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參數(shù)資料
| 型號： | AD8644AR2 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Single and Quad +18 V Operational Amplifiers |
| 中文描述： | 單路和四路運算放大器18 V |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 303K |
| 代理商： | AD8644AR2 |
AD8614/AD8644
–7–
REV. 0
The optimum values for the snubber network should be determined
empirically based on the size of the capacitive load. Table I shows a
few sample snubber network values for a given load capacitance.
Table I. Snubber Networks for Large Capacitive Loads
Load Capacitance
(C
L
)
0.47 nF
4.7 nF
47 nF
Snubber Network
(R
S
, C
S
)
300
, 0.1
μ
F
30
, 1
μ
F
5
, 1
μ
F
Direct Access Arrangement
Figure 26 shows a schematic for a 5V single supply transmit/receive
telephone line interface for 600
transmission systems. It allows
full duplex transmission of signals on a transformer-coupled 600
line. Amplifier A1 provides gain that can be adjusted to meet the
modem output drive requirements. Both A1 and A2 are configured
to apply the largest possible differential signal to the transformer.
The largest signal available on a single 5V supply is approximately
4.0 V p-p into a 600
transmission system. Amplifier A3 is config-
ured as a difference amplifier to extract the receive information from
the transmission line for amplification by A4. A3 also prevents the
transmit signal from interfering with the receive signal. The gain of
A4 can be adjusted in the same manner as A1’s to meet the modem’s
input signal requirements. Standard resistor values permit the use of
SIP (Single In-Line Package) format resistor arrays. Couple this with
the AD8644 14-lead SOIC or TSSOP package and this circuit can
offer a compact solution.
6.2V
6.2V
TRANSMIT
TxA
RECEIVE
RxA
C1
0.1
m
F
R1
10k
V
R2
9.09k
V
2k
V
P1
Tx GAIN
ADJUST
A1
A2
A3
A4
A1, A2 = 1/2 AD8644
A3, A4 = 1/2 AD8644
R3
360
V
1:1
T1
TO TELEPHONE
LINE
1
2
3
7
6
5
2
3
1
6
5
7
10
m
F
R7
10k
V
R8
10k
V
R5
10k
V
R6
10k
V
R9
10k
V
R14
14.3k
V
R10
10k
V
R11
10k
V
R12
10k
V
R13
10k
V
C2
0.1
m
F
P2
Rx GAIN
ADJUST
2k
V
Z
O
600
V
5V DC
MIDCOM
671-8005
Figure 26. A Single-Supply Direct Access Arrangement for
Modems
A One-Chip Headphone/Microphone Preamplifier Solution
Because of its high output current performance, the AD8644
makes an excellent amplifier for driving an audio output jack in
a computer application. Figure 27 shows how the AD8644 can
be interfaced with an ac codec to drive headphones or speakers
U1-A
R1
2k
V
4
C1
100
m
F
5V
1
10
2
3
5
5V
V
DD
V
DD
LEFT
OUT
AD1881
(AC'97)
RIGHT
OUT
V
SS
R3
20
V
7
8
6
9
R4
20
V
C2
100
m
F
NOTE: ADDITIONAL PINS
OMITTED FOR CLARITY
U1-B
U1 = AD8644
R2
2k
V
28
35
36
Figure 27. A PC-99 Compliant Headphone/Line Out Amplifier
If gain is required from the output amplifier, four additional
resistors should be added as shown in Figure 28. The gain of
the AD8644 can be set as:
A
R
R
V
=
6
5
U1-A
R1
2k
V
4
C1
100
m
F
5V
1
10
2
3
5
5V
V
DD
V
DD
LEFT
OUT
AD1881
(AC97)
RIGHT
OUT
V
SS
R3
20
V
7
8
6
9
R4
20
V
C2
100
m
F
NOTE: ADDITIONAL PINS
OMITTED FOR CLARITY
U1-B
U1 = AD8644
R2
2k
V
R6
20k
V
R6
20k
V
V
REF
R5
10k
V
R5
10k
V
A
V
=
= +6dB WITH VALUES SHOWN
R6
R5
38
35
27
36
Figure 28. A PC-99-Compliant Headphone/Speaker
Amplifier with Gain
Input coupling capacitors are not required for either circuit as
the reference voltage is supplied from the AD1881.
R4 and R5 help protect the AD8644 output in case the output
jack or headphone wires are accidentally shorted to ground.
The output coupling capacitors C1 and C2 block dc current
from the headphones and create a high-pass filter with a corner
frequency of:
f
C R
1
π
R
dB
L
=
+
)
3
1
2
4
Where
R
L
is the resistance of the headphones.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8644AR-REEL | 制造商:Analog Devices 功能描述:OP Amp Quad GP R-R I/O 18V 14-Pin SOIC N T/R |
| AD8644AR-REEL7 | 制造商:Analog Devices 功能描述:OP Amp Quad GP R-R I/O 18V 14-Pin SOIC N T/R |
| AD8644ARU | 制造商:Analog Devices 功能描述:OP Amp Quad GP R-R I/O 18V 14-Pin TSSOP 制造商:Rochester Electronics LLC 功能描述:QUAD 18V LCD DRIVER - Bulk |
| AD8644ARU-REEL | 制造商:Analog Devices 功能描述:OP Amp Quad GP R-R I/O 18V 14-Pin TSSOP T/R 制造商:Rochester Electronics LLC 功能描述:QUAD 18V LCD DRIVER - Tape and Reel |
| AD8644ARUZ | 功能描述:IC OPAMP GP R-R 5.5MHZ 14TSSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
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