参数资料
型号: ADA4897-1ARZ-R7
厂商: Analog Devices Inc
文件页数: 17/29页
文件大小: 0K
描述: IC OPAMP GP RR 230MHZ LN 8SOIC
特色产品: Rail-to-Rail Input/Output Amplifiers
标准包装: 1,000
放大器类型: 电压反馈
电路数: 1
输出类型: 满摆幅
转换速率: 120 V/µs
-3db带宽: 230MHz
电流 - 输入偏压: 11µA
电压 - 输入偏移: 28µV
电流 - 电源: 3mA
电流 - 输出 / 通道: 80mA
电压 - 电源,单路/双路(±): 3 V ~ 10 V,±1.5 V ~ 5 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 宽)
供应商设备封装: 8-SO
包装: 带卷 (TR)
Data Sheet
ADA4896-2/ADA4897-1/ADA4897-2
Rev.
| Page 23 of 28
ADA4896-2/ADA4897-1/ADA4897-2 in the Ultrasound System
LNA
AD7982
18-BIT ADC
2.5V
4nF
50
I
CHANNEL H
CHANNEL A
LO
GENERATION
4
R
E
SET
4L
O
+
4L
O
CWI+
CWI–
AD9279
CFILT
RFILT
1.5V
RFILT
RA
AD7982
18-BIT ADC
2.5V
4nF
50
Q
CWQ+
CWQ–
CFILT
RFILT
1.5V
RFILT
Φ
09
44
7-
0
32
ADA4896-2/
ADA4897-1/
ADA4897-2
ADA4896-2/
ADA4897-1/
ADA4897-2
ADA4896-2/
ADA4897-1/
ADA4897-2
ADA4896-2/
ADA4897-1/
ADA4897-2
Figure 55. Using the ADA4896-2/ADA4897-1/ADA4897-2 as Filters, I-to-V Converters, Current Summers, and ADC Drivers After the I/Q Outputs of the AD9279
The ADA4896-2/ADA4897-1/ADA4897-2 are used in the CW
Doppler path in the ultrasound application after the I/Q demod-
ulators of the AD9279. Doppler signals can be typically between
100 Hz to 100 kHz. The low noise floor and high dynamic range
of the ADA4896-2/ADA4897-1/ADA4897-2 make them excellent
choices for processing weak Doppler signals.
The rail-to-rail output and the high output current drive of
the ADA4896-2/ADA4897-1/ADA4897-2 make them suitable
candidates for the I-to-V converter, current summer, and ADC
driver.
Figure 55 shows an interconnection block diagram of all
eight channels of the AD9279. Two stages of the ADA4896-2
amplifiers are used. The first stage performs an I-to-V conver-
sion and filters the high frequency content that results from
the demodulation process. The second stage of the ADA4896-2
amplifiers is used to sum the output currents of multiple AD9279
devices, to provide gain, and to drive the AD7982 device, an
18-bit SAR ADC.
The output-referred noise of the CW signal path depends on
the LNA gain, the selection of the first stage summing amplifier,
and the value of RFILT. To determine the output-referred noise, it
is important to know the active low-pass filter (LPF) values RA,
RFILT, and CFILT, as shown as Figure 55. Typical filter values for
all eight channels of a single AD9279 are 100 Ω for RA, 500 Ω
for RFILT, and 2.0 nF for CFILT; these values implement a 100 kHz,
single-pole LPF.
The gain of the I-to-V converter can be increased by increasing
the filter resistor, RFILT. To keep the corner frequency unchanged,
decrease the filter capacitor, CFILT, by the same factor. The factor
limiting the magnitude of the gain is the output swing and drive
capability of the op amp selected for the I-to-V converter, in this
any amplifier has limited drive capability, a finite number of
channels can be summed.
B
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