參數(shù)資料
型號(hào)： ADA4897-2ARMZ-R7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 17/29頁(yè)
文件大?。?/td> 0K
描述： IC OPAMP RR 230MHZ LP 10MSOP
標(biāo)準(zhǔn)包裝： 1,000
放大器類型： 電壓反饋
電路數(shù)： 2
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： 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝： 10-MSOP
包裝： 帶卷 (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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