- 您現(xiàn)在的位置：買(mǎi)賣IC網(wǎng) > PDF目錄373974 > ADA4899-1 (Analog Devices, Inc.) Unity Gain Stable, Ultralow Distortion, 1 nV/ Hz Voltage Noise, High Speed Op Amp PDF資料下載
參數(shù)資料
| 型號(hào)： | ADA4899-1 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Unity Gain Stable, Ultralow Distortion, 1 nV/ Hz Voltage Noise, High Speed Op Amp |
| 中文描述： | 單位增益穩(wěn)定，內(nèi)華達(dá)州超低失真1 / Hz的電壓噪聲，高速運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 15/20頁(yè) |
| 文件大小： | 496K |
| 代理商： | ADA4899-1 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)當(dāng)前第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)
ADA4899-1
NOISE
To analyze the noise performance of an amplifier circuit, first
identify the noise sources, then determine if the source has a
significant contribution to the overall noise performance of the
amplifier. To simplify the noise calculations, noise spectral
densities were used, rather than actual voltages to leave
bandwidth out of the expressions (noise spectral density, which
is generally expressed in nV/
√
Hz, is equivalent to the noise in a
1 Hz bandwidth).
Rev. A | Page 15 of 20
The noise model shown in Figure 48 has six individual noise
sources: the Johnson noise of the three resistors, the op amp
voltage noise, and the current noise in each input of the
amplifier. Each noise source has its own contribution to the
noise at the output. Noise is generally specified referred to input
(RTI), but it is often simpler to calculate the noise referred to
the output (RTO) and then divide by the noise gain to obtain
the RTI noise.
"GAIN FROM
R1
"GAIN FROM
NOISE GAIN =
NG = 1 +R2
I
N–
V
N
V
N, R1
V
N, R3
R1
R2
I
N+
R3
4kTR2
4kTR1
4kTR3
V
N, R2
B
A
V
N2
+ 4kTR3 + 4kTR1 R1 + R2
2
I
N+2
R3
2
+ I
N–2
R1 × R2
2
+ 4kTR2
R1
2
R1 + R2
R1 + R2
RTI NOISE =
RTO NOISE = NG × RTI NOISE
Figure 48. Op Amp Noise Analysis Model
V
OUT
+
0
All resistors have a Johnson noise that is calculated by
)
(4
kBTR
where:
k
is Boltzmann’s Constant (1.38 × 10
–23
J/K).
T
is the absolute temperature in Kelvin.
B
is the bandwidth in Hz.
R
is the resistance in ohms.
A simple relationship that is easy to remember is that a 50 Ω
resistor generates a Johnson noise of 1 nV
√
Hz at 25°C.
In applications where noise sensitivity is critical, care must be
taken not to introduce other significant noise sources to the
amplifier. Each resistor is a noise source. Attention to the
following areas is critical to maintain low noise performance:
design, layout, and component selection. A summary of noise
performance for the amplifier and associated resistors can be
seen in Table 4.
ADC DRIVER
The ultralow noise and distortion performance of the
ADA4899-1 makes it an excellent candidate for driving 16-bit
ADCs. The schematic for a single-ended input buffer using the
ADA4899-1 and the
AD7677
, a 1 MSPS, 16-bit ADC, is shown
in Figure 49. Table 5 shows the performance data of the
ADA4899-1 and the
AD7677
.
0
+5V
ANALOG
INPUT
ADA4899-1
–5V
2.7nF
25
15
+5V
+5V
ANALOG
INPUT
+
–
ADA4899-1
–5V
2.7nF
25
15
AD7677
IN–
IN+
+2.5V
REF
–5V
REF
Figure 49. Single-Ended Input ADC Driver
Table 5. ADA4899-1, Single-Ended Driver for AD7677
16-Bit, 1 MSPS, f
c
= 50 kHz
Parameter
Second Harmonic Distortion
Third Harmonic Distortion
THD
SFDR
SNR
Measurement (dB)
116.5
111.9
108.6
+101.4
+92.6
The ADA4899-1 configured as a single-ended-to-differential
driver for the
AD7677
is shown in Figure 50. Table 6 shows the
associated performance.
0
+5V
+2.5V REF
AINPUT
ADA4899-1
–5V
590
590
+5V
+REF
+2.5V
ADA4899-1
–5V
2.7nF
2.7nF
590
590
590
15
15
590
AD7677
IN–
IN+
REF
+5V
–5V
Figure 50. Single-Ended-to-Differential ADC Driver
Table 6. ADA4899-1, Single Ended-to-Differential Driver for
AD7677 16-Bit, 1 MSPS, f
c
= 500 kHz
Parameter
THD
SFDR
SNR
Measurement (dB)
92.7
+91.8
+90.6
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADA4899-1YCPZ-R2 | Unity Gain Stable, Ultralow Distortion, 1 nV/ Hz Voltage Noise, High Speed Op Amp |
| ADA4899-1YCPZ-R7 | Unity Gain Stable, Ultralow Distortion, 1 nV/ Hz Voltage Noise, High Speed Op Amp |
| ADA4899-1YCPZ-RL | Unity Gain Stable, Ultralow Distortion, 1 nV/ Hz Voltage Noise, High Speed Op Amp |
| ADA4899-1YRDZ | Unity Gain Stable, Ultralow Distortion, 1 nV/ Hz Voltage Noise, High Speed Op Amp |
| ADA4899-1YRDZ-R7 | Unity Gain Stable, Ultralow Distortion, 1 nV/ Hz Voltage Noise, High Speed Op Amp |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADA4899-1_07 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Unity-Gain Stable, Ultralow Distortion, 1 nV/☆Hz Voltage Noise, High Speed Op Amp |
| ADA4899-1YCP-EBZ | 功能描述:BOARD EVAL FOR ADA4899-1YCP RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 運(yùn)算放大器 系列:- 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:- |
| ADA4899-1YCPZ-R2 | 制造商:Analog Devices 功能描述:OP Amp Single Volt Fdbk ±6V/12V 8-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:OP AMP SGL VOLT FDBK 6V/12V 8LFCSP - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:ULTRA LOW NOISE AND DISTORTION HI SPEED - Bulk 制造商:Analog Devices 功能描述:IC OP-AMP 600MHZ 310V/ LFCSP-8 制造商:Analog Devices 功能描述:IC, OP-AMP, 600MHZ, 310V/s, LFCSP-8, Op Amp Type:Voltage Feedback, No. of Ampli |
| ADA4899-1YCPZ-R7 | 功能描述:IC OPAMP VF ULN ULDIST 8LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 產(chǎn)品培訓(xùn)模塊:Differential Circuit Design Techniques for Communication Applications 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:RF/IF 差分 電路數(shù):1 輸出類型:差分 轉(zhuǎn)換速率:9800 V/µs 增益帶寬積:- -3db帶寬:2.9GHz 電流 - 輸入偏壓:3µA 電壓 - 輸入偏移:- 電流 - 電源:40mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):3 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-VQFN 裸露焊盤(pán)，CSP 供應(yīng)商設(shè)備封裝:16-LFCSP-VQ 包裝:剪切帶 (CT) 產(chǎn)品目錄頁(yè)面:551 (CN2011-ZH PDF) 其它名稱:ADL5561ACPZ-R7CT |
| ADA4899-1YCPZ-RL | 功能描述:IC OPAMP VF ULN ULDIST 8LFCSP 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 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。