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参数资料
| 型号： | SP8126 |
| 厂商： | EXAR CORP |
| 元件分类： | 光电元器件 |
| 英文描述： | LINEAR OUTPUT PHOTO DETECTOR |
| 封装： | 3 X 3.50 MM, COB, 8 PIN |
| 文件页数： | 4/8页 |
| 文件大小： | 90K |
| 代理商： | SP8126 |
4
Rev. 6/02/03
SP8126 High Speed Differential APC Amplifier
Copyright 2003 Sipex Corporation
The
±6dB Gain adjustment is therefore done
directly in the TIA, by adjusting the active
feedback blocks proportional with the gain set-
ting resistor. The external resistor is not directly
in the signal path, and therefore any parasitic
from the off-chip connections does not affect
the signal quality. The value of the active feed-
back is controlled tightly over supply and tem-
perature changes through a Control Block with
active feedback circuitry.
Gain control is proportional with the external
resistor, so the lowest value of RGAIN will pro-
duce the -6dB gain adjustment and the highest
value will produce the +6dB gain adjustment.
Please consult the specification table for the
required RGAIN values.
Buffer
This stage buffers the differential signal from
the TIA to the VOUT pins and refers the signal to
the internal reference voltage. A balanced cur-
rent feedback amplifier is used for this purpose
to achieve high slew rate and fast settling.
The buffer is designed to drive high capacitive
loads. The maximum load is 50pF bulk. The
actual load is typically a flexible printed circuit
(FPC) that acts like a transmission line. This
presents a distributed capacitive load plus in-
ductance and resistance. In this case care should be
taken to match the characteristic impedance of the
line at the far end to avoid standing waves and
ringing. The buffer is designed to drive 1k
to
ground. However, this resistor can be adjusted in
value to accommodate the characteristic imped-
ance of the signal trace. The output buffer ampli-
fier is designed to be stable without load and with
loads up to 50pF lumped capacitance.
11.0k
10.0k
9.0k
8.0k
7.0k
6.0k
5.0k
4.0k
3.0k
2.0k
1.0k
0.0k
RGAIN
0.0
500
1.0k
1.5k
2.0k
2.5k
3.0k
(V/W)
180M
160M
140M
120M
100M
80M
60M
40M
0.0
500
1.0k
1.5k
2.0k
2.5k
RGAIN
-9.5dB
0.0dB
6 .0dB
9.5dB
-6.0dB
(Hz)
Figure 3. SP8126 Bandwidth versus RGAIN
TABLE 1: APC SYSTEM GUARANTEED AND TARGET GAIN SET POINTS.
VOUTP-VOUTN = 2VP-P, VCC = 5V, T = 27°C
Gain
Sensitivity
RGAIN
Ts 1%
BW
Pin
Specification
(dB)
(V/W)
(
)
(nS)
(MHz)
(
W)
+9.5
9000
2300
14
45
223
Target
+6
6000
1230
10
68
335
Guaranteed
0
3000
510
7
119
666
Guaranteed
-6
1500
215
5.5
160
1331
Guaranteed
-9.5
1000
125
5
162
1988
Target
Figure 2. Sensitivity
THEORY OF OPERATION: Continued
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相关代理商/技术参数 |
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|---|---|
| SP8126B | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Differential APC Amplifier |
| SP8126CB-3 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Differential APC Amplifier |
| SP8127 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Differential APC Amplifier |
| SP8127DG | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Differential APC Amplifier |
| SP8127N | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Differential APC Amplifier |
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