参数资料
型号: TLC2932IPW
厂商: TEXAS INSTRUMENTS INC
元件分类: PLL合成/DDS/VCOs
英文描述: PHASE LOCKED LOOP, 40 MHz, PDSO14
封装: PLASTIC, TSSOP-14
文件页数: 12/28页
文件大小: 665K
代理商: TLC2932IPW
TLC2932
HIGH-PERFORMANCE PHASE-LOCKED LOOP
SLAS097E – SEPTEMBER 1994 – REVISED MAY 1997
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
FIN – A
4
I
Input reference frequency f(REF IN) is applied to FIN – A.
FIN – B
5
I
Input for VCO external counter output frequency f(FIN – B). FIN – B is nominally provided from the external
counter.
LOGIC GND
7
GND 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 output is in the high-impedance state, see Table 3.
PFD OUT
6
O
PFD output. When the PFD INHIBIT is high, PFD output is in the high-impedance state.
BIAS
13
I
Bias supply. An external resistor (RBIAS) between VCO VDD and BIAS supplies bias for adjusting the
oscillation frequency range.
SELECT
2
I
VCO output frequency select. When SELECT is high, the VCO output frequency is
×1/2 and when low, the
output frequency is
×1, see Table 1.
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 2).
VCO GND
11
GND for VCO.
VCO OUT
3
O
VCO output. When the VCO INHIBIT is high, VCO output 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 (RBIAS) connected between the VCO VDD
and the BIAS terminals. The oscillation frequency and range depends on this resistor value. The bias resistor
value for the minimum temperature coefficient is nominally 3.3 k
with 3-V at the VCO VDD terminal and
nominally 2.2 k
with 5-V at the VCO VDD terminal. 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)
VCO
Oscillation
Frequency
(f
)
osc
Figure 1. VCO Oscillation Frequency
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