© 1999 National Semiconductor Corporation

http://www.national.com

Printed in the U.S.A.

N

General Description

The DAC14135 is a monolithic 14-bit, 135MSPS digital-to-analog

converter. The device has been optimized for use in cellular base

stations and other applications where high resolution, high

sampling rate, wide dynamic range, and compact size are

required. The DAC14135 has many integrated features including

a proprietary segmented DAC core, differential current outputs, a

band-gap voltage reference, and TTL/CMOS compatible inputs.

The converter features an 85dBc spurious free dynamic range

(SFDR) at low frequencies and a 70dBc SFDR with 20MHz

output signals. The 48-pin TSSOP package provides an extremely

small footprint for applications where space is a critical consider-

ation. The DAC14135 operates from a single +5V power supply.

The digital power supply can also operate from +3.3V for lower

power consumption and compatibility with +3.3V data inputs. The

DAC14135 is fabricated in a 0.5µm CMOS process and is speci-

fied over the industrial temperature range of -40°C to +85°C.

National Semiconductor thoroughly tests each part to verify full

compliance with the guaranteed specifications.

DAC14135

14-bit, 135MSPS D/A Converter

Features

• 135 MSPS

• Wide dynamic range

• Differential Current Outputs

• Low power consumption: 185mW

• Very small package: 48-pin TSSOP

• TTL/CMOS (+3.3V or +5V) inputs

Applications

• Cellular Basestations:

GSM, WCDMA, DAMPS, etc.

• Multi-carrier Basestations

• Multi-standard Basestations

• Direct digital synthesis (DDS)

• ADSL modems

• HFC modems

November 1999

W-CDMA ACPR

Frequency (MHz)

-120

-40

-80

-90

-100

-30

2468

10

12

14

16

-110

Four-Tone SFDR

Frequency (MHz)

-100

-20

-40

-60

0

510

15

20

25

30

-80

Ampl. = 0dBFS

-50

-60

-70

ACPR Lower

72.1dB

ACPR Upper

73dB

SFDR > 70dBc