AD813 datasheet(16/19 Pages) AD

16 / 19 page

AD813

REV. B

–16–

High Performance Video Line Driver

At a gain of +2, the AD813 makes an excellent driver for a back

terminated 75

Ω video line. Low differential gain and phase

errors and wide 0.1 dB bandwidth can be realized over a wide

range of power supply voltage. Excellent gain and group delay

matching are also attainable over the full operating supply volt-

age range.

AD813

VIN

VOUT

+VS

0.1 F

–VS

CABLE

Figure 46. A Video Line Driver Operating at a Gain of

+2 (RF = RG from Table I)

G = +2

RL = 150

1000

100

FREQUENCY – MHz

–1

–6

–2

–3

–4

–5

+90

–90

–180

–270

PHASE

GAIN

VS = 15V

Figure 47. Closed-Loop Gain & Phase vs. Frequency for

the Line Driver

216

SUPPLY VOLTAGE – Volts

100

110

120

NO PEAKING

RF = 590

RF = 681

RF = 750

Figure 48. –3 dB Bandwidth vs. Supply Voltage for

Gain = +2, RL = 150

Ω

100k

100M

10M

FREQUENCY – Hz

0.2

0.1

–0.1

–0.2

–0.3

–0.4

–0.5

15V

G = +2

RL = 150

Figure 49. Fine-Scale Gain (Normalized) vs. Frequency

1000

100

FREQUENCY – MHz

1.0

0.5

–0.5

–1.0

–1.5

–2.0

1.5

2.0

–2.5

2.5

VS = 15V

VS = 3V

G = +2

RL = 150

Figure 50. Closed-Loop Gain Matching vs. Frequency

100k

100M

10M

FREQUENCY – Hz

1.0

0.5

–0.5

–1.0

S =

15V

S = 3V

DELAY

DELAY MATCHING

15V

Figure 51. Group Delay and Group Delay Matching vs.

Frequency, G = +2, RL = 150 Ω

Figures 50 and 51 show the worst case matching; the match

between amplifiers 2 and 3 is typically much better than this.

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