參數(shù)資料
型號(hào)： LTC2435IGN
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 20-Bit No Latency ADCs with Differential Input and Differential Reference
中文描述： 1-CH 20-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16
封裝： 0.150 INCH, PLASTIC, SSOP-16
文件頁(yè)數(shù)： 12/40頁(yè)
文件大?。?/td> 463K
代理商： LTC2435IGN
LTC2435/LTC2435-1
12
24351fa
APPLICATIU
CONVERTER OPERATION
W
U
U
Figure 2. LTC2435 State Transition Diagram
Converter Operation Cycle
The LTC2435/LTC2435-1 are low power, delta-sigma ana-
log-to-digital converters with an easy to use 3-wire serial
interface (see Figure 1). Their operation is made up of
three states. The converter operating cycle begins with the
conversion, followed by the sleep state and ends with the
data output (see Figure 2). The 3-wire interface consists of
serial data output (SDO), serial clock (SCK) and chip select
(CS).
There is no latency in the conversion result. The data
output corresponds to the conversion just performed.
This result is shifted out on the serial data out pin (SDO)
under the control of the serial clock (SCK). Data is updated
on the falling edge of SCK allowing the user to reliably latch
data on the rising edge of SCK (see Figure 3). The data
output state is concluded once 24 bits are read out of the
ADC or when CS is brought HIGH. The device automati-
cally initiates a new conversion and the cycle repeats.
Through timing control of the CS and SCK pins, the
LTC2435/LTC2435-1 offer several flexible modes of op-
eration (internal or external SCK and free-running conver-
sion modes). These various modes do not require pro-
gramming configuration registers; moreover, they do not
disturb the cyclic operation described above. These modes
of operation are described in detail in the Serial Interface
Timing Modes section.
Conversion Clock
A major advantage the delta-sigma converter offers over
conventional type converters is an on-chip digital filter
(commonly implemented as a Sinc or Comb filter). For
high resolution, low frequency applications, this filter is
typically designed to reject line frequencies of 50Hz or
60Hz plus their harmonics. The filter rejection perfor-
mance is directly related to the accuracy of the converter
system clock. The LTC2435/LTC2435-1 incorporate a
highly accurate on-chip oscillator. This eliminates the
need for external frequency setting components such as
crystals or oscillators. Clocked by the on-chip oscillator,
the LTC2435 achieves a minimum of 110dB rejection at
the line frequency (50Hz or 60Hz
±
2%), while the
LTC2435-1 achieves a minimum of 87db rejection at 50Hz
±
2% and 60Hz
±
2% simultaneously.
Ease of Use
The
LTC2435/LTC2435-1
data output has no latency,
filter settling delay or redundant data associated with the
conversion cycle. There is a one-to-one correspondence
between the conversion and the output data. Therefore,
multiplexing multiple analog voltages is easy.
Initially, the LTC2435/LTC2435-1 perform a conversion.
Once the conversion is complete, the device enters the
sleep state. While in this sleep state, power consumption
is reduced by an order of magnitude if CS is HIGH. The part
remains in the sleep state as long as CS is HIGH. The
conversion result is held indefinitely in a static shift
register while the converter is in the sleep state.
Once CS is pulled LOW, the device exits the low power
sleep mode and enters the data output state. If CS is pulled
HIGH before the first rising edge of SCK, the device returns
to the sleep mode and the conversion result is still held in
the internal static shift register. If CS remains LOW after
the first rising edge of SCK, the device begins outputting
the conversion result. Taking CS HIGH at this point will
terminate the data output state and start a new conversion.
CONVERT
SLEEP
DATA OUTPUT
2435 F02
TRUE
FALSE CS = LOW
AND
SCK
相關(guān)PDF資料
PDF描述
LTC2435-1IGN 20-Bit No Latency ADCs with Differential Input and Differential Reference
LTC2435 20-Bit No Latency ADCs with Differential Input and Differential Reference
LTC2435-1 20-Bit No Latency ADCs with Differential Input and Differential Reference
LTC2435-1CGN 20-Bit No Latency ADCs with Differential Input and Differential Reference
LTC2435CGN 20-Bit No Latency ADCs with Differential Input and Differential Reference
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