LTC2000_15 datasheet(16/52 Pages) LINER

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LTC2000

2000f

For more information www.linear.com/LTC2000

pin Functions

AVDD18:1.8VAnalogSupplyVoltageInput.1.71Vto1.89V.

AVDD33: 3.3V Analog Supply Voltage Input. 3.135V to

3.465V.

CKP, CKN: DAC Sample Clock Inputs. Maximum clock

frequency (fDAC) is 2500MHz. Clock signal should be AC

coupled.

CS: Serial Interface Chip Select Input. When CS is low,

SCK is enabled for shifting data on SDI into the register.

When CS is taken high, SCK is disabled and SDO is high

impedance.

DAP[15:0], DAN[15:0]: Port A LVDS Data Inputs. Max-

imumdatarateis1.25Gbps.PortAisusedonlyindual-port

mode. Connect to GND if not used. The data input format

is two’s complement.

DBP[15:0], DBN[15:0]: Port B LVDS Data Inputs. Max-

imum data rate is 1.25Gbps. In single-port mode, only

Port B is used. In dual-port mode, the sample from Port B

appears at IOUTP/N one cycle after the sample from Port A.

The data input format is two’s complement.

DCKIP, DCKIN: LVDS Data Clock Inputs. Maximum

frequency (fDCKI) is 625MHz. In dual-port mode, fDCKI =

fDAC/4. In single-port mode, fDCKI = fDAC/2

DCKOP, DCKON: LVDS Data Clock Outputs. Maximum

frequency is 625MHz. Select frequency (fDAC/4 or fDAC/2),

output current (3.5mA or 7mA), and termination (none or

100Ω) using register 0x02.

DVDD18:1.8VDigitalSupplyVoltageInput.1.71Vto1.89V.

DVDD33: 3.3V Digital Supply Voltage Input. 3.135V to

3.465V.

FSADJ: Full-Scale Adjust Pin. The DAC full-scale current is

16•(VREFIO/RFSADJ).Connecta500ΩresistorfromFSADJ

to GND to set the full-scale current to 40mA.

GND: Ground.

IOUTP, IOUTN: DAC Analog Current Outputs. Differential

output is nominally ±40mA. Maximum update rate is

2.5Gsps. The output current is evenly divided between

IOUTP and IOUTN when the two’s compliment DAC code is

set to mid-scale (all zeros).

PD (Pin S1): Active Low Power-Down Input. When PD is

low, the LTC2000 supply current is less than 440µA. To

exit power-down mode switch PD high to SVDD.

typical perFormance characteristics I

OUTFS = 40mA, TA = 25°C, AVDD18 = DVDD18 = 1.8V,

AVDD33 = DVDD33 = 3.3V, RLOAD = 12.5Ω, LIN_DIS = 0, LIN_ GN = 75% unless otherwise noted.

LTC2000-11 Differential

Nonlinearity (DNL)

LTC2000-11 Single-Tone NSD

vs fOUT and fDAC

LTC2000-11 Integral Nonlinearity

(INL)

CODE

–1024

0.5

1024

2000 G52

–0.5

–1.0

–512

512

1.0

CODE

–1024

0.25

1024

2000 G53

–0.25

–1.50

–512

512

0.50

fOUT (MHz)

–170

–165

–160

–155

–150

–145

200

400

600

800

2000 G54

1000 1200

2.5Gsps

1.25Gsps

DIGITAL AMPLITUDE = 0dBFS

40mA FULL-SCALE CURRENT

0dBm SINGLE TONE

LTC2000 Datasheet(PDF) 16 Page - Linear Technology

LTC2000 Datasheet(HTML) 16 Page - Linear Technology

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