ADC14X250 datasheet(12/69 Pages) TI1

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ADC14X250

SLASE49 – DECEMBER 2015

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(1)

Specification applies to the electrical level diagram of Figure 3

(2)

Specification applies to the electrical circuit diagram of Figure 4

6.10 Electrical Characteristics: Serial Data Output Interface

Unless otherwise noted, these specifications apply for VA3.0 = 3 V; VA1.8 = 1.8 V; VA1.2 = 1.2 V; FCLKIN = FS = 250 MSPS.

Typical values are at TA = 25°C.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SERIAL LANE OUTPUT CHARACTERISTICS (SO)

VOD

Output differential voltage(1)

Differential peak-peak values. Assumes ideal 100-

Ω load. De-

emphasis disabled.

Configurable via SPI.

570

660

750

840

930

1030

1130

1200

ISC

Short circuit current. SO+ terminal shorted to GND during logic high

output signal state.

VOD and Rdeemp configured to default values.

Zddiff

Differential output impedance at DC.(2)

VOD configured to default value.

100

RLddiff

Differential output return loss magnitude

Relative to 100

Ω; For frequencies between 100 MHz and

0.75*Baud_Rate (5.5 GHz max); VOD and Rdeemp configured to

default values.

–11

Rdeemp

Transmitter de-emphasis values

VOD configured to 4.

Configurable via SPI.

1.4

3.4

4.9

5.9

7.4

8.9

12.1

(1)

Specification applies to the electrical level diagram of Figure 5.

(2)

This parameter is verified by design.

(3)

The SPI_CFG register must be changed to a supported output logic level after power up and before a read command is executed. Until

that time, the output voltage on SDO may be as high as the VA3.0 supply during a read command. The SDO output is high-Z at all times

except during a read command.

6.11 Electrical Characteristics: Digital Input

Unless otherwise noted, these specifications apply for VA3.0= 3 V; VA1.8 = 1.8 V; VA1.2 = 1.2 V; FCLKIN = FS = 250 MSPS.

Typical values are at TA = 25°C. Limit values specified for the temperature range TA-MIN = –40°C to TP-MAX = 105°C.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

DIGITAL INPUT CHARACTERISTICS (SDI, SCLK, CSB)

VIH

Logical 1 input voltage(1)

Inputs are compatible with 1.2-V up to 3.0-V logic.

0.9

VIL

Logical 0 input voltage(1)

0.3

IIN0

Logic low input current

0.04

IIN1

Logic high input current

0.04

CIN

Input capacitance(2)

DIGITAL OUTPUT CHARACTERISTICS (SDO)

VOH

Logical 1 output voltage(1)(3)

VSPI = 1.2, 1.8, 2.5, or 3.0 V ; Configurable via SPI.

Default VSPI = 1.8V. IOH = 400 µA.

VSPI – 0.3

VSPI

(3)

VOL

Logical 0 output voltage(1)(3)

IOL = –400 µA.

0.0

0.3

+ISC

Logic high short circuit current. Applies to default VSPI = 1.8V.

–ISC

Logic low short circuit current. Applies to default VSPI = 1.8V.

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