参数资料
| 型号： | AD8015AR |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/8页 |
| 文件大小： | 0K |
| 描述： | IC AMP TRANSIMPEDANCE 8-SOIC |
| 标准包装： | 98 |
| 放大器类型： | 转阻 |
| 电路数： | 1 |
| 输出类型： | 差分 |
| 增益带宽积： | 240MHz |
| 电流 - 电源： | 25mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 11 V，±2.25 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
REV. A
–4–
AD8015
SONET OC-3 SENSITIVITY ANALYSIS
OC-3 Minimum Bandwidth = 0.7
× 155 MHz ≈ 110 MHz
Total Current Noise = (
π/2) × 26.5 nA
= 42 nA (assuming single pole response)
To maintain a BER < 1
× 10–10 (1 error per 10 billion bits):
Minimum current level needs to be > 13
× Total Current Noise
= 541 nA (peak)
Assume a typical photodiode current/power conversion ratio
= 0.85 A/W
Sensitivity (minimum power level) = 541/0.85 nW
= 637 nW (peak)
= –32.0 dBm (peak)
= –35.0 dBm (average)
The SONET OC-3 specification allows for a minimum power
level of –31 dBm peak, or –34 dBm average. Using the AD8015
provides 1 dB margin.
FDDI SENSITIVITY ANALYSIS
FDDI Minimum Bandwidth = 0.7
× 125 MHz ≈ 88 MHz
Total Current Noise
= (π / 2) ×
88 MHz
100 MHz
× 26.5nA
= 39 nA (assuming single pole response)
To maintain a BER < 2.5
× 10–10 (1 error per 4 billion bits):
Minimum current level needs to be > 12.6
× Total Current Noise
= 492 nA (peak)
Assume a typical photodiode current/power conversion ratio
= 0.85 A/W
Sensitivity (minimum power level) = 492/0.85 nW
= 579 nW (peak)
= –32.4 dBm (peak)
= –35.4 dBm (average)
The FDDI specification allows for a minimum power level of
–28 dBm peak, or –31 dBm average. Using the AD8015 pro-
vides 4.4 dB margin.
THEORY OF OPERATION
The simplified schematic is shown in Figure 5. Q1 and Q3 make
up the input stage, with Q3 running at 300
A and Q1 running
at 2.7 mA. Q3 runs essentially as a grounded emitter. A large
capacitor (0.01
F) placed from V
BYP to the positive supply
shorts out the noise of R17, R21, and Q16. The first stage of the
amplifier (Q3, R2, Q4, and C1) functions as an integrator, inte-
grating current into the IIN pin. The integrator drives a differen-
tial stage (Q5, Q6, R5, R3, and R4) with gains of +3 and –3.
The differential stage then drives emitter followers (Q41, Q42,
Q60 and Q61). The positive output of the differential stage pro-
vides the feedback by driving RFB. The differential outputs are
buffered using Q7 and Q8.
The bandwidth of the AD8015 is set to within +20% of the
nominal value, 240 MHz, by factory trimming R5 to 60
. The
following formula describes the AD8015 bandwidth:
Bandwidth = 1/(2
π × C1 × R
FB
× (R5 + 2 re)/R4)
where re (of Q5 and Q6) = 9
each, constant over temperature,
and RFB/R4 = 43.5, constant over temperature.
The bandwidth equation simplifies, and the bandwidth depends
only on the value of C1:
Bandwidth = 1/(2
π × 3393 × C1).
Q3
INPUT
CLAMPS
Q1
IIN
Q16
R17
635
R1
300
R21
1.8k
VBYP
R2
3k
+VS
I10
0.75MA
C1 0.2pF
Q4
Q5
Q56
I1
1.5MA
I2
3MA
R5 60
R3
230
Q41
RFB
Q6
R4
230
Q7
+VS
Q42
Q8
330
–VS
+OUTPUT
R44 50
R43 50
I3
1MA
I4
3MA
I5
3MA
I6
1MA
I7
1MA
I8
1MA
I9
1MA
10k
Q61
Q60
–OUTPUT
Figure 5. AD8015 Simplified Schematiic
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| AD8015ARZ | 功能描述:IC AMP TRANSIMPEDANCE 8-SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:45nA 电压 - 输入偏移:2000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:40mA 电压 - 电源，单路/双路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:带卷 (TR) 其它名称:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
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