MAX7841 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – Octal, 14-Bit Voltage-Output DAC with Parallel Interface

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 ±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.
Applications
Automatic Test Equipment (ATE)
Industrial Process Controls
Arbitrary Function Generators
Avionics Equipment
Minimum Component Count Analog Systems
Digital Offset/Gain Adjustment
SONET Applications
Functional Diagram appears at end of data sheet.
Features
o Full 14-Bit Performance Without Adjustments
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 31µs 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
PART
MX7841BS
MX7841AS
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
44 MQFP
44 MQFP
INL
(LSB)
±2
±4
TOP VIEW
Pin Configuration
DUTGNDAB 1
OUTA 2
REFAB- 3
REFAB+ 4
V_DD 5
V_SS 6
LDAC 7
A2 8
A1 9
A0 10
CS 11
MX7841
33 DUTGNDGH
32 OUTH
31 REFGH-
30 REFGH+
29 CLR
28 DB13
27 DB12
26 DB11
25 DB10
24 DB9
23 DB8
MQFP
________________________________________________________________ Maxim Integrated Products 1
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