LTC5599IUFPBF View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC5599IUFPBF

30MHz to 1300MHz Low Power Direct Quadrature Modulator

Linear Technology 

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LTC5599

Applications Information

Table 4. I/Q Gain Ratio Step Size vs Digital Gain

Setting (continued)

DG (dB)

–16

G (V/V)

0.158

∆GI/GQ (mdB)

30.7

–17

0.141

34.6

–18

0.126

39.0

–19

0.112

44.1

The conversion gain of the I-channel and Q-channel are

equal for NIQ = 128. The I-channel gain is larger than the

Q-channel gain for NIQ > 128.

Disable Q-Channel

Table 5. Register 0x00 Setting vs LO Frequency (continued)

REGISTER VALUE

LO FREQUENCY RANGE (MHz)

DECIMAL BINARY HEX LOWER BOUND UPPER BOUND

15

0001111 0F

961.8

988.2

16

0010000 10

941.3

961.7

17

0010001 11

921.5

941.2

18

0010010 12

895.2

921.4

19

0010011 13

877.6

895.1

20

0010100 14

863.6

877.5

21

0010101 15

843.2

863.5

22

0010110 16

826.9

843.1

23

0010111 17

807.0

826.8

If bit 5 in register 0x01 (QDISABLE) is set, the Q-channel

24

0011000 18

792.3

806.9

is switched off, turning the I/Q modulator into an upcon-

25

0011001 19

772.2

792.2

version mixer. It is recommended to float the BBPQ and

26

0011010 1A

752.7

772.1

BBMQ pins in this mode. The default mode is Q-channel

27

0011011 1B

734.0

752.6

is on (QDISABLE = 0).

28

0011100 1C

724.2

739.9

LO Section (Register 0x00)

29

0011101 1D

30

0011110 1E

704.6

688.7

724.1

704.5

The internal LO chain consists of a poly-phase filter which

31

0011111 1F

673.2

688.6

generates the I and Q signals for the image-reject double-

32

0100000 20

655.2

673.1

balanced mixer. The center frequency of the poly-phase

33

0100001 21

638.1

655.1

filter is set by the lower seven bits of register 0x00. The

34

0100010 22

624.6

638.0

recommended settings vs LO frequency are given in Table 5

35

0100011 23

611.9

624.5

(see the QuikEval™ GUI).

36

0100100 24

598.4

611.8

Table 5. Register 0x00 Setting vs LO Frequency

REGISTER VALUE

LO FREQUENCY RANGE (MHz)

DECIMAL BINARY HEX LOWER BOUND UPPER BOUND

0

0000000 00

N/A

N/A

1

0000001 01

1249.1

1300.0

2

0000010 02

1248.6

1249.0

3

0000011 03

1238.1

1248.5

4

0000100 04

1214.1

1238.0

5

0000101 05

1191.2

1214.0

6

0000110 06

1165.6

1191.1

7

0000111 07

1141.0

1165.5

8

0001000 08

1120.6

1140.9

9

0001001 09

1100.5

1120.5

10

0001010 0A

1069.5

1100.4

11

0001011 0B

1039.6

1069.4

12

0001100 0C

1023.1

1039.5

13

0001101 0D

1007.1

1023.0

14

0001110 0E

988.3

1007.0

37

0100101 25

38

0100110 26

39

0100111 27

40

0101000 28

41

0101001 29

42

0101010 2A

43

0101011 2B

44

0101100 2C

45

0101101 2D

46

0101110 2E

47

0101111 2F

48

0110000 30

49

0110001 31

50

0110010 32

51

0110011 33

52

0110100 34

53

0110101 35

54

0110110 36

585.1

573.9

563.1

548.1

538.1

529.1

518.5

507.0

497.7

488.0

471.5

457.7

448.7

437.4

426.6

417.5

407.5

398.0

598.3

585.0

573.8

563.0

548.0

538.0

529.0

518.4

506.9

497.6

487.9

471.4

457.6

448.6

437.3

426.5

417.4

407.4

5599f

For more information www.linear.com/LTC5599

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