HEF4750V データシートの表示（PDF） - Philips Electronics
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HEF4750V Datasheet PDF : 17 Pages
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Philips Semiconductors
Frequency synthesizer
Product specification
HEF4750V
LSI
Notes
1. Definitions:
RA = external biasing resistor between pins TRA and VSS; 68 kΩ ± 30%.
CA = external timing capacitor for time/voltage converter, between pins TCA and VSS.
CB = external timing capacitor for phase modulator, between pins TCB and VSS.
CC = external hold capacitor between pins TCC and VSS.
CD = decoupling capacitor between pins TRA and VDD.
Logic inputs: V, R, STB, A0 to A9, NS0, NS1, OSC.
Logic outputs: OL, PC2, XTAL, OUT.
Analogue signals: TCA, TCB, TCC, TRA, PC1, MOD.
2. TRA at VDD; TCA, TCB, TCC and MOD at VSS; logic inputs at VSS or VDD.
3. All logic inputs at VSS or VDD.
4. RA connected; its value chosen such that ITRA = 100 µA.
5. The analogue switch is in the ON position (see Fig.9).
6. The analogue switch is in the ON position (see Fig.10).
7. See Fig.11.
This guarantees the d.c. voltage gain, combined with d.c.-offset.
Input condition: 0,3 VDD ≤ VTCA ≤ 0,7 VDD.
∆V = VTCC−VTCA.
8. See Fig.12.
9. See Fig.13.
10. See Fig.14.
This guarantees the d.c. voltage gain, combined with d.c.-offset.
Input condition: 0,3 VDD ≤ VTCC ≤ 0,7 VDD.
∆V = VPC1−VTCC.
11. Switching level at TCA, generating an EOR-signal, during increasing input voltage.
12. See Fig.15.
13. See Fig.16.
Definition of the ramp linearity at full swing.
14. The external components and modulation input voltage must be chosen such that this requirement will be fulfilled, to
ensure that CA is sufficiently discharged during that time.
15. See Fig.17.
Circuit connections for power supply current specification, with speed-up 1 : 10. V and R are in the range of PC1,
such that the output voltage at PC1 is equal to 5 V.
fOSC = 5 MHz (external clock)
fSTB = 12,5 kHz
fV = 125 kHz
16. See Fig.18.
Circuit connections for power supply current specification, without speed-up. V and R are in the range of PC1, such
that the output voltage at PC1 is equal to 5 V.
fOSC = 5 MHz (external clock)
fSTB = 12,5 kHz
fV = 12,5 kHz
January 1995
12
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