參數(shù)資料
型號： MAX5237
廠商： Maxim Integrated Products, Inc.
英文描述： Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs
中文描述： 單電源、3V/5V、電壓輸出、雙路、高精度10位DAC
文件頁數(shù)： 10/19頁
文件大?。?/td> 553K
代理商： MAX5237
M
Detailed Description
The MAX5236/MAX5237 10-bit, voltage-output DACs
are easily configured with a 3-wire SPI/
QSPI/MICROWIRE 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 register. In
addition, these devices employ precision trimmed inter-
nal resistors to produce a gain of 1.6384V/V, maximiz-
ing the output voltage swing, and a programmable
shutdown output impedance of 1k
or 200k
. The full-
scale output voltage is 4.092V for the MAX5237 and
2.046V for the MAX5236. These devices produce a
weighted output voltage proportional to the digital input
code with an inverted rail-to-rail ladder network (Figure 3).
External Reference
The reference inputs accept both AC and DC values
with a voltage range extending from 0.25V to 2.6V for
the MAX5237 and 0.25V to 1.5V for the MAX5236. For
proper operation
do not
exceed the input voltage
range limits. Determine the output voltage using the fol-
lowing equation:
V
OUT
_ = (V
REF
_ x NB / 1024) x 1.6384V/V
where NB is the numeric value of the DACs binary input
code (0 to 1023), V
REF
_ is the reference voltage, and
1.6384V/V is the gain of the internal output amplifier.
The code-dependent reference input impedance
ranges from a minimum of 28k
to several G
at code
0. The code-dependent reference input capacitance is
typically 23pF.
Output Amplifier
The output amplifiers have internal resistors that pro-
vide for a gain of 1.6384V/V. These trimmed resistors
minimize gain error. The output amplifiers have a typical
slew rate of 0.6V/μs and settle to 1/2LSB within 10μs
(typ) with a load of 5k
in parallel with 100pF. Use the
serial interface to set the shutdown output impedance
of the amplifiers to 1k
or 200k
.
Single-Supply 3V/5V, Voltage-Output, Dual,
Precision 10-Bit DACs
10
______________________________________________________________________________________
Pin Description
PIN
NAME
FUNCTION
1
OUTA
DAC A Output
2
3
4
5
6
7
REFA
GND
LDAC
CS
SCLK
DIN
Reference for DAC A
Ground
Load DACs A and B
Chip Select Input
Shift Register Serial Clock Input
Serial Data Input
8
V
DD
REFB
Positive Supply
9
Reference for DAC B
10
OUTB
DAC B Output
2
μ
s/div
MAX5237
MAJOR CARRY GLITCH
CS
2V/div
MAX5236/7 toc28
OUT_
50mV/div
AC-COUPLED
0
0.50
0.25
1.25
1.00
0.75
2.00
1.75
1.50
2.25
0
0.50
0.25
0.75
1.00
1.25
MAX5236
FULL-SCALE OUTPUT VOLTAGE
vs. REFERENCE VOLTAGE
M
V
REF
(V)
V
O
0
1.0
0.5
2.5
2.0
1.5
4.0
3.5
3.0
4.5
0
1.0
0.5
1.5
2.0
2.5
MAX5237
FULL-SCALE OUTPUT VOLTAGE
vs. REFERENCE VOLTAGE
M
V
REF
(V)
V
O
Typical Operating Characteristics (continued)
(V
DD
= +5V (MAX5237) V
DD
= +3V (MAX5236), R
L
= 5k
, C
L
= 100pF, V
REF
= +1.25V (MAX5236), V
REF
= +2.5V (MAX5237), C
REF
= 0.1μF ceramic || 2.2μF electrolytic, both DACs on, V
OUT
= full scale, T
A
= +25
°
C, unless otherwise noted.)
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