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參數(shù)資料
| 型號： | AD8510AR |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/20頁 |
| 文件大小： | 0K |
| 描述： | IC OPAMP JFET 8MHZ PREC LN 8SOIC |
| 產(chǎn)品變化通告： | Product Discontinuance 27/Oct/2011 |
| 設(shè)計資源： | Versatile High Precision Programmable Current Sources Using DACs, Op Amps, and MOSFET Transistors (CN0151) |
| 標(biāo)準(zhǔn)包裝： | 98 |
| 放大器類型： | J-FET |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 20 V/µs |
| 增益帶寬積： | 8MHz |
| 電流 - 輸入偏壓： | 25pA |
| 電壓 - 輸入偏移： | 100µV |
| 電流 - 電源： | 2.2mA |
| 電流 - 輸出 / 通道： | 70mA |
| 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-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 管件 |
AD8510/AD8512/AD8513
Rev. I | Page 18 of 20
TIME (2ms/DIV)
VOL
TA
G
E
(
5V/
D
IV)
02
72
9-
0
50
The AD8510 single has two additional active terminals that are
not present on the AD8512 dual or AD8513 quad parts. These
pins are labeled “null” and are used for fine adjustment of the
input offset voltage. Although the guaranteed maximum offset
voltage at room temperature is 400 μV and over the 40°C to
+125°C range is 800 mV maximum, this offset voltage can be
reduced by adding a potentiometer to the null pins as shown in
Figure 58. With the 20 kΩ potentiometer shown, the adjustment
range is approximately ±3.5 mV. The potentiometer parallels
low value resistors in the drain circuit of the JFET differential
input pair and allows unbalancing of the drain currents to
change the offset voltage. If offset adjustment is not required,
these pins should be left unconnected.
Caution should be used when adding adjusting potentiometers to
any op amp with this capability for several reasons. First, there is
gain from these nodes to the output; therefore, capacitive coupling
from noisy traces to these nodes will inject noise into the signal
path. Second, the temperature coefficient of the potentiometer
will not match the temperature coefficient of the internal resistors,
so the offset voltage drift with temperature will be slightly affected.
Third, this provision is for adjusting the offset voltage of the
op amp, not for adjusting the offset of the overall system. Although
it is tempting to decrease the value of the potentiometer to attain
more range, this will adversely affect the dc and ac parameters.
Instead, increase the potentiometer to 50 kΩ to decrease the
range if needed.
Figure 55. Pulse-Width Modulation
Crosstalk
Crosstalk, also known as channel separation, is a measure of
signal feedthrough from one channel to another on the same
IC. The AD8512/AD8513 have a channel separation of better
than 90 dB for frequencies up to 10 kHz and of better than
50 dB for frequencies up to 10 MHz. Figure 57 shows the
typical channel separation behavior between Amplifier A
(driving amplifier) and each of the following: Amplifier B,
Amplifier C, and Amplifier D.
VOUT
1
2
7
6
5
4
3
8
+VS
20k
2.2k
5k
–VS
VIN
18V p-p
CROSSTALK = 20 log
VOUT
10VIN
02
72
9-
05
2
1
5
4
7
3
6
2
AD8510
INPUT
OUTPUT
V+
VOS TRIM RANGE IS
TYPICALLY ±3.5mV
20k
V–
–
+
0
27
29
-0
58
Figure 56. Crosstalk Test Circuit
02
72
9-
0
5
1
FREQUENCY (Hz)
CHANNE
L
S
E
P
A
R
A
T
ION
(
d
B
)
100
–160
10k
–140
–120
–80
1k
–60
–20
–40
100k
1M
10M
–100
0
CH D
CH C
CH B
Figure 58. Optional Offset Nulling Circuit
Figure 57. Channel Separation
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