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參數(shù)資料
| 型號： | AD827AQ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP 50MHZ DUAL LP 8CDIP |
| 標準包裝： | 48 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 2 |
| 轉(zhuǎn)換速率： | 300 V/µs |
| 增益帶寬積： | 50MHz |
| 電流 - 輸入偏壓： | 3.3µA |
| 電壓 - 輸入偏移： | 300µV |
| 電流 - 電源： | 10.5mA |
| 電流 - 輸出 / 通道： | 32mA |
| 電壓 - 電源，單路/雙路(±)： | ±4.5 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 8-CDIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 8-CERDIP |
| 包裝： | 管件 |
AD827
REV. C
–7–
VIDEO LINE DRIVER
The AD827 functions very well as a low cost, high speed line
driver for either terminated or unterminated cables. Figure 23
shows the AD827 driving a doubly terminated cable in a
follower configuration.
0.1 F
50
AD827
1/2
RBT
CC
+VS
VIN
VOUT
–VS
RT
500
50
50
500
Figure 23. A Video Line Driver
The termination resistor, RT, (when equal to the cable’s
characteristic impedance) minimizes reflections from the far end
of the cable. While operating from
±5 V supplies, the AD827
maintains a typical slew rate of 200 V/
s, which means it can
drive a
±1 V, 30 MHz signal into a terminated cable.
Table I. Video Line Driver Performance Summary
Over-
VIN*
VSUPPLY
CC
–3 dB BW
shoot
0 dB or
±500 mV Step ±15
20 pF
23 MHz
4%
0 dB or
±500 mV Step ±15
15 pF
21 MHz
0%
0 dB or
±500 mV Step ±15
0 pF
13 MHz
0%
0 dB or
±500 mV Step ±5
20 pF
18 MHz
2%
0 dB or
±500 mV Step ±5
15 pF
16 MHz
0%
0 dB or
±500 mV Step ±50 pF
11 MHz
0%
*–3 dB bandwidth numbers are for the 0 dBm signal input. Overshoot numbers
are the percent overshoot of the 1 V step input.
A back-termination resistor (RBT, also equal to the characteristic
impedance of the cable) may be placed between the AD827
output and the cable input, in order to damp any reflected
signals caused by a mismatch between RT and the cable’s
characteristic impedance. This will result in a flatter frequency
response, although this requires that the op amp supply
±2 V to
the output in order to achieve a
±1 V swing at resistor RT.
A HIGH SPEED THREE OP AMP INSTRUMENTATION
AMPLIFIER CIRCUIT
The instrumentation amplifier circuit shown in Figure 24 can
provide a range of gains. Table II details performance.
–
+
–
+
–
1
3
2
3
6
7
6
5
AD847
AD827
0.1
F
1k
2k
2k
1k
2k
0.1
F
0.1
F
2k
R
L
2 – 8pF
0.1
F
R
G
4
7
2k
8
4
TRIM FOR BEST
SETTLING TIME
1/2
3pF
CIRCUIT GAIN =
+ 1
G
R
2000
TRIM FOR
OPTIMUM
BANDWIDTH
7 – 15 pF
NOTE: PINOUT SHOWN IS FOR MINIDIP PACKAGE
–V
IN
+VS
–V
S
+V
IN
+V
S
–V
S
VOUT
Figure 24. A High Bandwidth Three Op Amp
Instrumentation Amplifier
Table II. Performance Specifications for the
Three Op Amp Instrumentation Amplifier
Small Signal
Bandwidth
Gain
RG
@ 1 V p-p Output
1
Open
16.1 MHz
22 k
14.7 MHz
10
226
4.9 MHz
100
20
660 kHz
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