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LTC1066-1

15pF capacitor should be connected between pins 11 and

13. Compensation is recommended for the following

cases shown in Table 6.

Table 6. Cases Where an RC Compensation (15pF in Series with

30k

Ω pins 11, 13) is Recommended, fCLK/fCUTOFF = 50:1

VS = Single 5V (AGND = 2V)

TA = 25°CfCUTOFF ≥ 28kHz

TA = 70°CfCUTOFF ≥ 24kHz

VS = ±5V

TA = 25°CfCUTOFF ≥ 60kHz

TA = 70°CfCUTOFF ≥ 50kHz

VS = ±7.5V

TA = 25°CfCUTOFF ≥ 70kHz

TA = 70°CfCUTOFF ≥ 60kHz

Connect Pins (6, 12)

Pin 6 (CONNECT 1) and pin 12 (CONNECT 2) should be

shorted. In a printed circuit board the connection should

be done under the IC package through a short trace

surrounded by the analog ground plane. Pin 6 should be

0.2 inches away from any other circuit trace.

PIN FUNCTIONS

(see Block Diagram). Input bias current flows out of pins

2 and 3. Pin 16 (+IN B) is the positive input of a high

performance op amp B which is internally connected as

a unity-gain follower. Op amp B buffers the switched-

capacitor network output. The input capacitance of both

op amps is 10pF.

Pin 14 (FILTERIN) is the input of a switched-capacitor

network. The input impedance of pin 14 is typically 11k.

Output Pins (1, 7, 17)

Pins 1 and 17 are the outputs of the internal high perfor-

mance op amps A and B. Pin 1 is usually connected to the

internal switched-capacitor filter network input pin 14. Pin

17 is the buffered output of the filter and it can drive loads

as heavy as 200

Ω (see THD + Noise curves under Typical

Performance Characteristics). Pin 7 is the internal switched-

capacitor network output and it can typically sink or

source 1mA.

Compensation Pins (11, 13)

Pins 11 and 13 are the AC compensation pins. If compen-

sation is needed, an external 30k resistor in series with a

BLOCK DIAGRAM

FILTERIN

CONNECT 1

COMP1

COMP2

CONNECT 2

FILTEROUT

8TH ORDER

SWITCHED-

CAPACITOR

NETWORK

5,18

4,10

–IN A

+IN A

V+

V–

GND 50/100 CLK

+IN B

PATENT PENDING

LTC1066-1

OUT B

OUT A

11066-1 BD

–

HIGH SPEED

OP AMP

–

HIGH SPEED

OP AMP

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