LTC1867LACGN Просмотр технического описания (PDF) - Linear Technology
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LTC1867LACGN Datasheet PDF : 16 Pages
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LTC1863L/LTC1867L
TIMING CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. (Note 5)
Note 4: When these pin voltages are taken below GND, they will be
clamped by internal diodes. This product can handle input currents up to
100mA below GND without latchup. These pins are not clamped to VDD.
Note 5:
tr = tf =
VDD
5ns
a=n2d.7VVIN,–fS=AM1.P2L5EV=fo1r75bkipsoplsaranmdofdSeCKun=le2s0sMoHthzeartw2is5e°Cs,pecified.
Note 6: Linearity, offset and gain error specifications apply for both
unipolar and bipolar modes. The INL and DNL are tested in bipolar mode.
Note 7: Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve.
The deviation is measured from the center of the quantization band.
Note 8: Unipolar offset is the offset voltage measured from +1/2LSB
when the output code flickers between 0000 0000 0000 0000 and
0000 0000 0000 0001 for LTC1867L and between 0000 0000 0000
and 0000 0000 0001 for LTC1863L. Bipolar offset is the offset voltage
measured from –1/2LSB when output code flickers between 0000 0000
0000 0000 and 1111 1111 1111 1111 for LTC1867L, and between
0000 0000 0000 and 1111 1111 1111 for LTC1863L.
Note 9: Recommended operating conditions. The input range of ±1.25V
for bipolar mode is measured with respect to VIN– = 1.25V. For unipolar
mode, common mode input range is 0V to VDD for the positive input and
0V to 1.5V for the negative input. For bipolar mode, common mode input
range is 0V to VDD for both positive and negative inputs.
Note 10: Guaranteed by design, not subject to test.
Note 11: t2 of 47ns maximum allows fSCK up to 10MHz for rising capture
with 50% duty cycle and fSCK up to 20MHz for falling capture (with 3ns
setup time for the receiving logic).
TYPICAL PERFORMANCE CHARACTERISTICS
(LTC1867L)
Integral Nonlinearity
vs Output Code
Differential Nonlinearity
vs Output Code
2.0
VDD = 2.7V
1.5 fSAMPLE = 175ksps
2.0
VDD = 2.7V
1.5 fSAMPLE = 175ksps
1.0
1.0
0.5
0.5
0
0
–0.5
–0.5
–1.0
–1.0
–1.5
–1.5
–2.0
0
16384 32768 49152
OUTPUT CODE
65536
1863L7L G01
–2.0
0
16384 32768 49152
OUTPUT CODE
65536
1863L7L G02
4096 Points FFT Plot
(VDD = 3V, REFCOMP = Ext 3V)
0
fSAMPLE = 175ksps
–20
fIN = 1kHz
SNR = 84.7dB
SINAD = 83.5dB
–40
THD = 90dB
–60
–80
–100
–120
Crosstalk vs Input Frequency
–60
VDD = 3V
–70 fSAMPLE = 175ksps
–80
–90
–100
–110
ADJACENT PAIR
–120
–130
NONADJACENT
PAIR
–140
0
21.875 43.75 65.625 87.5
FREQUENCY (kHz)
1863L7L G04
–140
0.1
1
10
100
1000
ACTIVE CHANNEL INPUT FREQUENCY (kHz)
1863L7L G05
For more information www.linear.com/LTC1863L
4096 Points FFT Plot
(VDD = 2.7V, Internal REF)
0
fSAMPLE = 175ksps
–20
fIN = 1kHz
SNR = 82.9dB
SINAD = 81.4dB
–40
THD = 86.8dB
–60
–80
–100
–120
–140
0
21.875 43.75 65.625 87.5
FREQUENCY (kHz)
1863L7L G03
Signal-to-(Noise + Distortion)
Ratio vs Input Frequency
100
90
SNR
80
70
SINAD
60
50
40
VDD = 3V
30 INTERNAL REF
fSAMPLE = 175ksps
20
1
10
100
INPUT FREQUENCY (kHz)
1863L7L G06
1863l7lfd
5
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