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參數(shù)資料
| 型號： | MAX5512EUA+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 10/23頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 8BIT DUAL VOUT 8-UMAX |
| 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)置時間： | 660µs |
| 位數(shù)： | 8 |
| 數(shù)據(jù)接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 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： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-uMAX |
| 包裝： | 帶卷 (TR) |
| 輸出數(shù)目和類型： | 2 電壓，單極；2 電壓，雙極 |
| 采樣率（每秒）： | * |
MAX5512–MAX5515
Voltage Biasing a
Current-Output Transducer
See the circuit in Figure 5 for an illustration of how to
configure the MAX5514/MAX5515 to bias a current-out-
put transducer. In Figure 5, the output voltage of the
MAX5514/MAX5515 is a function of the voltage drop
across the transducer added to the voltage drop
across the feedback resistor R.
Unipolar Output
Figure 6 shows the MAX5514 in a unipolar output con-
figuration with unity gain. Table 4 lists the unipolar out-
put codes.
Bipolar Output
The MAX5514 output can be configured for bipolar
operation as shown in Figure 7. The output voltage is
given by the following equation:
VOUT_ = VREFIN x [(NA - 128) / 128]
where NA represents the decimal value of the DAC’s
binary input code. Table 5 shows the digital codes (off-
set binary) and the corresponding output voltage for
the circuit in Figure 7.
Configurable Output Gain
The MAX5514/MAX5515 have force-sense outputs,
which provide a connection directly to the inverting ter-
minal of the output op amp, yielding the most flexibility.
The advantage of the force-sense output is that specific
gains can be set externally for a given application. The
gain error for the MAX5514/MAX5515 is specified in a
unity-gain configuration (op-amp output and inverting
terminals connected), and additional gain error results
from external resistor tolerances. Another advantage of
the force-sense DAC is that it allows many useful circuits
to be created with only a few simple external components.
An example of a custom fixed gain using the MAX5514/
MAX5515 force-sense output is shown in Figure 9. In
this example, R1 and R2 set the gain for VOUTA.
VOUTA = [(VREFIN x NA) / 256] x [1 + (R2 / R1)]
where NA represents the numeric value of the DAC
input code.
Dual, Ultra-Low-Power,
8-Bit, Voltage-Output DACs
18
______________________________________________________________________________________
Table 4. Unipolar Code Table (Gain = +1)
DAC CONTENTS
MSB
LSB
ANALOG OUTPUT
1111
0000
+VREF (255/256)
1000
0001
0000
+VREF (129/256)
1000
0000
+VREF (128/256) = +VREF/2
0111
1111
0000
+VREF (127/256)
0000
0001
0000
+VREF (1/256)
0000
0V
Table 5. Bipolar Code Table (Gain = +1)
DAC CONTENTS
MSB
LSB
ANALOG OUTPUT
1111
0000
+VREF (127/128)
1000
0001
0000
+VREF (1/128)
1000
0000
0V
0111
1111
0000
-VREF (1/128)
0000
0001
0000
-VREF (127/128)
0000
-VREF (128/128) = -VREF
NA IS THE DAC_ INPUT CODE
(0 TO 255 DECIMAL).
REFIN
MAX5514
OUT_
FB_
VOUT =
VREFIN × NA
256
DAC
Figure 6. Unipolar Output Circuit
REFIN
1/2 MAX5514
OUT_
VOUT
FB_
V+
10k
V-
DAC
Figure 7. Bipolar Output Circuit
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