TC9400/9401/9402
Voltage-to-Frequency / Frequency-to-Voltage Converters
Features:
VOLTAGE-TO-FREQUENCY
• Choice of Linearity:
- TC9401: 0.01%
- TC9400: 0.05%
- TC9402: 0.25%
• DC to 100 kHz (F/V) or 1 Hz to 100 kHz (V/F)
• Low Power Dissipation: 27 mW (Typ.)
• Single/Dual Supply Operation:
- +8V to +15V or ±4V to ±7.5V
• Gain Temperature Stability: ±25 ppm/°C (Typ.)
• Programmable Scale Factor
General Description:
The TC9400/9401/9402 are low-cost Voltage-to-Fre-
quency (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
Frequency-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
addition of two capacitors, three resistors, and refer-
ence voltage.
FREQUENCY-TO-VOLTAGE
• Operation: DC to 100 kHz
• Choice of Linearity:
- TC9401: 0.02%
- TC9400: 0.05%
- TC9402: 0.25%
• Programmable Scale Factor
Package Type
14-Pin Plastic DIP/CERDIP
I
BIAS
1
ZERO ADJ 2
I
IN
3
V
SS
4
14 V
DD
13 NC
Applications:
•
•
•
•
•
•
•
Microprocessor Data Acquisition
13-bit Analog-to-Digital Converters (ADC)
Analog Data Transmission and Recording
Phase Locked Loops
Frequency Meters/Tachometer
Motor Control
FM Demodulation
V
REF
OUT 5
GND 6
V
REF
7
TC9400
TC9401
TC9402
12 AMPLIFIER OUT
THRESHOLD
11 DETECTOR
10 FREQ/2 OUT
9 OUTPUT COMMON
8 PULSE FREQ OUT
14-Pin SOIC
I
BIAS
ZERO ADJ
I
IN
V
SS
V
REF
OUT
GND
V
REF
1
2
3
4
5
6
7
14
13
V
DD
NC
AMPLIFIER OUT
THRESHOLD
DETECTOR
FREQ/2 OUT
OUTPUT COMMON
PULSE FREQ OUT
TC9400
TC9401
TC9402
12
11
10
9
8
NC = No Internal Connection
©
2007 Microchip Technology Inc.
DS21483D-page 1
TC9400/9401/9402
Functional Block Diagram
Integrator
Capacitor
Input
Voltage
RIN
IIN
Integrator
Op Amp
Threshold
Detector
One
Shot
Pulse Output
Reference
Capacitor
TC9400
IREF
÷
2
Pulse/2 Output
Reference
Voltage
DS21483D-page 2
©
2007 Microchip Technology Inc.
TC9400/9401/9402
1.0
ELECTRICAL
CHARACTERISTICS
†
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.
Absolute Maximum Ratings †
V
DD
– V
SS
......................................................................+18V
I
IN
..................................................................................10 mA
V
OUT
MAX
– V
OUT
Common.................................................23V
V
REF
– V
SS
.....................................................................-1.5V
Storage Temperature Range.........................-65°C to +150°C
Operating Temperature Range:
C Device ...................................................... 0°C to +70°C
E Device....................................................-40°C to +85°C
Package Dissipation (T
A
≤
70°C):
8-Pin CerDIP ........................................................800 mW
8-Pin Plastic DIP ..................................................730 mW
8-Pin SOIC ...........................................................470 mW
TC940X ELECTRICAL SPECIFICATIONS
Electrical Characteristics:
unless otherwise specified, V
DD
= +5V, V
SS
= -5V, V
GND
= 0V, V
REF
= -5V, R
BIAS
= 100 kΩ, Full Scale =
10 kHz. T
A
= +25°C, unless temperature range is specified (-40°C to +85°C for E device, 0°C to +70°C for C device).
Parameter
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Units
Test Conditions
Voltage-to-Frequency
Accuracy
Linearity 10 kHz
—
TC9400
0.01
0.05
—
TC9401
0.004
0.01
—
TC9402
0.05
0.25
%
Output Deviation from
Full Scale Straight Line Between
Normalized Zero and
Full Scale Input
%
Output Deviation from
Full Scale Straight Line Between
Normalized Zero Read-
ing and Full Scale Input
ppm/°C Variation in Gain A due
Full Scale to Temperature Change
% of
Nominal
mV
Variation from Ideal
Accuracy
Correction at Zero
Adjust for Zero Output
when Input is Zero
Variation in Zero Offset
Due to Temperature
Change
Linearity 100 kHz
—
0.1
0.25
—
0.04
0.08
—
0.25
0.5
Gain Temperature
Drift
(Note 1)
Gain Variance
Zero Offset
(Note 2)
Zero Temperature
Drift
(Note 1)
Note 1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
—
—
—
±25
±10
±10
±40
—
±50
—
—
—
±25
±10
±10
±40
—
±50
—
—
—
±50
±10
±20
±100
—
±100
—
±25
±50
—
±25
±50
—
±50
±100
µV/°C
Full temperature range; not tested.
I
IN
= 0.
Full temperature range, I
OUT
= 10 mA.
I
OUT
= 10 µA.
Threshold Detect = 5V, Amp Out = 0V, full temperature range.
10 Hz to 100 kHz; not tested.
5 µs minimum positive pulse width and 0.5 µs minimum negative pulse width.
t
R
= t
F
= 20 ns.
R
L
≥
2 kΩ, tested @ 10 kΩ.
Full temperature range, V
IN
= -0.1V.
©
2007 Microchip Technology Inc.
DS21483D-page 3
TC9400/9401/9402
TC940X ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics:
unless otherwise specified, V
DD
= +5V, V
SS
= -5V, V
GND
= 0V, V
REF
= -5V, R
BIAS
= 100 kΩ, Full Scale =
10 kHz. T
A
= +25°C, unless temperature range is specified (-40°C to +85°C for E device, 0°C to +70°C for C device).
Parameter
Analog Input
I
IN
Full Scale
—
10
—
—
10
—
—
10
—
µA
Full Scale Analog Input
Current to achieve
Specified Accuracy
Over Range Current
Settling Time to 0.1%
Full Scale
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Units
Test Conditions
I
IN
Over Range
Response Time
Digital Section
V
SAT
@ I
OL
= 10mA
V
OUT
MAX
– V
OUT
Common
(Note 4)
Pulse Frequency
Output Width
—
—
—
2
TC9400
50
—
—
—
—
2
TC9401
50
—
—
—
—
2
TC9402
50
—
µA
Cycle
—
—
—
0.2
—
3
0.4
18
—
—
—
—
0.2
—
3
0.4
18
—
—
—
—
0.2
—
3
0.4
18
—
V
V
µs
Logic “0” Output
Voltage
(Note 3)
Voltage Range Between
Output and Common
Frequency-to-Voltage
Supply Current
I
DD
Quiescent
(Note 5)
I
SS
Quiescent
(Note 5)
V
DD
Supply
V
SS
Supply
Reference Voltage
V
REF
– V
SS
Accuracy
Non-Linearity
(Note 10)
—
0.02
0.05
—
0.01
0.02
—
0.05
0.25
%
Deviation from ideal
Full Scale Transfer Function as a
Percentage Full Scale
Voltage
Hz
Frequency Range for
Specified Non-Linearity
-2.5
—
—
-2.5
—
—
-2.5
—
—
V
Range of Voltage
Reference Input
—
1.5
6
—
1.5
6
—
3
10
mA
Current Required from
Positive Supply during
Operation
Current Required from
Negative Supply during
Operation
Operating Range of
Positive Supply
Operating Range of
Negative Supply
—
-1.5
-6
—
-1.5
-6
—
-3
-10
mA
4
-4
—
—
7.5
-7.5
4
-4
—
—
7.5
-7.5
4
-4
—
—
7.5
-7.5
V
V
Input Frequency
Range
(Notes 7 and 8)
Note 1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
10
—
100k
10
—
100k
10
—
100k
Full temperature range; not tested.
I
IN
= 0.
Full temperature range, I
OUT
= 10 mA.
I
OUT
= 10 µA.
Threshold Detect = 5V, Amp Out = 0V, full temperature range.
10 Hz to 100 kHz; not tested.
5 µs minimum positive pulse width and 0.5 µs minimum negative pulse width.
t
R
= t
F
= 20 ns.
R
L
≥
2 kΩ, tested @ 10 kΩ.
Full temperature range, V
IN
= -0.1V.
DS21483D-page 4
©
2007 Microchip Technology Inc.
TC9400/9401/9402
TC940X ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics:
unless otherwise specified, V
DD
= +5V, V
SS
= -5V, V
GND
= 0V, V
REF
= -5V, R
BIAS
= 100 kΩ, Full Scale =
10 kHz. T
A
= +25°C, unless temperature range is specified (-40°C to +85°C for E device, 0°C to +70°C for C device).
Parameter
Frequency Input
Positive Excursion
0.4
—
V
DD
0.4
—
V
DD
0.4
—
V
DD
V
Voltage Required to
Turn Threshold
Detector On
Voltage Required to
Turn Threshold
Detector Off
Time between
Threshold Crossings
Time Between
Threshold Crossings
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Units
Test Conditions
Negative Excursion
-0.4
-2
-0.4
—
-2
-0.4
—
-2
V
Minimum Positive
Pulse Width
(Note 8)
Minimum Negative
Pulse Width
(Note 8)
Input Impedance
Analog Outputs
Output Voltage
(Note 9)
Output Loading
Supply Current
I
DD
Quiescent
(Note 10)
I
SS
Quiescent
(Note 10)
V
DD
Supply
V
SS
Supply
Reference Voltage
V
REF
– V
SS
Note 1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
—
5
—
—
5
—
—
5
—
μs
—
0.5
—
—
0.5
—
—
0.5
—
μs
—
10
TC9400
—
—
10
TC9401
—
—
TC9402
10
MΩ
—
V
DD
– 1
—
—
V
DD
– 1
—
—
V
DD
– 1
—
V
Voltage Range of Op
Amp Output for
Specified Non-Linearity
Resistive Loading at
Output of Op Amp
2
—
TC9400
—
2
—
TC9401
—
2
—
TC9402
—
kΩ
—
1.5
6
—
1.5
6
—
3
10
mA
Current Required from
Positive Supply During
Operation
Current Required from
Negative Supply During
Operation
Operating Range of
Positive Supply
Operating Range of
Negative Supply
—
-1.5
-6
-1.5
-6
—
-3
-10
mA
4
-4
—
—
7.5
-7.5
4
-4
—
—
7.5
-7.5
4
-4
—
—
7.5
-7.5
V
V
-2.5
—
—
-2.5
—
—
-2.5
—
—
V
Range of Voltage
Reference Input
Full temperature range; not tested.
I
IN
= 0.
Full temperature range, I
OUT
= 10 mA.
I
OUT
= 10 µA.
Threshold Detect = 5V, Amp Out = 0V, full temperature range.
10 Hz to 100 kHz; not tested.
5 µs minimum positive pulse width and 0.5 µs minimum negative pulse width.
t
R
= t
F
= 20 ns.
R
L
≥
2 kΩ, tested @ 10 kΩ.
Full temperature range, V
IN
= -0.1V.
©
2007 Microchip Technology Inc.
DS21483D-page 5
京公网安备 11010802033920号
EEWORLD
