C00879–0–6/02(C)
PRINTED IN U.S.A.
–12–
AD828
REV. C
Revision History
Location Page
6/02–Data Sheet changed from REV. B to REV. C.
Renumbered Figures and TPCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Global
Changes to Figure 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
LOW DISTORTION LINE DRIVER
The AD828 can quickly be turned into a powerful, low distor-
tion line driver (see Figure 10). In this arrangement, the AD828
can comfortably drive a 75 Ω back-terminated cable with a
5 MHz, 2 V p-p input, while achieving the harmonic distortion
performance outlined in the following table.
Configuration 2nd Harmonic
1. No Load –78.5 dBm
2. 150 Ω R
L
Only –63.8 dBm
3. 150 Ω R
L
7.5 Ω R
C
–70.4 dBm
In this application, one half of the AD828 operates at a gain of +2.1
and supplies the current to the load, while the other provides the
overall system gain of +2. This is important for two reasons: the
first is to keep the bandwidth of both amplifiers the same, and
the second is to preserve the AD828’s ability to operate from low
supply voltage. R
C
varies with the load and must be chosen to
satisfy the following equation:
RC = MR
L
where M is defined by [(M + 1) G
S
= G
D
] and G
D
= Driver’s
Gain, G
S
= System Gain.
+V
S
1.1k
R
L
R
C
7.5
75
75
75
0.1F
1/2
AD828
1
8
1F
1k
–V
S
1k
V
IN
1/2
AD828
6
5
7
1k
0.1F
1F
4
3
2
Figure 10. Low Distortion Amplifier
OUTLINE DIMENSIONS
8-Lead Plastic Dual-in-Line Package [PDIP]
(N-8)
Dimensions shown in inches and (millimeters)
SEATING
PLANE
0.0598 (1.52)
0.0150 (0.38)
0.2098
(5.33)
MAX
0.0220 (0.56)
0.0142 (0.36)
0.1598 (4.06)
0.1154 (2.93)
0.0697 (1.77)
0.0453 (1.15)
0.1299
(3.30)
MIN
8
1
4
5
PIN 1
0.2799 (7.11)
0.2402 (6.10)
0.1000 (2.54)
BSC
0.4299 (10.92)
0.3480 (8.84)
0.1949 (4.95)
0.1154 (2.93)
0.0150 (0.38)
0.0079 (0.20)
0.3248 (8.25)
0.3000 (7.62)
8-Lead Standard Small Outline Package [SOIC]
(R-8)
Dimensions shown in millimeters and (inches)
0.25 (0.0098)
0.19 (0.0075)
1.27 (0.0500)
0.41 (0.0160)
0.50 (0.0196)
0.25 (0.0099)
45
8
0
1.75 (0.0688)
1.35 (0.0532)
SEATING
PLANE
0.25 (0.0098)
0.10 (0.0040)
85
41
5.00 (0.1968)
4.80 (0.1890)
PIN 1
0.1574 (4.00)
0.1497 (3.80)
1.27 (0.0500)
BSC
6.20 (0.2440)
5.80 (0.2284)
0.51 (0.0201)
0.33 (0.0130)
COPLANARITY
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
COMPLIANT TO JEDEC STANDARDS MS-012 AA
