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參數資料
| 型號： | AD8527ARMZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 3/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP GP R-R 7MHZ DUAL 8MSOP |
| 標準包裝： | 1 |
| 放大器類型： | 通用 |
| 電路數： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉換速率： | 8 V/µs |
| 增益帶寬積： | 7MHz |
| 電流 - 輸入偏壓： | 450nA |
| 電壓 - 輸入偏移： | 1300µV |
| 電流 - 電源： | 900µA |
| 電流 - 輸出 / 通道： | 10mA |
| 電壓 - 電源，單路/雙路(±)： | 1.8 V ~ 6 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 8-MSOP |
| 包裝： | 標準包裝 |
| 其它名稱： | AD8527ARMZ-REELDKR |
AD8517/AD8527
–11–
REV. B
Table III. Snubber Network Values for Large Capacitive Loads
CLOAD
Rx
Cx
680 pF
300
3 nF
1 nF
100
10 nF
400
30 nF
TOTAL HARMONIC DISTORTION + NOISE
The AD85x7 family offers a low total harmonic distortion, which
makes this amplifier ideal for audio applications. Figure 26 shows a
graph of THD + N, for a VS > 3 V the THD + N is about 0.001%
and 0.03% for VS
≥ 1.8 V in a noninverting configuration with a
gain of 1. In an inverting configuration, the noise is 0.003% for
all VSY.
FREQUENCY – Hz
0.01
0.0001
10
20k
THD
+
N
–
%
0.001
0.1
1
100
1k
10k
VS > 3V TO 5V
VS = 1.8V
AV = +2
Figure 26. THD + N vs. Frequency Graph
A MICROPOWER REFERENCE VOLTAGE GENERATOR
Many single supply circuits are configured with the circuit-biased
to one-half of the supply voltage. In these cases, a false-ground
reference can be created by using a voltage divider buffered by an
amplifier. Figure 27 shows the schematic for such a circuit.
The two 1 M
resistors generate the reference voltages while
drawing only 0.9
A of current from a 1.8 V supply. A capacitor
connected from the inverting terminal to the output of the op
amp provides compensation to allow for a bypass capacitor to be
connected at the reference output. This bypass capacitor helps
establish an ac ground for the reference output.
AD8517
10k
0.022 F
VREF
0.9V TO 2.5V
1 F
1M
1.8V TO 5V
100
1M
Figure 27. A Micropower Reference Voltage Generator
MICROPHONE PREAMPLIFIER
The AD8517 is ideal to use as a microphone preamplifier.
Figure 28 shows this implementation.
R3
220k
VCC
VREF
C1
0.1 F
VCC
R1
2.2k
ELECTRET
MIC
VOUT
AD8517
VIN
R2
22k
|AV| =
R3
R2
Figure 28. A Microphone Preamplifier
R1 is used to bias an electret microphone and C1 blocks dc
voltage from the amplifier. The magnitude of the gain of the
amplifier is approximately R3/R2 when R2
≥ 10 × R1. VREF
should be equal to 1/2 1.8 V for maximum voltage swing.
Direct Access Arrangement for Telephone Line Interface
Figure 28 illustrates a 1.8 V transmit/receive telephone line
interface for 600
transmission systems. It allows full duplex
transmission of signals on a transformer-coupled 600
line in a
differential manner. Amplifier A1 provides gain that can be ad-
justed to meet the modem output drive requirements. Both A1
and A2 are configured to apply the largest possible signal on a
single supply to the transformer. Amplifier A3 is configured as a
difference amplifier for two reasons: (1) It prevents the transmit
signal from interfering with the receive signal and (2) it extracts
the receive signal from the transmission line for amplification by
A4. A4’s gain 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 AD8517/AD8527’s 5-lead
SOT-23, 8-lead MSOP, and 8-lead SOIC footprint and this
circuit offers a compact solution.
6.2V
TRANSMIT
TxA
RECEIVE
RxA
C1
0.1 F
R1
10k
R2
9.09k
2k
P1
Tx GAIN
ADJUST
A1
R3
360
1:1
T1
TO
TELEPHONE
LINE
1
2
3
7
6
5
2
3
1
6
5
7
10 F
R7
10k
R8
10k
R5
10k
R6
10k
R9
10k
R14
14.3k
R10
10k
R11
10k
R12
10k
R13
10k
C2
0.1 F
P2
Rx GAIN
ADJUST
2k
ZO
600
+1.8V DC
MIDCOM
671-8005
A2
A3
A4
1/2
AD8517
1/2
AD8517
1/2
AD8527
1/2
AD8527
Figure 29. A Single-Supply Direct Access Arrangement
for Modems
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