參數(shù)資料
型號: LTC2494IUHF#TRPBF
廠商: Linear Technology
文件頁數(shù): 2/38頁
文件大小: 0K
描述: IC ADC 16BIT W/PGA 38-QFN
標準包裝: 2,500
位數(shù): 16
采樣率(每秒): 15
數(shù)據(jù)接口: MICROWIRE?,串行,SPI?
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 480µW
電壓電源: 單電源
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 38-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 38-QFN(5x7)
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 16 個單端,雙極;8 個差分,雙極
配用: DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494
LTC2494
0
2494fd
pin Functions
GND (Pins 1, 3, 4, 5, 6, 31, 32, 33): Ground. Multiple
groundpinsinternallyconnectedforoptimumgroundcur-
rent flow and VCC decoupling. Connect each one of these
pins to a common ground plane through a low impedance
connection. All eight pins must be connected to ground
for proper operation.
NC (Pin 2): No Connection. This pin can be left floating
or tied to GND.
COM (Pin 7): The Common Negative Input (IN) for All
Single-Ended Multiplexer Configurations. The voltage on
CH0 to CH15 and COM pins can have any value between
GND – 0.3V to 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/Gain to 0.5 VREF/Gain.
Outside this input range, the converter produces unique
overrange and underrange output codes.
CH0 to CH15 (Pins 8 to 23): Analog Inputs. May be pro-
grammed for single-ended or differential mode.
MUXOUTP (Pin 24): Positive Multiplexer Output. Used
to drive an external buffer/amplifier or can be shorted
directly to ADCINP.
ADCINP (Pin 25): Positive ADC Input. Tie to the output
of a buffer/amplifier driven by MUXOUTP or tie directly
to MUXOUTP.
ADCINN (Pin 26): Negative ADC Input. Tie to the output
of a buffer/amplifier driven by MUXOUTN or tie directly
to MUXOUTN.
MUXOUTN (Pin 27): Negative Multiplexer Output. Used
to drive an external buffer/amplifier or can be shorted
directly to ADCINN.
VCC(Pin28):PositiveSupplyVoltage.BypasstoGNDwith
a 10F tantalum capacitor in parallel with a 0.1F ceramic
capacitor as close to the part as possible.
REF+(Pin29),REF(Pin30):DifferentialReferenceInput.
The voltage on these pins can have any value between
GNDandVCCaslongasthereferencepositiveinput,REF+,
remains more positive than the negative reference input,
REF,byatleast0.1V.ThedifferentialvoltageVREF=(REF+
– REF) sets the full-scale range (–0.5 VREF/Gain to 0.5
VREF/Gain) for all input channels. When performing an
on-chip temperature measurement, the minimum value
of REF = 2V.
typical perForMance characteristics
PSRR vs Frequency at VCC
(2x Speed Mode)
PSRR vs Frequency at VCC
(2x Speed Mode)
FREQUENCY AT VCC (Hz)
0
–140
RREJECTION
(dB)
–120
–80
–60
–40
0
20
100
140
2494 G37
–100
–20
80
180
220
200
40 60
120
160
VCC = 4.1V DC ±1.4V
REF+ = 2.5V
REF= GND
IN+ = GND
IN= GND
fO = GND
TA = 25°C
FREQUENCY AT VCC (Hz)
30600
–60
–40
0
30750
2494 G38
–80
–100
30650
30700
30800
–120
–140
–20
REJECTION
(dB)
VCC = 4.1V DC ±0.7V
REF+ = 2.5V
REF= GND
IN+ = GND
IN= GND
fO = GND
TA = 25°C
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