LTC1164-8(RevA) 查看數據表（PDF） - Linear Technology

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LTC1164-8
(Rev.:RevA)

Ultraselective, Low Power 8th Order Elliptic Bandpass Filter with Adjustable Gain

Linear Technology 

LTC1164-8

PIN FUNCTIONS

AGND (Pins 3, 5): Analog Ground Pins. For dual supply

operation, Pins 3 and 5 (AGND) are connected to an

analog ground plane. For single supply operation, Pins 3

and 5 should be biased at 1/2 of the V + supply and be

bypassed to the analog ground plane with a 1µF (tanta-

lum or better) capacitor (Figure 2). For optimum gain

linearity and single 5V supply operation, the analog

ground Pins 3 and 5 should be biased at 2V. Under these

conditions the typical output AC swing is 0.5V to 3.5V

(please refer to the THD + Noise vs Input Voltage graph).

The filter performance depends on the quality of the

analog ground. For either a dual or a single supply

operation, an analog ground plane surrounding the pack-

age is necessary. The analog ground plane for the filter

should be connected to any digital ground plane at a

single point.

INVB, INVA, IOUT, [R (h, l]) (Pins 2, 7, 9, 14): External

Connection Pins. Pin 2 (INVB) is the inverting input on an

op amp. Pin 9 (IOUT) is the junction of two internal

resistors. Pin 7 (INVA) is the inverting input of an op amp,

Pin 14 [R (h, l)] is the junction of two internal resistors.

For normal filter operation an external input resistor (RIN)

should be connected to input Pin 2 and the output Pin 9

should be connected to the inverting input of an external

op amp with a feedback resistor (RF). Also Pins 7 and 14

should be connected together (Figures 1 and 2). On a

printed circuit board the external connections should be

less than one inch and surrounded by a ground plane.

The input resistor and output op amp with feedback

resistor determine the filter’s gain and dynamic range.

Please refer to the Applications Information section for

more information.

NC (1, 6, 8, 10, 13): NC Pins. Pins 1, 6, 8, 10 and 13 are

not connected to any circuit point on the device and

should be tied to analog ground for dual or single supply

operation.

TEST CIRCUIT

VS

1N4148

RIN

340k

VIN

0.1µF

1

14

2

13

3

12

4 LTC1164-8 11

5

10

6

9

7

8

0.1µF

–VS

1N4148

fCLK

100kHz

100pF

61.9k

15V

2–

7

LT1220

3+

4

–15V

0.1µF

6

VOUT

0.1µF

LTC1164-8 • TC

6

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