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參數(shù)資料
| 型號： | MAX5534ETC+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 12BIT DUAL ULP 12-TQFN |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 設置時間： | 660µs |
| 位數(shù)： | 12 |
| 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 |
| 功率耗散（最大）： | 1.35mW |
| 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 |
| 供應商設備封裝： | 12-TQFN-EP（4x4） |
| 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）： | * |
MAX5532–MAX5535
Dual, Ultra-Low-Power,
12-Bit, Voltage-Output DACs
______________________________________________________________________________________
17
Power Modes
The MAX5532–MAX5535 feature two power modes to
conserve power during idle periods. In normal opera-
tion, the device is fully operational. In shutdown mode,
the device is completely powered down, including the
internal voltage reference in the MAX5533/MAX5535.
The MAX5533/MAX5535 also offer a standby mode in
which all circuitry is powered down except the internal
voltage reference. Standby mode keeps the reference
powered up while the remaining circuitry is shut down,
allowing it to be used as a system reference. It also
helps reduce the wake-up delay by not requiring the ref-
erence to power up when returning to normal operation.
Shutdown Mode
The MAX5532–MAX5535 feature a software-program-
mable shutdown mode that reduces the supply current
and the reference input current to 0.18A (max).
Writing an input control word with control bits C[3:0] =
1110 (Table 2) places the device in shutdown mode. In
shutdown, the MAX5532/MAX5534 reference input and
DAC output buffers go high impedance. Placing the
MAX5533/MAX5535 into shutdown turns off the internal
reference and the DAC output buffers go high imped-
ance. The serial interface still remains active for
all devices.
Table 2 shows several commands that bring the
MAX5532–MAX5535 back to normal operation. The
power-up time from shutdown is required before the
DAC outputs are valid.
Note: For the MAX5533/MAX5535, standby mode can-
not be entered directly from shutdown mode. The
device must be brought into normal operation first
before entering standby mode.
Standby Mode (MAX5533/MAX5535 Only)
The MAX5533/MAX5535 feature a software-program-
mable standby mode that reduces the typical supply
current to 3A (max). Standby mode powers down all
circuitry except the internal voltage reference. Place
the device in standby mode by writing an input control
word with control bits C[3:0] = 1100 (Table 2). The
internal reference and serial interface remain active
while the DAC output buffers go high impedance.
For the MAX5533/MAX5535, standby mode cannot be
entered directly from shutdown mode. The device must
be brought into normal operation first before entering
standby mode. To enter standby from shutdown, issue
the command to return to normal operation followed
immediately by the command to go into standby.
Table 2 shows several commands that bring the
MAX5533/MAX5535 back to normal operation. When
transitioning from standby mode to normal operation,
only the DAC power-up time is required before the DAC
outputs are valid.
Reference Input
The MAX5532/MAX5534 accept a reference with a volt-
age range extending from 0 to VDD. The output voltage
(VOUT) is represented by a digitally programmable volt-
age source as:
VOUT = (VREF x N / 4096) x gain
where N is the numeric value of the DAC’s binary input
code (0 to 4095), VREF is the reference voltage, gain is
the externally set voltage gain for the MAX5534, and
gain is one for the MAX5532.
In shutdown mode, the reference input enters a high-
impedance state with an input impedance of 2.5G
Ω (typ).
Reference Output
The MAX5533/MAX5535 internal voltage reference is soft-
ware configurable to one of four voltages. Upon power-
up, the default reference voltage is 1.214V. Configure the
reference voltage using D10 and D11 data bits (Table 3)
when the control bits are as follows C[3:0] = 1100, 1101,
or 1110 (Table 2). VDD must be kept at a minimum of
200mV above VREF for proper operation.
Table 3. Reference Output Voltage
Programming
D11
D10
REFERENCE VOLTAGE (V)
0
1.214
0
1
1.940
1
0
2.425
1
3.885
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