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| 型号： | AD745KR-16-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/12页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP BIFET 20MHZ ULN 16SOIC |
| 标准包装： | 1,000 |
| 放大器类型： | J-FET |
| 电路数： | 1 |
| 转换速率： | 12.5 V/µs |
| 增益带宽积： | 20MHz |
| -3db带宽： | 20MHz |
| 电流 - 输入偏压： | 150pA |
| 电压 - 输入偏移： | 100µV |
| 电流 - 电源： | 8mA |
| 电流 - 输出 / 通道： | 40mA |
| 电压 - 电源，单路/双路(±)： | 9.6 V ~ 36 V，±4.8 V ~ 18 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 带卷 (TR) |
REV. D
AD745
–9–
HOW CHIP PACKAGE TYPE AND POWER DISSIPATION
AFFECT INPUT BIAS CURRENT
As with all JFET input amplifiers, the input bias current of the
AD745 is a direct function of device junction temperature, IB
approximately doubling every 10
°C. Figure 9 shows the rela-
tionship between bias current and junction temperature for the
AD745. This graph shows that lowering the junction tempera-
ture will dramatically improve IB.
JUNCTION TEMPERATURE – C
10–6
–60
INPUT
BIAS
CURRENT
–
Amps
10–7
10–8
10–9
10–10
10–11
10–12
–40
–20
0
20
40
60
80
100
120
140
VS = 15V
TA = 25 C
Figure 9. Input Bias Current vs. Junction Temperature
The dc thermal properties of an IC can be closely approximated
by using the simple model of Figure 10 where current represents
power dissipation, voltage represents temperature, and resistors
represent thermal resistance (
θ in °C/watt).
TA
JA
JC
CA
TJ
PIN
WHERE:
PIN = DEVICE DISSIPATION
TA = AMBIENT TEMPERATURE
TJ = JUNCTION TEMPERATURE
JC = THERMAL RESISTANCE – JUNCTION TO CASE
CA = THERMAL RESISTANCE – CASE TO AMBIENT
Figure 10. Device Thermal Model
From this model TJ = TA+
θJA PIN. Therefore, IB can be deter-
mined in a particular application by using Figure 9 together with
the published data for
θ
JA and power dissipation. The user can
modify
θJA by use of an appropriate clip-on heat sink such as the
Aavid #5801. Figure 11 shows bias current versus supply voltage
with
θ
JA as the third variable. This graph can be used to predict
bias current after
θJA has been computed. Again bias current will
double for every 10
°C.
SUPPLY VOLTAGE –
Volts
300
515
10
INPUT
BIAS
CURRENT
–
Amps
200
100
0
TA = 25 C
JA = 165 C/W
JA = 115 C/W
JA = 0 C/W
Figure 11. Input Bias Current vs. Supply Voltage for
Various Values of
θJA
A
(J TO DIE
MOUNT)
B
(DIE MOUNT
TO CASE)
A +
B =
JC
TJ
TA
CASE
Figure 12. Breakdown of Various Package Thermal
Resistance
REDUCED POWER SUPPLY OPERATION FOR
LOWER IB
Reduced power supply operation lowers IB in two ways: first, by
lowering both the total power dissipation and, second, by reduc-
ing the basic gate-to-junction leakage (Figure 11). Figure 13
shows a 40 dB gain piezoelectric transducer amplifier, which
operates without an ac coupling capacitor, over the –40
°C to
+85
°C temperature range. If the optional coupling capacitor,
C1, is used, this circuit will operate over the entire –55
°C to
+125
°C temperature range.
+5V
–5V
CT**
C1*
100
10k
108 **
CT
108
TRANSDUCER
*OPTIONAL DC BLOCKING CAPACITOR
**OPTIONAL, SEE TEXT
AD745
Figure 13. A Piezoelectric Transducer
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| AD745KR-16-REEL7 | 功能描述:IC OPAMP BIFET 20MHZ ULN 16SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:Excalibur™ 放大器类型:J-FET 电路数:1 输出类型:- 转换速率:45 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:20pA 电压 - 输入偏移:490µV 电流 - 电源:1.7mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):4.5 V ~ 38 V，±2.25 V ~ 19 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:带卷 (TR) |
| AD745KRZ-16 | 功能描述:IC OPAMP BIFET 20MHZ ULN 16SOIC 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 |
| AD745KRZ-16-REEL | 功能描述:IC OPAMP BIFET 20MHZ ULN 16SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:Excalibur™ 放大器类型:J-FET 电路数:1 输出类型:- 转换速率:45 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:20pA 电压 - 输入偏移:490µV 电流 - 电源:1.7mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):4.5 V ~ 38 V，±2.25 V ~ 19 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:带卷 (TR) |
| AD745KRZ-16-REEL7 | 功能描述:IC OPAMP BIFET 20MHZ ULN 16SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:Excalibur™ 放大器类型:J-FET 电路数:1 输出类型:- 转换速率:45 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:20pA 电压 - 输入偏移:490µV 电流 - 电源:1.7mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):4.5 V ~ 38 V，±2.25 V ~ 19 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:带卷 (TR) |
| ad745sq | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述: |
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