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MX7837AR+

P1-P3P4-P6P7-P9P10-P12
_______________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 2kΩ 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
____________________________Features
♦ Two 12-Bit Multiplying DACs with Buffered
Voltage Output
♦ Specified with ±12V or ±15V Supplies
♦ No External Adjustments Required
♦ Fast Timing Specifications
♦ 24-Pin DIP and SO Packages
♦ 12-Bit Parallel Interface (MX7847)
8-Bit + 4-Bit Interface (MX7837)
______________Ordering Information
Ordering Information continued on last page.
* Contact factory for availability and processing to MIL-STD-883.
MX7837/MX7847
Complete, Dual, 12-Bit
Multiplying DACs
________________________________________________________________
Maxim Integrated Products
1
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
DB0/DB8
DB1/DB9
DB2/DB10
DB3/DB11
DB4
DB5
DB6
DB7
A0
A1
LDAC
WR
R
FBB
DGND
V
REFB
V
OUTB
AGNDB
V
SS
V
DD
AGNDA
V
OUTA
V
REFA
R
FBA
CS
DIP/SO
TOP VIEW
MX7837
14
MX7847 on last page.
_________________Pin Configurations
4
8
12
DAC LATCH A
MSB
INPUT
LATCH
LSB
INPUT
LATCH
DAC A
4
8
12
DAC LATCH B
MSB
INPUT
LATCH
LSB
INPUT
LATCH
DAC B
CONTROL
LOGIC
LDAC
CS
WR
A0
A1
DB7
DB0
V
REFB
V
REFA
R
FBA
V
OUTA
AGNDA
R
FBB
V
OUTB
AGNDB
DGND V
SS
V
DD
MX7837
MX7847 on last page.
_________Typical Operating Circuits
Call toll free 1-800-998-8800 for free samples or literature.
19-0158; Rev 0; 7/93
PART TEMP. RANGE PIN-PACKAGE
MX7837JN
0°C to +70°C 24 Narrow Plastic DIP
MX7837KN 0°C to +70°C 24 Narrow Plastic DIP
MX7837JR 0°C to +70°C 24 Wide SO
MX7837KR 0°C to +70°C 24 Wide SO
MX7837C/D 0°C to +70°C Dice*
ERROR
(LSB)
±1
±1/2
±1
±1/2
±1
MX7837/MX7847
Complete, Dual, 12-Bit
Multiplying DACs
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
V
DD
to DGND, AGNDA, AGNDB............................-0.3V to +17V
V
SS
to DGND, AGNDA, AGNDB (Note 1) ..............+0.3V to -17V
V
REFA
, V
REFB
to AGNDA, AGNDB .. (V
SS
- 0.3V) to (V
DD
+ 0.3V)
AGNDA, AGNDB to DGND.........................-0.3V to (V
DD
+ 0.3V)
V
OUTA
, V
OUTB
to AGNDA, AGNDB .....(V
SS
- 0.3V) to (V
DD
+ 0.3V)
R
FBA
, R
FBB
to AGNDA, AGNDB .......(V
SS
- 0.3V) to (V
DD
+ 0.3V)
Digital Inputs to DGND...............................-0.3V to (V
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +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
ELECTRICAL CHARACTERISTICS
(V
DD
= 11.4V to 16.5V, V
SS
= -11.4V to -16.5V, AGNDA = AGNDB = DGND = 0V, V
REFA
= V
REFB
= +10V, R
L
= 2kΩ, C
L
= 100pF,
V
OUT
connected to R
FB
(MX7837), T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 2)
Note 1: If V
SS
is open-circuited with V
DD
and either AGND applied, the V
SS
pin will float positive exceeding the
Absolute Maximum Ratings
.
If this possibility exists, a Schottky diode connected between V
SS
and 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.
PARAMETER SYMBOL MIN TYP MAX UNITS
±4
±2
Differential Nonlinearity DNL ±1 LSB
Relative Accuracy INL
±1/2
LSB
±3
Zero-Code Offset Error
±5
mV
±5
±2
Resolution N 12 Bits
±1
Loaded with all 0s,
tempco =
±5µV/°C typ
CONDITIONS
MX78_7J/A
T
A
= +25°C
Guaranteed monotonic
MX78_7K/B/T
MX78_7K/B
MX78_7S/T
MX78_7J/A/S
MX78_7K/B/T
MX78_7J/A/S
T
A
= +25°C
MX78_7J/A/S ±7
Gain Error
Loaded with all 1s,
tempco = ±2ppm
of FSR/°C typ
T
A
= T
MIN
to T
MAX
MX78_7K/B/T ±4
LSB
V
REF
Input Resistance 81013kΩ
V
REFA
, V
REFB
Resistance
Matching
±0.5 ±3 %
Input High Voltage 2.4
V
Input Low Voltage 0.8
Input Current Digital inputs at 0V and V
DD
±1 µA
Input Capacitance (Note 4) 8 pF
DC Output Impedance 0.2 Ω
Short-Circuit Current V
OUT
connected to AGND 15 mA
V
INH
T
A
= T
MIN
to T
MAX
V
INL
STATIC PERFORMANCE (Note 3)
REFERENCE INPUTS
DIGITAL INPUTS
ANALOG OUTPUTS
MX7837/MX7847
Complete, Dual, 12-Bit
Multiplying DACs
_______________________________________________________________________________________ 3
PARAMETER SYMBOL MIN TYP MAX UNITSCONDITIONS
±0.01
±0.01
±0.01
Power-Supply Rejection
±0.01
% per %
Voltage-Output Settling
Time
t
S
Settling time to within ±1/2LSB of final DAC value;
DAC latch alternately loaded will all 0s and all 1s
4 µs
Slew Rate 7 V/µs
Digital-to Analog Glitch
Impulse
Q
DAC latch alternately loaded with 01…11 and
10…00
60 nV-s
Channel-to-Channel Isolation
(V
REFA
to V
OUTB
,
V
REFB
to V
OUTA
)
V
REF
= 20p-p, 10kHz sine wave, Alternate DAC
Latch Loaded with all 0s
-95 dB
Multiplying Feedthrough
Error
-90 dB
Unity-Gain Small-Signal
Bandwidth
THD
1 MHz
Full-Power Bandwidth 125 kHz
Total Harmonic Distortion V
REF
= 6V
RMS
, 1kHz, DAC latch loaded with all 1s -88 dB
Digital Crosstalk
Code transition from all 0s to all 1s; see
Typical
Operating Characteristics
graphs
10 nV-s
Output Noise Voltage at
+25°C (0.1Hz to 10Hz)
Amplifier noise and Johnson noise of R
FB
2 µV
RMS
V
DD
Range V
DD
11.4 16.5 V
Positive Supply Current I
DD
510mAOutput unloaded
Negative Supply Current I
SS
46mAOutput unloaded
V
SS
Range V
SS
-11.4 -16.5 V
V
REF
= 20V
p-p
Sine wave, DAC latch loaded with
all 1s
V
REF
= 100mV
p-p
sine wave, DAC latch loaded
with all 1s
V
REF_
= 20V
p-p
, 10kHz sine wave, latches loaded
with all 0s
V
SS
= -12V ±5%, V
REF
= 8.9V
V
DD
= 12V ±5%, V
REF
= -8.9V
V
SS
= -15V ±5%, V
REF
= 10V
V
DD
= 15V ±5%, V
REF
= -10V∆Gain/∆V
DD
∆Gain/∆V
SS
∆Gain/∆V
SS
∆Gain/∆V
DD
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 11.4V to 16.5V, V
SS
= -11.4V to -16.5V, AGNDA = AGNDB = DGND = 0V, V
REFA
= V
REFB
= +10V, R
L
= 2kΩ, C
L
= 100pF,
V
OUT
connected to R
FB
(MX7837), T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
Note 2: The analog outputs can swing to within 2.5V of the supply rails. Hence, for good linearity towards full-scale, |V
REFA
| and |V
REFB
| must
be at least 2.5V lower than V
DD
and |V
SS
|. Tests done with supply voltages below ±12.5V are done with V
REFA
= V
REFB
= ±8.9V.
Note 3: Static performance tested at V
DD
= +15V, V
SS
= -15V. Performance over supplies guaranteed by PSRR test.
Note 4: Guaranteed by design.
POWER REQUIREMENTS
AC CHARACTERISTICS
P1-P3P4-P6P7-P9P10-P12

MX7837AR+

Mfr. #:
Buy MX7837AR+
Manufacturer:
Maxim Integrated
Description:
Digital to Analog Converters - DAC 12-Bit 12Ch Precision ADC
Lifecycle:
New from this manufacturer.
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