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LTC2327-18 数据表(PDF) 14 Page - Linear Technology

部件名 LTC2327-18
功能描述  True Bipolar, Pseudo-Differential Input ADC with 95dB SNR
Download  26 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC2327-18 数据表(HTML) 14 Page - Linear Technology

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LTC2327-18
14
232718fa
For more information www.linear.com/LTC2327-18
applicaTions inForMaTion
Figure 5b. Using the LTC6655-2.048 as an External Reference
Figure 5c. Overdriving REFBUF Using the LTC6655-5
Figure 6. CNV waveform Showing Burst Sampling
LTC2327-18
BANDGAP
REFERENCE
LTC6655-2.048
232718 F05b
47µF
2.7µF
6.5k
REFBUF
REFIN
15k
6.5k
REFERENCE
BUFFER
GND
LTC2327-18
GND
BANDGAP
REFERENCE
LTC6655-5
232718 F05c
47µF
6.5k
REFBUF
REFIN
15k
6.5k
REFERENCE
BUFFER
CNV
IDLE
PERIOD
IDLE
PERIOD
232718 F06
of the output code. If an external reference is used to
overdrive REFBUF, the fast settling LTC6655-5 reference
is recommended.
Internal Reference Buffer Transient Response
Foroptimumtransientperformance,theinternalreference
buffer should be used. The internal reference buffer uses a
proprietary design that results in an output voltage change
at REFBUF of less than 1LSB when responding to a sudden
burst of conversions. This makes the internal reference
bufferoftheLTC2327-18trulysingle-shotcapablesincethe
first sample taken after idling will yield the same result as
a sample taken after the transient response of the internal
reference buffer has settled. Figure 7 shows the transient
responses of the LTC2327-18 with the internal reference
buffer and with the internal reference buffer overdriven by
the LTC6655-5, both with a bypass capacitance of 47μF.
rate and output code. In applications where a burst of
samples is taken after idling for long periods, as shown in
Figure 6, IREFBUF quickly goes from approximately 390µA
to a maximum of 0.7mA for REFBUF = 5V at 500ksps. This
step in DC current draw triggers a transient response in
the external reference that must be considered since any
deviation in the voltage at REFBUF will affect the accuracy
TIME (µs)
2
0
–2
–4
232718 F07
–8
–6
0
900
800
700
600
500
400
300
200
100
1000
INTERNAL REFERENCE BUFFER
EXTERNAL SOURCE ON REFBUF
Figure 7. Transient Response of the LTC2327-18


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