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參數資料
| 型號： | AD8644ARU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Single and Quad +18 V Operational Amplifiers |
| 中文描述： | QUAD OP-AMP, 3000 uV OFFSET-MAX, 5.5 MHz BAND WIDTH, PDSO14 |
| 封裝： | MO-153AB1, TSSOP-14 |
| 文件頁數： | 7/8頁 |
| 文件大小： | 303K |
| 代理商： | AD8644ARU |
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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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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:- 標準包裝:1 系列:- 放大器類型:通用 電路數:4 輸出類型:滿擺幅 轉換速率: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） 供應商設備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
| AD8644ARUZ-REEL | 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:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 放大器類型:電流檢測 電路數:1 輸出類型:- 轉換速率:- 增益帶寬積:125kHz -3db帶寬:- 電流 - 輸入偏壓:- 電壓 - 輸入偏移:100µV 電流 - 電源:1.1µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:4-WFBGA，CSPBGA 供應商設備封裝:4-UCSP（2x2） 包裝:剪切帶 (CT) 其它名稱:MAX9634WERS+TCT |
| AD8644ARZ | 功能描述:IC OPAMP GP R-R 5.5MHZ 14SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數:4 輸出類型:- 轉換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD8644ARZ-REEL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Single and Quad 18 V Operational Amplifiers |
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