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PDF MX7535JCWI Data sheet ( Hoja de datos )
| Número de pieza | MX7535JCWI | |
| Descripción | Microprocessor-Compatible / 14-Bit DACs | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1116; Rev 1; 11/96
Microprocessor-Compatible,
14-Bit DACs
_______________General Description
The MX7534/MX7535 are high-performance, CMOS,
monolithic, 14-bit digital-to-analog converters (DACs).
Wafer-level, laser-trimmed, thin-film resistors and tempera-
ture-compensated NMOS switches assure operation over
the full operating temperature range with exceptional lin-
ear and gain stability.
The MX7534 accepts right-justified data in two bytes from
an 8-bit bus, while the MX7535 operates with a 14-bit data
bus with separate MS-byte and LS-byte select controls. In
addition, all digital inputs are compatible with both TTL and
5V CMOS-logic levels. The MX7534/MX7535 are intended
for unipolar operation, but may be operated as bipolar
DACs with additional external components. Both devices
are protected against CMOS latchup, and neither requires
the use of external Schottky protection diodes.
The MX7534 is available in 20-pin narrow (0.3") DIP, wide
SO, or PLCC packages. The MX7535 is available in
28-pin, 600 mil wide DIP, wide SO, or PLCC packages.
________________________Applications
Machine and Motion Control Systems
Automatic Test Equipment
Digital Audio
µP-Controlled Calibration Circuitry
Programmable-Gain Amplifiers
Digitally Controlled Filters
Programmable Power Supplies
_________________Pin Configurations
____________________________Features
o 14-Bit Monotonic Over Full Temperature Range
o Full 4-Quadrant Multiplication
o µP-Compatible, Double-Buffered Inputs
o Exceptionally Low Gain Tempco (2.5ppm/°C)
o Low Output Leakage (<20nA) Over Temp.
o Low Power Consumption
o TTL and CMOS Compatible
______________Ordering Information
PART
TEMP. RANGE PIN-PACKAGE INL (LSBs)
MX7534KN
0°C to +70°C 20 Plastic DIP
±1
MX7534JN
0°C to +70°C 20 Plastic DIP
±2
MX7534KCWP 0°C to +70°C 20 SO
±1
MX7534JCWP 0°C to +70°C 20 SO
±2
MX7534KP
0°C to +70°C 20 PLCC
±1
MX7534JP
0°C to +70°C 20 PLCC
±2
MX7534J/D
0°C to +70°C Dice*
±2
MX7534BQ -25°C to +85°C 20 CERDIP
±1
MX7534AQ -25°C to +85°C 20 CERDIP
±2
MX7534BD -25°C to +85°C 20 Ceramic SB
±1
MX7534AD -25°C to +85°C 20 Ceramic SB
±2
MX7534KEWP -40°C to +85°C 20 SO
±1
MX7534JEWP -40°C to +85°C 20 SO
±2
MX7534TQ -55°C to +125°C 20 CERDIP
±1
MX7534SQ -55°C to +125°C 20 CERDIP
±2
MX7534TD -55°C to +125°C 20 Ceramic SB
±1
MX7534SD -55°C to +125°C 20 Ceramic SB
±2
Ordering Information continued at end of data sheet.
*Dice are tested at +25°C, DC parameters only.
_______________Functional Diagrams
TOP VIEW
REF 1
RFB 2
IOUT 3
AGNDS 4
AGNDF 5
DGND 6
D7 7
D6 8
D5 9
D4 10
MX7534
20 VSS
19 VDD
18 CS
17 WR
16 A0
15 A1
14 D0
13 D1
12 D2
11 D3
DIP/SO/PLCC/Ceramic SB
MX7535 at end of data sheet.
VDD
19
REF 1
14-BIT DAC
14
DAC REGISTER
6
MS
INPUT
REGISTER
8
LS
INPUT
REGISTER
CONTROL
LOGIC
MX7534
2
3
RFB
IOUT
4 AGNDS
5 AGNOF
15 A1
16 A0
18 CS
17 WR
7–14
D7–D0
6
DGND
Functional diagrams continued at end of data sheet.
20
VSS
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
1 page  
Microprocessor-Compatible,
14-Bit DACs
__________Pin Description (MX7534)
PIN NAME
FUNCTION
1 REF Reference Input to DAC
2
RFB
Feedback Resistor. Used to close the
loop around an external op amp.
3 IOUT Current Output
Analog Ground Sense. Reference
4 AGNDS point for external circuitry. AGNDS
should carry minimum current.
Analog Ground Force. Carries current
5
AGNDF
from internal analog ground connec-
tions. AGNDS and AGNDF are tied
together internally.
6 DGND Digital Ground
7 D7 Data Bit 7
8 D6 Data Bit 6
9 D5 Data Bit 5 or Data Bit 13 (MSB)
10 D4 Data Bit 4 or Data Bit 12
11 D3 Data Bit 3 or Data Bit 11
12 D2 Data Bit 2 or Data Bit 10
13 D1 Data Bit 1 or Data Bit 9
14 D0 Data Bit 0 (LSB) or Data Bit 8
15 A1 Address Input 1
16 A0 Address Input 0
17 WR Write Input. Active low.
18 CS Chip-Select Input. Active low.
19 VDD +12V to +15V Supply-Voltage Input
20
VSS
Bias pin for high-temperature,
low-leakage configuration
__________Pin Description (MX7535)
PIN NAME
FUNCTION
1 REFS Reference Voltage Sense
2 REFF Reference Voltage Force
3
RFB
Feedback Resistor. Used to close the
loop around an external op amp.
4 IOUT Current Output
Analog Ground Sense. Reference
5 AGNDS point for external circuitry. This pin
should carry minimum current.
Analog Ground Force. Carries current
6
AGNDF
from internal analog ground
connections. AGNDS and AGNDF
are tied together internally.
7 DGND Digital Ground
8 D13 Data Bit 13 (MSB)
9 D12 Data Bit 12
10 D11 Data Bit 11
11 D10 Data Bit 10
12 D9 Data Bit 9
13 D8 Data Bit 8
14 D7 Data Bit 7
15 D6 Data Bit 6
16 D5 Data Bit 5
17 D4 Data Bit 4
18 D3 Data Bit 3
19 D2 Data Bit 2
20 D1 Data Bit 1
21 D0 Data Bit 0 (LSB)
22
CSMSB
Chip-Select Most Significant Byte.
Active low.
23
LDAC
Asynchronous Load DAC Input.
Active low.
24
CSLSB
Chip-Select Least Significant Byte.
Active low.
25 WR Write Input. Active low.
26 VDD +12V to +15V Supply-Voltage Input
27
VSS
Bias pin for high-temperature,
low-leakage configuration
28 N.C. No Connection. Not internally connected.
_______________________________________________________________________________________ 5
5 Page 
Microprocessor-Compatible,
14-Bit DACs
VDD
A2
+ 2 1 26 3
REFF REFS VDD RFB
C1
33pF
4
IOUT
MX7535
AGNDS
AGNDF
D13–D0 DGND VSS 6
8–21 7 27
5
A1
+
RL V0
INPUT
DATA
OUTPUT
C1 LOCATION
V+ V-
PIN 1 AD544*
REF
VSS
VDD
PIN 1 MX7534
A3
+
NOTE: CONTROL INPUTS OMITTED FOR CLARITY.
Figure 7. Driving the MX7535 with a Remote Voltage Reference
medium-frequency applications, the OP27 is recom-
mended. For higher-frequency applications, the HA-
2620 is recommended. However, these op amps
require external offset adjustment (Table 5).
________Microprocessor Interfacing
8086 with MX7535
The MX7534/MX7535 interface to both 8-bit and 16-bit
processors. Figure 9a shows the 8086 16-bit processor
interfacing to a single MX7535. In this setup, the double-
buffering feature of the DAC is not used. AD0–AD13 of
the 16-bit data bus are connected to the DAC data bus
(D0–D13). The 14-bit word is written to the DAC in one
MOV instruction, and the analog output responds imme-
diately. In this example, the DAC address is D000. Table
6a shows a software routine for Figure 9a.
In a multiple DAC system, the double buffering of the
DAC chips allows the user to simultaneously update all
DACs. In Figure 10, a 14-bit word is loaded to each of
the DAC’s input registers in sequence. Then, with one
instruction to the appropriate address, CS4 (i.e., LDAC)
is brought low, updating all the DACs simultaneously.
8086 with MX7534
Figure 9b shows an interface circuit to a 16-bit micro-
processor. The bottom 8 bits (AD0–AD7) of the 16-bit
data bus are connected to the DAC data bus. The
AGND
DGND
NOTE:
LAYOUT IS FOR DOUBLE-SIDED
PCB. BOLD LINE INDICATES
TRACK ON COMPONENT SIDE.
*AD544 IS AN ANALOG DEVICES PART.
Figure 8. Suggested Layout for MX7534 Incorporating Output
Amplifier
14-bit word is loaded in two bytes, using the MOV
instruction. A further MOV loads the DAC register and
causes the analog data to appear at the converter out-
put. For the example given here, the appropriate DAC
register addresses are D002, D004, and D006. Table
6b shows the program for loading the DAC.
8085A with MX7534
A typical interface circuit is shown in Figure 9c. The
DAC is treated as four memory locations addressed by
A0 and A1. In standard operation, three of these memo-
ry locations are used. Table 6c shows a sample pro-
gram for loading the DAC with a 14-bit word. The
MX7534 has address locations 3000–3003.
The six MSBs are written into location 3001, and eight
LSBs are written to 3002. Then, with a write instruction to
3003, the full 14-bit word is loaded to the DAC register.
______________________________________________________________________________________ 11
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