參數(shù)資料
型號(hào)： AD8337BCPZ-REEL
廠商： Analog Devices Inc
文件頁數(shù)： 14/32頁
文件大?。?/td> 0K
描述： IC AMP VGA LOW NOISE 8-LFCSP
標(biāo)準(zhǔn)包裝： 5,000
系列： X-AMP®
類型： 可變?cè)鲆娣糯笃?br>
應(yīng)用： 信號(hào)處理
安裝類型： 表面貼裝
封裝/外殼： 8-VFDFN 裸露焊盤，CSP
供應(yīng)商設(shè)備封裝： 8-LFCSP-VD（3x3）
包裝： 帶卷 (TR)
配用： AD8337-EVALZ-SS-ND - BOARD EVALUATION FOR AD8337 SS
AD8337-EVALZ-INV-ND - BOARD EVALUATION FOR AD8337 INS
AD8337-EVALZ-ND - BOARD EVALUATION FOR AD8337
AD8337
Rev. C | Page 21 of
32
–600
–200
0
600
400
–20
–400
TIME (ns)
–10
30
20
10
50
60
40
80
V
IN
(mV)
–60
0
–20
20
60
40
–40
200
OUTPUT
800
–800
70
80
–80
055
75-
070
V
OU
T
(m
V
)
INPUT
CL = 0pF
CL = 10pF
CL = 22pF
NO SNUBBING RESISTOR
Figure 70. Pulse Response for Two Values of Output Capacitance
with ±2.5 V Supplies and No Snubbing Resistor
CL = 0pF
CL = 10pF
CL = 22pF
WITH 20 SNUBBING RESISTOR
V
OU
T
(m
V)
–600
–200
0
600
400
–20
–400
TIME (ns)
–10
30
20
10
50
60
40
80
V
IN
(m
V)
–60
0
–20
20
60
40
–40
200
INPUT
OUTPUT
800
–800
70
80
–80
05
57
5-
0
71
Figure 71. Pulse Response for Two Values of Output Capacitance
with ±2.5 V Supplies and a 20 Ω Snubbing Resistor
CL = 0pF
CL= 10pF
CL = 22pF
WITH NO SNUBBING RESISTOR
V
OU
T
(m
V
)
–600
–200
0
600
400
–20
–400
TIME (ns)
–10
30
20
10
50
60
40
80
–60
0
–20
20
60
40
–40
200
INPUT
OUTPUT
800
–800
70
–80
80
VS = ±5V
V
IN
(m
V
)
0
557
5-
0
72
Figure 72. Large Signal Pulse Response for Two Values of Output
Capacitance with ±5 V Supplies and No Snubbing Resistor
CL = 0pF
CL = 10pF
CL = 22pF
WITH 20 SNUBBING RESISTOR
V
OU
T(m
V
)
–600
–200
0
600
400
–20
–400
TIME (ns)
–10
30
20
10
50
60
40
80
–60
0
–20
20
60
40
–40
200
INPUT
OUTPUT
800
–800
70
–80
80
V
IN
(m
V)
VS = ±5V
05
57
5-
0
73
Figure 73. Pulse Response for Two Values of Output Capacitance
with ±5 V Supplies and a 20 Ω Snubbing Resistor
The effects of stray output capacitance are mitigated with a
small value snubbing resistor, RSNUB, placed in series with, and
as near as possible to, the VOUT pin. Figure 69, Figure 71, and
Figure 73 show the improvement in dynamic performance with
a 20 Ω snubbing resistor. RSNUB reduces the gain slightly by the
ratio of RL/(RSNUB + RL), a very small loss when used with high
impedance loads, such as ADCs. For other loads, alternate values
of RSNUB can be determined empirically. The data for the curves in
the Typical Performance Characteristics section are derived using
a 20 Ω snubbing resistor.
The best way to avoid the effects of stray capacitance is to
exercise care in the PCB layout. Locate the passive components
or devices connected to the AD8337 output pins as close as
possible to the package.
Although a nonissue, the preamplifier output is also sensitive to
load capacitance. However, the series connection of RFB1 and
RFB2 is typically the only load connected to the preamplifier. If
overshoot appears, it can be mitigated by inserting a snubbing
resistor, the same way as the VGA output.
GAIN CONTROL CONSIDERATIONS
In typical applications, voltages applied to the GAIN input are dc
or relatively low frequency signals. The high input impedance of
the AD8337 enables several devices to be connected in parallel.
This is useful for arrays of VGAs, such as those used for calibra-
tion adjustments.
Under dc or slowly changing ramp conditions, the gain tracks
the gain control voltage, as shown in Figure 3. However, it is often
necessary to consider other effects influenced by the VGAIN input.
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