Datasheet AD828 (Analog Devices) - 12

AD828 LOW DISTORTION LINE DRIVER 1.1k
The AD828 can quickly be turned into a powerful, low distor-
+VS
tion line driver (see Figure 10). In this arrangement, the AD828
1k 1 F
can comfortably drive a 75 Ω back-terminated cable with a 5 MHz, 2 V p-p input, while achieving the harmonic distortion
0.1 F
performance outlined in the following table.
2 8 1/2 Configuration 2nd Harmonic 1 AD828 3
1. No Load –78.5 dBm
RC 7.5 1k
2. 150 Ω RL Only –63.8 dBm
1k
3. 150 Ω RL 7.5 Ω RC –70.4 dBm
6 RL 75 1/2
C00879–0–6/02(C) In this application, one half of the AD828 operates at a gain of +2.1
VIN AD828 7
and supplies the current to the load, while the other provides the
5 4 75
overall system gain of +2. This is important for two reasons: the
1 F
first is to keep the bandwidth of both amplifiers the same, and
75 0.1 F
the second is to preserve the AD828’s ability to operate from low supply voltage. R
–V
C varies with the load and must be chosen to
S
satisfy the following equation: Figure 10. Low Distortion Amplifier RC = MRL where M is defined by [(M + 1) GS = GD] and GD = Driver’s Gain, GS = System Gain.
OUTLINE DIMENSIONS 8-Lead Plastic Dual-in-Line Package [PDIP] 8-Lead Standard Small Outline Package [SOIC] (N-8) (R-8)
Dimensions shown in inches and (millimeters) Dimensions shown in millimeters and (inches)
0.4299 (10.92) 5.00 (0.1968) 0.3480 (8.84) 4.80 (0.1890) 8 5 8 5 0.2799 (7.11) 0.1574 (4.00) 6.20 (0.2440) 0.2402 (6.10) 0.1497 (3.80) 1 4 5.80 (0.2284) 1 4 PIN 1 0.3248 (8.25) PIN 1 0.1000 (2.54) 0.3000 (7.62) 1.27 (0.0500) 0.50 (0.0196) BSC 45 BSC 0.25 (0.0099) 0.2098 0.0598 (1.52) 0.1949 (4.95) COPLANARITY 1.75 (0.0688) (5.33) 0.0150 (0.38) 0.1154 (2.93) 0.25 (0.0098) 1.35 (0.0532) MAX 0.1299 0.10 (0.0040) 8 0.1598 (4.06) (3.30) 0.0150 (0.38) 0.51 (0.0201) 0.25 (0.0098) 0 1.27 (0.0500) SEATING 0.1154 (2.93) MIN 0.0079 (0.20) PLANE 0.33 (0.0130) 0.19 (0.0075) 0.41 (0.0160) 0.0220 (0.56) SEATING 0.0697 (1.77) CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS 0.0142 (0.36) PLANE 0.0453 (1.15) (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
PRINTED IN U.S.A.
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 –12– REV. C