參數(shù)資料
型號(hào)： TLC2933PW
廠商： Texas Instruments, Inc.
英文描述： HIGH-PERFORMANCE PHASE-LOCKED LOOP
中文描述： 高性能鎖相環(huán)
文件頁(yè)數(shù)： 2/21頁(yè)
文件大?。?/td> 367K
代理商： TLC2933PW
TLC2933
HIGH-PERFORMANCE PHASE-LOCKED LOOP
SLAS136A – APRIL 1996 – REVISED JUNE 1997
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.
13
BIAS
I
Bias supply. An external resistor (RBIAS) between VCO VDD and BIAS supplies bias for adjusting the
oscillation frequency range.
FIN–A
4
I
Input reference frequency f(REF IN) is applied to FIN–A.
Input for VCO external counter output frequency f(FIN–B). FIN–B is nominally provided from the external
counter.
FIN–B
5
I
LOGIC GND
7
Ground for the internal logic.
LOGIC VDD
1
Power supply for the internal logic. This power supply should be separate from VCO VDD to reduce
cross-coupling between supplies.
NC
8
No internal connection.
PFD INHIBIT
9
I
PFD inhibit control. When PFD INHIBIT is high, PFD OUT is in the high-impedance state, see Table 2.
PFD OUT
6
O
PFD output. When the PFD INHIBIT is high, PFD OUT is in the high-impedance state.
TEST
2
I
Test terminal. TEST connects to ground for normal operation.
VCO GND
11
Ground for VCO.
VCO IN
12
I
VCO control voltage input. Nominally the external loop filter output connects to VCO IN to control VCO
oscillation frequency.
VCO INHIBIT
10
I
VCO inhibit control. When VCO INHIBIT is high, VCO OUT is low (see Table 1).
VCO OUT
3
O
VCO output. When VCO INHIBIT is high, VCO OUT is low.
VCO VDD
14
Power supply for VCO. This power supply should be separated from LOGIC VDD to reduce cross-coupling
between supplies.
detailed description
VCO oscillation frequency
The VCO oscillation frequency is determined by an external resistor (R
BIAS
) connected between the VCO V
DD
and the BIAS terminals. The oscillation frequency and range depends on this resistor value. While all resistor
values within the specified range result in excellent low temperature coefficients, the bias resistor value for the
minimum temperature coefficient is nominally 2.2 k
with 3-V V
DD
and nominally 2.4 k
with 5-V V
DD
. For the
lock frequency range refer to the recommended operating conditions. Figure 1 shows the typical frequency
variation and VCO control voltage.
VCO Oscillation Frequency Range
Bias Resistor (RBIAS)
1/2 VDD
VCO Control Voltage (VCO IN)
V
o
Figure 1. VCO Oscillation Frequency
相關(guān)PDF資料
PDF描述
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