Файл:AD7943, AD7945, AD7948.pdf

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a FEATURES 12-Bit Multiplying DACs Guaranteed Specifications with +3.3 V/+5 V Supply 0.5 LSBs INL and DNL Low Power: 5 ␮W typ Fast Interface 40 ns Strobe Pulsewidth (AD7943) 40 ns Write Pulsewidth (AD7945, AD7948) Low Glitch: 60 nV-s with Amplifier Connected Fast Settling: 600 ns to 0.01% with AD843

+3.3 V/+5 V Multiplying 12-Bit DACs AD7943/AD7945/AD7948 FUNCTIONAL BLOCK DIAGRAMS VDD

RFB

AD7943

IOUT1

12-BIT DAC

VREF

IOUT2

CLR LD1 LD2

DAC REGISTER

AGND

SRI

INPUT SHIFT REGISTER

SRO

APPLICATIONS Battery-Powered Instrumentation Laptop Computers Upgrades for All 754x Series DACs (5 V Designs) STB1 STB2 STB3 STB4 VDD

GENERAL DESCRIPTION

The AD7943, AD7945 and AD7948 are fast 12-bit multiplying DACs that operate from a single +5 V supply (Normal Mode) and a single +3.3 V to +5 V supply (Biased Mode). The AD7943 has a serial interface, the AD7945 has a 12-bit parallel interface, and the AD7948 has an 8-bit byte interface. They will replace the industry-standard AD7543, AD7545 and AD7548 in many applications, and they offer superior speed and power consumption performance. The AD7943 is available in 16-lead DIP, 16-lead SOP (Small Outline Package) and 20-lead SSOP (Shrink Small Outline Package).

RFB

AD7945

The AD7948 is available in 20-lead DIP, 20-lead SOP and 20lead SSOP.

IOUT1

12-BIT DAC

VREF

AGND

12 CS WR

INPUT LATCH 12 DB11–DB0

VREF

DGND

RFB

VDD

IOUT1

12-BIT DAC 12

The AD7945 is available in 20-lead DIP, 20-lead SOP and 20lead SSOP.

DGND

AGND

AD7948 DF/DOR CTRL

DATA OVERRIDE LOGIC 12

LDAC

DAC REGISTER 12 INPUT REGISTERS

WR CONTROL LOGIC CSLSB

12

CSMSB

DATA STEERING LOGIC 8 DB7–DB0

DGND

REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1998


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