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LTC1069-1C

Low Power, 8th Order Progressive Elliptic, Lowpass Filter

Linear Technology 

LTC1069-1

TYPICAL PERFORMANCE CHARACTERISTICS

Supply Current vs Supply Voltage

5

fCLK = 10Hz

4

3

25°C

85°C

2

–40°C

Supply Current vs Clock

Frequency

5.0

4.5

VS = ±5V

4.0

3.5

VS = 5V

3.0

1

0

0

1

2

3

4

5

6

TOTAL SUPPLY VOLTAGE (±V)

1069-1 G13

2.5

VS = 3.3V

2.0

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.2

CLOCK FREQUENCY (MHz)

1069-1 G14

Output Voltage Swing vs

Temperature

5

4

VS = ±5V

3

VS = ±2.5V

2

1

VS = ±1.57V

0

–1

VS = ±1.57V

–2

–3

VS = ±2.5V

–4

–5

–40

VS = ±5V

–20 0 20 40 60 80

AMBIENT TEMPERATURE (°C)

1069-1 G15

PIN FUNCTIONS

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.

0.47µF

V+

0.1µF

VIN

1 AGND VOUT 8

2 V+

V– 7

LTC1069-1

3 NC

NC 6

4 VIN

CLK 5

VOUT

ANALOG GROUND PLANE

STAR

SYSTEM

GROUND

DIGITAL

GROUND

PLANE

1k

CLOCK

SOURCE

1069-1 F01

Figure 1. Connections for Single Supply Operation

V+

0.1µF

1 AGND VOUT 8

2 V+

V– 7

LTC1069-1

3 NC

NC 6

VOUT

V–

0.1µF

VIN 4 VIN

CLK 5

ANALOG GROUND PLANE

STAR

SYSTEM

GROUND

DIGITAL

GROUND

PLANE

1k

CLOCK

SOURCE

1069-1 F02

Figure 2. Connections for Dual Supply Operation

5

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