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PDF TC9401CPD Data sheet ( Hoja de datos )
| Número de pieza | TC9401CPD | |
| Descripción | VOLTAGE-TO-FREQUENCY/FREQUENCY-TO-VOLTAGE CONVERTERS | |
| Fabricantes | TelCom Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TC9401CPD (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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1TC9400
TC9401
TC9402
VOLTAGE-TO-FREQUENCY/FREQUENCY-TO-VOLTAGE CONVERTERS
FEATURES
Voltage-to-Frequency
s Choice of Guaranteed Linearity:
TC9401 ......................................................... 0.01%
TC9400 ......................................................... 0.05%
TC9402 ......................................................... 0.25%
s DC to 100 kHz (F/V) or 1Hz to 100kHz (V/F)
s Low Power Dissipation .......................... 27mW Typ
s Single/Dual Supply Operation .................................
+ 8V to + 15V or ± 4V to ± 7.5V
s Gain Temperature Stability .......... ± 25 ppm/°C Typ
s Programmable Scale Factor
Frequency-to-Voltage
s Operation ........................................... DC to 100 kHz
s Choice of Guaranteed Linearity:
TC9401 ......................................................... 0.02%
TC9400 ......................................................... 0.05%
TC9402 ......................................................... 0.25%
s Programmable Scale Factor
APPLICATIONS
s µP Data Acquisition
s 13-Bit Analog-to-Digital Converters
s Analog Data Transmission and Recording
s Phase-Locked Loops
s Frequency Meters/Tachometer
s Motor Control
s FM Demodulation
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
The TC9400/TC9401/TC9402 are low-cost voltage-to-
frequency (V/F) converters utilizing low power CMOS
technology. The converters accept a variable analog input
signal and generate an output pulse train whose frequency
is linearly proportional to the input voltage.
The devices can also be used as highly-accurate fre-
quency-to-voltage (F/V) converters, accepting virtually any
input frequency waveform and providing a linearly-propor-
tional voltage output.
A complete V/F or F/V system only requires the addition
of two capacitors, three resistors, and reference voltage.
ORDERING INFORMATION
Part No.
Linearity
(V/F)
TC9400COD 0.05%
TC9400CPD 0.05%
TC9400EJD 0.05%
TC9401CPD 0.01%
TC9401EJD 0.01%
TC9402CPD 0.25%
TC9402EJD 0.25%
Package
Temperature
Range
14-Pin
0°C to +70°C
SOIC (Narrow)
14-Pin
0°C to +70°C
Plastic DIP
14-Pin
– 40°C to +85°C
CerDIP
14-Pin
0°C to +70°C
Plastic DIP
14-Pin
– 40°C to +85°C
CerDIP
14-Pin
0°C to +70°C
Plastic DIP
14-Pin
– 40°C to +85°C
CerDIP
2
3
4
5
6
Integrator
Capacitor
Input
Voltage
RIN
IIN
Reference
Capacitor
Integrator
OpAmp
Threshold
Detector
TC9400
One
Shot
÷2
Pulse Output
Pulse/2 Output
7
IREF
Reference
Voltage
TELCOM SEMICONDUCTOR, INC.
8
TC9400/1/2-5 11/6/96
3-287
1 page  
VOLTAGE-TO-FREQUENCY/
FREQUENCY-TO-VOLTAGE CONVERTERS
TC9400
TC9401
TC9402
1
THRESHOLD
11 DETECT
+5V
14
VDD
THRESHOLD
DETECTOR
3µsec
DELAY
–3V
12 AMP OUT
SELF-
START
+5V
fOUT 8
RL
10kΩ
+5V
fOUT/2 10
RL
10kΩ
÷2 9
OUTPUT
COMMON
5 VREF OUT
INPUT
VIN
CINT
820pF
RIN
1MΩ
CREF
180pF
12pF
3 IIN
0V –10V
50kΩ
+5V
510kΩ
ZERO
2 ADJUST
–5V
OFFSET
ADJUST
10kΩ
20kΩ
60pF
–
OpAmp
+
IBIAS
1
RBIAS
100kΩ
TC9400
TC9401
TC9402
VSS
4
VREF
7
GND
6
REFERENCE
VOLTAGE
(TYPICALLY –5V)
–5V
Figure 1. 10 Hz to 10 kHz V/F Converter
2
3
4
5
6
VOLTAGE-TO-FREQUENCY (V/F)
CIRCUIT DESCRIPTION
The TC9400 V/F converter operates on the principal
of charge balancing. The operation of the TC9400 is easily
understood by referring to Figure 1. The input voltage (VIN)
is converted to a current (IIN) by the input resistor. This
current is then converted to a charge on the integrating
capacitor and shows up as a linearly decreasing voltage at
the output of the op amp. The lower limit of the output
swing is set by the threshold detector, which causes the
reference voltage to be applied to the reference capacitor
for a time period long enough to charge the capacitor to
the reference voltage. This action reduces the charge on
the integrating capacitor by a fixed amount (q = CREF ×
VREF), causing the op amp output to step up a finite
amount.
TELCOM SEMICONDUCTOR, INC.
At the end of the charging period, CREF is shorted out.
This dissipates the charge stored on the reference capaci-
tor, so that when the output again crosses zero the system
is ready to recycle. In this manner, the continued discharg-
ing of the integrating capacitor by the input is balanced out
by fixed charges from the reference voltage. As the input
voltage is increased, the number of reference pulses re-
quired to maintain balance increases, which causes the
output frequency to also increase. Since each charge in-
crement is fixed, the increase in frequency with voltage is
linear. In addition, the accuracy of the output pulse width
does not directly affect the linearity of the V/F. The pulse
must simply be long enough for full charge transfer to take
place.
7
8
3-291
5 Page 
VOLTAGE-TO-FREQUENCY/
FREQUENCY-TO-VOLTAGE CONVERTERS
1
TC9400
TC9401
TC9402
fIN
SEE
FIGURE
6
TC9400A
TC9401A
TC9402A
+5V
14
VDD
Ϭ2
THRESHOLD
DETECT
11
3 µsec
DELAY
THRESHOLD
DETECTOR
OFFSET
ADJUST
+5V
2 kΩ
–5V
100kΩ 2 ZERO ADJUST
2.2kΩ
IBIAS
1
10 kΩ
VSS
4
VREF
7
–
OP
AMP
+
VREF
(TYPICALLY –5V)
Figure 7. DC — 10 kHz F/V Converter
2V+
fOUT/2 10
*
OUTPUT
V+
COMMON 9 *
fOUT 8
*
* OPTIONAL
IF BUFFER
IS NEEDED
VREF
OUT 5
12pF
IIN 3
60pF
AMP
OUT 12
CREF
56 pF
SEE
EQUATION,
PAGE 12
RINT
1 MΩ
CINT
1000pF
VO
3
4
5
GND
6
6
0.5µsec
MIN
INPUT
fOUT
fOUT/2
5.0µsec
MIN
DELAY = 3µsec
Figure 8 . F/V Digital Outputs
TELCOM SEMICONDUCTOR, INC.
Input Buffer
fOUT and fOUT/2 are not used in the F/V mode. However,
these outputs may be useful for some applications, such as
a buffer to feed additional circuitry. Then, fOUT will follow the
input frequency waveform, except that fOUT will go high
3µsec after fIN goes high; fOUT/2 will be squarewave with a
frequency of one-half fOUT.
If these outputs are not used, pins 8, 9 and 10 should be
connected to ground.
7
8
3-297
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet TC9401CPD.PDF ] | |
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