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參數(shù)資料
| 型號(hào)： | AD8337-EVALZ-INV |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/32頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD8337 INS |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | X-AMP® |
| 每 IC 通道數(shù)： | 1 - 單 |
| 放大器類型： | 電壓反饋 |
| 輸出類型： | 單端 |
| 轉(zhuǎn)換速率： | 625 V/µs |
| -3db帶寬： | 280MHz |
| 工作溫度： | -40°C ~ 85°C |
| 電流供應(yīng)（主 IC）： | 18.5mA |
| 電壓 - 電源，單路/雙路(±)： | ±2.5 V ~ 5 V |
| 板類型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | AD8337 |
| 相關(guān)產(chǎn)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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8337-EVALZ-SS | 功能描述:BOARD EVALUATION FOR AD8337 SS RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - 運(yùn)算放大器 系列:X-AMP® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- |
| AD8338 | 制造商:AD 制造商全稱: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 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:5 V 電源電流:133 mA 最大功率耗散:900 mW 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-28 封裝: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:- 零件狀態(tài):有效 每 IC 通道數(shù):1 - 單 放大器類型:可變?cè)鲆?輸出類型:差分 壓擺率:50 V/μs -3db 帶寬:18MHz 電流 - 輸出/通道:- 工作溫度:-40°C ~ 85°C 電流 - 電源（主 IC）:- 電壓 - 電源，單/雙（±）:3.5 V ~ 5 V 板類型:完全填充 所含物品:板 使用的 IC/零件:AD8338 標(biāo)準(zhǔn)包裝:1 |
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