5

LTC1069-1

TOTAL SUPPLY VOLTAGE (

±V)

0

1

2

34

1069-1 G13

5

5

4

3

2

1

0

6

–40

°C

25

°C

85

°C

AMBIENT TEMPERATURE (

°C)

–40

–20

0

20

40

60

80

5

4

3

2

1

0

–1

–2

–3

–4

–5

1069-1 G15

Output Voltage Swing vs

Temperature

CLOCK FREQUENCY (MHz)

0.1

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

Supply Current vs Supply Voltage

Supply Current vs Clock

Frequency

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 0.47

µF 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.

µF 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

NC

CLK

AGND

NC

0.1

µF

0.1

µF

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

NC

CLK

AGND

NC

0.1

µF

0.47

µF

1069-1 F01

1k

LTC1069-1

ANALOG GROUND PLANE

DIGITAL

GROUND

PLANE

STAR

SYSTEM

GROUND

CLOCK

SOURCE

Figure 1. Connections for Single Supply Operation

Figure 2. Connections for Dual Supply Operation