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參數資料
| 型號： | MAX5722AUA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | DAC |
| 英文描述： | 12-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface |
| 中文描述： | SERIAL INPUT LOADING, 4 us SETTLING TIME, 12-BIT DAC, PDSO8 |
| 封裝： | 5 X 3 MM, MO-187CAA, MICRO, SOP-8 |
| 文件頁數： | 10/14頁 |
| 文件大?。?/td> | 686K |
| 代理商： | MAX5722AUA |
M
12-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
10
______________________________________________________________________________________
keeping
CS
low during the first 15 SCLK cycles dis-
cards input data. The serial clock (SCLK) can idle
either high or low between transitions.
The MAX5722 has two internal registers per DAC, the
input register and the DAC register. The input register
holds the data that is waiting to be shifted to the DAC
register. Both input registers can be loaded without
updating the output. This function is useful when both
outputs need to be updated at the same time. The input
register can be made transparent. When the input reg-
ister is transparent, the data written into DIN loads
directly to the DAC register and the output is updated.
The DAC output is not updated until data is written to
the DAC register. See Table 2 for a list of serial-inter-
face programming commands.
Power-On Reset (POR)
The MAX5722 has an internal POR circuit. At power-up,
all DACs are powered-down and OUT_ is terminated to
GND through 100k
resistors. Contents of input and
DAC registers are cleared to all zero. An 8μs recovery
time after issuing a wake-up command is needed
before writing to the DAC registers. Power-down mode
control commands can be applied immediately with no
recovery time.
C3-C0 are control bits. The data bits D11 to D0 are in
straight binary format. All zeros correspond to zero
scale and all ones correspond to full scale.
Digital Inputs
The digital inputs are compatible with CMOS logic. In
order to save power and reduce input to output cou-
pling, SCLK and DIN input buffers are powered down
immediately after completion of shifting 16 bits into the
input shift register. A high to low transition at
CS
pow-
ers up SCLK and DIN input buffers.
Applications Information
Unipolar Output
The typical application circuit (Figure 3) shows the
MAX5722 configured for a unipolar output, where the
output voltages and the reference inputs have the
same polarity. Table 3 lists the unipolar output codes.
Bipolar Output
The MAX5722 can be configured for bipolar operation
using a dual supply op amp (Figure 4). The transfer
function for bipolar operation is:
where D is the decimal value of the DACs binary input
code. Table 4 shows digital codes (offset binary) and
corresponding output voltages for the circuit in Figure 4.
V
V
D
OUT
REF
=
2
4096
1
EXTENDED
CONTROL
DATA BITS
C3
1
1
1
1
C2
1
1
1
1
C1
1
1
1
1
C0
1
1
1
1
D11–D5
X
X
X
X
D4
0
0
0
0
D3
X
X
X
X
D2
0
0
0
0
D1
0
0
1
D0
0
1
0
1
DESCRIPTION
FUNCTION
DAC A
DAC A
DAC A
DAC A
DAC O/P, wake-up
Floating output
Output is terminated with 1k
Output is terminated with 100k
DAC O/P, wake-up
Floating output
Output is terminated with 1k
Output is terminated with 100k
DAC O/P, wake-up
Floating output
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
X
X
X
X
X
X
0
0
0
0
1
1
X
X
X
X
X
X
1
1
1
1
0
0
0
0
1
1
0
0
0
1
0
1
0
1
DAC B
DAC B
DAC B
DAC B
DAC A-B
DAC A-B
1
1
1
1
1
1
1
1
X
X
1
1
X
X
0
0
1
1
0
1
DAC A-B
DAC A-B
Output is terminated with 1k
Output is terminated with 100k
Table 1. Power-Down Mode Control
X = Don’t Care
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX5722AUA+ | 功能描述:數模轉換器- DAC 12-Bit 2Ch Precision DAC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| MAX5722AUA+T | 功能描述:數模轉換器- DAC 12-Bit 2Ch Precision DAC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| MAX5722AUA-T | 功能描述:數模轉換器- DAC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| MAX5722EUA | 功能描述:數模轉換器- DAC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| MAX5722EUA+ | 功能描述:數模轉換器- DAC 12-Bit 2Ch Precision DAC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
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