Sensitive 1 GHz divide-by-64/divide-by-256 switchable prescaler
Description
INTEGRATED CIRCUITS
DATA SHEET
SAB6456 SAB6456T Sensitive 1 GHz divide-by-64/divide-by-256 switchable prescaler
Product specification File under Integrated Circuits, IC02 June 1986
Philips Semiconductors
Product specification
Sensitive 1 GHz divide-by-64/divide-by-256 switchable prescaler
GENERAL DESCRIPTION
SAB6456 SAB6456T
The SAB6456/SAB6456T is a prescaler for UHF/VHF tuners.
It can be switched to divide-by-64 or divide-by-256 by the mode-control (MC) pin.
The circuit has an input frequency range of 70 MHz to 1 GHz, has high input sensitivity and good harmonic suppression.
Fig.
1 Block diagram.
QUICK REFERENCE DATA PARAMETER Supply voltage Supply current Input frequency range Sensitivity to input voltage (r.
m.
s.
value) Output voltage (peak-to-peak value) Operating ambient temperature range PACKAGE OUTLINES SAB6456 : 8-lead DIL; plastic (SOT97); SOT97-1; 1996 November 18.
SAB6456T: 8-lead mini-pack (SO8; SOT96A); SOT96-1; 1996 November 18.
Tamb 0 − 80 °C pins 6 and 7 Vo(p-p) − 1 − V Vi(rms) − − 10 mV CONDITIONS pin 8 to pin 4 pin 8 pins 2 and 3 SYMBOL VCC ICC fi − 70 MIN.
4,5 TYP.
5,0 21 − − 1000 MAX.
5,5 V mA MHz UNIT
June 1986
2
Philips Semiconductors
Product specification
Sensitive 1 GHz divide-by-64/divide-by-256 switchable prescaler
PINNING 1.
2.
3.
4.
5.
6.
7.
8.
Fig.
2 Pinning diagram.
n.
c.
C1 C2 VEE MC QH QL VCC not connected
SAB6456 SAB6456T
differential inputs ground (0 V) mode control complementary outputs positive supply voltage
FUNCTIONAL DESCRIPTION The circuit comprises an input amplifier, a divider stage with selectable division ratio and an output stage.
The input amplifier is driven by a sinusoidal signal from the local oscillator of a television tuner.
The inputs (C1, C2) are differential and are biased internally to permit capacitive coupling.
When driven asymmetrically the unused input should be connected to ground via a capacitor.
The mode-control (MC) input to the divider stage is intended for static control of the division rati...
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