AFD4400 datasheet(41/101 Pages) NXP

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Electrical characteristics

AFD4400 Digital Front End Processor Data Sheet, Rev. 0

Freescale Semiconductor

3.1.6

SerDes DC parameters

The following subsections define the DC-level requirements for the CPRI, SGMII and JESD204B data lines.

3.1.6.1

DC-level requirements for CPRI configurations

This section provide various DC-level requirements for CPRI configurations.

This table provides the CPRI-LV-XAUI based transmitter DC specifications.

This table provides the CPRI-LV-XAUI based receiver DC specifications.

Rres

Driver 240

Ω unit

calibration resolution

——

—

Rkeep

Pad keeper resistance

—

105

135

175

3,4

Rod_keep

Maximum external

resistor value that is

guaranteed to overdrive

the pad keeper

——

—

Note:

1. VTT is not applied directly to the device. It is the supply to which far end signal termination is made, and it is expected to

be equal to Vref with a min value of Vref - 0.04 and a max value of Vref + 0.04. VTT should track variations in the DC

level of Vref.

2. Typ condition: typ model, VDDDDR 1.5 V, and 25 °C. Max condition: bcs model, VDDDDR1.575 V, and –40 °C. Min

condition: wcs model, VDDDDR 1.425 V, and 125 °C.

3. Typ condition: typ model, VDDDDR 1.5 V, and 25 °C, max condition: wcs model, VDDDDR 1.425 V, and 125 °C, min

condition: bcs model, VDDDDR 1.575 V, and –40 °C. These values are for digital IO buffers.

4. Values are based on simulated numbers and are not measured on silicon.

Table 11. Transmitter DC specifications (LV: 1.2288, 2.4576 and 3.072 Gbps)(SDn_XPADVDD=1.5)

Symbol

Characteristic

Min

Nom

Max

Unit

Note

VDIFF_P-P

Differential Output Voltage

800

1600

mV p–p

—

Differential resistance

100

120

—

Table 12. Receiver DC specifications (LV: 1.2288, 2.4576 and 3.072 Gbps) (SDn_XPADVDD=1.5)

Symbol

Characteristic

Min

Nom

Max

Unit

Note

VIN

Differential input voltage

200

1600

mV p–p

—

RIN

Differential resistance

120

—

Table 10. DDR DC electrical characteristics (continued)

Symbol

Parameter

Test

conditions

Min

Typ

Max

Unit

Notes

AFD4400 Datasheet(PDF) 41 Page - NXP Semiconductors

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