LTC1863L/LTC1867L
5
For more information www.linear.com/LTC1863L
1863l7lfe
TYPICAL PERFORMANCE CHARACTERISTICS
TIMING CHARACTERISTICS
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 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 V
DD
.
Note 5: V
DD
= 2.7V, f
SAMPLE
= 175ksps and f
SCK
= 20MHz at 25°C,
t
r
= t
f
= 5ns and V
IN
–
= 1.25V for bipolar mode unless otherwise specified.
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 V
IN
–
= 1.25V. For unipolar
mode, common mode input range is 0V to V
DD
for the positive input and
0V to 1.5V for the negative input. For bipolar mode, common mode input
range is 0V to V
DD
for both positive and negative inputs.
Note 10: Guaranteed by design, not subject to test.
Note 11: t
2
of 47ns maximum allows f
SCK
up to 10MHz for rising capture
with 50% duty cycle and f
SCK
up to 20MHz for falling capture (with 3ns
setup time for the receiving logic).
(LTC1867L)
OUTPUT CODE
0
INL (LSB)
0
0.5
1.0
65536
1863L7L G01
–0.5
–1.0
–2.0
16384
32768
49152
–1.5
2.0
1.5
V
DD
= 2.7V
f
SAMPLE
= 175ksps
OUTPUT CODE
0
DNL (LSB)
0
0.5
1.0
65536
1863L7L G02
–0.5
–1.0
–2.0
16384
32768
49152
–1.5
2.0
1.5
V
DD
= 2.7V
f
SAMPLE
= 175ksps
FREQUENCY (kHz)
0
–60
–40
0
65.625
1863L7L G03
–80
–100
21.875 43.75 87.5
–120
–140
–20
AMPLITUDE (dB)
f
SAMPLE
= 175ksps
f
IN
= 1kHz
SNR = 82.9dB
SINAD = 81.4dB
THD = 86.8dB
Integral Nonlinearity
vs Output Code
Differential Nonlinearity
vs Output Code
4096 Points FFT Plot
(V
DD
= 2.7V, Internal REF)
FREQUENCY (kHz)
0
–60
–40
0
65.625
1863L7L G04
–80
–100
21.875 43.75 87.5
–120
–140
–20
AMPLITUDE (dB)
f
SAMPLE
= 175ksps
f
IN
= 1kHz
SNR = 84.7dB
SINAD = 83.5dB
THD = 90dB
ACTIVE CHANNEL INPUT FREQUENCY (kHz)
–120
RESULTING AMPLITUDE ON
SELECTED CHANNEL (dB)
–100
–90
–70
–60
0.1 10 100 1000
1863L7L G05
–140
1
–80
–110
–130
V
DD
= 3V
f
SAMPLE
= 175ksps
ADJACENT PAIR
NONADJACENT
PAIR
INPUT FREQUENCY (kHz)
1
20
AMPLITUDE (dB)
40
60
100
10 100
1863L7L G06
80
30
50
90
70
V
DD
= 3V
INTERNAL REF
f
SAMPLE
= 175ksps
SNR
SINAD
4096 Points FFT Plot
(V
DD
= 3V, REFCOMP = Ext 3V) Crosstalk vs Input Frequency
Signal-to-(Noise + Distortion)
Ratio vs Input Frequency
