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Maxim Integrated Semiconductor Electronic Components Datasheet

MX7847 Datasheet

Complete / Dual / 12-Bit Multiplying DACs

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19-0158; Rev 0; 7/93
Complete, Dual, 12-Bit
Multiplying DACs
_______________General Description
The MX7837/MX7847 are dual, 12-bit, multiplying, volt-
age-output digital-to-analog converters (DACs). Each
DAC has an output amplifier and a feedback resistor.
The output amplifier is capable of developing ±10V
across a 2k load. The amplifier feedback resistor is
internally connected to V OUT on the MX7847. No exter-
nal trims are required to achieve full 12-bit performance
over the entire operating temperature range.
The MX7847 has a 12-bit parallel data input, whereas
the MX7837 operates with a double-buffered 8-bit-bus
interface that loads data in two write operations. All
logic signals are level triggered and are TTL and CMOS
compatible. Fast timing specifications make these
DACs compatible with most microprocessors.
________________________Applications
Small Component-Count Analog Systems
Digital Offset/Gain Adjustments
Industrial Process Control
Function Generators
Automatic Test Equipment
Automatic Calibration
Machine and Motion Control Systems
Waveform Reconstruction
Synchro Applications
_________________Pin Configurations
TOP VIEW
CS 1
RFBA 2
VREFA 3
VOUTA 4
AGNDA 5
VDD 6
VSS 7
AGNDB 8
VOUTB 9
VREFB 10
DGND 11
RFBB 12
MX7847 on last page.
MX7837
DIP/SO
24 DB0/DB8
23 DB1/DB9
22 DB2/DB10
21 DB3/DB11
20 DB4
19 DB5
18 DB6
17 DB7
16 A0
15 A1
14 LDAC
13 WR
____________________________Features
o Two 12-Bit Multiplying DACs with Buffered
Voltage Output
o Specified with ±12V or ±15V Supplies
o No External Adjustments Required
o Fast Timing Specifications
o 24-Pin DIP and SO Packages
o 12-Bit Parallel Interface (MX7847)
8-Bit + 4-Bit Interface (MX7837)
______________Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
ERROR
(LSB)
MX7837JN
MX7837KN
MX7837JR
MX7837KR
MX7837C/D
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
24 Narrow Plastic DIP
24 Narrow Plastic DIP
24 Wide SO
24 Wide SO
Dice*
±1
±1/2
±1
±1/2
±1
Ordering Information continued on last page.
* Contact factory for availability and processing to MIL-STD-883.
_________Typical Operating Circuits
VDD
VREFA
VREFB
DB0
DB7
LDAC
CS
WR
A0
A1
CONTROL
LOGIC
DGND
MX7847 on last page.
MSB
INPUT
LATCH
4
LSB
INPUT
LATCH
8
DAC LATCH A
12
DAC A
DAC B
12
DAC LATCH B
48
MSB LSB
INPUT INPUT
LATCH LATCH
MX7837
RFBA
VOUTA
AGNDA
RFBB
VOUTB
AGNDB
VSS
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
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Maxim Integrated Semiconductor Electronic Components Datasheet

MX7847 Datasheet

Complete / Dual / 12-Bit Multiplying DACs

No Preview Available !

Complete, Dual, 12-Bit
Multiplying DACs
ABSOLUTE MAXIMUM RATINGS
VDD to DGND, AGNDA, AGNDB ............................-0.3V to +17V
VSS to DGND, AGNDA, AGNDB (Note 1) ..............+0.3V to -17V
VREFA, VREFB to AGNDA, AGNDB .. (VSS - 0.3V) to (VDD + 0.3V)
AGNDA, AGNDB to DGND.........................-0.3V to (VDD + 0.3V)
VOUTA, VOUTB to AGNDA, AGNDB .....(VSS - 0.3V) to (VDD + 0.3V)
RFBA, RFBB to AGNDA, AGNDB .......(VSS - 0.3V) to (VDD + 0.3V)
Digital Inputs to DGND ...............................-0.3V to (VDD + 0.3V)
Continuous Power Dissipation (TA = +70°C)
Narrow Plastic DIP (derate 13.33mW/°C above +70°C)....1067mW
SO (derate 11.76mW/°C above +70°C) .........................941mW
Narrow CERDIP (derate 12.50mW/°C above +70°C) ..1000mW
Operating Temperature Ranges:
MX78_7J_/K_ ........................................................0°C to +70°C
MX78_7A_/B_ .................................................. -40°C to +85°C
MX78_7SQ/TQ ............................................... -55°C to +125°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
Note 1: If VSS is open-circuited with VDD and either AGND applied, the VSS pin will float positive exceeding the Absolute Maximum Ratings.
If this possibility exists, a Schottky diode connected betweeSnS Vand GND ensures the maximum ratings will be observed.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = 11.4V to 16.5V, V SS = -11.4V to -16.5V, AGNDA = AGNDB = DGND = 0V, V REFA = VREFB = +10V, R L = 2k, CL = 100pF,
VOUT connected to RFB (MX7837), TA = TMIN to TMAX, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
STATIC PERFORMANCE (Note 3)
Resolution
N
12 Bits
Relative Accuracy
MX78_7J/A/S
INL
MX78_7K/B/T
±1
±1/2
LSB
Differential Nonlinearity
DNL Guaranteed monotonic
±1 LSB
Zero-Code Offset Error
Loaded with all 0s,
tempco =
±5µV/°C typ
TA = +25°C
TA = TMIN to TMAX
MX78_7J/A
MX78_7K/B
MX78_7S/T
±2
±4
mV
±3
±5
Gain Error
Loaded with all 1s, TA = +25°C
tempco = ±2ppm
of FSR/°C typ TA = TMIN to TMAX
MX78_7J/A/S
MX78_7K/B/T
MX78_7J/A/S
MX78_7K/B/T
±5
±2
LSB
±7
±4
REFERENCE INPUTS
VREF Input Resistance
VREFA, VREFB Resistance
Matching
8 10 13 k
±0.5
±3
%
DIGITAL INPUTS
Input High Voltage
Input Low Voltage
Input Current
Input Capacitance (Note 4)
VINH
VINL
Digital inputs at 0V and VDD
2.4
V
0.8
±1 µA
8 pF
ANALOG OUTPUTS
DC Output Impedance
0.2
Short-Circuit Current
VOUT connected to AGND
15 mA
2 _______________________________________________________________________________________
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Part Number MX7847
Description Complete / Dual / 12-Bit Multiplying DACs
Maker Maxim
Total Page 12 Pages
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