High Speed, Video
Difference Amplifier
AD830
Rev. C
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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
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
CONNECTION DIAGRAM
AD830
1
2
3
4
8
7
6
5
C
G
M
G
M
X1
X2
Y1
Y2
V
P
OUT
NC
V
N
NC = NO CONNECT
00881-001
A = 1
Figure 1. 8-Lead Plastic PDIP (N), CERDIP (Q), and SOIC (RN) Packages
FREQUENCY (Hz)
CMRR (dB)
110
30
10M
50
40
1k
70
60
80
90
100
1M100k10k
V
S
= ±5V
V
S
= ±15V
00881-002
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.
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.
9
–6
–21
10k 100k 1M 10M 100M 1G
–3
0
3
6
–18
–15
–12
–9
FREQUENCY (Hz)
GAIN (dB)
V
S
= ±5V
R
L
= 150Ω
C
L
= 33pF
C
L
= 4.7pF
C
L
= 15pF
0881-003
Figure 3. Closed-Loop Gain vs. Frequency, Gain = +1
