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參數(shù)資料
| 型號： | MAX1258BETM+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 15/43頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC/DAC 12BIT 48-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 |
| 類型： | ADC，DAC |
| 分辨率（位）： | 12 b |
| 采樣率（每秒）： | 225k |
| 數(shù)據(jù)接口： | 串行 |
| 電壓電源： | 模擬和數(shù)字 |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 48-TQFN-EP（7x7） |
| 包裝： | 帶卷 (TR) |
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MAX1220/MAX1257/MAX1258
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
22
______________________________________________________________________________________
The first 2 bytes of data read out after a temperature
measurement always contain the 12-bit temperature
result, preceded by four leading zeros, MSB first. If
another temperature measurement is performed before
the first temperature result is read out, the old measure-
ment is overwritten by the new result. Temperature
results are in degrees Celsius (two’s complement), at a
resolution of 8 LSB per degree. See the
Temperature
Measurements section for details on converting the dig-
ital code to a temperature.
12-Bit DAC
In addition to the 12-bit ADC, the MAX1220/
MAX1257/MAX1258 also include eight voltage-output,
12-bit, monotonic DACs with less than 4 LSB integral
nonlinearity error and less than 1 LSB differential nonlin-
earity error. Each DAC has a 2s settling time and ultra-
low glitch energy (4nVs). The 12-bit DAC code is
unipolar binary with 1 LSB = VREF/4096.
DAC Digital Interface
Figure 1 shows the functional diagram of the MAX1257/
MAX1258. The shift register converts a serial 16-bit word
to parallel data for each input register operating with a
clock rate up to 25MHz. The SPI-compatible digital inter-
face to the shift register consists of CS, SCLK, DIN, and
DOUT. Serial data at DIN is loaded on the falling edge
of SCLK. Pull CS low to begin a write sequence. Begin a
write to the DAC by writing 0001XXXX as a command
byte. The last 4 bits of the DAC select register are don’t-
care bits. See Table 10. Write another 2 bytes to the
DAC interface register following the command byte to
select the appropriate DAC and the data to be written to
it. See Tables 20 and 21.
The eight double-buffered DACs include an input and a
DAC register. The input registers are directly connect-
ed to the shift register and hold the result of the most
recent write operation. The eight 12-bit DAC registers
hold the current output code for the respective DAC.
Data can be transferred from the input registers to the
DAC registers by pulling LDAC low or by writing the
appropriate DAC command sequence at DIN. See
Table 20. The outputs of the DACs are buffered through
eight rail-to-rail op amps.
The MAX1220/MAX1257/MAX1258 DAC output voltage
range is based on the internal reference or an external
reference. Write to the setup register (see Table 5) to
program the reference. If using an external voltage ref-
erence, bypass REF1 with a 0.1F capacitor to AGND.
The MAX1257 internal reference is 2.5V. The
MAX1220/MAX1258 internal reference is 4.096V. When
using an external reference on any of these devices,
the voltage range is 0.7V to VAVDD.
DAC Transfer Function
See Table 2 for various analog outputs from the DAC.
DAC Power-On Wake-Up Modes
The state of the RES_SEL input determines the wake-up
state of the DAC outputs. Connect RES_SEL to AVDD
or AGND upon power-up to be sure the DAC outputs
wake up to a known state. Connect RES_SEL to AGND
to wake up all DAC outputs at 000h. While RES_SEL is
low, the 100k
internal resistor pulls the DAC outputs to
AGND and the output buffers are powered down.
Connect RES_SEL to AVDD to wake up all DAC outputs
at FFFh. While RES_SEL is high, the 100k
pullup
resistor pulls the DAC outputs to VREF1 and the output
buffers are powered down.
DAC Power-Up Modes
See Table 21 for a description of the DAC power-up
and power-down modes.
GPIOs
In addition to the internal ADC and DAC, the
MAX1257/MAX1258 also provide 12 general-purpose
input/output channels, GPIOA0–GPIOA3, GPIOB0–
DAC CONTENTS
MSB
LSB
ANALOG OUTPUT
1111
1000
0000
0001
1000
0000
0111
0000
0001
0000
0
+
VREF
4095
4096
+
= +
V
REF
2048
4096
2
+
VREF
2047
4096
+
VREF
1
4096
+
VREF
2049
4096
Table 2. DAC Output Code Table
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1258EVC16 | 功能描述:ADC / DAC多通道 Evaluation Kit/Evaluation System for the MAX1057 MAX1058 MAX1257 MAX1258 RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40 |
| MAX1258EVKIT | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 Evaluation Kit/Evaluation System for the MAX1057 MAX1058 MAX1257 MAX1258 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| MAX1259C/D | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1259CPE | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1259CPE+ | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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