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參數(shù)資料
| 型號： | MAX1340BETX+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 11/39頁 |
| 文件大小： | 0K |
| 描述： | IC ADC/DAC 12BIT W/FIFO 36WQFN |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 類型： | ADC，DAC |
| 分辨率（位）： | 12 b |
| 采樣率（每秒）： | 225k |
| 數(shù)據(jù)接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 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： | 36-WFQFN 裸露焊盤 |
| 供應商設備封裝： | 36-TQFN 裸露焊盤（6x6） |
| 包裝： | 帶卷 (TR) |
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MAX1340/MAX1342/MAX1346/MAX1348
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
______________________________________________________________________________________
19
The GPIOs can sink and source current. The
MAX1342/MAX1348 GPIOA0 and GPIOA1 can sink and
source up to 15mA. GPIOC0 and GPIOC1 can sink 4mA
and source 2mA. See Table 3.
Clock Modes
Internal Clock
The MAX1340/MAX1342/MAX1346/MAX1348 can oper-
ate from an internal oscillator. The internal oscillator is
active in clock modes 00, 01, and 10. Figures 6, 7, and
8 show how to start an ADC conversion in the three
internally timed conversion modes.
Read out the data at clock speeds up to 25MHz
through the SPI interface.
External Clock
Set CKSEL1 and CKSEL0 in the setup register to 11 to
set up the interface for external clock mode 11. See
Table 5. Pulse SCLK at speeds from 0.1MHz to
3.6MHz. Write to SCLK with a 40% to 60% duty cycle.
The SCLK frequency controls the conversion timing.
See Figure 9 for clock mode 11 timing. See the
ADC
Conversions in Clock Mode 11 section.
ADC/DAC References
Address the reference through the setup register, bits 3
and 2. See Table 5. Following a wake-up delay, set
REFSEL[1:0] = 00 to program both the ADC and DAC
for internal reference use. Set REFSEL[1:0] = 10 to pro-
gram the ADC for internal reference use without a
wake-up delay. Set REFSEL[1:0] = 10 to program the
DAC for external reference, REF1. When using REF1 or
REF2/AIN_ in external reference, connect a 0.1F
capacitor to AGND. Set REFSEL[1:0] = 01 to program
the ADC and DAC for external-reference mode. The
DAC uses REF1 as its external reference, while the
ADC uses REF2 as its external reference. Set
REFSEL[1:0] = 11 to program the ADC for external dif-
ferential reference mode. REF1 is the positive reference
and REF2 is the negative reference in the ADC external
differential mode.
When REFSEL[1:0] = 00 or 10, REF2/AIN_ functions as
an analog input channel. When REFSEL[1:0] = 01 or 11,
REF2/AIN_ functions as the device’s negative reference.
Temperature Measurements
Issue a command byte setting bit 0 of the conversion
register to one to take a temperature measurement.
See Table 4. The MAX1340/MAX1342/MAX1346/
MAX1348 perform temperature measurements with an
internal diode-connected transistor. The diode bias cur-
rent changes from 68A to 4A to produce a tempera-
ture-dependent bias voltage difference. The second
conversion result at 4A is subtracted from the first at
68A to calculate a digital value that is proportional to
absolute temperature. The output data appearing at
DOUT is the digital code above, minus an offset to
adjust from Kelvin to Celsius.
The reference voltage used for the temperature mea-
surements is always derived from the internal reference
source to ensure that 1 LSB corresponds to 1/8 of a
degree Celsius. On every scan where a temperature
measurement is requested, the temperature conversion
is carried out first. The first 2 bytes of data read from
the FIFO contain the result of the temperature measure-
ment. If another temperature measurement is per-
formed before the first temperature result is read out,
the old measurement is overwritten by the new result.
Temperature results are in degrees Celsius (two’s com-
plement). See the
Applications Information section for
information on how to perform temperature measure-
ments in each clock mode.
Register Descriptions
The MAX1340/MAX1342/MAX1346/MAX1348 communi-
cate between the internal registers and the external cir-
cuitry through the SPI-compatible serial interface. Table
1 details the command byte, the registers, and the bit
names. Tables 4–12 show the various functions within
the conversion register, setup register, unipolar-mode
register, bipolar-mode register, ADC averaging regis-
ter, DAC select register, reset register, and GPIO com-
mand register, respectively.
Conversion Register
Select active analog input channels, scan modes, and a
single temperature measurement per scan by issuing a
command byte to the conversion register. Table 4
details channel selection, the four scan modes, and how
to request a temperature measurement. Start a scan by
writing to the conversion register when in clock mode 10
or 11, or by applying a low pulse to the
CNVST pin when
in clock mode 00 or 01. See Figures 6 and 7 for timing
specifications for starting a scan with
CNVST.
MAX1342/MAX1348
CURRENT
GPIOA0, GPIOA1
(mA)
GPIOC0, GPIOC1
(mA)
Sink
15
4
Source
15
2
Table 3. GPIO Maximum Sink/Source
Current
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