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參數(shù)資料
| 型號： | MAX520AEAP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | DAC |
| 英文描述： | Quad/Octal, 2-Wire Serial 8-Bit DACs with Rail-to-Rail Outputs |
| 中文描述： | SERIAL INPUT LOADING, 2 us SETTLING TIME, 8-BIT DAC, PDSO20 |
| 封裝： | SSOP-20 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 274K |
| 代理商： | MAX520AEAP |
M
Quad/Oc tal, 2-Wire S erial 8-Bit DACs
with Rail-to-Rail Outputs
14
______________________________________________________________________________________
Early Stop Conditions
The addressed device recognizes a STOP condition at
any point in a transmission. If the STOP occurs during a
command byte, all previous uninterrupted command
and output byte pairs are accepted, the interrupted
command byte is ignored, and the transmission ends
(Figure 13a). If the STOP occurs during an output byte,
all previous uninterrupted command and output byte
pairs are accepted, the final command byte
’
s PD and
RST bits are accepted, the interrupted output byte is
ignored, and the transmission ends (Figure 13b).
Analog S ec tion
DAC Operation
The MAX520 contains four matched voltage-output
DACs, and the MAX521 contains eight. The DACs are
inverted R-2R ladder networks that convert 8-bit digital
words into equivalent analog output voltages in propor-
tion to the applied reference voltages. For both
devices, DAC0–DAC3 each have separate reference
inputs, while the MAX521’s DAC4–DAC7 all share a
common reference input. Figure 14 shows a simplified
diagram of one DAC.
Reference Inputs
The MAX520/MAX521 can be used for multiplying appli-
cations. The reference accepts a 0V to V
DD
voltage,
both DC and AC signals. The voltage at each REF input
sets the full-scale output voltage for its respective
DAC(s). The reference voltage must be positive. The
DAC’s input impedance is code dependent, with the
lowest value occurring when the input code is 55 hex or
0101 0101, and the maximum value occurring when the
input code is 00 hex. Since the REF input resistance
( )
SET TOFULL SCALE
( )
( )
SDA
0
START
CONDITION
ADDRESS BYTE
(DEVICE 0)
ACK
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
0
1
0
0
1
REPEATED START
CONDITION
STOP
CONDITION
COMMAND BYTE
ADDRESSING DAC1
COMMAND BYTE
(ADDRESSING DAC2)
ACK
OUTPUT BYTE
(FULL SCALE)
ACK
ADDRESS BYTE
(DEVICE 1)
ACK
DEVICE 0's
DAC1 INPUT LATCH
DEVICE 1's
DAC2 INPUT LATCH
SET TOFULL SCALE
SDA
ACK
ACK
OUTPUT BYTE
(FULL SCALE)
SCALE. DEVICE 0's OUTPUT LATCHES UNCHANGED.
1
1
1
1
1
1
1
0
0
0
0
0
0
0 0
0
1
1
1
1
1
1
1
1
1
Figure 12. Repeated START Conditions
( )
SDA
0
0
START
CONDITION
ADDRESS BYTE
ACK
1
1
AD1 AD0 0
0
0 0
0
0 1 1
(RST) (PD)
(PD)
EARLY
STOP CONDITION
INTERRUPTED
COMMAND BYTE
MAX520/MAX521's STATES
REMAIN UNCHANGED
( )
SDA
0
START
CONDITION
ADDRESS BYTE
ACK
1
0
1
AD1 AD0 0 0 0
0
0
0
0
0
0
1
1 1
0
0
RST 1
COMMAND BYTE
(POWER DOWN)
ACK
INTERRUPTED
OUTPUT BYTE
(a)
(b)
MAX520/MAX521 POWER DOWN;
INPUT LATCHES UNCHANGED IF
RST = 0, DAC OUTPUTS RESET IF
RST = 1.
EARLY
STOP CONDITION
0 OR AD2
0 OR AD2
Figure 13. Early STOP Conditions
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PDF描述 |
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| MAX520AEPE | Quad/Octal, 2-Wire Serial 8-Bit DACs with Rail-to-Rail Outputs |
| MAX520AMJE | Quad/Octal, 2-Wire Serial 8-Bit DACs with Rail-to-Rail Outputs |
| MAX520BCAP | Quadruple Low-Power Drivers/Receivers 20-PDIP -40 to 85 |
| MAX520BEAP | Quad/Octal, 2-Wire Serial 8-Bit DACs with Rail-to-Rail Outputs |
| MAX520BEPE | Dual Differential Drivers and Receivers 16-SO -40 to 85 |
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| MAX520AEAP+T | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 8-Bit 4Ch Precision DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| MAX520AEAP-T | 功能描述:數(shù)模轉(zhuǎn)換器- DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| MAX520AEPE | 功能描述:數(shù)模轉(zhuǎn)換器- DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
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