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參數資料
| 型號： | AD8620 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | Precision, Very Low Noise, Low Input Bias Current, Wide Bandwidth JFET Operational Amplifier |
| 中文描述： | 精密，非常低噪聲，低輸入偏置電流，高帶寬結型場效應管運算放大器 |
| 文件頁數： | 14/20頁 |
| 文件大小： | 414K |
| 代理商： | AD8620 |
REV. D
–14–
AD8610/AD8620
supplies of
±
5 V. Figures 24 and 25 compare the load current
versus output voltage of AD8610/AD8620 and OPA627.
LOAD CURRENT – A
10
0.1
0.00001
1
D
1
0.0001
0.001
0.01
0.1
V
EE
V
CC
Figure 24. AD8610 Dropout from
±
13 V vs. Load Current
LOAD CURRENT – A
10
0.1
0.00001
1
D
1
0.0001
0.001
0.01
0.1
V
EE
V
CC
Figure 25. OPA627 Dropout from
±
15 V vs. Load Current
Although operating conditions imposed on the AD8610 (
±
13 V)
are less favorable than the OPA627 (
±
15 V), it can be seen that the
AD8610 has much better drive capability (lower headroom to the
supply) for a given load current.
Operating with Supplies Greater than
±
13 V
The AD8610 maximum operating voltage is specified at
±
13 V.
When
±
13 V is not readily available, an inexpensive LDO can
provide
±
12 V from a nominal
±
15 V supply.
Input Offset Voltage Adjustment
Offset of AD8610 is very small and normally does not require
additional offset adjustment. However, the offset adjust pins can
be used as shown in Figure 26 to further reduce the dc offset. By
using resistors in the range of 50 k
, offset trim range is
±
3.3 mV.
R1
2
3
7
5
+V
S
V
OUT
4
6
–V
S
1
AD8610
Figure 26. Offset Voltage Nulling Circuit
Programmable Gain Amplifier (PGA)
The combination of low noise, low input bias current, low input
offset voltage, and low temperature drift make the AD8610 a
perfect solution for programmable gain amplifiers. PGAs are often
used immediately after sensors to increase the dynamic
range of
the measurement circuit. Historically, the large ON resistance
of
switches, combined with the large I
B
currents of amplifiers,
created
a large dc offset in PGAs. Recent and improved monolithic
switches
and amplifiers completely remove these problems. A PGA
discrete circuit is shown in Figure 27. In Figure 27, when the 10 pA
bias current of the AD8610 is dropped across the (<5
) R
ON
of
the switch, it results in a negligible offset error.
When high precision resistors are used, as in the circuit of Figure 27,
the error introduced by the PGA is within the 1/2 LSB requirement
for a 16-bit system.
Y0
Y1
Y2
Y3
G
A
B
5
IN1
S1
D1
10k
10k
1k
–5V
+5V
IN2
S2
D2
IN3
S3
D3
IN4
S4
D4
ADG452
3
2
14
15
11
10
6
7
V
L
V
DD
13
12
1
16
9
8
74HC139
V
SS
4
GND
5
V
OUT
1k
100
11
5pF
100
V
IN
G = 1
G = 10
G = 100
G = 1000
+5V
+5V
AD8610
U10
A0
A1
–5V
Figure 27. High Precision PGA
1. Room temperature error calculation due to R
ON
and I
B
:
Total Offset
Total Offset
Total Offset
2. Full temperature error calculation due to R
ON
and I
B
:
V
I
R
=
=
=
Offset
Offset Trimmed
5
pV
μ
V
V
OS
B
ON
AD8610
AD8610
μ
OS
OS
=
×
=
×
=
+
+
+
2
5
10
5
10
pA
pV
(
(
)
_
)
V
V
250
V
I
R
OS
B
3 75
ON
(
C)
15
(
.
C)
(
C)
pA
nV
@
@
@
85
×
85
85
°
=
°
×
°
=
=
3. Temperature coefficient of switch and AD8610/AD8620
combined is essentially the same as the T
C
V
OS
of the AD8610:
0 5
V/ C
0 5
V
V
T total
T total
(
V
.
T
V
T I
(
.
R
OS
OS
OS
B
ON
OS
/
/
(
)
)
/
(
)
nV/ C
/
)
.
V/ C
=
=
+
×
AD8610
0 06
μ
μ
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