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| 型号： | MAX1257BETM+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/43页 |
| 文件大小： | 0K |
| 描述： | IC ADC/DAC 12BIT 48-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | ADC，DAC |
| 分辨率（位）： | 12 b |
| 采样率（每秒）： | 225k |
| 数据接口： | 串行 |
| 电压电源： | 模拟和数字 |
| 电源电压： | 2.7 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（7x7） |
| 包装： | 带卷 (TR) |
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MAX1220/MAX1257/MAX1258
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
20
______________________________________________________________________________________
Table 1. Command Byte (MSB First)
REGISTER
NAME
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
ADDITIONAL
NO. OF
BYTES
Conversion
1
CHSEL3
CHSEL2
CHSEL1
CHSEL0
SCAN1
SCAN0
TEMP
0
Setup
0
1
CKSEL1
CKSEL0
REFSEL1
REFSEL0
DIFFSEL1
DIFFSEL0
1
ADC
0
1
AVGON
NAVG1
NAVG0
NSCAN1
NSCAN0
0
DAC Select
0
1
X
2
Reset
0
1
RESET
SLOW
FBGON
0
GPIO Configure
0
1
1 or 2
GPIO Write
0
1
0
1 or 2
GPIO Read
0
1
1 or 2
No Operation
0
X = Don’t care.
Write to the GPIOs by issuing a command byte to the
appropriate register. Writing to the MAX1220 GPIOs
requires 1 additional byte following the command byte.
Writing to the MAX1257/MAX1258 requires 2 additional
bytes following the command byte. See Tables 12–19
for details on GPIO configuration, writes, and reads.
See the
GPIO Command section. Command bytes writ-
ten to the GPIOs on devices without GPIOs are ignored.
Power-Up Default State
The MAX1220/MAX1257/MAX1258 power up with all
blocks in shutdown (including the reference). All regis-
ters power up in state 00000000, except for the setup
register and the DAC input register. The setup register
powers up at 0010 1000 with CKSEL1 = 1 and
REFSEL1 = 1. The DAC input register powers up to
FFFh when RES_SEL is high and powers up to 000h
when RES_SEL is low.
12-Bit ADC
The MAX1220/MAX1257/MAX1258 ADCs use a fully
differential successive-approximation register (SAR)
conversion technique and on-chip track-and-hold (T/H)
circuitry to convert temperature and voltage signals into
12-bit digital results. The analog inputs accept both sin-
gle-ended and differential input signals. Single-ended
signals are converted using a unipolar transfer function,
and differential signals are converted using a selec-
table bipolar or unipolar transfer function. See the
ADC
Transfer Functions section for more data.
ADC Clock Modes
When addressing the setup, register bits 5 and 4 of the
command byte (CKSEL1 and CKSEL0, respectively)
control the ADC clock modes. See Table 5. Choose
between four different clock modes for various ways to
start a conversion and determine whether the acquisi-
tions are internally or externally timed. Select clock
mode 00 to configure CNVST/AIN_ to act as a conver-
sion start and use it to request internally timed conver-
sions, without tying up the serial bus. In clock mode 01,
use CNVST to request conversions one channel at a
time, thereby controlling the sampling speed without
tying up the serial bus. Request and start internally
timed conversions through the serial interface by writ-
ing to the conversion register in the default clock mode,
10. Use clock mode 11 with SCLK up to 3.6MHz for
externally timed acquisitions to achieve sampling rates
up to 225ksps. Clock mode 11 disables scanning and
averaging. See Figures 6–9 for timing specifications on
how to begin a conversion.
These devices feature an active-low, end-of-conversion
output. EOC goes low when the ADC completes the last
requested operation and is waiting for the next com-
mand byte. EOC goes high when CS or CNVST go low.
EOC is always high in clock mode 11.
Single-Ended or Differential Conversions
The MAX1220/MAX1257/MAX1258 use a fully differen-
tial ADC for all conversions. When a pair of inputs are
connected as a differential pair, each input is connect-
ed to the ADC. When configured in single-ended mode,
the positive input is the single-ended channel and the
negative input is referred to AGND. See Figure 2.
In differential mode, the T/H samples the difference
between two analog inputs, eliminating common-mode
DC offsets and noise. IN+ and IN- are selected from the
following pairs: AIN0/AIN1, AIN2/AIN3, AIN4/AIN5,
AIN6/AIN7, AIN8/AIN9, AIN10/AIN11, AIN12/AIN13,
AIN14/AIN15. AIN0–AIN7 are available on all devices.
AIN0–AIN15 are available on the MAX1257/MAX1258.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1257EVKIT | 功能描述:数据转换 IC 开发工具 Programmers, Development Systems RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| MAX1258BETM | 功能描述:ADC / DAC多通道 RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
| MAX1258BETM+ | 功能描述:ADC / DAC多通道 12-Bit 16Ch 300ksps 5.5V Precision ADC RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
| MAX1258BETM+T | 功能描述:ADC / DAC多通道 12-Bit 16Ch 300ksps 5.5V Precision ADC RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
| MAX1258BETM-T | 功能描述:ADC / DAC多通道 RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
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