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| 型號： | AD652SQ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 779K |
| 描述： | IC V-F CONV SYNCH MONO 5V 16CDIP |
| 標準包裝： | 1 |
| 類型： | 電壓至頻率 |
| 頻率 - 最大： | 2MHz |
| 全量程： | ±25ppm/°C |
| 線性： | ±0.005% |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 16-CDIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 16-CDIP |
| 包裝： | 管件 |
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AD652
Rev. C | Page 15 of 28
FREQUENCY-TO-VOLTAGE CONVERTER
The AD652 SVFC also works as a frequency-to-voltage
converter. Figure 22 shows the connection diagram for F/V
conversion. In this case, the negative input of the comparator is
fed the input pulses. Either comparator input may be used so
that an input pulse of either polarity may be applied to the F/V.
In Figure 22, the + input is tied to a 1.2 V reference and low-
level TTL pulses are used as the frequency input. The pulse
must be low on the falling edge of the clock. On the subsequent
rising edge, the 1 mA current source is switched to the
integrator summing junction and ramps up the voltage at Pin 4.
Due to the action of the AND gate, the 1 mA current is switched
off after only one clock period. The average current delivered to
the summing junction varies from 0 mA to 0.5 mA; using the
internal 20 k& resistor, this results in a full-scale output voltage
of 10 V at Pin 4.
The frequency response of the circuit is determined by the
capacitor; the 3 dB frequency is simply the RC time constant.
A tradeoff exists between ripple and response. If low ripple is
desired, a large value capacitor must be used (1 礔); if fast
response is needed, a small capacitor is used (1 nF minimum).
The op amp can drive a 5 k& resistor load to 10 V, using a 15 V
positive power supply. If a large load capacitance (0.01 礔) must
be driven, it is necessary to isolate the load with a 50 & resistor
as shown. Because the 50 & resistor is 0.25% of the full scale,
and the specified gain error with the 20 k& resistor is 0.5%, this
extra resistor only increases the total gain error to 0.75% max.
The circuit shown is unipolar and only a 0 V to +10 V output is
allowed. The integrator op amp is not a general-purpose op
amp. Instead, it has been optimized for simplicity and high
speed. The most significant difference between this amplifier
and a general-purpose op amp is the lack of an integrator (or
level shift) stage.
Consequently, the voltage on the output (Pin 4) must always be
more positive than 1 V below the inputs (Pins 6 and 7). For
example, in the F-to-V conversion mode, the noninverting input
of the op amp (Pin 6) is grounded, which means the output
(Pin 4) cannot go below 1 V. Normal operation of the circuit as
shown never calls for a negative voltage at the output.
A second difference between this op amp and a general-purpose
amplifier is that the output only sinks 1.5 mA to the negative
supply. The only pull-down other than the 1 mA current used
for voltage-to-frequency conversion is a 0.5 mA source. The op
amp sources a great deal of current from the positive supply,
and is internally protected by current limiting. The op amp
output may be driven to within 4 V of the positive supply when
not sourcing external current. When sourcing 10 mA, the out-
put voltage may be driven to within 6 V of the positive supply.
CLOCK
FREQ
IN
VOLTS
OUT
LOADS ON FALLING EDGE OF CK
SHIFTS OUT ON RISING EDGE OF CL
FREQUENCY TO VOLTS CONVERTER
+V
S
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&
50&
0.01?/SPAN>F
5k&
5k&
AD652
SYNCHRONOUS
VOLTAGE-TO-
FREQUENCY
CONVERTER
5V
REFERENCE
CLOCK
5V
FREQ
IN
DIGITAL
GND
C
NC
NC
1N4148
+
OUT
Figure 22. Frequency-to-Voltage Converter
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD652SQ/883B | 功能描述:電壓頻率轉(zhuǎn)換及頻率電壓轉(zhuǎn)換 IC - SYNC V/F CONVERTER RoHS:否 制造商:Texas Instruments 全標度頻率:4000 KHz 線性誤差:+/- 1 % FSR 電源電壓-最大: 電源電壓-最小: 最大工作溫度:+ 85 C 最小工作溫度:- 25 C 安裝風格:Through Hole 封裝 / 箱體:PDIP-14 封裝:Tube |
| AD652SQ/883B2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Monolithic Synchronous Voltage-to-Frequency Converter |
| AD652SQ2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Monolithic Synchronous Voltage-to-Frequency Converter |
| AD652SQ883B2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Monolithic Synchronous Voltage-to-Frequency Converter |
| AD652SW | 制造商:AD 制造商全稱:Analog Devices 功能描述:Monolithic Synchronous Voltage-to-Frequency Converter |
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