2002 Microchip Technology Inc.
DS21483B-page 1
TC9400/9401/9402
Features
VOLTAGE-TO-FREQUENCY
Choice of Linearity
- TC9401: 0.01%
- TC9400: 0.05%
- TC9402: 0.25%
DC to 100kHz (F/V) or 1Hz to 100kHz (V/F)
Low Power Dissipation: 27mW (Typ.)
Single/Dual Supply Operation
- +8V to +15V or 4V to 7.5V
Gain Temperature Stability: 25 ppm/C (Typ.)
Programmable Scale Factor
FREQUENCY-TO-VOLTAGE
Operation: DC to 100kHz
Choice of Linearity
- TC9401: 0.02%
- TC9400: 0.05%
- TC9402: 0.25%
Programmable Scale Factor
Applications
P Data Acquisition
13-bit Analog-to-Digital Converters
Analog Data Transmission and Recording
Phase Locked Loops
Frequency Meters/Tachometer
Motor Control
FM Demodulation
Device Selection Table
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
proportional voltage output.
A complete V/F or F/V system only requires the addi-
tion of two capacitors, three resistors, and reference
voltage.
Package Type
Part
Number
Linearity
(V/F)
Package
Temperature
Range
TC9400COD
0.05%
14-Pin SOIC
(Narrow)
0C to +70C
TC9400CPD
0.05%
14-Pin PDIP
0C to +70C
TC9400EJD
0.05%
14-Pin CerDIP
-40C to +85C
TC9401CPD
0.01%
14-Pin PDIP
0C to +70C
TC9401EJD
0.01%
14-Pin CerDIP
-40C to +85C
TC9402CPD
0.25%
14-Pin PDIP
0C to +70C
TC9402EJD
0.25%
14-Pin CerDIP
C to +85C
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
DD
NC
AMPLIFIER OUT
THRESHOLD
DETECTOR
FREQ/2 OUT
OUTPUT COMMON
PULSE FREQ OUT
AMPLIFIER OUT
THRESHOLD
DETECTOR
FREQ/2 OUT
OUTPUT COMMON
PULSE FREQ OUT
I
BIAS
ZERO ADJ
I
IN
V
SS
V
REF
OUT
GND
V
REF
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
DD
NC
I
BIAS
ZERO ADJ
I
IN
V
SS
V
REF
OUT
GND
V
REF
TC9400
TC9401
TC9402
14-Pin Plastic DIP/CERDIP
14-Pin SOIC
TC9400
TC9401
TC9402
NC = No Internal Connection
Voltage-to-Frequency/Frequency-to-Voltage Converters
TC9400/9401/9402
DS21483B-page 2
2002 Microchip Technology Inc.
Functional Block Diagram
I
IN
I
REF
TC9400
R
IN
Integrator
Op Amp
Integrator
Capacitor
Threshold
Detector
One
Shot
Pulse Output
Pulse/2 Output
2
Input
Voltage
Reference
Capacitor
Reference
Voltage
2002 Microchip Technology Inc.
DS21483B-page 3
TC9400/9401/9402
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
V
DD
V
SS
........................................................... +18V
I
IN
........................................................................ 10mA
V
OUT
MAX
V
OUT
Common...................................... 23V
V
REF
V
SS
..........................................................-1.5V
Storage Temperature Range .............. -65C to +150C
Operating Temperature Range:
C Device ........................................... 0C to +70C
E Device......................................... -40C to +85C
Package Dissipation (T
A
70C):
8-Pin CerDIP .............................................. 800mW
8-Pin Plastic DIP ........................................ 730mW
8-Pin SOIC ................................................. 470mW
*Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device. These
are stress ratings only and functional operation of the device
at these or any other conditions above those indicated in the
operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
TC940X ELECTRICAL SPECIFICATIONS
Electrical Characteristics: V
DD
= +5V, V
SS
= -5V, V
GND
= 0V, V
REF
= -5V, R
BIAS
= 100k
, Full Scale = 10kHz, unless otherwise
specified. T
A
= +25C, unless temperature range is specified (-40C to +85C for E device, 0C to +70C for C device).
Parameter
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Units
Test Conditions
Voltage-to-Frequency
Accuracy
TC9400
TC9401
TC9402
Linearity 10kHz
--
0.01
0.05
--
0.004
0.01
--
0.05
0.25
%
Full Scale
Output Deviation from
Straight Line Between
Normalized Zero and
Full Scale Input
Linearity 100kHz
--
0.1
0.25
--
0.04
0.08
--
0.25
0.5
%
Full Scale
Output Deviation from
Straight Line Between
Normalized Zero Read-
ing and Full Scale Input
Gain Temperature
Drift (Note 1)
--
25
40
--
25
40
--
50
100
ppm/C
Full Scale
Variation in Gain A due
to Temperature Change
Gain Variance
--
10
--
--
10
--
--
10
--
% of
Nominal
Variation from Ideal
Accuracy
Zero Offset
(Note 2)
--
10
50
--
10
50
--
20
100
mV
Correction at Zero
Adjust for Zero Output
when Input is Zero
Zero Temperature
Drift (Note 1)
--
25
50
--
25
50
--
50
100
V/C
Variation in Zero Offset
Due to Temperature
Change
Note
1:
Full temperature range; not tested.
2:
I
IN
= 0.
3:
Full temperature range, I
OUT
= 10mA.
4:
I
OUT
= 10
A.
5:
Threshold Detect = 5V, Amp Out = 0V, full temperature range.
6:
10Hz to 100kHz; not tested.
7:
5
sec minimum positive pulse width and 0.5
sec minimum negative pulse width.
8:
t
R
= t
F
= 20nsec.
9:
R
L
2k
, tested @ 10k
.
10: Full temperature range, V
IN
= -0.1V.
TC9400/9401/9402
DS21483B-page 4
2002 Microchip Technology Inc.
Analog Input
I
IN
Full Scale
--
10
--
--
10
--
--
10
--
A
Full Scale Analog Input
Current to achieve
Specified Accuracy
I
IN
Over Range
--
--
50
--
--
50
--
--
50
A
Over Range Current
Response Time
--
2
--
--
2
--
--
2
--
Cycle
Settling Time to 0.1%
Full Scale
Digital Section
TC9400
TC9401
TC9402
V
SAT
@ I
OL
= 10mA
--
0.2
0.4
--
0.2
0.4
--
0.2
0.4
V
Logic "0" Output
Voltage (Note 3)
V
OUT
MAX
V
OUT
Common (Note 4)
--
--
18
--
--
18
--
--
18
V
Voltage Range
Between Output and
Common
Pulse Frequency
Output Width
--
3
--
--
3
--
--
3
--
sec
Frequency-to-Voltage
Supply Current
I
DD
Quiescent
(Note 5)
--
1.5
6
--
1.5
6
--
3
10
mA
Current Required from
Positive Supply during
Operation
I
SS
Quiescent
(Note 5)
--
-1.5
-6
--
-1.5
-6
--
-3
-10
mA
Current Required from
Negative Supply during
Operation
V
DD
Supply
4
--
7.5
4
--
7.5
4
--
7.5
V
Operating Range of
Positive Supply
V
SS
Supply
-4
--
-7.5
-4
--
-7.5
-4
--
-7.5
V
Operating Range of
Negative Supply
Reference Voltage
V
REF
V
SS
-2.5
--
--
-2.5
--
--
-2.5
--
--
V
Range of Voltage
Reference Input
Accuracy
Non-Linearity
(Note 10)
--
0.02
0.05
--
0.01
0.02
--
0.05
0.25
%
Full Scale
Deviation from ideal
Transfer Function as a
Percentage Full Scale
Voltage
Input Frequency
Range
(Notes 7 and 8)
10
--
100k
10
--
100k
10
--
100k
Hz
Frequency Range for
Specified Non-Linearity
TC940X ELECTRICAL SPECIFICATIONS
(CONTINUED)
Electrical Characteristics: V
DD
= +5V, V
SS
= -5V, V
GND
= 0V, V
REF
= -5V, R
BIAS
= 100k
, Full Scale = 10kHz, unless otherwise
specified. T
A
= +25C, unless temperature range is specified (-40C to +85C for E device, 0C to +70C for C device).
Parameter
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Units
Test Conditions
Note
1:
Full temperature range; not tested.
2:
I
IN
= 0.
3:
Full temperature range, I
OUT
= 10mA.
4:
I
OUT
= 10
A.
5:
Threshold Detect = 5V, Amp Out = 0V, full temperature range.
6:
10Hz to 100kHz; not tested.
7:
5
sec minimum positive pulse width and 0.5
sec minimum negative pulse width.
8:
t
R
= t
F
= 20nsec.
9:
R
L
2k
, tested @ 10k
.
10: Full temperature range, V
IN
= -0.1V.
2002 Microchip Technology Inc.
DS21483B-page 5
TC9400/9401/9402
Frequency Input
Positive Excursion
0.4
--
V
DD
0.4
--
V
DD
0.4
--
V
DD
V
Voltage Required to
Turn Threshold
Detector On
Negative Excursion
-0.4
-2
-0.4
--
-2
-0.4
--
-2
V
Voltage Required to
Turn Threshold
Detector Off
Minimum Positive
Pulse Width
(Note 8)
--
5
--
--
5
--
--
5
--
sec
Time between
Threshold Crossings
Minimum Negative
Pulse Width
(Note 8)
--
0.5
--
--
0.5
--
--
0.5
--
sec
Time Between
Threshold Crossings
Input Impedance
--
10
--
--
10
--
--
10
M
Analog Outputs
TC9400
TC9401
TC9402
Output Voltage
(Note 9)
--
V
DD
1
--
--
V
DD
1
--
--
V
DD
1
--
V
Voltage Range of Op
Amp Output for Speci-
fied Non-Linearity
Output Loading
2
--
--
2
--
--
2
--
--
k
Resistive Loading at
Output of Op Amp
Supply Current
TC9400
TC9401
TC9402
I
DD
Quiescent
(Note 10)
--
1.5
6
--
1.5
6
--
3
10
mA
Current Required from
Positive Supply During
Operation
I
SS
Quiescent
(Note 10)
--
-1.5
-6
-1.5
-6
--
-3
-10
mA
Current Required from
Negative Supply
During Operation
V
DD
Supply
4
--
7.5
4
--
7.5
4
--
7.5
V
Operating Range of
Positive Supply
V
SS
Supply
-4
--
-7.5
-4
--
-7.5
-4
--
-7.5
V
Operating Range of
Negative Supply
Reference Voltage
V
REF
V
SS
-2.5
--
--
-2.5
--
--
-2.5
--
--
V
Range of Voltage
Reference Input
TC940X ELECTRICAL SPECIFICATIONS
(CONTINUED)
Electrical Characteristics: V
DD
= +5V, V
SS
= -5V, V
GND
= 0V, V
REF
= -5V, R
BIAS
= 100k
, Full Scale = 10kHz, unless otherwise
specified. T
A
= +25C, unless temperature range is specified (-40C to +85C for E device, 0C to +70C for C device).
Parameter
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Units
Test Conditions
Note
1:
Full temperature range; not tested.
2:
I
IN
= 0.
3:
Full temperature range, I
OUT
= 10mA.
4:
I
OUT
= 10
A.
5:
Threshold Detect = 5V, Amp Out = 0V, full temperature range.
6:
10Hz to 100kHz; not tested.
7:
5
sec minimum positive pulse width and 0.5
sec minimum negative pulse width.
8:
t
R
= t
F
= 20nsec.
9:
R
L
2k
, tested @ 10k
.
10: Full temperature range, V
IN
= -0.1V.
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