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參數(shù)資料
| 型號(hào)： | AD8337BCPZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/32頁 |
| 文件大小： | 0K |
| 描述： | IC AMP VGA LOW NOISE 8-LFCSP |
| 標(biāo)準(zhǔn)包裝： | 1,500 |
| 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 |
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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 |
|---|---|
| AD8337BCPZWP | 制造商:Analog Devices 功能描述:IC,Voltage Controlled Gain Amplifier,SINGLE,LLCC,8PIN |
| AD8337BCPZ-WP | 功能描述:IC AMP VGA DC-COUPLED GP 8-LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 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:60 系列:- 類型:可變?cè)鲆娣糯笃?應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| AD8337-EVAL-INV | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD8337-EVAL-SS | 制造商:Analog Devices 功能描述: |
| AD8337-EVALZ | 功能描述:BOARD EVALUATION FOR AD8337 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:- |
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