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MX7841AS Datasheet

  • MX7841AS

  • Octal, 14-Bit Voltage-Output DAC with Parallel Interface

  • 14頁(yè)

  • MAXIM   MAXIM

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19-2953; Rev 0; 7/03
Octal, 14-Bit Voltage-Output DAC
with Parallel Interface
General Description
The MX7841 contains eight 14-bit, voltage-output digi-
tal-to-analog converters (DACs). On-chip precision out-
put amplifiers provide the voltage outputs. The device
operates from 鹵15V supplies. Its bipolar output voltage
swing ranges from (V
SS
+ 2.5V) to (V
DD
- 2.5V) and is
achieved with no external components. The MX7841
has three pairs of differential reference inputs; two of
these pairs are connected to two DACs each, and a
third pair is connected to four DACs. The references
are independently controlled, providing different full-
scale output voltages to the respective DACs.
The MX7841 features double-buffered interface logic
with a 14-bit parallel data bus. Each DAC has an input
latch and a DAC latch. Data in the DAC latch sets the
output voltage. The eight input latches are addressed
with three address lines. Data is loaded to the input
latch with a single write instruction. An asynchronous
load input (LDAC) transfers data from the input latch to
the DAC latch. The
LDAC
input controls all DACs;
therefore, all DACs can be updated simultaneously by
asserting
LDAC.
An asynchronous
CLR
input sets the output of all eight
DACs to the respective DUTGND input of the op amp.
Note that
CLR
is a CMOS input, which is powered by
V
DD
. All other logic inputs are TTL/CMOS compatible.
The MX7841 is pin-for-pin compatible with AD7841.
o
Eight DACs in a Single Package
o
Buffered Voltage Outputs
o
Unipolar or Bipolar Voltage Swing of (V
SS
+ 2.5V)
to (V
DD
- 2.5V)
o
31碌s Output Settling Time
o
Low Power Consumption: 8mA (typ)
o
Small 44-Pin MQFP Package
o
Double-Buffered Digital Inputs
o
Asynchronous Load Updates All DACs
Simultaneously
o
Asynchronous
CLR
Forces All DACs to
DUTGND_ _ Potential
Features
o
Full 14-Bit Performance Without Adjustments
MX7841
Ordering Information
PART
MX7841BS
MX7841AS
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
PIN-
PACKAGE
44 MQFP
44 MQFP
INL
(LSB)
鹵2
鹵4
Applications
Automatic Test Equipment (ATE)
Industrial Process Controls
Arbitrary Function Generators
Avionics Equipment
Minimum Component Count Analog Systems
Digital Offset/Gain Adjustment
SONET Applications
DUTGNDAB
OUTA
REFAB-
REFAB+
V
DD
V
SS
LDAC
A2
A1
A0
CS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Configuration
TOP VIEW
OUTB
OUTC
44
43
42
41
40
39
38
37
36
35
34
DUTGNDCD
OUTD
REFCDEF-
REFCDEF+
V
DD
OUTE
DUTGNDEF
OUTF
OUTG
33
32
31
30
29
28
27
26
25
24
23
17
18
19
20
21
22
DUTGNDGH
OUTH
REFGH-
REFGH+
CLR
DB13
DB12
DB11
DB10
DB9
DB8
MX7841
Functional Diagram appears at end of data sheet.
WR
V
CC
GND
DB0
DB1
DB2
DB3
MQFP
________________________________________________________________
Maxim Integrated Products
DB4
DB5
DB6
DB7
1
For pricing delivery, and ordering information please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

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