Datasheet

MAX1020/MAX1022/MAX1057/MAX1058
10-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
_______________________________________________________________________________________ 7
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
DVDD
= 2.7V to 3.6V (MAX1057), external reference V
REF
= 2.5V (MAX1057), V
AVDD
= V
DVDD
= 4.75V to 5.25V
(MAX1020/MAX1022/MAX1058), external reference V
REF
= 4.096V (MAX1020/MAX1022/MAX1058), f
CLK
= 3.6MHz (50% duty cycle),
T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
AVDD
= V
DVDD
= 3V (MAX1057), V
AVDD
= V
DVDD
= 5V
(MAX1020/MAX1022/MAX1058), T
A
= +25°C. Outputs are unloaded, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX1057, V
AVDD
= 2.7V to
±0.06 ±0.5
ADC Positive-Supply Rejection PSRA
Full-
scale
input
M AX 1020/M AX 1022/M AX 1058,
V
AVDD
= 4.75V to 5.25V
±0.06 ±0.5
mV
TIMING CHARACTERISTICS (Figures 6–13)
SCLK Clock Period t
CP
40 ns
SCLK Pulse-Width High t
CH
40/60 duty cycle 16 ns
SCLK Pulse-Width Low t
CL
60/40 duty cycle 16 ns
GPIO Output Rise/Fall After
CS Rise
t
GOD
C
LOAD
= 20pF 100 ns
GPIO Input Setup Before CS Fall t
GSU
0ns
LDAC Pulse Width t
LDACPWL
20 ns
C
LOAD
= 20pF, SLOW = 0 1.8 12.0
SCLK Fall to DOUT Transition
(Note 16)
t
DOT
C
LOAD
= 20pF, SLOW = 1 10 40
ns
C
LOAD
= 20pF, SLOW = 0 1.8 12.0
SCLK Rise to DOUT Transition
(Notes 16, 17)
t
DOT
C
LOAD
= 20pF, SLOW = 1 10 40
ns
CS Fall to SCLK Fall Setup Time t
CSS
10 ns
S C LK Fal l to CS Ri se S etup Ti m et
CSH
0ns
DIN to SCLK Fall Setup Time t
DS
10 ns
DIN to SCLK Fall Hold Time t
DH
0 2000 ns
CS Pulse-Width High t
CSPWH
50 ns
CS Rise to DOUT Disable t
DOD
C
LOAD
= 20pF 25 ns
CS Fall to DOUT Enable t
DOE
C
LOAD
= 20pF 1.5 25.0 ns
EOC Fall to CS Fall t
RDS
30 ns
CKSEL = 01 (temp sense) or CKSEL =
10 (temp sense), internal reference on
65
CKSEL = 01 (temp sense) or CKSEL =
10 (temp sense), internal reference
initially off
140
CKSEL = 01 (voltage conversion) 9
CKSEL = 10 (voltage conversion),
internal reference on
9
CS or CNVST Rise to EOC
Fall—Internally Clocked
Conversion Time
t
DOV
CKSEL = 10 (voltage conversion),
internal reference initially off
80
µs
CKSEL = 00, CKSEL = 01 (temp sense) 40 ns
CNVST Pulse Width t
CSW
CKSEL = 01 (voltage conversion) 1.4 µs