參數(shù)資料
型號(hào): ADA4897-1ARJZ-R7
廠商: Analog Devices Inc
文件頁數(shù): 13/29頁
文件大?。?/td> 0K
描述: IC OPAMP GP RR 230MHZ LN SOT23-6
標(biāo)準(zhǔn)包裝: 3,000
放大器類型: 電壓反饋
電路數(shù): 1
輸出類型: 滿擺幅
轉(zhuǎn)換速率: 120 V/µs
-3db帶寬: 230MHz
電流 - 輸入偏壓: 11µA
電壓 - 輸入偏移: 28µV
電流 - 電源: 3mA
電流 - 輸出 / 通道: 80mA
電壓 - 電源,單路/雙路(±): 3 V ~ 10 V,±1.5 V ~ 5 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: SOT-23-6
供應(yīng)商設(shè)備封裝: SOT-23-6
包裝: 帶卷 (TR)
Data Sheet
ADA4896-2/ADA4897-1/ADA4897-2
Rev.
| Page 19 of 28
NOISE CONSIDERATIONS
Figure 48 illustrates the primary noise contributors for the
typical gain configurations. The total rms output noise is
the root-mean-square of all the contributions.
RG
RS
iep
ien
+ vout_en –
RF
ven
4kT × RS
vn _ RS =
4kT × RG
vn _ RG =
4kT × RF
vn _ RF =
09447-
034
Figure 48. Noise Sources in Typical Connection
The output noise spectral density can be calculated by
[]
2
4
1
4
_
F
G
F
S
G
F
R
ien
kTR
R
ven
R
iep
kTRs
R
kTR
en
vout
+
+
+
=
(6)
where:
k is Boltzmann’s constant.
T is the absolute temperature (degrees Kelvin).
iep and ien represent the amplifier input current noise spectral
density (pA/√Hz).
ven is the amplifier input voltage noise spectral density (nV/√Hz).
RS is the source resistance, as shown in Figure 48.
RF and RG are the feedback network resistances, as shown in
Source resistance noise, amplifier voltage noise (ven), and the
voltage noise from the amplifier current noise (iep × RS) are all
subject to the noise gain term (1 + RF/RG). Note that with a
1 nV/√Hz input voltage noise and 2.8 pA/√Hz input current
noise, the noise contributions of the amplifier are relatively
small for source resistances from approximately 50 Ω to 700 Ω.
Figure 49 shows the total RTI noise due to the amplifier vs. the
source resistance. In addition, the value of the feedback resistors
used affects the noise. It is recommended that the value of the
feedback resistors be maintained between 250 Ω and 1 kΩ to
keep the total noise low.
50
500
NO
IS
E
(
n
V
/√
Hz
)
SOURCE RESISTANCE ()
5
0.5
50
500
5k
50k
TOTAL
AMPLIFIER NOISE
AMPLIFIER AND
RESISTOR NOISE
SOURCE
RESISTANCE NOISE
0
944
7-
0
57
Figure 49. RTI Noise vs. Source Resistance
CAPACITANCE DRIVE
Capacitance at the output of an amplifier creates a delay within the
feedback path that, if within the bandwidth of the loop, can create
excessive ringing and oscillation. The ADA4896-2/ADA4897-1/
ADA4897-2 show the most peaking at a gain of +2 (see Figure 9).
Placing a small snub resistor (RSNUB) in series with the amplifier
output and the capacitive load mitigates the problem. Figure 50
shows the effect of using a snub resistor (RSNUB) on reducing the
peaking for the worst-case frequency response (gain of +2).
Using RSNUB = 100 Ω eliminates the peaking entirely, with the
trade-off that the closed-loop gain is reduced by 0.8 dB due to
attenuation at the output. RSNUB can be adjusted from 0 Ω to
100 Ω to maintain an acceptable level of peaking and closed-
loop gain (see Figure 50).
–5
–4
–3
–2
–1
0
1
2
3
NO
RM
AL
IZ
E
D
CL
O
S
E
D
-L
O
P
G
AI
N
(
d
B)
FREQUENCY (MHz)
0.1
1
10
100
RSNUB = 50
RSNUB = 0
RSNUB = 100
ADA4896-2
RL
1k
R1
249
R2
249
CL
39pF
RSNUB
VIN
VOUT
VS = +5V
VOUT = 200mV p-p
G = +2
09
447
-05
8
Figure 50. Using a Snub Resistor to Reduce Peaking
Due to Output Capacitive Load
B
相關(guān)PDF資料
PDF描述
PPTC391LGBN-RC CONN FEMALE 39POS .100" R/A TIN
LTC6247CMS8#TRPBF IC OPAMP RRIO 180MHZ DL 8MSOP
AD8065WARTZ-R7 IC OPAMP VF R-R LN LP SOT23-5
PPTC391LGBN CONN FEMALE 39POS .100" R/A TIN
AD8226BRZ-R7 IC INSTR AMP RRO +/-18 8SOIC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADA4897-1ARJZ-RL 功能描述:IC OPAMP GP RR 230MHZ LN SOT23-6 RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉(zhuǎn)換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源,單路/雙路(±):1.8 V ~ 5.25 V,±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP,10-MSOP(0.118",3.00mm 寬) 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件
ADA4897-1ARZ 功能描述:IC OP AMP LOW NOISE 8-SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源,單路/雙路(±):3 V ~ 32 V,±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP(0.173",4.40mm 寬) 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR
ADA4897-1ARZ_PROMO 制造商:Analog Devices 功能描述:IC OP AMP R/R LOW POWER SO
ADA4897-1ARZ-R7 功能描述:IC OPAMP GP RR 230MHZ LN 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源,單路/雙路(±):3 V ~ 16 V,±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC(0.154",3.90mm 寬) 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5
ADA4897-1ARZ-RL 功能描述:IC OPAMP GP RR 230MHZ LN 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源,單路/雙路(±):3 V ~ 16 V,±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC(0.154",3.90mm 寬) 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5