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參數(shù)資料
| 型號： | MAX5521ETC+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 10BIT SGL ULP 12-TQFN |
| 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： | 660µs |
| 位數(shù)： | 10 |
| 數(shù)據(jù)接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 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： | 12-WQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 12-TQFN-EP（4x4） |
| 包裝： | 帶卷 (TR) |
| 輸出數(shù)目和類型： | 1 電壓，單極；1 電壓，雙極 |
| 采樣率（每秒）： | * |
MAX5520/MAX5521
+1.8V to +5.5V, Ultra-Low-Power, 10-Bit,
Voltage-Output DACs
16
______________________________________________________________________________________
Applications Information
1-Cell and 2-Cell Circuit
See Figure 3 for an illustration of how to power the
MAX5520/MAX5521 with either one lithium-ion battery
or two alkaline batteries. The low current consumption
of the devices makes the MAX5520/MAX5521 ideal for
battery-powered applications.
Programmable Current Source
See the circuit in Figure 4 for an illustration of how to
configure the MAX5520 as a programmable current
source for driving an LED. The MAX5520 drives a stan-
dard NPN transistor to program the current source. The
current source (ILED) is defined in the equation in
Figure 4.
Voltage Biasing a Current-Output
Transducer
See the circuit in Figure 5 for an illustration of how to con-
figure the MAX5520 to bias a current-output transducer.
In Figure 5, the output voltage of the MAX5520 is a func-
tion of the voltage drop across the transducer added to
the voltage drop across the feedback resistor R.
Self-Biased Two-Electrode
Potentiostat Application
See the circuit in Figure 6 for an illustration of how to
use the MAX5520 to bias a two-electrode potentiostat
on the input of an ADC.
Unipolar Output
Figure 7 shows the MAX5520 in a unipolar output con-
figuration with unity gain. Table 4 lists the unipolar out-
put codes.
Bipolar Output
The MAX5520 output can be configured for bipolar
operation, as shown in Figure 8. The output voltage is
given by the following equation:
VOUT = VREF x [(NA - 512) / 512]
where NA represents the numeric value of the DAC’s
binary input code. Table 5 shows digital codes (offset
binary) and the corresponding output voltage for the
circuit in Figure 4.
Configurable Output Gain
The MAX5520/MAX5521 have a force-sense output,
which provides 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 MAX5520/MAX5521 is specified in a
unity-gain configuration (op-amp output and inverting ter-
minals 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 force-sense
output of the MAX5520/MAX5521 is shown in Figure 9. In
this example R1 and R2 set the gain for VOUT.
VOUT = [(VREFIN x NA) / 1024] x [1 + (R2 / R1)]
where NA represents the numeric value of the DAC
input code.
REFIN
MAX5520
MAX6006
(1A, 1.25V
SHUNT
REFERENCE)
GND
+1.25V
0.01F
536k
VDD
DAC
VOUT
NDAC IS THE NUMERIC VALUE
OF THE DAC INPUT CODE.
VOUT (1.22mV / LSB)
1.8V ≤ VALKALINE ≤ 3.3V
2.2V ≤ VLITHIUM ≤ 3.3V
VOUT =
VREFIN × NDAC
1024
0.1F
Figure 3. Portable Application Using Two Alkaline Cells or One Lithium Coin Cell
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