參數(shù)資料
型號(hào)： MAX1340BETX+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 21/39頁(yè)
文件大?。?/td> 0K
描述： IC ADC/DAC 12BIT W/FIFO 36WQFN
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： 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(pán)
供應(yīng)商設(shè)備封裝： 36-TQFN 裸露焊盤(pán)（6x6）
包裝： 帶卷 (TR)
MAX1340/MAX1342/MAX1346/MAX1348
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
28
______________________________________________________________________________________
Output-Data Format
Figures 6–9 illustrate the conversion timing for the
MAX1340/MAX1342/MAX1346/MAX1348. All 12-bit con-
version results are output in 2-byte format, MSB first,
with four leading zeros. Data appears on DOUT on the
falling edges of SCLK. Data is binary for unipolar mode
and two’s complement for bipolar mode and tempera-
ture results. See Figures 3, 4, and 5 for input/output and
temperature-transfer functions.
ADC Transfer Functions
Figure 3 shows the unipolar transfer function for single-
ended or differential inputs. Figure 4 shows the bipolar
transfer function for differential inputs. Code transitions
occur halfway between successive-integer LSB values.
Output coding is binary, with 1 LSB = VREF1 / 4096 for
unipolar and bipolar operation, and 1 LSB = +0.125°C
for temperature measurements. Bipolar true-differential
results and temperature-sensor results are available in
two’s complement format, while all others are in binary.
See Tables 6, 7, and 8 for details on which setting
(unipolar or bipolar) takes precedence.
In unipolar mode, AIN+ can exceed AIN- by up to
VREF1. In bipolar mode, either input can exceed the
other by up to VREF1/2.
Table 18. DAC Power-Up and Power-Down Commands
CONTROL
BITS
DATA BITS
C3 C2 C1 C0 X
X
DAC3
DAC2
DAC1
DAC0
D3 D2 D1 D0
DESCRIPTION
FUNCTION
1
X
———— 0
0
1
X
Power-Up
Power up individual DAC buffers indicated by data
in DAC0 through DAC3. A one indicates the DAC
output is connected and active. A zero does not
affect the DAC’s present state.
1
X
———— 0
1
0
X
Power-Down 1
Power down individual DAC buffers indicated by
data in DAC0 through DAC3. A one indicates the
DAC output is disconnected and high impedance.
A zero does not affect the DAC’s present state.
1
X
———— 1
0
X
Power-Down 2
Power down individual DAC buffers indicated by
data in DAC0 through DAC3. A one indicates the
DAC output is disconnected and pulled to AGND
with a 1k
resistor. A zero does not affect the DAC’s
present state.
1
X
———— 0
0
X
Power-Down 3
Power down individual DAC buffers indicated by
data in DAC0 through DAC3. A one indicates the
DAC output is disconnected and pulled to AGND
with a 100k
resistor. A zero does not affect the
DAC’s present state.
1
X
———— 1
1
X
Power-Down 4
Power down individual DAC buffers indicated by
data in DAC0 through DAC3. A one indicates the
DAC output is disconnected and pulled to REF1 with
a 100k
resistor. A zero does not affect the DAC’s
present state.
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