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| 型号： | AD8337-EVALZ-SS |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD8337 SS |
| 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(±)： | 5 V ~ 10 V |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | AD8337 |
| 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 20 of
32
APPLICATIONS INFORMATION
PREAMPLIFIER CONNECTIONS
Noninverting Gain Configuration
The AD8337 preamplifier is an uncommitted current-feedback
for the noninverting feedback connections.
RG
PRAO
PREAMPLIFIER
+
–
INPP
INPN
5
3
4
0
557
5-
0
66
RFB2
RFB1
Figure 66. AD8337 Preamplifier Configured for Noninverting Gain
Two surface-mount resistors establish the preamplifier gain.
Equal values of 100 Ω configure the preamplifier for a 6 dB gain
and the device for a default gain range of 0 dB to 24 dB.
For preamplifier gains ≥2, select a value of RFB2 ≥ 100 Ω and
RFB1 ≤ 100 Ω. Higher values of RFB2 reduce the bandwidth and
increase the offset voltage, but smaller values compromise
stability. If RFB1 ≤ 100 Ω, the gain increases and the input-
referred noise decreases.
Inverting Gain Configuration
For applications requiring polarity inversion of negative pulses, or
for waveforms that require current sinking, the preamplifier can
be configured as an inverting gain amplifier. When configured
with bipolar supplies, the preamplifier amplifies positive or
negative input voltages with no level shifting of the common-
mode input voltage required. Figure 67 shows the AD8337
configured for inverting gain operation.
Because the AD8337 is a very high frequency device, stability
issues can occur unless the circuit board on which it is used is
carefully laid out. The stability of the preamp is affected by
parasitic capacitance around the INPN pin. To minimize stray
capacitance position the preamp gain resistors, RFB1 and RFB2, as
close as possible to the INPN pin.
PRAO
PREAMPLIFIER
+
–
INPP
INPN
5
3
4
05
57
5-
06
7
RFB2
RFB1
Figure 67. The AD8337 Preamplifier Configured for Inverting Gain
DRIVING CAPACITIVE LOADS
Because of the large bandwidth of the AD8337, stray capacitance at
the output pin can induce peaking in the frequency response as the
gain of the amplifier begins to roll off. Figure 68 shows peaking
with two values of load capacitance using ±2.5 V supplies and
VGAIN = 0 V.
GA
IN
(
d
B
)
–5
0
10
20
15
25
100k
5
FREQUENCY (Hz)
1M
500M
100M
10M
055
75-
0
68
CL = 0pF
CL = 10pF
CL = 22pF
VGAIN = 0V
NO SNUBBING RESISTOR
Figure 68. Peaking in the Frequency Response for Two Values of Output
Capacitance with ±2.5 V Supplies and No Snubbing Resistor
GA
IN
(
d
B
)
–5
0
10
20
15
25
100k
5
FREQUENCY (Hz)
1M
500M
100M
10M
05
575-
069
CL = 0pF
CL = 10pF
CL = 22pF
VGAIN = 0V
WITH 20 SNUBBING RESISTOR
Figure 69. Frequency Response for Two Values of Output Capacitance
with a 20 Ω Snubbing Resistor
In the time domain, stray capacitance at the output pin can
induce overshoot on the edges of transient signals, as shown in
function of the slewing of the transient (not shown in Figure 70
and Figure 72). The transition time of the input pulses used for
strate the fast response time of the amplifier. Signals with longer
transition times generate less overshoot.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8338 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Power, 18 MHz Variable Gain Amplifier |
| 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 |
| AD8338ACPZ-RL | 制造商:Analog Devices 功能描述:AMPLIFIER - SPECIAL PURPOSE |
| AD8338-EVALZ | 功能描述:AD8338 1 - Single Channels per IC Variable Gain Amplifier Evaluation Board 制造商:analog devices inc. 系列:- 零件状态:有效 每 IC 通道数:1 - 单 放大器类型:可变增益 输出类型:差分 压摆率:50 V/μs -3db 带宽:18MHz 电流 - 输出/通道:- 工作温度:-40°C ~ 85°C 电流 - 电源（主 IC）:- 电压 - 电源，单/双（±）:3.5 V ~ 5 V 板类型:完全填充 所含物品:板 使用的 IC/零件:AD8338 标准包装:1 |
| AD8339 | 制造商:AD 制造商全称:Analog Devices 功能描述:Quad I/Q Demodulator And Phase Shifter |
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