MAX5156BEEE Просмотр технического описания (PDF) - Maxim Integrated
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MAX5156BEEE Datasheet PDF : 16 Pages
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Low-Power, Dual, 12-Bit Voltage-Output DACs
with Configurable Outputs
Digitally Programmable Current Source
Figure 15 depicts a digitally programmable, unidirec-
tional current source that can be used in industrial con-
trol applications. The output current is:
IOUT = (VREF / R) (NB / 4096)
where NB is the DAC code and R is the sense resistor.
Power-Supply Considerations
On power-up, the input and DAC registers clear (resets
to zero code). For rated performance, VREF_ should be
at least 1.4V below VDD. Bypass the power supply with
a 4.7µF capacitor in parallel with a 0.1µF capacitor to
GND. Minimize lead lengths to reduce lead inductance.
Grounding and Layout Considerations
Digital and AC transient signals on AGND can create
noise at the output. Connect AGND to the highest quali-
ty ground available. Use proper grounding techniques,
such as a multilayer board with a low-inductance
ground plane. Carefully lay out the traces between
channels to reduce AC cross-coupling and crosstalk.
Wire-wrapped boards and sockets are not recommend-
ed. If noise becomes an issue, shielding may be
required.
+5V/+3V REF_
VDD
DAC_
MAX5156
MAX5157
DGND
AGND
OUT_
FB_
VL
IOUT
2N3904
R
Figure 15. Digitally Programmable Current Source
__________________Pin Configuration
TOP VIEW
AGND 1
OUTA 2
FBA 3
REFA 4
CL 5
CS 6
DIN 7
SCLK 8
MAX5156
MAX5157
16 VDD
15 OUTB
14 FBB
13 REFB
12 PDL
11 UPO
10 DOUT
9 DGND
DIP/QSOP
___________________Chip Information
TRANSISTOR COUNT: 3053
SUBSTRATE CONNECTED TO AGND
_Ordering Information (continued)
PART
TEMP. RANGE
PIN-PACKAGE
INL
(LSB)
MAX5156AEPE
MAX5156BEPE
MAX5156AEEE
MAX5156BEEE
MAX5156BMJE
MAX5157ACPE
MAX5157BCPE
MAX5157ACEE
MAX5157BCEE
MAX5157AEPE
MAX5157BEPE
MAX5157AEEE
MAX5157BEEE
MAX5157BMJE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
16 Plastic DIP
16 Plastic DIP
16 QSOP
16 QSOP
16 CERDIP*
16 Plastic DIP
16 Plastic DIP
16 QSOP
16 QSOP
16 Plastic DIP
16 Plastic DIP
16 QSOP
16 QSOP
16 CERDIP*
±1/2
±1
±1/2
±1
±1
±1
±2
±1
±2
±1
±2
±1
±2
±2
*Contact factory for availability.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1997 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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