LTC6412IUF#PBF Datasheet LTC6412IUF#PBF, LTC6412CUF#TRPBF, LTC6412IUF#TRPBF | P19-P21

LTC6412

19

6412fa

Figure 3. Demo Board DC1464A Circuit Schematic. Test Circuit A

APPLICATIONS INFORMATION

V

CC

GND SHDN

LTC6412

EN GND V

CC

DECL1

GND

+IN

–IN

V

CM

V

CM

V

CC

V

CC

V

CC

V

CC

GND

1

2

C5

10nF

V

CC

V

CC

V

CC

C2 1000pF

C3 0.1μF

C2 1000pF

C4 0.1μF

C8

10nF

C13

1000pF

C14

0.1μF

C16

1000pF

C22

0.1μF

C15

0.1μF

C11

10nF

C17

0.1μF

CA1

1μF

CB1

4.7μF

NOTE:

[1] DO NOT PLACE

C12

1000pF

C21

0.1μF

+OUT

–OUT

C6

0.1μF

C9

[1]

C20

[1]

C7 0.1μF

V

CC

R17

100Ω

T1

1:1

3

1

2

3

5

R7

[1]

R9

0Ω

40dB

+IN

–IN

4

5

6

18

24 23 22 21 20 19

789101112

17

16

15

14

13

+OUT

–OUT

GND

DECL2

V

CC

GND +V

G

V

REF

–V

G

GND

••

V

CC

GND

3.00V TO 3.60V

T3

1:1

T4

1:1

13

2

1

4

5

C18 0.1μF

C19 0.1μF

2

3

5

R21

0Ω

4

TEST IN TEST OUT

6412 F03

••

R15 0Ω

T2

4:1

1

2

3

5

4

R14 [1]

V

GAIN

+V

G

–V

G

R18 [1]

R20

100Ω

R19 0Ω

•

R5

1k

R6

1k

R3

[1]

R1

1k

R4

1k

R2

[1]

V

CC

SHDN EN

R22

0Ω

BALUN

T1, T3, T4

T2

PART NUMBER

TYCO MABA-007159

MINI-CIRCUITS TCM4-19+

Figure 4. 4-Port Analysis Schematic. Test Circuit B

V

CC

SHDN

EN

GND

V

CM

V

REF

DECL1

DECL2

+V

G

–V

G

+IN

10nF

3.3V

1nF

0.1μF

+OUT

I

DC

–OUT

6412 F04

0.1μF

0.1μF0.1μF

GAIN CONTROL

(– SLOPE MODE)

INPUT REF

PLANE

OUTPUT REF

PLANE

LTC6412

–IN

PORT 3

50Ω

PORT 4

50Ω

1/2 AGILENT

E5071C

PORT 1

50Ω

PORT 2

50Ω

1/2 AGILENT

E5071C

I

DC

LTC6412

20

6412fa

Figure 7. Large-Signal Output Equivalent Circuit Schematic Figure 8. Small-Signal Output Equivalent Circuit Model

200Ω

50Ω12.5Ω

50Ω

DUT

1:1

IDEAL

TRANSFORMER WITH CENTER TAP

1:1

IDEAL

TRANSFORMER WITH CENTER TAP

DIFFERENTIAL

MODE

PORT 2

DIFFERENTIAL

MODE

PORT 1

COMMON

MODE

PORT 2

COMMON

MODE

PORT 1

+OUT+IN

–OUT–IN

6412 F05

Figure 5. Schematic of Mixed-Mode S-Parameters Reported for Test Circuit B

Figure 6. Deﬁ nition of Mixed-Mode S-Parameters Reported for Test Circuit B

S xyAB

S xyAB =

STIMULUS PORT NUMBER

RESPONSE PORT NUMBER

STIMULUS PORT MODE

RESPONSE PORT MODE

d: DIFFERENTIAL MODE (BALANCED)

c: COMMON MODE (BALANCED)

x MODE SIGNAL OUTPUT ON PORT A

y MODE SIGNAL INPUT ON PORT B

MODE

6412 F06

TO BUFFER

AMP

150Ω0.3pF

0.3pF

8pF

5Ω 5Ω

+OUT

–OUT

6412 F06

LOWPASS FILTER

150Ω

g

m

300Ω

DIFFERENTIAL

MODE ADMITTANCE

IDEAL 1:1

TRANSFORMER

WITH

CENTER TAP

COMMON MODE

ADMITTANCE

175Ω

190Ω

+OUT

–OUT

Z

OUT

1.5pF

5pF 4pF

6412 F08

1nH

APPLICATIONS INFORMATION

LTC6412

21

6412fa

APPLICATIONS INFORMATION

V

CC

0.1μF

C1

10mil

LINE WIDTH

L1

L2

(a)

C2

0.1μF

C

O

Z

OUT

= 200Ω

DIFFERENTIAL

L1 = L2

C1 = C2

NOTE: DASHED LINE COMPONENTS

ARE FOR BANDPASS FILTERING

(SEE TEXT)

L1 = L2

C1 = C2

T2 = MABAES0061

Z

OUT

= 50Ω

SINGLE ENDED

+OUT

–OUT

LTC6412

V

CC

0.1μF

L1

L2

(b)

C2

T2

4:1

C1

C

O

+OUT

–OUT

LTC6412

V

CC

0.1μF

C1

C2 LC

BALUN

6412 F09

L1

L

CHOKE

L2

(d)

+OUT

–OUT

LTC6412

V

CC

0.1μF

(c)

+OUT

–OUT

LTC6412

AT RESONANCE,

L1 = L2 = L

C1 = C2 = C

DIFFERENTIAL

Z

OUT

= 200Ω

2

++

1

C

O

1

C2

1

C1

1

C

O

f

O

=

X

C

=

AT RESONANCE,

SINGLE ENDED

1

2π√LC

1

2πf

O

C

Z

OUT

=

X

C

2

200Ω

Figure 9. Output AC/DC Coupling, Filter and Balun Circuit Design Options

LTC6412IUF#PBF

LTC6412IUF#PBF

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