LTC1852/LTC1853
6
18523fa
TIMING CHARACTERISTICS The ● denotes the specications which apply over the full operating temperature
range, otherwise specications are at TA = 25°C. (Note 5)
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All voltage values are with respect to ground with OGND and GND
wired together unless otherwise noted.
Note 3: When these pin voltages are taken below ground or above VDD,
they will be clamped by internal diodes. This product can handle input
currents of 100mA below ground or above VDD without latchup.
Note 4: When these pin voltages are taken below ground, they will be
clamped by internal diodes. This product can handle input currents of
100mA below ground without latchup. These pins are not clamped to VDD.
Note 5: VDD = 5V, fSAMPLE = 400kHz, tr = tf = 2ns unless otherwise
specied.
Note 6: Linearity, offset and full-scale specications apply for a single-
ended input on any channel with COM grounded.
Note 7: Integral nonlinearity is dened as the deviation of a code from a
straight line passing through the actual end points of the transfer curve.
The deviation is measured from the center of the quantization band.
Note 8: Bipolar offset is the offset voltage measured from – 0.5LSB when
the output code ickers between 1111 1111 1111 and 0000 0000 0000.
For the LTC1853 and between 11 1111 1111 and 00 0000 0000 for the
LTC1852.
Note 9: Guaranteed by design, not subject to test.
Note 10: Recommended operating conditions.
Note 11: The falling CONVST edge starts a conversion. If CONVST returns
high at a critical point during the conversion it can create small errors.
For the best results, ensure that CONVST returns high either within 400ns
after the start of the conversion or after BUSY rises.
Note 12: The analog input range is determined by the voltage on
REFCOMP. The gain error specication is tested with an external 4.096V
but is valid for any value of REFCOMP greater than 2V and less than
(VDD – 0.5V.)
Note 13: MUX address is updated immediately after BUSY falls.
1.0
0.5
0
–0.5
–1.0
0
4096
CODE
DNL
ERROR
(LBS)
1852 F02
0
–20
–40
–60
–80
–100
–120
0
200
FREQUENCY (kHz)
AMPLITUDE
(dB)
1852 F03
Differential Linearity
8192 Point FFT with
fIN = 39.599kHz
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
t13
CONVST High Time
(Note 10)
●
50
ns
t14
Latch Setup Time
(Note 10)
●
10
ns
t15
Latch Hold Time
(Notes 9, 10)
●
10
ns
t16
WR Low Time
(Note 10)
●
50
ns
t17
WR High Time
(Note 10)
●
50
ns
t18
M1 to M0 Setup Time
(Notes 9, 10)
●
10
ns
t19
M0 to BUSY Delay
M1 High
20
ns
t20
M0 to WR (or RD) Setup Time
(Notes 9, 10)
●
t19
ns
t21
M0 High Pulse Width
(Note 10)
●
50
ns
t22
RD High Time Between Readback Reads
(Note 10)
●
50
ns
t23
Last WR (or RD) to M0
(Note 10)
●
10
ns
t24
M0 to RD Setup Time
(Notes 9, 10)
●
t19
ns
t25
M0 to CONVST
(Note 10)
●
t19
ns
t26
Aperture Delay
– 0.5
ns
t27
Aperture Jitter
2psRMS
TYPICAL PERFORMANCE CHARACTERISTICS