XRD64L44AIV 查看數據表（PDF） - Exar Corporation

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XRD64L44AIV

Dual 10-Bit 50MSPS CMOS ADC

Exar Corporation 

Preliminary

FEATURES

• 10-Bit Resolution

• Two Monolithic Complete 10-Bit ADCs

• 50 MSPS Conversion Rate

• On-Chip Track-and-Hold

• On-Chip Voltage Reference

• Low 5 pF Input Capacitance

• TTL/CMOS Outputs

• Tri-State Output Buffers

• Single +3V or +5V Power Supply Operation

• Low Power Dissipation: 250mW-typ @ 3.0V

• -40°C to +85°C Operation Temperature Range

XRD64L44

Dual 10-Bit 50MSPS CMOS ADC

APPLICATIONS

• Medical Ultrasound Imaging

• I & Q Modems

March 2000-1

BENEFITS

• Reduction of Components

• Reduction of System Cost

• High Performance @ Low Power Dissipation

• Long Term Time and Temperature Stability

GENERAL DESCRIPTION

The XRD64L44 is two 10-bit, monolithic, 50 MSPS

ADCs. Manufactured using a standard CMOS pro-

cess, the XRD64L44 offers low power, low cost and

excellent performance. The on-chip track-and-hold

amplifier(T/H) and voltage reference (VREF) eliminate

the need for external active components, requiring only

an external ADC conversion clock for the application.

The XRD64L44 analog input can be driven with ease

due to the high input impedance of RIN = 25KOhms

and CIN = 5pF.

The design architecture uses 17 time- interleaved 10-

bit SAR ADCs in each converter to achieve high

conversion rate of 50 MSPS minimum. In order to

insure and maintain accurate 10-bit operation with

respect to time and temperature, XRD64L44 incorpo-

rates an auto-calibration circuit which continuously

adjusts and matches the offset and linearity of each

ADC. This auto-calibration circuit is transparent to the

user after the initial 3.4ms calibration (168,000 initial

clock cycles).

The power dissipation is only 250mW at 50 MSPS and

225mW at 40 MSPS with +3.0V power supply.

The digital output data is straight binary format, and

the tri-state disable function is provided for common

bus interface.

The XRD64L44 internal reference provides cost sav-

ings and simplifies the design/development. The out-

put voltage of the internal reference is set by two

external resistors. The internal reference can be dis-

abled if an external reference is used for a power

savings of 50mW.

ORDERING INFORMATION

Part Number

XRD64L44AIV

Package Type

64-Lead TQFP

Temperature Range

-40°C to +85°C

Rev. P1.00

EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • (510) 668-7000 • FAX (510) 668-7017

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