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參數(shù)資料
| 型號： | OPT101W |
| 元件分類： | 跨阻放大器 |
| 英文描述： | MONOLITHIC PHOTODIODE AND SINGLE-SUPPLY TRANSIMPEDANCE AMPLIFIER |
| 中文描述： | 整體式光電二極管和單電源互阻抗放大器 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大小： | 165K |
| 代理商： | OPT101W |
OPT101
9
1M
OPT101
3pF
2
(2)
5
4
V
S
λ
3
8
V
B
8pF
1
R
EXT
C
EXT
1M
OPT101
3pF
2
(2)
5
4
(5)
(4)
R
EXT
V
S
λ
(3)
3
8 (1)
V
B
8pF
1
C
EXT
This capacitor eliminates gain peaking and prevents
instability. The value of C
EXT
can be determined from the
table in Figure 4. Values of R
F
, other than shown in the table,
can be interpolated.
(a)-Series R
EXT
(for SIP package).
(b)-External Feedback
(for DIP package).
R
EXT
(M
)
C
EXT
(pF)
DC Gain
(x10
6
V/A)
Bandwidth
(kHz)
1
2
5
50
25
10
5
—
2
3
6
8
6
2.5
1.3
0.33
10
50
11
51
R
EXT
(M
)
C
(pF)
DC Gain
(x10
6
V/A)
Bandwidth
(kHz)
0.05
(1)
0.1
(1)
1
2
5
10
50
56
33
—
—
—
—
—
0.05
0.1
1
2
5
10
50
58
44
23
9.4
3.6
1.8
0.34
Note: (1) May require 1k
in series with pin 5 when driving
large capacitances.
FIGURE 4. Changing Responsivity with External Resistor.
FIGURE 3. Dark Error (Offset) Adjustment Circuit.
CHANGING RESPONSIVITY
An external resistor, R
EXT
, can be connected to set a different
voltage responsivity. To increase the responsivity, this resistor
can be placed in series with the internal 1M
(Figure 4a), or
with the DIP package, the external resistor can replace the
internal resistor by not connecting pin 4 (Figure 4b). The
second configuration also allows the circuit gain to be
reduced below 10
6
V/A by using external resistors of less
than 1M
.
Figure 4 includes tables showing the responsivity and
bandwidth. For values of R
F
less than 1M
, an external
capacitor, C
EXT
should be connected in parallel with R
F
.
+15V
–15V
–15V
OPA177
1M
OPT101
3pF
2
(2)
5
4
(5)
(4)
V
S
λ
(3)
3
8 (1)
V
B
8pF
1
(Pin available
on DIP only.)
Common
–V
R
1
500k
1/2 REF200
100μA
V
O
Adjust R
1
for V
= 0V
with no light.
DARK ERRORS
The dark errors in the specification table include all sources.
The dominant source of dark output voltage is the “pedestal”
voltage applied to the non-inverting input of the op amp.
This voltage is introduced to provide linear operation in the
absence of light falling on the photodiode. Photodiode dark
current is approximately 2.5pA and contributes virtually no
offset error at room temperature. The bias current of the op
amp's summing junction (– input) is approximately 165pA.
The dark current will be subtracted from the amplifier's bias
current, and this residual current will flow through the
feedback resistor creating an offset. The effects of temperature
on this difference current can be seen in the typical
performance curve “(I
BIAS
– I
DARK
) vs Temperature.” The
dark output voltage can be trimmed to zero with the optional
circuit shown in Figure 3. A low impedance offset driver (op
amp) should be used to drive pin 8 (DIP) because this node
has signal-dependent currents.
Pin Numbers:
DIP (SIP)
Pin Numbers:
DIP (SIP)
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