max5383eztt Maxim Integrated Products, Inc., max5383eztt Datasheet - Page 7

• Manufacturer Part Number: max5383eztt
• Description: Low-cost, Low-power, 8-bit Dacs With 3-wire Serial Interface In Sot23
• Manufacturer: Maxim Integrated Products, Inc.

The MAX5383/MAX5384/MAX5385 voltage-output, 8-bit
DACs ensure monotonic performance by offering full 8-
bit performance with less than 1LSB integral nonlineari-
ty error and less than 1LSB differential nonlinearity
error. The devices use a simple 3-wire, SPI/QSPI/
MICROWIRE-compatible serial interface that operates
up to 10MHz. They include an internal reference, an
output buffer, and three low-current shutdown modes,
making these devices ideal for low-power, highly inte-
grated applications. Figure 1 shows the devices’ func-
tional diagram.
(V
DD
PIN
1
2
3
4
5
6
= +3.0V (MAX5383), V
Low-Cost, Low-Power, 8-Bit DACs with 3-Wire
AC-COUPLED
NAME
SCLK
20mV/div
GND
OUT
V
DIN
CS
3V/div
DD
OUT
CS
_______________________________________________________________________________________
0 x 7F TO 0 x 80
DAC Voltage Output
Ground
Power-Supply Input
Serial Data Input
Serial Clock Input
Chip-Select Input
Detailed Description
DD
OUTPUT SETTLING
= +5.0V (MAX5384/MAX5385), T
1LSB STEP UP
MAX5383
DESCRIPTION
2µs/div
Pin Description
Typical Operating Characteristics (continued)
Serial Interface in SOT23
A
= +25°C, unless otherwise noted.)
AC-COUPLED
The MAX5383/MAX5384/MAX5385 employ a current-
steering DAC topology as shown in Figure 2. At the
core of the DAC is a reference voltage-to-current con-
verter (V/I) that generates a reference current. This cur-
rent is mirrored to 255 equally weighted current
sources. DAC switches control the outputs of these cur-
rent mirrors so that only the desired fraction of the total
current-mirror currents is steered to the DAC output.
The current is then converted to a voltage across a
resistor, and this voltage is buffered by the output
buffer amplifier.
Table 1 shows the relationship between the DAC code
and the analog output voltage. The 8-bit DAC code is
binary unipolar with 1LSB = (V
MAX5384 have a full-scale output voltage of (+2V - 1LSB)
and (+4V - 1LSB), set by the internal references. The
MAX5385 has a full-scale output voltage of (0.9
1LSB).
The DAC voltage output is an internally buffered unity-
gain follower that slews up to ±0.4V/µs. The output can
swing from 0 to full scale. With a 1/4FS to 3/4FS output
transition, the amplifier outputs typically settle to
1/2LSB in less than 5µs when loaded with 10kΩ in par-
allel with 50pF. The buffer amplifiers are stable with any
20mV/div
3V/div
OUT
CS
0 x 80 TO 0 x 7F
OUTPUT SETTLING
1LSB STEP DOWN
MAX5383
2µs/div
REF
/256). The MAX5383/
Analog Section
Output Voltage
Output Buffer
✕
V
DD
7
-