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TA7715P
FREQUENCY TO VOLTAGE CONVERTER
TOSHIBA TA7715P
TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC
TA77115P
FREQUENCY TO VOLTAGE CONVERTER
The TA7715P is a general purpose F-V converter designed
for FDD, VTR, ATR and player F-servo system use.
It contains High Gain Input Amplifier, Hysteresis Amplifier
(for wave form shapping), and Sample-and-Hold type F-V
conversion amplifier.
DlP16-P-200-2.5dA
Weight : 1.119 (Typ.)
BLOCK DIAGRAM
FGOUT SH 9
- + 13 - VOUT
FGlN FG AMP SCHMITT S/H 11
\JFG f +
PHASE SIGNAL INPUT 10 F/V OUT
(FOR PLL USE ONLY)
I VIN -
- COUNT DOWN CCh
Ca PHASE CONT Vrefl ~19
-fi) Vref2 3/
RP BE Ct Rt Co ch GND Vref2
“i”? (i) 16
961001 EBA2
O TOSHIBA is continually working to improve the quality and the reliability of its products. Nevertheless, semiconductor devices in general can
malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibilit of the buyer, when utilizing
TOSHIBA products, to observe standards of safety, and to avoid situations in which a malfunction or failure of a TO HIBA product could cause loss
of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified
operating ranges as set forth in the most recent products specifications. Also, please keep in mind tho precautions and conditions set forth in tho
TOSHIBA Semiconductor Reliability Handbook.
0 The products described in this document are subject to foreign exchange and foreign trade control laws.
0 The information contained herein is presented only as a guide for the ap Iications of our products. No responsibility is assumed by TOSHIBA
CORPORATION for any infringements of intellectual property or other rights o the third parties which may result from its use. No license is granted
b implication or otherwise under any intellectual property or other rights of TOSHIBA CORPORATION or others.
tt T e information contained herein is subject to change without notice.
1997-07-01 1/8
TOSHIBA TA7715P
PIN FUNCTION
PIN No. SYMBOL FUNCTIONAL DESCRIPTION
1 Co Capacitor connection terminal for setting time constans (for F/V Amp.)
2 SH Schmitt Amp. output terminal
Capacitor connection terminal forgetting time constants (for F/V buffer
3 CHf Amp.)
4 Ct Capacitor connection terminal for setting time constants
5 RP Phase control signal output terminal
6 Rt Resistor connection terminal for setting time constants
7 Vref2 Internal reference voltage output terminal
8 SP Phase control signal input terminal
9 VCC Power supply input terminal
10 VIN Buffer Amp. negative input terminal
11 VOUT Buffer Amp. output terminal
12 Vref1 F/V Amp. reference voltage output terminal
13 FGIN FG Amp. negative-side input terminal
14 FGOUT FG Amp. output terminal
15 FGref FG Amp. positive-side input terminal
16 GND GND terminal
OPERATION
TA7715P outputs control signals (F/V conversion output) generated by the sample and hold (S/H)
circuit for each cycle of the frequency signal output.
Consequently, TA7715P offers a superior response to methods counting the monostable
multivibrator cycles or the input signal cycles to drive a D/A converter and output a latched result.
Fig.1 shows the input FG amp circuit, which amplifies the weak FG signal.
The Schmitt circuit in the next stage has the required hysteresis for wave-shaping and generates
the signals needed for S/H.
S/H operations are based on the waveform-shaped FG output from the SH terminal (pin®). That
is, the time constant capacitor Ct (pin@) is momentarily charged to the internal reference voltage
10-VBE when the SH pulse (pin®) falls.
The hold pulse and reset pulse required for the S/H operation are generated by the voltage of this
capacitor. The hold pulse is output until the voltage falls to 9A/BE. The reset pulse is output while
the voltage is falling between 9AIBE and SA/BE.
The voltage of the Ct is discharged by the constant current (Ioz), which is determined by resistor Rt
connected to the Rt terminal (pin(B)).
The S/H operation is based on the hold and reset pulses generated by the changes in the Ct
voltage.
First, capacitor Co, which is connected to the Co terminal (pinCD), is momentarily charged to 10A/BE
by the reset pulse and discharged by the constant current (log), which is determined by Rt. F/V
conversion is performed by designating the discharge time as the time from the reset pulse fall to
the hold pulse rise.
1997-07-01 2/8
TOSHIBA TA7715P
In other words, the F/V conversion output is performed by retaining the Co terminal output with
the hold pulse. (Fig.3)
The Co output is transferred to CHf in the circuit and output through the buffer amp. The buffer
amp output (VOUT pin, pinO)) changes to 1'3'VBE with 7A/BE as the center, that is, within the
range of 4A/BE--10A/BE, according to the input frequency. Thus, the F/V conversion output is
obtained by the output differential with the potential of the Vrefl terminal (pin®), which has a
reference voltage of TN/BE.
In addition, the conversion output can be amplified by the buffer amp using direct current. The
gain in the Fig.2 example is a multiple of ((Ra+Rb)/Rb).
Although unlike Co, Ct, and Rt, the CHf value does not need to be precise, too large a value
causes deterioration in response characteristics.
Too small a value causes F/V conversion error due to leakage.
If the FG frequency is in the range of 500-1kHz, use the values indicated in the application circuits.
E x I co VCC
Limiter
Di d N
IO e OUTPUT
(for Hysteresis Amp.)
F- Vref
L (Note) (Note)
1: '2 V -iV l V '-.4 7V
_ re'f-9 CC+ 3 BE-.9.
(at VCC = 10V)
s? '01 9 I02
Fig.1 FG Amp.
F/V AMP. Buffer Amp.
Ct Charge Path
CE Rb"
Control C) '
Circuit Ci))
log g (Co 1 l ? o i 05
(Ct discharge Path) discharge Path) C At "ON", the C
lct The values of '02 and IO? l o fo potential Hf The DC gain of the buffer Amp is
are determined by the Rt IS transferred R Rh
to CHf L
Fig.2 S/H, buffer Amp.
1997-07-01 3/8
TOSHIBA TA7715P
FGOUT (pin®) _/ :3‘VB \ / N / N /
SH (pin@) i I I I I I I
10-VBE 9 V
Ct (pin@)
HOLD PULSE I I g I I
,4: l_l
"WEE \E f=High
RESET PULSE
Co (pinCO)
(and Transfer to Chf)
f=Middle
Fig.3 Timing chart
MAXIMUM RATINGS (Ta = 25°C)
CHARACTERISTIC SYMBOL RATING UNIT
Supply Voltage VCC 15 V
Power Dissipation (Note) PD 750 mW
Operating Temperature Top, - 25-75 "C
Storage Temperature Tstg - 55--150 ''C
(Note) Derated above Ta=25°C in the proportion of 6mW/°C.
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, VCC=10V, Ta = 25°C)
CHARACTERISTIC SYMBOL CIR- TEST CONDITION MIN. TYP. MAX. UNIT
Operating Voltage Range VCC(opr) - ei=2m1/rms, f=726Hz 9 10 12 V
Supply Current ICC 2.5 - 10 mA
Input Sensing Voltage VIN - f=726Hz 0.35 - 2.5 mVrms
Vref1 4.0 5.0 6.0
Reference Voltage Vref2 1.5 2.0 2.5 V
- ei =2mVrms, f=726HZ -
F/V Converter Output Voltage VOUT Rf=27.6kQ 0.5 0 0.5 V
F/V Converter Out ut Noise
Voltage p VNF - ei =2mVrms, f=726HZ - - 5 mi/rms
VFH ei =2mVrms. f=900 i10Hz 2.5 - -
Max. Output Voltage VFL - ei = 2mVrms, f= 580 i10Hz - - - 2.2
RP Saturation Voltage VRirtsaty - RL=100kQ - - 0.3
1997-07-01 4/8
TOSHIBA TA7715P
TEST CIRCUIT
SG- 56+ b b
220m o- o-ON/cc
t I C LL a
Ps a + Q,
st + I O
o I '- O
- ' - GND
u. I q“,
tt, IOOOpF m
100%) 39km 56kQ
16 15 14 G?) a
GND FGref FGOUT FGIN Vref1 VOUT VIN VCC sw
TA7715P u D
SH ch Ct RP Rt Vref2 SP (omnl- (OFF)
b ce Vref2 SP "
28.05k0
RL 1q0k0
(*) t 1% ACCURACY IS REQUIRED
MEASURING METHOD
Operating voltage range
F/V conversion must be performed when VCC is set between 9--12V with ei =2mVrms and
f=726Hz. At this time, SWA is set to a, SWC to OFF, SWD to OFF, and SWE to a.
Power supply current
In state (1), read power supply current.
Input operating voltage
In state (1), read the input level when the input level is gradually increased and the SH terminal
is in operating mode (confirm square wave output of f=726Hz with amplitude of about 3V).
Reference voltage 1
In state (1), read the DC voltage of Vref1 terminal.
Reference voltage 2
In state (1), read the DC voltage of Vref2 terminal.
F/V conversion output voltage
In state (1), read the voltage between terminal Vref1-VOUT. Set Rt=27.6k(2.
F/V conversion output noise voltage
In state (1), read the AC voltage of pin®.
Maximum output voltage
In state (1), set the input frequency to the specified value and read the voltage between
terminal vref1-VOUT.
RP saturation voltage
In state (8), set the SP terminal to "OPEN" and read the DC voltage when the RP terminal is set
to " N".
Load resistor RL should have the specified value and be connected directly to the VCC terminal. If the
RP terminal is "OFF", set the SWD to "ON" and measure the RP saturation voltage.
1997-07-01 5/8
TOSHIBA TA7715P
Rt = 27.6k0 vcc=1ov
Ct=8200pF
Co=2700pF
Ta=25°C
fi' fi
I'5 Vcc=9, 10, 12V 15
560 600 640 680 fo fi! 800 840 560 600 640 680 720 760 800 840
INPUT FREQUENCY f (Hz) INPUT FREQUENCY f (Hz)
FG AMP - Gvo VIN - Ta
Q v Vcc=15V
L” LLI
's ct,
fh INPUT OUTPUT a.
D - + _ E
0 0.47m
200 400 600 800 1000 1200 1400 1600 -40 -20 0 20 40 60 80 100
FG INPUT FREQUENCY (Hz) AMBIENT TEMPERATURE Ta (°C)
Vref - Ta
Vref1 Vcc--9, 12V
Vret2 VCC = 9, 12V
REFERENCE VOLTAGE Vref (V)
- 40 - 20 0 20 40 60 80 100
AMBIENT TEMPERATURE Ta CC)
1997-07-01 6/8
TOSHIBA TA7715P
APPLICATION CIRCUIT 1
3300 47#F
F/V OUT
TS Vcc--10V
12 Mo 11 Go 9 I
(*) Note 3
2700pF E
0.027yF w
OOpF E
27 6k§2
(Note 1) Connect if required.
(Note 2) CHf value is depend on Input Frequency and internal Bias Current (Base current).
Recommended value is 0.027pF at Input Frequency range of 300 to 1kHz.
(Note 3) Center Frequency and Jump Up Frequency are calculated by following equations.
f0 Rt (5-ct+3-co) ( z)
5-c +3-c
f3 = 0.187 %'f0 (Hz)
(Note 4) Recommended to use low leakage capacitance for CHf, Co, Ct.
APPLICATION CIRCUIT 2
‘W‘j’W i
TB_ VCC
$65656) "65636511 d 9 don" o
TA7715P TA7260P 1
cs) 6 C9 Q) 1 <2) l? C? s.) s.) Ir.)
Rt 3 J
t tvi)) + Jt% +
E; i: iti (1 /2W) LI;
1997-07-01 7/8
TOSHIBA TA7715P
OUTLINE DRAWING
DIP16-P-300-2.54A Unit : mm
T"-1r'_r-lr'-nl-1l-lr--qr-n
V''"-'''''-'?)
6.4102 _
V 19.75MAX u
19.25i0.2 -pa,
N k fi!
33 til
__2'_ E
z A x cn.
G. i, 'il
0.735TYP
Weight : 1.11g (Typ.)
1997-07-01 8/8
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