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参数资料
| 型号： | ADA4899-1YRDZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/21页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP VF ULN ULDIST 8SOIC |
| 产品培训模块： | Practical Guide High Speed PCB Layout |
| 设计资源： | High Speed, Precision, Differential AC-Coupled Drive Circuit for AD7625 (CN0080) |
| 标准包装： | 2,500 |
| 放大器类型： | 电压反馈 |
| 电路数： | 1 |
| 转换速率： | 310 V/µs |
| -3db带宽： | 600MHz |
| 电流 - 输入偏压： | 6µA |
| 电压 - 输入偏移： | 35µV |
| 电流 - 电源： | 14.7mA |
| 电流 - 输出 / 通道： | 200mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 12 V，±2.25 V ~ 6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 供应商设备封装： | 8-SOIC-EP |
| 包装： | 带卷 (TR) |
ADA4899-1
Rev. B | Page 15 of 20
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).
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
B TO OUTPUT
= – R2
R1
GAIN FROM
A TO OUTPUT
=
NOISE GAIN =
NG = 1 + R2
R1
IN–
VN
VN, R1
VN, R3
R1
R2
IN+
R3
4kTR2
4kTR1
4kTR3
VN, R2
B
A
VN2 + 4kTR3 + 4kTR1
R2
2
R1 + R2
IN+2R32 + IN–2
R1 × R2
2
+ 4kTR2
R1
2
R1 + R2
RTI NOISE =
RTO NOISE = NG × RTI NOISE
VOUT
+
0
57
20
-07
0
Figure 48. Op Amp Noise Analysis Model
All resistors have a Johnson noise that is calculated by
)
(4kBTR
where:
k is Boltzmann’s Constant (1.38 × 10–23 J/K).
B is the bandwidth in Hz.
T is the absolute temperature in Kelvin.
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.
05
72
0-
0
62
+5V
ANALOG
INPUT
ADA4899-1
–5V
2.7nF
25
15
+5V
ANALOG
INPUT
+
–
ADA4899-1
–5V
2.7nF
25
15
AD7677
IN+
IN–
Figure 49. Single-Ended Input ADC Driver
Table 5. ADA4899-1, Single-Ended Driver for AD7677
16-Bit, 1 MSPS, fC = 50 kHz
Parameter
Measurement (dB)
Second Harmonic Distortion
116.5
Third Harmonic Distortion
111.9
THD
108.6
SFDR
+101.4
SNR
+92.6
The ADA4899-1 configured as a single-ended-to-differential
associated performance.
05720-
061
+5V
+2.5V REF
ANALOG
INPUT
ADA4899-1
–5V
590
+5V
+2.5V
REF
ADA4899-1
–5V
2.7nF
590
15
590
AD7677
IN+
IN–
Figure 50. Single-Ended-to-Differential ADC Driver
Table 6. ADA4899-1, Single Ended-to-Differential Driver for
AD7677 16-Bit, 1 MSPS, fC = 500 kHz
Parameter
Measurement (dB)
THD
92.7
SFDR
+91.8
SNR
+90.6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADA4922-1 | 制造商:AD 制造商全称:Analog Devices 功能描述:14-Bit, 1 MSPS, Differential, Programmable Input PulSAR ADC |
| ADA4922-1ACP-EBZ | 功能描述:BOARD EVAL FOR ADA4922-1ACP RoHS:是 类别:编程器，开发系统 >> 评估板 - 运算放大器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
| ADA4922-1ACPZ-R2 | 功能描述:IC ADC DRIVER 18BIT DIFF 8-LFCSP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
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| ADA4922-1ACPZ-RL | 功能描述:IC ADC DRIVER 18BIT DIFF 8-LFCSP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
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