LTC1064 데이터 시트보기 (PDF) - Linear Technology
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LTC1064 Datasheet PDF : 20 Pages
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LTC1064
PIN FUNCTIONS
V +, V – (Pins 7, 19): Power Supplies. They should be
bypassed with a 0.1µF ceramic capacitor. Low noise,
nonswitching power supplies are recommended. The de-
vice operates with a single 5V supply and with dual
supplies. The absolute maximum operating power supply
voltage is ±8V.
CLK (Pin 18): Clock. For ±5V supplies the logic threshold
level is 1.4V. For ±8V and 0V to 5V supplies the logic
threshold levels are 2.2V and 3V respectively. The logic
threshold levels vary ±100mV over the full military tem-
perature range. The recommended duty cycle of the input
clock is 50%, although for clock frequencies below 500kHz,
the clock “on” time can be as low as 200ns. The maximum
clock frequency for ±5V supplies is 4MHz. For ±7V
supplies and above, the maximum clock frequency is
7MHz.
AGND (Pin 6): Analog Ground. When the LTC1064 oper-
ates with dual supplies, Pin 6 should be tied to system
ground. When the LTC1064 operates with a single positive
supply, the analog ground pin should be tied to 1/2 supply
and it should be bypassed with a 1µF solid tantalum in
parallel with a 0.1µF ceramic capacitor, Figure 1. The
positive input of all the internal op amps, as well as the
common reference of all the internal switches, are inter-
nally tied to the analog ground pin. Because of this, a very
“clean” ground is recommended.
50/100 (Pin 17): By tying Pin 17 to V +, all filter sections
operate with a clock-to-center frequency ratio internally
set at 50:1. When Pin 17 is at mid-supplies, sections B and
C operate with (fCLK /fO) = 50:1 and sections A and D
operate at 100:1. When Pin 17 is shorted to the negative
supply pin, all filter sections operate with (fCLK/fO) =
100:1.
V+
5k
+
1µF
5k
ANALOG
GROUND
PLANE
V+/2
0.1µF
1
24
2
23
3
LTC1064
22
4
21
5
20
6 AGND
7 V+
8
9
V– 19
18
CLK
17
50/100
16
10
15
11
14
12
13
NOTE: PINS 5, 8, 20, IF NOT USED, SHOULD BE CONNECTED TO PIN 6
CLOCK INPUT
V+ = 15V, TRIP VOLTAGE = 7V
V+ = 10V, TRIP VOLTAGE = 6.4V
V+ = 5V, TRIP VOLTAGE = 3V
TO DIGITAL
GROUND
1064 F01
Figure 1. Single Supply Operation
1064fb
6
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