74HCT9046A Datasheet, PDF (2/40 Pages) NXP Semiconductors – PLL with bandgap controlled VCO

Philips Semiconductors
PLL with bandgap controlled VCO
Product specification
74HCT9046A
FEATURES
• Low power consumption
• Centre frequency up to
17 MHz (typ.) at V_CC = 5.5 V
• Choice of two phase
comparators⁽¹⁾:
– EXCLUSIVE-OR (PC1)
– Edge-triggered JK flip-flop (PC2)
• No dead zone of PC2
• Charge pump output on PC2,
whose current is set by an external
resistor R_b
• Centre frequency tolerance ±10%
• Excellent
voltage-controlled-oscillator (VCO)
linearity
• Low frequency drift with supply
voltage and temperature variations
• On chip bandgap reference
• Glitch free operation of VCO, even
at very low frequencies
• Inhibit control for ON/OFF keying
and for low standby power
consumption
• Operation power supply voltage
range 4.5 to 5.5 V
• Zero voltage offset due to op-amp
buffering
• Output capability: standard
• I_CC category: MSI.
APPLICATIONS
• FM modulation and demodulation
where a small centre frequency
tolerance is essential
• Frequency synthesis and
multiplication where a low jitter is
required (e.g. Video
picture-in-picture)
• Frequency discrimination
• Tone decoding
• Data synchronization and
conditioning
• Voltage-to-frequency conversion
• Motor-speed control.
GENERAL DESCRIPTION
The 74HCT9046A is a high-speed
Si-gate CMOS device. It is specified
in compliance with “JEDEC standard
no. 7A”.
QUICK REFERENCE DATA
GND = 0 V; T_amb = 25 °C; t_r = t_f ≤ 6 ns.
SYMBOL
PARAMETER
CONDITIONS TYP.
f_c
VCO centre frequency C1 = 40 pF;
16
R1 = 3 kΩ;
V_CC = 5 V
C_I
input capacitance
3.5
C_PD
power dissipation
notes 1 and 2 20
capacitance per
package
UNIT
MHz
pF
pF
Notes
1. C_PD is used to determine the dynamic power dissipation (P_D in µW)
a) P_D = C_PD × V_CC2 × f_i + Σ(C_L × V_CC2 × f_o) where:
b) f_i = input frequency in MHz; C_L = output load capacity in pF;
f_o = output frequency in MHz; V_CC = supply voltage in V;
Σ(C_L × V_CC2 × f_o) = sum of the outputs.
2. Applies to the phase comparator section only (inhibit = HIGH). For power
dissipation of the VCO and demodulator sections see Figs 26 to 28.
ORDERING INFORMATION
EXTENDED
TYPE NUMBER
74HCT9046AN
74HCT9046AD
PINS
16
16
PACKAGE
PIN POSITION
DIL16
SO16
MATERIAL
plastic
plastic
CODE
SOT38Z
SOT109A
(1) R_b connected between pin 15 and
ground: PC2 mode, with PCP_OUT at
pin 2.
Pin 15 left open or connected to V_CC:
PC1 mode with PC1_OUT at pin 2.
1999 Jan 11
2