MAX110/MAX111
Low-Cost, 2-Channel, ±14-Bit Serial ADCs
6 _______________________________________________________________________________________
Note 10: Timing specifications are guaranteed by design. All input control signals are specified with t
r
= t
f
= 5ns
(10% to 90% of +5V) and timed from a +1.6V voltage level.
Note 1: These specifications apply after auto-null and gain calibration. Performance at power-supply tolerance limits is guaranteed
by power-supply rejection tests. Tests are performed at V
DD
= 5V and V
SS
= -5V (MAX110).
Note 2: 32,768 LSBs cover an input voltage range of ±V
REF
(15 bits). An additional bit (OFL) is set for V
IN
> V
REF
.
Note 3: Guaranteed by design. Not subject to production testing.
Note 4: DNL is less than ±2 counts (LSBs) out of 2
15
counts (±14 bits). The major source of DNL is noise, and this can be further
improved by averaging.
Note 5: See
3-Step Calibration
section in text.
Note 6: V
REF
= (V
REF+
- V
REF-
), V
IN
= (V
IN1+
- V
IN1-
) or (V
IN2+
- V
IN2-
). The voltage is interpreted as negative when the voltage at
the negative input terminal exceeds the voltage at the positive input terminal.
Note 7: Conversion time is set by control bits CONV1–CONV4.
Note 8: Tested at clock frequency of 1MHz with the divide-by-2 mode (i.e. oversampling clock of 500kHz). See
Typical Operating
Characteristics
section for the effect of other clock frequencies. Also read the
Clock Frequency
section.
Note 9: This current depends strongly on C
XCLK
(see
Applications Information
section).
TIMING CHARACTERISTICS (see Figure 6)
(V
DD
= 5V, V
SS
= -5V (MAX110), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
MHz
1.1 3.0MAX11_ BM
RC Oscillator Frequency
1.3 2.8MAX11_ _C/E
2.0T
A
= +25°C
PARAMETER SYMBOL MIN TYP MAX UNITS
80
60
CS to SCLK Hold Time
(Note 10)
t
CSH
0 ns
DIN to SCLK Setup Time
(Note 10)
t
DS
100
ns
DIN to SCLK Hold Time
(Note 10)
t
DH
0 ns
100
60
80
CS to SCLK Setup Time
(Note 10)
t
CSS
100
ns
120
SCLK, XCLK Pulse Width
(Note 10)
t
CK
160
ns
03580
0 100
Data Access Time
(Note 10)
t
DA
0 120
ns
0 60 100
0 120
SCLK to DOUT Valid
Delay (Note 10)
t
DO
0 140
ns
35 80
Bus Relinquish Time
(Note 10)
t
DH
120
ns
MAX11_ BM
MAX11_ _C/E
T
A
= +25°C
MAX11_ BM
MAX11_ _C/E
CONDITIONS
MAX11_ _C/E
MAX11_ _C/E
MAX11_ BM
T
A
= +25°C
MAX11_ BM
T
A
= +25°C
C
LOAD
= 50pF
T
A
= +25°C
C
LOAD
= 50pF
MAX11_ _C/E
T
A
= +25°C
MAX11_ BM
T
A
= +25°C
MAX11_ _C/E/M
