LTC1069-7IS8 Linear Technology, LTC1069-7IS8 Datasheet - Page 6

• Manufacturer Part Number: LTC1069-7IS8
• Description: IC FILTR 8TH ORDER LOWPASS 8SOIC
• Manufacturer: Linear Technology

Specifications of LTC1069-7IS8

• Filter Type: Linear Phase, Lowpass Switched Capacitor
• Frequency - Cutoff Or Center: 200kHz
• Number Of Filters: 1
• Max-order: 8th
• Voltage - Supply: ±5 V, 5 V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC1069-7
TYPICAL PERFORMANCE CHARACTERISTICS
PIN FUNCTIONS
AGND (Pin 1): Analog Ground. The quality of the analog
signal ground can affect the fi lter performance. For either
single or dual supply operation, an analog ground plane
surrounding the package is recommended. The analog
ground plane should be connected to any digital ground
at a single point. For dual supply operation, Pin 1 should
be connected to the analog ground plane.
For single supply operation, Pin 1 should be bypassed
to the analog ground plane with a capacitor 0.47μF or
larger. An internal resistive divider biases Pin 1 to half the
total power supply. Pin 1 should be buffered if used to
bias other ICs. Figure 1 shows the connections for single
supply operation.
V
V
an adequate analog ground. The fi lter’s power supplies
should be isolated from other digital or high voltage analog
supplies. A low noise linear supply is recommended. Using
switching power supplies will lower the signal-to-noise
ratio of the fi lter. Unlike previous monolithic fi lters, the
power supplies can be applied in any order, that is, the
positive supply can be applied before the negative supply
and vice versa. Figure 2 shows the connections for dual
supply operation.
6
+
–
, V
–4.5
–4.6
–4.7
(Pin 7) should be bypassed with a 0.1μF capacitor to
4.0
4.2
4.1
–40
–
Output Voltage Swing
vs Temperature
(Pins 2, 7): Power Supplies. The V
–20
0
TEMPERATURE (°C)
20
V
f
f
R
I
40
CLK
CUTOFF
SOURCE
S
L
= ±5V
= 10k
= 2.5MHz
60
= 100kHz
/I
SINK
= 1mA
80
1069-7 G18
100
+
25
20
15
10
5
0
(Pin 2) and
0
Supply Current
vs Supply Voltage
f
CLK
= 10Hz
1
SUPPLY VOLTAGE (±V)
2
25°C
NC (Pins 3, 6): No Connection. Pins 3 and 6 are not
connected to any internal circuitry; they should be tied
to ground.
V
connected to the inverting inputs of two op amps through
a 36k resistor for each op amp. This parallel combination
creates an 18k input impedance.
3
IN
(Pin 4): Filter Input. The fi lter input pin is internally
4
85°C
ANALOG GROUND
PLANE
0.47μF
Figure 1. Connections for Single Supply Operation
–40°C
5
STAR
SYSTEM
GROUND
1069-7 G19
0.1μF
6
V
IN
V
+
1
2
3
4
22
21
20
19
18
17
16
15
14
13
12
11
10
AGND
V
NC
V
0.25
IN
+
Supply Current
vs Clock Frequency
LTC1069-7
GROUND
DIGITAL
PLANE
1.25
V
CLOCK FREQUENCY (MHz)
CLK
OUT
NC
V
–
SOURCE
2.25
8
7
6
5
CLOCK
V
V
OUT
S
1k
V
= 5V
S
= ±5V
3.25
1069-7 F01
4.25
1069-7 G20
10697fa
5.25