max5230beeet Maxim Integrated Products, Inc., max5230beeet Datasheet - Page 11

• Manufacturer Part Number: max5230beeet
• Description: 3v/5v, 12-bit, Serial Voltage-output Dual Dacs With Internal Reference
• Manufacturer: Maxim Integrated Products, Inc.

The MAX5230/MAX5231 12-bit, voltage-output DACs
are easily configured with a 3-wire SPI-, QSPI-,
MICROWIRE-compatible serial interface. The devices
include a 16-bit data-in/data-out shift register and have
an input consisting of an input register and a DAC reg-
ister. In addition, these devices employ precision
trimmed internal resistors to produce a gain of
1.6384V/V, maximizing the output voltage swing, and a
programmable-shutdown output impedance of 1kΩ or
200kΩ The full-scale output voltage is 4.095V for the
MAX5231 and 2.0475V for the MAX5230. These
devices produce a weighted output voltage proportion-
al to the digital input code with an inverted Rail-to-Rail
ladder network (Figure 3).
The MAX5230/MAX5231 use an on-board precision
bandgap reference to generate an output voltage of
1.234V (MAX5230) or 2.465V (MAX5231). With a low
temperature coefficient of only 3ppm/°C, REF can
source up to 100µA and is stable for capacitive loads
less than 35pF.
The output amplifiers have internal resistors that pro-
vide for a gain of 1.6384V/V when OS_ is connected to
AGND. The output amplifiers have a typical slew rate of
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Figure 2. Detailed Serial Interface Timing
3V/5V, 12-Bit, Serial Voltage-Output Dual DACs
______________________________________________________________________________________
LDAC
DOUT
SCLK
DIN
CS
Detailed Description
Internal Reference
t
CSO
Output Amplifiers
t
DS
t
CSS
®
t
D01
t
CH
with Internal Reference
t
CSH
0.6V/µs and settle to 1/2LSB within 10µs with a load of
5kΩ in parallel with 100pF. Use the serial interface to
set the shutdown output impedance of the amplifiers to
1kΩ or 200kΩ.
OS_ can be used to produce an offset voltage at the
output. For instance, to achieve a 1V offset, apply -1V
to OS_ to produce an output range from 1V to (1V +
V
ited by the maximum output voltage specification.
Figure 3. Simplified DAC Circuit Diagram
FS
SHOWN FOR ALL ONES ON DAC
AGND
t
REF
CP
/V
t
REF
LDL
t
D02
2R
t
CL
). Note that the DAC’s output range is still lim-
D0
2R
R
t
CSLD
t
CS1
t
DH
D9
2R
t
CSW
R
2R
D10
R
D11
2R
121kΩ
77.25kΩ
1kΩ
OS_
OUT_
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