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参数资料
| 型号： | AD8883B |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | 60 MHz, 2000 V/us Monolithic Op Amp |
| 中文描述： | 60兆赫，2000年第V /我们单片运算放大器 |
| 文件页数： | 12/16页 |
| 文件大小： | 258K |
| 代理商： | AD8883B |
REV. D
AD844
–12–
Figure 13. DAC Amplifier Full-Scale Transient Response
20 MHz Variable Gain Amplifier
The AD844 is an excellent choice as an output amplifier for the
AD539 multiplier, in all of its connection modes. (See AD539
data sheet for full details.) Figure 14 shows a simple multiplier
providing the output:
V
W
=
–
V
X
V
Y
2
V
where
V
X
is the
“
gain control
”
input, a positive voltage of from
0 V to 3.2 V (max) and
V
Y
is the
“
signal voltage,
”
nominally
±
2 V FS but capable of operation up to
±
4.2 V. The peak out-
put in this configuration is thus
±
6.7 V. Using all four of the
internal application resistors provided on the AD539 in parallel
results in a feedback resistance of 1.5 k
, at which value the
bandwidth of the AD844 is about 22 MHz, and is essentially
independent of V
X
. The gain at V
X
= 3.16 V is +4 dB.
INPUTS
V
X
0 TO 3V
V
Y
2V FS
3nF
I/P
GND
0.22 F
TOP VIEW
(Not to Scale)
AD539
16
1
8
9
AD844
10
0.22 F
0.22 F
10
0.22 F
TYP+6V
@15 A
+V
S
10
TYP+6V
@15 A
–
V
S
10
V
W
=
2V
–
V
X
V
Y
OUTPUT
V
W
*
V
AND V
INPUTS MAY OPTIONALLY
BE TERMINATED
–
TYPICALLY BY USING
A 50
OR 75
RESISTOR TO GROUND.
Figure 14. 20 MHz VGA Using the AD539
Figure 15 shows the small signal response for a 50 dB gain
control range (V
X
= 10 mV to 3.16 V). At small values of V
X
,
capacitive feedthrough on the PC board becomes troublesome,
and very careful layout techniques are needed to minimize this
problem. A ground strip between the pins of the AD539 will be
helpful in this regard. Figure 16 shows the response to a 2 V
pulse on V
Y
for V
X
= 1 V, 2 V, and 3 V. For these results, a load
resistor of 500
was used and the supplies were
±
9 V. The
multiplier will operate from supplies between
±
4.5 V and
±
16.5 V.
Disconnecting Pins 9 and 16 on the AD539 alters the denomi-
nator in the above expression to 1 V, and the bandwidth will be
approximately 10 MHz, with a maximum gain of 10 dB. Using
only Pin 9 or Pin 16 results in a denominator of 0.5 V, a band-
width of 5 MHz and a maximum gain of 16 dB.
TOP VIEW
(Not to Scale)
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
AD568
+15V
REFCOM
–
15V
I
BPD
I
OUT
R
L
ACOM
LCOM
SPAN
SPAN
THCOM
V
TH
DIGITAL
INPUTS
+15V
–
15V
V
OUT
ANALOG
SUPPLY
GROUND
DIGITAL
SUPPLY
GROUND
–
5V
100pF
*
0.22 F
POWER SUPPLY
BYPASS CAPACITORS
R
I
AD844
MSB
LSB
*
*
*
*
Figure 12. High Speed DAC Amplifier
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