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| 型号： | AD8337-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD8337 |
| 标准包装： | 1 |
| 系列： | X-AMP® |
| 每 IC 通道数： | 1 - 单 |
| 放大器类型： | 电压反馈 |
| 输出类型： | 单端 |
| 转换速率： | 625 V/µs |
| -3db带宽： | 280MHz |
| 工作温度： | -40°C ~ 85°C |
| 电流供应（主 IC）： | 18.5mA |
| 电压 - 电源，单路/双路(±)： | ±2.5 V ~ 5 V |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | AD8337 |
| 产品目录页面： | 775 (CN2011-ZH PDF) |
| 相关产品： | AD8337BCPZ-REEL7-ND - IC AMP VGA LOW NOISE 8-LFCSP AD8337BCPZ-REEL-ND - IC AMP VGA LOW NOISE 8-LFCSP AD8337BCPZ-WP-ND - IC AMP VGA DC-COUPLED GP 8-LFCSP AD8337BCPZ-R2DKR-ND - IC AMP VGA LOW NOISE 8-LFCSP AD8337BCPZ-R2CT-ND - IC AMP VGA LOW NOISE 8-LFCSP AD8337BCPZ-R2TR-ND - IC AMP VGA LOW NOISE 8-LFCSP |
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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
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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| AD8337-EVALZ-INV | 功能描述:BOARD EVALUATION FOR AD8337 INS RoHS:是 类别:编程器，开发系统 >> 评估板 - 运算放大器 系列:X-AMP® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
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| AD8338ACPZ-R7 | 功能描述:特殊用途放大器 Ultra Low Pwr 18MHz SGL CH VGA RoHS:否 制造商:Analog Devices 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:5 V 电源电流:133 mA 最大功率耗散:900 mW 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-28 封装:Reel |
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