參數(shù)資料
型號(hào): ADA4075-2ACPZ-RL
廠商: Analog Devices Inc
文件頁數(shù): 11/24頁
文件大?。?/td> 0K
描述: IC OPAMP GP 6.5MHZ DL LN 8LFCSP
標(biāo)準(zhǔn)包裝: 10,000
系列: iPolar®
放大器類型: 通用
電路數(shù): 2
轉(zhuǎn)換速率: 12 V/µs
增益帶寬積: 6.5MHz
電流 - 輸入偏壓: 30nA
電壓 - 輸入偏移: 300µV
電流 - 電源: 1.8mA
電流 - 輸出 / 通道: 40mA
電壓 - 電源,單路/雙路(±): ±4.5 V ~ 18 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 8-UFDFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 8-LFCSP-WD
包裝: 帶卷 (TR)
Data Sheet
ADA4075-2
Rev. C | Page 19 of 24
BALANCED LINE RECEIVER
Figure 68 depicts a unity-gain balanced line receiver capable of
a high degree of hum rejection. The CMRR is approximately
given by
)
(
2
log
20
3
2
4
1
3
2
4
3
4
1
10
R
+
Therefore, R1 to R4 should be close tolerance components to
obtain the best possible CMRR without adjustment. The presence
of A2 ensures that the impedances are symmetric at the two inputs
(unlike many other designs), and, as a bonus, A2 also provides
a complementary output. A3 raises the common-mode input
impedance from approximately 7.5 kΩ to approximately 70 kΩ,
reducing the degradation of CMRR due to mismatches in source
impedance.
Note that A3 is not in the signal path, and almost any op amp
works well here. Although it may seem as though the inverting
output should be noisier than the noninverting one, they are in
fact symmetric at about 111 dBV (20 kHz bandwidth).
Sometimes an overall gain of is desired to provide an extra
6 dB of differential input headroom. This can be attained by
reducing R3 and R4 to 5 kΩ and increasing R9 to 22 kΩ.
R5
5k
OUT–
OUT+
IN–
*A3 REDUCES THE DEGRADATION OF CMRR
(SEE THE BALANCED LINE RECEIVER SECTION FOR MORE DETAILS).
C1
22F
(NON-POLAR)
IN+
07642-
071
R4
10k
1/2
ADA4075-2
R3
10k
R6
5k
R1
5k
R2
5k
C2
50pF
R9
11k
A3*
R8
5.6k
R7
5.6k
1/2
A1
A2
ADA4075-2
C3
50pF
R10
11k
Figure 68. Balanced Line Receiver
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