AD7943 Datasheet, PDF (1/16 Pages) Analog Devices – +3.3 V/+5 V Multiplying 12-Bit DACs

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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
APPLICATIONS
Battery-Powered Instrumentation
Laptop Computers
Upgrades for All 754x Series DACs (5 V Designs)
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).
The AD7945 is available in 20-lead DIP, 20-lead SOP and 20-
lead SSOP.
The AD7948 is available in 20-lead DIP, 20-lead SOP and 20-
lead SSOP.
+3.3 V/+5 V Multiplying
12-Bit DACs
AD7943/AD7945/AD7948
FUNCTIONAL BLOCK DIAGRAMS
V_DD
V_REF
AD7943
CLR
LD1
LD2
R_FB
12-BIT DAC
DAC REGISTER
I_OUT1
I_OUT2
AGND
SRI
INPUT SHIFT REGISTER
SRO
V_REF
CS
WR
STB1 STB2 STB3 STB4 DGND
V_DD
R_FB
AD7945
12-BIT DAC
12
I_OUT1
AGND
INPUT LATCH
12
DB11–DB0
DGND
V_DD
R_FB
V_REF
12-BIT DAC
12
DATA OVERRIDE LOGIC
12
DAC REGISTER
12
INPUT REGISTERS
12
DATA STEERING LOGIC
8
DB7–DB0
AD7948
CONTROL
LOGIC
I_OUT1
AGND
DF/DOR
CTRL
LDAC
WR
CSLSB
CSMSB
DGND
REV. B
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© Analog Devices, Inc., 1998