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參數(shù)資料
| 型號： | MAX5385EZT+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 13/15頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 8BIT 3WIRE SER TSOT23-6 |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 設(shè)置時(shí)間： | 20µs |
| 位數(shù)： | 8 |
| 數(shù)據(jù)接口： | 串行 |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-6 細(xì)型，TSOT-23-6 |
| 供應(yīng)商設(shè)備封裝： | TSOT-23-6 |
| 包裝： | 帶卷 (TR) |
| 輸出數(shù)目和類型： | 1 電壓，單極 |
| 采樣率（每秒）： | * |
Detailed Description
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.
Analog Section
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.
Output Voltage
Table 1 shows the relationship between the DAC code
and the analog output voltage. The 8-bit DAC code is
binary unipolar with 1LSB = (VREF/256). The MAX5383/
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 VDD -
1LSB).
Output Buffer
The DAC voltage output is an internally buffered unity-
gain follower that slews up to ±0.4V/s. 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 5s when loaded with 10k in par-
allel with 50pF. The buffer amplifiers are stable with any
MAX5383/MAX5384/MAX5385
Low-Cost, Low-Power, 8-Bit DACs with 3-Wire
Serial Interface in SOT23
_______________________________________________________________________________________
7
Typical Operating Characteristics (continued)
(VDD = +3.0V (MAX5383), VDD = +5.0V (MAX5384/MAX5385), TA = +25°C, unless otherwise noted.)
2s/div
MAX5383
OUTPUT SETTLING
1LSB STEP UP
MAX5383/4/5-22
OUT
20mV/div
AC-COUPLED
0 x 7F TO 0 x 80
CS
3V/div
MAX5383
OUTPUT SETTLING
1LSB STEP DOWN
MAX5383/4/5-23
OUT
20mV/div
AC-COUPLED
2s/div
0 x 80 TO 0 x 7F
CS
3V/div
Pin Description
PIN
NAME
DESCRIPTION
1
OUT
DAC Voltage Output
2
GND
Ground
3VDD
Power-Supply Input
4
DIN
Serial Data Input
5
SCLK
Serial Clock Input
6
CS
Chip-Select Input
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