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MAX5171BEEE+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
Daisy-Chaining Devices
The serial data output pin (DOUT) allows multiple
MAX5171/MAX5173s to be daisy-chained together, as
shown in Figure 8. The advantage of this is that only
two lines are needed to control all of the DACs on the
line. The disadvantage is that it takes
n
commands to
program the DACs. Figure 9 shows several MAX5171/
MAX5173s sharing one common DIN signal line. In this
configuration, the data bus is common to all devices.
However, this configuration uses more I/O lines
because each device requires a dedicated CS line.
The benefit is that only one command is needed to pro-
gram any DAC.
Using an AC Reference
The MAX5171/MAX5173 accepts reference voltages
with AC components as long as the reference voltage
remains between 0 and V
DD
- 1.4V. Figure 10 shows a
technique for applying a sine-wave signal to the REF.
The reference voltage must remain above AGND.
Digitally Programmable Current Source
The circuit of Figure 11 places an NPN transistor
(2N3904 or similar) within the op amp feedback loop to
implement a digitally programmable, unidirectional cur-
rent source. The output current is calculated with the
following equation:
where N is the numeric value of the DAC’s binary input
code and R is the sense resistor shown in Figure 11.
I
VN
R
OUT
REF
=
⋅
⋅
16384
MAX5171/MAX5173
Low-Power, Serial, 14-Bit DACs
with Force/Sense Voltage Output
______________________________________________________________________________________ 13
DAC CONTENTS
MSB LSB
11 1111 1111 1111
10 0000 0000 0001
2 · V
REF
(8193/16384)
2 · V
REF
(16383/16384)
ANALOG OUTPUT
10 0000 0000 0000
2 · V
REF
(8192/16384)
01 1111 1111 1111
2 · V
REF
(8191/16384)
00 0000 0000 0001
2 · V
REF
(1/16384)
00 0000 0000 0000 0
DAC
V
OUT
V+
V-
+5V/+3.3V
REF
10k
10k
FB
OUT
V
DD
GND
MAX5171
MAX5173
Figure 7. Bipolar Output Circuit
Table 2. Unipolar Code Table
(Circuit of Figure 6)
Table 3. Bipolar Code Table
(Circuit of Figure 7)
MAX5171
MAX5173
DAC
REF
OUT
10k
10k
GND
+5V/+3.3V
V
DD
FB
Figure 6. Unipolar Output Circuit (Rail-to-Rail)
DAC CONTENTS
MSB LSB
11 1111 1111 1111
10 0000 0000 0001
+V
REF
[(2 · 8193/16384) - 1]
+V
REF
[(2 · 16383/16384) - 1]
ANALOG OUTPUT
01 1111 1111 1111
+V
REF
[(2 · 8191/16384) - 1]
00 0000 0000 0001
+V
REF
[(2 · 1/16384) - 1]
10 0000 0000 0000
+V
REF
[(2 · 8192/16384) - 1]
00 0000 0000 0000 -V
REF
MAX5171/MAX5173
Low-Power, Serial, 14-Bit DACs
with Force/Sense Voltage Output
14 ______________________________________________________________________________________
Power-Supply and Layout Considerations
Wire-wrap boards are not recommended. For optimum
system performance, use PC boards with separate
analog and digital ground planes. Connect the two
ground planes together at the low-impedance power-
supply source. Connect the DGND and AGND pins
together at the IC. The best ground connection is
achieved by connecting the DAC’s DGND and AGND
pins together and connecting that point to the system
analog ground plane. If the DAC’s DGND is connected
to the system digital ground, digital noise may get
through to the DAC’s analog portion.
Bypass the power supply with a 4.7µF capacitor in par-
allel with a 0.1µF capacitor to AGND. Minimize the
capacitor lead lengths to reduce inductance. If noise
becomes an issue, use shielding and/or ferrite beads to
increase isolation.
To maintain INL and DNL performance, as well as gain
drift, it is extremely important to provide the lowest pos-
sible reference output impedance at the DAC reference
input pin. INL degrades if the series resistance on the
REF pin exceeds 0.1Ω. The same consideration must
be made for the AGND pin.
TO OTHER
SERIAL DEVICES
MAX5171
MAX5173
DIN
SCLK
CS
MAX5171
MAX5173
DIN
SCLK
CS
MAX5171
MAX5173
DIN
SCLK
CS
DIN
SCLK
CS1
CS2
CS3
Figure 9. Multiple MAX5171/MAX5173s Sharing Common DIN and SCLK Lines
TO OTHER
SERIAL DEVICES
MAX5171
MAX5173
DIN
SCLK
CS
MAX5171
MAX5173
MAX5171
MAX5173
DINDOUT DOUT DOUT
SCLK
CS
DIN
SCLK
CS
Figure 8. Daisy-Chaining MAX5171/MAX5173 Devices
MAX5171/MAX5173
Low-Power, Serial, 14-Bit DACs
with Force/Sense Voltage Output
______________________________________________________________________________________ 15
Figure 10. AC Reference Input Circuit
DAC
OUT
MAX5171
MAX5173
R
2
R
1
OS
REF
V
DD
GND
+5V/
+3V
AC
REFERENCE
INPUT
500mVp-p
MAX495
+5V/+3V
Figure 11. Digitally Programmable Current Source
DAC
MAX5171
MAX5173
REF
OUT
R
I
OUT
2N3904
V
L
FB
+5V/+3.3V
V
DD
GND
SHDN
PDL
RS
CLR
SCLKDINCS
MAX5171
MAX5173
SERIAL
CONTROL
16-BIT
SHIFT REGISTER
DECODE
CONTROL
LOGIC
OUTPUT
INPUT
REGISTER
DAC
REGISTER
DAC
DOUT
UPO
FB
OUT
REF
DGNDAGND
V
DD
Functional Diagram
Chip Information
TRANSISTOR COUNT: 3457
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX5171BEEE+T

Mfr. #:
Buy MAX5171BEEE+T
Manufacturer:
Maxim Integrated
Description:
Digital to Analog Converters - DAC 14-Bit Precision DAC
Lifecycle:
New from this manufacturer.
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