C
L
= 33pF
0
V
S
= ±5V
R
L
= 150Ω
GENERAL DESCRIPTION
The AD830 is a wideband, differencing amplifier designed for use
at video frequencies but also useful in many other applications. It
accurately amplifies a fully differential signal at the input and
produces an output voltage referred to a user-chosen level. The
undesired common-mode signal is rejected, even at high
frequencies. High impedance inputs ease interfacing to finite
source impedances and, thus, preserve the excellent common-
mode rejection. In many respects, it offers significant
improvements over discrete difference amplifier approaches, in
particular in high frequency common-mode rejection.
The wide common-mode and differential voltage range of the
AD830 make it particularly useful and flexible in level shifting
applications but at lower power dissipation than discrete solutions.
Low distortion is preserved over the many possible differential and
common-mode voltages at the input and output.
Rev. C
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.
GAIN (dB)
–3
C
L
= 4.7pF
–6
–9
–12
C
L
= 15pF
–15
–18
00881-003
–21
10k
100k
1M
10M
100M
1G
FREQUENCY (Hz)
Figure 3. Closed-Loop Gain vs. Frequency, Gain = +1
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2005–2010 Analog Devices, Inc. All rights reserved.
00881-002
AD830
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Connection Diagram ....................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 7
Maximum Power Dissipation ..................................................... 7
Thermal Resistance ...................................................................... 7
ESD Caution .................................................................................. 7
Typical Performance Characteristics ............................................. 8
Theory of Operation ...................................................................... 11
Traditional Differential Amplification .................................... 11
Problems With the Op Amp Based Approach ....................... 11
AD830 for Differential Amplification ..................................... 11
Advantageous Properties of the AD830 .................................. 11
Understanding the AD830 Topology ...................................... 11
Interfacing the Input .................................................................. 12
Supplies, Bypassing, and Grounding (Figure 34)................... 14
AC-Coupled Line Receiver ....................................................... 17
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 20
REVISION HISTORY
3/10—Rev. B to Rev. C
Updated Format .................................................................. Universal
Changes to Ordering Guide .......................................................... 20
1/03—Rev. A to Rev. B.
Updated Ordering Guide ................................................................ 4
Change to Figure 30 ...................................................................... 14
Updated Outline Dimensions ..................................................... 15
Rev. C | Page 2 of 20
AD830
SPECIFICATIONS
V
S
= ±15 V, R
LOAD
= 150 Ω, C
LOAD
= 5 pF, T
A
= 25°C, unless otherwise noted.
Table 1.
Parameter
DYNAMIC CHARACTERISTICS
3 dB Small Signal Bandwidth
0.1 dB Gain Flatness
Frequency
Differential Gain Error
Differential Phase Error
Slew Rate
3 dB Large Signal Bandwidth
Settling Time, Gain = +1
Harmonic Distortion
Input Voltage Noise
Input Current Noise
DC PERFORMANCE
Offset Voltage
Open-Loop Gain
Gain Error
Peak Nonlinearity, R
L
= 1 kΩ,
Gain = +1
Input Bias Current
Input Offset Current
INPUT CHARACTERISTICS
Differential Voltage Range
Differential Clipping Level
2
Common-Mode Voltage
Range
CMRR
Conditions
Gain = +1, V
OUT
= 100 mV rms
Gain = +1, V
OUT
= 100 mV rms
0 V to 0.7 V, frequency =
4.5 MHz
0 V to 0.7 V, frequency =
4.5 MHz
2 V step, R
L
= 500 Ω
4 V step, R
L
= 500 Ω
Gain = +1, V
OUT
= 1 V rms
V
OUT
= 2 V step, to 0.1%
V
OUT
= 4 V step, to 0.1%
2 V p-p, frequency = 1 MHz
2 V p-p, frequency = 4 MHz
frequency = 10 kHz
AD830J/AD830A
Min
Typ
Max
75
11
85
15
0.06
0.08
360
350
45
25
35
−82
−72
27
1.4
±1.5
64
69
±0.1
0.01
0.035
0.15
5
7
0.1
±2.0
±2.3
+12.8
100
±3
±5
64
±0.6
0.03
0.07
0.4
10
13
1
0.09
0.12
Min
75
11
AD830S
1
Typ
85
15
0.06
0.08
360
350
45
25
35
−82
−72
27
1.4
±1.5
69
±0.1
0.01
0.035
0.15
5
8
0.1
±2.0
±2.3
+12.8
100
±3
±7
±0.6
0.03
0.07
0.4
10
17
1
0.09
0.12
Max
Unit
MHz
MHz
%
Degrees
V/μs
V/μs
MHz
ns
ns
dBc
dBc
nV/√Hz
pA/√Hz
mV
mV
dB
%
% FS
% FS
% FS
μA
μA
μA
V
V
V
dB
dB
dB
kΩ
pF
V
V
mA
mA
38
38
Gain = +1
Gain = +1, T
MIN
− T
MAX
DC
R
L
= 1 kΩ, G = ±1
−1 V ≤ X ≤ +1 V
−1.5 V ≤ X ≤ +1.5 V
−2 V ≤ X ≤ +2 V
V
IN
= 0 V, 25°C to T
MAX
V
IN
= 0 V, T
MIN
V
IN
= 0 V, T
MIN
− T
MAX
V
CM
= 0
Pin 1 and Pin 2 inputs only
V
DM
= ±1 V
DC, Pin 1/Pin 2, ±10 V
DC, Pin 1/Pin 2, ±10 V,
T
MIN
− T
MAX
Frequency = 4 MHz
±2.1
−12.0
90
88
55
±2.1
−12.0
90
86
55
Input Resistance
Input Capacitance
OUTPUT CHARACTERISTICS
Output Voltage Swing
Short-Circuit Current
Output Current
60
370
2
+13.8/−13.8
+15.3/−14.7
±80
60
370
2
+13.8/−13.8
+15.3/−14.7
±80
R
L
≥ 1 kΩ
R
L
≥ 1 kΩ, ±16.5 V
S
Short to ground
R
L
= 150 Ω
±12
±13
±50
±12
±13
±50
Rev. C | Page 3 of 20
AD830
Parameter
POWER SUPPLIES
Operating Range
Quiescent Current
+PSRR (to V
P
)
−PSRR (to V
N
)
PSRR
PSRR
Conditions
AD830J/AD830A
Min
Typ
Max
±4
T
MIN
– T
MAX
DC, G = +1
DC, G = +1
DC, G = +1, ±5 to ±15 V
S
DC, G = +1, ±5 to ±15 V
S
T
MIN
− T
MAX
14.5
86
68
71
68
±16.5
17
Min
±4
14.5
86
68
71
68
AD830S
1
Typ
Max
±16.5
17
Unit
V
mA
dB
dB
dB
dB
66
62
66
60
1
2
See the Standard Military Drawing 5962-9313001MPA for specifications.
Clipping level function on X channel only.
Rev. C | Page 4 of 20
