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參數(shù)資料
| 型號： | LTC2408 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 18-Bit Universal Bus Driver With 3-State Outputs 56-TVSOP -40 to 85 |
| 中文描述： | 4-/8-Channel 24位ADC的無延遲uPower |
| 文件頁數(shù)： | 12/36頁 |
| 文件大小： | 351K |
| 代理商： | LTC2408 |
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12
LTC2404/LTC2408
APPLICATIO
S I
N
FOR
ATIO
U
Ease of Use
The LTC2404/LTC2408 data output has no latency, filter
settling or redundant data associated with the conversion
cycle. There is a one-to-one correspondence between the
conversion and the output data. Therefore, multiplexing
an analog input voltage is easy.
The LTC2404/LTC2408 perform offset and full-scale cali-
brations every conversion cycle. This calibration is trans-
parent to the user and has no effect on the cyclic operation
described above. The advantage of continuous calibration
is extreme stability of offset and full-scale readings with
respect to time, supply voltage change and temperature
drift.
W
U
Figure 2. LTC2404/LTC2408 Input Range
24048 F02
V
CC
+ 0.3V
9/8V
REF
V
REF
1/2V
REF
–0.3V
–1/8V
REF
0
NORMAL
INPUT
RANGE
EXTENDED
INPUT
RANGE
ABSOLUTE
MAXIMUM
INPUT
RANGE
Power-Up Sequence
The LTC2404/LTC2408 automatically enter an internal
reset state when the power supply voltage V
CC
drops
below approximately 2.2V. When the V
CC
voltage rises
above this critical threshold, the converter creates an
internal power-on-reset (POR) signal with duration of
approximately 0.5ms. The POR signal clears all internal
registers within the ADC and initiates a conversion. At
power-up, the multiplexer channel is disabled and should
be programmed once the device enters the sleep state.
The results of the first conversion following a POR are not
valid since a multiplexer channel was disabled.
Reference Voltage Range
The LTC2404/LTC2408 can accept a reference voltage
from 0V to V
CC
. The converter output noise is determined
by the thermal noise of the front-end circuits, and as such,
its value in microvolts is nearly constant with reference
voltage. A decrease in reference voltage will not signifi-
cantly improve the converter’s effective resolution. On the
other hand, a reduced reference voltage will improve the
overall converter INL performance. The recommended
range for the LTC2404/LTC2408 voltage reference is
100mV to V
CC
.
Input Voltage Range
The converter is able to accommodate system level offset
and gain errors as well as system level overrange
situations due to its extended input range, see Figure 2.
The LTC2404/LTC2408 converts input signals within the
extended input range of –0.125 V
REF
to 1.125 V
REF
.
For large values of V
REF
this range is limited to a voltage
range of –0.3V to (V
CC
+ 0.3V). Beyond this range the input
ESD protection devices begin to turn on and the errors due
to the input leakage current increase rapidly.
Input signals applied to V
IN
may extend below ground by
–300mV and above V
CC
by 300mV. In order to limit any fault
current, a resistor of up to 5k may be added in series with
any channel input pin (CH0 to CH7) without affecting the
performance of the device. In the physical layout, it is im-
portant to maintain the parasitic capacitance of the connec-
tion between this series resistance and the channel input
pin as low as possible; therefore, the resistor should be
located as close as practical to the channel input pin. The
effect of the series resistance on the converter accuracy can
be evaluated from the curves presented in the Analog In-
put/Reference Current section. In addition, a series resis-
tor will introduce a temperature dependent offset error due
to the input leakage current. A 1nA input leakage current
will develop a 1ppm offset error on a 5k resistor if V
REF
=
5V. This error has a very strong temperature dependency.
Output Data Format
The LTC2404/LTC2408 serial output data stream is 32 bits
long. The first 4 bits represent status information indicat-
ing the sign, input range and conversion state. The next 24
bits are the conversion result, MSB first. The remaining 4
bits are sub LSBs beyond the 24-bit level that may be in-
cluded in averaging or discarded without loss of resolution.
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