Datasheet

5
LTC1069-1
TOTAL SUPPLY VOLTAGE (±V)
0
SUPPLY CURRENT (mA)
1
2
34
1069-1 G13
5
5
4
3
2
1
0
6
–40°C
25°C
85°C
f
CLK
= 10Hz
AMBIENT TEMPERATURE (°C)
–40 –20 0 20 40 60 80
OUTPUT VOLTAGE SWING (V)
5
4
3
2
1
0
–1
–2
–3
–4
–5

1069-1 G15

V
S
= ±5V
V
S
= ±2.5V
V
S
= ±1.57V
V
S
= ±1.57V
V
S
= ±2.5V
V
S
= ±5V
Output Voltage Swing vs
Temperature
CLOCK FREQUENCY (MHz)
0.1
SUPPLY CURRENT (mA)
5.0
4.5
4.0
3.5
3.0
2.5
2.0

0.2
0.6
0.8
1069-1 G14
0.5
1.0
1.2
0.3
0.4
0.7 0.9
V
S
= 3.3V
V
S
= ±5V
V
S
= 5V
Supply Current vs Supply Voltage
Supply Current vs Clock
Frequency
PIN FUNCTIONS
UUU
AGND (Pin 1): Analog Ground. The quality of the analog
signal ground can affect the filter 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 0.47µF or larger capacitor. An
internal resistive divider biases Pin 1 to 1/2 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
–
(Pins 2, 7): Power Supply Pins. The V
+
(Pin 2) and
the V
–
(Pin 7) should be bypassed with a 0.1µF capacitor
to an adequate analog ground. The filter’s power supplies
should be isolated from other digital or high voltage
analog supplies. A low noise linear supply is recom-
mended. Using switching power supplies will lower the
signal-to-noise ratio of the filter. Unlike previous mono-
lithic filters, the power supplies can be applied at any
order, that is, the positive supply can be applied before the
negative supply and vice versa. Figure 2 shows the con-
nection for dual supply operation.
1
2
3
4
8
7
6
5
V
OUT

V
–

NC
CLK
AGND
V
+

NC
V
IN
V
+
V
–
0.1µF 0.1µF
V
IN


V
OUT
1k
LTC1069-1
ANALOG GROUND PLANE
DIGITAL
GROUND
PLANE
STAR
SYSTEM
GROUND
CLOCK
SOURCE
1069-1 F02
1
2
3
4
8
7
6
5
V
OUT

V
–

NC
CLK
AGND
V
+

NC
V
IN
V
+
0.1µF
0.47µF
V
IN


1069-1 F01
V
OUT
1k
LTC1069-1
ANALOG GROUND PLANE
DIGITAL
GROUND
PLANE
STAR
SYSTEM
GROUND
CLOCK
SOURCE
TYPICAL PERFORMANCE CHARACTERISTICS
UW
Figure 1. Connections for Single Supply Operation
Figure 2. Connections for Dual Supply Operation