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參數(shù)資料
| 型號(hào)： | MAX1258BETM+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 10/43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
18
______________________________________________________________________________________
Detailed Description
The MAX1220/MAX1257/MAX1258 integrate a 12-bit,
multichannel, analog-to-digital converter (ADC), and a
12-bit, octal, digital-to-analog converter (DAC) in a sin-
gle IC. These devices also include a temperature sen-
sor
and
configurable
GPIOs
with
a
25MHz
SPI-/QSPI-/MICROWIRE-compatible serial interface.
The ADC is available in 8 and 16 input-channel
versions. The octal DAC outputs settle within 2.0s, and
the ADC has a 225ksps conversion rate.
All devices include an internal reference (2.5V or
4.096V) providing a well-regulated, low-noise reference
for both the ADC and DAC. Programmable reference
modes for the ADC and DAC allow the use of an inter-
nal reference, an external reference, or a combination
of both. Features such as an internal ±1°C accurate
temperature sensor, FIFO, scan modes, programmable
internal or external clock modes, data averaging, and
AutoShutdown allow users to minimize both power con-
sumption and processor requirements. The low glitch
energy (4nVs) and low digital feedthrough (0.5nVs) of
the integrated octal DACs make these devices ideal for
digital control of fast-response closed-loop systems.
These devices are guaranteed to operate with a supply
voltage from +2.7V to +3.6V (MAX1257) and from
+4.75V to +5.25V (MAX1220/MAX1258). These devices
consume 2.5mA at 225ksps throughput, only 22A at
1ksps throughput, and under 0.2A in the shutdown
mode. The MAX1257/MAX1258 feature 12 GPIOs while
the MAX1220 offers four GPIOs that can be configured
as inputs or outputs.
Figure 1 shows the MAX1257/MAX1258 functional dia-
gram. The MAX1220 only includes the GPIOA0,
GPIOA1 and GPIOC0, GPIOC1 block. The output-con-
ditioning circuitry takes the internal parallel data bus
and converts it to a serial data format at DOUT, with the
appropriate wake-up timing. The arithmetic logic unit
(ALU) performs the averaging function.
SPI-Compatible Serial Interface
The MAX1220/MAX1257/MAX1258 feature a serial inter-
face that is compatible with SPI and MICROWIRE
devices. For SPI, ensure the SPI bus master (typically a
microcontroller (C)) runs in master mode so that it
generates the serial clock signal. Select the SCLK fre-
quency of 25MHz or less, and set the clock polarity
(CPOL) and phase (CPHA) in the C control registers to
the same value. The MAX1220/MAX1257/MAX1258
operate with SCLK idling high or low, and thus operate
with CPOL = CPHA = 0 or CPOL = CPHA = 1. Set CS
low to latch any input data at DIN on the falling edge of
SCLK. Output data at DOUT is updated on the falling
edge of SCLK in clock modes 00, 01, and 10. Output
data at DOUT is updated on the rising edge of SCLK in
clock mode 11. See Figures 6–11. Bipolar true-differen-
tial results and temperature-sensor results are available
in two’s complement format, while all other results are in
binary.
A high-to-low transition on CS initiates the data-input
operation. Serial communications to the ADC always
begin with an 8-bit command byte (MSB first) loaded
from DIN. The command byte and the subsequent data
bytes are clocked from DIN into the serial interface on
the falling edge of SCLK. The serial-interface and fast-
interface circuitry is common to the ADC, DAC, and
GPIO sections. The content of the command byte
determines whether the SPI port should expect 8, 16, or
24 bits and whether the data is intended for the ADC,
DAC, or GPIOs (if applicable). See Table 1. Driving CS
high resets the serial interface.
The conversion register controls ADC channel selec-
tion, ADC scan mode, and temperature-measurement
requests. See Table 4 for information on writing to the
conversion register. The setup register controls the
clock mode, reference, and unipolar/bipolar ADC con-
figuration. Use a second byte, following the first, to
write to the unipolar-mode or bipolar-mode registers.
See Table 5 for details of the setup register and see
Tables 6, 7, and 8 for setting the unipolar- and bipolar-
mode registers. Hold CS low between the command
byte and the second and third byte. The ADC averag-
ing register is specific to the ADC. See Table 9 to
address that register. Table 11 shows the details of the
reset register.
Begin a write to the DAC by writing 0001XXXX as a
command byte. The last 4 bits of this command byte
are don’t-care bits. Write another 2 bytes (holding CS
low) to the DAC interface register following the com-
mand byte to select the appropriate DAC and the data
to be written to it. See the
DAC Serial Interface section
and Tables 10, 20, and 21.
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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(píng)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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