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参数资料
| 型号： | AD652SQ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/28页 |
| 文件大小： | 779K |
| 描述： | IC V-F CONV SYNCH MONO 5V 16CDIP |
| 标准包装： | 1 |
| 类型： | 电压至频率 |
| 频率 - 最大： | 2MHz |
| 全量程： | ±25ppm/°C |
| 线性： | ±0.005% |
| 安装类型： | 通孔 |
| 封装/外壳： | 16-CDIP（0.300"，7.62mm） |
| 供应商设备封装： | 16-CDIP |
| 包装： | 管件 |
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AD652
Rev. C | Page 14 of 28
SINGLE-SUPPLY OPERATION
In addition to the Digital Ground being connected to V
S
, it is
also possible to connect Analog Ground to V
S
of the AD652.
Thus, the device is truly operating from a single-supply voltage
that can range from 12 V to 36 V. This is shown in Figure 21 for
a positive voltage input, and in Figure 20 for a negative voltage
input.
In Figure 21, the comparator reference is used as a derived
ground; the input voltage is referred to this point as well as to
the op amp common mode (Pin 6 is tied to Pin 16). Since the
input signal source must drive 0.5 mA of full-scale signal
current into Pin 7, it must also draw the exact same current
from the input reference potential. This current is therefore
provided by the 5 V reference.
In single-supply operation, an external resistor, RPULLUP, is
necessary between the power supply, +V
S
, and the 5 V reference
output. This resistor should be selected such that a current of
approximately 500 礎 flows during operation. For example,
with a power supply voltage of +15 V, a 20 k& resistor is selected
((15 V5 V)/500 礎 = 20 k&).
Figure 20 shows the negative voltage input configuration for
using the AD652 in single-supply mode. In this mode, the signal
source is driving the + input of the op amp, which requires only
20 nA (typical) compared to the 0.5 mA required in the positive
input voltage configuration. The voltage at Pin 6 may go as low
as 4 V above ground (V
S
Pin 8). Since the input reference is 5.0
V above ground, this leaves a 1 V window for the input signal.
To drive the integrating capacitor with a 0.5 mA full-scale
current, it is necessary to provide an external 2 k& resistor. This
results in a 2 k& resistor and a 1 V input range. The external
2 k& resistor should be a low TC metal-film type for lowest
drift degradation.
+V
S
1
2
3
4
+
5
6
7
8
16
15
14
13
12
11
10
9
ONE
SHOT
AND
"D"
FLOP
Q CK
D
Q
1mA
20k&
2k&
AD652
SYNCHRONOUS
VOLTAGE-TO-
FREQUENCY
CONVERTER
5V
REFERENCE
R
L
5V
CLOCK
ANALOG
GND
DIGITAL
GND
C
OS
C
INT
SIGNAL
SOURCE
1V FULL SCALE
INPUT
REFERENCE
R
PULLUP
Figure 20. Single-Supply Mode Negative Voltage Input
+V
S
1
2
3
4
+
5
6
7
8
16
15
14
13
12
11
10
9
ONE
SHOT
AND
"D"
FLOP
Q CK
D
Q
1mA
20k&
AD652
SYNCHRONOUS
VOLTAGE-TO-
FREQUENCY
CONVERTER
5V
REFERENCE
R
L
5V
CLOCK
ANALOG
GND
DIGITAL
GND
FREQ
OUT
C
OS
C
INT
SIGNAL
SOURCE
ANALOG
GND
I
SIGNAL
0.5mA
FULL SCALE
INPUT
REFERENCE
R
PULLUP
I
SIGNAL
Figure 21. Single-Supply Mode Positive Voltage Input
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD652SQ/883B | 功能描述:电压频率转换及频率电压转换 IC - SYNC V/F CONVERTER RoHS:否 制造商:Texas Instruments 全标度频率:4000 KHz 线性误差:+/- 1 % FSR 电源电压-最大: 电源电压-最小: 最大工作温度:+ 85 C 最小工作温度:- 25 C 安装风格:Through Hole 封装 / 箱体:PDIP-14 封装:Tube |
| AD652SQ/883B2 | 制造商:AD 制造商全称:Analog Devices 功能描述:Monolithic Synchronous Voltage-to-Frequency Converter |
| AD652SQ2 | 制造商:AD 制造商全称:Analog Devices 功能描述:Monolithic Synchronous Voltage-to-Frequency Converter |
| AD652SQ883B2 | 制造商:AD 制造商全称:Analog Devices 功能描述:Monolithic Synchronous Voltage-to-Frequency Converter |
| AD652SW | 制造商:AD 制造商全称:Analog Devices 功能描述:Monolithic Synchronous Voltage-to-Frequency Converter |
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