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參數(shù)資料
| 型號： | LTC2494IUHF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 16-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PQCC38 |
| 封裝： | 5 X 7 MM, PLASTIC, MO-220WKHD, QFN-38 |
| 文件頁數(shù)： | 2/36頁 |
| 文件大?。?/td> | 675K |
| 代理商： | LTC2494IUHF |
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LTC2494
0
2494fa
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
over-range and under-range 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
GND and VCC as long as the reference positive input,
REF+, remains more positive than the negative reference
input, REF–, by at least 0.1V. The differential voltage VREF
= (REF+ – REF–) sets the full-scale range (–0.5 VREF/Gain
to 0.5 VREF/Gain) for all input channels.
SDI (Pin 34): Serial Data Input. This pin is used to select
the gain, line frequency rejection mode, 1x or 2x speed
mode, temperature sensor, as well as the input channel.
The serial data input is applied under control of the serial
clock (SCk) during the data output/input operation. The
first conversion following a new input or mode change
is valid.
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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