High Speed, Video
Difference Amplifier
AD830
FEATURES
CONNECTION DIAGRAM
Differential Amplification
8-Lead Plastic PDIP (N),
CERDIP (Q) and SOIC (RN) Packages
Wide Common-Mode Voltage Range: +12.8 V, –12 V
Differential Voltage Range: ꢀ2 V
High CMRR: 60 dB @ 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/ꢁs Slew Rate
Symmetrical Dynamic Response
Excellent Video Specifications
Differential Gain Error: 0.06%
Differential Phase Error: 0.08ꢂ
15 MHz (0.1 dB) Bandwidth
AD830
X1
X2
Y1
Y2
1
2
3
4
8
7
6
5
V
P
G
M
OUT
NC
A = 1
G
C
M
V
N
NC = NO CONNECT
Flexible Operation
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 com-
mon-mode rejection. In many respects, it offers significant
improvements over discrete difference amplifier approaches, in
particular in high frequency common-mode rejection.
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
APPLICATIONS
Differential Line Receiver
High Speed Level Shifter
High Speed In-Amp
Differential to Single-Ended Conversion
Resistorless Summation and Subtraction
High Speed A/D Driver
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 solu-
tions. Low distortion is preserved over the many possible
differential and common-mode voltages at the input and output.
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.
GENERAL DESCRIPTION
The AD830 is a wideband, differencing amplifier designed for
use at video frequencies but also useful in many other applica-
tions. It accurately amplifies a fully differential signal at the
110
100
90
9
V
R
= ꢀ5V
= 150ꢃ
S
6
L
3
0
C
= 33pF
L
80
–3
–6
V
S
= ꢀ15V
C
= 4.7pF
L
70
–9
–12
–15
–18
60
50
V
S
= ꢀ5V
C
= 15pF
L
40
30
–21
10k
100k
1M
10M
100M
1G
1k
10k
100k
1M
10M
FREQUENCY – Hz
FREQUENCY – Hz
Figure 1. Common-Mode Rejection Ratio vs. Frequency
REV. B
Figure 2. Closed-Loop Gain vs. Frequency, Gain = +1
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