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參數(shù)資料
| 型號(hào)： | DC745A |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 10/28頁(yè) |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2433-1 |
| 軟件下載： | QuikEval System |
| 設(shè)計(jì)資源： | DC745A Design File DC745A Schematic |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | QuikEval™ |
| ADC 的數(shù)量： | 2 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 6.8 |
| 數(shù)據(jù)接口： | MICROWIRE?，串行，SPI? |
| 工作溫度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2433-1 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | LTC2433-1IMS#PBF-ND - IC ADC DIFF 16BIT 3WIRE 10-MSOP LTC2433-1CMS#TRPBF-ND - IC ADC DIFF 16BIT 3WIRE 10-MSOP LTC2433-1IMS#TRPBF-ND - IC ADC DIFF 16BIT 3WIRE 10-MSOP LTC2433-1CMS#PBF-ND - IC ADC DIFF 16BIT 3WIRE 10-MSOP LTC2433-1IMS#TR-ND - IC CONV A/D 16BIT DIFF 10-MSOP LTC2433-1CMS#TR-ND - IC CONV A/D 16BIT DIFF 10-MSOP LTC2433-1IMS-ND - IC CONV A/D 16BIT DIFF 10-MSOP LTC2433-1CMS-ND - IC ADC DIFF 16BIT 3WIRE 10-MSOP |
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LTC2433-1
18
24331fa
During the conversion, the SCK and the serial data output
pin (SDO) are HIGH (EOC = 1). Once the conversion is
complete, SCK and SDO go LOW (EOC = 0) indicating the
conversion has finished and the device has entered the
data output state. The data output cycle begins on the
first rising edge of SCK and ends after the 19th rising
edge. Data is shifted out the SDO pin on each falling edge
of SCK. The internally generated serial clock is output
to the SCK pin. This signal may be used to shift the
conversion result into external circuitry. EOC can be
latched on the first rising edge of SCK and the last bit of
the conversion result can be latched on the 19th rising
edge of SCK. After the 19th rising edge, SDO goes HIGH
(EOC = 1) indicating a new conversion is in progress. SCK
remains HIGH during the conversion.
PRESERVING THE CONVERTER ACCURACY
The LTC2433-1 is designed to reduce as much as possible
the conversion result sensitivity to device decoupling,
PCB layout, antialiasing circuits, line frequency perturba-
tions and so on. Nevertheless, in order to preserve the
accuracy capability of this part, some simple precautions
are desirable.
Digital Signal Levels
The LTC2433-1’s digital interface is easy to use. Its digital
inputs (FO, CS and SCK in External SCK mode of operation)
accept standard TTL/CMOS logic levels and the internal
hysteresis receivers can tolerate edge rates as slow as
100
s.However,someconsiderationsarerequiredtotake
advantage of the exceptional accuracy and low supply
current of this converter.
The digital output signals (SDO and SCK in Internal SCK
mode of operation) are less of a concern because they are
not generally active during the conversion state.
While a digital input signal is in the range 0.5V to
(VCC – 0.5V), the CMOS input receiver draws additional
current from the power supply. It should be noted that,
when any one of the digital input signals (FO, CS and SCK
in External SCK mode of operation) is within this range, the
LTC2433-1 power supply current may increase even if the
signal in question is at a valid logic level. For micropower
operation, it is recommended to drive all digital input
signals to full CMOS levels [VIL < 0.4V and VOH >
(VCC – 0.4V)].
Figure 11. Internal Serial Clock, Continuous Operation
SDO
SCK
(INTERNAL)
CS
LSB
MSB
SIG
“O”
BIT 2
BIT 1
BIT 0
BIT 14
BIT 13
BIT 15
BIT 16
BIT 17
EOC
BIT 18
DATA OUTPUT
CONVERSION
24331 F11
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/SIMULTANEOUS
50Hz/60Hz REJECTION
VCC
FO
REF+
REF–
SCK
IN+
IN–
SDO
GND
CS
110
2
3
9
4
5
8
6
7
REFERENCE
VOLTAGE
0.1V TO VCC
ANALOG INPUT RANGE
–0.5VREF TO 0.5VREF
1
F
2.7V TO 5.5V
LTC2433-1
3-WIRE
SPI INTERFACE
APPLICATIO S I FOR ATIO
WU
UU
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