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参数资料
| 型号： | DC790A |
| 厂商： | Linear Technology |
| 文件页数： | 25/28页 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2439-1 |
| 软件下载： | QuikEval System |
| 设计资源： | DC790A Design File DC790A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 6.8 |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2439-1 |
| 已供物品： | 板 |
| 相关产品： | LTC2439-1CGN#PBF-ND - IC ADC 16BIT 16CH MCRPWR 28SSOP LTC2439-1IGN#PBF-ND - IC ADC 16BIT 16CH MCRPWR 28SSOP LTC2439-1CGN#TRPBF-ND - IC ADC 16BIT 16CH MCRPWR 28SSOP LTC2439-1IGN#TRPBF-ND - IC ADC 16BIT 16CH MCRPWR 28SSOP LTC2439-1CGN-ND - IC ADC 16BIT 16CH MCRPWR 28SSOP LTC2439-1IGN-ND - IC ADC 16BIT 16CH MCRPWR 28SSOP LTC2439-1IGN#TR-ND - IC ADC 16BIT 16CH MCRPWR 28SSOP LTC2439-1CGN#TR-ND - IC ADC 16BIT 16CH MCRPWR 28SSOP |
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LTC2439-1
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CH0 to CH15 (Pin 21 to Pin 28 and Pin 1 to Pin 8): Analog
Inputs. May be programmed for single-ended or differen-
tial mode.
VCC (Pin 9): Positive Supply Voltage. Bypass to GND
(Pin 15) with a 10
F tantalum capacitor in parallel with
0.1
F ceramic capacitor as close to the part as possible.
COM (Pin 10): The common negative input (IN–) for all
single-ended multiplexer configurations. The voltage on
Channel 0 to 15 and COM input pins can have any value
between GND – 0.3V and VCC + 0.3V. Within these limits,
the two selected inputs (IN+ and IN–) provide a bipolar
input range (VIN = IN+ – IN–) from – 0.5 VREF to 0.5 VREF.
Outside this input range, the converter produces unique
overrange and underrange output codes.
REF+ (Pin 11), REF– (Pin 12): Differential Reference
Input. The voltage on these pins can have any value
between GND and VCC as long as the positive reference
input, REF+, is maintained more positive than the negative
reference input, REF –, by at least 0.1V.
GND (Pin 15): Ground. Connect this pin to a ground plane
through a low impedance connection.
CS (Pin 16): Active LOW Digital Input. A LOW on this pin
enables the SDO digital output and wakes up the ADC.
Following each conversion the ADC automatically enters
the Sleep mode and remains in this low power state as
long as CS is HIGH. A LOW-to-HIGH transition on CS
during the Data Output transfer aborts the data transfer
and starts a new conversion.
SDO (Pin 17): Three-State Digital Output. During the Data
Output period, this pin is used as the serial data output.
When the chip select CS is HIGH (CS = VCC), the SDO pin
is in a high impedance state. During the Conversion and
Sleep periods, this pin is used as the conversion status
output. The conversion status can be observed by pulling
CS LOW.
SCK (Pin 18): Bidirectional Digital Clock Pin. In Internal
Serial Clock Operation mode, SCK is used as the digital
output for the internal serial interface clock during the Data
Output period. In External Serial Clock Operation mode,
SCK is used as the digital input for the external serial
interface clock during the Data Output period. A weak
internal pull-up is automatically activated in Internal Serial
Clock Operation mode. The Serial Clock Operation mode is
determined by the logic level applied to the SCK pin at
power up or during the most recent falling edge of CS.
FO (Pin 19): Frequency Control Pin. Digital input that
controls the ADC’s notch frequencies and conversion
time. When the FO pin is connected to GND (FO = 0V), the
converter uses its internal oscillator and rejects 50Hz and
60Hz simultaneously. When FO is driven by an external
clock signal with a frequency fEOSC, the converter uses this
signal as its system clock and the digital filter has 87dB
minimum rejection in the range fEOSC/2560 ±14% and
110dB minimum rejection at fEOSC/2560 ±4%.
SDI (Pin 20): Serial Digital Data Input. During the Data
Output period, this pin is used to shift in the multiplexer
address started from the first rising SCK edge. During the
Conversion and Sleep periods, this pin is in the DON’T
CARE state. However, a HIGH or LOW logic level should be
maintained on SDI in the DON’T CARE mode to avoid an
excessive current in the SDI input buffers.
NC (Pins 13, 14): Not Internally Connected. Do not con-
nect or connect to ground.
UU
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PI FU CTIO S
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