LTC1067-50CS datasheet(7/20 Pages) AD

7 / 20 page

LTC1067/LTC1067-50

PIN FUNCTIONS

V+, V – (Pins 1, 3,14): The V + (Pins 1, 3) and the V – (Pin

14) should each be bypassed with a 0.1

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 recommended.

Using a switching power supply will lower the signal-to-

TYPICAL PERFORMANCE CHARACTERISTICS

LTC1067/LTC1067-50 Mode 1B

Noise Increase vs R5/R6 Ratio

LTC1067/LTC1067-50 Mode 3

Noise Increase vs R2/R4 Ratio

R2/R4 RATIO

0.2

2.0

1.9

1.8

1.7

1.6

1.5

1.4

1.3

1.2

1.1

1.0

0.5

0.7

1067 G26

0.3

0.4

0.6

0.8

0.9

1.0

noise ratio of the filter. The supply’s power-up slew rate

should be less than 1V/

µs.WhenV+isappliedbeforeV–, and

V – is allowed to go above ground, a diode should clamp V –

to prevent latch-up. Figures 1 and 2 show typical connec-

tions for dual and single supply operation.

0.1

µF

1067 F01

200

Ω

LTC1067

LTC1067-50

CLOCK

SOURCE

STAR

SYSTEM

GROUND

DIGITAL

GROUND

PLANE

V+

LPA

BPA

HPA/NA

INV A

CLK

AGND

V–

LPB

BPB

HPB/NB

INV B

V+

V –

0.1

µF

Figure 1. Dual Supply Ground Plane Connections

Figure 2. Single Supply Ground Plane Connections

0.1

µF

106 7 F02

200

Ω

LTC1067

LTC1067-50

CLOCK

SOURCE

STAR

SYSTEM

GROUND

DIGITAL

GROUND

PLANE

V+

LPA

BPA

HPA/NA

INV A

CLK

AGND

V–

LPB

BPB

HPB/NB

INV B

V+

µF

FOR MODE 3, THE SA AND SB SUMMING NODE PINS

ARE TIED TO THE AGND PIN

R5/R6 RATIO

2.0

1.9

1.8

1.7

1.6

1.5

1.4

1.3

1.2

1.1

1.0

1.5

2.5

1067 G25

0.5

1.0

2.0

3.0

3.5

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