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LTC2622 数据表(PDF) 14 Page - Linear Technology

部件名 LTC2622
功能描述  Dual, 16-Bit, 5Msps Differential Input ADC with Wide Input Common Mode Range
Download  26 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC2622 数据表(HTML) 14 Page - Linear Technology

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LTC2323-16
14
232316fc
For more information www.linear.com/LTC2323-16
APPLICATIONS INFORMATION
Single-Ended-to-Differential Conversion
While single-ended signals can be directly digitized as
previously discussed, single-ended to differential conver-
sion circuits may also be used when higher dynamic range
is desired. By producing a differential signal at the inputs
of the LTC2323-16, the signal swing presented to the ADC
is maximized, thus increasing the achievable SNR.
The LT®1819 high speed dual operational amplifier is
recommended for performing single-ended-to-differen-
tial conversions, as shown in Figure 8. In this case, the
first amplifier is configured as a unity-gain buffer and the
single-ended input signal directly drives the high imped-
ance input of this amplifier.
Fully-Differential Inputs
ToachievethefulldistortionperformanceoftheLTC2323-16,
a low distortion fully-differential signal source driven
through the LT1819 configured as two unity-gain buffers,
as shown in Figure 9, can be used. This circuit achieves
the full data sheet THD specification of –85dB at input
frequencies of 500kHz and less. Data sheet typical perfor-
mance curves taken at higher frequencies used a harmonic
rejection filter between the ADC and the signal source to
eliminate the op amp as the dominant source of distortion.
The fully-differential configuration yields an analog input
span (AIN+ – AIN–) of ±REFOUT1,2. In this configuration,
the input signal is driven on each AIN pin, typically at
equal spans but opposite polarity. This yields a high com-
mon mode rejection on the input signals. The common
mode voltage of the analog input can be anywhere within
the VDD input range, but will be limited by the peak swing
of the full-range input signal. For example, if the internal
reference is used with VDD = 5VDC, the full-range input
span will be ±4.096V. Half of the input span is typically
driven on each AIN pin, yielding a signal span for each
AIN pin of 4.096VP-P. This leaves ~0.9V of common mode
variation tolerance. When using external references, it is
possible to increase common mode tolerance by com-
pressing the ADC full-range codes into a tighter range.
For example, using an external 2.048V reference with VDD
= 5V the total span would be ±2.048V and each AIN span
would be limited to 2.048VP-P allowing a common mode
range of ~3V. Compressing the input span would incur a
SNR penalty of approximately 2dB. Input span compres-
sion may be useful if single-supply analog input drivers
Figure 8. Single-Ended to Differential Driver
Figure 9. LT1819 Buffering a Fully-Differential Signal Source
VREF
0V
VREF
0V
VREF
0V
VREF/2
+
+
200
200
LT1819
232316 F08
VREF
0V
VREF
0V
VREF
0V
VREF
0V
+
+
LT1819
232316 F09


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