MAX3945ETE datasheet(8/24 Pages) MAXIM

Part #	MAX3945ETE

Description	1.0625Gbps to 11.3Gbps, SFP Dual-Path Limiting Amplifier

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Manufacturer	MAXIM [Maxim Integrated Products]

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8 ______________________________________________________________________________________

1.0625Gbps to 11.3Gbps,

SFP+ Dual-Path Limiting Amplifier

Typical Operating Characteristics (continued)

(VCC = 3.3V, TA = +25NC, unless otherwise noted. Registers are set to default values, unless otherwise noted, and the 3-wire interface

is static during measurements.)

DIFFERENTIAL OUTPUT SIGNAL LEVEL

vs. SET_CML DAC SETTING

SET_CML DAC SETTING

250

200

100

150

500

600

700

800

1000

900

1100

1200

400

50

300

RXDE_EN = 0

RXDE1 = 0, RXDE0 = 0

RXDE1 = 0, RXDE0 = 1

RXDE1 = 1,

RXDE0 = 0

RXDE1 = 1,

RXDE0 = 1

DEEMPHASIS VALUE

vs. SET_CML DAC SETTING

(RATE_SEL = 1)

SET_CML DAC SETTING

200

150

100

2

4

6

0

50

250

RXDE1 = 1, RXDE0 = 1

RXDE1 = 1, RXDE0 = 0

RXDE1 = 0, RXDE0 = 1

RXDE1 = 0,

RXDE0 = 0

RXDE_EN = 0

Rx INPUT-BASED LOS THRESHOLD vs. DAC

CODE (LOS1_EN = 1 AND LOS2_EN = 0)

SET_LOS[5:0] DAC CODE

60

50

10

20

30

40

20

40

60

80

100

120

140

160

0

70

DEASSERT

ASSERT

RSSI MONITOR-BASED LOS THRESHOLDS

(LOS1_EN = 0 AND LOS2_EN = 1)

SET_LOS[5:0] DAC CODE

60

50

30

40

20

10

20

40

60

80

100

120

140

160

180

0

70

DEASSERT

ASSERT

LOS MASKING TIME vs. DAC SETTING

SET_LOSTIMER[6:0] DAC CODE

120

100

80

60

40

20

1000

2000

3000

4000

5000

0

DETERMINISTIC JITTER vs. INPUT AMPLITUDE AT 1.25Gbps

(K28.5 PATTERN, 933MHz INPUT FILTER)

SIGNAL AMPLITUDE (mVP-P)

1000

800

600

400

200

10

15

20

25

5

0

1200

RATE_SEL = 0, BW1 = 0, BW2 = 0

DETERMINISTIC JITTER AT 10.32Gbps

(PRBS7 PATTERN WITH 100 CIDs, RATE_SEL = 1)

INPUT SIGNAL AMPLITUDE (mVP-P)

1000

800

200

400

600

1

2

3

4

5

6

7

8

9

10

0

1200

DETERMINISTIC JITTER vs. DATA RATE

(INPUT = 100mVP-P)

DATA RATE (Gbps)

9

6

3

5

10

15

20

25

0

12

K28.5 PATTERN, RATE_SEL = 1

DJ WITH 100mVP-P NOISE

ON POWER SUPPLY

DJ WITH NO NOISE ON POWER SUPPLY

POWER-SUPPLY CURRENT vs. TEMPERATURE

(SET_CML[7:0] = 91d)

TEMPERATURE (°C)

80

60

40

20

0

-20

30

40

50

60

70

80

20

-40

100

LOS2_EN = 0 AND LOS1_EN = 1

LOS2_EN = 1 AND LOS1_EN = 0

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