参数资料
| 型号： | OP293FSZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/16页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP 35KHZ DUAL 8SOIC |
| 设计资源： | 4 mA-to-20 mA Loop-Powered Temperature Monitor Using ADuC7060/1 (CN0145) |
| 标准包装： | 1 |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.015 V/µs |
| 增益带宽积： | 35kHz |
| 电流 - 输入偏压： | 20nA |
| 电压 - 输入偏移： | 250µV |
| 电流 - 电源： | 30µA |
| 电流 - 输出 / 通道： | 25mA |
| 电压 - 电源，单路/双路(±)： | 1.7 V ~ 36 V，±0.85 V ~ 18 V |
| 工作温度： | -40°C ~ 125°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： | 标准包装 |
| 产品目录页面： | 768 (CN2011-ZH PDF) |
| 其它名称： | OP293FSZ-REEL7DKR |
REV. B
OP193/OP293/OP493
–13–
From the formulas, it can be seen that if the span trim is
adjusted before the zero trim, the two trims are not interactive,
which greatly simplifies the calibration procedure.
Calibration of the transmitter is simple. First, the slope of the
output current versus temperature is calibrated by adjusting the
span trim, R7. A couple of iterations may be required to be sure
the slope is correct.
Once the span trim has been completed, the zero trim can be made.
Remember that adjusting the zero trim will not affect the gain.
The zero trim can be set at any known temperature by adjusting
R5 until the output current equals:
IT
T
OUT
I
T
FS
OPERATING
AMBIENT
MIN
=
+
()
4 mA
Table I shows the values of R6 required for various temperature
ranges.
Table I. R6 Values vs. Temperature
Temp Range
R6
0
°C to 70°C
10 k
–40
°C to +85°C
6.2 k
–55
°C to +150°C3 k
A Micropower Voltage Controlled Oscillator
An OP293 in combination with an inexpensive quad CMOS
analog switch forms the precision VCO of Figure 12. This cir-
cuit provides triangle and square wave outputs and draws only
50
A from a single 5 V supply. A1 acts as an integrator; S1
switches the charging current symmetrically to yield positive and
negative ramps. The integrator is bounded by A2 which acts as
a Schmitt trigger with a precise hysteresis of 1.67 volts, set by
resistors R5, R6, and R7, and associated CMOS switches. The
resulting output of A1 is a triangle wave with upper and lower
levels of 3.33 and 1.67 volts. The output of A2 is a square wave
with almost rail-to-rail swing. With the components shown,
frequency of operation is given by the equation:
fV
V
OUT
CONTROL
=×
V
Hz
10
/
but this can easily be changed by varying C1. The circuit oper-
ates well up to 500 Hz.
8
4
1/2 OP293
1
2
3
R3
100k
VCONTROL
R4
200k
TRIANGLE
OUT
A1
5V
R1
200k
R2
200k
1/2 OP293
6
5
7
A2
SQUARE
OUT
5V
R6
200k
R7
200k
S3
S4
S1
1 IN/OUT
2 OUT/IN
CONT 12
OUT/IN
10
3 OUT/IN
S2
CONT 13
4 IN/OUT
6 CONT
5 CONT
7
VSS
IN/OUT
8
IN/OUT 11
OUT/IN
9
VDD
14
5V
CD4066
R8
200k
5V
R5
200k
C1
75nF
Figure 12. Micropower Voltage Controlled Oscillator
A Micropower, Single-Supply Quad Voltage Output 8-Bit DAC
The circuit of Figure 13 uses the DAC8408 CMOS quad 8-bit
DAC and the OP493 to form a single-supply quad voltage out-
put DAC with a supply drain of only 140
A. The DAC8408 is
used in the voltage switching mode and each DAC has an out-
put resistance (
≈10 k) independent of the digital input code.
The output amplifiers act as buffers to avoid loading the DACs.
The 100 k
resistors ensure that the OP493 outputs will swing
to within 1/2 LSB of ground, i.e.:
1
2
256
×=
1.23 V
3 mV
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