參數(shù)資料
型號(hào)： AD7690
廠商： Analog Devices, Inc.
英文描述： 16-Bit, +/-0.65 LSB INL, 500 kSPS PulSAR Differential ADC in MSOP/QFN
中文描述： 16位/ -0.65 LSB INL和500 kSPS的PulSAR系列差分ADC，采用MSOP / QFN封裝
文件頁(yè)數(shù)： 16/24頁(yè)
文件大小： 449K
代理商： AD7690
AD7693
Preliminary Technical Data
SUPPLYING THE ADC FROM THE REFERENCE
For simplified applications, the AD7693, with its low operating
current, can be supplied directly using the reference circuit
shown in Figure 32. The reference line can be driven by
Rev. PrB | Page 16 of 24
ADSP-219x. In this mode, the AD7693 can use either a 3-wire
or 4-wire interface. A 3-wire interface using the CNV, SCK, and
SDO signals minimizes wiring connections useful, for instance,
in isolated applications. A 4-wire interface using the SDI, CNV,
SCK, and SDO signals allows CNV, which initiates the
conversions, to be independent of the readback timing (SDI).
This is useful in low jitter sampling or simultaneous sampling
applications.
The system power supply directly.
A reference voltage with enough current output capability,
such as the
ADR43x
.
When in chain mode, the AD7693 provides a daisy-chain
feature using the SDI input for cascading multiple ADCs on a
single data line similar to a shift register.
A reference buffer, such as the
AD8031
, which can also
filter the system power supply, as shown in Figure 32.
AD8031
AD7693
VIO
REF
VDD
10μF
1μF
10
10k
5V
5V
5V
1μF
1
-
1
OPTIONAL REFERENCE BUFFER AND FILTER.
Figure 32. Example of Application Circuit
The mode in which the part operates depends on the SDI level
when the CNV rising edge occurs. The CS mode is selected if
SDI is high, and the chain mode is selected if SDI is low. The
SDI hold time is such that when SDI and CNV are connected
together, the chain mode is selected.
In either mode, the AD7693 offers the option of forcing a start
bit in front of the data bits. This start bit can be used as a busy
signal indicator to interrupt the digital host and trigger the data
reading. Otherwise, without a busy indicator, the user must
timeout the maximum conversion time prior to readback.
DIGITAL INTERFACE
Though the AD7693 has a reduced number of pins, it offers
flexibility in its serial interface modes.
The busy indicator feature is enabled
In the CS mode if CNV or SDI is low when the ADC
conversion ends (see Figure 36 and Figure 40).
In the chain mode if SCK is high during the CNV rising
edge (see Figure 44).
CS
When in
digital hosts, and DSPs, for example, Blackfin ADSP-BF53x or
mode, the AD7693 is compatible with SPI, QSPI,
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AD7693 16-Bit, +/-0.65 LSB INL, 500 kSPS PulSAR Differential ADC in MSOP/QFN
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